A front cut pile cap rotary drilling bit assembly and rotary drilling device

Abstract

The utility model relates to the technical field of pile foundation construction, specifically, relates to a front intercept method pile cap rotary digging drill bit assembly and rotary digging device, a front intercept method pile cap rotary digging drill bit assembly, it includes assembly body, assembly body includes drill bit, drill bit includes internally hollow and one end opening's cylindrical sleeve, the one end of sleeve inside is close to opening and is equipped with the calibration spare, the calibration spare is used for when the one end of pile body enters the inside of sleeve, the sleeve can have the tendency of keeping coaxial with the pile body. Through the calibration spare of the utility model, when the one end of pile body, i. e. pile head, enters the inside of drill bit, the drill bit can keep coaxial with the pile body, when the drill bit keeps coaxial with the pile body, the pile cap rotary digging can be aligned with the center of pile position, reduces the situation of deviation, improves construction efficiency.

Description

Technical Field

[0001] This utility model relates to the field of pile foundation construction technology, specifically to a drill bit assembly and rotary drilling device for front-end pile cap rotary drilling. Background Technology

[0002] CFG piles, or cement-fly ash-gravel piles, are typically combined with pile caps and are commonly used in high-speed railway subgrade treatment. For CFG pile front-end construction, the selection of the rotary drilling rig should be based on the different pile diameters, pile spacings, and pile cap sizes. Existing rotary drilling rigs mainly consist of a car body, a drive assembly, and a drill bit. The car body and drive assembly drive the drill bit to move and rotate. The drill bit is a hollow cylindrical shape with helical blades on the outside. During rotary drilling of the pile cap, the cylindrical drill bit must be kept coaxial and concentric with the pile body, i.e., aligned with the center of the pile position. If, after pile formation, the pile cap is not aligned with the center of the pile position, it will cause the pile cap and pile body to become misaligned, affecting the bearing capacity and stability of the pile and the foundation.

[0003] In the past, when rotary drilling rigs were used to drill pile caps, technicians would measure and lay out the piles according to the design layout drawings before excavation. However, due to deviations in the pile position during pile foundation construction, and the fact that the front-end pile cap was buried to a certain depth below the soil between the piles, coupled with the fact that the inner diameter of the drill bit was larger than the outer diameter of the pile, it was difficult for construction personnel to accurately judge the center of the pile position during rotary drilling, making it difficult to align the drill bit with the center of the pile position. If it was found after rotary drilling that the pile cap was not aligned with the center of the pile position, additional corrections were required, resulting in low construction efficiency. Utility Model Content

[0004] This utility model provides a drill bit assembly and rotary drilling device for front-end pile cap rotary drilling, which can overcome the shortcomings of the existing technology where it is inconvenient to accurately determine the center of the pile position during pile cap rotary drilling, resulting in low construction efficiency.

[0005] According to the present invention, a drill bit assembly for rotary drilling of pile caps using the front-end method includes an assembly body; the assembly body includes a drill bit; the drill bit includes a cylindrical sleeve that is hollow inside and open at one end; a calibration element is provided at one end of the sleeve near the opening.

[0006] The calibration piece is used to ensure that when one end of the pile enters the sleeve, the sleeve tends to remain coaxial with the pile.

[0007] The calibration component of this invention enables the drill bit to remain coaxial with the pile body when the pile head enters the drill bit. When the drill bit and the pile body are coaxial, the rotary drilling of the pile cap can be aligned with the center of the pile position, reducing the occurrence of deviation and improving construction efficiency.

[0008] Preferably, the calibration component includes a guide tube; the guide tube is hollow inside and has a connection port and a positioning port at both ends; the connection port is used to mate with and connect to one end of the sleeve opening; the positioning port is used to mate with the pile body; a tapered guide surface is formed between the connection port and the positioning port.

[0009] In this invention, the connection port, guide surface, and positioning port are designed so that the size of one end of the guide sleeve matches the size of the opening end of the drill bit, making it easy for the pile head to enter. When the pile head enters, it rubs against the guide surface, and the drill bit moves accordingly until the pile head enters the positioning port. Once the pile head enters the positioning port, the pile body can be kept coaxial with the drill bit. At this time, the drill bit is in the center of the pile position, and the pile cap of accurate size can be dug out by continuing to rotate downwards. Furthermore, when the length of the sleeve is consistent with the designed pile depth, when the pile head touches the other end of the sleeve, it indicates that the designed pile depth has been reached, and the pile cap of standard size and position has been dug out.

[0010] Preferably, a sealing ring is connected to the positioning port; the sealing ring is annular, with the inner ring surface connected to the positioning port and the outer ring surface connected to the inner wall of the guide cylinder.

[0011] In this invention, the sealing ring prevents soil entering the drill bit during rotary drilling from entering the gap between the guide sleeve and the sleeve, thus facilitating subsequent cleaning of the drill bit.

[0012] Preferably, the end of the sleeve away from the opening forms an end cap; the end cap is provided with multiple mounting holes.

