An automatic variable diameter cement mixing device and its construction method

Abstract

This invention relates to an automatically variable-diameter cement mixing device and its construction method, belonging to the technical field of soft soil foundation treatment engineering. It solves the problem that existing fixed-radius devices cannot adjust the reinforcement radius according to the softness of the stratum, thus failing to improve the targeting and effectiveness of reinforcement. This invention provides an automatically variable-diameter cement mixing device, including an outer pipe, an inner pipe, a first motion unit, and a second motion unit. The first and second motion units of this invention automatically change diameter according to the stratum characteristics, requiring no external drive device and employing a purely mechanical structure, thus reducing the cost of equipment use and maintenance.

Description

Technical Field

[0001] This invention relates to the field of soft soil foundation treatment technology, and in particular to an automatic variable diameter cement mixing device and its construction method. Background Technology

[0002] Soft soil is a fine-grained soil with high natural water content, large natural porosity, low shear strength, and high compressibility. Under load, it is prone to slippage or excessive settlement deformation, posing a significant challenge to engineering construction. There are various methods for treating soft soil foundations, mainly including replacement, dynamic compaction, drainage consolidation, and composite foundation methods. Among these, cement-mixing piles in composite foundation methods have advantages over other methods, such as fast construction, low cost, minimal vibration, and good treatment results, and are therefore widely used.

[0003] However, due to the strong spatial variability in the lithology, thickness, and mechanical properties of strata, conventional cement mixing pile equipment uses constant diameter construction. The practice of using constant diameter cement mixing piles without considering the changes in strata is not very targeted and also leads to increased engineering construction costs. Summary of the Invention

[0004] Based on the above analysis, the present invention aims to provide an automatic variable diameter cement mixing device and its construction method to solve the problem that existing fixed radius devices cannot adjust the reinforcement radius according to the softness of the stratum, thus failing to improve the targeting and effect of reinforcement.

[0005] The present invention provides an automatic variable diameter cement mixing device, comprising an outer pipe, an inner pipe, a first motion unit, and a second motion unit;

[0006] The outer tube is sleeved outside the inner tube, and the outer tube rotates in the opposite direction while being sleeved on the inner tube;

[0007] The first motion unit is fixedly connected to the outer tube, and the outer tube drives the first motion unit to rotate in the same direction;

[0008] The second motion unit is fixedly connected to the inner tube, and the inner tube drives the second motion unit to rotate in the same direction;

[0009] The first and second motion units can automatically change diameter according to the geological characteristics when rotating.

[0010] Optionally, the first motion unit includes a first fixed blade and a second fixed blade, with one end of the first fixed blade and the second fixed blade respectively vertically fixedly installed on opposite sides of the outer tube.

[0011] Optionally, the first motion unit may further include a first movable blade and a second movable blade.

[0012] Optionally, the first motion unit may further include a first elastic rod and a second elastic rod.

[0013] Optionally, the first elastic rod connects the first fixed blade and the first movable blade;

[0014] The second fixed blade connects the second fixed blade to the second movable blade.

[0015] Optionally, the second motion unit includes a third fixed blade and a fourth fixed blade, with one end of the third fixed blade and the fourth fixed blade respectively vertically fixed on opposite sides of the inner tube.

[0016] Optionally, the second motion unit further includes a fifth movable blade and a sixth movable blade.

[0017] Optionally, the second motion unit further includes a fifth spring rod and a sixth spring rod.

[0018] Optionally, the cement mixing device may also include a drill bit.

[0019] The present invention also provides a construction method for an automatically variable diameter cement mixing device, wherein the steps of using the above-mentioned automatically variable diameter cement mixing device include:

[0020] Step 1: Determine the formation cohesion to determine the stiffness coefficient and connection location of the elastic rod;

[0021] Step 2: Install the first motion unit onto the outer tube;

[0022] Step 3: Install the second motion unit onto the inner tube;

[0023] Step 4: Install the outer pipe, the inner pipe, and the drill bit as a whole, and then perform stirring and grouting.

[0024] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0025] 1. The first and second motion units designed in this invention automatically change diameter according to the geological characteristics, without the need for an external drive device. They adopt a purely mechanical adaptive adjustment structure, which reduces the cost of using and maintaining the equipment.

[0026] 2. The cement mixing device designed in this invention is simple to operate, efficient and convenient.

