Stirring and spraying pile device and construction technology thereof

Abstract

The invention relates to the technical field of engineering mechanical equipment, provides a stirring and spraying pile device and a construction process thereof, and solves the technical problems that a large-tonnage and large-torque stirring pile machine is required to be arranged in traditional large-diameter pile construction, and the energy consumption is high. The stirring and spraying pile device comprises a drilling tool, the drilling tool comprises a drill bit assembly and a stirring blade unit fixedly connected to the periphery of the drill bit assembly, and the stirring and spraying pile device is characterized in that the drilling tool is a rotary spraying drilling tool, and the drill bit assembly of the drilling tool is provided with a lateral nozzle; the two pairs of stirring blade units are arranged up and down at intervals and are distributed in a cross shape around the drill bit assembly; each stirring blade unit comprises stirring blades and crushing teeth distributed on the stirring blades, nozzles are arranged below the stirring blades of the pair of stirring blade units on the lower side, and spraying channels of the nozzles are not higher than the crushing teeth.

Description

Technical Field

[0001] This invention relates to the field of engineering machinery and equipment technology, specifically to a jet grouting pile device and its construction process. 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. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the present invention provides a grouting pile device and its construction process to solve the above-mentioned problems existing in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A jet grouting device includes a drilling tool, the drilling tool comprising a drill bit assembly and a stirring blade unit fixed to the outer periphery of the drill bit assembly, 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 is provided in two pairs, and the two pairs of stirring blade units are arranged at intervals above and below and distributed in a cross shape around the drill bit assembly. The stirring blade unit includes stirring blades and crushing teeth distributed on the stirring blades. A nozzle is provided below the stirring blades of the lower pair of stirring blade units, and the spray channel of the nozzle is not higher than the crushing teeth.

[0006] Furthermore, a downwardly extending baffle is installed at the front end of the stirring blade, and 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.

[0007] 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.

[0008] 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.

[0009] 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.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] 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. 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.

[0014] 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.

[0015] 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; The lower support is a step, which is located on the inner sidewall of the drill bit.

[0016] This invention also provides a construction process using the above-mentioned device, namely, a cement mixing pile construction process, which includes the following steps performed sequentially: S1, construction preparation and site leveling; S2, pile driver positioning; S3, preparation of curing slurry; S4, grouting and mixing, and sinking; S5, grouting and mixing, and lifting; characterized in that: In steps S4 and S5, during the process of the drill bit rotating down and rotating up, the solidified slurry pressurized by the high-pressure generator is sprayed out through the nozzle of the drill bit and forms a jet with a pressure of more than 20MPa to cut and break the soil. The stirring blade unit of the drill bit continues to break the soil and mixes the broken soil and solidified slurry evenly.

[0017] Furthermore, the jet is limited by the baffle of the stirring blade unit to control the cutting radius. At the same time, the baffle and the jet form an angle of 95°-100°. After the jet is turned by the baffle, it moistens the soil on the side in front of the direction of rotation of the baffle.

[0018] Furthermore, the construction process also includes step S6, which is a repetition of steps S4 and S5.

[0019] This invention provides a jet grouting pile device and its construction process, which has 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

[0020] Figure 1 This is a structural schematic diagram from a first perspective of the present invention; Figure 2 This is a structural schematic diagram from a second perspective of the present invention; Figure 3 This is a structural schematic diagram of the invention from a third perspective; Figure 4 This is a schematic diagram of the structure of the present invention from a third-view perspective, omitting the baffle. Figure 5 This is a cross-sectional view of the structure from a fourth perspective of the present invention; Figure 6 for Figure 5 A magnified structural diagram of point A in the middle; Figure 7 This is a cross-sectional view of the structure from the fifth perspective of the present invention; Figure 8 for Figure 7 A magnified structural diagram of section B in the middle.

[0021] In the picture: 1. Outer tube; 1a. First flange; 1a-1, First side passage; 2a. Second flange; 2a-1, Second side passage; 3. Inner lower connector; 4. Nozzle; 4a. Injection channel; 5. Support shaft; 5a. Third flange; 5a-1, Third Side Passage; 6. Drill bit; 6a. Steps; 7. Plug; 8. Agitator blades; 8a. First inclined plane; 8b. The second inclined plane; 9. Toothed plate; 9a. First crushing auxiliary tooth; 10. Baffle; 10a. Second crushing auxiliary tooth; 11. Broken main teeth; 11a, upper slope; 12. Snap ring; 13. Mounting bracket. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1

[0023] See attached document Figure 1-8 A 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 is a rotary jet grouting drill tool, and the drill bit assembly of the drilling tool is provided with a lateral nozzle 4. Among them, the jet grouting drill is an existing technology. The liquid channel, pressure generating device (specifically a high-pressure generating device) and solidified slurry storage tank of the jet grouting drill 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 to break up and liquefy the soil (from solidified soil state to mud state, with enhanced fluidity). The stirring blade unit is provided in two pairs, and the two pairs of stirring blade units are arranged at intervals above and below and distributed in a cross shape around the drill bit assembly. The stirring blade unit includes stirring blades 8 and breaking teeth distributed on the stirring blades 8. A nozzle 4 is provided below the stirring blades of the pair of stirring blade units on the lower side. The spray 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.

