A complete set of equipment and construction method for updating the original well of small-diameter rainwater and sewage pipelines

Abstract

The present invention discloses a complete set of equipment and a construction method for a small-diameter rainwater and sewage pipeline original well renewal drilling rig, belonging to the technical field of in-situ renewal construction of rainwater and sewage pipelines. The equipment includes a micro-pull-top drilling rig, which includes a base assembly, a bracket assembly, a power assembly, and a guide drill rod. The base assembly is horizontally arranged, the bracket assembly is connected to the base assembly, the power assembly is arranged on the bracket assembly, and the guide drill rod is connected to the power assembly; the base assembly is provided with four vertically arranged side fixing seat assemblies; the front of the guide drill rod is provided with a detachable guide drill bit, and the front of the guide drill bit is provided with a pipeline renewal device. The present invention can enter a smaller working well for construction, solving the problem that ordinary construction equipment cannot perform rotary cutting and crushing construction in the original working well during construction, ensuring that the replacement of old underground pipelines with new pipes meets design requirements, while ensuring smooth pipeline construction and significantly reducing labor costs during construction.

Description

Technical Field

[0001] The invention belongs to the technical field of in-situ renewal construction of rainwater and sewage pipelines, and in particular relates to a complete set of drilling rigs for in-situ renewal of small-diameter rainwater and sewage pipelines and a construction method. Background Art

[0002] Underground pipelines are an important part of urban infrastructure. With the rapid development of my country's economy, the urbanization process has accelerated, and the scale of cities has gradually expanded. The huge and complex municipal drainage pipeline network, as an indispensable part of modern cities, shoulders the important task of transmitting and transporting rainwater and sewage throughout the city day and night.

[0003] In the daily construction and maintenance of municipal pipeline networks, the common method of excavation followed by re-burying was used to construct and update municipal pipelines. This resulted in frequent "rips" on urban roads, seriously impacting urban traffic and the lives of surrounding residents. With the advancement of urbanization, urban underground pipelines have become increasingly complex, and the load on urban roads has become increasingly severe. This has led to structural defects such as cracks, deformations, misalignments, and disconnections in drainage pipes, seriously affecting the structural safety of the pipes, leading to holes in weak points in the pipes and road collapses. If left unrepaired for a long time, soil in the pipe holes is easily lost, leading to safety hazards such as ground subsidence, cracks, and sudden collapses. At the very least, this can pollute groundwater and seriously affect the pipe's water flow capacity. At worst, it can cause sewage to overflow from working wells, affecting the city's appearance and the surrounding environment, causing waterlogging during heavy rains, and even paralyzing traffic.

[0004] With the advancement of urbanization and the popularization of municipal pipe networks, the difficulty of open-cut pipeline construction has increased, bringing greater challenges to construction. Finding fast and effective construction equipment and construction technology is the key to solving the problem. For the in-situ replacement of small-diameter rainwater and sewage pipes under φ500mm, it is necessary to replace the new pipe without destroying the original working well. Currently, the following construction methods are generally used:

[0005] 1. Trenchless steel ring repair process

[0006] ① The trenchless steel ring repair process is less affected by the environment. It uses the original working well for operation and only needs to close the corresponding material and equipment storage locations. Taking the repair of DN400 pipeline as an example, it is necessary to manually go down the well to dig out the soil around the original old pipeline, put on the DN800 steel ring, and push it in section by section. This has a certain impact on the surrounding pipelines, and manual excavation poses a safety hazard.

[0007] ② The trenchless steel ring repair process does not involve road excavation and has no impact on the appearance of the road surface. In terms of construction period, the trenchless steel ring repair process requires a longer construction period. Taking 100 meters as an example, because it is manual excavation and the working space is limited, the construction period takes 60 days.

[0008] ③ The trenchless steel ring repair process requires chemical grouting soil solidification + DN800 steel ring sheathing, laying DN400 double-wall corrugated pipe and filling the gaps, and finally pulling in CIPP ultraviolet light curing, which has a high project cost.