[0027] 3. The cement mixing device designed in this invention can be designed with multiple movable blades and elastic rods according to actual needs.

[0028] 4. The present invention provides multiple spray nozzles on the first fixed blade, the second fixed blade, the third fixed blade and the fourth fixed blade, which can accelerate the spraying process and save construction time.

[0029] 5. The first, second, fifth, and sixth elastic rods designed in this invention can select stiffness coefficients based on the cohesion of the soft soil, and select connection positions with the first, second, third, and fourth fixed blades based on the stiffness coefficients, thereby extending the service life of the first, second, fifth, and sixth elastic rods.

[0030] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained from what is particularly pointed out in the description and drawings. Attached Figure Description

[0031] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0032] Figure 1 This is a schematic diagram of the cement mixing device in a mixing state according to an embodiment of the present invention;

[0033] Figure 2 for Figure 1 A top-view structural diagram;

[0034] Figure 3 This is a schematic diagram of a cement mixing device according to another embodiment of the present invention;

[0035] Figure 4 This is a schematic diagram of the cement mixing device of one embodiment of the present invention with the mixing radius at its maximum.

[0036] Figure label:

[0037] 1-Outer tube; 2-Inner tube; 3-First moving unit; 31-First fixed blade; 32-First movable blade; 33-First elastic rod; 34-Second fixed blade; 35-Second movable blade; 36-Second elastic rod; 37-Third movable blade; 38-Fourth movable blade; 4-Second moving unit; 41-Third fixed blade; 42-Fifth movable blade; 43-Fifth elastic rod; 44-Fourth fixed blade; 45-Sixth movable blade; 46-Sixth elastic rod; 47-Seventh movable blade; 48-Eighth movable blade; 5-Drill bit; 6-First grout nozzle. Detailed Implementation

[0038] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0039] In the description of this invention, it should be noted that the term "inward rotation" refers to the rotation of the movable blade towards the drill pipe, and "outward rotation" refers to the rotation of the movable blade away from the drill pipe. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Additionally, the term "elastic rod" refers to a device capable of compression and providing feedback force.

[0040] Example 1

[0041] A specific embodiment of the present invention, such as Figures 1 to 4 As shown, this invention discloses an automatic diameter-changing cement mixing device, including an outer pipe 1, an inner pipe 2, a first motion unit 3, and a second motion unit 4. The outer pipe 1 is sleeved outside the inner pipe 2, and the outer pipe 1 and the inner pipe 2 rotate in opposite directions. The first motion unit 3 is fixedly connected to the outer pipe 1, and the outer pipe 1 drives the first motion unit 3 to rotate in the same direction. The second motion unit 4 is fixedly connected to the inner pipe 2, and the inner pipe 2 drives the second motion unit 4 to rotate in the same direction. The first motion unit 3 and the second motion unit 4 can automatically change diameter according to the geological characteristics when rotating.

[0042] In this embodiment, when the outer tube 1 and the inner tube 2 rotate in opposite directions, when the first moving unit 3 and the second moving unit 4 encounter hard formations, they rotate inwards, reducing their stirring diameter; when they encounter soft formations, they rotate outwards, increasing their stirring diameter. This process is simple, efficient, and convenient. The first moving unit 3 and the second moving unit 4 automatically change diameter according to formation characteristics, requiring no external drive device. The purely mechanical adaptive adjustment structure reduces the equipment's usage and maintenance costs.

[0043] The first motion unit 3 includes a first fixed blade 31 and a second fixed blade 34. One end of the first fixed blade 31 and the second fixed blade 34 are respectively vertically fixed on opposite sides of the outer tube 1. The first fixed blade 31 and the second fixed blade 34 are on the same horizontal plane and are horizontal to the ground.

[0044] The first motion unit 3 also includes a first movable blade 32 and a second movable blade 35. One end of the first movable blade 32 is movably connected to the other end of the first fixed blade 34, and one end of the second movable blade 35 is movably connected to the other end of the second fixed blade 34. Preferably, the connection is a hinge. The first fixed blade 31 can drive the first movable blade 32 to rotate in the same direction, and the second fixed blade 34 can drive the second movable blade 35 to rotate in the same direction.

[0045] The first motion unit 3 also includes a first elastic rod 33 and a second elastic rod 36. The two ends of the first elastic rod 33 are respectively connected to the first fixed blade 31 and the first movable blade 32; the two ends of the second elastic rod 36 are respectively connected to the second fixed blade 34 and the second movable blade 35.