[0013] In this invention, the installation hole allows the drill bit to be connected to the drive structure of a conventional rotary drilling equipment.

[0014] Preferably, the outer wall of the sleeve is provided with multiple spiral blades arranged in a ring array.

[0015] In this invention, the spiral blades allow the drill bit to carry out the surrounding soil as it rotates underground, thus cleaning the soil between the piles while simultaneously excavating the pile cap.

[0016] Preferably, the spiral blade has several equally spaced toothed blocks at one end near the sleeve opening.

[0017] In this invention, the toothed block design allows the drill bit to easily drill through rocks, while also increasing the strength of the spiral blades and preventing the thinner ends of the spiral blades from being directly damaged by collision with the rocks.

[0018] A rotary drilling device for rotary drilling of pile caps using the front-cutting method includes a drill bit assembly for rotary drilling of pile caps as described above. Attached Figure Description

[0019] Figure 1This is a bottom perspective view of the drill bit assembly in Example 1;

[0020] Figure 2 This is a top perspective view of the drill bit assembly in Example 1;

[0021] Figure 3 This is a schematic diagram showing the disassembled drill bit assembly in Example 1;

[0022] Figure 4 This is a cross-sectional schematic diagram of the drill bit assembly in Example 1. Detailed Implementation

[0023] To further understand the content of this utility model, a detailed description of the utility model is provided in conjunction with the embodiments. It should be understood that the embodiments are merely illustrative and not limiting of the utility model.

[0024] Example 1

[0025] like Figure 1-4 As shown, this embodiment provides a drill bit assembly for rotary drilling of pile caps using the front-end method, which includes an assembly body 100; the assembly body 100 includes a drill bit 110; the drill bit 110 includes a cylindrical sleeve 111 that is hollow inside and open at one end; a calibration element 120 is provided at one end of the sleeve 111 near the opening.

[0026] The calibrator 120 is used to ensure that the sleeve 111 tends to remain coaxial with the pile body when one end of the pile body enters the sleeve 111.

[0027] The calibration component 120 in this embodiment enables the drill bit 110 to remain coaxial with the pile body when the pile head enters the drill bit 110. When the drill bit 110 is coaxial with the pile body, the rotary drilling of the pile cap can be aligned with the center of the pile position, reducing the occurrence of deviation and improving construction efficiency.

[0028] As can be seen from this embodiment, the drill bit assembly includes a drill bit 110 and a calibration component 120; the drill bit 110 is composed of a sleeve 111, an end cap 214, and a spiral blade 112; the calibration component 120 is composed of a guide tube 321 and a sealing ring 322; the guide tube 321 is a hollow frustum shape, one end of its connection port 3210 is connected to one end of the sleeve 111 of the drill bit 110 by a full welding process, and one end of the positioning port 3212 is connected to the inner ring surface of the sealing ring 322 by a full welding process; the outer ring surface of the sealing ring 322 is connected to the inner wall of the sleeve 111; the calibration component 120 can be welded and assembled first, then the calibration component 120 is welded to one end of the sleeve 111, and finally the end cap 214 is welded, ensuring good visibility during assembly;

[0029] When rotary drilling the pile cap, the drill bit 110 is initially aligned with the pile head by the device, and then the drill bit 110 is moved down to make the pile head contact the guide surface 3211. At this time, the drill bit 110 is moved down to move and calibrate in the same direction until the pile head is aligned with the positioning port 3212. The pile body and the drill bit 110 maintain the same axis, and the rotary drilling of the pile cap can be guaranteed to be in the center of the pile position. Even with different pile diameters, pile spacings and pile cap sizes, the drill bit 110 assembly in this case can automatically center and position for rotary drilling.

[0030] The drill bit assembly in this case has been successfully applied in the construction of the front-end pile cap for a high-speed railway station project. The actual manufacturing process is given below:

[0031] Prepare a sleeve 111 with an inner diameter of 60cm. This inner diameter needs to be 10cm larger than the designed pile diameter. The length of the sleeve 111 is selected according to the rotary drilling depth. The guide tube 321 of the calibration component 120 is made of a steel plate with a width of 20cm. After it is made, the inner diameter of the positioning port 3212 is 52cm. Based on the above, it can be concluded that the designed pile diameter is 50cm, with a 2cm gap error reserved.

[0032] In this embodiment, the calibration component 120 includes a guide tube 321; the guide tube 321 is hollow inside and has a connection port 3210 and a positioning port 3212 formed at both ends; the connection port 3210 is used to mate with and connect to one end of the opening of the sleeve 111; the positioning port 3212 is used to mate with the pile body; a tapered guide surface 3211 is formed between the connection port 3210 and the positioning port 3212.

