A variable-diameter pile construction device

Abstract

The present application relates to a variable diameter pile construction device, belonging to the field of variable diameter pile construction, which includes: a drill rod for connecting to a rotary drilling pile driver; a rotary drilling assembly for rotating a variable diameter disc, including: a body for connecting to the drill rod, wherein the body is provided with a storage space; a cutter bar located within the storage space and movably connected to the body; a drive structure for driving the cutter bar to move relative to the body, so that the cutter bar switches between a folded state and an unfolded state, wherein the cutter bar is located within the storage space in the folded state and extends from the storage space in the unfolded state; and a soil receiving assembly, which is provided at the end of the rotary drilling assembly away from the rotating rod and includes an open soil receiving bag. The present application has the effect of reducing sediment in the hole and improving the quality of pile formation.

Description

Technical Field

[0001] The present application relates to the field of variable diameter pile construction, and in particular to a variable diameter pile construction device. Background Art

[0002] Variable diameter piles, also known as squeezed and expanded branch plate piles, are a new type of pile that has rapidly developed in my country in recent years. Their principle is to add bearing plates and branches at different depths of the pile body, thereby greatly increasing the ratio of pile end resistance and the bearing capacity of the entire pile. The area of the expanded plate of a variable diameter pile with two plates can generally be more than 10 times the cross-sectional area of the main pile. The presence of the branch plate in the pile body makes the load transfer of the variable diameter pile more complex. When the load is transferred to the branch plate position, it will be distributed, partly to the branch plate and partly transmitted downward along the pile body. This effectively reduces the pile diameter and length while significantly improving the pile bearing capacity and reducing pile settlement.

[0003] The traditional construction of branch plate variable diameter piles is to use an extrusion and expansion branch plate machine to extrude and expand the variable diameter after drilling. When squeezing the soil of the hole wall, it is easy to cause the collapse of the upper and lower parts of the soil at the variable diameter. The sediment in the hole is difficult to clean up, which affects the quality of the pile. Summary of the Invention

[0004] In order to reduce sediment in the hole and improve the quality of pile formation, the present application provides a variable diameter pile construction device.

[0005] The present application provides a variable diameter pile construction device that adopts the following technical solution:

[0006] A variable diameter pile construction device, comprising:

[0007] Drill rod, used to connect with the rotary pile driver;

[0008] Rotary drilling assembly, used for rotary drilling reducer, including:

[0009] A fuselage, used for connecting to the drill rod, wherein a receiving space is provided in the fuselage;

[0010] A knife bar is located in the accommodating space and is movably connected to the body;

[0011] a driving structure for driving the knife bar to move relative to the body so as to switch the knife bar between a folded state and an unfolded state, wherein the knife bar is located within the accommodating space in the folded state and extends from the accommodating space in the unfolded state;

[0012] The soil receiving assembly is arranged at one end of the rotary drilling assembly away from the rotating rod, and comprises an open soil receiving bag.

[0013] By adopting the above technical solution, when constructing the variable diameter part of the pile hole, the rotary drilling assembly is first pushed to the construction position through the drill rod. During the process of pushing the rotary drilling assembly, the cutter rod is in a folded state in the accommodating space to prevent the cutter rod from damaging the wall of the pile hole. When the rotary drilling assembly reaches the predetermined position, the drill drives the rotary drilling assembly to rotate. During the rotation of the rotary drilling assembly, the driving structure drives the cutter rod to move, so that the rotary drilling assembly is converted from a folded state to an unfolded state. The cutter rod extends from the accommodating space and rotary drills the inner wall of the pile hole to form a variable diameter part. At the same time, the excavated soil and rocks will fall into the soil bag and will not fall to the bottom of the pile hole, which can reduce the sediment in the hole and improve the quality of the pile.

