Deep foundation pit assembled wall protection chuck construction equipment and process

Abstract

The application relates to the technical field of deep foundation pit construction, and discloses deep foundation pit assembly type wall protection chuck construction equipment, which comprises a drill pipe, a wall protection hole drilling assembly, a wall protection chuck pre-positioning assembly and a wall back grouting system are arranged on the drill pipe, a wall protection clamping limiting assembly is arranged on the wall protection hole drilling assembly, a chuck automatic alignment mechanism is installed on the wall protection chuck pre-positioning assembly, the wall protection chuck pre-positioning assembly comprises a mounting ring and a positioning ring, and supporting arms are fixedly connected between the mounting ring and the positioning ring. The wall protection chuck pre-positioning assembly provides an underwater vertical guide reference, real-time monitoring and precision control are realized in cooperation with the wall protection clamping limiting assembly, the hole position, the hole diameter, the perpendicularity and the hole wall integrity meet the assembly type wall protection and chuck installation requirements, hole position deviation leading to assembly failure is avoided from the source, and the wall protection and chuck installation qualified rate is improved.

Description

Technical Field

[0001] This invention relates to the field of deep foundation pit construction technology, specifically to prefabricated retaining wall chuck construction equipment and process for deep foundation pits. Background Technology

[0002] The technology for prefabricated retaining wall and chuck positioning and installation, foundation pit wall stabilization and backfill grouting reinforcement is mainly used for steel sheet pile cofferdams and prefabricated retaining wall positioning and chuck installation in deep water bare rock geological conditions.

[0003] In the current construction of deep foundation pits in deep water bare rock geology, the installation of prefabricated retaining walls and chucks relies on pre-formed high-precision hole positions. After the hole positions are formed, there are common problems such as the hole wall being prone to instability and collapse, large deviation of the positioning benchmark, difficulty in underwater alignment, and complicated reinforcement procedures behind the wall.

[0004] Traditional construction methods rely on simple positioning devices to determine the installation benchmarks for the retaining wall and chuck. When the borehole wall becomes loose or collapses, the machine must be stopped and the grouting pipe must be manually lowered for backfilling. This involves many underwater intervention steps and has a low degree of automation. The accuracy of borehole formation and the stability of the borehole wall are difficult to guarantee, which directly affects the compatibility of the assembled retaining wall and chuck. Reinforcement behind the wall requires interruption of work. The overall process is time-consuming and has low construction efficiency. Underwater construction safety and borehole stability are insufficient, which cannot meet the actual requirements of positioning accuracy, borehole wall integrity, and construction continuity for the installation of assembled retaining walls and chucks in deep foundation pits. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this invention provides a prefabricated retaining wall chuck construction equipment and process for deep foundation pits. This solves the problems of frequent manual intervention when the borehole wall of a deep foundation pit becomes loose or collapses, making it difficult to guarantee the accuracy of hole formation and the stability of the borehole wall. It also addresses the need to interrupt the reinforcement work behind the wall, which affects the assembly compatibility between the prefabricated retaining wall and the chuck.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the present invention provides the following technical solution: a prefabricated wall-supporting chuck construction device for deep foundation pits, comprising a drill pipe, wherein the drill pipe is equipped with a wall-supporting pilot hole drilling assembly, a wall-supporting chuck pre-positioning assembly, and a wall-back grouting system; the wall-supporting pilot hole drilling assembly is equipped with a wall-supporting clamping and limiting assembly; the wall-supporting chuck pre-positioning assembly is equipped with an automatic chuck alignment mechanism; the wall-supporting chuck pre-positioning assembly includes an installation ring and a positioning ring, wherein a support arm is fixedly connected between the installation ring and the positioning ring; the positioning ring is provided with... At the underwater foundation pit pilot hole location, the backfill grouting system includes two sleeves symmetrically installed on both sides of the outer wall of the drill pipe. Each side of the drill pipe's outer wall has a sliding channel communicating with the sleeve. A grouting pipe is slidably connected between the sliding channel and the sleeve. Each grouting pipe has an array of travel grooves. A grouting port is installed at the inner end of each sliding channel. The grouting port is magnetically attracted to the grouting pipe on the same side. A feed pipe is connected to the grouting port and slidably connected to the grouting pipe. The inner wall of the grouting pipe has the same diameter as the guide pipe and is aligned. The automatic chuck alignment mechanism includes a waterproof housing. The waterproof housing integrates a microprocessor, a wireless communication module, a signal conditioning circuit, and a power module. Support plates are installed on both sides of the bottom of the waterproof housing. A dual-axis motor is installed inside the waterproof housing. The two output shafts of the dual-axis motor movably pass through the waterproof housing and are rotatably connected to the two support plates. A rod sleeve is rotatably connected to each output shaft of the dual-axis motor. Each of the first rod sleeves is fixedly connected to a support rod, and each of the support rods is fixedly connected to a second rod sleeve. The second rod sleeves are rotatably connected to a rotating shaft. A traveling block corresponding to the traveling groove is fixedly connected to the middle of the rotating shaft. The rotating shaft abuts against the traveling groove. Rotating rods are fixedly connected to both ends of the rotating shaft. Irregularly shaped floats are installed on the rotating rods. The area of ​​one side of the irregularly shaped float is larger than that of the other side. Toothed pulleys are fixedly sleeved on both sides of the rotating shaft and the output shaft of the dual-axis motor. A transmission toothed belt meshes between the two toothed pulleys on the same side.

