Bidirectional integral stirring equipment for reinforcing shallow soft foundation

Abstract

The invention relates to the technical field of soft foundation reinforcement, in particular to bidirectional integral stirring equipment for reinforcing a shallow soft foundation, which comprises a bracket, and further comprises a distance adjusting mechanism arranged between an inner rotating shaft and a drill bit and used for adjusting the distance between the drill bit and the inner rotating shaft; the negative pressure dust suction mechanism is arranged on the support, the dust inlet end of the negative pressure dust suction mechanism is located above the upper stirring blade, and the dust outlet end of the negative pressure dust suction mechanism communicates with the feeding end of the high-pressure grouting unit; according to the invention, the distance between the upper stirring blade and the lower stirring blade can be adjusted according to the thickness of a soft soil layer, so that the stirring equipment better fits a soft soil structure on site, and the use effect is better; and moreover, the dust outlet end of the negative pressure dust collection mechanism communicates with the feeding end of the high-pressure grouting unit, dust can be guided into a material filling area, the collected dust does not need to be additionally treated, and the requirement for green construction is met.

Description

Technical Field

[0001] The invention relates to the technical field of soft foundation reinforcement, in particular to a bidirectional integral mixing device for reinforcing shallow soft foundation. Background Art

[0002] Weak foundations include silt, silty soil, peat, peaty soil, etc. These soils have high natural water content, large porosity, high compressibility, and low shear strength. If not handled properly, they can easily cause road subsidence or breakage of buried pipes. At present, the cement-soil mixing pile method is commonly used to reinforce soft foundations: cement is used as the main agent of the curing agent, and a mixing pile machine is used to spray cement into the soil and fully mix it. After a series of physical and chemical reactions between cement and soil, the soil is consolidated to form cement-soil piles with integrity, water stability, and a certain strength, thereby achieving the effect of improving the strength of the foundation.

[0003] In the prior art, the bidirectional integral mixing equipment usually includes a bracket, a feeding system, a bidirectional mixing pile, a driving mechanism and a lifting mechanism. During the construction process, the feeding system injects cement into the bidirectional mixing pile through a pipeline. During the process of drilling holes in the ground or pulling out the bidirectional mixing pile from the pile hole on the ground, cement slurry is continuously injected into the soil while continuous and sufficient mixing is performed. When the bidirectional mixing pile is completely pulled out of the pile hole on the ground, it is left to stand for a period of time to finally form a cement pile.

[0004] In the above technologies, bidirectional mixing piles are generally mixed in both directions by upper and lower mixing mechanisms. However, in order to facilitate the transportation of slurry, the distance between the upper and lower mixing mechanisms is generally fixed, which makes it impossible to adjust according to the thickness of the soft soil layer. At the same time, during the mixing process, the upper mixing layer is prone to dust, which makes it impossible to meet the requirements of green construction. To this end, we proposed a bidirectional integral mixing equipment for reinforcing shallow soft foundations to effectively solve the above drawbacks. Summary of the invention

[0005] The object of the present invention is to provide a bidirectional integral mixing device for reinforcing shallow soft foundation, so as to solve the problems raised in the above-mentioned background technology.

[0006] The present invention is realized by the following technical scheme: a bidirectional integral mixing device for reinforcing shallow soft foundation, comprising a bracket and also comprising:

[0007] An outer rotating shaft, which is arranged in the vertical direction and is a hollow shaft, and a plurality of upper stirring blades are fixedly connected to the proximal end of the lower end of the outer rotating shaft along the circumferential direction;

[0008] An inner rotating shaft, the inner rotating shaft moves through the outer rotating shaft in a vertical direction and is coaxially arranged with the outer rotating shaft;

[0009] A bidirectional power transmission unit, which is arranged on the bracket and is in driving connection with the outer rotating shaft and the inner rotating shaft, and is used to drive the outer rotating shaft and the inner rotating shaft to rotate bidirectionally;

