A three-axis mixing pile machine for SWM method pile construction

Abstract

The present application relates to the technical field of long screw pile drivers and discloses a three-axis mixing pile driver for SWM pile construction, comprising a frame, a drive device fixedly mounted at the bottom of one side of the frame, an output shaft of the drive device fixedly connected to a first sleeve, an auger structure fixedly mounted at the top of the outer surface of an auger rod, the inner cavity of the first sleeve being filled with magnetorheological fluid, a second sleeve fixedly connected to the frame being movably sleeved on the outer surface of the first sleeve, and a permanent magnet being provided on the inner wall of the second sleeve. The present application provides a three-axis mixing pile driver for SWM pile construction, wherein the arrangement of the first sleeve and the second sleeve enables, when the bottom end of the auger rod contacts an obstacle such as a boulder, the impact thereof causes the magnetic field strength of the magnetorheological fluid passing through the first sleeve to decrease, thereby reducing the connection strength between the first sleeve and the auger rod, thereby effectively reducing the impact damage to the auger rod.

Description

Technical Field

[0001] The present application relates to the technical field of long screw pile drivers, and in particular to a three-axis mixing pile driver for SWM method pile construction. Background Art

[0002] A three-axis pile driver is a long screw pile driver that sprays cement into the soil and mixes it thoroughly, thereby hardening the soft soil and improving the foundation strength. It consists of three spiral drills working simultaneously downward. The two spiral drills rotate in the same direction and spray cement, while the center spiral drill rotates in the opposite direction and sprays high-pressure gas to fully mix the cement and soil, forming a cement-soil consolidation body with a certain strength. This plays an important role in the SWM construction process.

[0003] However, during the construction process of existing three-axis mixing pile machines, due to the complexity of the underground soil structure, there are often obstacles such as boulders, which can easily cause severe impacts on the spiral drill bit at the moment of contact. Due to the operating environment (mostly soft soil layers) of the three-axis mixing pile machine, the hardness of the material used in its drill bit is generally low, and it is very easy to be damaged or even break when facing severe impact, which greatly affects the construction progress of the project and has poor stability and reliability.

[0004] Therefore, there is an urgent need for a three-axis mixing pile machine for SWM construction method to solve the defects of the above-mentioned existing three-axis mixing pile machine in the actual construction process. Summary of the Invention

[0005] The present application proposes a three-axis mixing pile machine for SWM method pile construction, which has the advantage of effectively reducing the impact damage caused to the drill bit when it contacts boulders, making the three-axis mixing pile machine more stable and safer during the construction process. It is used to solve the problem that during the construction process of existing three-axis mixing pile machines, due to the complexity of the underground soil structure, there are often obstacles such as boulders, which are very likely to cause severe impacts when contacting the spiral drill bit. Due to the use environment, the hardness of the material used for the drill bit of the three-axis mixing pile machine is generally low, and it is very easy to be damaged or even broken when facing severe impact.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical solution: a three-axis mixing pile machine for SWM pile construction, comprising a frame fixedly mounted on a lifting device of the three-axis mixing pile machine by bolts, three sets of driving devices arranged in a linear array are fixedly mounted on the bottom of one side of the frame, and an auger rod is connected to the internal transmission of the driving device, and the driving devices on the left and right sides drive the auger rods thereon to rotate clockwise, while the driving device in the middle position drives the auger rod thereon to rotate counterclockwise, the output shaft of the driving device is fixedly connected to the first sleeve movably sleeved on the top of the outer surface of the auger rod, and the top of the outer surface of the auger rod and located at the first sleeve An auger structure is fixedly installed in the inner cavity of the sleeve, and the inner cavity of the first sleeve is filled with a full volume of magnetorheological fluid. When the fluid is solidified, a fixed connection can be formed between the first sleeve and the auger rod, thereby transmitting power and driving the auger rod to rotate with the action of the driving device. A second sleeve fixedly connected to the frame is movably sleeved on the outer surface of the first sleeve, and three groups of permanent magnets arranged in a ring array are provided on the inner wall of the second sleeve, thereby forming a flexible transmission connection between the auger rod and the first sleeve, and the impact on the auger rod can be transferred to the magnetorheological fluid, so as to effectively reduce the impact damage on the auger rod.