[0009] Preferably, the wall protection pilot hole drilling assembly includes a down-the-hole (DH) drill bit connecting end and a DH drill bit drilling end, which are fixedly connected. The DH drill bit connecting end is installed inside the drill pipe. Two limiting holes are symmetrically opened on the DH drill bit drilling end. Six slag discharge holes are circumferentially opened on the DH drill bit drilling end. Each slag discharge hole is connected to a filter screen, and the area of ​​each filter screen is half the inner diameter area of ​​the slag discharge hole. A drainage groove corresponding to the position of the slag discharge hole is opened on the DH drill bit connecting end. A slag inlet hole is opened at the center of the DH drill bit drilling end, and the slag inlet hole is connected to the six slag discharge holes. The drill pipe and the DH drill bit drilling end both pass vertically between the mounting ring and the positioning ring.

[0010] Preferably, the wall-protecting clamping and limiting assembly includes an installation block, which is installed on the outer wall of the drilling end of the down-the-hole drill bit. The installation block has a sliding groove, and a locking block is slidably connected in the sliding groove. A spring is elastically connected between the locking block and the sliding groove.

[0011] Preferably, a guide tube is slidably connected inside one of the limiting holes, a discharge port is opened on the side wall of the guide tube, a slider is fixedly connected to the guide tube, a slot is opened on the guide tube, the locking block engages with the slot, the top end of the guide tube is open, and the bottom end of the guide tube is sealed and integrated with a pressure sensor.

[0012] Preferably, there are two wall-protecting clamping and limiting components, which are symmetrically installed on the drilling end of the down-the-hole drill bit. The mounting blocks in the two wall-protecting clamping and limiting components are respectively close to the two limiting holes, and each of the two limiting holes is provided with a guide groove for sliding of the slider.

[0013] Preferably, there are two chuck automatic alignment mechanisms, which are symmetrically arranged on the mounting ring, and the waterproof housings of both chuck automatic alignment mechanisms are mounted on the mounting ring.

[0014] The construction process of prefabricated retaining wall chuck for deep foundation pits, based on the aforementioned prefabricated retaining wall chuck construction equipment, includes the following steps:

[0015] Step 1: Construction preparation for foundation pit wall protection and chuck. Conduct geological and hydrological surveys of the deep foundation pit, and determine the positioning benchmarks for the pilot hole and wall protection by combining the parameters of the prefabricated wall protection, chuck installation and steel sheet pile cofferdam. Formulate a foundation pit protection and chuck assembly plan.

[0016] Step 2: Debugging of the wall protection positioning and grouting system, completing the assembly and verification of the wall protection chuck pre-positioning component, the wall protection clamping and limiting component, the wall back grouting system and the chuck automatic alignment mechanism;

[0017] Step 3: Wall reference positioning and hole forming. The wall chuck is pre-positioned by setting up the positioning line and establishing an underwater vertical positioning reference. High-precision holes are formed according to the reference to fit the wall and chuck installation.

[0018] Step 4: Hole wall stabilization and real-time grouting reinforcement. The hole wall status is monitored by the wall clamping and limiting components. When an alarm is triggered, the chuck automatic alignment mechanism drives the grouting system behind the wall to descend and automatically connect. The hole wall gaps are continuously drilled and grouted in real time to backfill, ensuring the integrity and stability of the wall installation surface.