[0014] Optionally, two groups of the cutter rods are symmetrically arranged in the accommodating space, and the two cutter rods are hinged to the fuselage at one end close to the drill rod. The driving structure includes a first hydraulic rod and two first push rods hinged to the cutter rod respectively, and the two first push rods are hinged at one end away from the cutter rod. When the telescopic end of the first hydraulic rod is extended, it acts on the hinge of the two first push rods to change the angle between the two first push rods.

[0015] By adopting the above technical solution, the two sets of cutter bars are symmetrically arranged, the forces are relatively balanced during the rotary drilling process, and the hole quality is high. When the first hydraulic rod is extended, it can drive the two cutter bars to move at the same time, so that the movements of the two cutter bars can be kept synchronized and the stability is better. At the same time, the hydraulic rod itself can withstand a large load and can stably support the cutter bar during the rotary drilling process, so that the cutter bar will not retract into the accommodation space due to excessive resistance during the rotary drilling process.

[0016] Optionally, the fuselage includes a fixed part and a movable part, the movable part is slidably connected in the accommodating space, the sliding direction of the movable part is perpendicular to the drill rod, the two tool rods are hinged to the movable part one by one, and the driving structure also includes a second hydraulic rod and two second push rods hinged to the movable part respectively, the two second push rods are hinged at one end away from the movable part, and the telescopic end of the second hydraulic rod acts on the hinge of the two second push rods when extended, so that the angle between the two second push rods changes.

[0017] By adopting the above technical solution, when the second hydraulic rod is extended or retracted, it can drive the two second push rods to move, thereby changing the distance between the two movable parts, and finally achieving the purpose of changing the distance between the two cutter rods. After the first push rod pushes the cutter rod out of the accommodating space to complete the rotary drilling, the second hydraulic rod can be used again to drive the two cutter rods to continue moving outward to expand the volume of the rotary drilling.

[0018] Optionally, a guide bar is provided on the movable portion, the guide bar is perpendicular to the drill rod, and a guide groove that slides with the guide bar is provided in the accommodating space.

[0019] By adopting the above technical solution, the guide bar and the guide groove cooperate with each other, so that the movable part can remain stable during the movement process. At the same time, the force-bearing area can be increased, the load per unit area can be reduced, and damage to the movable part when the load is large during rotary drilling can be avoided, thereby improving the service life.

[0020] Optionally, the top end surface of the movable portion is inclined downward from a direction close to the fuselage axis to a direction away from the fuselage axis.

[0021] By adopting the above technical solution, when the two movable parts move away from each other, the movable part will extend out of the fuselage to contact and squeeze the inner wall of the pile hole. The top of the movable part is set to an inclined surface, which can make the weaker part at the intersection of the straight hole part and the variable diameter part of the pile hole be squeezed tightly to form a chamfer, thereby reducing the risk of soil collapse on the inner wall of the pile hole.

[0022] Optionally, a connecting seat is provided between the first push rod and the first hydraulic rod, and a first hinge shaft is commonly provided on the two first push rods. The first hinge shaft is provided on the connecting seat, and a guide sleeve is fixed on the connecting seat. The two first push rods are symmetrically distributed along the axis of the guide sleeve, and the telescopic end of the first hydraulic rod is movably inserted in the guide sleeve.

[0023] By adopting the above technical solution, the connecting seat can connect the two first push rods, providing a stable support point for the first hydraulic rod. At the same time, the guide sleeve can guide the telescopic end of the first hydraulic rod, so that the first push rod is not easy to slide sideways during the process of pushing the connecting seat, and is more stable during operation.

[0024] Optionally, a protective sleeve is provided in the accommodating space, and a clearance groove is provided on the protective sleeve for the first push rod and the second push rod to pass through. A conical sleeve is provided in the protective sleeve and is located above the first hydraulic rod. The conical sleeve is fixedly connected to the protective sleeve, and a gap is formed between the conical sleeve and the protective sleeve.

[0025] By adopting the above technical solution, during the rotary drilling process, some soil may enter the accommodation space. The protective sleeve can protect the first hydraulic rod and the second hydraulic rod, so that the soil can slide downward along the surface of the conical sleeve and then leave the accommodation space through the gap between the conical sleeve and the protective sleeve.

