Mixer drill bit device for soft soil foundation

Abstract

The utility model provides a stirrer drill bit device for a soft soil foundation, which relates to the technical field of soft soil foundation treatment and comprises a drill rod, a soil cutting device, a stirring device and a guniting pipe. The drill rod comprises a drill bit, a grouting pipe and a connector which are fixedly connected in sequence, and the grouting pipe is of a hollow structure; the soil cutting device is fixedly arranged on the outer wall of the grouting pipe; the stirring device is arranged between the soil cutting device and the connector, and the stirring device is fixedly connected with the grouting pipe; the guniting pipe is fixedly connected with the grouting pipe, and the guniting pipe is communicated with the interior of the grouting pipe. The fixed pipe and the movable pipe are combined on the slurry spraying pipe, so that slurry can be effectively prevented from overflowing along the main shaft, slurry materials are saved, the slurry can be conveyed to the periphery, the slurry is uniformly distributed in a designed radius, and the column forming quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of soft soil foundation treatment, in particular to a mixer drill bit device used for soft soil foundation. Background Art

[0002] With the progress of urbanization and the continuous development of infrastructure construction, the treatment of soft soil foundation has become an issue of increasing concern. Soft soil foundation, due to its low bearing capacity and high compressibility, poses a great challenge to engineering construction. Cement mixing pile construction is currently a commonly used method for treating soft soil foundation, but there are some problems in the implementation of the existing technology. First of all, the grouting port of the existing mixer drill device is opened on the side of the main shaft and does not protrude from the main shaft, which causes the slurry in the soft soil foundation to be more likely to emerge from the ground along the main shaft, which not only wastes materials, but also may hinder the construction progress and affect the safety of the site. At the same time, since the mixing device of the existing mixer drill device is only single-layer mixing, when constructing long piles and large-diameter cement mixing piles (pile length is greater than 15 meters, diameter is 0.6 meters to 1.5 meters), there is a problem of uneven mixing effect, which directly affects the quality and bearing capacity of the mixing piles.

[0003] Based on the above-mentioned shortcomings of the prior art, there is an urgent need for a mixer drill bit device for soft soil foundation. Utility Model Content

[0004] The purpose of the utility model is to provide a mixer drill bit device for soft soil foundation to improve the above problems. In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0005] The present application provides a mixer drill bit device for soft soil foundation, characterized in that it comprises: a drill rod, a soil cutting device, a stirring device and a grouting pipe. The drill rod comprises a drill bit, a grouting pipe and a connector which are fixedly connected in sequence, and the grouting pipe is a hollow structure; the soil cutting device is fixedly arranged on the outer wall of the grouting pipe; the stirring device is arranged between the soil cutting device and the connector, and the stirring device is fixedly connected to the grouting pipe; a grouting pipe, the grouting pipe is fixedly connected to the grouting pipe, and the grouting pipe is communicated with the inside of the grouting pipe.

[0006] Furthermore, the soil cutting device comprises two soil cutting blades, the two soil cutting blades are symmetrically arranged on both sides of the grouting pipe, and at least two vertical soil cutting blades are arranged on the soil cutting blades.

[0007] Furthermore, all the vertical soil cutting blades are arranged equidistantly along the length direction of the soil cutting blades.

[0008] Furthermore, the soil cutting blades are obliquely arranged on the outer wall of the grouting pipe, the soil cutting blades are at an angle of 10 degrees to the horizontal plane, and the setting angles of the two soil cutting blades are opposite.

[0009] Furthermore, the stirring device comprises two groups of stirring blade layers, each group of the stirring blade layers comprises two symmetrically arranged stirring blades, and the two groups of the stirring blade layers are staggered.

[0010] Furthermore, the angle between the two groups of stirring blade layers is 60 degrees.

[0011] Furthermore, the spraying pipe is arranged between two groups of stirring blade layers.

[0012] Furthermore, the length of the spray pipe is one quarter to one third of the length of the stirring blade.

[0013] Furthermore, the spraying pipe includes a fixed pipe and a movable pipe, the inner diameter of the fixed pipe cooperates with the outer wall of the movable pipe, the fixed pipe is slidably connected to the movable pipe, and the fixed pipe is fixedly connected to the grouting pipe.

