Construction method of combined hole of complex geological pile foundation

Abstract

This invention relates to a method for constructing pile foundations in complex geological conditions, employing a suspended operating platform and steel casing deformation treatment technology. Multiple steel supports are spaced at different heights within the deformed steel casing, and a suspended operating platform is installed to handle steel casing deformation accidents during pile foundation construction in complex environments. The steel supports are reusable, improving the efficiency and economy of accident handling. A retrieval technology for drill bits falling into down-the-hole hammer boreholes is proposed, and a drill bit retrieval device is designed, increasing the success rate of drill bit capture. The retrieval device is equipped with water passage holes and drainage outlets to reduce the buoyancy of the entire device. The placement of a wireless high-definition camera can be adjusted according to the diameter of the cast-in-place pile and the location of the probe hole, enabling high-definition video recording of the pile foundation concrete pouring quality.

Description

Technical Field

[0001] This invention belongs to the field of pile foundation construction under complex geological conditions, and particularly relates to a method for combined hole-forming construction of pile foundations in complex geological conditions. Background Technology

[0002] With the increasing number of large-scale projects, the construction environment is becoming increasingly complex, with diverse and variable geological conditions, such as soft soil, contaminated soil, rock, pebble layers, and boulder layers. These complex geological conditions pose significant challenges to traditional pile foundation construction methods, resulting in problems such as high construction difficulty, low efficiency, high cost, and numerous safety hazards.

[0003] In complex geological conditions, a single construction method is often ineffective. Furthermore, due to the special nature of the geology, deformation of the steel casing is prone to occur during construction, and the quality of concrete pouring is particularly important under such geological conditions.

[0004] Given the complex construction conditions, high construction quality, and tight construction schedule of engineering projects, this paper proposes an innovative method for constructing combined boreholes for complex geological pile foundations that is efficient, of high quality, and low in safety risks. This method is of great significance for improving the construction quality of bored piles under complex geological conditions. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method for constructing complex geological pile foundations by drilling.

[0006] The complex geological pile foundation combined drilling construction system includes deformable steel casing, steel support, hanging beam, hanging operation platform, retrieval device, cast-in-place pile, wireless high-definition camera and camera hanging device;

[0007] The steel supports are fixed at different heights inside the deformed steel casing, the hanging beam is fixed at the top of the deformed steel casing, the hanging operating platform is suspended inside the deformed steel casing, and the top of the hanging operating platform is connected to the hanging beam.

[0008] The bottom inner side of the retrieval device is equipped with a drill-receiving rod via a spring. The retrieval device is inserted into the upper end of the drill bit, and the drill-receiving rod is embedded in the drill bit groove to retrieve the drill bit.

[0009] The camera mounting device is installed on the top of the cast-in-place pile, and the wireless high-definition camera is suspended in the detection hole of the cast-in-place pile by a hanging rope.

[0010] Preferably, the top of the deformable steel casing is provided with a perforation reinforcing hoop, a hanging beam is provided on the perforation reinforcing hoop, a fixing plate is provided at the end of the hanging beam, the fixing plate is connected to the perforation reinforcing hoop by bolts, a pad is provided in the gap between the fixing plate and the perforation reinforcing hoop, a slide rail is provided on the top surface of the hanging beam, several synchronous motors are provided on the slide rail, and ropes are provided under the synchronous motors for connecting to the hanging operating platform.

[0011] Preferably, the deformable steel casing is equipped with multiple steel supports inside. The steel supports include standardized steel supports, connecting sleeves, and rear support rods. The length of the rear support rods is determined according to the deformation of the deformable steel casing. The lower part of the hanging beam is provided with ear plates, and the rope passes through the ear plates and is provided with a buffer hook at the bottom. A hanging operating platform is provided below the buffer hook. A slag receiving platform is provided at the bottom of the steel casing. The standardized steel supports are provided with an outer arc-shaped channel steel on the outside and an inner arc-shaped steel pipe on the inside. A stiffening plate is provided between the outer arc-shaped channel steel and the inner arc-shaped steel pipe.

