Drill rod for mixing pile

Abstract

The present invention relates to the technical field of cement mixing pile drill rods, and specifically discloses a drill rod for a mixing pile, comprising a first drill rod, a second drill rod and a support rod, wherein the first drill rod, the second drill rod and the support rod are coaxially arranged, the second drill rod penetrates and is rotatably sleeved in the first drill rod, the top ends of the first drill rod and the second drill rod are respectively connected to matching drive devices, the support rod is rotatably installed in the second drill rod, and a stirring structure is arranged between the first drill rod and the second drill rod. The present invention has an extrusion stirring structure, which improves the stirring effect, an automatic wall scraping structure, and a function of discharging air in the second drill rod, thereby ensuring uniform grouting, preventing cement from adhering and solidifying in the second drill rod, facilitating cleaning, improving the power of cement flow in the middle of the drill rod, improving the uniformity of cement outflow, and reducing the possibility of cement at the bottom of the drill rod being blocked due to insufficient power.

Description

Technical Field

[0001] The invention relates to the technical field of cement mixing pile drill rods, and in particular to a drill rod for a mixing pile. Background Art

[0002] Cement-soil mixing piles are a construction device used to reinforce saturated soft clay foundations. They use cement as a curing agent and forcefully mix the soft soil and curing agent deep in the foundation through a special mixing machine. At the same time, a series of physical and chemical reactions between the curing agent and the soft soil are used to harden the soft soil into a high-quality foundation with integrity, water stability and a certain strength. The drill pipe is a steel pipe with a threaded tail, which is used to connect cement-soil mixing piles. Its main uses include transporting cement slurry to the drill bit and raising, lowering or rotating the bottom hole device together with the drill bit. In addition, the drill pipe must be designed to withstand huge tensile forces and torques to ensure safety and efficiency during the drilling process.

[0003] At present, the drill rods corresponding to cement mixing piles on the market are not efficient enough in use because they are generally used for unidirectional mixing, that is, one drill rod drives a drill bit for unidirectional mixing construction. After the cement flows to the bottom of the drill rod, the kinetic energy decreases, resulting in insufficient cement discharge pressure, and the air in the drill rod is not easy to be discharged, resulting in uneven grouting, insufficient cement fluidity, and inconvenient cleaning of the drill rod. Summary of the invention

[0004] In order to solve the above problems existing in the prior art, the present invention provides a drill rod for a mixing pile, which can overcome the technical defects.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A drill rod for a mixing pile, comprising a first drill rod, a second drill rod and a support rod, wherein the first drill rod, the second drill rod and the support rod are coaxially arranged, the second drill rod penetrates and is rotatably sleeved in the first drill rod, the top ends of the first drill rod and the second drill rod are respectively connected to matching driving devices, the support rod is rotatably installed in the second drill rod, a mixing structure is arranged between the first drill rod and the second drill rod, the second drill rod is arranged in two disconnected sections, a support assembly for rotatably supporting the two sections of the second drill rod is arranged in the first drill rod, and two sets of scraper assemblies are arranged on the side walls of the support rod, and the scraper assemblies are used to clean cement on the inner wall of the second drill rod;

[0007] The support assembly includes a support ring, two support rings are fixedly installed on the inner wall of the first drill rod, an expansion tube is rotatably installed between the two support rings, an expansion chamber is provided in the middle of the expansion tube, support tubes are fixedly sleeved at both ends of the expansion tube, the two support tubes are respectively threadedly connected to the two sections of the second drill rod, and a driving assembly for driving the support rod to rotate is provided between the support tube and the first drill rod;

[0008] The driving assembly includes an annular tube, which is rotatably installed in the expansion chamber of the expansion tube. The support rod is fixedly sleeved with an annular sleeve. Three connecting rods are arranged between the annular sleeve and the annular tube. The radial cross-section of the connecting rod is an inverted teardrop-shaped arrangement. The connecting rod cooperates with the expansion chamber of the expansion tube to press down the cement. The outer wall of the annular tube is provided with a plurality of assembly grooves, and a suction plate is arranged in the assembly groove. A plurality of electromagnets are arranged between the two support rings, and the number of the electromagnets and the suction plates is the same, and the electromagnets match the suction plates.

[0009] Preferably, the first drill rod is open at the top and closed at the bottom, a sealing plate is provided at the opening at the top of the first drill rod, two limiting rings are fixedly sleeved on the outer wall of the second drill rod, the two limiting rings are respectively fitted with the sealing plate and the bottom wall of the first drill rod, and a drill bit is provided at the bottom end of the second drill rod.

