Powder spraying device for reinforcing clay layer

Abstract

The utility model discloses a kind of powder spraying devices for clay layer reinforcement, belong to powder spraying device technical field, solve although powder spraying adopts high-pressure powder spraying in prior art, but the viscosity of clay layer is larger, to easily cause powder spraying to be more sprayed in the surface of borehole inner wall or the depth of spray into borehole inner wall is shallow, easily affect mixing uniformity, to easily cause the problem of poor clay layer reinforcement effect. Including drill rod, drill bit set on drill rod, spiral block is set on the drill rod at drill bit side, threaded powder spraying pipe is set on the drill rod at the connecting place with spiral block, main powder spraying pipe is set on the drill rod and is connected with threaded powder spraying pipe and powder spraying mechanism, branch powder spraying pipe is set on spiral block and is connected with main powder spraying pipe. The utility model is used for powder spraying reinforcement.

Description

Technical Field

[0001] A powder spraying device for clay layer reinforcement is disclosed, which belongs to the technical field of powder spraying devices. Background Technology

[0002] The powder spraying device for clay layer reinforcement uses compressed air to spray hardener powder (such as cement, lime, etc.) into deep soft soil, and the drill bit mixing blades forcefully mix it with the soft soil (such as clay), so that the soft soil hardens to form a reinforcement with integrity, water stability and a certain strength.

[0003] The specific implementation steps of the existing technology are as follows: After the powder spraying device for clay layer reinforcement is moved to the designed pile position, the verticality is adjusted, the drilling rig is started, and the drill rod drives the drill bit to rotate and drill downwards until the required depth of the clay layer to be reinforced is reached. After the drill bit reaches the designed depth, the powder conveying system is started. The drill bit rotates in the opposite direction and is lifted, while the curing agent powder is delivered to the drill bit by compressed air from the drill rod and sprayed out from the special nozzle of the drill bit. Under the strong stirring of the mixing blades, the powder is fully mixed with the surrounding clay to form a composite structure together with the surrounding clay, thereby achieving the reinforcement of the clay layer.

[0004] For the reinforcement of clay layers, existing powder spraying devices for clay layer reinforcement have the following technical problems: Although high-pressure powder spraying is used, the clay layer has a high viscosity, which can easily cause the powder to be sprayed onto the inner surface of the borehole or to penetrate the inner wall of the borehole to a shallow depth. This can affect the uniformity of mixing and thus easily lead to poor reinforcement effect of the clay layer. Utility Model Content

[0005] The purpose of this invention is to provide a powder spraying device for clay layer reinforcement, which solves the problem that although the existing technology uses high-pressure powder spraying, the clay layer has a high viscosity, which easily causes the powder to be sprayed onto the inner surface of the borehole or to be sprayed into the inner wall of the borehole at a shallow depth, which easily affects the uniformity of mixing and thus easily leads to poor reinforcement effect of the clay layer.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A powder spraying device for reinforcing clay layers includes a drill rod, a drill bit mounted on the drill rod, a spiral block mounted on the drill rod located on one side of the drill bit, a threaded powder spraying pipe mounted on the drill rod at the connection point with the spiral block, a main powder spraying pipe mounted on the drill rod and connected to the threaded powder spraying pipe and the powder spraying mechanism, and a branch powder spraying pipe mounted on the spiral block and connected to the main powder spraying pipe.

[0007] Furthermore, the spiral block is provided with a threaded cavity for respectively arranging the threaded powder spraying pipe and the branch powder spraying pipe, and a branch cavity connected to the threaded cavity.

[0008] Furthermore, stirring teeth are provided on one side of the spiral block's edge.

[0009] Furthermore, the stirring teeth are disposed on the spiral block corresponding to the branch cavity, and the stirring teeth are provided with a powder spraying channel connected to the branch powder spraying pipe.

[0010] Furthermore, the stirring teeth are made of cemented carbide.

[0011] Furthermore, the branch powder spraying pipes are evenly spaced on the spiral block along the spiral path of the spiral block.

[0012] Furthermore, the outlet direction of the powder spraying channel forms an angle of 20°-30° with the spiral block.

[0013] Furthermore, reinforcing ribs are provided on the upper and lower surfaces of the spiral block.

[0014] Furthermore, the inner diameter of the main powder spraying pipe is larger than the inner diameter of the threaded powder spraying pipe, and the inner diameter of the threaded powder spraying pipe is larger than the inner diameter of the branch powder spraying pipe.