[0012] Preferably, the top of the retrieval device is equipped with a cover plate, on which a connector and a water passage hole are provided. The lower part of the retrieval device is connected to a rear flared mouth through a fixing ring. A drainage port is provided on the rear flared mouth. The retrieval device is a straight hexagonal cylinder with a groove on the inner side of the bottom. A spring is installed in the groove. A drill-connecting rod is installed at the end of the spring. A rotating rod is installed on the drill-connecting rod. A side sliding plate is installed on the rotating rod. The drill-connecting rod is embedded in the drill bit groove of the drill bit to achieve drill bit retrieval.

[0013] Preferably, the cast-in-place pile is provided with a detection hole, and a hanging auxiliary rail is provided on the outside of the cast-in-place pile. The hanging auxiliary rail is provided with a groove to form a track, and a column is provided on the track. A steel distribution beam is provided on the column, and a crossbeam limiting plate is provided on the steel distribution beam. A double channel steel crossbeam is provided between the crossbeam limiting plates. The double channel steel crossbeam extends above the detection hole. A pulley baffle is provided on the extension direction of the double channel steel crossbeam. A channel steel baffle is provided at the end of the double channel steel crossbeam. A motor base and a rope buffer plate are provided at the end of the channel steel baffle away from the detection hole. A rope motor is provided on the motor base, and a diagonal brace is provided between the column and the motor base.

[0014] Preferably, the rope motor is used to pull the suspension rope. A front-to-back moving square steel is provided on the double channel steel beam. One end of the suspension rope is connected to the rope motor, and the other end extends through the suspension rope buffer plate on the channel steel baffle and extends vertically downward into the front-to-back moving square steel. A wireless high-definition camera is installed at the bottom of the suspension rope, and a pulley is installed at the bottom of the front-to-back moving square steel. The pulley moves between the pulley baffle.

[0015] This construction system employs a complex geological pile foundation combination borehole construction method, which includes the following steps:

[0016] Step 1: Use a clustered ring-shaped core cutting down-the-hole hammer to form the pile hole;

[0017] Step 2: Lower the steel casing into the pile hole, reinforce the deformed steel casing with grout around the pile, install a hanging beam on the top of the deformed steel casing, lower the hanging operating platform, and install steel supports; set up a slag receiving platform below the deformed section, cut the deformed section of the deformed steel casing, remove the grout, chisel the pile perimeter into a circle, and after the perimeter inspection is qualified, connect a circular steel plate to complete the steel casing;

[0018] Step 3: Grout the steel casing to obtain the cast-in-place pile, construct the inspection hole, and then install the camera hanging device. Adjust the camera hanging device according to the position of the inspection hole, and lower the wireless high-definition camera into the inspection hole to inspect the hole formation quality.

[0019] As a preferred option, after the drill bit of the down-the-hole hammer falls, a retrieval device is installed on the drill rod. The retrieval device is connected to the drill rod through a connector. The retrieval device covers the top of the drill bit as the drill rod falls. During the fall, the spring carries the drill receiving rod into the groove of the drill bit to complete the capture of the drill bit. The drill rod is then lifted to retrieve the drill bit.

[0020] The beneficial effects of this invention are:

[0021] 1) This invention adopts a suspended operating platform for treating steel casing deformation. Multiple steel supports are set at different heights inside the deformed steel casing, and a suspended operating platform is set up for handling steel casing deformation accidents during pile foundation construction in complex environments. The steel supports can be reused, which improves the construction efficiency and economy of accident handling.

[0022] 2) This invention adopts clustered ring cutting core drilling down-the-hole hammer technology, which has the characteristics of high efficiency, low energy consumption, no pollution and high hole quality. It also proposes a retrieval technology to deal with the drill bit falling into the hole of the down-the-hole hammer and designs a drill bit retrieval device to improve the success rate of drill bit capture. The retrieval device is equipped with water passage holes and drainage outlets to reduce the buoyancy of the entire device.

