Cage type mixer suitable for high-strength deep curing mixing pile construction
By using a cage mixer for high-strength deep-solidification mixing pile construction in foundation pit support engineering, and utilizing a fixed ring and mixing blades to spray solidified grout into the soil, the high cost of plain concrete cast-in-place piles in foundation pit support engineering is solved, and high strength and verticality control of mixing piles are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHENZHEN HONGYEJI GEOTECHNICAL TECH CO LTD
- Filing Date
- 2023-12-29
- Publication Date
- 2026-07-03
AI Technical Summary
In existing technologies, the use of plain concrete cast-in-place piles in foundation pit support projects is costly, and there are also issues related to the cost of transporting excavated soil and replacing concrete materials.
A cage-type mixer suitable for high-strength deep-solidification mixing pile construction is adopted. The mixer drills into the soil through the fixed ring on the mixing shaft, the internal and lower mixing blades, and the bottom drill teeth. At the same time, solidification grout is sprayed to form a fluid solidified soil grout. The drilling direction is guided by the fixed ring to ensure verticality.
It reduced the cost of foundation pit support engineering, improved the strength of mixing piles, avoided the transportation of excavated soil and the replacement of concrete materials, and ensured the verticality and uniformity of mixing during the drilling process.
Smart Images
Figure CN117738187B_ABST
Abstract
Description
Technical Field
[0001] This invention patent relates to the technical field of mixing piles, and more specifically, to a cage mixer suitable for the construction of high-strength deep-solidification mixing piles. Background Technology
[0002] In foundation pit support engineering, interlocking piles are widely used due to their advantages of combining retaining capacity, water stopping, and low cost. Interlocking piles consist of reinforced concrete cast-in-place piles interlocked with adjacent plain concrete cast-in-place piles. This process typically involves first constructing plain concrete cast-in-place piles intermittently using a rotary drilling rig. After the plain concrete has fully set and its strength is still relatively low, a hole is cut between two plain concrete piles, a reinforcing cage is inserted, and reinforced concrete is poured to construct the reinforced concrete cast-in-place pile. The plain concrete piles and reinforced concrete piles interlock to form a continuous retaining structure with excellent seepage prevention.
[0003] In existing technologies, interlocking piles are already less expensive than support structures such as diaphragm walls. However, because rotary drilling rigs are used to drill holes, the underground soil is removed and then concrete is poured. The removed soil needs to be disposed of and transported off-site, which is troublesome and incurs transportation costs. In addition, the soil inside the pile is filled with expensive concrete materials, which increases the cost. Summary of the Invention
[0004] The purpose of this invention is to provide a cage mixer suitable for the construction of high-strength deep-solidification mixing piles, aiming to solve the problem of high cost of using plain concrete cast-in-place piles in foundation pit support engineering in the prior art.
[0005] This invention is implemented as follows: a cage mixer suitable for the construction of high-strength deep-solidification mixing piles, used for mixing and drilling in soil, includes a mixing shaft driven by a power source, with multiple horizontally arranged fixing rings fitted around the outer circumference of the mixing shaft, the multiple fixing rings being spaced apart along the axial direction of the mixing shaft; the multiple fixing rings are arranged coaxially vertically, the mixing shaft passes through the center of the multiple fixing rings, and the mixing shaft is rotatably connected to the multiple fixing rings;
[0006] A cylindrical cavity is formed by the plurality of fixed rings. The stirring shaft has an inner section that passes through the cylindrical cavity and a lower section that extends to the bottom of the cylindrical cavity. The inner section is provided with a plurality of inner stirring blades, which are arranged at intervals along the circumference and axial direction of the inner section and are located in the cylindrical cavity. The lower section is provided with a plurality of lower stirring blades, which are arranged at intervals along the circumference and axial direction of the lower section.