[0014] Furthermore, a bent pipe is provided on the end of the movable pipe away from the fixed pipe, and the opening direction of the bent pipe is opposite to the rotation direction of the mixer.

[0015] The beneficial effects of the utility model are:

[0016] The utility model combines a fixed pipe and a movable pipe on the shotcrete pipe, which can not only effectively prevent the slurry from bubbling along the main axis, thereby saving slurry materials, but also avoid construction safety hazards caused by slurry overflow; the design of the shotcrete pipe of the utility model allows construction personnel to adjust the slurry outlet position according to the actual situation of the soft soil foundation, making the construction more flexible and adaptable.

[0017] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by implementing the embodiments of the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structures specifically pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a schematic structural diagram of a mixer drill bit device for soft soil foundation described in an embodiment of the present application;

[0020] Figure 2 A front view of the mixer drill bit device for soft soil foundation;

[0021] Figure 3 A top view of the mixer drill bit device for soft soil foundation;

[0022] Figure 4 for Figure 3 Magnified view at point I in the middle.

[0023] Markings in the figure: 1. drill rod; 11. drill bit; 12. grouting pipe; 13. connector; 2. soil cutting device; 21. soil cutting blade; 22. vertical soil cutting blade; 3. stirring device; 31. stirring blade layer; 311. stirring blade; 4. spraying pipe; 41. fixed pipe; 42. movable pipe; 43. bent pipe. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the embodiment of the utility model clearer, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, rather than all the embodiments. The components of the embodiment of the utility model generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiment of the utility model provided in the drawings is not intended to limit the scope of the utility model for protection, but merely represents the selected embodiment of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.

[0025] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of the present utility model, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0026] like Figure 1 and Figure 2As shown, this embodiment provides a mixer drill bit device for soft soil foundation, which includes a drill rod 1, a soil cutting device 2, a stirring device 3 and a grouting pipe 4. The drill rod 1 is the main component of the mixer drill bit device, which plays the role of transmitting power and supporting other components. The drill rod 1 includes a drill bit 11, a grouting pipe 12 and a connector 13 that are fixedly connected in sequence. The drill bit 11 is responsible for drilling into the soil layer. The grouting pipe 12 is a hollow structure that allows slurry to pass through and finally spray out through the grouting pipe 4. The connector 13 is connected to an external mud pump to pump the prepared slurry into the grouting pipe 12. The soil cutting device 2 is fixedly arranged on the outer wall of the grouting pipe 12. The function of the soil cutting device 2 is to cut the soil when the drill bit 11 enters the soft soil foundation to form a cylindrical space. The stirring device 3 is arranged between the soil cutting device 2 and the connector 13. The stirring device 3 is fixedly connected to the grouting pipe 12. Its function is to stir the cut soil during the drilling process so that it can be fully mixed with the slurry. The spray pipe 4 is fixedly connected with the grouting pipe 12, and the spray pipe 4 is internally communicated with the grouting pipe 12. The spray pipe 4 plays a role in uniformly and effectively spraying these slurries into the formed cylindrical space.

[0027] Preferably, if Figure 2 As shown, the soil cutting device 2 includes two soil cutting blades 21, which are symmetrically arranged on both sides of the grouting pipe 12, and at least two vertical soil cutting blades 22 are arranged on the soil cutting blades 21. The symmetrical arrangement of the soil cutting blades 21 ensures efficient and uniform cutting when drilling into soft soil, greatly improving the construction efficiency. The vertical soil cutting blades 22 further enhance the soil cutting ability, allowing the machine to pass through the soft soil more quickly and shred small obstacles and local hard blocks. It also helps to maintain the shape of the cylindrical hole in the soft soil, which is crucial to ensure the uniform distribution of the subsequent slurry and the stability of the cement mixing pile.

[0028] Preferably, if Figure 2 As shown, all vertical soil cutting blades 22 are equidistantly arranged along the length direction of the soil cutting blade 21. The equidistantly arranged blades can ensure uniform cutting when drilling into soft soil, thereby avoiding the formation of uneven holes, which is very important for the subsequent slurry injection and the uniformity of cement mixing piles.