[0046] Specifically, both the first elastic rod 33 and the second elastic rod 36 are telescopic. The first elastic rod 33 exerts an outward pushing force on the first movable blade 32, and similarly, the second elastic rod 36 exerts an outward pushing force on the second movable blade 35.

[0047] In this embodiment, when the first movable blade 32 encounters a hard stratum, it experiences significant resistance. At this time, the pushing force of the first elastic rod 33 is less than the resistance exerted by the stratum on the first movable blade 32, causing the first movable blade 32 to compress the first elastic rod 33 inward, thus reducing the stirring radius of the first motion unit 3. When the first movable blade 32 encounters a soft stratum, it experiences less resistance. At this time, the pushing force of the first elastic rod 33 is greater than the resistance exerted by the stratum on the first movable blade 32, causing the first elastic rod 33 to automatically extend, pushing the first movable blade 32 outward. The second movable blade 35 and the second elastic rod 36 are adjusted in the same manner. Therefore, the first elastic rod 33 and the second elastic rod 36 automatically extend and retract according to the resistance exerted on the first movable blade 32 and the second movable blade 35 based on the hardness of the stratum, thereby adjusting the stirring radius of the first motion unit 3.

[0048] Furthermore, the first motion unit 3 also includes a third movable blade 37 and a fourth movable blade 38. One end of the third movable blade 37 is movably connected to one end of the first movable blade 32, and one end of the fourth movable blade 38 is movably connected to one end of the second movable blade 35. The specific connection method is hinged.

[0049] The first motion unit 3 also includes a third elastic rod and a fourth elastic rod. The third elastic rod connects the third movable blade 37 and the first movable blade 32; the fourth elastic rod connects the fourth movable blade 38 and the second movable blade 35.

[0050] It should be noted that when the third movable blade 37 encounters a hard stratum, it experiences significant resistance. In this case, the pushing force of the third elastic rod is less than the resistance exerted by the stratum on the third movable blade 37, causing the third movable blade 37 to compress the third elastic rod inward, thus reducing the stirring radius of the first motion unit 3. Conversely, when the third movable blade 37 encounters a soft stratum, it experiences less resistance. In this case, the pushing force of the third elastic rod is greater than the resistance exerted by the stratum on the third movable blade 37, causing the third elastic rod to automatically extend, pushing the third movable blade 37 outward, thus increasing the stirring radius of the first motion unit 3. Similarly, the fourth movable blade 38 and the fourth elastic rod are adjusted in the same manner.

[0051] Specifically, the first elastic rod 33 and the third elastic rod are located on the side where the first fixed blade 31, the first movable blade 32 and the third movable blade 37 rotate in opposite directions; the second elastic rod 36 and the fourth elastic rod are located on the side where the second fixed blade 34, the second movable blade 35 and the fourth movable blade 38 rotate in opposite directions.

[0052] The second motion unit 4 includes a third fixed blade 41 and a fourth fixed blade 44. One end of the third fixed blade 41 and the fourth fixed blade 44 are respectively vertically fixed on opposite sides of the inner tube 2. The third fixed blade 41 and the fourth fixed blade 44 are both at a certain angle to the ground and are perpendicular to the inner tube 2, so as to facilitate the insertion of the third fixed blade 41 and the fourth fixed blade 44 into the soil. The extended surfaces of the third fixed blade 41 and the fourth fixed blade 44 intersect, thereby facilitating mixing from different angles and saving time.

[0053] The second motion unit 4 further includes a fifth movable blade 42 and a sixth movable blade 45. One end of the fifth movable blade 42 is movably connected to the other end of the third fixed blade 41, and one end of the sixth movable blade 45 is movably connected to the other end of the fourth fixed blade 44. Preferably, both connections are hinged. The fifth movable blade 42 and the third fixed blade 41 have the same tilt angle, and the third fixed blade 41 can drive the fifth movable blade 42 to rotate in the same direction. The sixth movable blade 45 and the fourth fixed blade 44 have the same tilt angle, and the fourth fixed blade 44 can drive the sixth movable blade 45 to rotate in the same direction.

[0054] The second motion unit 4 also includes a fifth elastic rod 43 and a sixth elastic rod 46. The two ends of the fifth elastic rod 43 are respectively connected to the third fixed blade 41 and the fifth movable blade 42; the two ends of the sixth elastic rod 46 are respectively connected to the fourth fixed blade 44 and the sixth movable blade 45.

