A type of jet grouting pile device

Abstract

This utility model relates to the field of engineering machinery and equipment technology, and provides a jet grouting pile device, which solves the technical problem that traditional large-diameter pile construction often requires large-tonnage, high-torque jet grouting machines, resulting in high energy consumption. The jet grouting pile device includes a drilling tool, which includes a drill bit assembly and at least one set of agitator blade units fixed to the outer periphery of the drill bit assembly and distributed in a ring-shaped interval. The drilling tool is a rotary jet grouting drill, and the drill bit assembly is provided with lateral nozzles; the agitator blade units include agitator blades and breaking teeth distributed on the agitator blades, and the injection channel of the nozzle is not higher than the breaking teeth.

Description

Technical Field

[0001] This utility model relates to the field of engineering machinery and equipment technology, specifically to a jet grouting pile device. Background Technology

[0002] Cement-soil mixing piles, as the main load-bearing structure of grid-type gravity retaining walls in soft soil areas, are a type of pile that uses cement as the main solidifying agent. The cement is injected into the soil using a mixing pile machine and thoroughly mixed, causing a series of physical and chemical reactions between the cement and the soil, which hardens the soft soil into piles.

[0003] Traditional large-diameter pile construction often requires the use of large-tonnage, high-torque mixing pile machines, which consumes a lot of energy. How to enable small-tonnage pile machines to be competent for large-diameter pile construction has always been a technical problem that needs to be solved in this field. Utility Model Content

[0004] In view of the shortcomings of the prior art, this utility model provides a jet grouting device to solve the above-mentioned problems existing in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A jet grouting device includes a drilling tool, the drilling tool comprising a drill bit assembly and at least one set of agitator blade units fixed to the outer periphery of the drill bit assembly and arranged in a ring-shaped interval, characterized in that:

[0007] The drilling tool is a rotary jet drilling tool, and the drill bit assembly is equipped with lateral nozzles;

[0008] The stirring blade unit includes stirring blades and breaking teeth distributed on the stirring blades, and the injection channel of the nozzle is not higher than the breaking teeth.

[0009] Furthermore, at least one of the stirring blade units has a nozzle below the stirring blade, and a downwardly extending baffle is installed at the front end of the stirring blade. The spray channel of the nozzle extends along the length of the stirring blade and the height of the spray channel falls within the vertical height range of the baffle.

[0010] Furthermore, the stirring blade unit includes a stirring blade, main crushing teeth, a toothed plate, and a baffle. The stirring blade is fixedly connected to the side wall of the drill bit assembly and extends outward along the radial direction of the drill bit assembly. A plurality of the main crushing teeth are fixed to one side wall of the stirring blade and spaced apart. The toothed plate is fixed to the other side wall of the stirring blade. The baffle is fixed to the end of the stirring blade. Both the toothed plate and the baffle extend downward relative to the stirring blade. The lower edge of the toothed plate is provided with a first secondary crushing tooth distributed along the length direction. The lower edge of the baffle is provided with a second secondary crushing tooth distributed along the length direction. The crushing teeth are mainly composed of the main crushing teeth, the first secondary crushing teeth, and the second secondary crushing teeth.

[0011] Furthermore, the first crushing auxiliary teeth along the lower edge of the toothed plate are inclinedly distributed, and the height of each first crushing auxiliary tooth increases radially from the inside to the outside.

[0012] Furthermore, the second crushing auxiliary teeth along the lower edge of the baffle are inclinedly distributed, and the height of each second crushing auxiliary tooth increases sequentially from front to back along the stirring direction.

[0013] Furthermore, the main body of the crushing tooth is in the shape of a four-sided pyramid with its tip facing outward. The upper surface of the stirring blade has a first inclined surface and a second inclined surface. The upper inclined surface of the crushing tooth and the first and second inclined surfaces of the stirring blade are connected in sequence. The first inclined surface and the upper inclined surface are parallel. The inclination angle of the second inclined surface is smaller than that of the first inclined surface.

