Rotary drilling foundation pile coring bit

Abstract

The utility model relates to the technical field of foundation pile construction, and discloses a rotary drilling foundation pile coring bit which comprises a drilling barrel, a residue filtering plate is arranged at the upper end of the drilling barrel, a drilling rod connecting sleeve is arranged at the upper end of the residue filtering plate, flow guide wings are arranged on the outer wall of the drilling barrel, and a hob bearing bottom plate and a hob are arranged at the lower end of the drilling barrel. According to the device, the flow guide wings can be protected, and the situation that the flow guide wings are clamped in rock gaps during drill lifting during batter pile driving is avoided; and meanwhile, the residues can be guided out upwards, and the residue guiding-out efficiency is improved.

Description

Technical Field

[0001] This application relates to the technical field of cast-in-place pile construction, and particularly to a core drill bit for a rotary drilling cast-in-place pile. Background Art

[0002] In recent years, rotary drilling rigs have been increasingly widely used in pile foundation construction. Its working principle is mainly to drive the drill pipe and drill bit to rotate through the power head, use the cutting tools of the drill bit to cut and excavate the soil layer, and at the same time load the cut soil residues into the drill bit bucket. After the drill bucket is full, it is lifted out of the hole to unload the soil, and the hole is formed in such a cycle.

[0003] The Chinese utility model patent with the patent number CN219826719U discloses a drill tool for underwater core drilling of columns, and discloses a new core drill bit. The hob below it is arranged in an inclined manner, increasing the crushing area, and at the same time, a diversion wing is correspondingly arranged to timely guide the crushed residues upward.

[0004] In view of the above related technologies, in the actual use process, due to the relatively large crushing area and the relatively large width of the diversion wing, the diversion wing is prone to damage during actual use; especially in the working condition of inclined pile driving, when lifting the drill, the diversion wing is easy to get stuck in the rock gap, affecting normal construction. If the drill is forcibly lifted, it may also cause the diversion wing to break. Utility Model Content

[0005] In order to protect the diversion wing and prevent the diversion wing from getting stuck in the rock gap when lifting the drill for inclined pile driving, this application provides a core drill bit for a rotary drilling cast-in-place pile.

[0006] This application provides a core drill bit for a rotary drilling cast-in-place pile, and adopts the following technical solutions:

[0007] A core drill bit for a rotary drilling cast-in-place pile includes a drill barrel. A filter plate is arranged at the upper end of the drill barrel, a drill pipe connecting sleeve is arranged at the upper end of the filter plate, a diversion wing is arranged on the outer wall of the drill barrel, a hob supporting bottom plate and a hob are arranged at the lower end of the drill barrel, and a protective sleeve is sleeved outside the diversion wing.

[0008] By adopting the above technical solutions, the hob breaks the rock, and the diversion wing can guide the soil or rock fragments upward, reducing the resistance during the drilling process; the protective sleeve is arranged to protect the diversion wing, which is also beneficial to guiding the residues upward, improving the residue guiding efficiency, and at the same time, it can prevent the diversion wing from getting stuck in the rock gap during the drill lifting process, especially in the case of inclined pile driving.

[0009] Optionally, a stop collar is arranged at the upper end of the protective sleeve, and the stop collar is inclined upward towards the central axis of the drill barrel.

[0010] By adopting the above technical solution, when the drill is lifted upward, the anti - jamming cylinder can prevent the upper end of the protective sleeve from being easily jammed by rocks during drill lifting, thereby improving the drill - lifting efficiency.

[0011] Optionally, the inclination angle of the anti - jamming cylinder towards the central axis of the drill cylinder is 15° - 25°.

[0012] Optionally, the protective sleeve is provided with water overflow holes, and a plurality of water overflow holes are uniformly arranged along the side wall of the protective sleeve.

[0013] By adopting the above technical solution, setting the overflow holes can timely discharge the mud or water flow generated during the drilling process, avoid accumulation on the diversion wings, thereby reducing the weight and wear of the overall structure; at the same time, it can also prevent the problem of the drill bit rotating automatically caused by the water flow during drill lifting, resulting in locking of the machine.