[0026] Optionally, the soil receiving assembly further includes a support frame for supporting the open end of the soil receiving bag, the support frame including a support ring and a connecting rod, the support ring is fixedly connected to the soil receiving bag, the connecting rod is fixedly connected to the fuselage, and a plurality of connecting rods are arranged between the connecting rod and the support ring.

[0027] By adopting the above technical solution, multiple connecting rods can stably support the earthbag, so that the opening of the earthbag remains open to better receive the excavated earth.

[0028] Optionally, the connecting rod includes a first telescopic rod connected to the support rod and a second telescopic rod connected to the support ring, the first telescopic rod is inserted into the second telescopic rod, and a spring is provided in the second telescopic rod to abut against the first telescopic rod.

[0029] By adopting the above technical solution, in order to ensure that all the excavated earth can be received, the open part of the soil bag must be close to the inner wall of the pile hole. However, before the rotary drilling reducing part, when the drill rod drives the soil bag to move downward, if the drill rod vibrates and deviates from the axis of the pile hole, the support ring will scrape the soil off the inner wall of the pile hole. By setting the connecting rod as a retractable rod, even if the drill rod deviates during the process of the soil bag moving up and down in the pile hole, it will not cause damage to the inner wall of the pile hole, thereby further ensuring the quality of the pile.

[0030] In summary, this application includes at least one of the following beneficial technical effects:

[0031] 1. By providing a foldable and unfoldable cutter bar and a driving structure for driving the cutter bar, the variable diameter part of the pile hole can be rotary drilled without damaging the straight part of the pile hole;

[0032] 2. By setting up the soil receiving assembly, the excavated soil and rocks will fall into the soil receiving bag and will not fall to the bottom of the pile hole, which can reduce the sediment in the hole and improve the quality of the pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the three-dimensional structure of an embodiment of the present application;

[0034] Figure 2 yes Figure 1 Schematic diagram of the cross-section structure;

[0035] Figure 3 Schematic diagram of the cross-sectional structure of the knife bar in the embodiment of the present application in the expanded state;

[0036] Figure 4 yes Figure 3 Schematic diagram of the structure behind the hidden fuselage;

[0037] Figure 5 is a schematic structural diagram of a drive assembly according to an embodiment of the present application;

[0038] Figure 6 yes Figure 1 Schematic diagram of the cross-sectional structure of the middle soil connection component.

[0039] Explanation of the accompanying reference numerals: 1. Drill rod; 2. Rotary drilling assembly; 21. Body; 211. Fixed part; 212. Movable part; 22. Cutter rod; 3. Soil receiving assembly; 31. Soil receiving bag; 32. Support ring; 33. Support rod; 34. Support seat; 35. Connecting rod; 351. First telescopic rod; 352. Second telescopic rod; 253. Spring; 4. First driving member; 41. First push rod; 42. First hydraulic rod; 5. Second driving member; 51. Second hydraulic rod; 52. Second push rod; 6. Guide bar; 7. Connecting seat; 8. Guide sleeve; 9. Protective sleeve; 10. Conical sleeve. DETAILED DESCRIPTION

[0040] The following is combined with Figure 1-6 This application is described in further detail.

[0041] The embodiment of the present application discloses a variable diameter pile construction device.

[0042] Reference Figure 1 A variable diameter pile construction device is used for constructing the variable diameter part of the pile hole, comprising a drill rod 1, a rotary drilling assembly 2 and a soil receiving assembly 3. The drill rod 1 is used to connect with the rotary drilling pile driver and can be lifted and rotated under the drive of the rotary drilling pile driver. The rotating assembly is equipped with a foldable and unfoldable cutter rod 22. During the up and down movement of the rotary drilling assembly 2, the cutter rod 22 is in a folded state. When the variable diameter part is being drilled, the cutter rod 22 is in an unfolded state. The soil receiving assembly 3 can receive the earth dug by rotary drilling to prevent the earth from falling to the bottom of the pile hole. After the rotary drilling is completed, when the rotary drilling assembly 2 exits the pile hole, the soil receiving assembly 3 can bring out the excavated earth together, thereby reducing sediment in the hole.

