A method for preventing hole collapse in construction of a full-sand large-diameter pile foundation

Abstract

The application belongs to the technical field of building construction, and particularly relates to a full-sand-layer large-diameter pile foundation anti-collapsing hole construction method. The full-sand-layer large-diameter pile foundation anti-collapsing hole construction method comprises the following steps: S4, after the reinforcement is completed, a rotating shaft is driven to drive a detection static pressure mechanism to move downward by a distance, so that a clear water cleaning mechanism is located at a layer where the detection static pressure mechanism was located before, and the clear water cleaning mechanism is facilitated to absorb and scrape off clear water on a hole side wall under the rotation of the rotating shaft. The full-sand-layer large-diameter pile foundation anti-collapsing hole construction method is convenient for scraping off and absorbing the clear water generated on the hole side wall in the drilling process, improves the shotcrete efficiency, and further reinforces the hole side wall to prevent the hole from collapsing. Meanwhile, the thread sleeve is connected with the concave sleeve and the thread telescopic sleeve in a threaded mode to drive the elastic clamp pipe to clamp the connecting column, so that the concave scraper and the water-absorbing sponge are conveniently installed on the sleeve pipe through the thread sleeve, and are convenient for dismounting and replacing.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building construction, and in particular to a full-sand-layer large-diameter pile foundation anti-collapsing hole construction method. BACKGROUND

[0002] With the continuous development of the infrastructure industry and the continuous improvement of the requirements for pile foundation bearing capacity, the diameter and depth of pile foundations are becoming larger and larger, and part of the bridge site construction is located in the river channel. The river channel is wide and shallow, the water flow is scattered, the erosion and deposition change rapidly, and the geological conditions are basically full sand layer, with a large friction coefficient, a large risk of diameter reduction and hole collapse.

[0003] At present, in order to prevent soil collapse during pile foundation construction, mud is generally injected into the hole sidewall during drilling to form a certain pressure, so that the soil layer is stable and the collapse is prevented. However, this method is not convenient for detecting soil conditions, so it cannot effectively reinforce the weak points of the soil. At the same time, during drilling, the clear water seeping out of the hole sidewall cannot be cleaned, which reduces the adhesion effect of the injected mud and the hole sidewall, thereby affecting the construction progress. SUMMARY

[0004] Based on the existing anti-collapsing hole method, the mud in the hole sidewall is easy to contact with the clear water on the hole sidewall, thereby reducing the adhesion effect of the mud, which is not convenient for better reinforcement, and the soil quality of the hole sidewall cannot be effectively detected and pressurized, thereby affecting the construction efficiency. The present application provides a full-sand-layer large-diameter pile foundation anti-collapsing hole construction method.

[0005] The full-sand-layer large-diameter pile foundation anti-collapsing hole construction method provided by the present application comprises:

[0006] S1, determining the position and size of the pile foundation and marking the construction point.

[0007] S2, using appropriate mechanical equipment to excavate the pile hole according to the design requirements, excavating only a small section of the hole each time.

[0008] S3, after the small section of the hole is excavated, the drill bit is removed, the rotating shaft is inserted into the hole through the walking support, and the soil quality on the hole sidewall is measured and reinforced under the rotation of the rotating shaft.

[0009] S4, after reinforcement, the rotating shaft drives the detection static pressure mechanism to move a distance downward, so that the clear water cleaning mechanism is located at the layer where the detection static pressure mechanism was located before, and the clear water cleaning mechanism absorbs and scrapes off the clear water on the hole sidewall under the rotation of the rotating shaft.

[0010] S5, then drive the rotating shaft to drive the clear water cleaning mechanism to move a distance, so that the cement injection mechanism is located in the layer where the clear water cleaning mechanism is located before, and under the rotation of the rotating shaft, the weak point of the soil detected by the detection static pressure mechanism is treated by cement injection.

[0011] S6, repeat the steps of S2-S5 above until the hole excavation is completed.

[0012] Preferably, the inner surface of the walking support is provided with self-driven sliding rails in symmetrical distribution, the sliding blocks on the four self-driven sliding rails are fixedly connected with support plates, and the upper end of the rotating shaft penetrates through the support plates and is rotatably connected with the inner wall of the support plates through bearings.

