A multi-directional mixing drill bit for cement soil mixing pile

Abstract

The utility model discloses a multi-directional mixing drill bit for cement soil mixing piles in the field of foundation treatment technology, comprising a drill rod; a closed box; a rotating drill bit; a plurality of positioning frames; at least one three-dimensional mixing module, the three-dimensional mixing module comprising a first bevel gear; a plurality of mixing units, which correspond to the positioning frames one by one, the mixing unit comprising a driving shaft, a second bevel gear, and at least one mixing blade; at least one external excavation module, which is arranged at intervals up and down and is all located below the closed box, the external excavation module comprising a plurality of external excavation stirring blades, which are arranged horizontally and evenly surrounded by the outer periphery of the drill rod; the utility model can carry out three-dimensional mixing of the entire pile body, and its mixing is more thorough and uniform, and the shrinkage and slurry bubbling phenomena are avoided, and the drill rod has a small diameter, which effectively improves the problem that the pile body center cannot be mixed evenly due to the large drill rod diameter, so that no columnar voids will remain on the reinforced soil body after construction, which significantly improves the construction efficiency and the mixing effect.

Description

Technical Field

[0001] The utility model relates to the technical field of foundation treatment, in particular to a multi-directional mixing drill bit for a cement soil mixing pile. Background Art

[0002] There are many ways to deal with foundation seepage prevention, among which cement soil mixing pile anti-seepage wall technology has been widely used in recent years as an effective treatment technology. Cement soil mixing pile anti-seepage wall technology is a technology that uses a pile driver to force cement and soil to mix in situ, and then improves the strength and anti-seepage performance of the reinforced soil through a series of physical and chemical reactions between cement and soil. It has the advantages of high degree of mechanization, simple and fast construction, and can effectively improve the foundation's anti-seepage properties.

[0003] However, engineering practice has shown that the traditional cement-soil mixing pile anti-seepage wall construction process has problems such as incomplete and uneven mixing due to the single horizontal mixing method, which in turn leads to poor local anti-seepage performance of the wall, seriously restricting the application of cement-soil mixing pile anti-seepage wall. Utility Model Content

[0004] The utility model aims to provide a multi-directional mixing drill bit for cement soil mixing piles, which solves the technical problems of incomplete and uneven mixing in the prior art.

[0005] The utility model discloses a multi-directional mixing drill bit for cement soil mixing piles, comprising:

[0006] Drill pipe;

[0007] A closing box, rotatably sleeved on the drill rod;

[0008] A rotary drill bit is installed at the bottom of the drill rod;

[0009] A plurality of positioning frames are evenly mounted around the outer circumference of the closed box;

[0010] At least one three-dimensional stirring module is arranged at intervals up and down, and the three-dimensional stirring module includes

[0011] A first bevel gear is fixedly sleeved on the drill rod and is located inside the closed box;

[0012] A plurality of stirring units are provided, one corresponding to the positioning frame, and the stirring unit comprises a driving shaft, one end of which is rotatably connected to the positioning frame, and the other end of which is transversely extended into the closed box.

[0013] The second bevel gear is mounted on one end of the drive shaft that passes through the closed box and meshes with the first bevel gear.

[0014] at least one stirring blade mounted on the drive shaft and located outside the closed box;

[0015] At least one external excavation module is arranged at intervals up and down and is located below the closed box, and the external excavation module includes

[0016] A plurality of external excavation stirring blades are arranged transversely and evenly surround the outer circumference of the drill rod.

[0017] The present application can carry out three-dimensional mixing of the entire pile body through the external excavation module and the three-dimensional mixing module. The mixing is more thorough and uniform, and the necking and slurry bubbling phenomena are avoided. The small diameter of the drill rod effectively improves the problem of uneven mixing in the center of the pile body caused by the excessively large diameter of the drill rod during construction in a soft soil foundation. No columnar voids will remain on the reinforced soil after construction, which significantly improves the construction efficiency and the mixing effect.

[0018] On the basis of the above technical solution, the solution of this application can also be improved as follows:

[0019] Preferably, the closed box is of cylindrical structure and is arranged concentrically with the drill rod; adopting this solution can reduce the resistance encountered during the rotation process, thereby improving the stirring effect.

