Drill bit structure of cement-soil jet grouting mixing pile for water stop

Abstract

The utility model provides a drill bit structure of cement soil rotary jet mixing pile mainly used for water stop, belongs to the field of geotechnical engineering, including power device, drill rod, connecting sleeve, elastic drill fin, fastener and drill bit tip, be equipped with the slurry outlet on the drill rod, be equipped with elastic drill fin respectively in the slurry outlet upper portion and lower part, be equipped with drill bit tip in the drill rod bottom portion. The utility model reasonably arranges spare and part structure, and elastic drill fin can bend along the rotation direction when rotating contact support pile, and will not cause damage to it when touching support pile body, especially to the soil body between the irregular support pile of net distance arrangement is stripped, mixed and mixed into solidifying agent by the elastic drill fin of rotation, and forms the solidified soil with certain strength on the reinforced support pile side, and the soil between the support pile is replaced and solidified, thereby plays the role of water stop and reinforcement, makes the water and soil reinforcement range properly and wall body, irregular wall column or underground structure body etc. Close adhesion.

Description

Technical Field

[0001] This utility model belongs to the field of geotechnical engineering and can make the soil and water reinforcement range fit closely with walls, irregular columns or underground structures. Background Technology

[0002] Jet grouting piles utilize a high-pressure pump to deliver cement grout (single-pipe method), mixed grout and air (double-pipe method), or air, water, and grout (triple-pipe method) through a jetting pipe to a nozzle. As the jetting pipe is continuously raised, it mixes with soil particles to form a columnar cement-reinforced body of a certain diameter. In engineering, it is often used as a water-stopping structure for underground walls, irregular columns, or underground structures near groundwater levels. However, due to the increasing water and soil pressure and soil density with depth, the reinforced soil formed solely by high-pressure air, water, and grout jetting is difficult to achieve a tight bond with walls, irregular columns, or underground structures.

[0003] Therefore, it is necessary to innovate a method that can ensure the soil and water reinforcement area is properly and closely attached to walls, irregular columns, or underground structures. Utility Model Content

[0004] To address the problems in the prior art, this utility model proposes a drill bit structure for cement-soil jet grouting and mixing piles used for water stopping, which ensures that the water and soil reinforcement area is properly and closely fitted with walls, irregular columns, or underground structures.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a drill rod and a connecting sleeve are welded and fixed. The drill rod is provided with a grout outlet and a drill tip at the bottom. At least two coaxially arranged elastic drill wings are provided on the drill rod. The width of the upper elastic drill wing is greater than the width of the lower elastic drill wing. At least one elastic drill wing is provided between the grout outlet and the drill tip, and the width is equivalent to the designed net distance between the support piles. The elastic drill fins are screwed into the spacing between the support piles and bend along the direction of rotation. The width of the elastic drill fins above the grout outlet is greater than the designed net distance between the support piles. It also includes a connecting rod, which is fixed together with the connecting sleeve, and the elastic drill blade is detachably fixed to the connecting rod by fasteners.

[0006] Furthermore, a power device is installed at the top of the drill pipe, which can be an electric device or a hydraulic drive device.

[0007] Furthermore, the blade width of the elastic drill fin is placed vertically and perpendicular to the axis of the drill rod. When there are multiple elastic drill fins, they are evenly distributed alternately between adjacent upper and lower elastic drill fins, and the elastic drill fins on the same connecting sleeve are symmetrically distributed along the axis of the connecting sleeve.

[0008] Furthermore, the width of the elastic drill fin increases in a stepped manner from bottom to top.

[0009] Furthermore, the connecting rods are placed vertically along the width direction, perpendicular to the axis of the drill rod, and there are two of them, symmetrically distributed along the axis of the connecting sleeve.

[0010] Furthermore, the fastener is a detachable component, and the number of fasteners is at least one; when multiple fasteners are present, they are arranged linearly along the axial direction of the connecting rod.

[0011] Furthermore, the elastic drill fin located above the grout outlet has a width and length exceeding the spacing between the support piles, which is less than 2 / 3 of the length of the outer edge of the elastic drill fin extending beyond the end face of the connecting rod.

[0012] Furthermore, the drill tip is an inlaid alloy, and there is only one of it, which has a spiral conical or conical structure.