[0033] Through the configuration of the connection port 3210, guide surface 3211, and positioning port 3212 in this embodiment, the size of one end of the guide sleeve 321 can match the size of one end of the opening of the drill bit 110, which also makes it easy for the pile head to enter. When the pile head enters, it rubs against the guide surface 3211, and the drill bit 110 moves accordingly until the pile head enters the positioning port 3212. When the pile head enters the positioning port 3212, the pile body can be kept coaxial with the drill bit 110. At this time, the drill bit 110 can be in the center of the pile position, and the pile cap of accurate size can be dug out by continuing to rotate downward. When the length of the sleeve 111 is consistent with the design pile depth, when the pile head touches the other end of the sleeve 111, it means that the design pile depth has been reached, and the pile cap of standard size and position has been dug out.

[0034] In this embodiment, a sealing ring 322 is connected to the positioning port 3212; the sealing ring 322 is annular, with its inner ring surface connected to the positioning port 3212 and its outer ring surface connected to the inner wall of the guide cylinder 321.

[0035] By setting the sealing ring 322 in this embodiment, the soil that enters the drill bit 110 during rotary drilling will not enter the gap between the guide tube 321 and the sleeve 111, thus facilitating the subsequent cleaning of the drill bit 110.

[0036] In this embodiment, the end of the sleeve 111 away from the opening forms an end cap 214; the end cap 214 is provided with a plurality of mounting holes 215.

[0037] The mounting hole 215 in this embodiment allows the drill bit 110 to be connected to the drive structure of a conventional rotary drilling equipment.

[0038] In this embodiment, the outer wall of the sleeve 111 is provided with a plurality of spiral blades 112 arranged in a ring array.

[0039] By using the spiral blades 112 in this embodiment, the drill bit 110 can bring out the surrounding soil when it rotates underground, thereby cleaning the soil between the piles while simultaneously drilling the pile cap.

[0040] In this embodiment, the spiral blade 112 is provided with a plurality of equally spaced tooth blocks 113 at one end near the opening of the sleeve 111.

[0041] By setting the tooth block 113 in this embodiment, the drill bit 110 can easily dig when it encounters a rock, while increasing the strength of the spiral blade 112 and preventing the thinner spiral blade 112 from being directly damaged by collision with the rock.

[0042] A rotary drilling device for front-end pile cap rotary drilling includes a drill bit assembly for front-end pile cap rotary drilling as described above; wherein the rotary drilling device is a common pile cap forming machine modified from an excavator, which can be composed of an excavator body, a drive structure, and the drill bit assembly of this invention; the drill bit assembly is connected to the body or drive structure through mounting holes 215; the excavator body is responsible for walking and driving the drill bit assembly to move up, down, left, and right, and the drive structure is responsible for driving the drill bit 110 to rotate; these are conventional technical means in the field and will not be described in detail.

[0043] It is readily understood that those skilled in the art can combine, split, or reorganize the embodiments provided in this application to obtain other embodiments, all of which do not exceed the protection scope of this application.

[0044] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the embodiments shown are only part of the embodiments of the present invention. The actual structure is not limited to this. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A drill bit assembly for rotary drilling of pile caps using the front-end method, characterized in that: The component includes a body (100); the body (100) includes a drill bit (110); the drill bit (110) includes a cylindrical sleeve (111) that is hollow inside and open at one end; a calibration element (120) is provided inside the sleeve (111) near the opening. The calibrator (120) is used to ensure that the sleeve (111) tends to remain coaxial with the pile body when one end of the pile body enters the sleeve (111).

2. The drill bit assembly for rotary drilling of pile caps using the front-end method according to claim 1, characterized in that: The calibration component (120) includes a guide tube (321); the guide tube (321) is hollow inside and has a connection port (3210) and a positioning port (3212) formed at both ends respectively; the connection port (3210) is used to mate with and connect to one end of the opening of the sleeve (111); the positioning port (3212) is used to mate with the pile body; a conical guide surface (3211) is formed between the connection port (3210) and the positioning port (3212).

3. The drill bit assembly for rotary drilling of pile caps using the front-end method according to claim 2, characterized in that: A sealing ring (322) is connected to the positioning port (3212); the sealing ring (322) is annular, with its inner ring surface connected to the positioning port (3212) and its outer ring surface connected to the inner wall of the guide tube (321).

4. The drill bit assembly for rotary drilling of pile caps using the front-end method according to claim 1, characterized in that: The end of the sleeve (111) away from the opening forms an end cap (214); the end cap (214) is provided with a plurality of mounting holes (215).

5. A drill bit assembly for rotary drilling of pile caps using the front-end method according to claim 1, characterized in that: The outer wall of the sleeve (111) is provided with multiple spiral blades (112) arranged in a ring.

6. A drill bit assembly for rotary drilling of pile caps using the front-end method according to claim 5, characterized in that: The spiral blade (112) has several equally spaced toothed blocks (113) at one end near the opening of the sleeve (111).

7. A rotary drilling device for front-end pile cap rotary drilling, characterized in that: Includes a drill bit assembly for rotary drilling of pile caps using the front-cutting method as described in any one of claims 1-6.

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