[0010] A drill bit, wherein a plurality of lower stirring blades are fixedly connected to the proximal end of the upper end of the drill bit along the circumferential direction;

[0011] A spacing adjustment mechanism, the spacing adjustment mechanism is arranged between the inner rotating shaft and the drill bit, and is used to adjust the distance between the drill bit and the inner rotating shaft;

[0012] A high-pressure grouting unit, wherein the feed end of the high-pressure grouting unit is conductively connected to an external feeder, and a plurality of grouting ports conductively connected to the discharge end of the high-pressure grouting unit are provided at intervals along the circumferential direction on the side of the drill bit;

[0013] A negative pressure dust suction mechanism is provided on the bracket, a dust inlet end of the negative pressure dust suction mechanism is located above the upper stirring blade, and a dust outlet end of the negative pressure dust suction mechanism is connected to the feed end of the high pressure grouting unit.

[0014] Optionally, an annular groove is opened in the middle of the drill bit along the circumferential direction, and an annular sealing assembly is arranged on the outer surface of the drill bit. The annular sealing assembly and the annular groove cooperate to form an annular sealing cavity.

[0015] Optionally, the annular sealing assembly includes an annular protective sleeve movably mounted on the outer surface of the drill bit, a plurality of countersunk screws threadedly connected to the drill bit are circumferentially spaced apart at the proximal end of the lower end of the annular protective sleeve, a positioning groove corresponding to each lower stirring blade is provided at the upper end of the annular protective sleeve, and an avoidance groove corresponding to each spraying port is provided at the upper end of the annular protective sleeve.

[0016] Optionally, the drill bit comprises a large outer diameter section, a small outer diameter section and a drilling section arranged in sequence from top to bottom;

[0017] The lower stirring blade and the spraying port are respectively arranged on the outer surface of the large outer diameter section, the annular groove is arranged on the periphery of the small outer diameter section, and the annular sealing assembly is arranged between the large outer diameter section and the drilling section.

[0018] Optionally, the spacing adjustment mechanism includes an adjustment groove provided at the upper end of the large outer diameter section, the lower end of the inner rotating shaft is movably inserted into the adjustment groove, two adjustment rods are parallelly and fixedly connected to the lower end surface of the inner rotating shaft, and each adjustment rod moves vertically through the large outer diameter section and the lower end extends into the annular groove;

[0019] A sliding sleeve movably mounted on the small outer diameter section is fixedly connected between the two adjusting rods. The small outer diameter section is penetrated with a plurality of adjusting holes at intervals in the vertical direction. The sliding sleeve is detachably provided with fixing bolts matching the adjusting holes.

[0020] Optionally, the movable sleeve on the adjusting rod is provided with an auxiliary locking nut that fits with the lower end surface of the large outer diameter section, and a threaded structure that matches the auxiliary locking nut is provided on the outer surface of the adjusting rod.

[0021] Optionally, the sliding sleeve is composed of two sliding blocks that cooperate with each other and are movably clamped on the small outer diameter section;

[0022] A connecting plate is fixedly connected to both sides of each slider, and the two connecting plates on the same side are movably clamped on the corresponding adjusting rod in cooperation with each other, and connecting bolts are detachably inserted between the two connecting plates on the same side and the adjusting rod.

[0023] Optionally, the high-pressure grouting unit includes a rotary joint fixed on the bracket and located above the inner rotating shaft, the stationary joint of the rotary joint is conductively connected to a grouting pipe, the grouting pipe is conductively connected to an external feeding device, and the dust outlet end of the negative pressure dust suction mechanism is conductively connected to the grouting pipe;

[0024] A slurry flow channel is axially arranged inside the inner rotating shaft, the rotating joint of the rotary joint is conductively connected to the slurry flow channel, and a bellows is conductively connected between the lower end of the slurry flow channel and the spraying port.

