Soil-squeezing hole-forming device
By installing a sleeve and a corbel at the interface between the drill rod and the drill bit, the problem of negative pressure in the pile hole is solved, the integrity and working efficiency of the pile hole are ensured, the loose soil structure and the entry of impurities are prevented, and the burden on the static pile driver is reduced.
Patent Information
- Application Number
- CN202423267559.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-12-27
AI Technical Summary
During the lifting process of the drill rod in the existing compaction pile construction device, the negative pressure in the pile hole is obvious, which leads to loose soil structure and the entry of moisture and impurities, increasing the burden of the static pressure pile driver. The problem is particularly serious in collapsible soil and miscellaneous fill.
A soil-squeezing and hole-forming device was designed, which includes a drill rod, an expansion chassis, a sleeve and a corbel. The sleeve is installed at the interface between the drill rod and the drill bit, and the corbel is fixed to the side wall of the drill bit. The expansion chassis is sleeved on the drill bit. The expansion chassis is hung on the corbel under the action of its own weight, avoiding the formation of negative pressure and preventing the soil structure from being attracted and impurities from entering.
It effectively prevents negative pressure in the pile hole, avoids loose soil structure and impurities from entering, improves the integrity and work efficiency of the drilling hole, and reduces the burden on the static pressure pile driver.
Smart Images
Figure CN223482604U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of pile foundation technology, specifically to a soil-displacement hole-forming device. Background Technology
[0002] Soil squeezing drilling requires a rod-type structure paired with a drilling tool to squeeze and drill downwards until a hole is formed. Depending on the specific requirements, different processes and operations can be selected for this type of soil squeezing drilling. However, because it can effectively strengthen the soil structure around the pile and further improve the stability of the pile, it has been widely used.
[0003] Existing compaction pile construction equipment mostly uses static pressure pile drivers for lifting and lowering via clamping and pulling. During the lifting process, the negative pressure inside the pile hole is significant, which not only places an additional burden on the static pressure pile driver but also attracts soil structure from the inner wall of the pile hole. This allows moisture and impurities in the soil to easily enter the pile hole through soil gaps, resulting in loosening of the soil structure inside the pile hole and relaxation of the hole wall. This problem is particularly severe in collapsible soils and mixed fill. Therefore, a solution to address these issues is needed to meet the demands of the industry. Summary of the Invention
[0004] This application provides a soil-squeezing hole-forming device, which can solve the technical problem that the negative pressure inside the pile hole is very obvious during the drilling rod lifting process, which not only brings additional burden to the static pressure pile driver, but also attracts the soil structure of the inner wall of the pile hole.
[0005] This application provides a soil-displacement drilling device, comprising: at least one drill rod section and a soil-displacement device. When the drill rod has only one section, the drill bit is located at the bottom end of the drill rod; when the drill rod has multiple sections, the sections are connected sequentially, with the drill bit located at the bottom end of the lowest drill rod. The soil-displacement device includes an expanding base plate, a sleeve, and a bracket. The sleeve is installed at the junction of the drill rod and the drill bit. The bracket is fixed to the side wall of the drill bit and has a gap between it and the sleeve. The expanding base plate is sleeved on the drill bit, with a portion of the expanding base plate located between the bracket and the sleeve.
[0006] In one embodiment, the expansion plate is a ring structure, with its inner diameter being larger than the maximum outer diameter of the drill bit and smaller than the outer diameter of the sleeve.
[0007] In one embodiment, the inner diameter of the expansion plate is smaller than the maximum lateral length of the bracket and the drill bit.
[0008] In one embodiment, under normal conditions, the expanding plate is inclined, with one side contacting the outer wall of the drill bit between the bracket and the sleeve; the other side hangs down naturally and contacts the outer wall of the drill bit, with the contact position of the other side lower than the bracket; when the soil squeezing hole-forming device squeezes soil downwards, the other side of the expanding plate gradually rises, forming a gap with the outer wall of the drill bit.
