Cast-in-place pile construction equipment and method for treating sand-bearing layer of house building foundation

Abstract

The invention discloses cast-in-place pile construction equipment and a cast-in-place pile construction method for treating a sand-bearing layer of a house building foundation. The equipment comprises a spiral drilling machine device, a power mechanism of the spiral drilling machine device is connected with an embedded type drilling unit, the embedded type drilling unit comprises a built-in main drilling rod and a drilling barrel arranged outside the main drilling rod in a sleeving mode, large spiral blades are arranged on the outer surface of the main drilling rod, and small spiral blades are arranged on the outer wall of the drilling barrel. The main drill rod and the drill barrel are coaxially arranged, the power mechanism is configured to drive the main drill rod and the drill barrel to rotate, and the lower end of the main drill rod penetrates through the bottom of the drill barrel to form an extension section. The first method and the second method both comprise the steps of drilling a hole through the main drill rod, expanding the diameter of the drill barrel, taking out the main drill rod and pouring, the first method is synchronous drilling and expanding, and the second method is intermittent drilling and expanding. The sand-containing layer pile hole collapse can be avoided, meanwhile, the construction difficulty is reduced, and the quality of the cast-in-place pile is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of cast-in-place pile construction, and in particular to cast-in-place pile construction equipment and a method for processing a sand-containing layer in a building foundation. Background Art

[0002] The construction technology of existing long spiral bored pile is:

[0003] 1. The long screw drill rotates and drills to bring out the soil in the pile hole to the designed depth;

[0004] 2. After the hole is formed, pull out the pile pipe and use the cohesive force of the soil to prevent the side wall of the hole from collapsing, or use special equipment and technology to protect the wall with mud;

[0005] 3. Pour concrete and vibrate to form piles.

[0006] The disadvantage of this construction process is that the protection effect of the soil on the side wall of the pile hole is not ideal, especially when the groundwater level is high and the foundation soil layer contains a lot of sand, the hole wall collapse is more serious. How to drill and pour the bored pile in the sand-containing layer has become a problem that must be solved. Summary of the invention

[0007] The invention provides a bored pile construction device and method for processing a sand-containing layer in a building foundation, aiming to improve the problems of thick sand-containing layer, easy collapse of pile holes, high difficulty in casting bored piles, and poor quality of bored piles after forming.

[0008] To solve the above problems, the technical solution of the present invention is:

[0009] A cast-in-place pile construction device for processing sand-containing layers, comprising a spiral drilling device, wherein a power mechanism of the spiral drilling device is connected to a sleeve-type drilling unit;

[0010] The sleeve-type drilling unit comprises a built-in main drill rod and a drill barrel sleeved outside the main drill rod, the outer surface of the main drill rod is provided with a large spiral blade, and the outer wall of the drill barrel is provided with a small spiral blade;

[0011] The main drill rod and the drill barrel are coaxially arranged, the power mechanism is configured to drive the rotation of the main drill rod and the drill barrel, and the lower end of the main drill rod passes through the bottom of the drill barrel to form an extension section.

[0012] Preferably, the power mechanism drives the main drill rod and the drill barrel synchronously or drives the main drill rod and the drill barrel intermittently.

[0013] Preferably, the auger drilling device comprises a first auger drilling body, the power mechanism comprises a first driving motor, and the top end of the first driving motor is fixedly connected to a first moving seat;

[0014] A linear guide rail arranged longitudinally is provided on one side of the first movable seat, the first movable seat is slidably connected to the linear guide rail, a guide wheel mechanism is provided at the top of the linear guide rail, and the top of the first movable seat is connected to the winch of the first spiral drilling machine body through a wire rope bypassing the guide wheel mechanism.

[0015] Preferably, the structure of the power mechanism synchronously driving the main drill rod and the drill barrel is: a first connecting barrel is coaxially provided at the top of the drill barrel, a first outer flange is provided at the bottom edge of the first connecting barrel, and a second outer flange is provided at the top edge of the drill barrel;

[0016] The first outer flange and the second outer flange are fixedly connected by a first bolt and nut assembly, the top end of the first connecting tube is fixedly connected to the outer wall of the main drill pipe by a plurality of equally spaced stiffening connecting plates, and the top end of the main drill pipe is fixedly connected to the output shaft end of the first drive motor.