[0025] Optionally, the negative pressure dust suction mechanism comprises a casing arranged on a bracket, an impeller for generating negative air pressure is arranged in the casing, a wheel shaft is fixedly connected to the axis of the impeller, one end of the wheel shaft movably extends outside the casing and is drivingly connected to the outer rotating shaft;

[0026] The dust outlet end of the casing is connected to the feed end of the high-pressure grouting unit through a pipeline, and the dust inlet end of the casing is connected to an annular dust suction pipe located between the bracket and the upper stirring blade through a pipeline, and a plurality of dust suction ports are arranged at intervals along the circumferential direction at the bottom of the annular dust suction pipe.

[0027] Compared with the prior art, the present invention provides a bidirectional integral mixing device for reinforcing shallow soft foundation, which has the following beneficial effects:

[0028] 1. The present invention provides a spacing adjustment mechanism between the drill bit and the inner rotating shaft, which can adjust the distance between the drill bit and the inner rotating shaft, so that the spacing between the upper stirring blade and the lower stirring blade can be adjusted according to the thickness of the soft soil layer, so that the stirring equipment can be more closely fitted to the soft soil structure on site, and the use effect is better.

[0029] 2. The present invention integrates dust prevention and stirring, so that dust prevention works simultaneously with stirring, and dust can be quickly collected, thereby realizing green construction. In addition, the dust outlet of the negative pressure dust suction mechanism is connected to the feed end of the high-pressure grouting unit, and dust can be introduced into the filling area, without the need for additional treatment of the collected dust, thus meeting the requirements of green construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0032] Figure 3 for Figure 1 A local enlarged schematic diagram of the middle A;

[0033] Figure 4 It is a partial schematic diagram of the annular sealing assembly of the present invention after being removed;

[0034] Figure 5 It is a top view of the sliding sleeve of the present invention.

[0035] In the figure: 1, bracket; 2, outer rotating shaft; 3, upper stirring blade; 4, inner rotating shaft; 5, two-way power transmission unit; 6, drill bit; 601, large outer diameter section; 602, small outer diameter section; 603, drilling section; 7, lower stirring blade; 8, spacing adjustment mechanism; 801, adjustment slot; 802, adjustment rod; 803, sliding sleeve; 804, adjustment hole; 805, fixing bolt; 806, auxiliary locking nut; 807, connecting plate; 80 8. Connecting bolts; 9. High-pressure grouting unit; 901. Rotary joint; 902. Grouting pipe; 903. Bellows; 10. Spraying port; 11. Negative pressure dust suction mechanism; 111. Casing; 112. Impeller; 113. Axle; 114. Annular dust suction pipe; 115. Dust suction port; 12. Annular groove; 13. Annular sealing assembly; 131. Annular protective sleeve; 132. Countersunk screw; 133. Positioning slot; 134. Avoidance slot. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0037] Example: See Figures 1 to 5 , a two-way integral mixing device for reinforcing shallow soft foundation, comprising a bracket 1, wherein the bracket 1 can be connected to an external excavator or other lifting device so that the bracket can be lifted and lowered in the vertical direction. Figure 1 and Figure 2 As shown, the bracket 1 is composed of a box body and a mounting plate fixed on the outside of the box body. The box body provides installation space for other components in the device, and the mounting plate can be connected to an external excavator or other lifting devices.

[0038] This embodiment further includes an outer rotating shaft 2 , an inner rotating shaft 4 , a bidirectional power transmission unit 5 , a drill bit 6 , a spacing adjustment mechanism 8 , a high-pressure grouting unit 9 and a negative-pressure dust suction mechanism 11 .