[0009] 2. Short pipe lining method

[0010] ① The short pipe lining repair process is less affected by the environment. It uses the original working well for operation and only needs to close the corresponding material and equipment stacking locations. Taking the repair of DN400 pipeline as an example, a push device is set up in the well manually to push in the small-diameter pipeline. The short pipe is generally one level smaller than the original pipeline diameter, and its service life is similar to that of the original pipeline, but the cross-sectional loss is large, and debris is easily deposited at the interface, which will affect its use over time.

[0011] ② The short tube lining method of repair does not require road excavation and has no impact on the appearance of the road surface. In terms of construction period, the short tube lining method of repair requires a shorter construction period.

[0012] ③ The short pipe lining method requires chemical grouting to solidify the soil, including pipeline inspection and dredging, laying of a smaller diameter HDPE pipe, and injecting cement slurry to fill the gaps between the new and old pipes.

[0013] 3. Horizontal Directional Drilling Tube Drag Method

[0014] ① The process of using a horizontal directional drilling rig to drag and replace the new pipe has a certain impact on the environment. It requires digging a working pit and corresponding space for stacking materials, which has a significant impact on road traffic. This process is constructed along the route of the old pipeline and will not affect adjacent pipelines.

[0015] ② A bevel section is required, which places high demands on the site. The drilled holes in the bevel section need to be grout-filled. In terms of construction time, trenchless repair requires a shorter construction period.

[0016] ③Non-excavation in-situ replacement repair process with new pipes of the same diameter, including pipeline inspection and dredging, has a general project cost.

[0017] 4. Fragmented tube method

[0018] The pipe-breaking method is a pipeline renewal technology that uses pipe-breaking equipment to cut the original pipe from the inside, then uses an expansion head to expand it, squeeze the original pipe fragments into the surrounding soil to form a pipe hole, and simultaneously pull in the new pipe.

[0019] This process requires only partial excavation of the working surface, has minimal traffic impact, and is fast to construct. It reduces the inconvenience and other issues associated with municipal construction, and while completing the project quickly, it also reduces the impact on nearby residents. However, it has the following drawbacks:

[0020] ① The success rate of construction is low, generally around 50%. Once construction fails, remedial measures such as opening a skylight must be taken, which has a significant impact on traffic and the surrounding environment;

[0021] ②The vibration generated during the pipe cracking process may affect surrounding facilities;

[0022] ③ Expansive soil may cause construction difficulties and road surface arching.

[0023] Therefore, it is necessary to provide a complete set of equipment and construction method for updating the original well drilling rig of small-diameter rainwater and sewage pipes for use in the daily construction and operation and maintenance of underground pipe networks. Summary of the Invention

[0024] The embodiment of the present invention provides a complete set of drilling equipment and a construction method for updating an original well of a small-diameter rainwater and sewage pipeline, so as to solve the problems in the prior art.

[0025] The embodiment of the present invention adopts the following technical solution: a complete set of drilling equipment for updating the original well of small-diameter rainwater and sewage pipes, including a micro-pull top drilling rig, the micro-pull top drilling rig including a base assembly, a bracket assembly, a power assembly and a guide drill rod,

[0026] The base assembly is arranged horizontally, the bracket assembly is connected to the base assembly, the power assembly is connected to the bracket assembly, the bracket assembly can drive the power assembly to move horizontally, the guide drill rod is connected to the power assembly, and the power assembly drives the guide drill rod to rotate;

[0027] The base assembly is provided with four vertically arranged side fixing seat assemblies;

[0028] The front part of the guide drill rod is provided with a detachable guide drill bit, and the front part of the guide drill bit is provided with a pipeline renewal device.

[0029] Furthermore, the bracket assembly includes two track shafts detachably mounted on the base assembly and a push-pull cylinder disposed at the center of the base assembly;

[0030] The two rail shafts are provided with slidingly connected brackets, and the telescopic ends of the push-pull cylinders are connected to the brackets;

[0031] The bracket is provided with a detachable connecting seat, the connecting seat is provided with a pin, and the power assembly is fixed to the connecting seat via the pin;

[0032] The base assembly is provided with front and rear tightening screws.