[0014] Furthermore, the drill bit assembly includes an outer tube, with a drill bit fixedly connected to its lower end. An inner tube assembly, coaxial with the drill bit, is located inside the drill bit. An annular gap between the inner tube assembly and the outer tube serves as a gas channel. The cavity of the inner tube assembly serves as a solidified slurry channel. An opening is provided on the outer tube, and a mounting base is installed within the opening. The nozzle passes through the mounting base and is installed on the inner tube assembly. The nozzle's spray channel serves as a solidified slurry outlet and communicates with the solidified slurry channel. The annular gap between the nozzle and the mounting base serves as a gas outlet and communicates with the gas channel.

[0015] Furthermore, the inner tube assembly includes an inner upper tube and an inner lower tube that are coaxially inserted from top to bottom. The upper end of the inner upper tube is limited by an upper limit stop provided on the inner sidewall of the outer tube. The lower end of the inner lower tube is closed and supported on a support shaft. The support shaft is supported by a lower support provided on the inner sidewall of the outer tube or the inner sidewall of the drill bit. The nozzle passes through the mounting seat and is installed on the inner lower tube and communicates with the cavity of the inner lower tube.

[0016] Preferably, the inner wall of the outer tube is provided with a first flange extending radially inward, and the first flange is provided with a plurality of first side channels extending from top to bottom. The portion of the inner upper tube above the first flange is provided with a second flange extending radially outward, and the second flange is attached to the inner side wall of the outer tube and is provided with a plurality of second side channels extending from top to bottom.

[0017] The annular gap between the inner tube and the outer tube, the second side channel, and the annular gap between the upper inner tube, the lower inner tube, and the first flange are connected in sequence to form a gas channel.

[0018] The cavities of the inner tube, the upper inner tube, and the lower inner tube are connected in sequence to form a solidified slurry channel.

[0019] Preferably, the lower part of the support shaft is provided with a third flange extending radially outward, and the third flange is provided with a plurality of third side channels running from top to bottom. The inner sidewall of the drill bit is provided with a through hole running radially outward, and the through hole is sealed with a plug.

[0020] The upper limit component is a retaining ring, which is installed in the retaining ring mounting groove on the inner side wall of the outer tube;

[0021] The lower support is a step, which is located on the inner sidewall of the drill bit.

[0022] This utility model provides a jet grouting pile device with the following beneficial effects: the solidified grout is sprayed out at high speed through the nozzle of the jet grouting drill, which breaks up and liquefies the soil, reduces the working resistance of the mixing blade unit, reduces the torque requirement, and enables small-tonnage pile drivers to undertake the construction of large-diameter piles, while reducing energy consumption. Attached Figure Description

[0023] Figure 1 This is a first-view structural schematic diagram of the present invention;

[0024] Figure 2 This is a structural schematic diagram of the present invention from a second perspective;

[0025] Figure 3 This is a structural schematic diagram of the present invention from a third-view perspective;

[0026] Figure 4 This is a schematic diagram of the structure of this utility model from a third-view perspective, omitting the baffle.

[0027] Figure 5 This is a cross-sectional view of the present invention from a fourth perspective;

[0028] Figure 6 for Figure 5 A magnified structural diagram of point A in the middle;

[0029] Figure 7 This is a cross-sectional view of the present invention from a fifth perspective;

[0030] Figure 8 for Figure 7 A magnified structural diagram of section B in the middle.

[0031] In the picture:

[0032] 1. Outer tube;

[0033] 1a. First flange;

[0034] 1a-1, First side passage;

[0035] 2a. Second flange;

[0036] 2a-1, Second side passage;

[0037] 3. Inner lower connecting pipe;

[0038] 4. Nozzle;

[0039] 4a. Injection channel;

[0040] 5. Support shaft;

[0041] 5a. Third flange;

[0042] 5a-1, Third Side Passage;

[0043] 6. Drill bit;

[0044] 6a. Steps;

[0045] 7. Plug;

[0046] 8. Agitator blades;

[0047] 8a. First inclined plane;

[0048] 8b. The second inclined plane;

[0049] 9. Toothed plate;

[0050] 9a. First crushing auxiliary tooth;

[0051] 10. Baffle;

[0052] 10a. Second crushing auxiliary tooth;

[0053] 11. Broken main teeth;

[0054] 11a, upper slope;

[0055] 12. Snap ring;