[0013] Through the above technical scheme, the sliding blocks on the four self-driven sliding rails move synchronously and at the same frequency, and the up-down movement of the sliding blocks on the self-driven sliding rails drives the up-down movement of the support plates.

[0014] Preferably, the upper surface of the support plate is fixedly installed with a driving motor, one end of the output shaft of the driving motor extends into the support plate and is connected with a driving gear through a fixed sleeve, the surface of the rotating shaft in the support plate is fixedly connected with a driven gear, and the surface of the driving gear is engaged with the surface of the driven gear.

[0015] Through the above technical scheme, the rotation of the driving motor output shaft drives the driving gear, the rotation of the driving gear drives the driven gear through the engagement with the driven gear, and the rotation of the driven gear drives the rotation of the rotating shaft.

[0016] Preferably, the cement injection mechanism comprises branch pipes arranged in symmetrical distribution on the surface of the rotating shaft, two ends of the branch pipes close to the rotating shaft are fixedly connected with cement pipes, two ends of the branch pipes away from the rotating shaft are fixedly installed with nozzles, the inner wall of the rotating shaft is provided with a cavity, the free ends of the two cement pipes extend to the outer surface of the rotating shaft through the cavity, and the surfaces of the two cement pipes are provided with electromagnetic valves.

[0017] Through the above technical scheme, the electromagnetic valve is opened, so that the slurry enters the branch pipe through the cement pipe, and then is sprayed from the nozzle to perform cement injection reinforcement treatment on the inner side wall of the hole.

[0018] Preferably, the clear water cleaning mechanism comprises a sleeve arranged in symmetrical distribution on the surface of the rotating shaft, the inner wall of the sleeve is slidably connected with a threaded sleeve, one end of the threaded sleeve away from the sleeve is fixedly connected with a concave scraper, and the inner surface of the concave scraper is slidably inserted with a water-absorbing sponge.

[0019] Through the technical scheme, the concave scraper and the absorbing sponge are fixed on the sleeve through the threaded sleeve and the sleeve, and the concave scraper is driven to scrape off the clear water on the inner wall of the hole along with the rotation of the rotating shaft.

[0020] Preferably, the inner wall of the sleeve is fixedly installed with a push cylinder, one end of the piston rod of the push cylinder is fixedly connected with a concave sleeve, the concave sleeve is located in the sleeve, and the inner wall of the concave sleeve is threadedly connected with the outer surface of the threaded sleeve.

[0021] Through the technical scheme, the outer thread of one end of the threaded sleeve extending into the sleeve is threadedly connected with the inner thread of the concave sleeve, the extension of the piston rod of the push cylinder drives the threaded sleeve to move through the concave sleeve, thereby driving the concave scraper and the water absorbing sponge to move and contact the inner wall of the hole.

[0022] Preferably, the inner side wall of the concave sleeve is fixedly installed with an elastic tube clamp, the surface of the elastic tube clamp is movably sleeved with a threaded telescopic sleeve, the inner wall of the threaded sleeve is threadedly connected with the surface of the threaded telescopic sleeve, the inner side wall of the threaded sleeve is fixedly connected with a connecting column, and one end of the connecting column is slidably connected with the inner wall of the elastic tube clamp.

[0023] Through the technical scheme, the thread connection between the threaded sleeve and the concave sleeve enables the inner thread of the threaded sleeve to be threadedly connected with the outer thread on the threaded telescopic sleeve, thereby enabling the elastic tube clamp to be squeezed to clamp the surface of the connecting column.

[0024] Preferably, the lower end of the rotating shaft is fixedly connected with a water storage tank body, and the lower end of the water storage tank body is tapered.

[0025] Through the technical scheme, the clear water scraped off by the concave scraper drops along the surface of the concave scraper into the water storage tank body.