[0055] Specifically, both the fifth elastic rod 43 and the sixth elastic rod 46 are telescopic. The fifth elastic rod 43 exerts an outward pushing force on the fifth movable blade 42, and similarly, the sixth elastic rod 46 exerts an outward pushing force on the sixth movable blade 45.

[0056] In this embodiment, when the fifth movable blade 42 encounters a hard stratum, it experiences significant resistance. At this time, the pushing force of the fifth elastic rod 43 is less than the resistance exerted by the stratum on the fifth movable blade 42, causing the fifth movable blade 42 to compress the fifth elastic rod 43 inward, thus reducing the stirring radius of the second motion unit 3. When the fifth movable blade 42 encounters a soft stratum, it experiences less resistance. At this time, the pushing force of the fifth elastic rod 43 is greater than the resistance exerted by the stratum on the fifth movable blade 42, causing the fifth elastic rod 43 to automatically extend, pushing the fifth movable blade 42 outward, thus increasing the stirring radius of the second motion unit 3. The sixth movable blade 45 and the sixth elastic rod 46 are adjusted in the same manner. Therefore, the fifth elastic rod 43 and the sixth elastic rod 46 automatically extend and retract according to the resistance exerted on the fifth movable blade 42 and the sixth movable blade 45 based on the hardness of the stratum, thereby adjusting the stirring radius of the second motion unit 4.

[0057] Furthermore, the second motion unit 4 also includes a seventh movable blade 47 and an eighth movable blade 48. One end of the seventh movable blade 47 is movably connected to one end of the fifth movable blade 42, and the seventh movable blade 47 and the fifth movable blade 42 have the same tilt angle. One end of the eighth movable blade is movably connected to one end of the sixth movable blade, and the eighth movable blade and the eighth movable blade have the same tilt angle. The specific connection method is hinged.

[0058] The second motion unit 4 also includes a seventh elastic rod and an eighth elastic rod. The seventh elastic rod connects the seventh movable blade 47 and the fifth movable blade 42; the eighth elastic rod connects the eighth movable blade 48 and the sixth movable blade 45; the seventh elastic rod and the fifth elastic rod 43 are installed on the same side, and the eighth elastic rod and the sixth elastic rod 46 are installed on the same side.

[0059] It should be noted that when the seventh movable blade 47 encounters a hard stratum, it experiences significant resistance. In this case, the pushing force of the seventh elastic rod is less than the resistance exerted by the stratum on the seventh movable blade 47, causing the seventh movable blade 47 to compress the seventh elastic rod inward, thus reducing the stirring radius of the second motion unit 4. Conversely, when the seventh movable blade 47 encounters a soft stratum, it experiences less resistance. In this case, the pushing force of the seventh elastic rod is greater than the resistance exerted by the stratum on the seventh movable blade 47, causing the seventh elastic rod to automatically extend, pushing the seventh movable blade 47 outward, thus increasing the stirring radius of the second motion unit 4. The eighth movable blade 48 and the eighth elastic rod are adjusted in the same way. Therefore, the seventh and eighth elastic rods automatically extend and retract according to the resistance exerted by the stratum on the seventh and eighth movable blades 47 and 48, respectively, thereby adjusting the stirring radius of the second motion unit 4. During this process, the seventh elastic rod and the fifth elastic rod 43, and the eighth elastic rod and the sixth elastic rod 46, simultaneously contract or extend.

[0060] Specifically, the fifth elastic rod 43 and the seventh elastic rod are located on the side opposite to the rotation direction of the third fixed blade 41, the fifth movable blade 42 and the seventh movable blade 47; the sixth elastic rod 46 and the eighth elastic rod are located on the side opposite to the rotation direction of the fourth fixed blade 44, the sixth movable blade 45 and the eighth movable blade 48.

[0061] Furthermore, when encountering softer strata, the cement mixing device may also include a balancing unit, which includes a first elastic band, a second elastic band, a third elastic band, and a fourth elastic band. The two ends of the first elastic band are fixedly installed on the outer pipe 1 and the first movable blade, respectively. The first elastic band is parallel to the first elastic rod 33 and is on the same horizontal plane. The two ends of the second elastic band are fixedly installed on the outer pipe and the second movable blade, respectively. The second elastic band is parallel to the second elastic rod 36 and is on the same horizontal plane. The two ends of the third elastic band are fixedly installed on the inner pipe and the fifth movable blade, respectively. The third elastic band is parallel to the fifth elastic rod 43 and is on the same horizontal plane. The two ends of the fourth elastic band are installed on the inner pipe and the sixth movable blade, respectively. The fourth elastic band is parallel to the sixth elastic rod 46 and is on the same horizontal plane.