[0056] 13. Mounting bracket. Detailed Implementation

[0057] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0058] See attached document Figure 1-8A jet grouting pile device includes a drilling tool, the drilling tool including a drill bit assembly and at least one set of agitator blade units fixed to the outer wall of the drill bit assembly and distributed in a ring-shaped interval, the drilling tool being a rotary jet grouting tool, and the drill bit assembly having a lateral nozzle 4;

[0059] Among them, the rotary jet drilling tool is an existing technology. The liquid channel, pressure generating device (specifically high pressure generating device) and solidified slurry storage tank of the rotary jet drilling tool are connected in sequence. The solidified slurry is pressurized by the pressure generating device and then sprayed out at high speed through the nozzle 4 of the drill bit assembly to break up and liquefy the soil (from solidified soil state to mud state, with enhanced fluidity).

[0060] The stirring blade unit includes stirring blades 8 and breaking teeth distributed on the stirring blades 8. The injection channel 4a of the nozzle 4 is not higher than the breaking teeth. The solidified slurry jet can also scour the stirring blade unit, making the drill bit 6 less prone to clogging and effectively improving drilling efficiency.

[0061] In this embodiment, the stirring blade unit includes an upper pair of stirring blade units and a lower pair of stirring blade units. A nozzle 4 is disposed below the stirring blades 8 of the lower pair of stirring blade units. A downwardly extending baffle 10 is installed at the front end of each stirring blade 8. (Refer to the attached diagram.) Figure 3 , 4 The nozzle 4 has a spray channel 4a extending along the length of the mixing blade 8, and the height of the spray channel 4a falls within the vertical height range of the baffle 10. On one hand, the solidified slurry jet ejected from the nozzle 4 is blocked by the baffle 10, reducing the overflow of the solidified blade into the pile diameter and ensuring it acts fully within the effective pile diameter, resulting in thorough mixing of the cement slurry within the pile diameter. On the other hand, as the baffle 10 rotates synchronously with the drilling tool, it has a certain smoothing effect on the sidewall of the pile hole, making the sidewall more compact and further reducing the overflow of the solidified blade into the pile diameter. Simultaneously, due to the obstruction of the baffle 10, the high-speed, high-pressure solidified blade jet can be prevented from damaging the smoothed sidewall; this optimizes the pile hole... The sidewalls are flat and dense, and also block the jet of the solidified slurry. Therefore, the included angle between the baffle 10 and the spray channel 4a of the nozzle 4 is controlled at 95°-100°. This not only blocks the jet of the solidified slurry, but also allows the solidified slurry, after being slowed down and depressurized, to flow towards the front side of the baffle 10, thus wetting the soil in front of the direction of rotation of the baffle 10. This makes the soil softer and more plastic, and when it is compacted onto the hole wall, a smoother, denser, and continuous isolation and sealing layer can be obtained, which can better block the microchannels and reduce the leakage of the solidified slurry.

[0062] Specifically, the stirring blade unit includes a stirring blade 8, main crushing teeth 11, a toothed plate 9, and a baffle 10. The stirring blade 8 is fixedly connected to the side wall of the drill bit assembly (specifically, the side wall of the outer tube 1) and extends outward along the radial direction of the outer tube 1. Several main crushing teeth 11 are fixed to one side wall of the stirring blade 8 and spaced apart. The toothed plate 9 is fixed to the other side wall of the stirring blade 8. The baffle 10 is fixed to the end of the stirring blade 8. Both the toothed plate 9 and the baffle 10 extend downward relative to the stirring blade 8. The lower edge of the toothed plate 9 is provided with a first secondary crushing tooth 9a distributed along the length direction. The lower edge of the baffle 10 is provided with a second secondary crushing tooth 10a distributed along the length direction. The crushing teeth are mainly composed of the main crushing teeth 11, the first secondary crushing tooth 9a, and the second secondary crushing tooth 10a. Among them, the main crushing tooth 11 not only crushes the soil, but also crushes and pushes away gravel and stones in the soil, reducing the obstruction of gravel and stones to the solidified slurry jet; in addition to crushing, the first secondary crushing tooth 9a, when the solidified slurry jet is combined with the main crushing tooth 11 to crush the soil, will result in a relatively large proportion of the solidified slurry being discharged from the orifice along with the mud before it has a chance to effectively mix with the soil, resulting in low utilization of the solidified slurry. The first secondary crushing tooth 9a, together with the tooth plate 9, fully mixes the solidified slurry and soil, improving the utilization rate of the solidified slurry; the second crushing tooth mainly reduces the entry resistance of the baffle 10.