[0014] Optionally, wear - resistant protection strips are arranged on the outer wall of the protective sleeve, the wear - resistant protection strips are spirally arranged along the protective sleeve, and the side wall of the wear - resistant protection strip is an arc surface.

[0015] By adopting the above technical solution, the protective sleeve can be protected by setting the protection strips, improving the service life of the protective sleeve.

[0016] Optionally, it further includes fixing parts. Multiple groups of cutter - roller supporting bottom plates are arranged along the circumferential direction of the drill cylinder. The lower end of the protective sleeve is provided with connecting pieces. A plurality of groups of connecting pieces are circumferentially arranged on the protective sleeve corresponding to the cutter - roller supporting bottom plates, and the connecting pieces are respectively abutted against the cutter - roller supporting bottom plates, and the fixing parts can fix the connecting pieces on the cutter - roller supporting bottom plates.

[0017] By adopting the above technical solution, through the setting of the fixing parts and the connecting pieces, a stable connection between the cutter - roller supporting bottom plate and the protective sleeve is realized, and at the same time, the detachable connection of the protective sleeve is realized, so that the protective sleeve can be disassembled and assembled according to the working conditions.

[0018] Optionally, the inner side of the connecting piece extends to the inner side of the protective sleeve. The fixing part includes a first bolt and a first nut. The first bolt can sequentially pass through the cutter - roller supporting bottom plate and the connecting piece upward and be threadedly connected with the first nut.

[0019] By adopting the above technical solution, this fixing method is simple and reliable, and can effectively fix the connecting piece on the cutter - roller supporting bottom plate.

[0020] Optionally, the outer side of the connecting piece extends to the outer side of the protective sleeve. The fixing part further includes a fixing sleeve and a second bolt. The side wall of the fixing sleeve is provided with a clamping groove for clamping the cutter - roller supporting bottom plate and the connecting piece. The second bolt can sequentially pass through the fixing sleeve and the cutter - roller supporting bottom plate from bottom to top and be threadedly connected with the upper part of the fixing sleeve.

[0021] By adopting the above technical solution, such a setting can further increase the connection strength between the connecting plate and the hob supporting bottom plate. At the same time, through the connection and fixation with the protective sleeve, the external force borne by the first bolt and the first nut can be reduced, and its service life can be improved.

[0022] Optionally, the clamping groove extends along the length direction of the fixing sleeve and penetrates through the side wall at one end of the fixing sleeve.

[0023] By adopting the above technical solution, such a design of the clamping groove enables the hob supporting bottom plate and the connecting piece to be more easily inserted into the fixing sleeve.

[0024] Optionally, the upper surface of the fixing sleeve is an inclined surface, and the upper surface of the fixing sleeve inclines towards the direction of the protective sleeve.

[0025] By adopting the above technical solution, the upper surface of the fixing sleeve is preferably set as an inclined surface, so that it is not easy to get stuck in the rock when lifting the drill upward.

[0026] In summary, the present application includes at least one of the following beneficial effects:

[0027] 1. By arranging a protective sleeve outside the diversion wing, the diversion wing can be protected, and it is beneficial to export the residue upward, improving the export efficiency of the residue; at the same time, during the process of lifting the drill when driving an inclined pile, the protective sleeve can also prevent the diversion wing from getting stuck in the rock, thereby improving the construction efficiency;

[0028] 2. By arranging structures such as a fixing sleeve and bolts for connection, the detachable installation of the protective sleeve can be realized. Description of the Drawings

[0029] Figure 1 is a schematic structural diagram of a core drill bit;

[0030] Figure 2 is a schematic cross-sectional structural diagram of a core drill bit;

[0031] Figure 3 is an exploded structural diagram of a fixing member.

