Hole guiding drill rod

Abstract

The utility model relates to the field of constructional engineering, in particular to a guide hole drill rod which comprises a rod body and blades surrounding the rod body and connected to the outer wall of the rod body. The rod body is constructed into a hollow cylindrical shape, and the blades comprise spiral blades constructed into a continuous spiral shape. The hole guiding drill rod is provided with a first end close to the drill bit and a second end opposite to the first end, and the radius of the first end of the hole guiding drill rod is larger than that of the second end. An existing long-strip-protrusion-shaped blade is adjusted to be in a continuous spiral shape, part of redundant soil is transferred out of a drill hole in a spiral lifting mode while stirring is conducted, the resistance of continuous sinking of the hole guiding drill rod is reduced, and forming of a deeper drill hole is facilitated. The guide hole drill rod is constructed into a structure with a larger diameter at one end close to the drill bit, so that a gap exists between the top of the drill hole and the guide hole drill rod, the interference between the solidified inner wall of the drill hole and the guide hole drill rod is reduced, and the guide hole soil body is favorably led out.

Description

Technical Field

[0001] This utility model relates to the field of construction engineering, and in particular to a pre-hole drill rod. Background Technology

[0002] When constructing foundations, especially in areas with complex geological conditions such as soft soil or rock layers, directly driving precast piles can be very difficult. In such cases, it is necessary to use pilot holes to understand the underground conditions beforehand and reduce the resistance during the driving of precast piles, thus facilitating their installation.

[0003] Currently, in the construction of diaphragm walls, triaxial mixing piles are commonly used for precast pile drilling to treat soft soil foundations. The piling machine has three auger drill rods with drill bits. The outer wall of each auger drill rod has multiple separate, elongated, protruding blades. During construction, the three auger drills simultaneously drill downwards, injecting cement from the drill bits into the soil. The rotating blades thoroughly mix the cement and soil, ensuring complete homogenization and increasing the foundation strength through the hardening of soft soil.

[0004] Currently, the drill rods commonly used in triaxial mixing pile machines are typically less than 20 meters in length. When the drill rod is too long, there is too much soil in the borehole, which makes it difficult for the drill rod to continue to move into deeper layers. This makes it difficult for the existing drill rods to assist the main building piles with deeper bearing layers to be directly pressed to the design elevation. Utility Model Content

[0005] The purpose of this utility model is to provide a pre-hole drill rod that facilitates soil introduction.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A pilot hole drill rod includes a rod body and cutter blades connected to the rod body. The rod body is configured as a hollow cylinder, and the cutter blades include helical cutter blades configured as a continuous spiral. The pilot hole drill rod has a first end near a drill bit and a second end opposite to the first end. The radius of the first end of the pilot hole drill rod is greater than the radius of the second end.

[0008] Optionally, the length of the rod is any value between 30m and 40m, and the thickness of the blade is any value between 15mm and 25mm.

[0009] Optionally, the pilot hole drill rod includes multiple assemblies, each assembly including a hollow cylindrical rod section and a cutter blade connected to the outer wall of the rod section. Each rod section has a connecting male end and a connecting female end opposite to the connecting male end. The connecting male ends of the multiple rod sections are detachably connected to the connecting female ends of adjacent rod sections to form the rod body.

[0010] Optionally, the female connecting end of the rod section is sleeved on the outside of the male connecting end of the rod section. The female connecting end of the rod section is provided with a first through hole, and the male connecting end of the rod section is provided with a second through hole that cooperates with the first through hole. The connector passes through a set of oppositely arranged first through holes and a set of oppositely arranged second through holes, and the connector is detachably connected to the male connecting end and the female connecting end of adjacent rod sections.

[0011] Optionally, the connector includes a first pin and a second pin that cooperate with each other. The first pin and the second pin each have a limiting part and a through part that are connected to each other. The limiting part abuts against the outer wall of the connecting female end of the rod section. One end of the through part is connected to the limiting part and passes through the first through hole and the second through hole in sequence. The ends of the through parts of the first pin and the second pin that are away from the limiting part are detachably connected.