[0033] Furthermore, the power assembly includes a gearbox, a power head, two front-end motors and two rear-end motors symmetrically arranged on the gearbox;

[0034] The guide drill rod is arranged on the power head, and the guide drill rod is driven to rotate by two front-end motors and two rear-end motors.

[0035] Furthermore, the gear box is also provided with a rotary control valve, a push-pull control valve, a two-speed valve group assembly and a pressure reducing valve group assembly which are connected to the hydraulic pipes of the front motor and the rear motor.

[0036] Furthermore, a water shaft assembly is provided on the gear box on the other side of the guide drill rod.

[0037] Furthermore, the pipeline renewal device includes an octagonal sleeve rod, a compound rotary cutting and crushing reamer, a female buckle pull box, a concave and convex shaft, a pressing plate and a pipe loading cylinder;

[0038] The octagonal sleeve rod is connected to the guide drill bit, and the composite rotary cutting, crushing and reaming device is connected to the octagonal sleeve rod;

[0039] The compound rotary cutting, crushing and reaming device is equipped with a distributor and a tube pulling head, and the pulling head on the tube pulling head is connected to the female buckle pull box;

[0040] The female buckle pull box is connected to the concave-convex shaft, and the pipe loading cylinder is connected to the pressing plate.

[0041] Furthermore, left and right tightening screws are installed on the side fixing seat assembly.

[0042] A construction method for a complete set of drilling equipment for updating an existing well of a small-diameter rainwater and sewage pipeline comprises the following steps:

[0043] S1: Widening of the working pit: widen the bottom of the working pit to a diameter of 1200mm and reinforce it;

[0044] S2: Installation and adjustment of the base assembly; hoist the base assembly and bracket connector into the working pit, adjust the elevation, direction and slope of the base assembly and bracket connector according to the original old pipeline trajectory, adjust the front and rear tightening screws to fix the base assembly, and fix the base assembly and bracket connector;

[0045] S3: Install the side fixing seat assembly; hoist the four side fixing seat assemblies into the working pit, connect the side fixing seat assembly to the base assembly with bolts and lock them in place, rotate the screws on the side fixing seat assembly to further secure the base assembly;

[0046] S4: Install the power head assembly; hoist the power head assembly including the rear motor into the working well, connect the power head assembly to the bracket assembly with a pin and tighten with a round nut;

[0047] S5: Front-end motor installation: hoist the front-end motor into the working well and install it into the power head assembly;

[0048] S6: Connect the hydraulic pipes between the drilling rig and the hydraulic station; connect the hydraulic pipes between the motor and the two-speed valve assembly, and connect the hydraulic pipes and water pipes between the micro-pull top drilling rig and the hydraulic station;

[0049] S7: Check whether all parts of the micro pull-top drill are installed properly, whether all hydraulic pipes are connected properly, and whether the whole machine is fixed properly;

[0050] S8: After confirmation, start the hydraulic station and conduct a trial run of the micro-pull top drilling rig;

[0051] S9: Install the pilot drill rod and pilot drill bit, operate the rotary control valve and push-pull control valve of the micro-pull top drilling rig, and make the pilot drill bit and pilot drill rod move forward along the old pipeline trajectory toward the receiving well;

[0052] S10: After the pilot drill bit and the pilot drill rod arrive at the receiving well, the pilot drill bit is removed and the Bafang sleeve rod and the compound rotary cutting, crushing and reaming device are installed respectively. The rotary control valve and the push-pull control valve of the micro-pull top drilling rig are operated to make the compound rotary cutting, crushing and reaming device advance along the trajectory of the old pipeline toward the working well while rotary cutting and crushing the old pipeline.