[0019] Step 5: After the wall protection and chuck installation conditions are formed and the hole positions are formed, the hole wall protective sleeve is inserted, and the integrity of the hole wall, hole diameter and verticality are checked to form a stable construction foundation that meets the assembly requirements of the prefabricated wall protection and chuck.

[0020] (III) Beneficial Effects

[0021] Compared with the prior art, the present invention provides a prefabricated retaining wall chuck construction equipment and process for deep foundation pits, which has the following beneficial effects:

[0022] 1. This deep foundation pit prefabricated retaining wall chuck construction equipment provides an underwater vertical guide reference through the retaining wall chuck prepositioning component, and achieves real-time monitoring and precision control in conjunction with the retaining wall clamping and limiting component. This ensures that the hole position, hole diameter, verticality and hole wall integrity meet the installation requirements of the prefabricated retaining wall and chuck, thereby avoiding assembly failure caused by hole position deviation and improving the qualification rate of retaining wall and chuck installation.

[0023] 2. This prefabricated retaining wall chuck construction equipment for deep foundation pits can quickly warn of the risk of borehole wall collapse through retaining wall clamping and limiting components. The automatic chuck alignment mechanism is linked with the grouting system behind the wall to realize automatic underwater grouting and backfilling of gaps. There is no need to stop the machine or manually lower the guide pipe, which avoids borehole wall expansion and collapse and damage to the installation surface, ensures construction continuity, and greatly reduces rework.

[0024] 3. This prefabricated retaining wall chuck construction equipment for deep foundation pits achieves underwater buoyancy attitude self-adjustment and automatic and precise docking of grouting pipes through the irregular floating plate and transmission structure of the chuck automatic alignment mechanism, reducing underwater manual intervention; waterproof electrical control and wireless transmission are adapted to deep water and deep foundation pit operation scenarios, significantly improving equipment stability and construction safety.

[0025] 4. This prefabricated retaining wall chuck construction equipment for deep foundation pits employs casing protection and integrity testing after hole formation. The ducts are regular and the stress is stable, providing a high-quality installation foundation for prefabricated retaining walls and chucks inside deep foundation pits, thereby improving the construction quality and durability of the overall foundation pit retaining structure.

[0026] 5. This prefabricated retaining wall chuck construction equipment for deep foundation pits can be used in conjunction with pilot hole operations to achieve retaining wall positioning and grouting reinforcement during the hole formation process. It can also be directly applied to pre-formed holes. By simply using drill pipe guidance, pre-positioning benchmark, automatic alignment and wall grouting system, the positioning of prefabricated retaining wall and chuck installation for deep foundation pits and the reinforcement of the hole wall can be completed. It has a wider range of applications and stronger versatility. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the pre-positioning component of the wall-mounted chuck of the present invention;

[0029] Figure 3 This is a connection diagram of the drill pipe and wall protection pilot hole drilling assembly of the present invention;

[0030] Figure 4 For the present invention Figure 3 Enlarged view of A in the middle;

[0031] Figure 5 For the present invention Figure 3 Enlarged view of B in the middle;

[0032] Figure 6 This is an exploded view of the mounting block and the card block of the present invention;

[0033] Figure 7 This is a schematic diagram of the guide tube of the present invention;

[0034] Figure 8 This is a schematic diagram of the structure of the wall protection pilot hole drilling assembly of the present invention;

[0035] Figure 9 For the present invention Figure 1 Enlarged view of C;

[0036] Figure 10 This is a schematic diagram of the automatic chuck alignment mechanism of the present invention.