[0012] Optionally, the end of the first pin that passes through the limiting portion away from the limiting portion is configured as a hollow column with threads formed on its inner wall, and the end of the second pin that passes through the limiting portion away from the limiting portion is configured as a screw.

[0013] Optionally, the pilot hole drill rod further includes a washer disposed between the outer wall of the connecting female end of the rod section and the limiting portion of the first pin and / or the second pin.

[0014] Optionally, the pilot drill rod further includes a protective sleeve, which is fitted onto the joint between adjacent rod sections.

[0015] Optionally, the blade may further include a stirring blade, which is configured as a strip, with one end connected to the outer wall of the rod and extending in a direction away from the rod.

[0016] Optionally, the first end of the pilot hole drill rod is provided with a plurality of the stirring blades.

[0017] The beneficial effects of this invention are as follows: By adjusting the long, protruding blades into a continuous spiral shape, some excess soil is transferred to the outside of the borehole through spiral lifting while mixing, reducing the resistance to the continued sinking of the pilot drill rod, thus facilitating the formation of a deeper borehole. Constructing the pilot drill rod with a larger diameter at the end near the drill bit creates a gap between the top of the borehole and the pilot drill rod, reducing interference between the solidified borehole inner wall and the pilot drill rod, and facilitating the extraction of borehole soil. It also prevents a large amount of cement extracted from the drill bit from being extracted outside the borehole after mixing with the soil, which is detrimental to the hardening of soft soil.

[0018] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the pre-hole drill rod shown in Embodiment 1 of this utility model;

[0020] Figure 2 This is a schematic diagram of the connection method between adjacent rod sections as shown in Embodiment 1 of this utility model;

[0021] Figure 3 This is a schematic diagram of the connector shown in Embodiment 1 of this utility model.

[0022] Legend: 101-First end, 102-Second end, 1-Assembly, 11-Rod section, 111-Connecting female end, 112-First through hole, 113-Connecting male end, 114-Second through hole, 121-Helical blade, 122-Stirring blade, 2-Connector, 21-First pin, 211-Limiting part, 212-Passing part, 22-Second pin, 3-Gasket, 4-Protective sleeve. Detailed Implementation

[0023] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0025] Please see Figure 1 The pilot-hole drill rod protected by this utility model application includes a rod body and cutter blades surrounding the rod body and connected to the outer wall of the rod body. The rod body is constructed as a hollow cylinder, and the cutter blades include helical cutter blades 121 constructed as a continuous spiral. The pilot-hole drill rod has a first end 101 near the drill bit and a second end 102 opposite to the first end 101, and the radius of the first end 101 is larger than the radius of the second end 102.

[0026] The existing long, protruding blades are adjusted to a continuous spiral shape. While mixing, some excess soil is transferred to the outside of the borehole via a spiral lifting mechanism, reducing the resistance to further descent of the pilot drill rod and thus facilitating the formation of deeper boreholes. The pilot drill rod is constructed with a larger diameter end near the drill bit, creating a gap between the top of the borehole and the pilot drill rod. This reduces interference between the solidified borehole wall and the pilot drill rod, facilitates the removal of borehole soil, and prevents excessive cement from being drawn out of the borehole after mixing with the soil, which would be detrimental to the hardening of soft soil.

[0027] In some embodiments, the length of the rod is any value between 30m and 40m, for example, any value between 30m, 32m, 34m, 36m, 38m and 40m, and the thickness of the blade is any value between 15mm and 25mm, for example, any value between 15mm, 17mm, 19mm, 21mm, 23mm and 25mm. When the drilling depth is large, the length of the rod needs to be matched with the drilling depth, and the blade needs to maintain the stirring capacity and enhance the load-bearing capacity by controlling the thickness.

[0028] In some embodiments, the pilot hole drill rod includes multiple assemblies 1. Each assembly 1 includes a hollow cylindrical rod section 11 and a cutter blade connected to the outer wall of the rod section 11. The rod section 11 has a connecting male end 113 and a connecting female end 111 opposite to the connecting male end 113. The connecting male ends 113 of the multiple rod sections 11 are detachably connected to the connecting female ends 111 of adjacent rod sections 11 to form a rod body. By connecting multiple assemblies end to end in a detachable manner to form a pilot hole drill rod, the length and radius of each part of the pilot hole drill rod can be adjusted, which helps to improve the versatility of the pilot hole drill rod.