[0010] Preferably, the stirring structure comprises a first stirring blade and a second stirring blade, the outer wall of the first drill rod is provided with a plurality of first stirring blades, and the outer wall of the second drill rod is provided with a plurality of second stirring blades.

[0011] Preferably, the first stirring blade and the second stirring blade both rotate radially around the support rod, and the first stirring blade and the second stirring blade rotate in opposite directions and at the same angle.

[0012] Preferably, the first stirring blade is hollow inside and communicated with the interior of the first drill rod, the second stirring blade is hollow inside and communicated with the interior of the second drill rod, and a plurality of through holes for cement to pass through are respectively provided on the surfaces of the first stirring blade and the second stirring blade.

[0013] Preferably, the expansion sleeve is provided with two retaining rings, and the retaining rings are respectively located on the side away from the two supporting rings.

[0014] Preferably, the wall scraper assembly includes a support bar, which is fixedly mounted on the side wall of the support rod. The side wall of the support bar is provided with a plurality of cross bars, and an assembly frame is commonly fixedly mounted at one end of the plurality of cross bars away from the support rod, and the assembly frame is clamped with the wall scraper bar.

[0015] Preferably, the scraper strip is slidably engaged with the assembly frame, and the side wall of the assembly frame is provided with screws for fixing the scraper strip.

[0016] The beneficial effects of the present invention are:

[0017] 1. By setting a stirring structure, the first stirring blade and the second stirring blade both rotate radially around the support rod, the first stirring blade and the second stirring blade rotate in opposite directions and have the same rotation angle, the first stirring blade is hollow inside and communicated with the inside of the first drill rod, the second stirring blade is hollow inside and communicated with the inside of the second drill rod, a plurality of through holes for cement to pass through are respectively provided on the surfaces of the first stirring blade and the second stirring blade, the second drill rod is provided in two disconnected sections, the top ends of the first drill rod and the second drill rod are respectively connected to matching driving devices, the two driving devices drive the first drill rod and the second drill rod to rotate around the support rod in opposite directions, the first stirring blade stirs the soil and cement upward, and the second stirring blade stirs the soil and cement downward, forming an extrusion stirring structure, thereby improving the stirring effect.

[0018] 2. By setting up the scraper assembly, under the action of the external driving device, the second drill rod, the support tube, the expansion tube and the retaining ring rotate synchronously, the support ring, the electromagnet and the first drill rod rotate synchronously. After the electromagnet is energized, it cooperates with the suction plate to drive the ring tube, the ring sleeve, the connecting rod and the support rod to rotate synchronously, and the support bar, the cross bar, the assembly frame and the scraper bar rotate coaxially. While the cross bar and the assembly frame stir the cement in the second drill rod, the scraper bar cleans the cement on the inner wall of the second drill rod. It has an automatic scraper structure and has the function of discharging the air in the second drill rod, thereby ensuring uniform grouting and preventing cement from adhering and solidifying in the second drill rod, which is convenient for cleaning.

[0019] 3. By setting a driving component, when cement flows through the expansion tube between the second drill rods at both ends, due to the influence of fluid viscosity, the velocity and kinetic energy gradient of cement near the wall are large, while the pressure gradually increases, and the flow rate of cement decreases. During the rotation of multiple connecting rods, since the radial cross-section of the connecting rod is an inverted teardrop shape, the connecting rod squeezes the cement downward, thereby improving the power of cement flow in the middle of the drill rod, improving the uniformity of cement outflow, and reducing the possibility of cement at the bottom of the drill rod being blocked due to insufficient power. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a cross-sectional view in the present invention;

[0023] Figure 3 FIG. 4 is a diagram showing the installation structure of the second stirring blade in the present invention;

[0024] Figure 4This is a diagram of the installation structure of the support assembly in the present invention;

[0025] Figure 5 This is a structural diagram of the installation of the annular tube in the present invention;

[0026] Figure 6 This is a diagram of the installation structure of the support ring and the electromagnet in the present invention;

[0027] Figure 7 is a cross-sectional view of the annular tube in the present invention;

[0028] Figure 8 This is a diagram of the installation structure of the wall scraping assembly in the present invention;

[0029] Fig. 9 It is the installation structure diagram of the assembly frame and the scraper strip in the present invention.