[0026] Preferably, the detection static pressure mechanism comprises a support shell symmetrically arranged on the surface of the rotating shaft part, the inner wall of the support shell is fixedly installed with a servo motor, one end of the output shaft of the servo motor is fixedly connected with a screw rod, one end of the screw rod is installed on the inner wall of the support shell through a bearing, the surface of the screw rod is sleeved with a threaded connecting pipe, and the surface of the threaded connecting pipe is slidably clamped with the inner wall of the support shell.

[0027] Through the technical scheme, the rotation of the output shaft of the servo motor drives the screw rod to rotate, and the rotation of the screw rod drives the threaded connecting pipe to move along the inner wall of the support shell.

[0028] Preferably, one end of the threaded connecting pipe away from the support shell is fixedly installed with a pressure sensor, and one end of the pressure sensor away from the threaded connecting pipe is fixedly connected with a static pressure plate.

[0029] Through the technical scheme, the threaded connection pipe drives the pressure sensor and the static pressure plate to move, so that the static pressure plate exerts pressure on the hole side wall, thereby facilitating reinforcement of the hole side wall.

[0030] The beneficial effects of the present application are:

[0031] 1. By arranging the clear water cleaning mechanism, the clear water generated during the drilling process can be scraped and absorbed, the shotcrete efficiency is improved, the hole side wall is further reinforced, the hole collapse is prevented, and the elastic clamp pipe clamps the connecting column through the threaded connection of the threaded sleeve, the concave scraper and the water-absorbing sponge, so that the concave scraper and the water-absorbing sponge are installed on the sleeve pipe through the threaded sleeve, and are convenient to disassemble and replace.

[0032] 2. By arranging the detection static pressure mechanism, the soil quality of the hole side wall is subjected to pressure and detection, so that the hole side wall is reinforced, and the weak part of the hole side wall is easily found, so that the cement shotcreting mechanism is used for shotcreting and reinforcing the weak part of the soil quality. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 A schematic diagram of a full sand layer large-diameter pile foundation anti-collapsing hole construction method is provided for the present application;

[0034] Figure 2 A driven gear structure perspective view of a full sand layer large-diameter pile foundation anti-collapsing hole construction method is provided for the present application;

[0035] Figure 3 A rotating shaft structure perspective view of a full sand layer large-diameter pile foundation anti-collapsing hole construction method is provided for the present application;

[0036] Figure 4 A cavity structure perspective view of a full sand layer large-diameter pile foundation anti-collapsing hole construction method is provided for the present application;

[0037] Figure 5 A sleeve structure perspective view of a full sand layer large-diameter pile foundation anti-collapsing hole construction method is provided for the present application;

[0038] Figure 6 A push air cylinder structure perspective view of a full sand layer large-diameter pile foundation anti-collapsing hole construction method is provided for the present application;

[0039] Figure 7 A threaded sleeve structure perspective view of a full sand layer large-diameter pile foundation anti-collapsing hole construction method is provided for the present application;

[0040] Figure 8 A spring pipe clamp structure perspective view of a full sand layer large-diameter pile foundation anti-collapsing hole construction method is provided for the present application;

[0041] Figure 9A threaded telescopic sleeve structure perspective view of a full sand layer large diameter pile foundation anti-collapsing hole construction method is provided in the present application;

[0042] Figure 10 A connecting column structure perspective view of a full sand layer large diameter pile foundation anti-collapsing hole construction method is provided in the present application;

[0043] Figure 11 A support shell structure perspective view of a full sand layer large diameter pile foundation anti-collapsing hole construction method is provided in the present application;

[0044] Figure 12 A threaded connecting pipe structure perspective view of a full sand layer large diameter pile foundation anti-collapsing hole construction method is provided in the present application;

[0045] Figure 13 A screw structure perspective view of a full sand layer large diameter pile foundation anti-collapsing hole construction method is provided in the present application.

[0046] In the figure: 1, walking support; 2, rotating shaft; 3, support shell; 31, servo motor; 32, screw; 33, threaded connecting pipe; 34, pressure sensor; 35, static pressure plate; 4, casing pipe; 41, threaded sleeve; 42, concave scraper; 43, water-absorbing sponge; 44, push cylinder; 45, concave sleeve; 46, spring pipe clamp; 47, threaded telescopic sleeve; 48, connecting column; 49, water storage tank body; 5, branch pipe; 51, cement pipe; 52, nozzle; 53, cavity; 54, electromagnetic valve; 6, self-driving slide rail; 7, support plate; 8, driving motor; 9, driving gear; 10, driven gear. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all.