[0043] Reference Figure 2 and Figure 3 The rotary drilling assembly 2 includes: a body 21, a cutter rod 22 and a driving structure. The body 21 is cylindrical as a whole. A accommodating space is provided in the body 21. The cutter rod 22 is located in the accommodating space. The driving structure can drive the cutter rod 22 to extend from the accommodating space.

[0044] The body 21 includes a fixed part 211 and two movable parts 212. The movable parts 212 are slidably connected in the accommodating space. The sliding direction of the movable parts 212 is perpendicular to the drill rod 1. Each movable part 212 is hinged with a knife rod 22. The movement of the two movable parts 212 can drive the knife rod 22 to move horizontally. The angle of the knife rod 22 can be adjusted by rotating between the knife rod 22 and the movable part 212.

[0045] The driving structure includes a first driving member 4 for driving the knife rod 22 to rotate relative to the movable portion 212 and a second driving member 5 for driving the movable portion 212 to slide relative to the fixed portion 211 .

[0046] Reference Figure 4 and Figure 5 The first driving member 4 includes a first hydraulic rod 42 and two first push rods 41. The first hydraulic rod 42 is arranged along the axis of the fuselage 21. The two first push rods 41 are hinged to the knife rod 22 one by one. The two first push rods 41 are hinged at one end away from the knife rod 22. When the telescopic end of the first hydraulic rod 42 is extended, it acts on the hinge of the two first push rods 41, so that the angle between the two first push rods 41 changes, thereby changing the angle of the knife rod 22.

[0047] The second drive member 5 includes a second hydraulic rod 51 and two second push rods 52. The second hydraulic rod 51 is arranged along the axis of the fuselage 21. The telescopic portions of the first hydraulic rod 42 and the second hydraulic rod 51 face opposite directions to prevent interference. Specifically, in this embodiment, the telescopic portion of the first hydraulic rod 42 faces upward, while the telescopic portion of the second hydraulic rod 51 faces downward. The two second push rods 52 are hingedly connected to the movable portion 212 in a one-to-one correspondence. The ends of the two second push rods 52, away from the movable portion 212, are hingedly connected to each other. When the telescopic end of the second hydraulic rod 51 is extended, it acts on the hinge joint of the two second push rods 52, causing the angle between the two second push rods 52 to change.

[0048] In order to ensure that the movable part 212 can remain stable during movement, each movable part 212 is provided with four horizontally arranged guide bars 6. The guide bars 6 are distributed at the four corners of the movable part 212, and a guide groove that slides with the guide bar 6 is provided in the accommodating space. During the sliding process of the movable part 212, the guide bar 6 slides in the guide groove.

[0049] In order to enable the first hydraulic rod 42 to better push the first push rod 41, a connecting seat 7 is provided between the first push rod 41 and the first hydraulic rod 42. A first hinge shaft is commonly passed through the two first push rods 41. The first hinge shaft is set on the connecting seat 7. A guide sleeve 8 is fixed on the connecting seat 7. The two first push rods 41 are symmetrically distributed along the axis of the guide sleeve 8. The telescopic end of the first hydraulic rod 42 is movably inserted in the guide sleeve 8. During operation, if the telescopic movement of the first hydraulic rod 42 and the second hydraulic rod 51 are not synchronized, the telescopic end of the first hydraulic rod 42 can slide in the guide sleeve 8 to avoid damage to the first push rod 41 and the second push rod 52.

