A rotary drilling pile hole verticality correction device, rotary drilling rig and correction method

Abstract

The application discloses a rotary drilling pile hole verticality correction device, which comprises a rotary drilling rod, a drill bit with an open lower end, a core drill and a core drill fixing structure, the rotary drilling rod is internally hollow, a core drill hole matched with the core drill is arranged at a rod head of the rotary drilling rod, the core drill hole is in communication with the internal hollow structure of the rotary drilling rod, the core drill can be inserted into the core drill hole and extend into the internal hollow structure of the rotary drilling rod, a fixing hole for fixing the core drill is arranged on the surface of the rotary drilling rod, a positioning hole is arranged at the top of the upper end of the core drill, the core drill is fixed by being inserted into the positioning hole of the rotary drilling rod and the core drill through the core drill fixing structure, and a side soil cutting structure is arranged on the outer surface of the drill bit.

Description

Technical Field

[0001] This invention belongs to the field of pile foundation construction, specifically relating to a rotary drilling pile hole verticality correction device, a rotary drilling rig, and a construction method. Background Technology

[0002] Because pile foundations are widely used in modern construction, the verticality deviation of pile holes often occurs due to the need to apply reaction force to the foundation during rotary drilling. The traditional approach is to backfill the pile hole and then re-drill in the same location. This method is inefficient and the backfill material has low strength, which cannot provide sufficient horizontal reaction force to the drill bit. As a result, the verticality deviation of the pile hole still does not meet the requirements after re-excavation. The new process uses a steel core drill as a guide and provides horizontal reaction force, so that the drill bit can drill in the direction of the core drill, and the corrected pile hole meets the design requirements. Summary of the Invention

[0003] The present invention aims to address the problem that the verticality deviation of pile holes often occurs in the prior art. The traditional approach is to backfill the pile hole and then re-drill in the same location. This method is inefficient and has the problem that the backfill material has low strength and cannot provide sufficient horizontal reaction force to the drill bit, resulting in the verticality deviation of the pile hole still not meeting the requirements after re-excavation.

[0004] To address the aforementioned deficiencies or improvement needs of existing technologies, this invention specifically relates to a rotary drilling pile hole verticality correction device, comprising a rotary drilling rod, a drill bit with an open lower end, a core drill, and a core drill fixing structure. The rotary drilling rod has a hollow internal structure, and a core drill hole is provided at the rod head to cooperate with the core drill. The core drill hole is connected to the hollow internal structure of the rotary drilling rod, and the core drill can be inserted into the core drill hole and extend into the interior of the rotary drilling rod. The surface of the rotary drilling rod is provided with a fixing hole for fixing the core drill. A positioning hole is provided at the top of the upper end of the core drill. The core drill is not connected to the interior of the drill rod, but is fixed by the core drill fixing structure being inserted laterally into the positioning hole of the rotary drilling rod and the core drill. The outer surface of the drill bit is provided with a side soil-cutting structure.

[0005] Furthermore, the rotary drilling rod is a drill rod with an enlarged diameter.

[0006] Furthermore, the side cutting structure is a cutting bullet head with cutting teeth evenly distributed on the outer surface of the drill bit.

[0007] Furthermore, the lower end sidewall of the drill bit has serrations to facilitate excavation.

[0008] Furthermore, the core drill fixing structure is a pin.

[0009] Furthermore, multiple fixing holes are fixedly provided in the longitudinal direction of the rotary drilling rod to fix the core drill at different longitudinal positions inside the rotary drilling rod.

[0010] Furthermore, the outer side of the square slot where the drill bit connects to the rotary drill rod is provided with reinforcing material.

[0011] As another aspect of the invention, a rotary drilling rig is also provided, which is equipped with the rotary drilling pile hole verticality correction device described above.

[0012] In summary, compared with the prior art, the above-described technical solutions conceived by this invention can achieve the following beneficial effects:

[0013] (1) The rotary drilling pile hole verticality correction device of the present invention, after drilling a hole at the bottom of the pile hole with a core drill, inserts the core drill at the bottom of the pile hole as a guide rod. The core drill and the drilling machine provide a horizontal reaction force to the drill bit to remove the excess part of the inclined pile hole, so that the pile hole meets the verticality requirements.

[0014] (2) The rotary drilling pile hole verticality correction device of the present invention uses a core drill as a guide and is combined with a new type of drill bit, which is both economical and practical; it avoids the increase in construction period and cost caused by re-drilling the pile hole after backfilling. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a preferred embodiment of the present invention, showing the core drill drilling out of the guide hole as the drill rod rotates.