[0037] In the diagram: 1. Drill pipe; 2. Wall protection pilot hole drilling assembly; 21. Down-the-hole drill bit connection end; 22. Down-the-hole drill bit drilling end; 23. Limiting hole; 24. Slag discharge hole; 25. Filter screen; 26. Drainage channel; 27. Slag inlet hole; 3. Wall protection chuck pre-positioning assembly; 31. Mounting ring; 32. Positioning ring; 33. Support arm; 4. Wall protection clamping and limiting assembly; 41. Mounting block; 42. Slide groove; 43. Clamping block; 44. Spring; 45. Guide tube; 46. Discharge. 47. Slider; 48. Slot; 49. Pressure sensor; 5. Backfill grouting system; 51. Pipe sleeve; 52. Grouting pipe; 53. Traveling groove; 54. Grouting port; 55. Feed pipe; 6. Automatic chuck alignment mechanism; 61. Waterproof housing; 62. Support plate; 63. Rod sleeve one; 64. Support rod; 65. Rod sleeve two; 66. Rotating shaft; 67. Traveling block; 68. Rotating rod; 69. Irregular floating plate; 610. Toothed pulley; 611. Transmission toothed belt. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Please see Figure 1-10This invention provides a prefabricated retaining wall chuck construction device for deep foundation pits, including a drill pipe 1. A standard casing is used only to guide the equipment down into the foundation pit hole. The drill pipe 1 is equipped with a retaining wall pilot hole drilling assembly 2, a retaining wall chuck pre-positioning assembly 3, and a wall backfilling grouting system 5. The retaining wall pilot hole drilling assembly 2 is equipped with a retaining wall clamping and limiting assembly 4. The retaining wall chuck pre-positioning assembly 3 is equipped with an automatic chuck alignment mechanism 6. The retaining wall chuck pre-positioning assembly 3 includes an installation ring 31 and a positioning ring 32. A support arm 33 is fixedly connected between ring 31 and positioning ring 32. Positioning ring 32 is set on the ground surface at the underwater pilot hole location. Drill pipe 1 and down-the-hole drill bit 22 both pass vertically between mounting ring 31 and positioning ring 32. Positioning ring 32 is used to select the underwater pilot hole location on the ground surface. Combined with mounting ring 31, drilling pipe 1 and wall protection pilot hole drilling assembly 2 are vertically positioned to avoid pilot hole position deviation and verticality deviation caused by position shift during drilling. This lays the positional foundation for subsequent wall protection and chuck installation.

[0040] Furthermore, after the collapse warning is triggered, there is no need to remove the borehole equipment, enabling real-time and automated backfilling of the collapse area and avoiding accuracy deviations caused by cavity expansion. The wall-mounted grouting system 5 includes two sleeves 51, which are symmetrically installed on both sides of the outer wall of the drill pipe 1. Both sides of the outer wall of the drill pipe 1 are provided with slides that communicate with the sleeves 51. Grouting pipes 52 are slidably connected between the slides of the drill pipe 1 and the sleeves 51. Each grouting pipe 52 is provided with an array of travel grooves. 53. Grouting ports 54 are installed at the inner end of the slide. The grouting ports 54 are magnetically attracted to the grouting pipes 52 on the same side. A feed pipe 55 is connected to the grouting port 54. The feed pipe 55 is slidably connected to the inner wall of the grouting pipe 52. The diameter of the grouting pipe 52 is the same as the diameter of the guide pipe 45 and is aligned. Through the quick docking of the grouting pipe 52 and the guide pipe 45, the feed pipe 55 is used to transport mud from the grouting port 54 and directly fill the collapsed gap through the discharge port 46.

[0041] In this embodiment, the chuck automatic alignment mechanism 6 includes a waterproof housing 61. The waterproof housing 61 integrates a microprocessor, a wireless communication module, a signal conditioning circuit, and a power module. Support plates 62 are installed on both sides of the bottom of the waterproof housing 61. A dual-axis motor is installed inside the waterproof housing 61. The two output shafts of the dual-axis motor movably pass through the waterproof housing 61 and are rotatably connected to the two support plates 62. A first rod sleeve 63 is rotatably connected to each output shaft of the dual-axis motor. Support rods 64 are fixedly connected to each of the two first rod sleeves 63. A second rod sleeve 65 is fixedly connected to each support rod 64. A rotating shaft 66 is rotatably connected between the second rod sleeves 65. A travel block 67 corresponding to the travel groove 53 is fixedly connected to the middle of the rotating shaft 66. The rotating shaft 66 abuts against the travel groove 53. Through the cooperation of the dual-axis motor and the transmission toothed belt 611, the rotating shaft 66 is driven to rotate, utilizing the travel block 67. 7 engages with the travel groove 53, pushing the grouting pipe 52 to descend precisely, realizing the automatic docking of the grouting pipe 52 and the guide pipe 45. Both ends of the rotating shaft 66 are fixedly connected to rotating rods 68, and each rotating rod 68 is equipped with a special-shaped float 69. The area of ​​one side of the special-shaped float 69 is larger than that of the other side. Through the buoyancy characteristics of the special-shaped float 69, the posture of the support rod 64 is automatically adjusted. When not in operation, the dual-axis motor reverses, so that the chuck automatic alignment mechanism 6 continuously moves away from the wall grouting system 5. Toothed pulleys 610 are fixedly sleeved on both sides of the rotating shaft 66 and the output shaft of the dual-axis motor. The two toothed pulleys 610 on the same side are meshed with a transmission toothed belt 611. There are two chuck automatic alignment mechanisms 6. The two chuck automatic alignment mechanisms 6 are symmetrically arranged on the mounting ring 31. The waterproof housing 61 in the two chuck automatic alignment mechanisms 6 are both installed on the mounting ring 31.