[0032] Description of the reference numerals: 1, drill barrel; 2, drill pipe connecting sleeve; 3, diversion wing; 4, hob supporting bottom plate; 5, hob; 6, protective sleeve; 61, anti-clamping cylinder; 62, water overflow hole; 63, connecting piece; 7, wear-resistant protection strip; 8, fixing member; 81, first bolt; 82, first nut; 83, fixing sleeve; 84, second bolt. Detailed Description of the Embodiment

[0033] The following will further elaborate on the present application in conjunction with the attached Figures 1-3 for a more detailed description.

[0034] Embodiment 1:

[0035] The embodiments of the present application disclose a core drilling bit for a rotary drilling rig foundation pile. Referring to Figure 1 and Figure 2 , the core drilling bit includes a drill barrel 1. A slag filtering plate is welded and fixed to the upper end of the drill barrel 1, and a drill pipe connecting sleeve 2 for connecting a drill pipe is welded to the upper end of the slag filtering plate. A diversion wing 3 is provided on the outer wall of the drill barrel 1. A hob supporting bottom plate 4 is welded to the lower end of the drill barrel 1. A plurality of hob supporting bottom plates 4 are arranged at intervals along the circumferential direction of the drill barrel 1. In this embodiment, three are provided; a hob 5 is fixed to the hob supporting bottom plate 4 by welding. Three hobs 5 are set as a group on each hob supporting bottom plate 4, and the cutting edges of the three hobs 5 are staggered inside and outside to obtain a larger crushing area. A protective sleeve 6 is sleeved outside the diversion wing 3. The upper and lower ends of the protective sleeve 6 extend along the length direction of the drill barrel 1, so as to protect all the diversion wings 3 and prevent the diversion from being stuck in the rock gap during drill pipe lifting, causing damage to the diversion wing 3, enhancing the overall reliability and durability of the core drilling bit for a rotary drilling rig foundation pile, and thus improving the drilling efficiency. At the same time, in cooperation with the protective sleeve 6 and the diversion wing 3, it is beneficial to export the residue upward and improve the export efficiency of the residue.

[0036] Referring to Figure 1 and Figure 2 , in this embodiment, the protective sleeve 6 is preferably made of a high-strength material, such as stainless steel or alloy steel, etc., to ensure its structural stability and durability. A stop cylinder 61 is provided at the upper end of the protective sleeve 6. The cross-section of the stop cylinder 61 is circular. The stop cylinder 61 is inclined upward towards the central axis of the drill barrel, and the inclination angle of the stop cylinder 61 towards the central axis of the drill barrel 1 is 15° - 25°, and preferably can be set to 20°. The lower surface of the stop cylinder 61 and the protective sleeve 6 are preferably fixed by welding, and the connection between the two is overly smooth. Thus, when lifting the drill pipe, since the outer diameter of the upper end of the stop cylinder 61 is smaller, it is not easily stuck, that is, it can make the upper end of the protective sleeve 6 not easily stuck to the rock during drill pipe lifting, improve the drill pipe lifting efficiency, and reduce the resistance received by the protective sleeve 6 and the diversion wing 3 during the drill pipe lifting process. The lower end of the protective sleeve 6 abuts against the hob supporting bottom plate 4, and the protective sleeve 6 and the hob supporting bottom plate 4 can be fixed by welding.

[0037] In other embodiments, in order to increase the stability of the stop cylinder 61, a connecting rod can also be welded to the inner wall of the stop cylinder 61, and the connecting rod is detachably fixed to the drill pipe connecting sleeve 2 by means of bolts or the like. At the same time, between the stop cylinder 61 and the protective sleeve 6, it can also be fixed by means of bolts or the like, so as to facilitate replacing the stop cylinder 61 with different inclination angles under different working conditions, or replacing it with a new one when it is damaged.