[0007] The bottom of the lower section is provided with multiple bottom drill teeth, the mixing shaft is provided with a slurry outlet channel, the bottom of the slurry outlet channel forms a bottom slurry outlet, and the top of the slurry outlet channel is connected to the grouting pump through a grouting pipe; when the mixing shaft drills into the soil, the multiple bottom drill teeth drill downwards into the soil, the multiple internal mixing blades and the multiple lower mixing blades mix the soil, and the multiple fixing rings guide the drilling direction of the mixing shaft.
[0008] Optionally, the bottom of the lower segment is provided with a plurality of inclined strips, the plurality of inclined strips being arranged around the lower segment at circumferential intervals, and the plurality of bottom drill teeth being protruding from the bottom of the inclined strips.
[0009] Optionally, the inner end of the inclined strip is connected to the bottom of the lower section, and the outer end of the inclined strip is arranged inclined upward away from the lower section.
[0010] Optionally, the plurality of bottom drill teeth are arranged at intervals along the length of the inclined strip, and adjacent bottom drill teeth are arranged in a staggered, opposite-south orientation.
[0011] Optionally, a plurality of longitudinally arranged connecting pieces are connected between adjacent fixing rings. The plurality of connecting pieces are spaced around the circumference of the fixing rings. The two ends of the connecting pieces are respectively fixedly connected to the outer periphery of the two fixing rings. There is a longitudinal gap between adjacent connecting pieces. The cylinder cavity is connected to the outside through the longitudinal gap.
[0012] Optionally, the inner end of the internal stirring blade is abutted against the outer periphery of the inner section, the outer end of the internal stirring blade extends outward away from the inner section, and there is an internal gap between it and the inner sidewall of the fixing ring. Along the axial direction of the inner section, the internal stirring blade is arranged at an angle.
[0013] Optionally, the adjacent internal stirring blades may have different inclination directions.
[0014] Optionally, the bottom of the stirring shaft has a downward-facing sidewall, and the downward-facing sidewall is provided with a plurality of downward-facing drill teeth, and the plurality of downward-facing sidewalls are arranged in a straight line.
[0015] Optionally, the bottom of the lower section is concave upwards to form a concave area with a bottom opening; the slurry outlet has a slurry outlet section located in the lower section, the lower part of the slurry outlet section is concave and expands outwards to form an expansion cavity, the bottom of the expansion cavity forms the bottom slurry outlet, and the bottom slurry outlet is located at the top of the concave area;
[0016] A horizontally arranged metal mesh is provided in the middle of the recessed area, and the metal mesh is located between the bottom slurry outlet and the bottom opening; multiple side slurry outlets are provided on the outer periphery of the lower section, and the expansion cavity is connected to the outside through the side slurry outlets. Along the direction from the inside to the outside of the expansion cavity, the side slurry outlets are arranged at an upward inclination.
[0017] During the drilling process in the soil, the solidified grout enters the grout outlet section of the grout outlet channel and fills the expansion cavity. The solidified grout is sprayed downward through the bottom grout outlet, dispersed through the metal mesh, and then sprayed downward into the soil. The solidified grout is also sprayed upward into the soil through the side grout outlet.
[0018] Optionally, the inner wall of the expansion cavity is covered with an elastically deformable airbag layer, the top of the expansion cavity is formed with a top inlet communicating with the slurry outlet, and the bottom of the expansion cavity is formed with a bottom slurry outlet.
[0019] The top inlet is connected to a one-way membrane sleeve, which restricts the solidified slurry from entering the expansion chamber unidirectionally from top to bottom. The solidified slurry in the outlet channel enters the expansion chamber through the one-way membrane sleeve, compressing and deforming the airbag layer, increasing the pressure of the solidified slurry in the expansion chamber, and increasing the spray speed of the solidified slurry in the expansion chamber toward the bottom outlet and the side outlet. The one-way membrane sleeve restricts the solidified slurry in the expansion chamber from flowing back to the outlet channel in the opposite direction.