[0042] It is worth noting that the wall protection pilot hole drilling assembly 2 includes a down-the-hole (DH) drill bit connecting end 21 and a DH drill bit drilling end 22. The DH drill bit drilling end 22 directly breaks the bare rock in the foundation pit to achieve pilot hole operation. The DH drill bit connecting end 21 and the DH drill bit drilling end 22 are fixedly connected. The DH drill bit connecting end 21 is installed inside the drill pipe 1. Two limiting holes 23 are symmetrically opened on the DH drill bit drilling end 22. Six slag discharge holes 24 are arranged around the DH drill bit drilling end 22, and each slag discharge hole 24 is connected to a filter screen 25. Each filter screen... The area of ​​each of the 25 is half the inner diameter area of ​​the slag discharge hole 24. A drainage groove 26 corresponding to the position of the slag discharge hole 24 is opened on the connecting end 21 of the down-the-hole drill bit. A slag inlet hole 27 is opened in the center of the drilling end 22 of the down-the-hole drill bit. The slag inlet hole 27 is connected to the six slag discharge holes 24. By utilizing the cooperation of the slag inlet hole 27, the slag discharge holes 24, the filter screen 25 and the drainage groove 26, the solid-liquid separation of rock slag and water is completed under the action of centrifugal force of the drill bit rotation, avoiding blockage and drill jamming in the hole, while ensuring stable contact between the drill bit and the rock strata, providing a basis for the accurate detection of the sensor.

[0043] It is worth noting that the wall-mounting clamping and limiting assembly 4 includes a mounting block 41, which is installed on the outer wall of the drilling end 22 of the down-the-hole drill bit. A groove 42 is provided on the mounting block 41, and a locking block 43 is slidably connected within the groove 42. A spring 44 elastically connects the locking block 43 and the groove 42. A guide tube 45 is slidably connected within one of the limiting holes 23. A discharge port 46 is provided on the side wall of the guide tube 45, and a slider 47 is fixedly connected to the guide tube 45. A slot 48 is provided on the guide tube 45, and the locking block 43 engages with the slot 48. This engagement initially limits the guide tube 45, ensuring that the guide tube 45 remains in a non-collapsed state. 5. It does not fall off and can be controlled to descend in case of collapse, providing a precise guiding channel for the mud delivery of the back wall grouting system 5. The top end of the guide pipe 45 is set with an opening, and the bottom end of the guide pipe 45 is set with a sealed end and integrated with a pressure sensor 49. The pressure sensor 49 monitors the contact pressure between the drill bit and the rock layer in real time. When the pressure changes suddenly, a collapse warning is triggered. There are two wall clamping and limiting components 4. The two wall clamping and limiting components 4 are symmetrically installed on the drilling end 22 of the down-the-hole drill bit. The mounting blocks 41 in the two wall clamping and limiting components 4 are respectively close to the two limiting holes 23. The two limiting holes 23 are each provided with a guide groove for the sliding of the slider 47.

[0044] The construction process of prefabricated retaining wall chuck for deep foundation pits, based on the aforementioned prefabricated retaining wall chuck construction equipment, includes the following steps:

[0045] Step 1: Construction preparation for foundation pit wall protection and chuck. Conduct geological and hydrological surveys of the deep foundation pit, and determine the positioning benchmarks for the pilot hole and wall protection by combining the parameters of the prefabricated wall protection, chuck installation and steel sheet pile cofferdam. Formulate a foundation pit protection and chuck assembly plan.