[0007] Furthermore, three groups of magnetic blocking plates arranged in a ring array are fixedly mounted on the outer surface of the first sleeve, and the second sleeve is transmission-connected to a synchronous motor fixedly mounted on the top of one side of the frame. Initially, the positions of the magnetic blocking plates and the permanent magnets are staggered. Then, under the transmission action of the synchronous motor, the second sleeve is forced to rotate synchronously with the first sleeve, so that the magnetic blocking plates and the permanent magnets are always in a staggered state, and a magnetic field is generated that can pass through the top of the inner cavity of the first sleeve, so that the magnetorheological fluid filled thereon is solidified.

[0008] Furthermore, the top of the first sleeve is provided with a sealing sleeve whose bottom end extends to the top of its inner cavity, and the top of the first sleeve is fixedly installed with a fixing rod whose top end extends to the top of the sealing sleeve, and an elastic part is provided on the outer surface of the fixing rod, and the first sleeve is elastically connected to the sealing sleeve through the fixing rod and the elastic part. When the solidification degree of the magnetorheological fluid on the first sleeve becomes lower and has a certain fluidity, when the frame moves downward with the three-axis mixing pile driver, the magnetorheological fluid can squeeze the sealing sleeve upward and force the auger rod and the first sleeve to be displaced relative to the central axis direction, thereby reducing the impact on the auger rod in the central axis direction.

[0009] Furthermore, an angle sensor is provided between the driving device and the second sleeve, and is used to monitor the rotational displacement difference between the driving device and the transmission shaft of the second sleeve in real time. When a rotational displacement difference occurs between the driving device and the second sleeve due to the impact of the spiral drill rod, the rotational displacement difference between them is eliminated by adjusting the rotational speed of the second sleeve, and the magnetic blocking plate on the first sleeve and the permanent magnet on the second sleeve are again in a staggered state.

[0010] Furthermore, the interior of the auger structure is provided with a plurality of groups of through holes arranged in a circular array and extending vertically therethrough, thereby effectively improving the connection strength between the auger structure on the spiral drill rod and the first sleeve when the magnetorheological fluid on the first sleeve is quasi-solidified.

[0011] Furthermore, a certain gap is left between the top of the auger structure and the top of the inner cavity of the first sleeve, thereby providing a movable space for alleviating the impact on the spiral drill rod in the direction of the central axis.

[0012] Furthermore, the interior of the auger rod is provided with a flow hole whose top end extends to the top thereof, and the bottom end of the flow hole is divided into two and extends to both sides of the bottom of the outer surface of the auger rod respectively. At the same time, the flow holes on the auger rod located on both sides are connected to the high-pressure cement pump, and the flow holes on the auger rod located in the middle position are connected to the high-pressure air pump, and the cement and soil are stirred by the injected high-pressure gas so that they can be fully mixed.

[0013] The beneficial effects of the present invention are as follows:

[0014] The present application provides a three-axis mixing pile machine for SWM pile construction. Regarding the arrangement of the first sleeve and the second sleeve, when the bottom end of the auger rod comes into contact with an obstacle such as a boulder, the rotation speed of the auger rod will drop briefly due to the impact, resulting in a corresponding degree of rotational displacement difference between the first sleeve and the second sleeve, and a corresponding degree of overlap between the magnetic resistance plate and the permanent magnet thereon, causing the magnetic field intensity of the magnetorheological fluid passing through the first sleeve to decrease, and the degree of its solidification to decrease, resulting in a decrease in the connection strength between the first sleeve and the auger rod, and allowing relative rotation between them, thereby effectively reducing the impact damage to the auger rod, making the three-axis mixing pile machine more stable and safe during the construction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only embodiments of the present invention. Those skilled in the art can also derive other drawings based on the provided drawings without inventive work.

[0016] Figure 1 It is a schematic diagram of the structure of the present invention;

[0017] Figure 2 This is a schematic diagram of the installation structure of the spiral drill rod of the present invention;

[0018] Figure 3 The structure of the present invention Figure 1 A is an enlarged schematic diagram;

[0019] Figure 4 It is a front view of the structure of the present invention;

[0020] Figure 5 The structure of the present invention Figure 4 Cross-sectional view at the middle BB.