[0020] Compared with existing technologies, the cage mixer provided by this invention, suitable for the construction of high-strength deep solidification mixing piles, uses a bottom drill bit to drill downwards while simultaneously spraying solidifying slurry outwards. The solidifying slurry is sprayed outwards into the surrounding soil through the slurry outlet. Multiple internal mixing blades and multiple lower mixing blades uniformly mix the solidifying slurry with the surrounding soil to form a fluidized solidified soil slurry. Multiple fixing rings guide the drilling direction. During this process, the fluidized solidified soil slurry slowly flows upwards under the action of the solidifying slurry continuously sprayed from the bottom. In the process of flowing upwards, larger soil particles are continuously cut and broken into smaller particles by the internal mixing blades and lower mixing blades, making the fluidized solidified soil slurry more uniformly mixed and resulting in a mixing pile with higher strength.
[0021] Meanwhile, to ensure better verticality during drilling, multiple retaining rings are installed on the mixing drill bit. These rings allow for better control of the drilling verticality during drilling or lifting, preventing pile tilting. Because the retaining rings are rotatably connected to the mixing shaft, they do not rotate with it. In other words, while the mixing shaft drives the internal and lower mixing blades to rotate, the outer retaining rings do not rotate accordingly. This effectively ensures verticality control of the mixing pile during drilling or lifting.
[0022] In this way, in foundation pit support engineering, construction mixing piles can replace plain concrete cast-in-place piles. The piles have high strength and avoid the problems of transportation costs for excavated soil and the high cost of replacing concrete materials with soil in the pile body. Attached Figure Description
[0023] Figure 1 This is a three-dimensional schematic diagram of a cage mixer suitable for the construction of high-strength deep-solidification mixing piles provided by the present invention.
[0024] Figure 2 This is a cross-sectional schematic diagram of the slurry outlet section and the recessed area provided by the present invention. Detailed Implementation
[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.
[0026] The implementation of the present invention will be described in detail below with reference to specific embodiments.
[0027] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.
[0028] Reference Figure 1-2 The image shown is a preferred embodiment of the present invention.
[0029] The present invention provides a cage mixer suitable for the construction of high-strength deep solidification mixing piles, used for mixing and drilling in soil. It includes a mixing shaft 100 driven by a power source, and a plurality of horizontally arranged fixing rings 110 are sleeved on the outer periphery of the mixing shaft 100. The plurality of fixing rings 110 are arranged at intervals along the axial direction of the mixing shaft 100. The plurality of fixing rings 110 are arranged coaxially vertically, and the mixing shaft 100 passes through the center position of the plurality of fixing rings 110. The mixing shaft 100 is rotatably connected to the plurality of fixing rings.
[0030] A cylindrical cavity 101 is formed by multiple fixed rings 110. The stirring shaft 100 has an inner section that passes through the cylindrical cavity 101 and a lower section that extends to the bottom of the cylindrical cavity 101. The inner section is provided with multiple inner stirring blades 102, which are arranged at intervals along the circumference and axial direction of the inner section and are located in the cylindrical cavity 101. The lower section is provided with multiple lower stirring blades 130, which are arranged at intervals along the circumference and axial direction of the lower section.
[0031] The bottom of the lower section is provided with multiple bottom drill teeth 141, and the mixing shaft 100 is provided with a slurry outlet 104. The bottom of the slurry outlet 104 forms a bottom slurry outlet, and the top of the slurry outlet 104 is connected to the slurry pump through a slurry pipe. When the mixing shaft 100 drills in the soil, the multiple bottom drill teeth 141 drill downward into the soil, the multiple internal mixing blades 102 and the multiple lower mixing blades 130 mix the soil, and the multiple fixing rings 110 guide the drilling direction of the mixing shaft 100.