[0053] S11: After the reamer reaches the edge of the receiving well, install a female buckle pull box, a new pipe section, and a concave-convex shaft on one end of the pipe pulling head on the compound rotary cutting and crushing reamer, and use the pipe loading cylinder and pressure plate to press the new pipe into the positioning ring on the pipe pulling head;

[0054] S12: Operate the rotary control valve and push-pull control valve of the micro-pull top drilling rig to make the compound rotary cutting, crushing and reaming device advance along the trajectory of the old pipeline toward the working well, rotary cutting and crushing the old pipeline, and pull the new pipeline into the working well at the same time;

[0055] S13: After completing the replacement of a new pipe section, remove the pipe loading cylinder and the pressing plate, install a new pipe section and the concave-convex shaft, and use the pipe loading cylinder and the pressing plate to press the new pipe into the previous new pipe section. Operate the rotary control valve and the push-pull control valve of the micro-pull top drilling rig to make the compound rotary cutting, crushing and reaming device advance along the trajectory of the old pipe toward the working well, rotary cutting and crushing the old pipe, and pull the new pipe into the working well at the same time.

[0056] S14: Repeat step S11 until all old pipe replacements are completed;

[0057] S15: The old pipeline is replaced and the equipment is dismantled and removed from the site;

[0058] S16: Clean the pipeline and inspect the pipeline.

[0059] The at least one technical solution adopted in the embodiment of the present invention can achieve the following beneficial effects:

[0060] The micro-pull top drilling rig of the present invention has a compact structure. The base assembly, bracket assembly, power assembly and guide drill rod are all independent components, which are assembled into one in a detachable manner and can enter a smaller working well for work. The forward and backward movement of the bracket assembly of the present invention is achieved by a push-pull cylinder, which eliminates the need for a drive device and saves space for drilling rig layout. The present invention can solve the problem that ordinary construction equipment cannot perform rotary cutting and crushing construction in the original working well during construction, ensure that the replacement of old underground pipelines with new pipes meets the design requirements, and at the same time ensure smooth pipeline construction, greatly reducing labor costs during construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0062] Figure 1 The micro top drilling rig structure of the present invention is shown in FIG. Figure 1 ;

[0063] Figure 2 The micro top drilling rig structure of the present invention is shown in FIG. Figure 2 ;

[0064] Figure 3 This is an exploded schematic diagram of the micro top drilling rig of the present invention;

[0065] Figure 4 It is a structural schematic diagram of the base assembly and the bracket assembly of the present invention;

[0066] Figure 5 A schematic diagram of the construction of the present invention;

[0067] Figures 6 to 9 Schematic diagram of the steps of the construction method of the present invention;

[0068] Reference numerals

[0069] Base assembly 1, bracket assembly 2, track shaft 21, push-pull cylinder 22, bracket 23, connecting seat 24, front and rear tightening screws 25, pin shaft 26, power assembly 3, front end motor 31, rear end motor 32, gear box 33, power head 34, hydraulic station 35, guide drill rod 4, guide drill bit 41, water shaft assembly 5, octagonal sleeve rod 6, compound rotary cutting, crushing and reaming device 7, female buckle pull box 8, concave and convex shaft 9, pressure plate 10, pipe loading cylinder 11, small hydraulic station 111, side fixed seat assembly 12, receiving well 13, working well 14, left and right tightening screws 15, rotary control valve 16, push-pull control valve 17, two-speed valve group assembly 18, new pipeline 19, old pipeline 20. DETAILED DESCRIPTION

[0070] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0071] The technical solutions provided by various embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0072] Reference Figures 1 to 9 As shown, the embodiment of the present invention provides a complete set of drilling equipment for updating the original well of small-diameter rainwater and sewage pipelines, including a micro-pull top drilling rig, which includes a base assembly 1, a bracket assembly 2, a power assembly 3 and a guide drill rod 4.