[0050] In order to prevent soil and gravel from damaging the driving structure, a protective sleeve 9 is provided in the accommodating space. The anti-slip sleeve is cylindrical, and an air-avoiding groove for the first push rod 41 and the second push rod 52 to pass through is opened on the side wall of the protective sleeve 9. Dust-proof brush bristles are provided in the air-avoiding groove. A conical sleeve 10 is provided in the protective sleeve 9 and is located above the first hydraulic rod 42. The conical sleeve 10 is fixedly connected to the protective sleeve 9, and a gap is formed between the conical sleeve 10 and the protective sleeve 9, so that the soil entering the accommodating space can fall out of the gap.

[0051] The top end surface of the movable portion 212 is inclined downward from the direction close to the axis of the fuselage 21 to the direction away from the axis of the fuselage 21. When the two movable portions 212 move away from each other, the movable portion 212 will extend out of the fuselage 21 to contact and press the inner wall of the pile hole. Setting the top of the movable portion 212 as an inclined surface can squeeze and tighten the relatively weak portion at the intersection of the straight hole part and the diameter-changing part of the pile hole, forming a chamfer.

[0052] Reference Figure 2 and Figure 6 The soil receiving assembly 3 is arranged at one end of the rotary drilling assembly 2 away from the rotating rod, and includes an open soil receiving bag 31 and a support frame for supporting the open end of the soil receiving bag 31.

[0053] The support frame includes a support ring 32, a support rod 33, and a support base 34. The support ring 32 is fixedly connected to the soil bag 31. One end of a connecting rod 35 is fixedly connected to the fuselage 21 and the other end is rotatably engaged with the support base 34. Several connecting rods 35 are provided between the support base 34 and the support ring 32. The connecting rods 35 include a first telescopic rod 351 connected to the support rod 33 and a second telescopic rod 352 connected to the support ring 32. The first telescopic rod 351 is inserted into the second telescopic rod 352. The second telescopic rod 352 is provided with a spring 253 that abuts the first telescopic rod 351.

[0054] The implementation principle of the variable diameter pile construction device of the present application is as follows: when constructing the variable diameter portion of the pile hole, the rotary drilling assembly 2 is first pushed downward to the construction position through the drill rod 1. During the process of pushing the rotary drilling assembly 2, the cutter rod 22 is in a folded state within the accommodation space to prevent the cutter rod 22 from damaging the pile hole wall;

[0055] When the rotary drilling assembly 2 reaches the predetermined position, the drill drives the rotary drilling assembly 2 to rotate. During the rotation of the rotary drilling assembly 2, the driving structure drives the cutter bar 22 to move. First, the first driving member 4 drives the cutter bar 22 to rotate relative to the movable portion 212, so that the cutter bar 22 gradually extends out of the accommodation space and performs preliminary rotary drilling on the inner wall of the pile hole.

[0056] When the cutter bar 22 rotates to its maximum stroke, the second driving member 5 drives the two movable parts 212 away from each other, causing the two cutter bars 22 to move horizontally outward, further expanding the rotary drilling volume. During this process, the first hydraulic rod 42 and the second hydraulic rod 51 need to be synchronously extended and retracted to prevent the angle between the cutter bar 22 and the movable part 212 from changing, thereby maintaining stable rotary drilling.

[0057] After the pile hole diameter reduction portion is drilled, the drive assembly drives the cutter bar 22 to retract into the body 21, and the drill rod 1 drives the rotary drilling assembly 2 to move upward and out of the pile hole;

[0058] The soil and rocks dug out during the rotary drilling process will fall into the soil receiving bag 31. When the rotary drilling assembly 2 leaves the pile hole, the dug soil can be taken out together.