[0029] In some embodiments, the female connecting end 111 of the rod section 11 is sleeved on the outside of the male connecting end 113 of the rod section 11. The female connecting end 111 of the rod section 11 is provided with a first through hole 112, and the male connecting end 113 of the rod section 11 is provided with a second through hole 114 that matches the first through hole 112. The connector 2 passes through a set of oppositely arranged first through holes 112 and a set of oppositely arranged second through holes 114, and the connector 2 is detachably connected to the male connecting end 113 and the female connecting end 111 of adjacent rod sections 11. Adjacent rod sections 11 are connected by the connector 2 passing through the through holes, and the torsional stiffness of the connector 2 suppresses the loosening of the connection caused by the overall rotation of the pilot drill rod.

[0030] In some embodiments, the connector 2 includes a first pin 21 and a second pin 22 that cooperate with each other. Both the first pin 21 and the second pin 22 have a limiting portion 211 and a through portion 212 that are connected to each other. The limiting portion 211 abuts against the outer wall of the connecting female end 111 of the rod section 11. One end of the through portion 212 is connected to the limiting portion 211 and passes through the first through hole 112 and the second through hole 114 in sequence. The ends of the through portions 212 of the first pin 21 and the second pin 22 away from the limiting portion 211 are detachably connected. Hiding the connection point of the first pin 21 and the second pin 22 inside the rod section 11 helps protect the connection point and prevents a large amount of cement from adhering to the connection point, making disassembly difficult.

[0031] In some embodiments, the end of the first pin 21 with its through portion 212 away from the limiting portion 211 is configured as a hollow column with threads formed on its inner wall, and the end of the second pin 22 with its through portion 212 away from the limiting portion 211 is configured as a screw. Connection is achieved through rotation in a direction different from that of the pilot hole drill rod, preventing loosening and providing high reliability.

[0032] In some embodiments, the pilot drill rod further includes a washer 3, which is disposed between the outer wall of the connecting female end 111 of the rod section 11 and the limiting portion 211 of the first pin 21 and / or the second pin 22. The washer 3 protects the first through hole 112, preventing cement, i.e., soil, from entering the rod body and preventing cement from entering the threaded area through gaps, thereby reducing the difficulty of disassembly.

[0033] In some embodiments, the pilot drill rod further includes a protective sleeve 4, which is fitted onto the joint between adjacent rod sections 11. The protective sleeve 4 protects the joint, preventing cement from seeping in and helping to reduce the difficulty of disassembly.

[0034] In some embodiments, the blades further include a mixing blade 122, which is constructed in the shape of a strip, with one end connected to the outer wall of the rod and extending in a direction away from the rod. The long and separate mixing blades 122 have a high mixing capacity, which helps to uniformly mix the soil and cement and helps to reinforce the borehole.

[0035] In some embodiments, the first end 101 of the pilot drill rod is provided with a plurality of mixing blades 122, which helps the mixed soil and cement adhere to the inner wall of the borehole, thus aiding in the reinforcement of the borehole.

[0036] Please refer to the following examples for details.

[0037] Example 1:

[0038] Please see Figure 1 The preferred embodiment of this application shows a pilot-hole drill rod comprising multiple assemblies 1, each assembly 1 including a rod section 11 and a cutter blade surrounding and connected to the outer wall of the rod section 11. Each rod section 11 is constructed with the same hollow cylindrical structure, with a connecting sub-end 113 and a connecting female end 111 at each end. The connecting sub-end 113 of any rod section 11 can be detachably connected to the connecting female end 111 of an adjacent rod section 11 to form a rod body, thereby assembling a pilot-hole drill rod with controllable length. The distance between the center of any axial position of the pilot-hole drill rod or assembly 1 and its farthest end is taken as the radius of the corresponding position. The end of the pilot-hole drill rod closer to the drill bit is designated as the first end 101, and the end farther from the drill bit is designated as the second end 102. The radius of the first end 101 of the pilot-hole drill rod is larger than the radius of the second end 102. In this embodiment, the radius is the same at all positions of the same assembly 1, that is, the radius of the pilot-hole drill rod changes abruptly. In other embodiments, several assemblies 1 with gradually changing radii can be provided between two assemblies 1 with different radii for transition, so that the radius change of the pilot hole drill rod is gradual.