[0017] Preferably, the auger drilling device further comprises a second auger drilling body disposed on the opposite side of the first auger drilling body, and the power mechanism further comprises a second drive motor;

[0018] The structure of the power mechanism intermittently driving the main drill rod and the drill barrel is as follows: the linear guides of the first auger drill body and the second auger drill body are symmetrically arranged on both sides of the pile hole, the two ends of the first moving seat are respectively slidably connected with the corresponding linear guides, the top of the drill barrel is also provided with a second connecting tube, the bottom end of the second connecting tube is provided with a third outer flange, and the third outer flange is fixedly connected to the second outer flange at the top of the drill barrel through a second bolt and nut assembly;

[0019] The second moving seats are slidably connected to the two linear guide rails below the first moving seat, and a connecting plate is connected between the two second moving seats in the transverse direction. The connecting plate is provided with a through hole for passing the second connecting tube, and a first fixing ring is coaxially fixed on the lower surface of the connecting plate where the outer edge of the lower port of the through hole is located;

[0020] The outer wall of the second connecting cylinder is coaxially fixedly connected with a second fixing ring, the first fixing ring and the second fixing ring are connected via a tension bearing, the outer wall of the second connecting cylinder below the second fixing ring is coaxially fixedly connected with a driven gear, and the lower end of the connecting plate is fixedly connected to the second driving motor;

[0021] The output shaft of the second driving motor is fixedly connected with a driving gear, and the driving gear is meshedly connected with a driven gear. An electric telescopic mechanism is also longitudinally connected between the first moving seat and the second moving seat.

[0022] Preferably, the outer end of the small spiral blade is slidably matched with the inner wall of the drill tube; the stroke of the electric telescopic mechanism is the same as the length of the extension section.

[0023] Preferably, the drill barrel is also equipped with a hammer head, which includes a column and a fourth outer flange arranged at the bottom of the column, the fourth outer flange is fixedly connected to the second outer flange by a third bolt and nut assembly, and a fixing block is provided at the top of the column.

[0024] Preferably, the method includes a method 1 in which a power mechanism synchronously drives the main drill rod and the drill barrel, and a method 2 in which a power mechanism intermittently drives the main drill rod and the drill barrel.

[0025] Preferably, the method 1 comprises the following steps:

[0026] (11) The drill tube is sleeved outside the main drill rod, the top end of the drill tube is fixedly connected to the outer wall of the main drill rod through the first connecting tube, and the first driving motor is started to start drilling; during the drilling process, the main drill rod is used to drill the main body of the pile hole, and the drill tube is used to expand the diameter of the hole drilled by the main drill rod by screwing into the outer wall of the hole, and finally to form a pile hole of a desired size;

[0027] (12) When the drill bit of the main drill rod reaches the depth of the bottom end of the pile hole, the first drive motor is stopped, the first bolt and nut assembly is removed, and the main drill rod together with the first connecting tube is taken out of the drill tube;

[0028] (13) Connect a hammer head to the top of the drill tube and hammer the drill tube to the depth of the bottom of the pile hole through the hammering equipment;

[0029] (14) Remove the hammer head, pour concrete in the drill tube and cure it;

[0030] (15) Remove the drill tube by lifting equipment and pour concrete slurry into the gap between the bored pile and the pile hole;

[0031] The second method comprises the following steps:

[0032] (21) A first auger drill body and a second auger drill body are arranged on both sides of the preset pile hole position, so that the two ends of the first movable seat are slidably connected to the two linear guide rails, and the two second movable seats are fixedly connected by a connecting plate. The main drill rod passes through the through hole, and the drill barrel is sleeved outside the main drill rod and connected to the drill barrel through the second connecting barrel. The second connecting barrel passes through the through hole, and the second connecting barrel is rotatably connected to the connecting plate through a tension bearing. At this time, the driving gear is meshed and connected with the driven gear;

[0033] (22) The first drive motor is started first. When the extension section completely enters the soil, the first drive motor is stopped and the second drive motor is started to rotate the drill tube downward along the inner wall of the hole drilled by the main drill rod and expand the hole diameter. During this process, the electric telescopic mechanism is extended until the stroke reaches the length of the extension section and the second drive motor is stopped;

[0034] Then, the first driving motor is started again to make the main drill rod drill a hole of the extended length, and then the second driving motor is started again to expand the diameter, and this cycle is repeated to finally form the pile hole;

[0035] (23) Release the second bolt and nut assembly, remove the main drill rod and the second connecting tube on its outer side from the construction site, pour concrete in the drill tube, and after curing and forming, remove the drill tube and pour concrete slurry into the gap between the outer wall of the bored pile and the pile hole.