[0048] REFERENCE Figures 1-13 A full sand layer large diameter pile foundation anti-collapsing hole construction method, the construction method of the full sand layer large diameter pile foundation anti-collapsing hole comprises:

[0049] S1, determining the position and size of the pile foundation and marking the construction point;

[0050] S2, using appropriate mechanical equipment to excavate the pile foundation hole according to the design requirements, excavating a small section of hole each time;

[0051] S3, after the small section of hole is formed, the drill bit is taken out, the rotating shaft 2 is inserted into the hole through the walking support 1, and the soil quality on the side wall of the hole is measured and reinforced under the rotation of the rotating shaft 2;

[0052] S4, after reinforcement is completed, the detection static pressure mechanism is driven to move down by a distance by the rotating shaft 2, so that the clear water cleaning mechanism is located at the layer where the detection static pressure mechanism is located before, so that the clear water cleaning mechanism can absorb and scrape the clear water on the hole side wall under the rotation of the rotating shaft 2;

[0053] S5, then drive the rotating shaft 2 to drive the clear water cleaning mechanism to move down by a distance, so that the cement spraying mechanism is located at the layer where the clear water cleaning mechanism is located before, and under the rotation of the rotating shaft 2, the weak point of the soil detected by the detection static pressure mechanism is sprayed and reinforced;

[0054] S6, repeat the steps of S2-S5 above until the hole is excavated.

[0055] As Figure 1 shown, in order to facilitate the rotating shaft 2 into the hole, the inner surface of the walking support 1 is symmetrically provided with self-driving slide rails 6, the four self-driving slide rails 6 are fixedly connected with support plates 7, the upper end of the rotating shaft 2 penetrates the support plate 7 and is rotatably connected with the inner wall of the support plate 7 through a bearing, the lower movement of the sliding block on the self-driving slide rail 6 drives the lower movement of the support plate 7, thereby driving the rotating shaft 2 to move down.

[0056] As Figure 2 shown, in order to drive the rotating shaft 2 to rotate, a driving motor 8 is fixedly installed on the upper surface of the support plate 7, one end of the output shaft of the driving motor 8 extends into the support plate 7 and is connected with a driving gear 9 through a fixed sleeve, a driven gear 10 is fixedly connected with the surface of the rotating shaft 2 in the support plate 7, the surface of the driving gear 9 is engaged with the surface of the driven gear 10, the driving motor 8 output shaft is driven to rotate the driving gear 9, the rotation of the driving gear 9 drives the driven gear 10 to rotate through the engagement with the driven gear 10, and the rotation of the driven gear 10 drives the rotating shaft 2 to rotate.

[0057] As Figures 1-4 and Figures 11-13As shown, in order to detect the soil quality of the hole side wall, the hole side wall is statically pressed, and the detection static pressure mechanism comprises a support shell 3 symmetrically arranged on the surface of the rotating shaft 2, a servo motor 31 fixedly installed on the inner wall of the support shell 3, a screw rod 32 fixedly connected to one end of the output shaft of the servo motor 31, one end of the screw rod 32 being installed on the inner wall of the support shell 3 through a bearing, a threaded connection pipe 33 being connected to the surface of the screw rod 32, the surface of the threaded connection pipe 33 being slidably connected with the inner wall of the support shell 3, a pressure sensor 34 being fixedly installed on one end of the threaded connection pipe 33 away from the support shell 3, a static pressure plate 35 being fixedly connected to one end of the pressure sensor 34 away from the threaded connection pipe 33, the screw rod 32 being driven to rotate by the rotation of the output shaft of the servo motor 31, the threaded connection pipe 33 being driven to move along the inner wall of the support shell 3 by the rotation of the screw rod 32, the threaded connection pipe 33 being driven to move by the pressure sensor 34 to contact the hole side wall with the static pressure plate 35, and the static pressure plate 35 being compacted on the soil quality of the hole side wall, so as to detect the soil quality of the hole side wall by the pressure sensor 34, and find out the weak part of the soil quality.