[0039] Among them, the outer rotating shaft 2 is arranged in the vertical direction and is a hollow shaft, so that other components can pass through the inner part of the outer rotating shaft 2. A plurality of upper stirring blades 3 are fixedly connected along the circumferential direction at the lower proximal end of the outer rotating shaft 2. The outer rotating shaft 2 rotates in one direction, so that the soft soil foundation can be stirred by the upper stirring blades 3. In this embodiment, the outer rotating shaft 2 can be rotatably connected to the box body through the cooperation of the bearing and the shaft seat. The inner rotating shaft 4 moves through the outer rotating shaft 2 in the vertical direction and is coaxially arranged with the outer rotating shaft 2; the rotation direction of the inner rotating shaft 4 is opposite to the rotation direction of the outer rotating shaft 2, thereby realizing a two-way stirring function.

[0040] Secondly, the bidirectional power transmission unit 5 is arranged on the bracket 1 and is in transmission connection with the outer rotating shaft 2 and the inner rotating shaft 4, and is used to drive the outer rotating shaft 2 and the inner rotating shaft 4 to rotate bidirectionally. Figure 2 As shown, the bidirectional power transmission unit 5 includes a motor arranged at the top of the outer casing, a driving shaft connected to the output end of the motor through the bearing and the shaft seat in the casing, a driving sprocket and a driving gear are arranged on the driving shaft from top to bottom in sequence, and a driven gear matched with the driving gear is arranged at the upper proximal end of the outer rotating shaft 2. When the motor is working, the outer rotating shaft 2 is driven to rotate in one direction through the cooperation of the driving gear and the driven gear. A driven sprocket is arranged at the upper proximal end of the inner rotating shaft 4, and a chain is connected between the driving sprocket and the driven sprocket. When the motor is working, the inner rotating shaft 4 is driven to rotate in one direction through the cooperation of the driving sprocket, the driven sprocket and the chain, and the rotation direction is different from the rotation direction of the gear transmission structure. After adopting this structure, only one motor needs to be arranged to drive the outer rotating shaft 2 and the inner rotating shaft 4 to move in different rotation directions, with a compact structure and low cost of use.

[0041] In this embodiment, if Figure 3 and Figure 4 As shown, the upper proximal end of the drill bit 6 is fixedly connected with a plurality of lower stirring blades 7 along the circumferential direction. Specifically, an annular groove 12 is opened along the circumferential direction in the middle of the drill bit 6, and an annular sealing component 13 is arranged on the outer surface of the drill bit 6. The annular sealing component 13 and the annular groove 12 cooperate to form an annular sealing cavity. Other components in the device that need to be manually operated can be arranged in the annular sealing cavity. Since external impurities such as mud cannot enter the annular sealing cavity, during the stirring process, external impurities such as mud can be prevented from contacting with components that need to be manually operated, effectively reducing the adverse effects of impurities such as mud on the components.

[0042] Furthermore, if Figure 1As shown, the annular sealing assembly 13 includes an annular protective sleeve 131 movably mounted on the outer surface of the drill bit 6, which can seal the annular groove 12. A plurality of countersunk screws 132 threadedly connected to the drill bit 6 are arranged at intervals along the circumferential direction at the lower proximal end of the annular protective sleeve 131, and a positioning card slot 133 corresponding to each lower stirring blade 7 is provided at the upper end of the annular protective sleeve 131, which can locate the position of the annular protective sleeve 131, so that the countersunk screw 132 can be installed smoothly; at the same time, under the action of the positioning card slot 133 and the lower stirring blade 7, the annular protective sleeve 131 is not easy to rotate relative to the drill bit 6, thereby improving the stability during use. A avoidance groove 134 corresponding to each spraying port 10 is provided at the upper end of the annular protective sleeve 131, so that the reinforcement slurry can be sprayed out smoothly. When it is necessary to manually operate the parts inside the annular sealing chamber, first remove the countersunk screw 132, then move the annular protective sleeve 131 downward to separate the annular protective sleeve 131 from the drill bit 6, so that the parts inside the annular sealing chamber can be manually operated. After the operation is completed, the annular protective sleeve 131 is put on the drill bit 6 from bottom to top, and the lower stirring blade 7 can be stuck in the positioning groove 133 until it reaches the limit position, so that the position of the annular protective sleeve 131 can be positioned, and finally the countersunk screw 132 is passed through the annular protective sleeve 131 and screwed into the drill bit 6.