[0020] Preferably, the stirring blade comprises

[0021] Stirring rod;

[0022] A plurality of first rake teeth are mounted on the stirring rod and are spaced apart along the axis direction of the stirring rod. The adoption of this solution improves the mixing effect.

[0023] Preferably, the outer digging stirring blade is provided with a plurality of second rake teeth, and the second rake teeth are arranged at intervals along the axial direction of the outer digging stirring blade. By adopting this solution, the stirring effect on the material is improved.

[0024] Preferably, the positioning frame includes

[0025] A connecting plate, arranged vertically;

[0026] A guide upper plate, one end of which is fixedly connected to the top of the connecting plate, and the other end of which extends obliquely upward to be fixedly connected to the side wall of the closed box;

[0027] The guide lower plate has one end fixedly connected to the bottom of the connecting plate, and the other end extends obliquely downward to be fixedly connected to the side wall of the closed box. By adopting this solution, the soil can be diverted during the sinking and lifting process of the device, thereby guiding the soil to move to both sides to reduce the resistance and improve the use effect.

[0028] Preferably, a slurry delivery channel is provided in the drill rod, and a plurality of laterally arranged shotcrete pipes are provided at one end of the drill rod close to the rotary drill bit. The plurality of shotcrete pipes are evenly installed around the outer circumference of the drill rod and are connected to the slurry delivery channel. By adopting this solution, the mixing effect can be improved, and the conveying operation is convenient, time-saving and labor-saving, the labor intensity of the operators is reduced, and the overall operating efficiency is improved.

[0029] Through the above technical solution, the utility model achieves the following beneficial effects:

[0030] 1. The present application can carry out three-dimensional mixing of the entire pile body through the external excavation module and the three-dimensional mixing module. The mixing is more thorough and uniform, and the shrinkage and slurry phenomena are avoided. The small diameter of the drill rod effectively improves the problem that the center of the pile body cannot be mixed uniformly due to the large diameter of the drill rod during construction in the soft soil foundation, so that no columnar voids will remain on the reinforced soil after construction, which significantly improves the construction efficiency and the mixing effect;

[0031] 2. By setting up a guide upper plate and a guide lower plate, the present application can enable the positioning frame to guide the soil during the sinking and lifting process of the device, thereby guiding the soil to move to both sides to reduce the resistance and improve the use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 It is a front view of a multi-directional mixing drill bit for cement-soil mixing piles according to a specific embodiment of the utility model;

[0034] Figure 2 for Figure 1 The front cross-sectional view of the multi-directional mixing drill bit of the cement soil mixing pile shown;

[0035] Figure 3 for Figure 2 The enlarged schematic diagram of point A in the middle;

[0036] Figure 4 for Figure 1 A top view of a multi-directional mixing drill bit for a cement soil mixing pile is shown;

[0037] Figure 5 for Figure 1 A top view cross-sectional view of a multi-directional mixing drill bit for a cement-soil mixing pile;

[0038] Figure 6 for Figure 1 A side cross-sectional view of a multi-directional mixing drill bit for a cement-soil mixing pile;

[0039] Description of Reference Numerals

[0040] 1. Drill rod; 2. Closing box; 3. Rotating drill bit; 4. Positioning frame; 5. Three-dimensional mixing module; 6. External excavation module; 7. Shotcrete pipe;

[0041] 11. slurry delivery channel; 41. connecting plate; 42. upper guide plate; 43. lower guide plate; 51. first bevel gear; 52. stirring unit; 61. external digging stirring blade; 62. second rake tooth;

[0042] 521, driving shaft; 522, second bevel gear; 523, stirring blade;

[0043] 523a, stirring rod; 523b, first rake tooth. DETAILED DESCRIPTION

[0044] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0045] First of all, it should be noted that in the following description, some directional words involved in order to clearly illustrate the technical solution of the utility model, such as "top", "bottom", etc., are all meanings that are inferred from the normal directions of the components in the multi-directional mixing drill bit of the cement soil mixing pile. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the utility model.

[0046] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features.

[0047] In this application, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0048] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0049] Example:

[0050] like Figures 1 to 6 As shown, an embodiment of the present application discloses a multi-directional mixing drill bit for cement soil mixing piles, which is used for the construction of cement soil mixing pile anti-seepage walls. Its specific structure includes: a drill rod 1, a closing box 2, a rotating drill bit 3, multiple positioning frames 4, at least one three-dimensional mixing module 5 and at least one external excavation module 6.