[0013] Furthermore, the material of the elastic drill fin is an elastic material with good bending resistance and a certain stiffness, and the elastic modulus is not less than 190 GPa.

[0014] Compared with the prior art, the advantages and beneficial effects of this utility model are as follows.

[0015] 1. This utility model features short drill wings near the drill bit tip, facilitating soil breaking and initial sweeping of the soil between support piles. Elastic drill wings near the drill bit tip prevent the drill bit and its connecting rod from contacting the support piles and causing jamming. The upper elastic drill wings gradually increase in width, facilitating thorough stripping, sweeping, and mixing of the soil between support piles. The elastic drill wings can bend upon contact with the support piles without causing damage, making it particularly effective for stripping, mixing, and solidifying soil between support piles with irregular spacing. After the agent is applied, a uniform reinforced soil with a certain strength is formed, which plays a role in water stoppage and reinforcement of the soil between the support piles. This ensures that the water and soil reinforcement area is properly and tightly bonded to the wall, irregular wall column or underground structure. The elastic drill blades are distributed above and below the grout outlet, allowing the cement grout to be transported along the gap between the elastic drill blades and the soil to the surrounding area of ​​the wall, irregular wall column or underground structure, and mixed with the soil to form cement soil. The reinforced soil wraps around the wall, irregular wall column or underground structure, thereby achieving the purpose of water stoppage.

[0016] 2. The elastic drill fin material of this utility model is made of an elastic material with good bending resistance and a certain rigidity. It can be a steel plate, steel wire bundle, chemical fiber material, etc. with good elasticity. The elastic modulus is not less than 190GPa. When the elastic drill fin extends into the spacing of the support piles as the drill rod rotates, it can bend along the direction of rotation. This effectively solves the problem that it is difficult for the reinforced soil to fit tightly with the wall, irregular wall column or underground structure. When encountering concrete structure, or when there is difficulty in stirring or water leakage, the flexibility can be appropriately increased, making it more widely applicable, especially when there are obstacles.

[0017] 3. The elastic drill wings of this utility model are distributed on the upper and lower parts of the grout outlet of the drill rod. The upper and lower adjacent elastic drill wings are evenly distributed in an alternating manner. The elastic drill wings on the same connecting sleeve are symmetrically distributed along the axis of the connecting sleeve, which can make the cement grout evenly transported to the wall or irregular wall column around the gap between the drill wing and the soil.

[0018] 4. The width of the elastic drill fin at the lower part of the slurry outlet of this utility model is shorter than that at the upper part, and it increases in a step-like manner from bottom to top, which makes it easier to open the soil and form a hole, and smoothly transition to the designed reinforced width, reducing the resistance during the drilling process.

[0019] 5. The connecting sleeve and the drill rod of this utility model are fixed together by welding, which makes the installation firm and easy to process and assemble.

[0020] 6. The connecting rod and connecting sleeve of this utility model can be fixed together by means of integral, welding or threaded connection, etc., which can save material costs to the maximum extent and facilitate machining and assembly.

[0021] 7. The elastic drill fin and the connecting rod of this utility model are fixed together by fasteners, which can be easily disassembled and replaced, saving material and time costs, and making machining and assembly easy. Attached Figure Description

[0022] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings: Figure 1 This is a schematic diagram of the drill bit structure for the cement-soil jet grouting and mixing pile used for water stopping according to this utility model. Figure 2 This is a schematic diagram illustrating the working principle of the drill bit structure for the cement-soil jet grouting and mixing pile used for water stopping, as described in this utility model. Figure 3 This is an assembly diagram of the elastic drill fin of this utility model; Figure 4 yes Figure 3A-direction view.

[0023] Explanation of reference numerals in the attached figures: 1. Drill rod; 2. Flexible drill fin; 11. Grout outlet; 3. Connecting rod; 4. Connecting sleeve; 5. Fastener; 12. Drill tip; 6. Power unit; 41. Positioning blind hole; 31. Mounting slot; 7. Support pile; 21. Semicircle. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0025] In the description of this utility model, it should be understood that "support pile" is also called support wall, and the technical terms "upper part," "lower part," "upper end," "lower end," "inner," "outer," "vertical," "concentric," "above," and "vertical" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only for the convenience of describing this utility model and for 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, they should not be construed as limitations on this utility model. In the description of this utility model, unless otherwise stated, "multiple" means two or more.