[0073] The base assembly 1 is arranged horizontally, the bracket assembly 2 is connected to the base assembly 1, the power assembly 3 is arranged on the bracket assembly 2, the bracket assembly 2 can drive the position of the power assembly 3 to move horizontally, the guide drill rod 4 is connected to the power assembly 3, and the power assembly 3 drives the guide drill rod 4 to rotate;

[0074] The base assembly 1 is provided with four vertically arranged side fixing seat assemblies 12; the side fixing seat assemblies 12 are provided with connecting angle plates, the connecting angle plates are provided with screw holes, and the side fixing seat assemblies 12 are provided with screw holes, and the side fixing seat assemblies 12 are fastened to the base assembly 1 by bolts. The side fixing seat assemblies 12 are installed with left and right tightening screws 15, which limit the movement of the drilling rig in the left and right directions;

[0075] A detachable guide drill bit 41 is provided at the front of the guide drill rod 4 , and a pipeline renewal device is provided at the front of the guide drill bit 41 .

[0076] During use, the pipeline between the receiving well 13 (the original municipal pipeline working well) and the working well 14 (the original municipal pipeline working well) is updated (refer to Figure 5 shown).

[0077] The base assembly 1, bracket assembly 2, power assembly 3 and guide drill rod 4 of the micro-pull top drilling rig of the present invention are all independent components, which are assembled into one in a detachable manner and can enter a smaller working well 14 for work; the present invention can solve the problem that ordinary construction equipment cannot enter the original working well 14 for rotary cutting and crushing construction during construction, ensure that the replacement of the old underground pipeline 20 with the new pipe meets the design requirements, and at the same time ensure the smoothness of the pipeline construction, greatly reducing the labor cost during construction.

[0078] Preferably, the bracket assembly 2 includes two track shafts 21 detachably mounted on the base assembly 1 and a push-pull cylinder 22 arranged at the center position of the base assembly 1; the two track shafts 21 are provided with a slidingly connected bracket 23, and the telescopic end of the push-pull cylinder 22 is connected to the bracket 23; the bracket 23 is provided with a detachable connecting seat 24, and the connecting seat 24 is provided with a pin shaft 26, and the power assembly 3 is fixed to the connecting seat 24 through the pin shaft 26; the base assembly 1 is provided with front and rear tightening screws 25.

[0079] During use, the push-pull cylinder 22 will drive the bracket 23 to move horizontally on the two track shafts 21. During the movement, the bracket 23 will drive the guide drill bit 41 on the guide drill rod 4 to rotate, thereby driving the composite rotary cutting, crushing and reaming device 7 to rotate and crush the old pipe 20.

[0080] Preferably, the power assembly 3 includes a gear box 33, a power head 34, two front-end motors 31 and two rear-end motors 32 symmetrically arranged on the gear box 33; the guide drill rod 4 is arranged on the power head 34, and the guide drill rod 4 is driven to rotate by the two front-end motors 31 and the two rear-end motors 32; when the two front-end motors 31 and the two rear-end motors 32 work at the same time, they will drive the guide drill rod 4 to rotate, providing power output for the guide drill rod 4.

[0081] Preferably, the gear box 33 is also provided with a rotary control valve 16, a push-pull control valve 17, a dual-speed valve group assembly 18 and a pressure reducing valve group assembly connected to the hydraulic pipes of the front motor 31 and the rear motor 32.

[0082] Preferably, a water shaft assembly 5 is provided on the gear box 33 on the other side of the guide drill rod 4; the water shaft assembly 5 is connected to the mud pump outlet pipe, and mud passes through it during construction.

[0083] Preferably, the pipeline renewal device includes an octagonal sleeve rod 6, a compound rotary cutting, crushing, and reaming device 7, a female buckle pull box 8, a concave-convex shaft 9, a pressure plate 10, and a pipe loading cylinder 11. The octagonal sleeve rod 6 is connected to the guide drill bit 41, and the compound rotary cutting, crushing, and reaming device 7 is connected to the octagonal sleeve rod 6. The compound rotary cutting, crushing, and reaming device 7 is equipped with a transfer case and a pipe pulling head. The pulling head on the pipe pulling head is connected to the female buckle pull box 8, and the female buckle pull box 8 is connected to the concave-convex shaft 9. The pipe loading cylinder 11 is connected to the pressure plate 10. The pipe loading cylinder 11 is connected to a small hydraulic station 111.