[0021] In the figure: 1-frame, 2-drive device, 3-auger rod, 4-first sleeve, 5-auger structure, 6-magnetic blocking plate, 7-second sleeve, 8-permanent magnet, 9-synchronous motor, 10-sealing sleeve, 11-fixing rod, 12-elastic member. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] like Figure 1 As shown, a three-axis mixing pile machine for SWM pile construction includes a frame 1 fixedly mounted on a lifting device of the three-axis mixing pile machine by bolts. Three sets of driving devices 2 arranged in a linear array are fixedly mounted on the bottom of one side of the frame 1. The driving devices 2 are internally connected to the spiral drill rods 3, and the driving devices 2 on the left and right sides drive the spiral drill rods 3 thereon to rotate clockwise, while the driving device 2 in the middle position drives the spiral drill rod 3 thereon to rotate counterclockwise. Figure 2 、 Figure 5As shown, the output shaft of the driving device 2 is fixedly connected to the first sleeve 4 which is movably sleeved on the top of the outer surface of the auger rod 3. A screw dragon structure 5 is fixedly installed on the top of the outer surface of the auger rod 3 and in the inner cavity of the first sleeve 4. The inner cavity of the first sleeve 4 is filled with a full volume of magnetorheological fluid. When it is solidified, a fixed connection can be formed between the first sleeve 4 and the auger rod 3, thereby transmitting power and driving the auger rod 3 to rotate with the action of the driving device 2. A second sleeve 7 which is fixedly connected to the frame 1 is movably sleeved on the outer surface of the first sleeve 4, and three groups of permanent magnets 8 arranged in a ring array are provided on the inner wall of the second sleeve 7, thereby forming a flexible transmission connection between the auger rod 3 and the first sleeve 4, and the impact suffered by the auger rod 3 can be transferred to the magnetorheological fluid, so as to effectively reduce the impact damage suffered by the auger rod 3.

[0024] like Figure 4 、 Figure 5 As shown, in this technical solution, three groups of magnetic blocking plates 6 arranged in a ring array are fixedly mounted on the outer surface of the first sleeve 4, and the second sleeve 7 is transmission-connected to a synchronous motor 9 fixedly mounted on the top of one side of the frame 1. Initially, the positions of the magnetic blocking plates 6 and the permanent magnets 8 are staggered. Then, under the transmission action of the synchronous motor 9, the second sleeve 7 is forced to rotate synchronously with the first sleeve 4, so that the magnetic blocking plates 6 and the permanent magnets 8 are always in a staggered state, and a magnetic field is generated that can pass through the top of the inner cavity of the first sleeve 4, so that the magnetorheological fluid filled thereon is solidified.

[0025] When the bottom end of the auger rod 3 comes into contact with an obstacle such as a boulder, the rotation speed of the auger rod 3 will drop briefly due to the impact, resulting in a corresponding degree of rotational displacement difference between the first sleeve 4 and the second sleeve 7, and a corresponding degree of overlap between the magnetic blocking plate 6 and the permanent magnet 8 thereon, causing the magnetic field strength of the magnetorheological fluid passing through the first sleeve 4 to decrease, and the degree of its solidification to decrease, resulting in a decrease in the connection strength between the first sleeve 4 and the auger rod 3, and allowing relative rotation between them, thereby effectively reducing the impact damage to the auger rod 3.

[0026] like Figure 2 、 Figure 3As shown, in the present technical solution, the top end of the first sleeve 4 is provided with a sealing sleeve 10 whose bottom end extends to the top of its inner cavity, and the top end of the first sleeve 4 is fixedly installed with a fixing rod 11 whose top end extends to the top of the sealing sleeve 10, and an elastic member 12 is provided on the outer surface of the fixing rod 11, and the first sleeve 4 is elastically connected to the sealing sleeve 10 through the fixing rod 11 and the elastic member 12. When the solidification degree of the magnetorheological fluid on the first sleeve 4 becomes lower and has a certain fluidity, the frame 1 moves downward with the three-axis mixing pile driver, and the magnetorheological fluid can squeeze the sealing sleeve 10 upward and force the auger rod 3 and the first sleeve 4 to be displaced relative to the central axis direction, thereby reducing the impact on the auger rod 3 in the central axis direction.

[0027] In the present technical solution, an angle sensor is provided between the driving device 2 and the second sleeve 7, and is used to monitor the rotational displacement difference between the driving device 2 and the transmission shaft of the second sleeve 7 in real time. When a rotational displacement difference occurs between the driving device 2 and the second sleeve 7 due to the impact of the spiral drill rod 3, the rotational displacement difference between them is eliminated by adjusting the rotation speed of the second sleeve 7, and the magnetic blocking plate 6 on the first sleeve 4 and the permanent magnet 8 on the second sleeve 7 are again in a staggered state.