[0016] Figure 2 This is a schematic diagram of the structure for perpendicularity correction after adding a novel drill bit in a preferred embodiment of the present invention;

[0017] Figure 3 This is a schematic diagram of the core drilling structure in a preferred embodiment of the present invention;

[0018] Figure 4 This is a schematic diagram of the structure of the core drill and the core drill hole being installed in a preferred embodiment of the present invention;

[0019] Figure 5 This is a schematic diagram of the preferred embodiment of the present invention, showing the drill bit mounted on the rotary drilling rod.

[0020] Figure 6 This is a schematic diagram of the drill bit structure according to a preferred embodiment of the present invention;

[0021] In the diagram: 1-rotary drill rod; 11-core drill hole; 12-fixed hole; 2-drill bit (new type of drill bit); 21-cutting tooth bullet head; 22-square slot; 23-reinforcing material; 3-core drill; 4-core drill fixing structure. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0023] Example 1:

[0024] Please refer to Figures 1-4 This embodiment relates to a rotary drilling pile hole verticality correction device, including a rotary drilling rod 1, a drill bit 2 with an open lower end, a core drill 3, and a core drill fixing structure 4. The rotary drilling rod 1 has a hollow internal structure, and a core drill hole 11 is provided at the rod head of the rotary drilling rod 1 to cooperate with the core drill 3. The core drill hole 11 is connected to the hollow internal structure of the rotary drilling rod 1, and the core drill 3 can be inserted into the core drill hole 11 and extend into the interior of the rotary drilling rod 1. The surface of the rotary drilling rod 1 is provided with a fixing hole 12 for fixing the core drill 3, and a positioning hole is provided at the top of the upper end of the core drill 3. The core drill 3 can extend or retract independently. The core drill 3 is fixed by the core drill fixing structure 4 being inserted laterally into the positioning hole of the rotary drill rod 1 and the core drill. (In the fixed state, the core drill 3 can rotate and drill together with the drill rod 1. To facilitate the rotation of the core drill 3, ball bearings or bearings can be embedded inside the drill rod 1. When the core drill 3 rotates, it contacts the ball bearings or bearings to reduce friction. In the unfixed state, the core drill 3 does not rotate and drill together with the drill rod 1.) The core drill fixing structure 4 can be a pin or other device that can axially fix the core drill 3.

[0025] As a preferred embodiment, since the correction mainly involves cutting soil from the side, a side-cutting structure is provided on the outer surface of the drill bit 2 to improve cutting efficiency. The side-cutting structure consists of cutting tooth bullets 21 evenly distributed on the outer surface of the drill bit 2, which enhance the side-cutting efficiency. The cutting tooth bullets have a streamlined conical structure, with a retaining spring in the middle to prevent them from falling off, and the tooth tips are made of hard alloy material, which is wear-resistant and increases pressure.

[0026] As a preferred option, to facilitate installation and increase structural strength, the rotary drilling rod 1 is a drill rod with an enlarged diameter.

[0027] As a preferred embodiment, the drill bit has serrations on its two-end sidewalls to facilitate excavation (not shown in the figure).

[0028] As a preferred embodiment, multiple fixing holes 12 are fixedly provided in the longitudinal direction of the rotary drilling rod 1 to fix the core drill at different longitudinal positions inside the rotary drilling rod.

[0029] Example 2:

[0030] Unlike Embodiment 1, the square slot 22 where the drill bit 2 connects to the rotary drill rod 1 is provided with a reinforcing member 23 on the outside, which further enhances the mechanical strength of the connection between the drill bit 2 and the rotary drill rod 1.

[0031] Example 3:

[0032] As another aspect of the present invention, based on the embodiment of the rotary drilling pile hole verticality correction device, this embodiment relates to a rotary drilling rig equipped with the above-mentioned rotary drilling pile hole verticality correction device.

[0033] In another aspect, the present invention relates to a method for correcting the verticality of rotary drilling pile holes, comprising the following steps:

[0034] Step 1: In pile holes with verticality problems, conduct measurements and lay out the lines. Use instruments to mark the center of the pile position corresponding to the correct verticality and mark it as the drilling position of the guide hole.

[0035] Step 2: Position the drilling rig and park it at the drilling location;

[0036] Step 3: Align the core drill 3 of the drilling rig with the guide hole drilling position determined in Step 1, and fix it with the pin 4 so that the core drill rotates with the drill rod at the guide hole drilling position;

[0037] Step 4: Drill a core hole using a rotary drill rod 1 to drive the core drill 3 to drill a guide hole;

[0038] Step 5: Install drill bit 2. After the guide hole is formed, pull the core drill 3 out of the pile hole and install the new drill bit.