[0058] By setting the detection static pressure mechanism, the soil quality of the hole side wall is easily pressed and detected, which not only facilitates the reinforcement of the hole side wall, but also easily finds the weak part of the soil quality of the hole side wall, so as to facilitate the cement spraying mechanism to spray and reinforce the weak part of the soil quality.

[0059] As shown in the figure, Figures 1-10 In order to clean the clear water on the compacted hole side wall, the clear water cleaning mechanism comprises a sleeve 4 symmetrically arranged on the surface of the rotating shaft 2, a threaded sleeve 41 slidably connected to the inner wall of the sleeve 4, a concave scraper 42 fixedly connected to one end of the threaded sleeve 41 away from the sleeve 4, a water-absorbing sponge 43 slidably inserted into the inner surface of the concave scraper 42, and a water storage tank body 49 fixedly connected to the lower end of the rotating shaft 2, the lower end of the water storage tank body 49 being tapered, facilitating the water storage tank body 49 to extend into the hole, and the concave scraper 42 scraping the clear water and dropping along the surface of the concave scraper 42 into the water storage tank body 49 with the rotation of the rotating shaft 2, and the water-absorbing sponge 43 absorbing the residual clear water on the side wall.

[0060] As shown in the figure, Figures 6-10As shown, in order to make the threaded sleeve 41 and the sleeve 4 fixed, so as to facilitate the installation of the concave scraper 42 and the water absorption sponge 43 on the sleeve 4, a push cylinder 44 is fixedly installed on the inner wall of the sleeve 4, the piston rod of the push cylinder 44 is fixedly connected with a concave sleeve 45, the concave sleeve 45 is located in the sleeve 4, and the inner wall of the concave sleeve 45 is screwed with the outer surface of the threaded sleeve 41, the inner side wall of the concave sleeve 45 is fixedly installed with an elastic tube clamp 46, the surface of the elastic tube clamp 46 is movably sleeved with a threaded telescopic sleeve 47, the inner wall of the threaded sleeve 41 is screwed with the surface of the threaded telescopic sleeve 47, the inner side wall of the threaded sleeve 41 is fixedly connected with a connecting column 48, one end of the connecting column 48 is slidably connected with the inner wall of the elastic tube clamp 46, by inserting the threaded sleeve 41 into the sleeve 4, and screwing the inner and outer threads on the threaded sleeve 41 with the threads on the threaded telescopic sleeve 47 and the concave sleeve 45 respectively, and then driving the elastic tube clamp 46 to shrink by the threaded telescopic sleeve 47 to clamp the connecting column 48, the threaded sleeve 41 is fixed in the sleeve 4 by fixing the connecting column 48, and the effect of facilitating the disassembly and assembly of the threaded sleeve 41 is achieved.

[0061] By setting the clear water cleaning mechanism, the clear water generated during the drilling process is scraped and absorbed, the efficiency of the shotcrete is improved, the hole side wall is reinforced, and the hole collapse is prevented. At the same time, the elastic clamp is clamped on the connecting column 48 by the threaded connection of the threaded sleeve 41, the concave sleeve 45 and the threaded telescopic sleeve 47, so that the concave scraper 42 and the water absorption sponge 43 are installed on the sleeve 4 by the threaded sleeve 41, and the threaded sleeve 41 is convenient to disassemble and replace.

[0062] As shown in the figure, Figures 1-4 In order to reinforce the weak soil of the cleaned hole side wall, the cement shotcrete mechanism includes two branch pipes 5 symmetrically arranged on the surface of the rotating shaft 2, the two branch pipes 5 are fixedly connected with a cement pipe 51 at one end close to the rotating shaft 2, and the two branch pipes 5 are fixedly installed with a nozzle 52 at one end away from the rotating shaft 2, the inner wall of the rotating shaft 2 is provided with a cavity 53, the free ends of the two cement pipes 51 extend to the outer surface of the rotating shaft 2 through the cavity 53, and the surfaces of the two cement pipes 51 are provided with electromagnetic valves 54. When the rotating shaft 2 drives the nozzle 52 to rotate to the weak soil of the hole side wall, the electromagnetic valve 54 is opened, the slurry enters the branch pipe 5 through the cement pipe 51, and the slurry is sprayed out through the nozzle 52 on the branch pipe 5 to reinforce it.