[0063] The first crushing teeth 9a along the lower edge of the toothed plate 9 are inclined, and the height of each first crushing tooth 9a increases radially from the inside to the outside. The second crushing teeth 10a along the lower edge of the baffle 10 are also inclined, and the height of each second crushing tooth 10a increases radially from front to back along the stirring direction. The inclined distribution of both the first crushing teeth 9a and the second crushing teeth 10a serves to reduce resistance.

[0064] In this embodiment, the main body of the crushing tooth 11 is a square pyramid with its tip facing outward. The upper surface of the stirring blade 8 has a first inclined surface 8a and a second inclined surface 8b. The upper inclined surface 11a of the crushing tooth 11 and the first inclined surface 8a and the second inclined surface 8b of the stirring blade 8 are connected in sequence. The first inclined surface 8a and the upper inclined surface 11a are parallel and serve as a connection. The inclination angle of the second inclined surface 8b is smaller than that of the first inclined surface 8a, and the second inclined surface 8b serves as a self-tapping surface.

[0065] In this embodiment, an outer tube 1 is included, with a drill bit 6 fixedly connected to its lower end. A coaxial inner tube assembly is provided inside the drill bit 6. The annular gap between the inner tube assembly and the outer tube 1 serves as a gas channel. The cavity of the inner tube assembly serves as a solidified slurry channel. An opening is provided on the outer tube 1, and a mounting base 13 is installed within the opening. A nozzle 4 passes through the mounting base 13 and is installed on the inner tube assembly. The injection channel 4a of the nozzle 4 serves as a solidified slurry outlet and communicates with the solidified slurry channel. The annular gap between the nozzle 4 and the mounting base 13 serves as a gas outlet and communicates with the gas channel. The overall structure of the rotary jet grouting drill is not shown in the figures; it is prior art. The rotary jet grouting drill consists of a shaft assembly, a drill rod assembly, and the connection between the two assemblies. For details, please refer to the applicant's prior patent CN111287660A.

[0066] Specifically, the inner tube assembly includes an upper inner tube and a lower inner tube 3 coaxially connected from top to bottom. The upper end of the upper inner tube is limited by an upper limit stop provided on the inner sidewall of the outer tube 1. The lower end of the lower inner tube 3 is closed and supported on a support shaft 5. The support shaft 5 is supported by a lower support provided on the inner sidewall of the drill bit 6. The nozzle 4 passes through the mounting base 13 and is installed on the lower inner tube 3, communicating with the cavity of the lower inner tube 3. The upper limit stop is a retaining spring 12, which is installed in a retaining spring 12 mounting groove on the inner sidewall of the outer tube 1. The lower support is a step 6a, which is provided on the inner sidewall of the drill bit 6.

[0067] The outer tube 1 has a first flange 1a extending radially inward on its inner wall. The first flange 1a has several first side channels extending from top to bottom. The inner upper tube has a second flange 2a extending radially outward at the part above the first flange 1a. The second flange 2a is attached to the inner wall of the outer tube 1 and has several second side channels extending from top to bottom.

[0068] The annular gap between the inner tube and the outer tube 1, the second side channel, and the annular gap between the inner upper tube, the inner lower tube 3 and the first flange 1a are connected in sequence to form a gas channel.

[0069] The cavities of the inner tube, the upper inner tube, and the lower inner tube 3 are connected in sequence to form a solidified slurry channel.

[0070] The lower part of the support shaft 5 is provided with a third flange 5a extending radially outward. The third flange 5a is provided with several third side channels that run from top to bottom. The inner side wall of the drill bit 6 is provided with a through hole that runs radially outward. The through hole is sealed by a plug 7 and is used as a reserved spare channel.

[0071] It should be noted that, in this document, relational terms such as "first" and "second" are used only 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.

[0072] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A jet grouting device, comprising a drilling tool, the drilling tool including a drill bit assembly and at least one set of agitator blade units fixed to the outer periphery of the drill bit assembly and distributed in a ring-shaped interval, characterized in that: The drilling tool is a rotary jet drilling tool, and the drill bit assembly of the drilling tool is provided with a lateral nozzle; The stirring blade unit includes stirring blades and breaking teeth distributed on the stirring blades, and the injection channel of the nozzle is not higher than the breaking teeth.