[0009] In one embodiment, the sleeve has a groove that engages with the end of the drill rod, and the outer diameter of the sleeve is larger than the outer diameter of the drill rod.
[0010] In one embodiment, the sleeve has an internal thread on its inner side, which is threaded to the end of the drill rod, and the outer diameter of the sleeve is larger than the outer diameter of the drill rod.
[0011] In one embodiment, the support leg is a tapered steel block that is wider at the top and narrower at the bottom, and is welded to the side wall of the drill bit.
[0012] In one embodiment, the drill rod is a hollow steel pipe.
[0013] In one embodiment, when the number of drill rods is multiple sections, adjacent drill rods are fixed together by welding.
[0014] In one embodiment, the surface of the soil extrusion hole-forming device is covered with an anti-rust coating.
[0015] The beneficial effects of the technical solutions provided in this application include:
[0016] By setting at least one section of drill rod, the length of the drill rod can be freely adjusted according to the drilling depth, which is more conducive to drilling operations and improves work efficiency. By setting a drill bit at the bottom of the lowest drill rod and installing a sleeve at the junction of the drill rod and the drill bit, not only can the connection between the drill rod and the drill bit be strengthened, but the underbody plate can also be prevented from moving up the drill rod and falling off during the soil squeezing process.
[0017] By fixing the bracket to the side wall of the drill bit with a gap between it and the sleeve, and placing the expanding plate on the drill bit with part of the expanding plate between the bracket and the sleeve, the expanding plate, under its own weight, "hangs" on the bracket on one side and contacts the outer wall of the drill bit during the upward lifting of the soil-squeezing hole device after the soil squeezing is completed. This avoids the formation of negative pressure in the pile hole, ensuring the integrity of the pile hole and facilitating the smooth removal of the soil-squeezing hole device from the pile hole. This solves the technical problem in related technologies where significant negative pressure occurs in the pile hole during the lifting of the drill rod, which not only brings additional burden to the static pressure pile driver but also affects the soil structure of the inner wall of the pile hole. Attached Figure Description
[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 This is a schematic diagram of the soil-dispatch hole-forming device in its normal state (when lifted upwards) in the embodiments of this application;
[0020] Figure 2 This is a schematic diagram of the soil-squeezing hole-forming device squeezing soil downwards in an embodiment of this application.
[0021] In the picture:
[0022] 1. Drill pipe;
[0023] 2. Drill bit;
[0024] 3. Soil squeezing device; 31. Expanded base plate; 32. Sleeve; 33. Bracket. Detailed Implementation
[0025] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present application.
[0026] This application provides a soil-squeezing hole-forming device, which can solve the technical problem that during the lifting process of the drill rod 1, the negative pressure inside the pile hole is very obvious, which not only brings additional burden to the static pressure pile driver, but also attracts the soil structure of the inner wall of the pile hole.
[0027] In one embodiment, reference is made to Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the soil-dispatch hole-forming device in its normal state (when lifted upwards) in the embodiments of this application; Figure 2 This is a schematic diagram of the soil-squeezing hole-forming device squeezing soil downwards in an embodiment of this application. Figure 1 and Figure 2As shown, the soil-displacement drilling device includes at least one drill rod section 1 and a soil-displacement device 3. When the drill rod 1 has only one section, the drill bit 2 is located at the bottom end of the drill rod 1; when the drill rod 1 has multiple sections, the multiple drill rod sections are connected in sequence, and the bottom end of the lowest drill rod 1 is provided with a drill bit. The soil-displacement device 3 includes an expanding base plate 31, a sleeve 32, and a bracket 33. The sleeve 32 is installed at the junction of the drill rod 1 and the drill bit 2. The bracket 33 is fixed to the side wall of the drill bit 2 and has a gap between it and the sleeve 32. The expanding base plate 31 is sleeved on the drill bit 2, and part of the expanding base plate 31 is located between the bracket 33 and the sleeve 32.