[0036] The invention discloses a cast-in-place pile construction device and method for treating a sand-containing layer in a building foundation, which has the following beneficial effects:

[0037] The present invention provides a bored pile construction device and method for processing a sand-containing layer in a building foundation, which solves the problems of easy collapse of pile holes, high difficulty in casting bored piles, and poor quality of bored piles after forming due to a thick sand-containing layer during bored pile construction. The present invention can avoid the collapse of pile holes, reduce the construction difficulty, and ensure the quality of bored piles. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 , a schematic diagram of the equipment structure corresponding to the method of the present invention;

[0039] Figure 2 , a schematic diagram of a partial cross-sectional structure of a device corresponding to the method of the present invention;

[0040] Figure 3 , a schematic diagram of the structure after the main drill rod is taken out of the method 1 of the present invention;

[0041] Figure 4 , a schematic diagram of the structure of hammering the drill pipe to the bottom of the pile hole in the first method of the present invention;

[0042] Figure 5 , a schematic diagram of the structure after the hammer head is removed in the method 1 of the present invention;

[0043] Figure 6 , a schematic diagram of the structure of a cast-in-place pile after casting in the method of the present invention;

[0044] Figure 7 , a schematic diagram of the enlarged local structure of A of the present invention;

[0045] Figure 8 , a schematic diagram of the structure of the implementation method of the second method of the present invention;

[0046] Fig. 9 , a schematic diagram of the enlarged local structure of location B of the present invention.

[0047] 1. Soil at the construction location; 2. The main body of the first spiral drill; 3. The winch; 4. The guide wheel mechanism; 5. The wire rope; 6. The first moving seat; 7. The first driving motor; 8. The first connecting tube; 9. The first outer flange; 10. The second outer flange; 11. The stiffening connecting plate; 12. The main drill rod; 13. The drill tube; 14. The small spiral blade; 15. The large spiral blade; 16. The drill bit; 17. The hole; 18. The pile hole; 19. The column; 20. The fixed block; 21. The fourth outer flange; 22. The cast-in-place pile; 23. The linear guide rail; 24. The second moving seat; 25. The electric telescopic mechanism; 26. The second connecting tube; 27. The first fixing ring; 28. The second fixing ring; 29. ​​The tension bearing; 30. The through hole; 31. The second driving motor; 32. The driving gear; 33. The driven gear. DETAILED DESCRIPTION

[0048] The following describes in detail the implementation mode of the present invention in a step-by-step manner. The description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0049] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “top”, “bottom”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the purpose of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, and a specific direction structure and operation, and therefore cannot be understood as a limitation on the present invention.

[0050] Example 1

[0051] In the initial embodiment, the present invention is a cast-in-place pile construction equipment for treating sand-containing layers, such as Figure 1-9 As shown, it includes an auger drilling device, the power mechanism of the auger drilling device is connected with a sleeve drilling unit, the sleeve drilling unit includes a built-in main drill rod 12 and a drill barrel 13 sleeved outside the main drill rod 12, the outer surface of the main drill rod 12 is provided with a large spiral blade 15, the outer wall of the drill barrel 13 is provided with a small spiral blade 14, the main drill rod 12 and the drill barrel 13 are coaxially arranged, the power mechanism is configured to drive the rotation of the main drill rod 12 and the drill barrel 13, and the lower end of the main drill rod 12 passes through the bottom 13 of the drill barrel to form an extension section. Among them, the large spiral blade is large in size and is used to drill the main part of the pile hole, such as Figure 1As shown, the main part is the hole 17 drilled by the main drill rod 12, and the small spiral blade 14 is only used to expand the hole 17. Since the main drill rod 12 has already drilled the main part of the pile hole 18, the subsequent expansion process has relatively small resistance and can be successfully completed through the drill tube 13. The size of the large and small spiral blades can be set as needed.