[0084] The new pipe 19 is installed on the pipe positioning ring on the pipe pulling head, and the new pipe 19 is pressed onto the pipe pulling head by the pressing plate 10 and the pipe loading cylinder 11. The new pipe 19 replaces the original old pipe 20 while the composite rotary cutting and crushing reamer 7 excavates and reams the hole.

[0085] A construction method for a complete set of drilling equipment for updating the original well of a small-diameter rainwater and sewage pipeline, the construction method comprises the following steps: (refer to Figures 6 to 9 shown)

[0086] S1: widening the working well; widen the bottom of the working well 14 to a diameter of 1200 mm and reinforce it;

[0087] S2: Installation and adjustment of the base assembly; hoist the base assembly 1 and the bracket 23 connector into the working well 14, adjust the elevation, direction and slope of the base assembly 1 and the bracket assembly 2 connector according to the original old pipeline 20 trajectory, adjust the front and rear tightening screws 25 to fix the base assembly 1, and fix the base assembly 1 and the bracket assembly 2 connector;

[0088] S3: Install the side fixing seat assembly; hoist the four side fixing seat assemblies 12 into the working well 14, connect the side fixing seat assembly 12 to the base assembly 1 with bolts and lock them, rotate the screw on the side fixing seat assembly 12 to further fix the base assembly 1;

[0089] S4: Installation of the power head assembly; hoist the power head assembly 34 including the rear end motor 32 into the working well 14, connect the power head assembly 34 to the bracket assembly 2 with the pin 26 and secure it with a round nut;

[0090] S5: Installation of the front motor 31; hoist the front motor 31 into the working well 14 and install it into the power head 34 assembly;

[0091] S6: Connect the hydraulic pipes between the drilling rig and the hydraulic station 35; connect the hydraulic pipes between the motor and the two-speed valve assembly 18, and connect the hydraulic pipes and water pipes between the micro-pull top drilling rig and the hydraulic station 35;

[0092] S7: Check whether all parts of the micro pull-top drill are installed properly, whether all hydraulic pipes are connected properly, and whether the whole machine is fixed properly;

[0093] S8: After confirmation, start the hydraulic station 35 to conduct a trial run of the micro-pull top drilling rig;

[0094] S9: Install the pilot drill rod 4 and the pilot drill bit 41, operate the rotary control valve 16 and the push-pull control valve 17 of the micro-pull top drilling rig, and make the pilot drill bit 41 and the pilot drill rod 4 move along the trajectory of the old pipeline 20 toward the receiving well 13;

[0095] S10: After the pilot drill bit 41 and the pilot drill rod 4 reach the receiving well 13, the pilot drill bit 41 is removed, and the octagonal sleeve rod 6 and the compound rotary cutting, crushing, and reaming device 7 are installed. The rotary control valve 16 and the push-pull control valve 17 of the micro-pull top drilling rig are operated to make the compound rotary cutting, crushing, and reaming device 7 advance along the trajectory of the old pipeline 20 toward the working well 14 while rotary cutting and crushing the old pipeline 20.

[0096] S11: After the reamer reaches the edge of the receiving well 13, a female buckle pull box 8, a new pipe 19, and a concave-convex shaft 9 are installed on one end of the pipe pulling head on the compound rotary cutting and crushing reamer 7. The new pipe 19 is pressed into the positioning ring on the pipe pulling head using the pipe loading cylinder 11 and the pressure plate 10;

[0097] S12: Operate the rotary control valve 16 and the push-pull control valve 17 of the micro-pull top drilling rig to make the compound rotary cutting, crushing and reaming device 7 advance along the trajectory of the old pipe 20 toward the working well 14, rotary cutting and crushing the old pipe 20, and at the same time pull the new pipe 19 into the working well 14;

[0098] S13: After completing the replacement construction of a new pipe section 19, the pipe loading cylinder 11 and the pressing plate 10 are removed, and a new pipe section and the concave-convex shaft 9 are installed. The new pipe 19 is pressed into the previous new pipe section 19 by the pipe loading cylinder 11 and the pressing plate 10. The rotary control valve 16 and the push-pull control valve 17 of the micro-pull top drilling rig are operated to make the compound rotary cutting, crushing and reaming device 7 advance along the trajectory of the old pipe 20 toward the working well 14, rotary cutting and crushing the old pipe 20, and at the same time pull the new pipe 19 into the working well 14;

[0099] S14: Repeat step S11 until all old pipes 20 are replaced;

[0100] S15: The old pipeline 20 is replaced, the equipment is dismantled, and the equipment is removed from the site;

[0101] S16: Clean the pipeline and inspect the pipeline.