[0026] Words such as "include" or "contain" mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, without excluding other elements or objects. Words such as "connect" or "fix" are not limited to a single connection or fixing method, but can include multiple connection or fixing methods, such as screw fastening, threaded connection, welding, etc.

[0027] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0028] This utility model relates to a drill bit structure for a cement-soil jet grouting mixing pile used for water stoppage, comprising: a drill rod 1; elastic drill fins 2; a grout outlet 11; a connecting rod 3; a connecting sleeve 4; a fastener 5; a drill bit tip 12; a power unit 6; a positioning blind hole 41; an installation slot 31; a support pile 7; and a semicircle 21.

[0029] The drill rod 1 is welded and fixed to the connecting sleeve 4. The connecting rod 3 and the connecting sleeve 4 can be fixed together by means of integral, welding, or threaded connection. The flexible drill fin 2 is fixed to the connecting rod 3 with fasteners 5. During operation, the flexible drill fin 2 rotates and extends into the support pile 7, and the flexible drill fin 2 bends in the direction of rotation.

[0030] Preferably, the width of the elastic drill fin at the lower part of the grout outlet is shorter than that at the upper part of the grout outlet. The width of the elastic drill fin increases in a stepped manner from top to bottom, which facilitates soil opening and hole formation, and allows for a smooth transition to the designed reinforcement width, reducing resistance during drilling. This allows the cement grout to be evenly delivered to the wall or irregular wall column area along the gap between the drill fin and the soil.

[0031] Preferably, the number of elastic drill wings at the top and bottom of the slurry outlet 11 is arranged to adapt to the excavation of soil and the uniform mixing of curing agent. The number of upper drill wings is generally greater than that of lower drill wings to increase the cutting strength of the drill bit. The harder the soil, the greater the resistance to the uniform mixing of curing agent. The more elastic drill wings there are, the more they are evenly distributed. The upper and lower adjacent elastic drill wings are staggered and evenly distributed. The elastic drill wings on the same connecting sleeve are symmetrically distributed along the axis of the connecting sleeve.

[0032] Preferably, the elastic drill wing above the slurry outlet serves as the main blade for forming the designed reinforcement width during mixing. The width formed by its rotation is greater than the designed net distance S between the support piles 7. Because the soil hardness varies, the diameter of the outer edge trajectory swept out by the drill wing during rotation is different. Therefore, the width of the elastic drill wing above the slurry outlet needs to be appropriately increased, and the number also needs to be increased. This includes increasing the number of drill wings at the same cross section and increasing the number of drill wings at different cross sections. The specific width and number are determined according to the designed net distance S between the support piles 7 and the soil conditions. The larger the designed net distance S between the support piles 7, the longer the length, and the harder the soil, the more elastic drill wings there are, and the width increases stepwise from bottom to top.

[0033] Preferably, the elastic drill fins below the slurry outlet are short blades, positioned between the slurry outlet and the drill tip 12. Since the lower drill fins of the slurry outlet are the first to contact and excavate the soil, the resistance is relatively large. Therefore, the width of the elastic drill fins below the slurry outlet is shortened to form a transition relationship with the upper elastic drill fins of the slurry outlet. The width of the lower drill fins should be close to the designed net distance S between the support piles 7. The number is selected according to the soil quality, so as to facilitate loosening the soil and mixing it evenly with the curing agent. The specific width and number are determined according to the designed net distance S between the support piles 7 and the soil conditions. The larger the designed net distance S between the support piles 7, the longer the length, and the harder the soil, the more elastic drill fins there are, and the width increases in a stepwise manner from bottom to top.

[0034] Preferably, the elastic drill fin 2 is made of an elastic material with good bending resistance and a certain rigidity, such as a steel plate, steel wire bundle, or chemical fiber material with good elasticity and an elastic modulus of not less than 190 GPa. The elastic drill fin 2 is inserted into the spacing of the support piles 7 along with the drill rod and can bend along the direction of rotation. When encountering concrete structures, or when there is difficulty in stirring or water leakage, the flexibility can be appropriately increased, making it more widely applicable, especially when there are obstacles. It effectively solves the problem that it is difficult for the reinforced soil to be tightly bonded to the wall, irregular wall column, or underground structure, and can peel off the soil from the surface of the wall, irregular wall column, or underground structure, so that the cement slurry can be transported along the gap between the elastic drill fin and the soil to the surrounding area of ​​the wall, irregular wall column, or underground structure, and mixed with the soil to form cement soil. The reinforced soil wraps around the wall, irregular wall column, or underground structure, thereby achieving the purpose of water stoppage.