[0032] The cage mixer provided above, suitable for the construction of high-strength deep-layer solidification mixing piles, uses bottom drill teeth 141 to drill downwards while simultaneously spraying solidification slurry outwards. The solidification slurry is sprayed outwards into the surrounding soil through the slurry outlet 104. Multiple internal mixing blades 102 and multiple lower mixing blades 130 uniformly mix the solidification slurry with the surrounding soil to form a fluidized solidified soil slurry. Multiple fixing rings 110 guide the drilling direction. During this process, the fluidized solidified soil slurry slowly flows upwards under the action of the solidification slurry continuously sprayed from the bottom. In the process of flowing upwards, larger soil particles are continuously cut and broken into smaller particles by the internal mixing blades 102 and the lower mixing blades 130, making the fluidized solidified soil slurry more uniformly mixed and resulting in a mixing pile with higher strength.
[0033] Meanwhile, to ensure better verticality during drilling, multiple fixing rings 110 are installed on the mixing drill bit. The function of these fixing rings 110 allows for better control of the drilling verticality during drilling or lifting, preventing pile tilting. Since the fixing rings 110 are rotatably connected to the mixing shaft 100, the fixing rings 110 do not rotate with the mixing shaft 100. That is, when the mixing shaft 100 drives the internal mixing blades 102 and the lower mixing blades 130 to rotate and mix, the multiple fixing rings 110 on the outer side do not rotate accordingly. This effectively ensures verticality control of the mixing pile during drilling or lifting.
[0034] The bottom outlet is located on the outer periphery of the bottom of the stirring shaft 100.
[0035] The bottom of the lower section is provided with multiple inclined bars 140, which are arranged around the lower section at intervals in the circumference. Multiple bottom drill teeth 141 protrude from the bottom of the inclined bars 140. This achieves stable drilling efficiency.
[0036] Specifically, the inner end of the inclined strip 140 is connected to the bottom of the lower section, and the outer end of the inclined strip 140 is inclined upward away from the lower section. In this way, it is pointed, which is conducive to drilling downward and ensures drilling efficiency.
[0037] In this embodiment, multiple bottom drill teeth 141 are arranged at intervals along the length of the inclined strip 140, and adjacent bottom drill teeth 141 are arranged in opposite directions and at an angle. In this way, multi-directional and multi-angle rock breaking is achieved.
[0038] Multiple longitudinally arranged connecting pieces 120 connect adjacent fixing rings 110. The connecting pieces 120 are spaced around the circumference of the fixing rings 110, and the two ends of the connecting pieces 120 are respectively fixedly connected to the outer periphery of the two fixing rings 110. There is a longitudinal gap between adjacent connecting pieces 120, and the cylindrical cavity 101 communicates with the outside through the longitudinal gap. In this way, the multiple fixing rings 110 are connected by connecting pieces 120 (thick steel plates) to ensure sufficient strength and rigidity.
[0039] The inner end of the internal mixing blade 102 is connected to the outer periphery of the inner section, and the outer end of the internal mixing blade 102 extends outward away from the inner section and has an internal gap with the inner sidewall of the fixing ring 110. Along the axial direction of the inner section, the internal mixing blade 102 is arranged at an angle. In this way, the internal gap avoids collision between the internal mixing blade 102 and the fixing ring 110. At the same time, the angled arrangement of the internal mixing blade 102 increases the mixing area, which promotes uniform mixing of the soil and the solidified slurry in the cylinder cavity 101.
[0040] Specifically, the adjacent internal mixing blades 102 are tilted in different directions. This increases the mixing area and promotes uniform mixing of the soil and solidified slurry in the cylinder 101.
[0041] In this embodiment, the bottom of the stirring shaft 100 has downward-facing sidewalls, and the downward-facing sidewalls are provided with multiple downward-facing drill teeth 131, which are arranged in a straight line. In this way, drilling and soil breaking are achieved through the downward-facing drill teeth 131.