[0052] Example 2

[0053] In a further embodiment, Figure 1-9 As shown, the power mechanism drives the main drill rod and the drill tube synchronously or drives the main drill rod and the drill tube intermittently. This embodiment provides two drilling methods, both of which can be applied to drilling and pouring cast-in-place piles in geological conditions containing sand layers.

[0054] like Figure 1-9 As shown, the auger drilling device includes a first auger drilling body 2, the power mechanism includes a first drive motor 7, the top of the first drive motor 7 is fixedly connected to a first moving seat 6, one side of the first moving seat 6 is provided with a linear guide rail 23 arranged longitudinally, the first moving seat 6 is slidably connected to the linear guide rail 23, the top of the linear guide rail 23 is provided with a guide wheel mechanism 4, and the top of the first moving seat 6 is connected to the winch 3 of the first auger drilling body 2 through a wire rope 5 that bypasses the guide wheel mechanism 4.

[0055] The structure of the first auger drill body can refer to commercial products. This embodiment provides an implementation method, that is, the first movable seat is pulled up and down along the linear guide rail 23 by the winch 3, and the first drive motor is used as a power to drive the drilling. Among them, the linear guide rail is fixedly connected to the end of the first auger drill body. According to the common design, a counterweight is provided on the bottom plate of the first auger drill body.

[0056] like Figure 1-7 As shown, the structure of the power mechanism synchronously driving the main drill rod 12 and the drill barrel 13 is as follows: the top of the drill barrel 13 is coaxially provided with a first connecting tube 8, the bottom edge of the first connecting tube 8 is provided with a first outer flange 9, the top edge of the drill barrel 13 is provided with a second outer flange 10, the first outer flange 9 and the second outer flange 10 are fixedly connected by a first bolt and nut assembly, the top of the first connecting tube 8 is fixedly connected to the outer wall of the main drill rod 12 through a plurality of equally spaced stiffening connecting plates 11, and the top of the main drill rod 12 is fixedly connected to the output shaft end of the first driving motor 7. Among them, the mud and sand drilled out of the main drill rod are mainly discharged through the drill barrel, the first connecting tube, and the gap between the adjacent stiffening connecting plates, and the soil drilled out of the drill barrel is discharged from the pile hole port outside the drill barrel. When the first driving motor rotates, it synchronously drives the main drill rod and the drill barrel to rotate, so as to realize the synchronous operation of drilling holes and expanding the diameter.

[0057] Example 3

[0058] In a further embodiment, Figure 8 , 9 As shown, the auger drilling device also includes a second auger drilling body (not marked in the figure, and its structure is the same as that of the first auger drilling body) arranged on the opposite side of the first auger drilling body 2, and the power mechanism also includes a second drive motor 31. The structure of the power mechanism intermittently driving the main drill rod 12 and the drill barrel 13 is as follows: the linear guides 23 of the first auger drilling body 2 and the second auger drilling body are symmetrically arranged on both sides of the pile hole, and the two ends of the first movable seat 6 are respectively slidably connected to the corresponding linear guides 23, and the top of the drill barrel 13 is also provided with a second connecting tube 26, and the bottom end of the second connecting tube 26 is provided with a third outer flange (not marked in the figure).

[0059] The third outer flange is fixedly connected to the second outer flange 10 at the top of the drill tube by a second bolt and nut assembly, and the second movable seats 24 are slidably connected to the two linear guide rails 23 below the first movable seat 6, and a connecting plate (not marked in the figure) is laterally connected between the two second movable seats 24. The connecting plate is provided with a through hole 30 for passing the second connecting tube 26, and a first fixing ring 27 is coaxially fixedly provided on the lower surface of the connecting plate where the outer edge of the lower port of the through hole 30 is located.

[0060] The outer wall of the second connecting cylinder 26 is coaxially fixedly connected with the second fixing ring 28, the first fixing ring 27 and the second fixing ring 28 are connected via a tension bearing 29, a driven gear 33 is coaxially fixedly connected to the outer wall of the second connecting cylinder 26 below the second fixing ring 28, the lower end of the connecting plate is fixedly connected to the second drive motor 31, and the output shaft of the second drive motor 31 is fixedly connected with the driving gear 32.