[0015] Compared with the prior art, the advantages of this utility model are: I. This utility model involves installing a spiral block, a threaded powder injection pipe, and branch powder injection pipes on the drill rod located on one side of the drill bit. Air or powder is introduced through a main powder injection pipe connected to the threaded powder injection pipe on the drill rod. When drilling at a designated location in the clay layer, the drill bit plays the primary drilling role, while the spiral block assists. During drilling, air intake through the main powder injection pipe prevents blockage of the threaded and branch powder injection pipes. When a certain depth is reached, the drill rod rotates in the opposite direction to lift the borehole, and the spiral block disturbs and cuts the inner wall of the borehole. Powder is fed synchronously through the main powder injection pipe and sprayed through the threaded powder injection pipe and branch powder injection pipe. The powder is sprayed not only onto the inner surface of the borehole, but also, based on cutting and high-pressure powder injection, can be sprayed into a deeper position in the inner wall of the borehole. As the amount of powder injected gradually increases, the disturbance of the spiral block at the current position gradually increases, and this disturbance is to stir the clay around the borehole and the powder injected. During the drill rod supply process, secondary stirring can also be carried out by the drill bit, which can make the stirring uniformity better and ultimately make the clay layer reinforcement effect better. 2. The spiral block in this utility model is provided with a threaded cavity and a branch cavity, the purpose of which is to protect the threaded powder spraying pipe and the branch powder spraying pipe and prevent them from being easily damaged. Third, the present invention provides stirring teeth on the spiral block in order to improve the cutting effect of the stirring feed; IV. The purpose of setting the powder spraying channel on the stirring tooth in this utility model is to facilitate the powder to be sprayed out along the cutting surface during powder spraying, so as to facilitate faster and more uniform mixing in the subsequent process. V. This utility model specifies that the stirring teeth are made of hard alloy material to avoid easy damage; VI. The present invention limits the branch powder spraying pipes to be set at equal intervals along the spiral path of the spiral block on the spiral block, so as to facilitate more uniform powder spraying and subsequent rapid and uniform mixing. VII. The present invention limits the outlet direction of the powder spraying channel to form an angle of 20°-30° with the spiral block, which is more conducive to the mixing of powder with clay after spraying. 8. The present invention provides reinforcing ribs on the spiral block, which can further increase the strength of the spiral block; 9. In this utility model, the inner diameter of the main powder spraying pipe is larger than that of the threaded powder spraying pipe, and the inner diameter of the threaded powder spraying pipe is larger than that of the branch powder spraying pipe. The purpose is to facilitate high-pressure powder spraying and further prevent clogging. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the drill rod structure located above and to one side of the drill bit in this utility model; Figure 2 for Figure 1 A schematic diagram of a structure with stirring teeth on the central spiral block; Figure 3 for Figure 2 Schematic diagram of the structure of the central spiral block; Figure 4 for Figure 1 A schematic diagram showing the interconnected structure of the main powder spraying pipe, the threaded powder spraying pipe, and the branch powder spraying pipe; In the diagram: 1-Drill rod, 2-Helical block, 3-Threaded powder injection pipe, 4-Main powder injection pipe, 5-Branch powder injection pipe, 6-Threaded cavity, 7-Branch cavity, 8-Stirring teeth, 9-Powder injection channel, 10-Reinforcing rib. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0019] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0020] In the description of this utility model, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" appear to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0021] Furthermore, the terms "first," "second," and "third" are used only for distinguishing descriptions and should not be interpreted as indicating or implying relative importance.

[0022] Furthermore, the use of terms such as "horizontal," "vertical," and "suspended" does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0023] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0025] Example 1 To address the problem that existing technologies, although employing high-pressure powder spraying, suffer from the high viscosity of the clay layer, resulting in powder being sprayed primarily onto the borehole surface or only shallowly into the borehole wall, thus affecting mixing uniformity and leading to poor clay layer reinforcement, the following approach is needed. Figure 1-4As shown, a powder spraying device for reinforcing clay layers is provided, including a drill rod 1, a drill bit mounted on the drill rod 1, a spiral block 2 mounted on the drill rod 1 located on one side of the drill bit, a threaded powder spraying pipe 3 mounted on the drill rod 1 at the connection point with the spiral block 2, a main powder spraying pipe 4 mounted on the drill rod 1 and connected to the threaded powder spraying pipe 3 and the powder spraying mechanism, and a branch powder spraying pipe 5 mounted on the spiral block and connected to the main powder spraying pipe 4.