[0062] When encountering soft strata, the pushing force of the first elastic rod 33, the second elastic rod 36, the fifth elastic rod 43, and the sixth elastic rod 46 is greater than the resistance of the strata, pushing the first movable blade 32, the second movable blade 35, the fifth movable blade 42, and the sixth movable blade 45 outward. At this time, the first elastic band, the second elastic band, the third elastic band, and the fourth elastic band pull the first movable blade 32, the second movable blade 35, the fifth movable blade 42, and the sixth movable blade 45 outward, ensuring that the first movable blade 32, the second movable blade 35, the fifth movable blade 42, and the sixth movable blade 45 are subjected to equal pushing and pulling forces. The first movable blade 32, the second movable blade 35, the fifth movable blade 42, and the sixth movable blade 45 are on the same horizontal line as the first fixed blade 31, the second fixed blade 34, the third fixed blade 41, and the fourth fixed blade 44, respectively. At this time, the stirring radius is at its maximum.

[0063] The cement mixing device also includes a drill bit 5, which is fixedly connected to the lower part of the inner tube 2. The drill bit 5 is conical, which can reduce the friction between the cement mixing device and the soil and facilitate the insertion of the cement mixing device into the soil.

[0064] The cement mixing device also includes a first grouting nozzle 6, which is located on the inner tube 2. Specifically, the position and number of the first grouting nozzle 6 are not limited and are determined according to the actual situation. Preferably, the first grouting nozzle is located on the upper part of the inner tube 2.

[0065] In this embodiment, the first spraying port 6 includes a front spraying port and a rear spraying port. The front spraying port and the rear spraying port are arranged on opposite sides of the inner tube 2, and the front spraying port and the rear spraying port pass through the central axis of the inner tube 2 and are on the same horizontal line, so as to facilitate the cement mixing device to spray grout evenly.

[0066] Example 2

[0067] The first fixed blade 31, the second fixed blade 34, the third fixed blade 41 and the fourth fixed blade 44 are all hollow structures.

[0068] The first fixed blade 31 and the second fixed blade 34 are respectively provided with multiple second and third spray nozzles on the side that is subjected to force when rotating.

[0069] Furthermore, the first fixed blade 31 includes a first side cover that mates with the second spray nozzle, one end of which is elastically connected to the second spray nozzle; the second fixed blade 34 includes a second side cover that mates with the third spray nozzle, one end of which is elastically connected to the third spray nozzle.

[0070] In this embodiment, when the first fixed blade 31 and the second fixed blade 34 rotate clockwise to stir, under the action of the stratum resistance, the first side cover and the second side cover respectively cover the second grouting nozzle and the third grouting nozzle to prevent soil from entering the interior of the first fixed blade 31 and the second fixed blade 34 through the second grouting nozzle and the third grouting nozzle respectively; when grouting is required, the grouting liquid is injected from the outer pipe 1 and then flows into the first fixed blade 31 and the second fixed blade 34. The grouting liquid applies an outward pushing force to the first side cover and the second side cover, and the first side cover and the second side cover open. The grouting liquid will flow out through the second grouting nozzle and the third grouting nozzle, which accelerates the grouting process and saves construction time.

[0071] The third fixed blade 41 and the fourth fixed blade 44 are respectively provided with multiple fourth and fifth spray nozzles on the side that is subjected to force when rotating.

[0072] Furthermore, the third fixed blade 41 includes a third side cover that mates with the fourth spray nozzle, one end of which is elastically connected to the fourth spray nozzle; the fourth fixed blade 44 includes a fourth side cover that mates with the fifth spray nozzle, one end of which is elastically connected to the fifth spray nozzle.