[0029] Preferably, if Figure 2 As shown, the soil cutting blade 21 is tilted on the outer wall of the grouting pipe 12, and the soil cutting blade 21 is at an angle of 10 degrees to the horizontal plane. The setting angles of the two soil cutting blades 21 are opposite. The opposite tilt angles of the two soil cutting blades 21 make the force of the drill bit 11 balanced when drilling into the soil, reducing the deviation and vibration caused by uneven force. This symmetrical tilt design ensures the stability of the drill bit 11 when drilling into soft soil and increases the cutting area.

[0030] Preferably, if Figure 2 and Figure 3 As shown, the stirring device 3 includes two groups of stirring blade layers 31, each group of stirring blade layers 31 includes two symmetrically arranged stirring blades 311, and the two groups of stirring blade layers 31 are staggered. The increase of stirring blade layers 31 is equivalent to increasing the number of stirring times. The staggered stirring blade layers 31 ensure that the slurry and the soil can be fully mixed at multiple levels during the stirring process, so that the quality of the cement mixing pile is more uniform and stable. At the same time, due to the staggered arrangement of the stirring blades 311, the slurry can be effectively prevented from being stratified during the injection process, ensuring the uniform distribution of the slurry.

[0031] Preferably, if Figure 3 As shown, the angle between the two sets of mixing blade layers 31 is 60 degrees. The 60-degree angle design ensures that the slurry can be evenly dispersed in all directions when injected, so as to be more fully mixed with the soil to form a cement mixing pile with higher quality.

[0032] Preferably, if Figure 1 and Figure 2 As shown, the spraying pipe 4 is arranged between two groups of stirring blade layers 31. When the slurry is sprayed out, it first encounters the rotating stirring blades 311, which makes the soil and slurry mixed more evenly, thereby improving the structural strength and quality of the cement mixing pile. Such a design can reduce the situation where the slurry is directly overflowed or isolated during the spraying process, ensuring that more slurry is effectively used in soil mixing.

[0033] Preferably, the length of the spraying pipe 4 is one quarter to one third of the length of the stirring blade 311. The choice of this length, combined with the position of the spraying pipe 4 between the two groups of stirring blade layers 31, ensures that the ejected slurry interacts directly with the stirring blade 311, rather than rising directly along the main axis. The action of the stirring blade 311 further helps the slurry to mix with the soil, thereby preventing the slurry from bubbling up. Specifically, when the pile is long (greater than 15 meters), the confining pressure is large, and the slurry is easy to bubble up along the drill rod, resulting in more slurry in the upper pile body and less slurry in the lower pile body, and poor pile formation; when the pile diameter is large (diameter greater than 0.6 meters), it will cause more slurry in the center and less slurry on the outside, and the slurry cannot be sprayed out evenly, resulting in uneven distribution of hydration products on the large diameter cross-section, and the strength does not meet the requirements. In this embodiment, the slurry is moved outward to a certain distance, so that the slurry is away from the pores between the borehole and the soil, thereby preventing the slurry phenomenon and ensuring the pile formation effect at the bottom of the long column. Furthermore, in some other embodiments, more than one shotcrete pipe 4 is provided, and the length of each shotcrete pipe is different, so that the slurry can be evenly distributed on the horizontal surface, thereby improving the strength of the pile body.

[0034] Preferably, if Figure 4As shown, the shotcrete pipe 4 includes a fixed pipe 41 and a movable pipe 42, the inner diameter of the fixed pipe 41 cooperates with the outer wall of the movable pipe 42, the fixed pipe 41 is slidably connected to the movable pipe 42, and the fixed pipe 41 is fixedly connected to the grouting pipe 12. When facing the geological conditions of various soft soil foundations and different construction requirements, the shotcrete pipe 4 of this embodiment is designed to have a structure of a fixed pipe 41 and a movable pipe 42. The fixed pipe 41 is fixedly connected to the grouting pipe 12 to ensure stability. The movable pipe 42 can slide in the fixed pipe 41, allowing the operator to adjust the position of the shotcrete port according to the geological conditions and construction requirements. The sliding movable pipe 42 design enables this drill bit 11 device to adapt to the geological conditions of various soft soil foundations, providing strong adaptability.