[0023] 4) This invention developed a camera hanging device, which can adjust the lowering position of the wireless high-definition camera according to the diameter of the cast-in-place pile and the position of the detection hole, realizing high-definition video recording of the concrete pouring quality of the pile foundation. The imaging unfolded diagram can be used to assist in the identification of pile defects and pile length detection. Attached Figure Description

[0024] Figure 1 This is a three-dimensional schematic diagram of the deformation treatment of the steel casing;

[0025] Figure 2 It is a diagram showing the treatment of deformation of the steel casing;

[0026] Figure 3 This is a schematic diagram of the deformation treatment of the steel casing;

[0027] Figure 4 This is a schematic diagram of the suspended operating platform structure;

[0028] Figure 5 This is a schematic diagram of a standardized steel support;

[0029] Figure 6 This is a schematic diagram of the salvage device;

[0030] Figure 7 This is a top view of the salvage device;

[0031] Figure 8 This is a schematic diagram of the cross-section of the salvage device;

[0032] Figure 9 This is a schematic diagram of a high-definition waterproof camera mounting device;

[0033] Figure 10 This is a schematic diagram of the end of a double-channel steel beam;

[0034] Figure 11 This is a schematic diagram of a square steel bar that moves back and forth.

[0035] The components include: 1. Deformed steel casing; 2. Orifice reinforcing hoop; 3. Synchronous motor; 4. Slide rail; 5. Standardized steel support; 6. Connecting sleeve; 7. Fixing plate; 8. Pad; 9. Hanging beam; 10. Rope; 11. Rear support rod; 12. Ear plate; 13. Buffer hook; 14. Hanging operating platform; 15. Slag receiving platform; 16. Inner arc-shaped steel pipe; 17. Stiffening plate; 18. Outer arc-shaped channel steel; 19. Drill bit; 20. Rear bell mouth; 21. Fixing ring; 22. Salvage device; 23. Water passage hole; 24. Joint; 25. 26. Drill bit groove; 27. Drain outlet; 28. Drilling rod; 29. ​​Side slide plate; 30. Rotating rod; 31. Spring; 32. Cast-in-place pile; 33. Suspension auxiliary track; 34. Detection hole; 35. Wireless high-definition camera; 36. Track; 37. Suspension rope; 38. Forward and backward moving square steel; 39. Pulley; 40. Suspension rope motor; 41. Column; 42. Double channel steel crossbeam; 43. Pulley baffle; 44. Suspension rope buffer plate; 45. Motor base; 46. Channel steel baffle; 47. Crossbeam limiting plate; 48. Diagonal brace; 49. Steel distribution beam. Detailed Implementation

[0036] The present invention will be further described below with reference to embodiments. The description of the embodiments below is only for the purpose of helping to understand the present invention. It should be noted that those skilled in the art can make several modifications to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0037] Example 1

[0038] As one example, such as Figures 1 to 11 As shown, this complex geological pile foundation combined drilling construction system includes deformable steel casing 1, steel support, suspended crossbeam 9, and suspended operating platform 14.

[0039] The steel supports are fixed at different heights inside the deformed steel casing 1, the hanging beam 9 is fixed at the top of the deformed steel casing 1, the hanging operating platform 14 is suspended inside the deformed steel casing 1, and the top of the hanging operating platform 14 is connected to the hanging beam 9.

[0040] The bottom inner side of the retrieval device 22 is provided with a drill-receiving round rod 27 via a spring 30. The retrieval device 22 is inserted into the upper end of the drill bit 19, and the drill-receiving round rod 27 is embedded in the drill bit groove 25 of the drill bit 19 to achieve the retrieval of the drill bit 19.

[0041] The camera mounting device is installed on the top of the cast-in-place pile 31. The camera mounting device suspends the wireless high-definition camera 34 in the detection hole 33 of the cast-in-place pile 31 through the hanging rope 36.

[0042] The deformable steel casing 1 is provided with a hole reinforcing hoop 2, a hanging beam 9 is provided on the hole reinforcing hoop 2, a fixing plate 7 is provided at the end of the hanging beam and is connected to the hole reinforcing hoop 2 by bolts, a pad 8 is provided in the gap between the two, a slide rail 4 is provided on the top surface of the hanging beam 9, two synchronous motors 3 are provided on the slide rail, and a rope 10 is provided under the synchronous motor.