[0039] Step 6: Insert the core drill 3, pull out the pin connecting the core drill 3 to the drill rod so that the core drill 3 does not rotate with the drill rod, and at the same time rely on its own weight and the positioning of the drilling machine to make the core drill 3 fall into the guide hole (at this time, the core drill acts as a guide device to orient the drill bit 2, so that the drill bit 2 will not change the drilling direction due to the lateral pressure of the soil during the drilling process).

[0040] Step 7: Drilling: The core drill 3 is used as a guide to make the drill bit advance in the direction of the core drill. The side cutting structure is used to cut the soil on the side until the verticality of the pile hole is corrected.

[0041] Step 8: Drilling and verifying verticality. After the pile hole is drilled to meet the requirements, clean the hole and check whether the verticality meets the requirements.

[0042] This invention uses a core drill as a guide and is combined with a new type of drill bit, which is both economical and practical. It avoids the increase in construction time and cost caused by re-drilling backfill pile holes and has great potential for widespread application.

[0043] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A device for correcting the verticality of rotary drilling pile holes, characterized in that, Includes rotary drilling rod (1) and drill bit with open lower end. (2) Core drill (3) and core drill fixing structure (4): The rotary drilling rod (1) has a hollow internal structure. The head of the rotary drilling rod (1) is provided with a core drill hole (11) that mates with the core drill (3). The core drill hole (11) is connected to the hollow internal structure of the rotary drilling rod (1). The core drill (3) can be inserted into the core drill hole (11) and extend into the rotary drilling rod (1). The surface of the rotary drilling rod (1) is provided with a fixing hole (12) for fixing the core drill (3). The top of the upper end of the core drill (3) is provided with a positioning hole. It can be extended or retracted independently. The core drill fixing structure (4) is inserted laterally into the positioning hole of the rotary drilling rod (1) and the core drill for fixing. In the fixed state, the core drill (3) can rotate and drill together with the rotary drilling rod (1). In order to facilitate the rotation of the core drill (3), the rotary drilling rod (1) can be inlaid with balls or set with bearings. When the core drill (3) rotates, it contacts the balls or bearings to reduce friction. In the unfixed state, the core drill (3) does not rotate and drill together with the rotary drilling rod (1). The outer surface of the drill bit (2) is provided with a side cutting structure.

2. The rotary drilling pile hole verticality correction device according to claim 1, characterized in that, The rotary drilling rod (1) is a drill rod with an enlarged diameter.

3. The rotary drilling pile hole verticality correction device according to claim 1, characterized in that, The side cutting structure is a cutting bullet head (21) with teeth evenly distributed on the outer surface of the drill bit (2).

4. The rotary drilling pile hole verticality correction device according to claim 1, characterized in that, The drill bit (2) has serrations on the lower side wall to facilitate excavation.

5. The rotary drilling pile hole verticality correction device according to claim 4, characterized in that, The core drill fixing structure (4) is a pin.

6. The rotary drilling pile hole verticality correction device according to claim 4, characterized in that, Multiple fixing holes (12) are fixedly provided in the longitudinal direction of the rotary drilling rod (1) to fix the core drill at different longitudinal positions inside the rotary drilling rod.

7. The rotary drilling pile hole verticality correction device according to claim 4, characterized in that, The square slot (22) where the drill bit (2) connects with the rotary drill rod (1) is provided with a reinforcing member (23) on the outside.

8. A rotary drilling rig for correcting the verticality of rotary drilling pile holes, characterized in that: The rotary drilling rig is equipped with the rotary drilling pile hole verticality correction device as described in any one of claims 1-6.

9. A method for correcting the verticality of rotary drilling pile holes, characterized in that: Includes the following steps: Step 1: In pile holes with verticality problems, conduct measurements and lay out the lines. Use instruments to mark the center of the pile position corresponding to the correct verticality and mark it as the drilling position of the guide hole. Step 2: Position the drilling rig and park it at the drilling location; Step 3: Align the core drill (3) of the drilling rig with the guide hole drilling position determined in Step 1, and fix it with a pin so that the core drill rotates with the drill rod at the guide hole drilling position; Step 4: Drill a core hole using a rotary drill rod (1) to drive the core drill (3) to drill a guide hole; Step 5: Install drill bit (2). After the guide hole is formed, pull the core drill (3) out of the pile hole and install drill bit (2). Step 6: Insert the core drill (3), pull out the pin connecting the core drill (3) to the drill rod so that the core drill (3) does not rotate with the drill rod, and at the same time rely on its own weight and the positioning of the drilling machine to make the core drill (3) fall into the guide hole; Step 7: Drilling: The core drill (3) is used as a guide to make the drill bit advance in the direction of the core drill. The side cutting structure is used to cut the soil on the side until the verticality of the pile hole is corrected. Step 8: Drilling and verifying verticality. After the pile hole is drilled to meet the requirements, clean the hole and check whether the verticality meets the requirements.

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