[0035] Preferably, a power unit 6 is provided at the top of the drill rod 1 to provide sufficient power to the drill tip 12. When encountering a concrete structure, the drill bit can effectively penetrate the soil layer, thereby improving drilling efficiency and ensuring that the drill bit can work normally. The power unit 6 should be small in size, short in height, and have high strength and rigidity. This will make the equipment smaller in size, less affected by space, and have higher verticality accuracy, making the drill bit more stable, increasing the service life of the drill bit, ensuring drilling quality, improving construction efficiency, and reducing project risks. The power source for power unit 6 can be an electric device or a hydraulic device.

[0036] Preferably, the drill bit tip is made of inlaid alloy, which can improve the cutting strength of the drill bit and increase the rock breaking force. The drill bit tip has a spiral cone or cone structure, and there is only one. This structure is conducive to concentrated force and smooth drilling. It can also be used in conjunction with subsequent grouting and mixing functions to achieve effective mixing of cement and soil and water-stopping effect.

[0037] The drill bit structure for cement-soil jet grouting piles used for water sealing includes the following steps: 1) Connection structure design between drill pipe 1 and connecting sleeve 4: The connecting sleeve 4 is fitted onto the drill pipe 1, the two are coaxial, and are positioned by tooling. Welding is used to make the connection between the two firm.

[0038] 2) Connection structure design between connecting sleeve 4 and connecting rod 3: A positioning blind hole 41 is provided on the connecting sleeve 4. One end of the connecting rod 3 is inserted into the positioning blind hole 41, perpendicular to the axis of the connecting sleeve 4, and then welded to the connecting sleeve 4. This method has a firm connection, saves material costs, and is easy to implement in terms of machining and welding processes.

[0039] 3) Connection structure design of elastic drill fin 2: The middle part of the elastic drill fin 2 is made to match the outer circle of the connecting sleeve 4 and bent into a semi-circle 21. Two mounting slots 31 are machined on the connecting rod 3. The flexible drill fin 2 is positioned by bending the semicircle 21 and wraps around the connecting sleeve 4, fitting against the plane of the connecting rod 3. Then, fasteners 5, which are U-shaped buckles, are used to hold the flexible drill fin 2 and place it in the mounting slot 31 to fix the flexible drill fin 2. There are 4 fasteners 5 in total, arranged linearly along the axis of the connecting rod 3. This installation is firm and meets the requirements of the flexible drill fin as a vulnerable part, which is easy to replace and disassemble, effectively saving material and time costs.

[0040] 4) Design of the elastic drill wing 2: The width of the elastic drill wing is shorter at the bottom than at the top, and increases in a stepped manner from bottom to top, which makes it easier to open the soil and form holes, and smoothly transitions to the designed reinforced width, reducing resistance during drilling. Based on the designed net distance S=600mm between the support piles 7 and the soil conditions, three sets of elastic drill wings are set on the upper part of the grout outlet 11 of drill rod 1. The widths from bottom to top are φ650mm, φ700mm, and φ750mm respectively. The outer edge of the uppermost elastic drill wing 2 extends 225mm beyond the end face of the connecting rod 3. The specifications of the connecting sleeve 4 and the connecting rod 3 are the same both at the top and bottom. This meets the requirement that the width length exceeding the spacing between the support piles is less than 2 / 3 of the length of the outer edge of the elastic drill wing extending beyond the end face of the connecting rod. The upper and lower adjacent elastic drill wings are evenly distributed at a 90° stagger. Between the lower part of the grout outlet and the drill bit tip 12, an elastic drill wing with a width of φ600mm is set to meet the requirement that the width is not greater than the net distance S designed between the support piles 7. The upper and lower adjacent elastic drill wings are evenly distributed at 90° staggered. Made of elastic material with good bending resistance and certain rigidity, Q235 steel plate with good elasticity is selected here. Its elastic modulus is 210 GPa and yield strength is 235MPa, which meets the requirement that the elastic modulus is not less than 190GPa. The elastic drill fin 2 is inserted into the spacing of the support pile 7 along with the drill rod. It can bend along the direction of rotation. When encountering concrete structures, or when there is difficulty in stirring or water leakage, the flexibility can be appropriately increased. It is especially suitable for situations with obstacles. It effectively solves the problem that it is difficult for the reinforced soil to be tightly attached to the wall. It can also peel off the soil on the surface of the wall, so that the cement slurry can be transported to the surrounding wall along the gap between the elastic drill fin and the soil, and mixed with the soil to form cement soil. The reinforced soil wraps around the wall, thereby achieving the purpose of water stoppage.