[0043] The steel casing 1 is internally equipped with multiple steel supports, which consist of a standardized steel support 5, a connecting sleeve 6, and a rear support rod 11. The length of the rear support rod is determined according to the deformation of the steel casing. The rope 10 passes through the ear plate 12 at the bottom of the hanging beam. A buffer hook 13 is installed at the bottom, and a hanging operating platform 14 is installed below the buffer hook. A slag receiving platform 15 is installed at the bottom of the steel casing 1. The standardized steel support 5 has an outer arc-shaped channel steel 18 on the outside and an inner arc-shaped steel pipe 16 on the inside. A stiffening plate 17 is installed in the middle.

[0044] Example 2

[0045] As another embodiment, this embodiment two proposes, based on embodiment one, a more specific complex geological pile foundation combined drilling construction system, including a salvage device 22.

[0046] The retrieval device 22 is used for retrieving the down-the-hole hammer drill bit 19. The top of the retrieval device 22 is provided with a cover plate, and the cover plate is provided with a connector 24 and a water passage hole 23. The lower part is connected to a rear flared mouth 20 through a fixing ring 21. A drainage port 26 is provided on the rear flared mouth. The retrieval device 22 is a regular hexagon with a groove on the inner side of the bottom. A spring 30 is provided in the groove. A drill-connecting round rod 27 is provided at the end of the spring 30. A rotating rod 29 is provided on the drill-connecting round rod 27. A side sliding plate 28 is provided on the rotating rod 29. The drill-connecting round rod 27 is embedded in the drill bit groove 25 of the drill bit 19 to achieve the retrieval of the drill bit 19.

[0047] It should be noted that the parts in this embodiment that are the same as or similar to those in Embodiment 1 can be referred to each other, and will not be repeated in this application.

[0048] Example 3

[0049] As another embodiment, this embodiment three proposes, based on embodiment one, a more specific complex geological pile foundation combined drilling construction system, including cast-in-place piles 31, wireless high-definition cameras 34 and camera hanging devices.

[0050] The cast-in-place pile 31 is provided with a detection hole 33. A hanging auxiliary rail 32 is provided on the outside of the cast-in-place pile 31. A groove for rail 35 is provided on the hanging auxiliary rail. A column 40 is provided on rail 2=35. A steel distribution beam 48 is provided on the column. A crossbeam limiting plate 46 is provided on the steel distribution beam 48. A double channel steel crossbeam 41 is provided inside the crossbeam limiting plate. A pulley baffle 42 is provided on the double channel steel crossbeam 41. A channel steel baffle 45 is provided at the end of the double channel steel crossbeam 41. A motor base 44 and a rope buffer plate 43 are provided on the channel steel baffle 45. A rope motor 39 is provided on the motor base. A diagonal brace 47 is provided between the column 40 and the motor base 44.

[0051] The rope-hanging motor 39 is used to pull the suspension rope 36 along the double-channel steel crossbeam 41 of the suspension rope 36 to the front-rear moving square steel. Two rows of six suspension rope buffer plates 43 are installed inside the front-rear moving square steel 37. One end of the suspension rope 36 is connected to the rope-hanging motor 39, and the other end extends vertically downwards through the suspension rope buffer plate 43 on the channel steel baffle 45 into the front-rear moving square steel 37. A wireless high-definition camera 34 is installed at the bottom of the suspension rope, and a pulley 38 is installed at the bottom of the front-rear moving square steel 37, moving between pulley baffles 42. This assembly can move back and forth and circumferentially around the cast-in-place pile for high-definition imaging of the detection holes 33 at various locations.

[0052] Example 4

[0053] As another embodiment, this fourth embodiment proposes a method for constructing combined boreholes for complex geological pile foundations based on embodiments one to three:

[0054] Clustered Annular Core Cutting Down-the-Hole Hammer Drilling: High-pressure air drives a piston within the impactor to reciprocate at high frequency, driving a sub-hammer to break the rock strata. During drilling, the sub-hammer forms an annular groove in the rock strata. The columnar rock core within the annular groove is extracted as a whole using a clamping device inside the down-the-hole hammer, forming the pile hole. Simultaneously, the partially broken rock cuttings from the annular groove are collected in a cuttings collection cylinder through a cuttings return channel, achieving efficient cuttings removal.