[0024] In this embodiment, the lower pair of stirring blade units have downwardly extending baffles 10 installed at the front ends of their stirring blades 8, as shown in the attached figure. Figure 3 , 4The 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.

[0025] Specifically, the lower 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 (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.

[0026] The upper stirring unit consists only of stirring blades 8 and toothed plate 9, and the toothed plate 9 is also provided with a first crushing auxiliary tooth 9a.

[0027] 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.

[0028] 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.

[0029] In this embodiment, the drill bit assembly includes an outer tube 1, with a drill bit 6 fixedly connected to its lower end. The drill bit 6 has a coaxial inner tube assembly inside. 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. The outer tube 1 has an opening, within which a mounting base 13 is installed. The nozzle 4 passes through the mounting base 13 and is installed on the inner tube assembly. The injection channel 4a of the nozzle 4 is 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 these two assemblies and the drill bit assembly. For details, please refer to the applicant's prior patent CN111287660A.

[0030] 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.

[0031] 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. 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. 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.

[0032] 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. Example 2

[0033] This embodiment provides the construction process of the device in Embodiment 1 above, namely the cement mixing pile construction process, which includes the following steps performed in sequence: S1, construction preparation and site leveling; S2, pile driver positioning; S3, preparation of curing slurry; S4, grouting and mixing, sinking; S5, grouting and mixing, lifting; S6, repeating steps S4 and S5; In steps S4 and S5, during the process of the drill bit rotating down and rotating up, the solidified slurry pressurized by the high-pressure generator is sprayed out through the nozzle of the drill bit and forms a jet with a pressure of 20-50MPa to cut, break, and liquefy the soil (changing from solidified soil to muddy state, with increased fluidity). The stirring blade unit of the drill bit continues to break the soil and mixes the broken soil and solidified slurry evenly.

[0034] The jet is limited by the baffle of the stirring blade unit to control the cutting radius. At the same time, the baffle and the jet are at an angle of 95°-100°. After cutting the soil, the jet, which is depressurized and decelerated, is turned by the baffle and moistens the soil in front of the direction of rotation of the baffle.

[0035] 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.

[0036] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention 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 the present invention.

Claims

1. A jet grouting device, comprising a drilling tool, the drilling tool including a drill bit assembly and a stirring blade unit fixed to the outer periphery of the drill bit assembly, characterized in that: The drilling tool is a rotary jet drilling tool, and the drill bit assembly is equipped with lateral nozzles; The stirring blade unit is provided in two pairs, and the two pairs of stirring blade units are arranged at intervals above and below and distributed in a cross shape around the drill bit assembly. The stirring blade unit includes stirring blades and crushing teeth distributed on the stirring blades. A nozzle is provided below the stirring blades of the lower pair of stirring blade units, and the spray channel of the nozzle is not higher than the crushing teeth.

2. The jet grouting pile device as described in claim 1, characterized in that: The front end of the stirring blade is equipped with a downwardly extending baffle, and 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. The jet grouting pile device as described in claim 2, characterized in that: 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. The jet grouting pile device as described in claim 3, characterized in that: 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.

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 construction process of the jet grouting pile device as described in any one of claims 2-7, the process comprising the following steps performed sequentially: S1, construction preparation and site leveling; S2, pile driver positioning; S3, preparation of solidifying grout; S4, jet grouting and mixing, sinking; S5, jet grouting and mixing, lifting; characterized in that: In steps S4 and S5, during the process of the drill bit rotating down and rotating up, the solidified slurry pressurized by the high-pressure generator is sprayed out through the nozzle of the drill bit and forms a jet with a pressure of more than 20MPa to cut and break the soil. The stirring blade unit of the drill bit continues to break the soil and mixes the broken soil and solidified slurry evenly.

9. The construction process of the jet grouting pile device as described in claim 8, characterized in that: The jet is limited by the baffle of the stirring blade unit to control the cutting radius. At the same time, the baffle and the jet are at an angle of 95°-100°. After the jet is turned by the baffle, it moistens the soil on the side in front of the direction of rotation of the baffle.

10. The construction process of the jet grouting pile device as described in claim 8, characterized in that: The construction process also includes step S6, which is a repetition of steps S4 and S5.

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