Static pressure pile sinking guide hole drill bit

Abstract

The utility model provides a static pressure pile sinking guide hole drill bit, and belongs to the technical field of drill bits. The static pressure pile sinking guide hole drill bit comprises a connector and a drill rod. A slurry guiding channel connected with the slurry recycling pool and a grouting channel connected with the grouting pump are arranged in the connector, and one end of the connector is connected with the drilling machine. One end of the drill rod is fixed to the other end of the connector, a pipeline penetrating through the drill rod in the length direction is arranged in the drill rod and comprises a first pipeline penetrating through the grouting channel and a second pipeline penetrating through the slurry guiding channel, and first cutting blades spirally distributed in the length direction of the drill rod are arranged on the outer side face of the drill rod. According to the static pressure pile sinking hole guiding drill bit, when grouting is conducted into a drill hole through the first pipeline connected with the grouting pipeline, sandy soil with high water content in a foundation is guided out through the first pipeline connected with the slurry guiding pipeline and guided to the slurry recycling pool, the content of water in the drill hole is reduced, and the drilling quality is improved. And continuous collapse of sandy soil with high water content in the drilling process of the drill bit is avoided.

Description

Technical Field

[0001] This utility model relates to the field of drill bit technology, and in particular to a static pressure pile driving borehole drill bit. Background Technology

[0002] Precast piles are widely used in the construction engineering field due to their high bearing capacity, fast construction speed, easy quality assurance, and wide applicability. They are especially useful in areas with poor geological conditions and insufficient foundation bearing capacity. By driving or pressing precast piles into the foundation, the bearing capacity of the foundation can be improved, ensuring the stability and safety of the overall building structure.

[0003] During building construction, in order to stably install precast piles in the foundation, a long spiral drilling rig is used to drill holes and remove soil to release ground stress. Simultaneously, grout is injected into the holes, and then the precast piles are installed using static pressure driving. After the grout hardens, it fills the gap between the precast pile and the foundation, improving the stability of the precast piles installed in the foundation.

[0004] To improve construction efficiency, the existing long spiral drilling rigs include grouting pipelines in their drill bits. While drilling the foundation, the rig can inject grout into the hole. After drilling and grouting are completed, precast piles are installed in the hole.

[0005] However, if the backfill at the construction site is thick and the groundwater content is abundant, the existing long spiral drill bit is prone to causing the borehole to collapse and become blocked when drilling for soil extraction, which reduces the efficiency of static pressure pile driving construction. At the same time, the collapse of the borehole will make it impossible to guarantee the quality of pile driving construction. Utility Model Content

[0006] One objective of this invention is to provide a static pressure pile driving borehole drill bit that solves the problem of easy borehole collapse when existing long spiral drill bits are used for borehole drilling and soil extraction in water-rich layers.

[0007] Specifically, embodiments of this application provide a static pressure pile driving pre-hole drill bit, comprising:

[0008] The connector has an internal grout inlet channel connected to the grout recovery tank and a grout injection channel connected to the grout pump, and one end of the connector is connected to the drilling rig.

[0009] A drill rod, one end of which is fixed to the other end of the connector, has a pipe running through its length inside, including a first pipe running through the grouting channel and a second pipe running through the grouting channel, and a first cutting blade spirally distributed along the length of the drill rod on its outer surface.

[0010] Furthermore, the first pipeline is a connecting pipe disposed inside the drill rod, the outer diameter of the connecting pipe being smaller than the inner diameter of the drill rod, and the second pipeline is a gap defined by the outer side wall of the connecting pipe and the inner side wall of the drill rod.

[0011] Furthermore, the static pressure pile driving drill bit also includes a tip disposed at the end of the drill rod away from the connector.

[0012] Furthermore, the tip is rotatable.

[0013] Furthermore, the drill pipe is detachably connected to the connector.

[0014] Furthermore, the drill pipe is threadedly connected to the connector.

[0015] The beneficial effects of this utility model are:

[0016] 1. The static pressure pile driving borehole drill bit of this utility model, while injecting grout into the borehole through the first pipeline connected to the grouting pipeline, simultaneously draws out the sand with high water content in the foundation through the second pipeline connected to the grout channel and directs it to the grout recovery pool, thereby reducing the water content in the borehole and preventing the sand with high water content from continuously collapsing during the drilling process.

