Rotary drilling structure

Abstract

The utility model relates to the technical field of rotary drilling, which comprises a drilling barrel and a reaming unit which are coaxially connected. The reaming unit comprises a connecting shaft body and at least one group of reaming assemblies, the connecting shaft body is fixed at the top of the drill cylinder, and the reaming assemblies are arranged at intervals in the height direction of the connecting shaft body; the reaming assembly comprises a plurality of reaming pieces, and the reaming pieces are evenly distributed in the circumferential direction of the connecting shaft body. According to the rotary excavating drilling structure, the technical problem that the bearing capacity of a pile body is reduced due to the fact that the hole wall collapses and the hole diameter is reduced easily when rotary excavating drilling is conducted in a soil layer with the low bearing capacity is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of rotary drilling, in particular to a rotary drilling structure. Background Art

[0002] In deep foundation construction for civil engineering projects, rotary drilling technology, with its unique advantages of high efficiency and environmental friendliness, stands out among numerous construction methods, becoming the preferred choice for many large and complex projects. However, in actual construction, especially when working with soils with low bearing capacity, such as mud and soft soil, traditional rotary drilling systems have encountered unprecedented challenges, and their limitations have gradually become apparent.

[0003] This type of soil layer with insufficient bearing capacity is soft, and the hole wall cannot withstand the various pressures generated during and after drilling, such as the soil's own weight and groundwater pressure. As a result, the hole wall is prone to collapse, which in turn causes the hole diameter to shrink, a phenomenon commonly known as "shrinkage." The occurrence of shrinkage not only directly affects the accuracy and stability of the drilling, making it difficult to meet the design requirements for the diameter and depth of the drilled hole, but also causes great difficulties for subsequent pile construction. Due to the reduced hole diameter, the pile body is difficult to smoothly insert into the predetermined position, and may even cause serious consequences such as pile deflection and fracture. This not only seriously affects the quality of the project and leads to a decrease in the bearing capacity of the pile body, but also may cause a series of safety hazards, such as pile instability and foundation settlement. In addition, the shrinkage phenomenon increases the difficulty and cost of construction, prolongs the construction period, and causes unnecessary economic losses to the project.

[0004] Therefore, in view of this, the inventor proposes a rotary drilling structure to solve the above technical problems. Utility Model Content

[0005] The purpose of the utility model is to provide a rotary drilling structure to solve the technical problem that rotary drilling in soil layers with low bearing capacity easily leads to hole wall collapse, hole diameter reduction (shrinkage), and a decrease in pile body bearing capacity.

[0006] In order to achieve the above purpose, the technical solution adopted by the present utility model is as follows:

[0007] A rotary drilling structure comprises a drill barrel and a reaming unit, wherein the drill barrel and the reaming unit are coaxially connected;

[0008] The reaming unit includes a coupling body and at least one set of reaming components, the coupling body is fixed to the top of the drill tube, and the reaming components are spaced apart along the height direction of the coupling body;

[0009] The hole expanding assembly includes a plurality of hole expanding members, and each of the hole expanding members is evenly distributed along the circumference of the coupling body;

[0010] The hole expanding member can expand outward or contract inward along the radial direction of the coupling body.

[0011] Furthermore, the hole expanding member includes a first connecting member, a second connecting member and a third connecting member, and the first connecting member is detachably mounted on the coupling body;

[0012] The second connecting member is located between the first connecting member and the third connecting member, and is used to connect the first connecting member and the third connecting member.

[0013] Furthermore, the first connecting member includes a round rod, a slider, a first connecting block and a second connecting block, and the first connecting block and the second connecting block are respectively fixed at two ends of the round rod.

[0014] Furthermore, the slider is slidably arranged on the round rod, and the slider can slide along the length direction of the round rod;

[0015] A tension spring is sleeved on the round rod, and the tension spring is located between the slider and the second connecting block. The tension spring has a tendency to drive the slider to approach the second connecting block.

[0016] Furthermore, the slider is slidably arranged on the round rod, and the slider can slide along the length direction of the round rod;

[0017] A spring is sleeved on the round rod. The spring is located between the slider and the first connecting block. The spring has a tendency to drive the slider away from the first connecting block.

[0018] Furthermore, the third connecting member includes a mounting bar and an expanding knife, and the expanding knife is detachably mounted on the mounting bar.

[0019] Furthermore, the second connecting member includes a first connecting rod, a second connecting rod and a third connecting rod, one end of the first connecting rod is hinged to the first connecting block, and the other end of the first connecting rod is hinged to one end of the mounting bar;

[0020] One end of the second connecting rod is hinged to the second connecting block, and the other end of the second connecting rod is hinged to the other end of the mounting bar;

[0021] One end of the third connecting rod is hinged to the slider, and the other end of the third connecting rod is hinged to the middle position of the first connecting rod.