[0061] The driving gear 32 is meshed with the driven gear 33, and an electric telescopic mechanism 25 (such as an electric cylinder, a hydraulic cylinder, a pneumatic cylinder, or other telescopic equipment) is longitudinally connected between the first movable seat 6 and the second movable seat 24. When the second drive motor is started, the driving gear drives the driven gear to rotate, and then drives the second connecting tube to rotate, and then drives the drill tube to rotate. As the screwing process progresses, the electric telescopic mechanism 25 extends until the required drilling stroke is reached.

[0062] In a further embodiment, Figure 1-9 As shown, the outer end of the small spiral blade 15 is slidably matched with the inner wall of the drill tube 13; the stroke of the electric telescopic mechanism 25 is the same as the length of the extension section.

[0063] Example 4

[0064] In a further embodiment, Figure 3As shown, the drill pipe 13 is also equipped with a hammer head, which includes a column 19, a fourth outer flange 21 arranged at the bottom of the column 19, the fourth outer flange 21 is fixedly connected to the second outer flange 10 by a third bolt and nut assembly, and a fixing block 20 is arranged at the top of the column 19. When the drill bit of the main drill rod reaches the bottom of the pile hole, the main drill rod can be taken out. Since the extension section is limited in length, the resistance of the sand layer is small, and the hole has been drilled by the main drill rod, the drill pipe can be made to reach the depth of the pile hole by hammering.

[0065] Example 5

[0066] Based on the above embodiments, this embodiment discloses a construction method for treating a cast-in-place pile construction device containing a sand layer, such as Figure 1-9 As shown, it includes method 1 in which a power mechanism synchronously drives the main drill rod and the drill barrel, and method 2 in which a power mechanism intermittently drives the main drill rod and the drill barrel.

[0067] like Figure 1-7 As shown, the method 1 comprises the following steps:

[0068] (11) The drill tube 13 is sleeved outside the main drill rod 12, and the top end of the drill tube 13 is fixedly connected to the outer wall of the main drill rod 12 through the first connecting tube 8, and the first driving motor 7 is started to start drilling; during the drilling process, the main drill rod 12 is used to drill the main body of the pile hole 18, and the drill tube 13 is used to expand the diameter of the hole 17 drilled by the main drill rod by screwing into the hole, and finally to form a pile hole 18 of a desired size;

[0069] (12) When the drill bit 16 of the main drill rod 12 drills to the depth of the bottom end of the pile hole 18, the first drive motor 7 is stopped, the first bolt and nut assembly is removed, and the main drill rod 12 together with the first connecting tube is taken out of the drill tube 13;

[0070] (13) Figure 4 As shown, a hammer head is connected to the top of the drill tube 13, and the drill tube is hammered to the depth of the bottom of the pile hole 18 by the hammering device;

[0071] (14) Figure 5 , 6 As shown, the hammer head is removed, and concrete is poured in the drill tube 13 and cured to form;

[0072] (15) Figure 6 As shown, the drill tube 13 is taken out by a lifting device, and concrete slurry is poured into the gap between the bored pile 22 and the pile hole 18 (the bored pile and the pile hole are supported by a pad, and then the gap is filled);

[0073] It should be noted that if more mud and sand fall to the bottom of the pile hole during the hammering process, the main drill rod can be drilled slightly deeper than the bottom of the pile hole to receive the mud and sand generated by the expansion. Generally speaking, the mud and sand generated by the hammering expansion in the extension section is less, and this error can be ignored, or a hammering device can be lowered in the drill tube to compact the mud and sand at the bottom of the drill tube.