[0017] 2. By setting the first pipeline as a connecting pipe installed inside the drill rod with the outer diameter of the connecting pipe being smaller than the inner diameter of the drill rod, and setting the second pipeline as the gap defined by the outer wall of the connecting pipe and the inner wall of the drill rod, the injection and extraction of grout are ensured to be more uniform, the stress on the drill rod is also more uniform, and the construction process is ensured to be more stable.

[0018] 3. Along the length of the first pipeline, one or more first connecting rods are provided between the outer wall of the first pipeline and the inner wall of the drill pipe. The reinforcement provided by the first connecting rods prevents the first pipeline from shaking under the impact of the slurry during the injection of high-velocity slurry into the borehole, thus ensuring the stability of the first pipeline after installation.

[0019] 4. The drill rod and connector are designed to be detachable. When blockage occurs in the grouting channel, grouting channel, first pipeline or second pipeline, the drill bit and drill rod can be separated to clear the blockage.

[0020] 5. By making the tip rotatable and further providing a second cutting blade on the outer wall of the tip, the drilling efficiency of the drill bit is enhanced. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a static pressure pile driving borehole drill bit according to an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the tip being mounted on a base according to an embodiment of the present invention.

[0023] In the picture:

[0024] 100-Static pressure pile driving borehole drill bit; 1-Connector; 2-Drill rod; 3-Grouting channel; 4-Grouting channel; 5-First pipeline; 6-Second pipeline; 7-First cutting blade; 8-First connecting rod; 9-Tip; 10-Base; 11-Second connecting rod. Detailed Implementation

[0025] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0026] The terms “comprising” and “having”, and any variations thereof, used in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0027] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0028] Please refer to Figure 1 The static pressure pile driving borehole drill bit 100 of this utility model includes a connector 1 and a drill rod 2. The connector 1 has a grout channel 3 connected to a grout recovery tank (not shown) and a grouting channel 4 connected to a grouting pump (not shown). One end of the connector 1 is connected to a drilling rig (not shown). One end of the drill rod 2 is fixed to the other end of the connector 1. The drill rod 2 has a pipe running through its length, including a first pipe 5 communicating with the grouting channel 4 and a second pipe 6 communicating with the grout channel 3. First cutting blades 7 are spirally distributed along the length of the drill rod 2 on its outer surface.

[0029] When using the static pressure pile driving drill bit 100 of this utility model, while the drill bit is drilling into the foundation, the sand and mud with high water content in the foundation are drawn out through the second pipeline 6 and the grouting channel 3 and directed to the grout recovery tank, reducing the water content in the borehole and preventing the sand and mud with high water content from continuously collapsing during the drilling process. Simultaneously, after drilling is completed, grout is injected into the borehole through the grouting channel 4 connected to the grouting pump, improving construction efficiency. After grouting is completed, the precast pile is installed in the borehole.

[0030] In one embodiment, the first pipe 5 is vertically arranged on one side of the drill rod 2, and the second pipe 6 is vertically arranged on the other side of the drill rod 2.

[0031] Please see Figure 1 and Figure 2 In another embodiment, the drill rod 2 has a hollow interior. The first pipe 5 is a connecting pipe located in the central part of the drill rod 2. Simultaneously, the outer diameter of the first pipe 5 is smaller than the inner diameter of the drill rod 2, creating a gap between the first pipe 5 and the drill rod 2. The second pipe 6 is the gap defined by the outer wall of the first pipe 5 and the inner wall of the drill rod 2. During grouting, grout is injected into the borehole through the first pipe 5, while sand with a higher water content is drawn out through the gap between the outer wall of the first pipe 5 and the inner wall of the drill rod 2 and directed to the grout recovery tank. Unlike the embodiment described above where the first pipe 5 and the second pipe 6 are located on opposite sides of the drill rod 2, the different injection and extraction rates of the grout result in uneven stress on the drill rod 2 when the injection and extraction occur on different sides, making the operation difficult to control. In comparison, the arrangement in this embodiment ensures more uniform injection and extraction of grout, and more uniform stress on drill rod 2, thus ensuring a more stable construction process.