[0039] Please see Figure 1 and Figure 2 The rod section 11 has inner and outer layers. One end of the inner layer extends axially to form a connecting sub-end 113, and the other end of the outer layer extends axially to form a connecting female end 111. The connecting female end 111 of the rod section 11 has a circular first through hole 112, and two oppositely arranged first through holes 112 form a group. The connecting female end 111 of the rod section 11 is fitted onto the outer layer of the connecting sub-end 113 of the adjacent rod section 11, and their structures are mutually compatible. The connecting sub-end 113 of the rod section 11 has a second through hole 114 that is positionally fitted to the first through hole 112. The connector 2 passes through both a corresponding group of first through holes 112 and a group of second through holes 114, achieving mutual fixation between adjacent rod sections 11. In this embodiment, the connecting female end 111 of the rod section 11 has two groups of first through holes 112, and the connecting sub-end 113 of the rod section 11 has two groups of second through holes 114, which helps to improve the connection strength.

[0040] The interior of rod section 11 is hollow, used to house the cement grout pipe connected to the drill bit. A continuous spiral cutter blade 121 is connected to the outer wall of rod section 11. The ends of the spiral cutter blades 121 located at both ends of rod section 11 are flush in the axial direction, thus connecting the spiral cutter blades 121 of adjacent rod sections 11 end-to-end, thereby making the spiral cutter blades 121 of the entire pilot hole drill rod continuous.

[0041] Please see Figure 2 and Figure 3 The connecting member 2 includes a first pin 21 and a second pin 22 that cooperate with each other. Both the first pin 21 and the second pin 22 have a limiting portion 211 and a through portion 212 that are connected to each other. The limiting portion 211 is constructed as a rectangular plate, and the through portion 212 is constructed as a cylinder with one end fixedly connected to the center of the limiting portion 211, passing sequentially through the first through hole 112 and the second through hole 114 from the outside of the rod section 11. The end of the through portion 212 of the first pin 21 away from the limiting portion 211 is constructed as a hollow cylinder with threads formed on its inner wall, and the end of the through portion 212 of the second pin 22 away from the limiting portion 211 is constructed as a screw. The end of the through portion 212 of the second pin 22 away from the limiting portion 211 is screwed into the through portion 212 of the first pin 21, and they are connected to each other by tightening.

[0042] In this embodiment, a gasket 3 is also provided. Before the first pin 21 and the second pin 22 are inserted into the rod section 11, they pass through the gasket 3, so that the gasket 3 is clamped between the limiting part 211 of the first pin 21 or the second pin 22 and the outer wall of the rod section 11. The gasket 3 is made of flexible silicone material, which helps to fill the gap between the flat limiting part 211 and the curved rod section 11, protects the connection between the first pin 21 and the second pin 22, and prevents disassembly difficulties caused by cement adhesion and solidification. During disassembly, if the connector 2 is adhered to the outer wall of the rod section 11 by cement, it can be disassembled by destroying the structure of the gasket 3.

[0043] This embodiment also includes a protective sleeve 4 to protect the joint between adjacent rod sections 11. The protective sleeve 4 is a flexible structure, formed in this embodiment by wrapping multiple layers of tape around the joint. This prevents cement from penetrating into the joint between adjacent rod sections 11, which would make disassembly difficult due to direct connection between adjacent rod sections 11. During disassembly, it can be removed by damaging the structure.

[0044] Please see Figure 1In this embodiment, all assemblies 1 are structurally identical except for the assembly 1 closest to the drill bit. The difference between the assembly 1 closest to the drill bit and the other assemblies 1 is that the spiral cutter blade 121 of the assembly 1 closest to the drill bit is wider, resulting in a larger radius, and is only located at the end away from the drill bit. Multiple mixing blades 122 are connected to the end closest to the drill bit. The mixing blades 122 are constructed as long, straight strips, with one end connected to the outer wall of the rod and extending away from the rod, to improve mixing capacity and ensure that the cement slurry discharged from the drill bit is thoroughly and evenly mixed with the soil.