[0073] In this embodiment, when the third fixed blade 41 and the fourth fixed blade 44 rotate counterclockwise to stir, under the action of the stratum resistance, the third side cover and the fourth side cover respectively cover the fourth grouting nozzle and the fifth grouting nozzle to prevent soil from entering the interior of the third fixed blade 41 and the fourth fixed blade 44 through the fourth grouting nozzle and the fifth grouting nozzle respectively; when grouting is required, the grouting liquid is injected from the outer pipe 1, flows into the inner pipe 2, and then flows into the interior of the third fixed blade 41 and the fourth fixed blade 44. The grouting liquid applies an outward pushing force to the third side cover and the fourth side cover, and the third side cover and the fourth side cover open. The grouting liquid will flow out through the fourth grouting nozzle and the fifth grouting nozzle, which accelerates the grouting process and saves construction time.

[0074] Example 3

[0075] The first fixed blade 31, the second fixed blade 34, the third fixed blade 41, and the fourth fixed blade 44 are respectively provided with a first sliding groove, a second sliding groove, a third sliding groove, and a fourth sliding groove. Furthermore, the first sliding groove, the second sliding groove, the third sliding groove, and the fourth sliding groove are each provided with multiple limiting holes at various positions. The number of limiting holes is variable and is set according to actual needs.

[0076] In this embodiment, the first slide groove is provided with a first and a second limiting hole, the first limiting hole being closer to the outer tube than the second limiting hole; the second slide groove is provided with a third and a fourth limiting hole, the third limiting hole being closer to the outer tube than the fourth limiting hole; the third slide groove is provided with a fifth and a sixth limiting hole, the fifth limiting hole being closer to the inner tube than the sixth limiting hole; and the fourth slide groove is provided with a seventh and a eighth limiting hole, the seventh limiting hole being closer to the inner tube than the eighth limiting hole.

[0077] Specifically, when the cohesion of the soft soil is between 5-25 kPa (i.e., when the soil is relatively soft), the stiffness coefficients of the first elastic rod 33, the second elastic rod 36, the fifth elastic rod 43, and the sixth elastic rod 46 are selected to be 1500 N / m-7050 N / m. One end of the first elastic rod 33, the second elastic rod 36, the fifth elastic rod 43, and the sixth elastic rod 46, respectively, connects to the first fixed blade 31, the second fixed blade 34, the third fixed blade 41, and the fourth fixed blade 44, located at the second limiting hole, the fourth limiting hole, the sixth limiting hole, and the eighth limiting hole. When the cohesion of the soft soil is between 25-40 kPa (i.e., when the soil is relatively hard), the stiffness coefficients of the first elastic rod 33, the second elastic rod 36, the fifth elastic rod 43, and the sixth elastic rod 46 are selected to be 1500 N / m-7050 N / m. The stiffness coefficients of the second elastic rod 36, the fifth elastic rod 43, and the sixth elastic rod 46 are 7050 N / m to 12600 N / m. The first elastic rod 33, the second elastic rod 36, the fifth elastic rod 43, and the sixth elastic rod 46 are respectively connected to the first fixed blade 31, the second fixed blade 34, the third fixed blade 41, and the fourth fixed blade 44 at the first limiting hole, the third limiting hole, the fifth limiting hole, and the seventh limiting hole. As a result, the compression angle of the first elastic rod 33, the second elastic rod 36, the fifth elastic rod 43, and the sixth elastic rod 46 is reduced, which can extend the service life of the first elastic rod 33, the second elastic rod 36, the fifth elastic rod 43, and the sixth elastic rod 46.

[0078] Example 4

[0079] A construction method for an automatic variable diameter cement mixing device, comprising the following steps:

[0080] Step 1: Determine the formation cohesion to determine the elasticity coefficient and connection location of the elastic rod;

[0081] Step 2: Install the first motion unit 3 onto the outer tube 1 according to Embodiments 1, 2, and 3;

[0082] Step 3: Install the second motion unit 4 onto the inner tube 2;

[0083] Step 4: Install the outer pipe 1, inner pipe 2 and drill bit 5 as a whole, and then mix and grout.