[0063] Working principle: in use, first take out the drill bit, drive walking support 1 to the hole, and make the rotating shaft 2 above the hole, then start the self-driving slide rail 6, the lower moving of the slider on the self-driving slide rail 6 drives the lower moving of the support plate 7, so as to drive the rotating shaft 2 to move down into the hole, and after moving down for a distance, start the servo motor 31, the rotation of the output shaft of the servo motor 31 drives the rotation of the screw rod 32, the rotation of the screw rod 32 drives the threaded connection pipe 33 to move out along the inner wall of the support shell 3, the moving out of the threaded connection pipe 33 drives the static pressure plate 35 to contact the hole wall through the pressure sensor 34, and the static pressure plate 35 compacts the soil on the hole wall;

[0064] Then start the drive motor 8, the rotation of the output shaft of the drive motor 8 drives the driving gear 9, the rotation of the driving gear 9 drives the driven gear 10 through the meshing with the driven gear 10, the rotation of the driven gear 10 drives the rotating shaft 2 to rotate, so that the rotating shaft 2 rotates at a certain frequency, which is convenient for the static pressure plate 35 to perform static pressure reinforcement around the hole wall;

[0065] After the static pressure reinforcement is completed, the rotating shaft 2 stops rotating, the lower moving of the slider on the self-driving slide rail 6 drives the clear water cleaning mechanism to the layer compacted by the static pressure plate 35, and then starts the push cylinder 44, the extension of the piston rod of the push cylinder 44 drives the concave sleeve 45 to move out along the inner wall of the sleeve pipe 4, so as to drive the concave scraper 42 and the water absorption sponge 43 to contact the hole wall through the threaded sleeve 41, and the rotation of the rotating shaft 2 drives the concave scraper 42 and the water absorption sponge 43 to scrape off and absorb the clear water on the hole wall, the clear water scraped off by the concave scraper 42 falls into the water storage tank 49, and after the rotating shaft 2 rotates for one round, the rotating shaft 2 stops rotating;

[0066] Then the lower moving of the slider on the self-driving slide rail 6 drives the cement jet grouting mechanism to the layer where the clear water is cleaned, and in the process of rotating the rotating shaft 2, the electromagnetic valve 54 on the corresponding cement pipe 51 is opened when the nozzle 52 is located at the weak soil on the hole wall, so that the slurry enters the branch pipe 5 connected with the cement pipe 51 through the cement pipe 51, and then is sprayed out through the nozzle 52 on the branch pipe 5 to spray and reinforce the weak soil on the hole wall.