[0028] When the depth of the pile hole is small, a single section of drill rod 1 is used in conjunction with the soil squeezing device 3. The bottom end of the drill rod 1 is equipped with a drill bit 2. When the depth of the pile hole is large, a multi-section drill rod 1 is used in conjunction with the soil squeezing device 3. The multi-section drill rod 1 is connected in sequence. The connection method includes, but is not limited to, threaded connection, welding and fastener connection. The bottom end of the lowest drill rod 1 is equipped with a drill bit 2.
[0029] In this embodiment, by setting at least one section of drill rod 1, and with a drill bit 2 at the bottom end of the lowest section of drill rod 1, the length of drill rod 1 can be flexibly adjusted according to the on-site construction environment, which is more conducive to drilling operations and improves work efficiency. The soil squeezing device 3 includes an expanding base plate 31, a sleeve 32, and a bracket 33. By installing the sleeve 32 at the junction of the drill rod 1 and the drill bit 2, the connection between the drill rod 1 and the drill bit 2 can be strengthened. In addition, the bracket 33 is fixed to the side wall of the drill bit 2, with a gap between it and the sleeve 32. The expanding base plate 31 is sleeved on the drill bit 2, and part of the expanding base plate 31 is located between the bracket 33 and the sleeve 32.
[0030] When the soil-squeezing hole-forming device squeezes soil downwards, the expanding plate 31 horizontally abuts against the end of the sleeve 32, compacting the soil below and thus forming a pile hole. The sleeve 32 can prevent the expanding plate 31 from moving upwards. By having the expanding plate 31 contact the soil layer in advance, the resistance between the soil layer and the drill rod 1 is reduced, and the diameter of the hole is also increased.
[0031] When the soil squeezing hole-forming device is lifted upwards, that is, when the soil squeezing hole-forming device is in its normal state, the expansion plate 31 is set at an angle, with one side hanging on the bracket 33 on the outer wall of the drill bit 2 and the other side hanging freely, thus forming a gap with the inner wall of the pile hole. This gap can reduce the negative pressure in the pile hole until it approaches atmospheric pressure, thereby avoiding additional burden on the static pressure pile driver and no longer attracting the soil structure of the inner wall of the pile hole. It effectively prevents water and impurities in the soil from entering the pile hole through the soil gaps, improves the looseness of the soil structure of the inner wall of the pile hole, and solves the technical problem that the negative pressure in the pile hole is very obvious during the lifting process of the drill rod 1, which not only brings additional burden to the static pressure pile driver, but also attracts the soil structure of the inner wall of the pile hole.
[0032] like Figure 1 and Figure 2 As shown, in some embodiments, the expanding plate 31 is a ring structure with an inner diameter greater than the maximum outer diameter of the drill bit 2 and smaller than the outer diameter of the sleeve 32. In this embodiment, the expanding plate 31 is a ring structure with an inner diameter greater than the maximum outer diameter of the drill bit 2. This ensures that the expanding plate 31 can move flexibly on the drill bit 2. That is, when the soil-squeezing hole-forming device squeezes soil downwards, the soil drilled out by the drill bit 2 will push the expanding plate 31 to a horizontal position until it touches the end face of the sleeve 32. At this time, the inner diameter of the expanding plate 31 is smaller than the outer diameter of the sleeve 32, which can prevent the expanding plate 31 from moving upwards and thus disengage along the drill rod 1.
[0033] like Figure 1 As shown, in some embodiments, the inner diameter of the expanding base plate 31 is smaller than the maximum lateral length of the bracket 33 and the drill bit 2. In this embodiment, the inner diameter of the expanding base plate 31 is smaller than the maximum lateral length of the bracket 33 and the drill bit 2. In this way, when the soil squeezing hole-forming device is lifted upward, the expanding base plate 31 can be well locked, preventing it from falling due to its own weight, and it will not produce large deformation.