[0046] Step 2: Debugging of the wall protection positioning and grouting system, completing the assembly and verification of the wall protection chuck pre-positioning component 3, the wall protection clamping and limiting component 4, the wall back grouting system 5, and the chuck automatic alignment mechanism 6;

[0047] Step 3: Wall reference positioning and hole forming. The wall chuck prepositioning component 3 is placed using positioning and layout lines to establish an underwater vertical positioning reference. High-precision holes are formed according to the reference to adapt to the wall and chuck installation.

[0048] Step 4: Hole wall stabilization and real-time grouting reinforcement. The hole wall status is monitored by the wall clamping and limiting component 4. When an early warning is triggered, the chuck automatic alignment mechanism 6 drives the wall grouting system 5 to descend and automatically connect, continuously drilling and grouting backfilling the gaps in the hole wall to ensure the integrity and stability of the wall installation surface.

[0049] Step 5: After the wall protection and chuck installation conditions are formed and the hole positions are formed, the hole wall protective sleeve is inserted, and the integrity of the hole wall, hole diameter and verticality are checked to form a stable construction foundation that meets the assembly requirements of the prefabricated wall protection and chuck.

[0050] Working principle: The down-the-hole drill rig lowers the drill pipe 1 and the wall-supporting pilot hole drilling assembly 2 into the deep underwater foundation pit area. The wall-supporting chuck pre-positioning assembly 3 serves as the positioning chuck reference structure for the prefabricated wall-supporting installation, pre-positioning and guiding the hole position, providing a precise center and verticality reference for the subsequent installation of the wall-supporting structure and chuck. The positioning ring 32 sits on the ground surface at the bottom of the foundation pit, forming a stable support surface, ensuring that the drill pipe 1 and the wall-supporting pilot hole drilling assembly 2 drill accurately in the vertical direction. Under the action of water buoyancy, the irregular float plate 69 automatically adjusts to a vertical state around the rod sleeve 63, so that there is no interference above the chuck reference, ensuring that the drilling path does not deviate.

[0051] During the drilling process, rock and soil debris and water enter through the slag inlet hole 27 and are discharged through the slag outlet hole 24. The filter screen 25 and the drainage channel 26 work together to achieve solid-liquid separation, avoid blockage and drill jamming in the hole, ensure regular hole wall and uniform hole diameter, and provide high-quality channels for the installation of prefabricated wall protection and chuck.

[0052] The wall-protecting clamping and limiting component 4 undertakes the functions of borehole wall stability monitoring and chuck positioning assistance. The clamping block 43 and the clamping groove 48 engage to achieve the initial positioning of the guide tube 45. The pressure sensor 49 at the bottom of the guide tube 45 monitors the contact pressure of the rock strata in the borehole in real time. When the borehole wall shows signs of loosening, voids, or collapse, the pressure signal changes abruptly. The system quickly identifies and feeds back to the microprocessor and activates the borehole protection mechanism to ensure that the borehole quality meets the requirements of wall protection and chuck installation.

[0053] After the protection action is activated, the microprocessor in the chuck automatic alignment mechanism 6 drives the dual-axis motor to rotate forward. Through the toothed pulley 610 and the transmission toothed belt 611, the rotating shaft 66 rotates, causing the traveling block 67 to continuously approach the grouting pipe 52. The traveling block 67 meshes with the traveling groove 53 to push the grouting pipe 52 down smoothly and accurately dock with the guide pipe 45 to form a stable grouting channel. The wall-mounted grouting system 5 delivers mud through the feed pipe 55 and the grouting port 54, and directly fills the gaps in the hole wall through the discharge port 46, quickly sealing the potential for collapse and maintaining the hole diameter, verticality, and hole wall integrity.

[0054] After grouting is completed and the grout has initially set, the signal from pressure sensor 49 stabilizes, the dual-axis motor resumes reverse rotation, the irregularly shaped float 69 automatically resets under buoyancy, the travel block 67 disengages from the grouting pipe 52, and after the drill pipe 1 descends a certain distance, the initially set soil pushes the guide pipe 45 back up, the locking block 43 re-enters the slot 48 under the action of spring 44 to complete the reset, the grouting pipe 52 reconnects with the grouting port 54 under magnetic adsorption, and the equipment resumes continuous operation, continuously providing high-precision hole-forming guarantee for the installation of the wall protection and chuck.