[0042] The bottom of the lower section is concave upwards, forming a concave region 103 with a bottom opening; the slurry outlet 104 has a slurry outlet section located in the lower section, the lower part of the slurry outlet section is concave and expands outwards, forming an expansion cavity 105, the bottom of the expansion cavity 105 forms a bottom slurry outlet, and the bottom slurry outlet is located at the top of the concave region 103.
[0043] A horizontally arranged metal mesh 106 is provided in the middle of the recessed area 103, and the metal mesh 106 is located between the bottom slurry outlet and the bottom opening; multiple side slurry outlets 107 are provided on the outer periphery of the lower section, and the expansion cavity 105 is connected to the outside through the side slurry outlets 107. Along the direction from the inside to the outside of the expansion cavity 105, the side slurry outlets 107 are arranged upwards at an angle.
[0044] During the drilling process, the mixing shaft 100 injects solidified grout into the grout outlet section of the grout outlet 104, filling the expansion chamber 105. The solidified grout is then sprayed downwards through the bottom grout outlet, dispersed through the metal mesh 106, and then sprayed downwards into the soil. Conversely, the solidified grout is also sprayed upwards into the soil through the side grout outlets 107. This allows the solidified grout to be sprayed into the soil from multiple directions and angles from the mixing shaft 100, ensuring uniform mixing of the solidified grout with the surrounding soil and guaranteeing sufficient strength of the mixing pile.
[0045] The inner wall of the expansion cavity 105 is covered with an elastically deformable airbag layer 108, the top of the expansion cavity 105 forms a top inlet that communicates with the slurry outlet 104, and the bottom of the expansion cavity 105 forms a bottom slurry outlet.
[0046] A one-way membrane sleeve 109 is connected to the top inlet, which restricts the solidified grout from entering the expansion chamber 105 unidirectionally from top to bottom. The solidified grout in the outlet channel 104 enters the expansion chamber 105 through the one-way membrane sleeve 109, compressing and deforming the airbag layer 108, increasing the pressure of the solidified grout in the expansion chamber 105, and increasing the spray velocity of the solidified grout in the expansion chamber 105 toward the bottom outlet and the side outlet 107. The one-way membrane sleeve 109 restricts the solidified grout in the expansion chamber 105 from flowing back to the outlet channel 104. In this way, the solidified grout in the expansion chamber 105 is pressurized by the airbag layer 108, causing it to spray toward the bottom outlet and the side outlet 107, promoting uniform mixing between the soil and the solidified grout.
[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A cage mixer suitable for the construction of high-strength deep-solidification mixing piles, characterized in that, For drilling and mixing in soil, the device includes a mixing shaft driven by a power source, with multiple horizontally arranged fixing rings fitted around the outer circumference of the mixing shaft. The multiple fixing rings are spaced apart along the axial direction of the mixing shaft. The multiple fixing rings are arranged coaxially vertically. The mixing shaft passes through the center of the multiple fixing rings and is rotatably connected to the multiple fixing rings. A cylindrical cavity is formed by the plurality of fixed rings. The stirring shaft has an inner section that passes through the cylindrical cavity and a lower section that extends to the bottom of the cylindrical cavity. The inner section is provided with a plurality of inner stirring blades, which are arranged at intervals along the circumference and axial direction of the inner section and are located in the cylindrical cavity. The lower section is provided with a plurality of lower stirring blades, which are arranged at intervals along the circumference and axial direction of the lower section. The bottom of the lower section is provided with multiple bottom drill teeth, the mixing shaft is provided with a slurry outlet channel, the bottom of the slurry outlet channel forms a bottom slurry outlet, and the top of the slurry outlet channel is connected to the grouting pump through a grouting pipe; when the mixing shaft drills into the soil, the multiple bottom drill teeth drill downwards into the soil, the multiple internal mixing blades and the multiple lower mixing blades mix the soil, and the multiple fixing rings guide the drilling direction of the mixing shaft; The bottom slurry outlet is located on the outer periphery of the bottom of the stirring shaft; The bottom of the