[0038] Referring to Figure 1 and Figure 2, in this embodiment, the protective sleeve 6 is provided with overflow holes 62. A plurality of overflow holes 62 are uniformly arranged along the side wall of the protective sleeve 6. Specifically, the overflow holes can be circular holes or square holes, and a plurality of them are arranged at intervals along the length direction of the protective sleeve 6 and are also arranged along the circumferential direction of the protective sleeve 6. The arrangement of the overflow holes can timely discharge the mud or water flow generated during the drilling process, prevent accumulation on the guide vane 3, thereby reducing the weight and wear of the overall structure; at the same time, it can also prevent the problem of the drill bit rotating automatically due to water flow during the drill lifting, which may cause the locking of the machine.

[0039] Refer to Figure 1 and Figure 2 , in this embodiment, a wear-resistant protective strip 7 is further provided on the outer wall of the protective sleeve 6. The wear-resistant protective strip 7 is spirally arranged on its outer side surface along the protective sleeve 6, and its outer side wall is arc-shaped. The wear-resistant protective strip 7 can be made of stainless steel and can be fixed by welding. By setting the protective strip, the protective sleeve 6 can be protected, and the service life of the protective sleeve 6 can be improved.

[0040] The implementation principle of the core drilling bit for a rotary drilling rig foundation pile in this application embodiment is as follows: On the basis of the original core drilling bit, the protective sleeve 6 is sleeved on the outside of the guide vane 3 from top to bottom, and the protective sleeve 6 is fixed. During the rotary drilling process, the hob 5 below the drill barrel 1 breaks the rock formation, and the broken slag is exported upward along the guide vane 3. At the same time, the mud or water flow contained in the slag can be discharged from the overflow holes of the protective sleeve 6. When the drill is lifted after the rotary drilling is completed, under the action of the protective sleeve 6, the guide vane 3 will not get stuck between the rocks, making the drill lifting process smooth and the construction efficiency high.

[0041] Embodiment 2:

[0042] The difference between this application embodiment and Embodiment 1 lies in the fixing method of the protective sleeve 6. In this embodiment, the protective sleeve 6 is installed and fixed in a detachable manner. Refer to Figure 1 and Figure 3 , a connecting piece 63 is fixed to the lower end of the protective sleeve 6 by welding. The connecting piece 63 extends along the lower surface of the protective sleeve 6; a plurality of hob supporting bottom plates 4 are arranged along the circumferential direction of the drill barrel 1. A plurality of connecting pieces 63 are arranged in one-to-one correspondence with the hob supporting bottom plates 4, and each connecting piece 63 can abut against the hob supporting bottom plate 4. The core drilling bit further includes a fixing member 8, and the fixing member 8 can fix the connecting piece 63 on the supporting bottom plate.

[0043] Refer to Figure 3In this embodiment, the inner side of the connecting piece 63 extends inside the protective cover 6, and the fixing member 8 includes a first bolt 81 and a first nut 82. The first bolt 81 can be sequentially passed through the hob support base plate 4 and the connecting piece 63 upwards, and is threadedly connected with the first nut 82, thereby fixing the connecting piece 63 to the hob support base plate 4. Multiple groups of the first bolts 81 and the first nuts 82 are arranged at intervals along the extending direction of the connecting piece 63. It should be noted that since a seat for mounting the hob 5 is fixed on the lower surface of the hob support base plate 4, the first bolts 81 need to be arranged at a staggered position from the installation position of the hob 5.

[0044] Reference Figure 3 In this embodiment, the outer side of the connecting piece 63 also extends outside the protective sleeve 6, and the fixing member 8 also includes a fixing sleeve 83 and a second bolt 84. Among them, the fixing sleeve 83 is an arc-shaped structure as a whole, and a clamping groove is provided on its inner side wall, so that the cross-section of the fixing sleeve 83 is a "]" shape, and the outer side of the connecting plate and the roller support base plate 4 can be clamped into the clamping groove. The clamping groove extends in the length direction of the fixing sleeve 83 and passes through the side wall of one end of the fixing sleeve 83. When installing, the connecting piece 63 can be fixed by the first bolt 81 and the first nut 82, and then the opening of the clamping groove is aligned with one end of the connecting piece 63 and clamped, so that the fixing sleeve 83 is clamped to the outer side of the connecting plate and the roller support base plate 4. The second bolt 84 can pass through the lower end of the fixing sleeve 83 and the roller support base plate 4 from bottom to top, and be threadedly connected with the upper end of the fixing sleeve 83.