[0084] Specifically, it includes:

[0085] In step 1, the cohesion of the formation is tested using a specialized device. Based on the cohesion, the stiffness coefficient and connection position of the elastic rods are determined. Specifically, when the cohesion of the soft soil is between 5-25 kPa (i.e., when the soil is relatively soft), the stiffness coefficients of the first elastic rod 33, the second elastic rod 36, the fifth elastic rod 43, and the sixth elastic rod 46 are selected to be between 1500 N / m and 7050 N / m. The first elastic rod 33, the second elastic rod 36, the fifth elastic rod 43, and the sixth elastic rod 46 are respectively connected to one end of the first fixed blade 31, the second fixed blade 34, the third fixed blade 41, and the fourth fixed blade 44. Located at the second, fourth, sixth, and eighth limiting holes; when the cohesion of the soft soil is between 25-40 kPa (i.e., when the soil is relatively hard), the stiffness coefficients of the first elastic rod 33, the second elastic rod 36, the fifth elastic rod 43, and the sixth elastic rod 46 are selected to be 7050 N / m-12600 N / m. One end of the first elastic rod 33, the second elastic rod 36, the fifth elastic rod 43, and the sixth elastic rod 46 is respectively connected to the first fixed blade 31, the second fixed blade 34, the third fixed blade 41, and the fourth fixed blade 44 at the first limiting hole, the third limiting hole, the fifth limiting hole, and the seventh limiting hole. In step 2, the first motion unit 3 is fixedly installed on the outer tube 1. Specifically, the first fixed blade 31 and the second fixed blade 34 are respectively vertically installed on opposite sides of the outer tube 1. Then, the first movable blade 32 is fixedly installed at one end of the first fixed blade 31, and the first elastic rod 33 is installed on the first fixed blade 31 and the first movable blade 32. The second movable blade 35 is installed at one end of the second fixed blade 34, and the second elastic rod 36 is installed on the second fixed blade 34 and the second movable blade 35.

[0086] In step 3, first spray nozzles 6 are set on opposite sides of the inner tube 2, third fixed blades 41 and fourth fixed blades 44 are installed on opposite sides of the inner tube 2, fifth movable blades 42 are installed at one end of the third fixed blades 41, and fifth elastic rods 43 are installed on the third fixed blades 41 and the fifth movable blades 42; sixth movable blades 45 are installed at one end of the fourth fixed blades 44, and sixth elastic rods 46 are installed on the fourth fixed blades 44 and the sixth movable blades 45.

[0087] In step 4, the inner tube 2 is installed inside the outer tube 1, ensuring that the outer tube 1 and the inner tube 2 can move in opposite directions. Then, the drill bit 5 is installed, and the cement mixing device can be used for mixing and grouting.

[0088] The beneficial effects of this invention are as follows:

[0089] 1. The cement mixing device designed in this invention can automatically change its diameter according to the geological characteristics, without the need for an external drive device. It adopts a purely mechanical structure, which reduces the cost of using and maintaining the equipment.

[0090] 2. The cement mixing device designed in this invention is simple to operate, efficient and convenient.

[0091] 3. The present invention provides multiple spray nozzles on the first fixed blade, the second fixed blade, the third fixed blade and the fourth fixed blade, which can accelerate the spraying process and save construction time.

[0092] 4. The first, second, fifth, and sixth elastic rods designed in this invention can select stiffness coefficients based on the cohesion of the soft soil, and select connection positions with the first, second, third, and fourth fixed blades based on the stiffness coefficients, thereby extending the service life of the first, second, fifth, and sixth elastic rods.