[0074] like Figure 8 , 9 As shown, the second method comprises the following steps:

[0075] (21) The first auger drill body 2 and the second auger drill body are arranged on both sides of the preset pile hole position, so that the two ends of the first movable seat 6 are slidably connected with the two linear guide rails 23, and the two second movable seats 24 are fixedly connected by a connecting plate. The main drill rod passes through the through hole 30, and the drill tube 13 is sleeved outside the main drill rod 12, and the drill tube 13 is connected through the second connecting tube 26. The second connecting tube 26 passes through the through hole 30, and the second connecting tube 26 is rotatably connected with the connecting plate through the tension bearing 29. At this time, the driving gear 32 is meshed and connected with the driven gear 33;

[0076] (22) The first drive motor 7 is started first. When the extension section completely enters the soil, the first drive motor 7 is stopped and the second drive motor 31 is started to make the drill tube 13 rotate downward along the inner wall of the hole 17 drilled by the main drill rod and expand the hole diameter. During this process, the electric telescopic mechanism 25 is extended until the stroke reaches the length of the extension section and the second drive motor 31 is stopped; then, the first drive motor 7 is started again to make the main drill rod 12 drill a hole 17 of the length of the extension section, and then the second drive motor 31 is started again to expand the hole diameter. This cycle is repeated and finally the pile hole 18 is formed;

[0077] (23) Release the second bolt and nut assembly, remove the main drill rod 12 and the second connecting tube 26 on its outer side from the construction site (at this time, the first auger drill body 2 and the second auger drill body can be connected to the second movable seat through a wire rope), pour concrete in the drill tube 13, and after curing and forming, take out the drill tube 13, and pour concrete slurry into the gap between the outer wall of the bored pile 22 and the pile hole 18 (support the bored pile and the pile hole with a pad, and then fill the gap).

Claims

1. A cast-in-place pile construction equipment for treating sand-containing layers, characterized by: It comprises an auger drilling device, wherein the power mechanism of the auger drilling device is connected with a sleeve-type drilling unit; The sleeve-type drilling unit comprises a built-in main drill rod and a drill barrel sleeved outside the main drill rod, the outer surface of the main drill rod is provided with a large spiral blade, and the outer wall of the drill barrel is provided with a small spiral blade; The main drill rod and the drill barrel are coaxially arranged, the power mechanism is configured to drive the rotation of the main drill rod and the drill barrel, and the lower end of the main drill rod passes through the bottom of the drill barrel to form an extension section.

2. A cast-in-place pile construction equipment for treating a sand-containing layer as claimed in claim 1, characterized in that: The power mechanism drives the main drill rod and the drill barrel synchronously or drives the main drill rod and the drill barrel intermittently.

3. A cast-in-place pile construction equipment for treating a sand-containing layer as claimed in claim 2, characterized in that: The auger drilling device comprises a first auger drilling body, the power mechanism comprises a first driving motor, and the top end of the first driving motor is fixedly connected to a first moving seat; A linear guide rail arranged longitudinally is provided on one side of the first movable seat, the first movable seat is slidably connected to the linear guide rail, a guide wheel mechanism is provided at the top of the linear guide rail, and the top of the first movable seat is connected to the winch of the first spiral drilling machine body through a wire rope bypassing the guide wheel mechanism.

4. A cast-in-place pile construction equipment for treating a sand-containing layer as claimed in claim 3, characterized in that: The structure of the power mechanism synchronously driving the main drill rod and the drill tube is as follows: a first connecting tube is coaxially arranged at the top of the drill tube, a first outer flange is arranged at the bottom edge of the first connecting tube, and a second outer flange is arranged at the top edge of the drill tube; The first outer flange and the second outer flange are fixedly connected by a first bolt and nut assembly, the top end of the first connecting tube is fixedly connected to the outer wall of the main drill pipe by a plurality of equally spaced stiffening connecting plates, and the top end of the main drill pipe is fixedly connected to the output shaft end of the first drive motor.