[0067] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A method for constructing large-diameter pile foundation anti-collapse holes in a full sand layer, characterized by: The construction method of the large-diameter pile foundation anti-collapse hole in the full sand layer includes: S1. Determine the location and size of the pile foundation and mark the construction points; S2. Use appropriate mechanical equipment to dig the pile foundation holes according to the design requirements, digging only a small section of the hole each time; S3, after the hole of the subsection is excavated, the drill bit is taken out, and the rotating shaft (2) is inserted into the hole through the walking bracket (1), and the static pressure mechanism is conveniently detected under the rotation of the rotating shaft (2) to measure and reinforce the soil on the side wall of the hole; S4. After the reinforcement is completed, the rotating shaft (2) is driven to drive the static pressure detection mechanism to move downward for a distance, so that the clear water cleaning mechanism is located at the layer where the static pressure detection mechanism was previously located, so that the clear water cleaning mechanism can absorb and scrape off the clear water on the side wall of the hole under the rotation of the rotating shaft (2); S5, then driving the rotating shaft (2) to drive the clear water cleaning mechanism to move downward for a distance, so that the cement spraying mechanism is located at the layer where the clear water cleaning mechanism was previously located, and spraying reinforcement treatment is performed on the weak points of the soil detected by the static pressure detection mechanism under the rotation of the rotating shaft (2); S6, repeat the above steps S2-S5 until the hole excavation is completed; The cement spraying mechanism comprises branch pipes (5) symmetrically distributed on the surface of the rotating shaft (2), one end of the two branch pipes (5) close to the rotating shaft (2) is fixedly connected to a cement pipe (51), and one end of the two branch pipes (5) away from the rotating shaft (2) is fixedly installed with a nozzle (52), the inner wall of the rotating shaft (2) is provided with a cavity (53), the free ends of the two cement pipes (51) extend to the outer surface of the rotating shaft (2) through the cavity (53), and the surfaces of the two cement pipes (51) are provided with a solenoid valve (54); The clear water cleaning mechanism comprises a sleeve (4) symmetrically distributed on the surface of the rotating shaft (2), the inner wall of the sleeve (4) being slidably connected to a threaded sleeve (41), an end of the threaded sleeve (41) away from the sleeve (4) being fixedly connected to a concave scraper (42), and the inner surface of the concave scraper (42) being slidably plugged with a water-absorbing sponge (43); A pushing cylinder (44) is fixedly mounted on the inner wall of the sleeve (4), one end of the piston rod of the pushing cylinder (44) is fixedly connected to a concave sleeve (45), the concave sleeve (45) is located in the sleeve (4), and the inner wall of the concave sleeve (45) is threadedly connected to the outer surface of the threaded sleeve (41); An elastic pipe clamp (46) is fixedly mounted on the inner side wall of the concave sleeve (45), a threaded telescopic sleeve (47) is movably sleeved on the surface of the elastic pipe clamp (46), the inner wall of the threaded sleeve (41) is threadedly connected to the surface of the threaded telescopic sleeve (47), a connecting column (48) is fixedly connected to the inner side wall of the threaded sleeve (41), and one end of the connecting column (48) is slidably connected to the inner wall of the elastic pipe clamp (46); The static pressure detection mechanism comprises a support shell (3) symmetrically distributed on the surface of the rotating shaft (2), a servo motor (31) is fixedly mounted on the inner wall of the support shell (3), one end of the output shaft of the servo motor (31) is fixedly connected to a screw (32), one end of the screw (32) is mounted on the inner wall of the support shell (3) through a bearing, a threaded sleeve (41) on the surface of the screw (32) is connected to a threaded connecting pipe (33), and the surface of the threaded connecting pipe (33) is slidably engaged with the inner wall of the support shell (3); A pressure sensor (34) is fixedly mounted on one end of the threaded connection pipe (33) away from the support shell (3), and a static pressure plate (35) is fixedly connected to one end of the pressure sensor (34) away from the threaded connection pipe (33).

2. The method for constructing a large-diameter pile foundation anti-collapse hole in a full sand layer according to claim 1, characterized in that: The inner surface of the walking bracket (1) is symmetrically provided with self-driving slide rails (6), and the sliders on the four self-driving slide rails (6) are fixedly connected to the support plate (7). The upper end of the rotating shaft (2) passes through the support plate (7) and is rotatably connected to the inner wall of the support plate (7) through a bearing.

3. The method for constructing a large-diameter pile foundation anti-collapse hole in a full sand layer according to claim 2, characterized in that: A driving motor (8) is fixedly mounted on the upper surface of the support plate (7), one end of the output shaft of the driving motor (8) extends into the support plate (7) and is fixedly sleeved with a driving gear (9), and a surface of the rotating shaft (2) located inside the support plate (7) is fixedly sleeved with a driven gear (10), and the surface of the driving gear (9) meshes with the surface of the driven gear (10).

4. The method for constructing a large-diameter pile foundation anti-collapse hole in a full sand layer according to claim 1, characterized in that: The lower end of the rotating shaft (2) is fixedly connected to a water storage tank body (49), and the lower end of the water storage tank body (49) is configured to be conical.

Images