[0055] Treatment of steel casing deformation: After the steel casing deforms, grouting reinforcement is carried out around the pile immediately. According to the deformation and the diameter of the deformed steel casing 1, a standardized steel support 5 is made. A reinforcing hoop 2 is installed at the top of the deformed steel casing 1. Then, a hanging beam 9 is installed. After filling with pads, it is fixed with a fixing plate. After installing a synchronous motor, a rope 10 and a hanging operating platform 14 are installed. The hanging operating platform 14 is lowered by the synchronous motor. After it is lowered to a suitable position, the standardized steel support 5 is installed. Then, a rear support rod 11 is installed in the connecting sleeve 6. The length of the rear support rod 11 is cut according to the deformation and welded to the deformed steel casing 1. One is set every 600mm. A slag receiving platform 15 is set at the end of the deformation. After the support is set, the deformed steel casing is gradually cut and the grout is removed. The pile perimeter is chiseled into a circle. After the circumference is qualified, a circular steel plate is connected to complete the steel casing. The debris falls to the slag receiving platform 15 and is then disposed of.

[0056] When a down-the-hole hammer drill bit 19 falls into the hole, a retrieval device 22 is installed on the drill rod and connected to the drill rod via a connector 24. The retrieval device 22 falls with the drill rod, and the side slide plate 28 first contacts the drill bit 19. Then, it falls along the rotating rod along the drill bit 19 structure, increasing the success rate of capturing the drill bit 19. During the fall, the spring 30 tightens the drill receiving rod 27. After the drill receiving rod 27 captures the drill bit groove 25, the spring 30 immediately pops out, thus completing the capture of the drill bit 19. The drill rod is then lifted to retrieve the drill bit 19. The flared opening 20 is used to increase the success rate of capturing the drill bit 19.

[0057] High-definition waterproof camera hole-forming quality inspection: After concrete pouring, a cast-in-place pile 31 is formed, and a construction inspection hole is constructed. Then, a hanging auxiliary track 32 is installed, followed by the installation of a column 40, a distribution beam 48, a double-channel steel beam 41 with a motor base 44, and a diagonal brace 47. Then, a rope motor 39 is installed. At the end of the double-channel steel beam 41, a front-to-back moving square steel 37 with pulleys 38 is installed and then a hanging rope 36 is inserted, ensuring that the hanging rope 36 is fully inserted into the hanging rope buffer plate 43. Then, a wireless high-definition camera 34 is installed under the hanging rope 36. The positions of the column 40 and the moving square steel 37 are adjusted according to the position of the inspection hole 33, and the wireless high-definition camera 34 is slowly lowered into the inspection hole 33 to achieve high-definition imaging inside the hole. The image data is then transmitted to a computer to achieve hole-forming quality inspection.