[0043] Specifically, if Figure 3 and Figure 4 As shown, the drill bit 6 includes a large outer diameter section 601, a small outer diameter section 602 and a drilling section 603 which are arranged in sequence from top to bottom; the lower stirring blade 7 is arranged on the outer surface of the large outer diameter section 601, the annular groove 12 is arranged on the periphery of the small outer diameter section 602, and the annular sealing assembly 13 is arranged between the large outer diameter section 601 and the drilling section 603. This layout is adopted to facilitate the processing and assembly of the corresponding components.

[0044] In this embodiment, the distance adjustment mechanism 8 is disposed between the inner rotating shaft 4 and the drill bit 6, and is used to adjust the distance between the drill bit 6 and the inner rotating shaft 4. Figure 3 and Figure 4As shown, the spacing adjustment mechanism 8 includes an adjustment groove 801 provided at the upper end of the large outer diameter section 601. The lower end of the inner rotating shaft 4 is movably inserted into the adjustment groove 801 and can slide up and down in the adjustment groove 801, thereby adjusting the spacing between the inner rotating shaft 4 and the drill bit 6. Two adjustment rods 802 are parallelly and fixedly connected to the lower end surface of the inner rotating shaft 4. Each adjustment rod 802 movably passes through the large outer diameter section 601 in the vertical direction and the lower end extends into the annular groove 12. During the adjustment process, the adjustment rod 802 can move up and down with the inner rotating shaft 4. A sliding sleeve 803 movably sleeved on the small outer diameter section 602 is fixedly connected between the two adjustment rods 802. A plurality of adjustment holes 804 are penetrated in the small outer diameter section 602 at intervals in the vertical direction. A fixing bolt 805 matching the adjustment hole 804 is detachably penetrated on the sliding sleeve 803. When the spacing between the upper stirring blade 3 and the lower stirring blade 7 needs to be adjusted, the annular protective sleeve 131 is first removed, and then the fixing bolt 805 is removed, and then the sliding sleeve 803 is slid up and down along the small outer diameter section 602, so that the inner rotating shaft 4 is driven to slide up and down in the adjusting groove 801 through the adjusting rod 802, and the distance between the drill bit 6 and the inner rotating shaft 4 can be adjusted, thereby adjusting the spacing between the upper stirring blade 3 and the lower stirring blade 7. After the adjustment is completed, the fixing bolt 805 is passed through the sliding sleeve 803 and the adjusting hole 804, so that the sliding sleeve 803 and the small outer diameter section 602 are fixed, and finally the annular protective sleeve 131 is installed.

[0045] Preferably, the movable sleeve on the adjusting rod 802 is provided with an auxiliary locking nut 806 that fits with the lower end surface of the large outer diameter section 601, and a threaded structure that matches the auxiliary locking nut 806 is provided on the outer surface of the adjusting rod 802. When the relative position of the drill bit 6 and the inner rotating shaft 4 is fixed by the cooperation of the sliding sleeve 803, the fixing bolt 805 and the adjusting hole 804, the auxiliary locking nut 806 can be tightened, and the relative position of the drill bit 6 and the inner rotating shaft 4 can be further fixed by using the threaded structure, thereby improving the stability of the structure when in use.

[0046] Preferably, Figures 3 to 5 As shown, the sliding sleeve 803 is composed of two sliders that cooperate with each other and are movably clamped on the small outer diameter section 602; a connecting plate 807 is fixedly connected on both sides of each slider, and the two connecting plates 807 on the same side cooperate with each other and are movably clamped on the corresponding adjustment rod 802, and a connecting bolt 808 is detachably inserted between the two connecting plates 807 on the same side and the adjustment rod 802. The sliding sleeve 803 adopts a split structure, which is convenient for assembly on the small outer diameter section 602. When the sliding sleeve 803 is severely worn and needs to be replaced, the connecting bolt 808 is first removed to separate the connecting plate 807 from the adjustment rod 802, so that the two sliders can be separated and removed from the small outer diameter section 602, which has a simple structure and is easy to operate.