[0093] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. An automatic variable diameter cement mixing device, characterized in that, It includes an outer tube (1), an inner tube (2), a first moving unit (3), and a second moving unit (4); the outer tube (1) is sleeved on the outside of the inner tube (2), and the outer tube (1) rotates in the opposite direction to the inner tube (2); the first moving unit (3) is fixedly connected to the outer tube (1), and the outer tube (1) drives the first moving unit (3) to rotate in the same direction; the second moving unit (4) is fixedly connected to the inner tube (2), and the inner tube (2) drives the second moving unit (4) to rotate in the same direction; the first moving unit (3) and the second moving unit (4) can automatically change diameter according to the geological characteristics when rotating; The first motion unit (3) includes a first movable blade (32), a first elastic rod (33), a second movable blade (35), and a second elastic rod (36). Both the first elastic rod (33) and the second elastic rod (36) are telescopic. The first elastic rod (33) exerts an outward pushing force on the first movable blade (32), and the second elastic rod (36) exerts an outward pushing force on the second movable blade (35). The first elastic rod (33) and the second elastic rod (36) can automatically extend and retract according to the resistance applied to the first movable blade (32) and the second movable blade (35) based on the hardness of the stratum, thereby adjusting the stirring radius of the first motion unit (3). When the first movable blade (32) encounters a hard stratum, it experiences greater resistance from the stratum. At this time, the pushing force of the first elastic rod (33) is less than the resistance of the stratum to the first movable blade (32), and the first movable blade (32) compresses the first elastic rod (33) inward, thus reducing the stirring radius of the first motion unit (3). When the first movable blade (32) encounters a soft stratum, it experiences less resistance from the stratum. At this time, the pushing force of the first elastic rod (33) is greater than the resistance of the stratum to the first movable blade (32), and the first elastic rod (33) automatically extends, pushing the first movable blade (32) to open outward. The second movable blade (35) and the second elastic rod (36) are adjusted in the same way. The second motion unit (4) includes a fifth movable blade (42), a fifth elastic rod (43), a sixth movable blade (45), and a sixth elastic rod (46). The fifth elastic rod (43) and the sixth elastic rod (46) are both telescopic. The fifth elastic rod (43) exerts an outward pushing force on the fifth movable blade (42), and the sixth elastic rod (46) exerts an outward pushing force on the sixth movable blade (45). The fifth elastic rod (43) and the sixth elastic rod (46) can automatically extend and retract according to the resistance applied to the fifth movable blade (42) and the sixth movable blade (45) based on the hardness of the stratum, thereby adjusting the stirring radius of the second motion unit (4). When the fifth movable blade (42) encounters a hard stratum, it experiences greater resistance from the stratum. At this time, the pushing force of the fifth elastic rod (43) is less than the resistance of the stratum to the fifth movable blade (42), and the fifth movable blade (42) compresses the fifth elastic rod (43) inward, thus reducing the stirring radius of the second motion unit (4). When the fifth movable blade (42) encounters a soft stratum, it experiences less resistance from the stratum. At this time, the pushing force of the fifth elastic rod (43) is greater than the resistance of the stratum to the fifth movable blade (42), and the fifth elastic rod (43) automatically extends, pushing the fifth movable blade (42) to open outward, thus increasing the stirring radius of the second motion unit (4). The sixth movable blade (45) and the sixth elastic rod (46) are adjusted in the same way. The first motion unit (3) also includes a first fixed blade (31) and a second fixed blade (34); the second motion unit (4) also includes a third fixed blade (41) and a fourth fixed blade (44). The first fixed blade (31), the second fixed blade (34), the third fixed blade (41) and the fourth fixed blade (44) are all hollow structures; the first fixed blade (31) and the second fixed blade (34) are provided with multiple second and third grouting nozzles on the side subjected to force when rotating; the third fixed blade (41) and the fourth fixed blade (44) are provided with multiple fourth and fifth grouting nozzles on the side subjected to force when rotating. The first fixed blade (31) includes a first side cover that mates with the second grouting nozzle, one end of which is elastically connected to the second grouting nozzle; the second fixed blade (34) includes a second side cover that mates with the third grouting nozzle, one end of which is elastically connected to the third grouting nozzle; the third fixed blade (41) includes a third side cover that mates with the fourth grouting nozzle, one end of which is elastically connected to the fourth grouting nozzle; the fourth fixed blade (44) includes a fourth side cover that mates with the fifth grouting nozzle, one end of which is elastically connected to the fifth grouting nozzle.

2. The automatic diameter-changing cement mixing device according to claim 1, characterized in that, One end of the first fixed blade (31) and the second fixed blade (34) are respectively vertically fixed on opposite sides of the outer tube (1).

3. The automatic diameter-changing cement mixing device according to claim 2, characterized in that, The first elastic rod (33) connects the first fixed blade (31) and the first movable blade (32); the second elastic rod (36) connects the second fixed blade (34) and the second movable blade (35).

4. The automatic diameter-changing cement mixing device according to claim 1, characterized in that, One end of the third fixed blade (41) and the fourth fixed blade (44) are respectively vertically fixed on opposite sides of the inner tube (2).

5. The automatic diameter-changing cement mixing device according to claim 1, characterized in that, The cement mixing device also includes a drill bit (5).

6. A construction method for an automatic variable diameter cement mixing device, utilizing the automatic variable diameter cement mixing device according to any one of claims 1 to 5, characterized in that the steps include... include: Step 1: Determine the formation cohesion to determine the stiffness coefficient and connection location of the elastic rod; Step 2: Install the first motion unit (3) onto the outer tube (1); Step 3: Install the second motion unit (4) onto the inner tube (2); Step 4: Install the outer pipe (1), the inner pipe (2) and the drill bit (5) as a whole, and then mix and grout.

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