[0035] Preferably, if Figure 4 As shown, a curved pipe 43 is provided at the end of the movable pipe 42 away from the fixed pipe 41, and the opening direction of the curved pipe 43 is opposite to the rotation direction of the mixer. Since the opening direction of the curved pipe 43 is opposite to the rotation direction of the mixer, when the mixer rotates, the centrifugal force therein will act on the slurry therein. This design makes full use of the centrifugal force, so that the slurry is pushed in the curved pipe 43, thereby enhancing the injection speed of the slurry. A higher injection speed means that the contact and mixing of the slurry and the soil will be faster and more uniform, thereby improving the mixing effect.

[0036] Furthermore, the present application provides a method for using a mixer drill bit device for soft soil foundation, comprising:

[0037] Before the construction of cement mixing piles, adjust the position of the nozzle of the grouting pipe 4 according to the geological conditions and construction requirements. During construction, first align the drill bit 11 with the construction point, rotate the soil cutting device 2 and drill into the soil to form a cylindrical space. Subsequently, the mud is transported from the mud pump to the predetermined position through the grouting pipe 12. In order to ensure that the slurry is fully mixed with the soil, and the centrifugal force generated by the curved pipe 43 is used to enhance the injection speed of the slurry. The rotation of the stirring device 3 ensures that the soil and the slurry are fully mixed to form a uniform cement mixing pile. After the construction is completed, stop stirring, remove the drill bit 11, and wait for the cement mixing pile to harden.

[0038] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

[0039] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A mixer drill bit device for soft soil foundation, characterized in that: include: A drill rod (1), the drill rod (1) comprising a drill bit (11), a grouting pipe (12) and a connector (13) which are fixedly connected in sequence, and the grouting pipe (12) is a hollow structure; A soil cutting device (2), wherein the soil cutting device (2) is fixedly arranged on the outer wall of the grouting pipe (12); a stirring device (3), the stirring device (3) being arranged between the soil cutting device (2) and the connecting head (13), the stirring device (3) being fixedly connected to the grouting pipe (12); and A spraying pipe (4), wherein the spraying pipe (4) is fixedly connected to the grouting pipe (12), and the spraying pipe (4) is internally communicated with the grouting pipe (12).

2. The mixer drill bit device for soft soil foundation according to claim 1, characterized in that: The soil cutting device (2) comprises two soil cutting blades (21), the two soil cutting blades (21) are symmetrically arranged on both sides of the grouting pipe (12), and at least two vertical soil cutting blades (22) are arranged on the soil cutting blades (21).

3. The mixer drill bit device for soft soil foundation according to claim 2, characterized in that: All the vertical soil cutting blades (22) are arranged at equal distances along the length direction of the soil cutting blade (21).

4. The mixer drill bit device for soft soil foundation according to claim 2, characterized in that: The soil cutting blades (21) are arranged obliquely on the outer wall of the grouting pipe (12), the soil cutting blades (21) are at an angle of 10 degrees to the horizontal plane, and the setting angles of the two soil cutting blades (21) are opposite.

5. The mixer drill bit device for soft soil foundation according to claim 1, characterized in that: The stirring device (3) comprises two groups of stirring blade layers (31), each group of the stirring blade layers (31) comprises two symmetrically arranged stirring blades (311), and the two groups of the stirring blade layers (31) are arranged in a staggered manner.

6. The mixer drill bit device for soft soil foundation according to claim 5, characterized in that: The angle between the two groups of stirring blade layers (31) is 60 degrees.

7. The mixer drill bit device for soft soil foundation according to claim 5, characterized in that: The spraying pipe (4) is arranged between two groups of stirring blade layers (31).

8. The mixer drill bit device for soft soil foundation according to claim 7, characterized in that: The length of the spraying pipe (4) is one quarter to one third of the length of the stirring blade (311).

9. The mixer drill bit device for soft soil foundation according to claim 8, characterized in that: The spraying pipe (4) comprises a fixed pipe (41) and a movable pipe (42), the inner diameter of the fixed pipe (41) and the outer wall of the movable pipe (42) cooperate with each other, the fixed pipe (41) and the movable pipe (42) are slidably connected, and the fixed pipe (41) is fixedly connected to the grouting pipe (12).

10. The mixer drill bit device for soft soil foundation according to claim 9, characterized in that: A bent pipe (43) is provided at the end of the movable pipe (42) away from the fixed pipe (41), and the opening direction of the bent pipe (43) is opposite to the rotation direction of the mixer.

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