[0022] Furthermore, the expanding knife has a wavy structure, and a plurality of serrations are provided on a side of the expanding knife away from the mounting bar.

[0023] Furthermore, a plurality of through holes are formed on the first connecting block and the second connecting block.

[0024] Furthermore, it also includes a drilling rig, which is rotatably connected to a drive shaft, and the drive shaft is coaxially connected to the coupling body.

[0025] Beneficial effects of the utility model:

[0026] This new design utilizes a reaming assembly to effectively grind and reinforce the hole wall during drilling. The wavy, serrated reaming cutter penetrates deep into the soil, significantly improving both soil-breaking and reaming performance. During reaming, the cutter maintains close contact with the inner wall of the hole. The grinding action not only increases the hole diameter but also significantly roughens the hole wall. This roughened hole wall provides greater friction when in contact with the pile body, effectively stabilizing the hole wall and preventing it from shrinking.

[0027] The reaming assembly of this structure is retracted when stationary, facilitating insertion into the hole. When the coupling rotates, the reaming assembly expands outward due to centrifugal force, dynamically grinding and reinforcing the hole wall. This not only simplifies the drilling process but also improves efficiency. Furthermore, since the hole wall is effectively stabilized, safety hazards caused by inward hole shrinkage are avoided, ensuring the safety of the drilling operation. This provides strong support for deep foundation construction in civil engineering projects and promotes the further development of drilling technology.

[0028] Other advantages, objectives and features of the present application will be described to some extent in the subsequent description, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present application. The objectives and other advantages of the present application can be achieved and obtained through the following specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the overall structure of the rotary drilling structure of the utility model;

[0030] Figure 2 The hole expansion member of the rotary drilling structure of the utility model (see Figure 1 ) Structural diagram;

[0031] Figure 3 The hole expansion member of the rotary drilling structure of the utility model (see Figure 2 ) Structural diagram;

[0032] Figure 4 It is a schematic diagram of the overall structure of the drilling rig in the rotary drilling structure of the present invention.

[0033] Among them, the drill barrel 1, the connecting shaft 2, the reaming member 3, the first connecting member 31, the round rod 311, the slider 312, the first connecting block 313, the second connecting block 314, the tension spring 315, the second connecting member 32, the first connecting rod 321, the second connecting rod 322, the third connecting rod 323, the third connecting member 33, the mounting bar 331, the expanding knife 332, the through hole 34, the drive shaft 4, and the drilling rig 5. DETAILED DESCRIPTION

[0034] The following describes the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different perspectives and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are intended solely to illustrate the present invention and are not intended to limit the scope of protection of the present invention.

[0035] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention. Therefore, the drawings only show components related to the present invention and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.

[0036] This embodiment proposes a rotary drilling structure, such as Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, it includes a drill barrel 1 and a reaming unit. The reaming unit is arranged above the drill barrel 1. In this embodiment, the function of the drill barrel 1 is to drill holes. At the same time, the drill barrel 1 can also be replaced with a drill bit. The drill barrel 1 is coaxially connected to the reaming unit; the reaming unit includes a coupling 2 and at least one group of reaming components. The coupling 2 is fixed to the top of the drill barrel 1. The reaming components are spaced apart along the height direction of the coupling 2. In this embodiment, the height of the coupling 2 in this embodiment can be determined and selected according to the specific drilling depth. When the hole to be drilled is deeper, the length of the coupling 2 can be appropriately increased to adapt to the needs of drilling the hole. In this embodiment, the number of reaming components is preferably three. Of course, it can be understood that the number of reaming components is designed according to the length of the coupling 2. The number of reaming components can be four, five or even more, and this embodiment does not impose any restrictions.

[0037] Furthermore, the reaming assembly includes a plurality of reaming members 3, each evenly distributed along the circumference of the coupling 2. The reaming members 3 can expand outward or contract inward radially along the coupling 2. When the coupling 2 rotates, the reaming members 3 are subjected to centrifugal force, causing each reaming member 3 to expand outward, thereby grinding the inner wall of the hole and preventing shrinkage.

[0038] As a preferred embodiment, Figure 2 and Figure 3 As shown, the expansion member 3 includes a first connecting member 31, a second connecting member 32 and a third connecting member 33. The first connecting member 31 is detachably mounted on the outer wall of the coupling body 2; the second connecting member 32 is located between the first connecting member 31 and the third connecting member 33, and the second connecting member 32 is used to connect the first connecting member 31 and the third connecting member 33.