[0058] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

Claims

1. A construction structure for combined drilling of pile foundations in complex geological conditions, characterized in that, Includes deformable steel casing, steel support, hanging beam, hanging operating platform, salvage device, cast-in-place pile, wireless high-definition camera and camera hanging device; The steel supports are fixed at different heights inside the deformed steel casing, the hanging beam is fixed at the top of the deformed steel casing, the hanging operating platform is suspended inside the deformed steel casing, and the top of the hanging operating platform is connected to the hanging beam. The bottom inner side of the retrieval device is equipped with a drill-receiving rod via a spring. The retrieval device is inserted into the upper end of the drill bit, and the drill-receiving rod is embedded in the drill bit groove to retrieve the drill bit. The camera mounting device is installed on the top of the cast-in-place pile. The wireless high-definition camera is suspended in the detection hole of the cast-in-place pile by the hanging rope. The top of the deformable steel casing is provided with a hole reinforcing hoop, a hanging beam is provided on the hole reinforcing hoop, a fixing plate is provided at the end of the hanging beam, the fixing plate is connected to the hole reinforcing hoop by bolts, a pad is provided in the gap between the fixing plate and the hole reinforcing hoop, a slide rail is provided on the top surface of the hanging beam, several synchronous motors are provided on the slide rail, and ropes are provided under the synchronous motors for connecting to the hanging operation platform. The deformable steel casing is internally equipped with multiple steel supports, including fixed steel supports, connecting sleeves, and rear support rods. The length of the rear support rods is determined according to the deformation of the deformable steel casing. The lower part of the hanging beam is equipped with ear plates, through which ropes pass and with buffer hooks at the bottom. A hanging operating platform is installed below the buffer hooks. A slag receiving platform is installed at the bottom of the steel casing. The fixed steel supports have an outer arc-shaped channel steel on the outside and an inner arc-shaped steel pipe on the inside. A stiffening plate is installed between the outer arc-shaped channel steel and the inner arc-shaped steel pipe. The top of the retrieval device is equipped with a cover plate, on which a connector and a water passage hole are provided. The lower part of the retrieval device is connected to a rear flared mouth through a fixing ring. A drainage port is provided on the rear flared mouth. The retrieval device is a straight hexagonal cylinder with a groove on the inner side of the bottom. A spring is installed in the groove. A drill-connecting rod is installed at the end of the spring. A rotating rod is installed on the drill-connecting rod. A side sliding plate is installed on the rotating rod. The drill-connecting rod is embedded in the drill bit groove of the drill bit to achieve drill bit retrieval.

2. The complex geological pile foundation combined drilling construction structure according to claim 1, characterized in that, The cast-in-place pile is equipped with a detection hole. A hanging auxiliary rail is installed on the outside of the cast-in-place pile. The hanging auxiliary rail has a groove to form a track. A column is installed on the track. A steel distribution beam is installed on the column. A crossbeam limiting plate is installed on the steel distribution beam. A double channel steel crossbeam is installed between the crossbeam limiting plates. The double channel steel crossbeam extends above the detection hole. A pulley baffle is installed along the length of the double channel steel crossbeam. A channel steel baffle is installed at the end of the double channel steel crossbeam. A motor base and a rope buffer plate are installed at the end of the channel steel baffle away from the detection hole. A rope motor is installed on the motor base. A diagonal brace is installed between the column and the motor base.

3. The complex geological pile foundation combined drilling construction structure according to claim 2, characterized in that, The rope motor is used to pull the hoisting rope. A front-to-back moving square steel is provided on the double channel steel beam. One end of the hoisting rope is connected to the rope motor, and the other end extends through the hoisting rope buffer plate on the channel steel baffle and extends vertically downward into the front-to-back moving square steel. A wireless high-definition camera is installed at the bottom of the hoisting rope, and a pulley is installed at the bottom of the front-to-back moving square steel. The pulley moves between the pulley baffle.

4. The method for constructing complex geological pile foundations using the construction structure described in claim 1, characterized in that, Includes the following steps: Step 1: Use a clustered ring-shaped core cutting down-the-hole hammer to form the pile hole; Step 2: Lower the steel casing into the pile hole, reinforce the deformed steel casing with grout around the pile, install a hanging beam on the top of the deformed steel casing, lower the hanging operating platform, and install steel supports; set up a slag receiving platform below the deformed section, cut the deformed section of the deformed steel casing, remove the grout, chisel the pile perimeter into a circle, and after the perimeter inspection is qualified, connect a circular steel plate to complete the steel casing; Step 3: Grout the steel casing to obtain the cast-in-place pile, construct the inspection hole, and then install the camera hanging device. Adjust the camera hanging device according to the position of the inspection hole, and lower the wireless high-definition camera into the inspection hole to inspect the hole formation quality.

5. The method for constructing combined boreholes for complex geological pile foundations according to claim 4, characterized in that, After the drill bit of the down-the-hole hammer falls, a retrieval device is installed on the drill rod. The retrieval device is connected to the drill rod through a connector. The retrieval device covers the top of the drill bit as the drill rod falls. During the fall, the spring carries the drill receiving rod into the groove of the drill bit to complete the capture of the drill bit. The drill rod is then lifted to retrieve the drill bit.

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