[0032] During implementation, due to the high flow velocity of the slurry in the first pipeline 5, the impact of the high-velocity slurry causes significant shaking in the first pipeline 5, affecting its stability when installed on the drill bit. Therefore, please refer to... Figure 2 In one embodiment, one or more first connecting rods 8 are provided between the outer wall of the first pipeline 5 and the inner wall of the drill rod 2 along the length direction of the first pipeline 5. The first connecting rods 8 reinforce the pipeline, preventing it from shaking under the impact of grout during the injection of grout into the borehole at a high flow rate. In another embodiment, multiple through holes (not shown) are symmetrically arranged along the circumference of the drill rod 2. The first connecting rods 8 are bolts installed in the through holes. After the first pipeline 5 is inserted into the drill rod 2, the bolts are tightened, causing the multiple bolts to symmetrically abut against the first pipeline 5 circumferentially. This bolt support prevents the first pipeline 5 from shaking during grouting.

[0033] Please see again Figure 1 and Figure 2 The static pressure pile driving drill bit 100 of this utility model also includes a tip 9 disposed at the end of the drill rod 2 away from the connector 1. During drilling on the foundation, some foundations are hard or encounter rocks, which can severely affect the drilling efficiency. The tip 9 at the end of the drill rod 2 away from the connector 1 increases the pressure between the drill bit and the foundation, thus improving drilling efficiency and facilitating construction. There are various ways to install the tip 9. In one embodiment, as shown in the figure, the tip 9 is installed on a base 10, which is fixed to the inner wall of the first pipeline 5 by a second connecting rod 11. Grout passes through the gaps between the second connecting rods 11. This arrangement ensures that the tip 9 is installed at the center of the end of the drill rod 2, guaranteeing uniform force during drilling and allowing grout to be injected into the borehole.

[0034] In one embodiment, the tip 9 is rotatable. By providing a rotatable tip 9, the drilling efficiency of the tip 9 is further improved.

[0035] In another embodiment, a second cutting blade (not shown) is provided on the side surface of the tip 9 to further improve the drilling efficiency of the drill bit.

[0036] In the static pressure pile driving drill bit 100 of this utility model, the drill rod 2 and the connector 1 are detachably connected. By making the drill rod 2 and connector 1 detachable, grout may become trapped in the pipeline after the drill bit has been working for a period of time, affecting the grouting and grouting operations. By making the drill rod 2 and connector 1 detachable, when blockages occur in the grouting channel 3, grouting channel 4, first pipeline 5, or second pipeline 6, the drill bit can be separated from the drill rod 2 to clear the blockages in these channels.

[0037] In one embodiment, a drill rod 2 is threadedly connected to a connector 1. In other embodiments, the drill rod 2 and the connector 1 may be connected by a snap-fit ​​or a sleeve.

[0038] 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 static pressure pile driving borehole drill bit, characterized in that, include: The connector has an internal grout inlet channel connected to the grout recovery tank and a grout injection channel connected to the grout pump, and one end of the connector is connected to the drilling rig. A drill rod, one end of which is fixed to the other end of the connector, has a pipe running through its length inside, including a first pipe running through the grouting channel and a second pipe running through the grouting channel, and a first cutting blade spirally distributed along the length of the drill rod on its outer surface.

2. The static pressure pile driving drill bit according to claim 1, characterized in that, The first conduit is a connecting pipe disposed inside the drill rod, the outer diameter of the connecting pipe being smaller than the inner diameter of the drill rod, and the second conduit is a gap defined by the outer wall of the connecting pipe and the inner wall of the drill rod.

3. The static pressure pile driving drill bit according to claim 2, characterized in that, It also includes a tip located at the end of the drill pipe away from the connector.

4. The static pressure pile driving drill bit according to claim 3, characterized in that, The tip is rotatable.

5. The static pressure pile driving drill bit according to claim 1, characterized in that, The drill pipe is detachably connected to the connector.

6. The static pressure pile driving drill bit according to claim 5, characterized in that, The drill rod is threadedly connected to the connector.

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