[0045] Further, the upper surface of the fixing sleeve 83 is preferably set to an inclined surface, so that it is not easy to get stuck in the rock when the drill is lifted upward. It should be noted that the outer position of the fixing sleeve 83 needs to be within the crushing range of the roller cutter 5 to ensure the smooth operation of the equipment.

[0046] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A core drilling bit for a rotary drilling rig foundation pile, comprising a drill barrel (1), a filter slag plate is arranged at the upper end of the drill barrel (1), and a drill pipe connecting sleeve (2) is arranged at the upper end of the filter slag plate, characterized in that: A diversion wing (3) is provided on the outer wall of the drill pipe. A hob support bottom plate (4) and a hob (5) are provided at the lower end of the drill pipe (1). A protective sleeve (6) is sleeved outside the diversion wing (3).

2. The core drilling bit for a rotary drilling foundation pile according to claim 1, characterized in that: A stop cylinder (61) is provided at the upper end of the protective sleeve (6). The stop cylinder (61) is inclined upward in the direction of the central axis of the drill pipe.

3. The core drill bit for a rotary drilling rig foundation pile according to claim 2, characterized in that: The inclination angle of the stop cylinder (61) in the direction of the central axis of the drill pipe (1) is 15°-25°.

4. A core drill bit for a rotary drilling rig foundation pile according to claim 1, characterized in that: Overflow holes (62) are provided on the protective sleeve (6). A plurality of overflow holes (62) are evenly arranged along the side wall of the protective sleeve (6).

5. A core drill bit for a rotary drilling rig foundation pile according to claim 1, characterized in that: A wear-resistant protection strip (7) is provided on the outer wall of the protective sleeve (6). The wear-resistant protection strip is spirally arranged along the protective sleeve (6), and the side wall of the wear-resistant protection strip (7) is an arc surface.

6. A core drill bit for a rotary drilling foundation pile according to any one of claims 1-5, characterized in that: It further includes a fixing member (8). Multiple groups of hob support bottom plates (4) are arranged along the circumferential direction of the drill pipe (1). A connecting piece (63) is provided at the lower end of the protective sleeve (6). Multiple groups of connecting pieces (63) are arranged along the circumferential direction of the protective sleeve (6) corresponding to the hob support bottom plates (4). And the connecting pieces (63) are respectively abutted against the hob support bottom plates (4). The fixing member (8) can fix the connecting pieces (63) to the hob support bottom plates (4).

7. A core drill bit for a rotary drilling rig foundation pile according to claim 6, characterized in that: The inner side of the connecting piece (63) extends inside the protective sleeve (6). The fixing member (8) includes a first bolt (81) and a first nut (82). The first bolt (81) can sequentially pass through the hob support bottom plate (4) and the connecting piece (63) upward, and is threadedly connected to the first nut (82).

8. The core drill bit for rotary drilling foundation piles according to claim 7, wherein: The outer side of the connecting piece (63) extends outside the protective sleeve (6). The fixing member (8) further includes a fixing sleeve (83) and a second bolt (84). A clamping groove for clamping the hob support bottom plate (4) and the connecting piece (63) is provided on the side wall of the fixing sleeve (83). The second bolt (84) can sequentially pass through the fixing sleeve (83) and the hob support bottom plate (4) from bottom to top, and is threadedly connected to the upper end part of the fixing sleeve (83).

9. The core drill bit for rotary drilling foundation piles according to claim 8, characterized in that: The clamping groove extends through to one side wall of the fixing sleeve (83) along the length direction of the fixing sleeve (83).

10. A core drill bit for a rotary drilling rig foundation pile according to claim 8, characterized in that: The upper surface of the fixing sleeve (83) is an inclined surface, and the upper surface of the fixing sleeve (83) is inclined in the direction of the protective sleeve (6).

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