[0045] Example 2:

[0046] The only difference between this embodiment and Embodiment 1 is that in this embodiment, the assembly 1 closest to the drill bit is only provided with a spiral cutter blade 121.

[0047] Example 3:

[0048] The only difference between this embodiment and embodiment two is that in this embodiment, the assembly 1 closest to the drill bit is also provided with a spiral cutter blade 121 at the end closest to the drill bit, and multiple spiral cutter blades 121 are distributed among the multiple spiral cutter blades 121.

[0049] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0050] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A pilot hole drill pipe, characterized in that, It includes multiple assembly parts (1), and the assembly part (1) includes a hollow cylindrical rod section (11) and blade leaves circumferentially connected to the outer wall of the rod section (11). The rod section (11) has a connecting sub-end (113) and a connecting mother-end (111) opposite to the connecting sub-end (113). The connecting sub-ends (113) of multiple rod sections (11) are respectively detachably connected to the connecting mother-ends (111) of adjacent rod sections (11) to form a rod body. The rod body is configured to be hollow and cylindrical. The blade leaves include spiral blade leaves (121) configured to be continuously spiral. The hole-leading drill rod has a first end (101) close to the drill bit and a second end (102) opposite to the first end (101). The radius of the first end (101) of the hole-leading drill rod is greater than the radius of the second end (102).

2. The pilot hole drill pipe according to claim 1, wherein The length of the rod body is any value within 30m to 40m, and the thickness of the blade leaves is any value within 15mm to 25mm.

3. The pilot hole drill pipe according to claim 1, characterized in that, The connecting mother-end (111) of the rod section (11) is sleeved outside the connecting sub-end (113) of the rod section (11). The connecting mother-end (111) of the rod section (11) is provided with a first through hole (112), and the connecting sub-end (113) of the rod section (11) is provided with a second through hole (114) that fits the first through hole (112). A connecting piece (2) simultaneously passes through a set of oppositely arranged first through holes (112) and a set of oppositely arranged second through holes (114), and the connecting piece (2) is detachably connected to the connecting sub-end (113) and the connecting mother-end (111) of adjacent rod sections (11).

4. The pilot hole drill pipe according to claim 3, wherein The connecting piece (2) includes a first pin rod (21) and a second pin rod (22) that cooperate with each other. Both the first pin rod (21) and the second pin rod (22) have a limiting part (211) and a passing part (212) that are connected to each other. The limiting part (211) abuts against the outer wall of the connecting mother-end (111) of the rod section (11). One end of the passing part (212) is connected to the limiting part (211) and sequentially passes through the first through hole (112) and the second through hole (114). The ends of the passing parts (212) of the first pin rod (21) and the second pin rod (22) away from the limiting part (211) are detachably connected.

5. The pilot hole drill pipe according to claim 4, characterized in that, The end of the passing part (212) of the first pin rod (21) away from the limiting part (211) is configured to be a hollow columnar shape with internal threads formed on the inner wall, and the end of the passing part (212) of the second pin rod (22) away from the limiting part (211) is configured to be a screw rod shape.

6. The pilot hole drill pipe according to claim 4, wherein, It further includes a gasket (3), and the gasket (3) is arranged between the outer wall of the connecting mother-end (111) of the rod section (11) and the limiting part (211) of the first pin rod (21) and / or the second pin rod (22).

7. The pilot hole drill pipe according to claim 1, characterized in that, It further includes a protective sleeve (4), and the protective sleeve (4) is sleeved on the joint between adjacent rod sections (11).

8. The pilot hole drill pipe according to claim 1, wherein, The cutter blade further includes a stirring cutter blade (122), and the stirring cutter blade (122) is configured to be strip-shaped, with one end connected to the outer wall of the rod body and extending away from the rod body.

9. The pilot hole drill pipe according to claim 8, wherein, A plurality of the stirring cutter blades (122) are provided at the first end (101) of the pilot drill pipe.

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