[0102] The foregoing is merely an embodiment of the present invention and is not intended to limit the present invention. It will be apparent to those skilled in the art that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are intended to be included within the scope of the claims of the present invention.

Claims

1. A complete set of drilling equipment for updating the original well of small-diameter rainwater and sewage pipelines, characterized by: The micro top drilling rig comprises a base assembly (1), a bracket assembly (2), a power assembly (3) and a guide drill rod (4); The base assembly (1) is arranged horizontally, the bracket assembly (2) is connected to the base assembly (1), the power assembly (3) is connected to the bracket assembly (2), the bracket assembly (2) can drive the power assembly (3) to move horizontally, the guide drill rod (4) is connected to the power assembly (3), and the power assembly (3) drives the guide drill rod (4) to rotate; The base assembly (1) is provided with four vertically arranged side fixing seat assemblies (12); The front portion of the guide drill rod (4) is provided with a detachable guide drill bit (41), and the front portion of the guide drill bit (41) is provided with a pipeline renewal device; The bracket assembly (2) includes two track shafts (21) detachably mounted on the base assembly (1) and a push-pull cylinder (22) disposed at the center of the base assembly (1); The two track shafts (21) are provided with a bracket (23) in sliding connection, and the telescopic end of the push-pull oil cylinder (22) is connected to the bracket (23); The bracket (23) is provided with a detachable connecting seat (24), the connecting seat (24) is provided with a pin shaft (26), and the power assembly (3) is fixed to the connecting seat (24) via the pin shaft (26); The base assembly (1) is provided with front and rear tightening screws (25); The pipeline renewal device comprises an octagonal sleeve rod (6), a composite rotary cutting, crushing and reaming device (7), a female buckle pull box (8), a concave-convex shaft (9), a pressing plate (10) and a pipe loading cylinder (11); The octagonal sleeve rod (6) is connected to the guide drill bit (41), and the composite rotary cutting, crushing and reaming device (7) is connected to the octagonal sleeve rod (6); The composite rotary cutting, crushing and reaming device (7) is equipped with a distributor and a tube pulling head, and the pulling head on the tube pulling head is connected to the female buckle pulling box (8); The female buckle pull box (8) is connected to the concave-convex shaft (9), and the pipe loading cylinder (11) is connected to the pressing plate (10).

2. The complete set of drilling equipment for updating the original well of small-diameter rainwater and sewage pipes according to claim 1 is characterized by: The power assembly (3) includes a gear box (33), a power head (34), two front motors (31) and two rear motors (32) symmetrically arranged on the gear box (33); The guide drill rod (4) is arranged on a power head (34), and the guide drill rod (4) is driven to rotate by two front-end motors (31) and two rear-end motors (32).

3. The complete set of drilling equipment for updating the original well of small-diameter rainwater and sewage pipes according to claim 2 is characterized by: The gear box (33) is also provided with a rotary control valve (16), a push-pull control valve (17), a dual-speed valve group assembly (18) and a pressure reducing valve group assembly connected to the hydraulic pipes of the front motor (31) and the rear motor (32).

4. The complete set of drilling equipment for updating the original well of small-diameter rainwater and sewage pipes according to claim 2 is characterized by: A water shaft assembly (5) is provided on the gear box (33) on the other side of the guide drill rod (4).

5. The complete set of drilling equipment for updating the original well of small-diameter rainwater and sewage pipes according to claim 1 is characterized by: Left and right tightening screws (15) are installed on the side fixing seat assembly (12).