[0047] In addition, the feed end of the high-pressure grouting unit 9 is connected to the external feeder, and a plurality of grouting ports 10 connected to the discharge end of the high-pressure grouting unit 9 are provided at intervals along the circumferential direction on the side of the drill bit 6. In this embodiment, the grouting ports 10 are provided on the side of the large outer diameter section 601. Specifically, Figure 2 and Figure 3 As shown, the high-pressure grouting unit 9 includes a rotary joint 901 fixed on the bracket 1 and located above the inner rotating shaft 4, the stationary joint of the rotary joint 901 is conductively connected with a grouting pipe 902, the grouting pipe 902 is conductively connected with an external feeding device, and the dust outlet end of the negative pressure dust suction mechanism 11 is conductively connected with the grouting pipe 902, and the collected dust can be introduced into the grouting pipe 902. A slurry flow channel is axially arranged inside the inner rotating shaft 4, the rotary joint of the rotary joint 901 is conductively connected with the slurry flow channel, and a bellows 903 is conductively connected between the lower end of the slurry flow channel and the spraying port 10. In this embodiment, the bellows 903 is arranged in the adjustment groove 801, and can be contracted as the inner rotating shaft 4 slides up and down in the adjustment groove 801, without affecting the flow of the slurry.

[0048] Finally, the negative pressure dust suction mechanism 11 is arranged on the bracket 1, the dust inlet end of the negative pressure dust suction mechanism 11 is located above the upper stirring blade 3, and the dust outlet end of the negative pressure dust suction mechanism 11 is connected to the feed end of the high pressure grouting unit 9. Specifically, as Figure 1 and Figure 2 As shown, the negative pressure dust suction mechanism 11 includes a housing 111 arranged on a bracket 1, an impeller 112 for generating air negative pressure is arranged in the housing 111, and a wheel shaft 113 is fixedly connected at the axis of the impeller 112, and one end of the wheel shaft 113 is movably extended to the outside of the housing 111 and is connected to the outer rotating shaft 2. In this embodiment, a linkage gear matched with a driven gear is arranged on the wheel shaft 113. When the outer rotating shaft 2 rotates, the wheel shaft 113 can be driven to rotate, thereby driving the impeller 112 to rotate, generating air negative pressure, and performing dust suction work. No external drive is required, which effectively reduces the cost, and dust removal and stirring can be performed at the same time. The dust outlet end of the housing 111 is connected to the feed end of the high-pressure grouting unit 9 through a pipeline, and a one-way valve is arranged on the pipeline to prevent the slurry from entering the housing 111. The dust inlet end of the housing 111 is connected to an annular dust suction pipe 114 located between the bracket 1 and the upper mixing blade 3 through a pipeline, the outer rotating shaft 2 passes through the annular dust suction pipe 114, and a plurality of dust suction ports 115 are arranged at intervals along the circumferential direction at the bottom of the annular dust suction pipe 114. When the impeller 112 rotates to generate negative air pressure, the dust generated during the mixing process can enter the annular dust suction pipe 114 through the dust suction port 115, and then enter the grouting pipe 902 through the pipeline, the housing 111, etc., meeting the green construction requirements.