[0059] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A variable diameter pile construction device, characterized by: include: A drill rod (1) for connecting to a rotary pile driver; The rotary drilling assembly (2) is used for rotary drilling of a variable diameter disc, and comprises: A body (21) is used to be connected to the drill rod (1), and a receiving space is provided in the body (21); a knife bar (22), located in the accommodation space and movably connected to the body (21); a driving structure for driving the knife rod (22) to move relative to the body (21) so as to switch the knife rod (22) between a folded state and an unfolded state, wherein in the folded state, the knife rod (22) is located in the accommodating space, and in the unfolded state, the knife rod (22) extends out of the accommodating space; A soil receiving assembly (3) is arranged at one end of the rotary drilling assembly (2) away from the drill rod (1), and comprises an open soil receiving bag (31); Two groups of the cutter bars (22) are symmetrically arranged in the accommodating space, and one end of the two groups of cutter bars (22) close to the drill rod (1) is hinged to the machine body (21). The driving structure includes a first hydraulic rod (42) and two first push rods (41) respectively hinged to the cutter bars (22). The two first push rods (41) are hinged at one end away from the cutter bars (22). When the telescopic end of the first hydraulic rod (42) is extended, it acts on the hinge of the two first push rods (41), so that the angle between the two first push rods (41) changes. The body (21) includes a fixed part (211) and a movable part (212), the movable part (212) is slidably connected in the accommodating space, the sliding direction of the movable part (212) is perpendicular to the drill rod (1), the two groups of the cutter rods (22) are hinged to the movable part (212) in a one-to-one correspondence, and the driving structure also includes a second hydraulic rod (51) and two second push rods (52) respectively hinged to the movable part (212), the two second push rods (52) are hinged at one end away from the movable part (212), and the telescopic end of the second hydraulic rod (51) acts on the hinge of the two second push rods (52) when it is extended, so that the angle between the two second push rods (52) changes.

2. The variable diameter pile construction device according to claim 1, characterized in that: A guide bar (6) is provided on the movable portion (212), the guide bar (6) is perpendicular to the drill rod (1), and a guide groove that is slidably matched with the guide bar (6) is provided in the accommodating space.

3. The variable diameter pile construction device according to claim 1, characterized in that: The top end surface of the movable portion (212) is inclined downward from a direction close to the axis of the fuselage (21) to a direction away from the axis of the fuselage (21).

4. The variable diameter pile construction device according to claim 1, characterized in that: A connecting seat (7) is provided between the first push rod (41) and the first hydraulic rod (42), a first hinge shaft is commonly provided on the two first push rods (41), the first hinge shaft is provided on the connecting seat (7), a guide sleeve (8) is fixed on the connecting seat (7), the two first push rods (41) are symmetrically distributed along the axis of the guide sleeve (8), and the telescopic end of the first hydraulic rod (42) is movably inserted into the guide sleeve (8).

5. The variable diameter pile construction device according to claim 1, characterized in that: A protective sleeve (9) is provided in the accommodating space, and a clearance groove is provided on the protective sleeve (9) for the first push rod (41) and the second push rod (52) to pass through. A conical sleeve (10) is provided in the protective sleeve (9) and is located above the first hydraulic rod (42). The conical sleeve (10) is fixedly connected to the protective sleeve (9), and a gap is formed between the conical sleeve (10) and the protective sleeve (9).

6. The variable diameter pile construction device according to claim 1, characterized in that: The soil receiving assembly (3) further comprises a support frame for supporting the open end of the soil receiving bag (31), the support frame comprising a support ring (32), a support rod (33) and a support seat (34); the support ring (32) is fixedly connected to the soil receiving bag (31); one end of a connecting rod (35) is fixedly connected to the machine body (21) and the other end is rotatably matched with the support seat (34); a plurality of connecting rods (35) are provided between the support seat (34) and the support ring (32); one end of the support rod (33) is connected to the support seat (34) and the other end is connected to the rotary drilling assembly (2).

7. The variable diameter pile construction device according to claim 6, characterized in that: The connecting rod (35) comprises a first telescopic rod (351) connected to the support seat (34) and a second telescopic rod (352) connected to the support ring (32); the first telescopic rod (351) is inserted into the second telescopic rod (352); and a spring (253) is provided in the second telescopic rod (352) and abuts against the first telescopic rod (351).

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