5. A cast-in-place pile construction equipment for treating a sand-containing layer as claimed in claim 3, characterized in that: The auger drilling device further comprises a second auger drilling body disposed on the opposite side of the first auger drilling body, and the power mechanism further comprises a second drive motor; The structure of the power mechanism intermittently driving the main drill rod and the drill barrel is as follows: the linear guides of the first auger drill body and the second auger drill body are symmetrically arranged on both sides of the pile hole, the two ends of the first moving seat are respectively slidably connected with the corresponding linear guides, the top of the drill barrel is also provided with a second connecting tube, the bottom end of the second connecting tube is provided with a third outer flange, and the third outer flange is fixedly connected to the second outer flange at the top of the drill barrel through a second bolt and nut assembly; The second moving seats are slidably connected to the two linear guide rails below the first moving seat, and a connecting plate is connected between the two second moving seats in the transverse direction. The connecting plate is provided with a through hole for passing the second connecting tube, and a first fixing ring is coaxially fixed on the lower surface of the connecting plate where the outer edge of the lower port of the through hole is located; The outer wall of the second connecting cylinder is coaxially fixedly connected with a second fixing ring, the first fixing ring and the second fixing ring are connected via a tension bearing, the outer wall of the second connecting cylinder below the second fixing ring is coaxially fixedly connected with a driven gear, and the lower end of the connecting plate is fixedly connected to the second driving motor; The output shaft of the second driving motor is fixedly connected with a driving gear, and the driving gear is meshedly connected with a driven gear. An electric telescopic mechanism is also longitudinally connected between the first moving seat and the second moving seat.

6. A cast-in-place pile construction equipment for treating a sand-containing layer as claimed in claim 4 or 5, characterized in that: The outer end of the small spiral blade is slidably matched with the inner wall of the drill tube; the stroke of the electric telescopic mechanism is the same as the length of the extension section.

7. A cast-in-place pile construction equipment for treating a sand-containing layer as claimed in claim 4, characterized in that: The drill tube is also equipped with a hammer head, which includes a column and a fourth outer flange arranged at the bottom of the column. The fourth outer flange is fixedly connected to the second outer flange through a third bolt and nut assembly, and a fixing block is arranged at the top of the column.

8. A construction method for treating a cast-in-place pile construction equipment containing sand layers as claimed in claim 5 or 7, characterized in that: The invention comprises a method 1 in which a power mechanism synchronously drives a main drill rod and a drill barrel, and a method 2 in which a power mechanism intermittently drives the main drill rod and the drill barrel.

9. A construction method for treating a cast-in-place pile construction device containing sand layers as claimed in claim 8, characterized in that: The method 1 comprises the following steps: (11) The drill tube is sleeved outside the main drill rod, the top end of the drill tube is fixedly connected to the outer wall of the main drill rod through the first connecting tube, and the first driving motor is started to start drilling; during the drilling process, the main drill rod is used to drill the main body of the pile hole, and the drill tube is used to expand the diameter of the hole drilled by the main drill rod by screwing into the outer wall of the hole, and finally to form a pile hole of a desired size; (12) When the drill bit of the main drill rod reaches the depth of the bottom end of the pile hole, the first drive motor is stopped, the first bolt and nut assembly is removed, and the main drill rod together with the first connecting tube is taken out of the drill tube; (13) Connect a hammer head to the top of the drill tube and hammer the drill tube to the depth of the bottom of the pile hole through the hammering equipment; (14) Remove the hammer head, pour concrete in the drill tube and cure it; (15) Remove the drill tube by lifting equipment and pour concrete slurry into the gap between the bored pile and the pile hole; The second method comprises the following steps: (21) A first auger drill body and a second auger drill body are arranged on both sides of the preset pile hole position, so that the two ends of the first movable seat are slidably connected to the two linear guide rails, and the two second movable seats are fixedly connected by a connecting plate. The main drill rod passes through the through hole, and the drill barrel is sleeved outside the main drill rod and connected to the drill barrel through the second connecting barrel. The second connecting barrel passes through the through hole, and the second connecting barrel is rotatably connected to the connecting plate through a tension bearing. At this time, the driving gear is meshed and connected with the driven gear; (22) The first drive motor is started first. When the extension section completely enters the soil, the first drive motor is stopped and the second drive motor is started to rotate the drill tube downward along the inner wall of the hole drilled by the main drill rod and expand the hole diameter. During this process, the electric telescopic mechanism is extended until the stroke reaches the length of the extension section and the second drive motor is stopped; Then, the first driving motor is started again to make the main drill rod drill a hole of the extended length, and then the second driving motor is started again to expand the diameter, and this cycle is repeated to finally form the pile hole; (23) Release the second bolt and nut assembly, remove the main drill rod and the second connecting tube on its outer side from the construction site, pour concrete in the drill tube, and after curing and forming, remove the drill tube and pour concrete slurry into the gap between the outer wall of the bored pile and the pile hole.

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