lower section is concave upwards, forming a concave area with a bottom opening; the slurry outlet has a slurry outlet section located in the lower section, the lower part of the slurry outlet section is concave and expands outwards to form an expansion cavity, the bottom of the expansion cavity forms the bottom slurry outlet, and the bottom slurry outlet is located at the top of the concave area. A horizontally arranged metal mesh is provided in the middle of the recessed area, and the metal mesh is located between the bottom slurry outlet and the bottom opening; multiple side slurry outlets are provided on the outer periphery of the lower section, and the expansion cavity is connected to the outside through the side slurry outlets. Along the direction from the inside to the outside of the expansion cavity, the side slurry outlets are arranged at an upward inclination. During the drilling process in the soil, the solidified slurry enters the slurry outlet section of the slurry outlet channel and fills the expansion cavity. The solidified slurry is sprayed downward through the bottom slurry outlet, dispersed through the metal mesh, and then sprayed downward into the soil. The solidified slurry is also sprayed upward into the soil through the side slurry outlet. The inner wall of the expansion cavity is covered with an elastically deformable airbag layer, the top of the expansion cavity has a top inlet communicating with the slurry outlet, and the bottom of the expansion cavity has a bottom slurry outlet. The top inlet is connected to a one-way membrane sleeve, which restricts the solidified slurry from entering the expansion chamber unidirectionally from top to bottom. The solidified slurry in the outlet channel enters the expansion chamber through the one-way membrane sleeve, compressing and deforming the airbag layer, increasing the pressure of the solidified slurry in the expansion chamber, and increasing the spray speed of the solidified slurry in the expansion chamber toward the bottom outlet and the side outlet. The one-way membrane sleeve restricts the solidified slurry in the expansion chamber from flowing back to the outlet channel in the opposite direction.
2. The cage mixer for high-strength deep-solidification mixing pile construction as described in claim 1, characterized in that, The bottom of the lower section is provided with multiple inclined strips, which are arranged around the lower section at intervals in the circumference, and multiple bottom drill teeth are protruding from the bottom of the inclined strips.
3. The cage mixer for high-strength deep-solidification mixing pile construction as described in claim 2, characterized in that, The inner end of the inclined strip is connected to the bottom of the lower section, and the outer end of the inclined strip is arranged inclined upward away from the lower section.
4. The cage mixer for high-strength deep-solidification mixing pile construction as described in claim 3, characterized in that, Multiple bottom drill teeth are arranged at intervals along the length of the inclined strip, and adjacent bottom drill teeth are arranged in a staggered, opposite-south orientation.
5. The cage mixer for high-strength deep-solidification mixing pile construction as described in claim 1, characterized in that, Multiple longitudinally arranged connecting pieces are connected between adjacent fixed rings. The multiple connecting pieces are spaced around the fixed rings circumferentially. The two ends of the connecting pieces are respectively fixedly connected to the outer periphery of the two fixed rings. There is a longitudinal gap between adjacent connecting pieces. The cylinder cavity is connected to the outside through the longitudinal gap.
6. The cage mixer for high-strength deep-solidification mixing pile construction as described in claim 1, characterized in that, The inner end of the internal stirring blade is connected to the outer periphery of the inner section, the outer end of the internal stirring blade extends outward away from the inner section, and there is an internal gap between it and the inner sidewall of the fixing ring. Along the axial direction of the inner section, the internal stirring blade is arranged at an angle.
7. The cage mixer for high-strength deep-solidification mixing pile construction as described in claim 6, characterized in that, The adjacent internal stirring blades have different tilt directions.
8. The cage mixer for high-strength deep-solidification mixing pile construction as described in claim 1, characterized in that, The bottom of the stirring shaft has a downward-facing sidewall, and the downward-facing sidewall is provided with a plurality of downward-facing drill teeth, and the plurality of downward-facing sidewalls are arranged in a straight line.