[0030] Description of reference numerals:

[0031] In the figure: 1. first drill rod; 11. first stirring blade; 12. sealing plate; 13. support ring; 14. electromagnet; 2. second drill rod; 21. second stirring blade; 22. limit ring; 23. expansion tube; 24. retaining ring; 25. support tube; 26. drill bit; 3. support rod; 31. ring tube; 32. ring sleeve; 33. connecting rod; 34. assembly groove; 35. suction plate; 36. support bar; 37. cross bar; 38. assembly frame; 39. scraper bar. DETAILED DESCRIPTION

[0032] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are clearly and completely described below in combination with the accompanying drawings and preferred embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the description of the present application, it should be understood that the orientation or position relationship indicated by "inside", "outside", etc. is based on the orientation or position described in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, a specific orientation structure and operation, and therefore cannot be understood as a limitation on the present application.

[0034] Reference Figure 1-Figure 9, is a drill rod for mixing piles disclosed in the present invention, comprising a first drill rod 1, a second drill rod 2 and a support rod 3, the first drill rod 1, the second drill rod 2 and the support rod 3 are coaxially arranged, the second drill rod 2 penetrates and is rotatably sleeved in the first drill rod 1, the top ends of the first drill rod 1 and the second drill rod 2 are respectively connected to matching driving devices, the top of the first drill rod 1 is open and the bottom is closed, a sealing plate 12 is arranged at the open mouth at the top of the first drill rod 1, two limiting rings 22 are fixedly sleeved on the outer wall of the second drill rod 2, the two limiting rings 22 are respectively fitted with the sealing plate 12 and the bottom wall of the first drill rod 1, the support rod 3 is rotatably installed in the second drill rod 2, a drill bit 26 is arranged at the bottom end of the second drill rod 2, a stirring structure is arranged between the first drill rod 1 and the second drill rod 2, the stirring structure comprises a first stirring blade 11 and a second stirring blade 21, a plurality of first stirring blades 11 are arranged on the outer wall of the first drill rod 1, and a plurality of first stirring blades 11 are arranged on the outer wall of the second drill rod 1. The outer wall of the rod 2 is provided with a plurality of second stirring blades 21, the first stirring blades 11 and the second stirring blades 21 both rotate radially around the support rod 3, the first stirring blades 11 and the second stirring blades 21 rotate in opposite directions and have the same rotation angle, the first stirring blade 11 is hollow inside and communicates with the interior of the first drill rod 1, the second stirring blade 21 is hollow inside and communicates with the interior of the second drill rod 2, a plurality of through holes for cement to pass through are respectively provided on the surfaces of the first stirring blades 11 and the second stirring blades 21, the second drill rod 2 is provided in two disconnected sections, the top ends of the first drill rod 1 and the second drill rod 2 are respectively connected to matching driving devices, the two driving devices drive the first drill rod 1 and the second drill rod 2 to rotate around the support rod 3 in opposite directions, the first stirring blade 11 stirs the soil and cement upward, the second stirring blade 21 stirs the soil and cement downward, forming an extrusion stirring structure, thereby improving the stirring effect.

[0035] A support assembly for rotatably supporting two sections of the second drill rod 2 is provided in the first drill rod 1, and the support assembly includes a support ring 13. Two support rings 13 are fixedly installed on the inner wall of the first drill rod 1, and an expansion tube 23 is rotatably installed between the two support rings 13. An expansion chamber is provided in the middle of the expansion tube 23, and the expansion tube 23 is sleeved with two retaining rings 24. The retaining rings 24 are respectively located on the side away from the two support rings 13. Support tubes 25 are fixedly sleeved at both ends of the expansion tube 23. The two support tubes 25 are respectively threadedly connected to the two sections of the second drill rod 2, and the second drill rods 2 at both ends are respectively threadedly connected to the adjacent support tubes 25. Under the action of the external driving device, the second drill rod 2, the support tube 25, the expansion tube 23 and the retaining ring 24 rotate synchronously.