[0034] like Figure 1 and Figure 2 As shown, in some embodiments, under normal conditions, the expanding plate 31 is inclined, with one side contacting the outer wall of the drill bit 2 between the bracket 33 and the sleeve 32; the other side hangs down naturally and contacts the outer wall of the drill bit 2, with the contact position of the other side lower than the bracket 33. When the soil-squeezing hole-forming device squeezes soil downwards, the other side of the expanding plate 31 gradually rises, forming a gap with the outer wall of the drill bit 2. In this embodiment, under normal conditions, the expanding plate 31 of the soil-squeezing hole-forming device is in an inclined state, with one side contacting the outer wall of the drill bit 2 between the bracket 33 and the sleeve 32, and the other side hanging down naturally and contacting the outer wall of the drill bit 2, with the contact position of the other side lower than the bracket 33. At this time, the expanding plate 31 is equivalent to being "hung" on the bracket 33, and due to its size, the expanding plate 31 will not fall. When the soil-squeezing hole-forming device squeezes soil downwards, the drill bit 2 continuously drills downwards, and the extruded soil gradually lifts the expanding plate 31 until it contacts the sleeve 32, forming a gap between the expanding plate 31 and the outer wall of the drill bit 2. When the soil-squeezing hole-forming device is lifted upwards, it operates as usual, and will not be described in detail here. This avoids placing additional burden on the static pressure pile driver, prevents the soil structure inside the pile hole from being attracted, and prevents water and impurities in the soil from entering the pile hole through soil gaps, thus improving the looseness of the soil structure inside the pile hole and reducing the loosening of the hole wall.
[0035] like Figure 1 and Figure 2As shown, in some embodiments, the sleeve 32 has a groove inside to engage with the end of the drill pipe 1, and the outer diameter of the sleeve 32 is larger than the outer diameter of the drill pipe 1. In this embodiment, by providing a groove inside the sleeve 32 and engaging with the end of the drill pipe 1, the connection between the drill pipe 1 and the sleeve 32 is made more secure, effectively preventing the drill pipe 1 from loosening or falling off during operation, thereby improving the stability and safety of drilling operations. The outer diameter of the sleeve 32 is larger than the outer diameter of the drill pipe 1, which allows the sleeve 32 to have a larger contact area in the wellbore, helping to maintain stability in complex formations and reducing accidents such as stuck pipe caused by formation factors.
[0036] like Figure 1 and Figure 2 As shown, in some embodiments, the inner side of the sleeve 32 is provided with internal threads, which are threadedly connected to the end of the drill pipe 1. The outer diameter of the sleeve 32 is larger than the outer diameter of the drill pipe 1. In this embodiment, by providing internal threads on the inner side of the sleeve 32 and threadedly connecting it to the end of the drill pipe 1, the connection between the drill pipe 1 and the sleeve 32 is made more secure, effectively preventing the drill pipe 1 from loosening or falling off during operation, thereby improving the stability and safety of drilling operations. The outer diameter of the sleeve 32 is larger than the outer diameter of the drill pipe 1, which allows the sleeve 32 to have a larger contact area in the wellbore, helping to maintain stability in complex formations and reducing accidents such as stuck pipe caused by formation factors.
[0037] like Figure 1 and Figure 2 As shown, in some embodiments, the support bracket 33 is a tapered steel block that is wider at the top and narrower at the bottom, welded to the side wall of the drill bit 2. In this embodiment, the expanding plate 31 is relatively heavy. By using a tapered steel block that is wider at the top and narrower at the bottom, the support bracket 33 can be welded to the side wall of the drill bit 2 to effectively hold the expanding plate 31 in place without causing significant deformation.
[0038] like Figure 1 and Figure 2 As shown, in some embodiments, drill rod 1 is a hollow steel pipe. In this embodiment, compared with solid steel, hollow steel pipe is lighter in weight while maintaining a certain strength, making drill rod 1 more convenient to handle, install and use, reducing the labor intensity of operators and improving work efficiency.