[0051] The drill rod 1 is vertically arranged, preferably in a cylindrical structure, so as to reduce the resistance to rotation; when the drill rod 1 passes through the upper and lower surfaces of the sealing box 2, it is rotatably sealed and connected to the sealing box 2 through the sealing shaft, thereby ensuring the sealing protection effect of the sealing box 2.

[0052] The sealing box 2 is rotatably sleeved on the drill rod 1 and is limited in the axial direction of the drill rod 1 to provide a stable support for the positioning frame 4. A sealed chamber is provided inside the sealing box to protect the transmission components.

[0053] Exemplarily, the closed box 2 is of cylindrical structure and is arranged concentrically with the drill rod 1, so as to reduce the resistance encountered during the rotation process, thereby improving the stirring effect.

[0054] The rotary drill bit 3 is installed at the bottom of the drill rod 1; the bottom of the rotary drill bit 3 is a conical structure, which can improve the soil drilling effect; a detachable connection is preferably used, such as bolts and nuts, to facilitate disassembly and replacement.

[0055] The positioning frames 4 are evenly installed around the outer circumference of the closed box 2. In this embodiment, four positioning frames 4 are selected and distributed in a cross shape. The force is evenly distributed, which improves the structural stability and ensures the actual use effect. However, it is not limited to this. It can also be three, five or other quantities, without specific limitation.

[0056] The three-dimensional stirring modules 5 are arranged at intervals up and down to vertically stir the material on the side of the drill pipe 1. In this embodiment, there is one, but it is not limited to this, and there can also be two, three or more, without specific limitation.

[0057] Specifically, the three-dimensional stirring module 5 includes:

[0058] The first bevel gear 51 is fixedly sleeved on the drill rod 1 and is located inside the closed box 2; the first bevel gear 51 is a 45° bevel gear and a fixed bevel gear;

[0059] The plurality of stirring units 52 correspond one-to-one with the positioning frames 4 and are used to vertically stir the material on one side of the drill rod 1 ; in this embodiment, there are four stirring units 52 , corresponding to the number of the positioning frames 4 .

[0060] Exemplarily, the stirring unit 52 includes:

[0061] The driving shaft 521 has one end rotatably connected to the positioning frame 4 and the other end transversely penetrates into the closed box 2. The driving shaft 521 is rotatably connected to the closed box 2 to ensure the closed protection effect of the closed box 2.

[0062] The second bevel gear 522 is mounted on one end of the driving shaft 521 that penetrates into the closed box 2 and meshes with the first bevel gear 51. The second bevel gear 522 is a 45° bevel gear and a movable bevel gear;

[0063] At least one stirring blade 523 is installed on the driving shaft 521 and is located outside the closed box 2. In the present embodiment, two stirring blades 523 are provided and are staggered along the axis direction of the driving shaft 521, so as to increase the stirring range, ensure that the driving shaft 521 is subjected to uniform force, and improve the structural stability.

[0064] At least one external excavation module 6 is arranged at intervals up and down and is located below the closed box 2. The external excavation module 6 is used to laterally stir the material on the side of the drill pipe 1. In this embodiment, two external excavation modules are provided and are arranged at intervals up and down to improve the stirring effect, reduce stress concentration, and improve structural strength.

[0065] Specifically, the external excavation module 6 includes:

[0066] A plurality of external excavation stirring blades 61 are arranged transversely and evenly around the outer circumference of the drill rod 1, thereby ensuring uniform force on the drill rod 1. In the present embodiment, the external excavation stirring blades 61 are of a square rod type structure and are two in number. However, the external excavation stirring blades 61 are not limited thereto and may also be of a round rod type structure and are three, four or more in number without specific limitation.

[0067] Preferably, a plurality of second rake teeth 62 are provided on the outer digging stirring blade 61, and the second rake teeth 62 are arranged at intervals along the axial direction of the outer digging stirring blade 61; the second rake teeth 62 are arranged on both sides of the rotating surface of the outer digging stirring blade 61 and are inclined at 45°, thereby improving the stirring effect on the material.