6. A construction method for a complete set of drilling equipment for updating an existing well of a small-diameter rainwater and sewage pipeline according to any one of claims 1 to 5, characterized in that: The construction method comprises the following steps: S1: widening the working well; widening the bottom of the working well (14) to a diameter of 1200 mm and reinforcing it; S2: Installation and adjustment of the base assembly; hoist the base assembly (1) and the bracket (23) connector into the working well (14), adjust the elevation, direction and slope of the base assembly (1) and the bracket assembly (2) connector according to the original old pipeline (20) trajectory, adjust the front and rear tightening screws (25) to fix the base assembly (1), and fix the base assembly (1) and the bracket assembly (2) connector; S3: Install the side fixing seat assembly; hoist the four side fixing seat assemblies (12) into the working well (14), connect the side fixing seat assembly (12) and the base assembly (1) with bolts and lock them, rotate the screw on the side fixing seat assembly (12) to further fix the base assembly (1); S4: Install the power head assembly; hoist the power head (34) assembly including the rear end motor (32) into the working well (14), connect the power head (34) assembly to the bracket assembly (2) with the pin (26) and tighten with a round nut; S5: Install the front motor (31); hoist the front motor (31) into the working well (14) and install it into the power head (34) assembly; S6: Connect the hydraulic pipes between the drilling rig and the hydraulic station (35); connect the hydraulic pipes between the motor and the two-speed valve assembly (18), and connect the hydraulic pipes and water pipes between the micro-pull top drilling rig and the hydraulic station (35); S7: Check whether all parts of the micro pull-top drill are installed properly, whether all hydraulic pipes are connected properly, and whether the whole machine is fixed properly; S8: After confirmation, start the hydraulic station (35) and conduct a trial run of the micro-pull top drilling rig; S9: Install the guide drill rod (4) and the guide drill bit (41), operate the rotary control valve (16) and the push-pull control valve (17) of the micro-pull top drilling rig, and make the guide drill bit (41) and the guide drill rod (4) move forward along the trajectory of the old pipeline (20) toward the receiving well (13); S10: After the guide drill bit (41) and the guide drill rod (4) arrive at the receiving well (13), the guide drill bit (41) is removed, and the octagonal sleeve rod (6) and the compound rotary cutting, crushing and reaming device (7) are respectively installed. The rotary control valve (16) and the push-pull control valve (17) of the micro-pull top drilling rig are operated to make the compound rotary cutting, crushing and reaming device (7) advance along the trajectory of the old pipeline (20) toward the working well (14), while rotary cutting and crushing the old pipeline (20); S11: After the reamer reaches the edge of the receiving well (13), a female buckle pull box (8), a new pipe (19), and a concave-convex shaft (9) are installed on one end of the pipe pulling head on the composite rotary cutting and crushing reamer (7), and the new pipe (19) is pressed into the positioning ring on the pipe pulling head using the pipe loading cylinder (11) and the pressure plate (10); S12: Operate the rotary control valve (16) and the push-pull control valve (17) of the micro-pull top drilling rig to make the composite rotary cutting and crushing reamer (7) advance along the trajectory of the old pipe (20) toward the working well (14), rotary cutting and crushing the old pipe (20), and at the same time pull the new pipe (19) into the working well (14); S13: After completing the replacement construction of a new pipe (19), the pipe loading cylinder (11) and the pressure plate (10) are removed, and a new pipe and the concave-convex shaft (9) are installed. The new pipe (19) is pressed into the previous new pipe (19) by the pipe loading cylinder (11) and the pressure plate (10). The rotary control valve (16) and the push-pull control valve (17) of the micro-pull top drilling rig are operated to make the composite rotary cutting and crushing reamer (7) advance along the trajectory of the old pipe (20) toward the working well (14), rotary cutting and crushing the old pipe (20), and at the same time, pull the new pipe (19) into the working well (14); S14: Repeat step S11 until all old pipes (20) are replaced; S15: The old pipeline (20) is replaced, the equipment is dismantled, and the equipment is removed from the site; S16: Clean the pipeline and inspect the pipeline.

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