[0039] like Figure 1 and Figure 2As shown, in some embodiments, when the number of drill rods 1 is multi-section, adjacent drill rods 1 are fixed together by welding. In this embodiment, when the number of drill rods 1 is multi-section, adjacent drill rods 1 are fixed together by welding, which ensures that the gap between adjacent drill rods 1 is completely sealed, thereby improving the sealing performance between adjacent drill rods 1. In addition, compared with other connection methods (such as threaded connections, clamp connections, etc.), welding has a simpler and more compact structure. This helps to reduce the weight and volume of the connecting parts of the drill rods 1, and reduce the overall manufacturing and transportation costs of the drill rods 1. At the same time, the simple connection structure also means fewer potential failure points, reducing the difficulty of maintenance and repair. In addition, the welded connection of the drill rods 1 reduces the safety risks caused by loosening or breakage during operation.
[0040] like Figure 1 and Figure 2 As shown, in some embodiments, the surface of the soil extrusion hole-forming device is coated with an anti-rust coating. In this embodiment, by coating the surface of the soil extrusion hole-forming device with an anti-rust layer, it not only has anti-corrosion function but also a certain degree of wear resistance.
[0041] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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 application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" 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; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.
[0042] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0043] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.
Claims
1. A soil-displacement hole-forming device, characterized in that, include: At least one drill rod (1) has a drill bit (2) at the bottom end of the lowest drill rod (1); The soil squeezing device (3) includes an expanding base plate (31), a sleeve (32) and a bracket (33). The sleeve (32) is installed at the junction of the drill rod (1) and the drill bit (2). The bracket (33) is fixed to the side wall of the drill bit (2) and has a gap between it and the sleeve (32). The expanding base plate (31) is sleeved on the drill bit (2) and part of the expanding base plate (31) is located between the bracket (33) and the sleeve (32).
2. The soil-draining hole-forming device as described in claim 1, characterized in that, The expansion plate (31) is a circular ring structure, with its inner diameter being larger than the maximum outer diameter of the drill bit (2) and smaller than the outer diameter of the sleeve (32).
3. The soil-draining hole-forming device as described in claim 2, characterized in that, The inner diameter of the expanded base plate (31) is smaller than the maximum lateral length of the bracket (33) and the drill bit (2).
4. The soil-draining hole-forming device as described in claim 3, characterized in that, In normal conditions, the expansion plate (31) is inclined, and the contact position of one side with the outer wall of the drill bit (2) is between the bracket (33) and the sleeve (32); the other side hangs down naturally and contacts the outer wall of the drill bit (2), and the contact position of the other side is lower than the bracket (33). When the soil-squeezing hole-forming device squeezes soil downwards, the other side of the expanding plate (31) gradually rises, forming a gap between it and the outer wall of the drill bit (2).
5. The soil-draining hole-forming device as described in claim 1, characterized in that, The sleeve (32) has a groove inside, which is engaged with the end of the drill rod (1), and the outer diameter of the sleeve (32) is larger than the outer diameter of the drill rod (1).
6. The soil-displacement hole-forming device as described in claim 1, characterized in that, The sleeve (32) has an internal thread on its inner side and is threaded to the end of the drill rod (1). The outer diameter of the sleeve (32) is larger than the outer diameter of the drill rod (1).
7. The soil-draining hole-forming device as described in claim 1, characterized in that, The cow leg (33) is a tapered steel block that is wider at the top and narrower at the bottom, and is welded to the side wall of the drill bit (2).
8. The soil-draining hole-forming device as described in claim 1, characterized in that, The drill rod (1) is a hollow steel pipe.
9. The soil-draining hole-forming device as described in claim 1, characterized in that, When the number of drill rods (1) is multiple, adjacent drill rods (1) are fixed together by welding.
10. The soil-draining hole-forming device according to any one of claims 1-9, characterized in that, The surface of the soil extrusion hole forming device is covered with an anti-rust coating.