[0055] In another embodiment, the wall protection pilot hole drilling assembly 2 and the wall protection clamping and limiting assembly 4 may be omitted, and only the drill pipe 1, the wall protection chuck pre-positioning assembly 3, the wall back grouting system 5 and the chuck automatic alignment mechanism 6 may be retained.

[0056] During construction, the drill pipe 1 is directly lowered into the pre-formed borehole. The wall protection chuck pre-positioning component 3 establishes a vertical positioning benchmark for the wall protection and chuck installation at the borehole opening. The drill pipe 1 serves as a guide channel, guiding the wall back grouting system 5 and the chuck automatic alignment mechanism 6 into the preset position within the borehole. The chuck automatic alignment mechanism 6 drives the wall back grouting system 5 to complete the underwater automatic alignment and borehole wall grouting reinforcement operation. This achieves the same technical effects of wall protection positioning, automatic alignment and docking, and wall back grouting reinforcement, meeting the construction requirements for prefabricated wall protection and chuck installation in deep foundation pits.

[0057] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A prefabricated retaining wall chuck construction device for deep foundation pits, comprising a drill pipe (1), characterized in that: The drill pipe (1) is provided with a wall protection pilot hole drilling assembly (2), a wall protection chuck pre-positioning assembly (3) and a wall back grouting system (5). The wall protection pilot hole drilling assembly (2) is provided with a wall protection clamping and limiting assembly (4). The wall protection chuck pre-positioning assembly (3) is equipped with a chuck automatic alignment mechanism (6). The wall-protecting chuck pre-positioning assembly (3) includes an installation ring (31) and a positioning ring (32). A support arm (33) is fixedly connected between the installation ring (31) and the positioning ring (32). The positioning ring (32) is located at the underwater pit pilot hole position. The wall retaining clamping and limiting component (4) includes an installation block (41) and a guide tube (45). The installation block (41) has a groove (42) and a locking block (43) is slidably connected in the groove (42). A spring (44) is elastically connected between the locking block (43) and the groove (42). The side wall of the guide tube (45) has a discharge port (46). A slider (47) is fixedly connected to the guide tube (45). The guide tube (45) has a slot (48). The locking block (43) is engaged with the slot (48). The locking relationship initially limits the guide tube (45) to ensure that the guide tube (45) does not fall off in the non-collapse state and can be controlled to descend in the collapse state, providing a precise guiding channel for the mud delivery of the wall grouting system (5). The top end of the guide tube (45) is open and the bottom end of the guide tube (45) is sealed and integrated with a pressure sensor (49). The wall-mounted grouting system (5) includes two sleeves (51), which are symmetrically installed on both sides of the outer wall of the drill pipe (1). The outer walls of the drill pipe (1) are provided with slides that communicate with the sleeves (51). A grouting pipe (52) is slidably connected between the slide of the drill pipe (1) and the sleeve (51). A travel groove (53) is arrayed on the grouting pipe (52). A grouting port (54) is installed at the inner end of the slide. The grouting port (54) is magnetically attracted to the grouting pipe (52) on the same side. A feed pipe (55) is connected to the grouting port (54). The feed pipe (55) is slidably connected to the inner wall of the grouting pipe (52). The diameter of the grouting pipe (52) is the same as the diameter of the guide pipe (45) and is aligned. The automatic chuck alignment mechanism (6) includes a waterproof housing (61). The waterproof housing (61) integrates a microprocessor, a wireless communication module, a signal conditioning circuit, and a power supply module. A pressure sensor (49) monitors the contact pressure of the rock strata in the borehole in real time. When the borehole wall becomes loose, has gaps, or shows a tendency to collapse, the pressure signal changes abruptly, and the system quickly identifies and feeds back to the microprocessor. Support plates (62) are installed on both sides of the bottom of the waterproof housing (61). A dual-axis motor is installed inside the waterproof housing (61). The two output shafts of the dual-axis motor move through the waterproof housing (61) and are rotatably connected to the two support plates (62). A rod sleeve (63) is rotatably connected to each output shaft of the dual-axis motor. Each of the two shafts is fixedly connected to a support rod (64), and each of the support rods (64) is fixedly connected to a rod sleeve (65). A rotating shaft (66) is rotatably connected between the rod sleeves (65). A traveling block (67) corresponding to the traveling groove (53) is fixedly connected to the middle of the rotating shaft (66). The rotating shaft (66) abuts against the traveling groove (53). Rotating rods (68) are fixedly connected to both ends of the rotating shaft (66). A special-shaped float plate (69) is installed on each of the rotating rods (68). The area of ​​one side of the special-shaped float plate (69) is larger than that of the other side. Toothed pulleys (610) are fixedly sleeved on both sides of the rotating shaft (66) and the output shafts of the dual-axis motor. A transmission toothed belt (611) meshes between the two toothed pulleys (610) on the same side.