[0041] 5) Design of the power unit 6 at the top of drill rod 1: The power unit 6 is selected to be small in size, short in height, and high in strength and rigidity to ensure drilling quality, improve construction efficiency, reduce engineering risks, and extend the service life of drill bit. It can be an electric device or a hydraulic device. Here, an electric device - servo motor is selected.

[0042] 6) Design of drill tip 12: Drill tip 12 is made of inlaid alloy, which can improve the cutting strength of the drill bit and increase the rock breaking force. The drill tip is a spiral cone or cone structure, and there is only one. This structure is conducive to concentrated force and smooth drilling. It can also be used in conjunction with subsequent grouting and mixing functions to achieve effective mixing of cement and soil and water-stopping effect.

[0043] The above description is only one embodiment of the present utility model, but the content is only a preferred embodiment of the present utility model and should not be considered as limiting the scope of the present utility model. All equivalent changes and improvements made in accordance with the claims of the present utility model should still fall within the patent coverage of the present utility model.

Claims

1. A drill bit structure for a cement-soil jet grouting mixing pile for water stop, characterized by: The system includes a welded and fixed drill rod and a connecting sleeve. The drill rod is provided with a grout outlet and a drill tip at the bottom. The drill rod is provided with at least two coaxially arranged elastic drill wings. The width of the upper elastic drill wing is greater than the width of the lower elastic drill wing. There is at least one elastic drill wing between the grout outlet and the drill tip, and the width is equivalent to the designed net distance between the support piles. The elastic drill fins are screwed into the spacing between the support piles and bend along the direction of rotation. The width of the elastic drill fins above the grout outlet is greater than the designed net distance between the support piles. It also includes a connecting rod, which is fixed together with the connecting sleeve, and the elastic drill blade is detachably fixed to the connecting rod by fasteners.

2. The drill bit structure of the cement-soil churned mixing pile for water stop according to claim 1, characterized in that: The top of the drill pipe is equipped with a power unit, which can be an electric or hydraulic drive.

3. The drill bit structure of the cement-soil jet-mixed pile for water stop according to claim 1, characterized in that: The cutter wings of the elastic drill fins are placed vertically in the width direction, perpendicular to the axis of the drill rod. When there are multiple elastic drill wings, they are evenly distributed between adjacent elastic drill wings, and the elastic drill wings on the same connecting sleeve are symmetrically distributed along the axis of the connecting sleeve.

4. The drill bit structure for the cement-soil jet-mixed pile for water stop according to claim 1, characterized in that: The width of the flexible drill fin increases in a stepped manner from bottom to top.

5. The drill bit structure of the cement-soil jet-mixed pile for water stop according to claim 1, characterized in that: The connecting rods are placed vertically along the width direction, perpendicular to the axis of the drill pipe, and there are two of them, symmetrically distributed along the axis of the connecting sleeve.

6. The drill bit structure for cement-soil jet grouting mixing piles for waterstops according to claim 1, characterized in that: Fasteners are detachable components, and the number of fasteners is at least one. When multiple fasteners are present, they are arranged linearly along the axial direction of the connecting rod.

7. The drill bit structure for cement-soil jet grouting mixing piles for waterstops according to claim 1, characterized in that: The elastic drill fin located above the grout outlet has a width and length exceeding the spacing between the support piles, but is less than 2 / 3 of the length of the outer edge of the elastic drill fin extending beyond the end face of the connecting rod.

8. The drill bit structure for cement-soil jet grouting mixing piles for waterstops according to claim 1, characterized in that: The drill tip is made of inlaid alloy, and there is only one tip. It has a spiral conical or conical structure.

9. The drill bit structure for cement-soil jet grouting mixing piles for waterstops according to claim 1, characterized in that: The elastic modulus of the elastic drill fin is not less than 190 GPa.

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