[0049] When in use, the bidirectional power transmission unit 5 works, driving the outer rotating shaft 2 and the inner rotating shaft 4 to rotate bidirectionally, and then the bracket 1 is driven downward by the external lifting device, so that the soft soil foundation can be bidirectionally stirred by the upper stirring blade 3 and the lower stirring blade 7. During the stirring process, the slurry for external reinforcement is injected into the soil through the high-pressure grouting unit 9 and the spraying port 10; at the same time, when the outer rotating shaft 2 rotates, the impeller 112 is driven to rotate synchronously, generating negative air pressure, and the dust generated during the stirring process can be transported to the high-pressure grouting unit 9 through the negative pressure dust suction mechanism 11, thereby introducing the dust into the filling area to achieve green construction.

[0050] When the distance between the upper stirring blade 3 and the lower stirring blade 7 needs to be adjusted, the annular protective sleeve 131 is first removed, and then the fixing bolt 805 is removed, so that the sliding sleeve 803 can slide up and down along the small outer diameter section 602, thereby adjusting the distance between the upper stirring blade 3 and the lower stirring blade 7. After the adjustment is completed, the fixing bolt 805 is passed through the sliding sleeve 803 and the adjustment hole 804 to fix the position between the drill bit 6 and the inner rotating shaft 4, and finally the annular protective sleeve 131 is installed.

[0051] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0052] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bidirectional integral mixing device for reinforcing shallow soft foundation, comprising a bracket (1), characterized in that: Also includes: An outer rotating shaft (2), the outer rotating shaft (2) being arranged in a vertical direction and being a hollow shaft, and a plurality of upper stirring blades (3) being fixedly connected to the proximal end of the lower end of the outer rotating shaft (2) in a circumferential direction; An inner rotating shaft (4), the inner rotating shaft (4) movably passes through the outer rotating shaft (2) in a vertical direction and is coaxially arranged with the outer rotating shaft (2); A bidirectional power transmission unit (5), the bidirectional power transmission unit (5) being arranged on the bracket (1) and being in transmission connection with the outer rotating shaft (2) and the inner rotating shaft (4), and being used for driving the outer rotating shaft (2) and the inner rotating shaft (4) to rotate bidirectionally; A drill bit (6), wherein a plurality of lower stirring blades (7) are fixedly connected to the proximal end of the upper end of the drill bit (6) along the circumferential direction; A spacing adjustment mechanism (8), wherein the spacing adjustment mechanism (8) is arranged between the inner rotating shaft (4) and the drill bit (6) and is used to adjust the distance between the drill bit (6) and the inner rotating shaft (4); A high-pressure grouting unit (9), wherein a feed end of the high-pressure grouting unit (9) is conductively connected to an external feed device, and a plurality of grouting ports (10) are provided at intervals along the circumferential direction on the side of the drill bit (6) and are conductively connected to a discharge end of the high-pressure grouting unit (9); A negative pressure dust suction mechanism (11) is arranged on the bracket (1), the dust inlet end of the negative pressure dust suction mechanism (11) is located above the upper stirring blade (3), and the dust outlet end of the negative pressure dust suction mechanism (11) is connected to the feed end of the high-pressure grouting unit (9).

2. The bidirectional integral mixing equipment for reinforcing shallow soft foundation according to claim 1 is characterized in that: An annular groove (12) is provided in the middle of the drill bit (6) along the circumferential direction, and an annular sealing component (13) is provided on the outer surface of the drill bit (6). The annular sealing component (13) and the annular groove (12) cooperate to form an annular sealing cavity.

3. The bidirectional integral mixing equipment for reinforcing shallow soft foundation according to claim 2 is characterized in that: The annular sealing assembly (13) comprises an annular protective sleeve (131) movably sleeved on the outer surface of the drill bit (6); a plurality of countersunk screws (132) threadedly connected to the drill bit (6) are circumferentially arranged at intervals at the lower proximal end of the annular protective sleeve (131); positioning grooves (133) corresponding to the lower stirring blades (7) are provided at the upper end of the annular protective sleeve (131); and avoidance grooves (134) corresponding to the spraying ports (10) are provided at the upper end of the annular protective sleeve (131).