2. The prefabricated retaining wall chuck construction equipment for deep foundation pits according to claim 1, characterized in that: The wall protection pilot hole drilling assembly (2) includes a down-the-hole drill bit connection end (21) and a down-the-hole drill bit entry end (22). The down-the-hole drill bit connection end (21) and the down-the-hole drill bit entry end (22) are fixedly connected. The down-the-hole drill bit connection end (21) is installed inside the drill pipe (1). Two limiting holes (23) are symmetrically opened on the down-the-hole drill bit entry end (22). Six slag discharge holes (24) are circumferentially opened on the down-the-hole drill bit entry end (22). Each slag discharge hole (24) is connected to a [missing information]. The area of ​​each filter screen (25) is half the area of ​​the inner diameter of the slag discharge hole (24). The down-the-hole drill bit connection end (21) is provided with a drainage groove (26) corresponding to the position of the slag discharge hole (24). The center of the down-the-hole drill bit entry end (22) is provided with a slag inlet hole (27). The slag inlet hole (27) is connected to the six slag discharge holes (24). The drill pipe (1) and the down-the-hole drill bit entry end (22) both pass vertically between the mounting ring (31) and the positioning ring (32).

3. The prefabricated retaining wall chuck construction equipment for deep foundation pits according to claim 2, characterized in that: The mounting block (41) is installed on the outer wall of the drilling end (22) of the downhole drill bit, and the guide tube (45) is slidably connected in one of the limiting holes (23).

4. The deep foundation pit prefabricated retaining wall chuck construction equipment according to claim 3, characterized in that: There are two wall clamping and limiting components (4). The two wall clamping and limiting components (4) are symmetrically installed on the drilling end (22) of the downhole drill bit. The mounting blocks (41) in the two wall clamping and limiting components (4) are close to the two limiting holes (23). The two limiting holes (23) are provided with guide grooves for sliding of the slider (47).

5. The prefabricated retaining wall chuck construction equipment for deep foundation pits according to claim 1, characterized in that: There are two chuck automatic alignment mechanisms (6), which are symmetrically arranged on the mounting ring (31). The waterproof housing (61) of both chuck automatic alignment mechanisms (6) is installed on the mounting ring (31).

6. Construction technology of prefabricated retaining wall chuck for deep foundation pits, and the prefabricated retaining wall chuck construction equipment for deep foundation pits according to any one of claims 1-5, characterized in that, Includes the following steps: Step 1: Construction preparation for foundation pit wall protection and chuck. Conduct geological and hydrological surveys of the deep foundation pit, and determine the positioning benchmarks for the pilot hole and wall protection by combining the parameters of the prefabricated wall protection, chuck installation and steel sheet pile cofferdam. Formulate a foundation pit protection and chuck assembly plan. Step 2: Debugging of the wall positioning and grouting system, completing the assembly and verification of the wall chuck pre-positioning component (3), the wall clamping and limiting component (4), the wall back grouting system (5) and the chuck automatic alignment mechanism (6); Step 3: Wall reference positioning and hole forming. The wall chuck is prepositioned using positioning and layout (3) to establish an underwater vertical positioning reference. High-precision holes are formed according to the reference to adapt to the wall and chuck installation. Step 4: Hole wall stabilization and real-time grouting reinforcement. The hole wall status is monitored by the wall clamping and limiting component (4). When an early warning is triggered, the chuck automatic alignment mechanism (6) drives the wall back grouting system (5) to descend and automatically dock. The hole wall gaps are continuously drilled and backfilled with grout in real time to ensure the integrity and stability of the wall installation surface. Step 5: After the wall protection and chuck installation conditions are formed and the hole positions are formed, the hole wall protective sleeve is inserted, and the integrity of the hole wall, hole diameter and verticality are checked to form a stable construction foundation that meets the assembly requirements of the prefabricated wall protection and chuck.

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