[0068] During construction, the drill rod 1 is first driven to rotate by the pile driver, and then the entire device is pressed downward into the soil to be reinforced. The specific process is: the drill rod 1 is driven to rotate, and the drill rod 31 drives the rotary drill bit 3 to rotate, so that the soil is excavated during the downward pressing process, and then cement slurry is transported into the excavated soil. Then, the external excavation stirring blade 61 of the external excavation module 6 will stir the cement slurry and the soil horizontally under the drive of the drill rod 31, so that the device can gradually sink into the soil to be reinforced; at this time, since the positioning frame 4 is not limited, the drill rod 1 will drive the closed box 2 to rotate slightly, thereby driving the positioning frame 4 to rotate synchronously. When the positioning frame 4 also sinks into the soil to be reinforced, since the positioning frame 4 is blocked by the soil, it will not rotate synchronously or even stop rotating. Therefore, the drill rod 1 will drive the three-dimensional stirring module 5 to move, which drives multiple stirring units 52 to fully stir the periphery. The specific process is as follows: the drill rod 1 drives the second bevel gear 522 through the first bevel gear 51, thereby rotating the drive shaft 521, and then driving multiple mixing blades 523 to rotate vertically around the drive shaft 521, so as to vertically mix the soil and cement soil until they sink to the designed depth, and then stop the cement slurry delivery, and the drill rod continues to rotate until the pile driver lifts the device to the ground and stops.

[0069] It should be noted that, during the process of lifting the device to the ground, firstly, due to the large diameter of the closed box 2, the large columnar cavity generated by its sinking cannot be naturally backfilled and closed; then, with the stirring of the external excavation stirring blade 61 during the lifting process, the material flows back to fit the drill rod 1, thereby forming a small columnar cavity adapted to the drill rod 1; and when the drill rod 1 is lifted away, due to the small diameter of the drill rod 1, the small columnar cavity can be naturally backfilled with the flow of the material. Compared with the prior art, it does not use the inner and outer double drill rods 1, so that the diameter of the drill rod 1 is greatly reduced, effectively improving the problem that the center of the pile body cannot be stirred evenly due to the large diameter of the drill rod 1 during construction in soft soil foundations, and ensures that there will be no cavities left on the reinforced soil after construction, which significantly improves the construction efficiency and the stirring effect.

[0070] The utility model can carry out three-dimensional mixing of the whole pile body through the external excavation module 6 and the three-dimensional mixing module 5. The mixing is more thorough and uniform, and the shrinkage and slurry phenomena are avoided. In addition, the diameter of the drill rod 1 is small, which effectively improves the problem that the center of the pile body cannot be mixed uniformly due to the excessive diameter of the drill rod 1 during construction in a soft soil foundation, so that no columnar voids will remain on the reinforced soil after construction, which significantly improves the construction efficiency and enhances the mixing effect.

[0071] In some embodiments, Figures 1-2 As shown, the stirring blade 523 is further designed to improve the mixing effect, which includes:

[0072] A stirring rod 523a, which is perpendicular to the driving shaft 521 and has a cylindrical structure, and is used to reduce resistance during stirring;

[0073] A plurality of first rake teeth 523b are mounted on the stirring rod 523a and are spaced apart along the axis direction of the stirring rod 523a; the first rake teeth 523b are disposed on both sides of the rotating surface of the stirring rod 523a, thereby improving the stirring effect on the material.

[0074] In some embodiments, Figures 1-2 As shown, the positioning frame 4 is further designed to include

[0075] The connecting plate 41 is vertically arranged to support the driving shaft 521;

[0076] The guide upper plate 42 has one end fixedly connected to the top of the connecting plate 41, and the other end extends obliquely upward to be fixedly connected to the side wall of the closed box 2; the guide upper plate 42 can be a straight plate or an arc-shaped plate, which is not specifically limited;

[0077] The guide lower plate 43 has one end fixedly connected to the bottom of the connecting plate 41 and the other end extending obliquely downward to be fixedly connected to the side wall of the closed box 2; the guide lower plate 43 can be a straight plate or an arc-shaped plate, which is not specifically limited.

[0078] Through the design of the positioning frame 4, the soil can be diverted during the sinking and lifting process of the device, so that the soil can be guided to move to both sides to reduce the resistance and improve the use effect.