[0036] A driving assembly for driving the support rod 3 to rotate is arranged between the support tube 25 and the first drill rod 1, and the driving assembly includes an annular tube 31, and the annular tube 31 is rotatably mounted in the expansion chamber of the expansion tube 23. The support rod 3 is fixedly sleeved with an annular sleeve 32, and three connecting rods 33 are arranged between the annular sleeve 32 and the annular tube 31. The radial cross section of the connecting rod 33 is an inverted water drop shape. The connecting rod 33 cooperates with the expansion chamber of the expansion tube 23 to press cement downward, and a plurality of assembly grooves 34 are arranged on the outer wall of the annular tube 31, and a suction plate 35 is arranged in the assembly groove 34. A plurality of electromagnets 14 are arranged between the two support rings 13, and the electromagnets 14 The number of the suction plates 35 is the same, the electromagnet 14 matches the suction plate 35, the side wall of the support rod 3 is provided with two sets of scraper assemblies, the scraper assemblies are used to clean the cement on the inner wall of the second drill rod 2, the scraper assemblies include support bars 36, the support bars 36 are fixedly installed on the side wall of the support rod 3, the side wall of the support bar 36 is provided with a plurality of cross bars 37, the end of the plurality of cross bars 37 away from the support rod 3 is fixedly installed with an assembly frame 38, the assembly frame 38 is clamped with a scraper bar 39, the scraper bar 39 is slidably clamped with the assembly frame 38, and the side wall of the assembly frame 38 is provided with screws for fixing the scraper bar 39 The assembly frame 38 cooperates with the screws to have a detachable structure for the scraper strip 39. Under the action of the external driving device, the second drill rod 2, the support tube 25, the expansion tube 23 and the retaining ring 24 rotate synchronously, and the support ring 13, the electromagnet 14 and the first drill rod 1 rotate synchronously. After the electromagnet 14 is energized, it cooperates with the suction plate 35 to drive the ring tube 31, the ring sleeve 32, the connecting rod 33 and the support rod 3 to rotate synchronously. When the cement flows through the expansion tube 23 between the second drill rods 2 at both ends, due to the influence of the viscosity of the fluid, the velocity and kinetic energy gradient of the cement near the wall are relatively large, and the pressure gradually increases, and the flow rate of the cement decreases. During the rotation of the multiple connecting rods 33, since the radial cross-section of the connecting rods 33 is in an inverted teardrop shape, the connecting rods 33 squeeze the cement downward, thereby increasing the power of cement flow in the middle of the drill rod and improving the uniformity of cement outflow. The support bar 36, the cross bar 37, the assembly frame 38 and the scraper bar 39 rotate coaxially. While the cross bar 37 and the assembly frame 38 stir the cement in the second drill rod 2, the scraper bar 39 cleans the cement on the inner wall of the second drill rod 2, which has the function of expelling air in the second drill rod 2, ensuring uniform grouting, and preventing cement from adhering and solidifying in the second drill rod 2, which is convenient for cleaning.

[0037] The working principle and use process of the present invention are as follows: the second drill rods 2 at both ends are respectively threadedly connected to the adjacent support tubes 25. Under the action of the external driving device, the two driving devices drive the first drill rod 1 and the second drill rod 2 to rotate around the support rod 3 in opposite directions respectively. The second drill rod 2, the support tube 25, the expansion tube 23 and the retaining ring 24 rotate synchronously. The first stirring blade 11 stirs the soil and cement upward, and the second stirring blade 21 stirs the soil and cement downward to form an extrusion stirring structure, which improves the stirring effect. The support ring 13, the electromagnet 14 and the first drill rod 1 rotate synchronously. After the electromagnet 14 is energized, it cooperates with the suction plate 35 to drive the ring tube 31, the ring sleeve 32, the connecting rod 33 and the support rod 3 to rotate synchronously, and the cement flows through the space between the second drill rods 2 at both ends. When in the expansion tube 23, due to the influence of fluid viscosity, the velocity and kinetic energy gradient of the cement near the wall are large, while the pressure gradually increases and the flow rate of the cement decreases. During the rotation of the multiple connecting rods 33, since the radial cross-section of the connecting rods 33 is in an inverted teardrop shape, the connecting rods 33 squeeze the cement downward, thereby increasing the power of the cement flow in the middle of the drill rod and improving the uniformity of the cement outflow. The support bar 36, the cross bar 37, the assembly frame 38 and the scraper bar 39 rotate coaxially. While the cross bar 37 and the assembly frame 38 stir the cement in the second drill rod 2, the scraper bar 39 cleans the cement on the inner wall of the second drill rod 2, which has the function of discharging the air in the second drill rod 2, ensuring uniform grouting, and preventing the cement from adhering and solidifying in the second drill rod 2, which is convenient for cleaning.