4. The bidirectional integral mixing equipment for reinforcing shallow soft foundation according to claim 2 is characterized in that: The drill bit (6) comprises a large outer diameter section (601), a small outer diameter section (602) and a drilling section (603) which are arranged in sequence from top to bottom; The lower stirring blade (7) and the spraying port (10) are respectively arranged on the outer surface of the large outer diameter section (601), the annular groove (12) is arranged on the periphery of the small outer diameter section (602), and the annular sealing assembly (13) is arranged between the large outer diameter section (601) and the drilling section (603).

5. The bidirectional integral mixing equipment for reinforcing shallow soft foundation according to claim 4 is characterized in that: The spacing adjustment mechanism (8) comprises an adjustment groove (801) provided at the upper end of the large outer diameter section (601), the lower end of the inner rotating shaft (4) is movably inserted into the adjustment groove (801), and two adjustment rods (802) are parallelly and fixedly connected to the lower end surface of the inner rotating shaft (4) at intervals, each adjustment rod (802) movably passes through the large outer diameter section (601) in a vertical direction and the lower end of each adjustment rod (802) extends into the annular groove (12); A sliding sleeve (803) movably mounted on the small outer diameter section (602) is fixedly connected between the two adjustment rods (802), a plurality of adjustment holes (804) are penetrated at intervals in the vertical direction on the small outer diameter section (602), and a fixing bolt (805) matching the adjustment hole (804) is detachably mounted on the sliding sleeve (803).

6. The bidirectional integral mixing equipment for reinforcing shallow soft foundation according to claim 5, characterized in that: The movable sleeve on the adjusting rod (802) is provided with an auxiliary locking nut (806) which fits with the lower end surface of the large outer diameter section (601), and the outer surface of the adjusting rod (802) is provided with a thread structure which matches with the auxiliary locking nut (806).

7. The bidirectional integral mixing equipment for reinforcing shallow soft foundation according to claim 5, characterized in that: The sliding sleeve (803) is composed of two sliding blocks which cooperate with each other and are movably clamped on the small outer diameter section (602); A connecting plate (807) is fixedly connected to both sides of each slider, and the two connecting plates (807) on the same side cooperate with each other to be movably clamped on the corresponding adjustment rod (802), and a connecting bolt (808) is detachably inserted between the two connecting plates (807) on the same side and the adjustment rod (802).

8. The bidirectional integral mixing equipment for reinforcing shallow soft foundation according to claim 1, characterized in that: The high-pressure grouting unit (9) comprises a rotary joint (901) fixed on the bracket (1) and located above the inner rotating shaft (4); a stationary joint of the rotary joint (901) is conductively connected to a grouting pipe (902); the grouting pipe (902) is conductively connected to an external feeding device; and a dust outlet end of the negative pressure dust suction mechanism (11) is conductively connected to the grouting pipe (902); A slurry flow channel is arranged axially inside the inner rotating shaft (4); the rotating joint of the rotating joint (901) is conductively connected to the slurry flow channel; and a bellows (903) is conductively connected between the lower end of the slurry flow channel and the spraying port (10).

9. The bidirectional integral mixing equipment for reinforcing shallow soft foundation according to claim 1, characterized in that: The negative pressure dust suction mechanism (11) comprises a casing (111) arranged on a bracket (1), an impeller (112) for generating negative air pressure is arranged inside the casing (111), a wheel shaft (113) is fixedly connected to the axis of the impeller (112), and one end of the wheel shaft (113) movably extends outside the casing (111) and is drivingly connected to the outer rotating shaft (2); The dust outlet end of the casing (111) is connected to the feed end of the high-pressure grouting unit (9) through a pipeline, and the dust inlet end of the casing (111) is connected to an annular dust suction pipe (114) located between the bracket (1) and the upper stirring blade (3) through a pipeline, and a plurality of dust suction ports (115) are arranged at intervals along the circumferential direction at the bottom of the annular dust suction pipe (114).

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