[0079] In some embodiments, Figure 6 As shown, in order to facilitate the transportation of cement slurry, a slurry delivery channel 11 is provided in the drill rod 1, and a plurality of laterally arranged shotcrete pipes 7 are provided at one end of the drill rod 1 close to the rotary drill bit 3. The plurality of shotcrete pipes 7 are evenly installed around the outer periphery of the drill rod 1 and are connected to the slurry delivery channel 11.

[0080] Preferably, the spraying pipe 7 is arranged between the positioning frame 4 and the uppermost external excavation module 6, so as to utilize the natural infiltration of cement slurry to mix with the soil stirred by the external excavation module 6, thereby improving the actual mixing effect.

[0081] After the device is sunk into the soil, cement slurry is input into the slurry delivery channel 11 in the drill rod 1 , and then the cement slurry flows downward in the slurry delivery channel 11 and is finally sprayed into the soil through the spraying pipe 7 .

[0082] Through the above arrangement, cement slurry can be conveniently and quickly transported to the soil to be reinforced. It can penetrate and rotate with the drill rod 1, thereby improving the mixing effect. The transportation operation is convenient, saving time and effort, reducing the labor intensity of operators and improving overall operating efficiency.

[0083] In the specification of the present utility model, a lot of specific details are described. However, it is understood that the embodiments of the present utility model can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this specification.

[0084] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.

Claims

1. A multi-directional mixing drill bit for cement soil mixing piles, characterized in that: include: Drill pipe (1); A closing box (2) is rotatably sleeved on the drill rod (1); A rotary drill bit (3) mounted at the bottom of the drill rod (1); A plurality of positioning frames (4) are evenly mounted around the outer circumference of the closed box (2); At least one three-dimensional stirring module (5) is arranged at intervals up and down, and the three-dimensional stirring module (5) comprises A first bevel gear (51) is fixedly sleeved on the drill rod (1) and is located inside the closed box (2); A plurality of stirring units (52) corresponding one to the positioning frame (4), the stirring units (52) comprising The driving shaft (521) has one end rotatably connected to the positioning frame (4) and the other end transversely penetrates into the closed box (2). The second bevel gear (522) is mounted on one end of the drive shaft (521) that passes through the closed box (2) and meshes with the first bevel gear (51). at least one stirring blade (523), mounted on the driving shaft (521) and located outside the closed box (2); At least one external excavation module (6) is arranged at intervals up and down and is located below the closed box (2), and the external excavation module (6) includes A plurality of external excavation stirring blades (61) are arranged transversely and evenly surround the outer circumference of the drill rod (1).

2. The multi-directional mixing drill bit for cement soil mixing pile according to claim 1, characterized in that: The closed box (2) is of cylindrical structure and is arranged concentrically with the drill rod (1).

3. The multi-directional mixing drill bit for cement soil mixing pile according to claim 1, characterized in that: The stirring blade (523) includes A stirring rod (523a); A plurality of first rake teeth (523b) are mounted on the stirring rod (523a) and are arranged at intervals along the axial direction of the stirring rod (523a).

4. The multi-directional mixing drill bit for cement soil mixing pile according to claim 1, characterized in that: The outer digging and stirring blade (61) is provided with a plurality of second rake teeth (62), and the second rake teeth (62) are arranged at intervals along the axial direction of the outer digging and stirring blade (61).

5. The multi-directional mixing drill bit for cement soil mixing pile according to claim 1, characterized in that: The positioning frame (4) comprises A connecting plate (41) is arranged vertically; A flow guide upper plate (42), one end of which is fixedly connected to the top of the connecting plate (41), and the other end of which extends obliquely upward to be fixedly connected to the side wall of the closed box (2); The lower guide plate (43) has one end fixedly connected to the bottom of the connecting plate (41) and the other end extending obliquely downward to be fixedly connected to the side wall of the closed box (2).

6. The multi-directional mixing drill bit for cement soil mixing pile according to claim 1, characterized in that: A grouting channel (11) is provided inside the drill rod (1), and a plurality of laterally arranged grouting pipes (7) are provided at one end of the drill rod (1) close to the rotary drill bit (3). The plurality of grouting pipes (7) are evenly mounted around the outer circumference of the drill rod (1) and are in communication with the grouting channel (11).

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