[0038] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A drill rod for a mixing pile, comprising a first drill rod (1), a second drill rod (2) and a support rod (3), characterized in that: The first drill rod (1), the second drill rod (2) and the support rod (3) are coaxially arranged; the second drill rod (2) penetrates through and is rotatably sleeved in the first drill rod (1); the top ends of the first drill rod (1) and the second drill rod (2) are respectively connected to matching driving devices; the support rod (3) is rotatably installed in the second drill rod (2); a stirring structure is arranged between the first drill rod (1) and the second drill rod (2); the second drill rod (2) is arranged in two disconnected sections; a support assembly for rotatably supporting the two sections of the second drill rod (2) is arranged in the first drill rod (1); two sets of scraper assemblies are arranged on the side walls of the support rod (3); the scraper assemblies are used to clean cement on the inner wall of the second drill rod (2); The support assembly comprises a support ring (13), two support rings (13) are fixedly mounted on the inner wall of the first drill rod (1), an expansion tube (23) is rotatably mounted between the two support rings (13), an expansion chamber is provided in the middle of the expansion tube (23), support tubes (25) are fixedly sleeved at both ends of the expansion tube (23), the two support tubes (25) are respectively threadedly connected to the two sections of the second drill rod (2), and a driving assembly for driving the support rod (3) to rotate is provided between the support tube (25) and the first drill rod (1); The driving assembly comprises an annular tube (31), the annular tube (31) being rotatably mounted in the expansion chamber of the expansion tube (23); the support rod (3) being fixedly sleeved with an annular sleeve (32); three connecting rods (33) being arranged between the annular sleeve (32) and the annular tube (31); the radial cross-section of the connecting rods (33) being arranged in an inverted teardrop shape; the connecting rods (33) being arranged in cooperation with the expansion chamber of the expansion tube (23) for pressing cement downward; the outer wall of the annular tube (31) being provided with a plurality of assembly grooves (34); a suction plate (35) being arranged in the assembly grooves (34); and a plurality of electromagnets (14) being arranged between the two support rings (13); the number of the electromagnets (14) and the suction plates (35) being the same, and the electromagnets (14) and the suction plates (35) being matched.

2. A drilling rod for a mixing pile according to claim 1, characterized in that: The first drill rod (1) is open at the top and closed at the bottom; a sealing plate (12) is provided at the open top of the first drill rod (1); two limiting rings (22) are fixedly sleeved on the outer wall of the second drill rod (2); the two limiting rings (22) are respectively fitted with the sealing plate (12) and the bottom wall of the first drill rod (1); and a drill bit (26) is provided at the bottom end of the second drill rod (2).

3. The drill rod for a mixing pile according to claim 1, characterized in that: The stirring structure comprises a first stirring blade (11) and a second stirring blade (21); the outer wall of the first drill rod (1) is provided with a plurality of first stirring blades (11); and the outer wall of the second drill rod (2) is provided with a plurality of second stirring blades (21).

4. A drilling rod for a mixing pile according to claim 3, characterized in that: The first stirring blade (11) and the second stirring blade (21) both rotate radially around the support rod (3); the first stirring blade (11) and the second stirring blade (21) rotate in opposite directions and at the same angle.

5. The drill rod for a mixing pile according to claim 3, characterized in that: The first stirring blade (11) is hollow inside and communicates with the interior of the first drill rod (1), the second stirring blade (21) is hollow inside and communicates with the interior of the second drill rod (2), and a plurality of through holes for cement to pass through are respectively provided on the surface of the first stirring blade (11) and the second stirring blade (21).

6. The drill rod for a mixing pile according to claim 1, characterized in that: The expansion tube (23) is sleeved with two retaining rings (24), and the retaining rings (24) are respectively located on the sides away from the two support rings (13).

7. The drill rod for a mixing pile according to claim 1, characterized in that: The wall scraping assembly comprises a support bar (36), the support bar (36) being fixedly mounted on a side wall of a support rod (3), the side wall of the support bar (36) being provided with a plurality of cross bars (37), an assembly frame (38) being fixedly mounted together at one end of the plurality of cross bars (37) away from the support rod (3), and the assembly frame (38) being clamped with a wall scraping bar (39).

8. The drill rod for a mixing pile according to claim 7, characterized in that: The scraper strip (39) is slidably engaged with the assembly frame (38), and a screw for fixing the scraper strip (39) is provided on a side wall of the assembly frame (38).

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