[0028] like Figure 2 、 Figure 5 As shown, in the present technical solution, the interior of the auger structure 5 is provided with a plurality of groups of through holes arranged in a circular array and extending upward and downward, thereby effectively improving the connection strength between the auger structure 5 on the spiral drill rod 3 and the first sleeve 4 when the magnetorheological fluid on the first sleeve 4 is quasi-solidified.

[0029] like Figure 4 As shown, in this technical solution, a certain gap is left between the top of the auger structure 5 and the top of the inner cavity of the first sleeve 4, thereby providing a movable space for alleviating the impact on the spiral drill rod 3 in the direction of the central axis.

[0030] In this technical solution, the interior of the auger rod 3 is provided with a flow hole whose top extends to its top, and the bottom end of the flow hole is divided into two and extends to both sides of the bottom of the outer surface of the auger rod 3 respectively. At the same time, the flow holes on the auger rod 3 located on both sides are connected to the high-pressure cement pump, and the flow holes on the auger rod 3 located in the middle position are connected to the high-pressure air pump, and then the cement and soil are stirred by the injected high-pressure gas so that they can be fully mixed.

[0031] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A three-axis mixing pile driver for SWM pile construction, comprising a frame (1), wherein three sets of driving devices (2) arranged in a linear array are fixedly mounted on the bottom of one side of the frame (1), and a spiral drill rod (3) is connected to the inside of the driving device (2) in a transmission manner, characterized in that: The output shaft of the driving device (2) is fixedly connected to a first sleeve (4) movably sleeved on the top of the outer surface of the spiral drill rod (3); a screw dragon structure (5) is fixedly installed on the top of the outer surface of the spiral drill rod (3) and located in the inner cavity of the first sleeve (4); and the inner cavity of the first sleeve (4) is filled with magnetorheological fluid; a second sleeve (7) fixedly connected to the frame (1) is movably sleeved on the outer surface of the first sleeve (4), and three groups of permanent magnets (8) arranged in an annular array are provided on the inner wall of the second sleeve (7); three groups of magnetic blocking plates (6) arranged in an annular array are fixedly installed on the outer surface of the first sleeve (4); the second sleeve (7) is transmission-connected to a synchronous motor (9) fixedly installed on the top of one side of the frame (1), and initially, the positions of the magnetic blocking plates (6) and the permanent magnets (8) are staggered.

2. The three-axis mixing pile driver for SWM pile construction according to claim 1, characterized in that: The top end of the first sleeve (4) is provided with a sealing sleeve (10) whose bottom end extends to the top of its inner cavity, and the top end of the first sleeve (4) is fixedly mounted with a fixing rod (11) whose top end extends to the top of the sealing sleeve (10), and an elastic member (12) is provided on the outer surface of the fixing rod (11), and the first sleeve (4) is elastically connected to the sealing sleeve (10) through the fixing rod (11) and the elastic member (12).

3. The three-axis mixing pile driver for SWM method pile construction according to claim 2, characterized in that: An angle sensor is provided between the driving device (2) and the second sleeve (7) and is used to monitor the rotational displacement difference between the driving device (2) and the transmission shaft of the second sleeve (7) in real time. When a rotational displacement difference is generated between the driving device (2) and the second sleeve (7) due to the impact of the spiral drill rod (3), the rotational displacement difference between them is eliminated by regulating the rotation speed of the second sleeve (7), and the magnetic blocking plate (6) on the first sleeve (4) and the permanent magnet (8) on the second sleeve (7) are again in a mutually staggered state.

4. The three-axis mixing pile driver for SWM method pile construction according to claim 1, characterized in that: The interior of the auger structure (5) is provided with a plurality of groups of through holes arranged in a circular array and extending vertically therethrough.

5. The three-axis mixing pile driver for SWM method pile construction according to claim 2, characterized in that: A certain gap remains between the top of the auger structure (5) and the top of the inner cavity of the first sleeve (4).

6. The three-axis mixing pile driver for SWM method pile construction according to claim 1, characterized in that: The interior of the auger rod (3) is provided with a flow hole whose top end extends to the top thereof, and the bottom end of the flow hole is divided into two and extends to both sides of the bottom of the outer surface of the auger rod (3). At the same time, the flow holes on the auger rod (3) at the two side positions are connected to the high-pressure cement pump, and the flow hole on the auger rod (3) at the middle position is connected to the high-pressure air pump.

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