2. A jetting pile apparatus as claimed in claim 1, wherein: At least one of the stirring blade units has a nozzle below the stirring blade, and a downwardly extending baffle is installed at the front end of the stirring blade. The spray channel of the nozzle extends along the length of the stirring blade and the height of the spray channel falls within the vertical height range of the baffle.

3. A jetting pile apparatus as claimed in claim 2, wherein: The stirring blade unit includes a stirring blade, main crushing teeth, a toothed plate, and a baffle. The stirring blade is fixedly connected to the side wall of the drill bit assembly and extends outward along the radial direction of the drill bit assembly. A plurality of the main crushing teeth are fixed to one side wall of the stirring blade and are spaced apart. The toothed plate is fixed to the other side wall of the stirring blade. The baffle is fixed to the end of the stirring blade. Both the toothed plate and the baffle extend downward relative to the stirring blade. The lower edge of the toothed plate is provided with a first secondary crushing tooth distributed along the length direction. The lower edge of the baffle is provided with a second secondary crushing tooth distributed along the length direction. The crushing teeth are mainly composed of the main crushing teeth, the first secondary crushing teeth, and the second secondary crushing teeth.

4. A jetting pile apparatus as claimed in claim 3, wherein: The first crushing auxiliary teeth along the lower edge of the toothed plate are inclined, and the height of each first crushing auxiliary tooth increases radially from the inside to the outside.

5. The jet grouting pile device as described in claim 4, characterized in that: The second crushing auxiliary teeth along the lower edge of the baffle are inclined, and the height of each second crushing auxiliary tooth increases sequentially from front to back along the stirring direction.

6. The jet grouting pile device as described in claim 5, characterized in that: The main body of the crushing tooth is in the shape of a four-sided pyramid with its tip facing outward. The upper surface of the stirring blade has a first inclined surface and a second inclined surface. The upper inclined surface of the crushing tooth and the first and second inclined surfaces of the stirring blade are connected in sequence. The first inclined surface and the upper inclined surface are parallel. The inclination angle of the second inclined surface is smaller than that of the first inclined surface.

7. The jet grouting device as described in claim 1, characterized in that: The drill bit assembly includes an outer tube, to which a drill bit is fixedly connected at its lower end. An inner tube assembly, coaxial with the drill bit, is located inside the drill bit. An annular gap between the inner tube assembly and the outer tube serves as a gas channel. The cavity of the inner tube assembly serves as a solidified slurry channel. An opening is provided on the outer tube, and a mounting base is installed within the opening. A nozzle passes through the mounting base and is installed on the inner tube assembly. The nozzle's injection channel serves as a solidified slurry outlet and communicates with the solidified slurry channel. The annular gap between the nozzle and the mounting base serves as a gas outlet and communicates with the gas channel.

8. The jet grouting pile device as described in claim 7, characterized in that: The inner tube assembly includes an upper inner tube and a lower inner tube that are coaxially inserted from top to bottom. The upper end of the upper inner tube is limited by an upper limit stop provided on the inner sidewall of the outer tube. The lower end of the lower inner tube is closed and supported on a support shaft. The support shaft is supported by a lower support provided on the inner sidewall of the outer tube or the inner sidewall of the drill bit. The nozzle passes through the mounting seat and is installed on the lower inner tube and communicates with the cavity of the lower inner tube.

9. A jet grouting pile device as described in claim 8, characterized in that: The inner wall of the outer tube is provided with a first flange extending radially inward, and the first flange is provided with a plurality of first side channels extending from top to bottom. The portion of the inner upper tube above the first flange is provided with a second flange extending radially outward, and the second flange is attached to the inner side wall of the outer tube and is provided with a plurality of second side channels extending from top to bottom. The annular gap between the inner tube and the outer tube, the second side channel, and the annular gap between the upper inner tube, the lower inner tube, and the first flange are connected in sequence to form a gas channel. The cavities of the inner tube, the upper inner tube, and the lower inner tube are connected in sequence to form a solidified slurry channel.

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