[0039] Specifically, the first connecting member 31 includes a round rod 311, a slider 312, a first connecting block 313 and a second connecting block 314. The first connecting block 313 and the second connecting block 314 are respectively fixed at both ends of the round rod 311; a plurality of through holes 34 are opened on the first connecting block 313 and the second connecting block 314. By setting the through holes 34, bolts can be passed through the through holes 34 to fix the first connecting block 313 and the second connecting block 314 to the outer wall of the coupling body 2, which is convenient for installation.

[0040] As a preferred embodiment, Figure 2 and Figure 3 As shown, the third connecting member 33 includes a mounting bar 331 and an expanding knife 332. The expanding knife 332 is detachably mounted on the mounting bar 331. Specifically, the detachability can be achieved by connecting with bolts; for example, the expanding knife 332 is mounted on the mounting bar 331 using bolts.

[0041] like Figure 2 As shown, the second connecting member 32 includes a first connecting rod 321, a second connecting rod 322 and a third connecting rod 323. One end of the first connecting rod 321 is hinged to the first connecting block 313, and the other end of the first connecting rod 321 is hinged to one end of the mounting bar 331; one end of the second connecting rod 322 is hinged to the second connecting block 314, and the other end of the second connecting rod 322 is hinged to the other end of the mounting bar 331; one end of the third connecting rod 323 is hinged to the slider 312, and the other end of the third connecting rod 323 is hinged to the middle position of the first connecting rod 321.

[0042] As a preferred embodiment, the expanding blade 332 has a wavy structure, with a plurality of serrations on the side of the expanding blade 332 facing away from the mounting bar 331. The wavy structure of the expanding blade 332 can enhance the soil-breaking ability to a certain extent. The wavy and serrated shape can more effectively cut into the soil layer, improving the expansion effect.

[0043] As an exemplary embodiment, Figure 2 As shown, the slider 312 is slidably set on the round rod 311, and the slider 312 can slide along the length direction of the round rod 311; a tension spring 315 is sleeved on the round rod 311, and the tension spring 315 is located between the slider 312 and the second connecting block 314. The tension spring 315 has a tendency to drive the slider 312 close to the second connecting block 314.

[0044] According to the above technical solution, the slider 312 is slidably mounted on the rod 311 and can slide freely along the length of the rod 311. A tension spring 315 is mounted on the rod 311 and positioned between the slider 312 and the second connecting block 314. This tension spring 315 provides tension, keeping the slider 312 positioned close to the second connecting block 314 when stationary. In this state, the entire reaming assembly is in a retracted state, allowing it to be inserted into the hole. When the coupling 2 begins to rotate, the slider 312 and its accompanying reaming assembly are subjected to centrifugal force. This centrifugal force increases with the increase of rotational speed. When the centrifugal force is greater than the tension of the tension spring 315, the expanding knife 332 begins to move outward along the round rod 311. During the expansion process, the expanding knife 332 on the reaming assembly will contact the inner wall of the hole and grind it. The grinding effect can not only expand the hole diameter, but also increase the roughness of the hole wall. After the foundation pile is filled, it can also increase the friction between the hole wall and the pile body, thereby achieving the purpose of stabilizing the hole wall and preventing the hole from shrinking.

[0045] In one possible embodiment, the slider 312 is slidably set on the round rod 311, and the slider 312 can slide along the length direction of the round rod 311; a spring (not shown) is sleeved on the round rod 311, and the spring is located between the slider 312 and the first connecting block 313, and the spring has a tendency to drive the slider 312 away from the first connecting block 313.

[0046] As a preferred embodiment, Figure 4 As shown, the drilling rig 5 is also included. The drilling rig 5 is provided with a drive motor (not shown) and a hydraulic telescopic rod (not shown). The drive motor drives the drive shaft 4 to rotate. The drive shaft 4 is coaxially connected to the coupling 2. The rotation of the drive shaft 4 drives the drill barrel 1 and the reaming unit to work. The hydraulic telescopic rod can drive the drive motor, the drive shaft 4 and the coupling 2 to rise or fall.

[0047] It should be noted that this device is suitable for further drilling into a hole that already has a certain depth. During implementation, in a stationary state, due to the tension of the tension spring 315, the slider 312 remains close to the second connecting block 314, and the entire reaming assembly is in a retracted state, so that the reaming unit can be easily extended into the hole. When the drill barrel 1 and the reaming unit reach the specified depth and need to be drilled further, the drive motor is started, which drives the drive shaft 4 to rotate. The drive shaft 4 is coaxially connected to the coupling 2, so the coupling 2 also rotates accordingly. However, when the coupling body 2 starts to rotate, the slider 312 and the accompanying reaming assembly will be affected by centrifugal force, and the centrifugal force increases with the increase in rotation speed. When the centrifugal force is greater than the tension of the tension spring 315, the slider 312 begins to slide outward along the round rod 311, driving the reaming assembly to expand outward; during the expansion process, the diameter expansion knife 332 on the reaming assembly contacts the inner wall of the hole and grinds it. The diameter expansion knife 332 has a wavy structure and is provided with serrations on the side away from the mounting bar 331. This design can more effectively cut into the soil layer, improve the soil breaking ability and diameter expansion effect, and the grinding effect can not only expand the hole diameter, but also increase the roughness of the hole wall, thereby increasing the friction between the hole wall and the pile body, thereby achieving the purpose of stabilizing the hole wall and preventing the hole from shrinking.

[0048] The above embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Any equivalent substitution or modification made by those skilled in the art based on the present invention shall fall within the protection scope of the present invention.

Claims

1. A rotary drilling structure, characterized in that: include: A drill barrel (1) and a reaming unit, wherein the drill barrel (1) is coaxially connected to the reaming unit; The reaming unit comprises a coupling body (2) and at least one set of reaming components, the coupling body (2) is fixed to the top of the drill tube (1), and the reaming components are arranged at intervals along the height direction of the coupling body (2); The hole expansion assembly comprises a plurality of hole expansion members (3), each of the hole expansion members (3) being evenly distributed along the circumference of the coupling body (2); The hole expanding member (3) can expand outward or contract inward along the radial direction of the coupling body (2).

2. The rotary drilling structure according to claim 1, characterized in that: The hole expanding member (3) comprises a first connecting member (31), a second connecting member (32) and a third connecting member (33), wherein the first connecting member (31) is detachably mounted on the shaft coupling (2); The second connecting member (32) is located between the first connecting member (31) and the third connecting member (33), and the second connecting member (32) is used to connect the first connecting member (31) and the third connecting member (33).

3. The rotary drilling structure according to claim 2, characterized in that: The first connecting member (31) comprises a round rod (311), a slider (312), a first connecting block (313) and a second connecting block (314); the first connecting block (313) and the second connecting block (314) are respectively fixed to two ends of the round rod (311).

4. The rotary drilling structure according to claim 3, characterized in that: The slider (312) is slidably arranged on the round rod (311), and the slider (312) can slide along the length direction of the round rod (311); A tension spring (315) is sleeved on the round rod (311), and the tension spring (315) is located between the slider (312) and the second connecting block (314). The tension spring (315) has a tendency to drive the slider (312) to approach the second connecting block (314).

5. The rotary drilling structure according to claim 3, characterized in that: The slider (312) is slidably arranged on the round rod (311), and the slider (312) can slide along the length direction of the round rod (311); A spring is sleeved on the round rod (311), and the spring is located between the slider (312) and the first connecting block (313). The spring has a tendency to drive the slider (312) away from the first connecting block (313).

6. The rotary drilling structure according to claim 4, characterized in that: The third connecting member (33) comprises a mounting bar (331) and an expanding knife (332), wherein the expanding knife (332) is detachably mounted on the mounting bar (331).

7. The rotary drilling structure according to claim 6, characterized in that: The second connecting member (32) comprises a first connecting rod (321), a second connecting rod (322) and a third connecting rod (323), one end of the first connecting rod (321) is hinged to the first connecting block (313), and the other end of the first connecting rod (321) is hinged to the mounting bar (331); One end of the second connecting rod (322) is hinged to the second connecting block (314), and the other end of the second connecting rod (322) is hinged to the mounting bar (331); One end of the third connecting rod (323) is hinged to the slider (312), and the other end of the third connecting rod (323) is hinged to the middle position of the first connecting rod (321).

8. The rotary drilling structure according to claim 6, characterized in that: The expanding knife (332) has a wave-shaped structure, and a plurality of saw teeth are provided on a side of the expanding knife (332) facing away from the mounting strip (331).

9. The rotary drilling structure according to claim 3, characterized in that: A plurality of through holes (34) are provided on the first connecting block (313) and the second connecting block (314).

10. The rotary drilling structure according to claim 1, characterized in that: It also includes a drilling rig (5), to which a driving shaft (4) is rotatably connected, and the driving shaft (4) is coaxially connected to the coupling body (2).

Images