[0026] In practice, after the powder spraying device for clay layer reinforcement is moved to the designed pile position, the verticality is adjusted, the drilling rig is started, and the drill rod drives the drill bit to rotate and drill downwards. During drilling, air is introduced into the main powder spraying pipe to prevent blockage of the threaded powder spraying pipe and branch powder spraying pipes, until the required depth of the clay layer to be reinforced is reached. After the drill bit reaches the designed depth, the powder conveying system (i.e., the powder spraying mechanism, which is existing and will not be described in detail here) is started. The drill bit rotates in the opposite direction and is lifted up, while the curing agent powder is sent from the main powder spraying pipe to the threaded powder spraying pipe through compressed air, and then from the threaded powder spraying pipe to the branch powder spraying pipe. The powder sprayed not only hits the inner surface of the borehole, but also, based on the cutting (or disturbance) of the auger blocks and high-pressure spraying, can penetrate deeper into the inner wall of the borehole. As the amount of powder injected gradually increases, the disturbance of the auger block at the current position gradually increases. This disturbance effectively mixes the clay around the borehole with the injected powder. During the drill rod feeding process, secondary mixing can be performed by the drill bit, resulting in better mixing uniformity and ultimately better reinforcement of the clay layer. Under the strong mixing of the auger block and the drill bit, the powder is fully mixed with the surrounding clay to form a composite structure, thus reinforcing the clay layer. In this embodiment, the auger block is not the part subjected to the greatest stress during drilling or mixing. During drilling, the drill bit acts as the main cutting part. During mixing, the amount of powder injected gradually increases. Because the drill rod is continuously raised, the stress on the auger block is smaller than that on the drill bit.

[0027] Example 2 Based on Embodiment 1, the spiral block 2 is provided with a threaded cavity 6 for respectively accommodating the threaded powder spraying pipe 3 and the branch powder spraying pipe 5, and a branch cavity 7 connected to the threaded cavity 6. The purpose of providing the threaded cavity and the branch cavity on the spiral block is to protect the threaded powder spraying pipe and the branch powder spraying pipe and prevent them from being easily damaged.

[0028] Example 3 Based on Example 2, stirring teeth 8 are provided on one side of the edge of the spiral block 2. The purpose of providing stirring teeth on the spiral block is to improve the cutting effect of the stirring feed. The outermost edge of the stirring teeth 8 does not exceed the outermost edge of the drill bit to prevent excessive force during drilling.

[0029] Example 4 Based on Embodiment 3, the stirring tooth 8 is disposed on the spiral block 2 corresponding to the branch cavity 7, and the stirring tooth 8 is provided with a powder spraying channel 9 connected to the branch powder spraying pipe 5. The purpose of providing a powder spraying channel on the stirring tooth is to facilitate the powder to be sprayed out along the cutting surface during powder spraying, so as to facilitate faster and more uniform mixing in the subsequent process.

[0030] Example 5 Based on Example 4, the stirring teeth 8 are made of hard alloy material. The stirring teeth are limited to hard alloy material to avoid easy damage; the spiral block 2 can also have a thickness limit depending on actual needs. Example 6 Based on Example 5, the branch powder spraying pipes 5 are arranged at equal intervals along the spiral path of the spiral block 2, which facilitates more uniform powder spraying and subsequent rapid and uniform mixing.

[0031] Example 7 Based on Example 6, the outlet direction of the powder spraying channel 9 forms an angle of 20°-30° with the spiral block 2, such as 22°, 24°, 26° and 28°, which is more conducive to the mixing of powder with clay after spraying.

[0032] Example 8 Based on Embodiment 6, reinforcing ribs 10 are provided on the upper and lower surfaces of the spiral block 2 to further increase the strength of the spiral block. The number and placement of these ribs can be set according to actual needs, such as... Figure 1 The image shows a threaded reinforcing disc.

[0033] Example 9 Based on Example 8, the inner diameter of the main powder spraying pipe 4 is larger than the inner diameter of the threaded powder spraying pipe 3, and the inner diameter of the threaded powder spraying pipe 3 is larger than the inner diameter of the branch powder spraying pipe 5. The purpose is to facilitate high-pressure powder spraying and further prevent clogging. The specific inner diameter can be set according to actual needs.

Claims

1. A powder spraying device for reinforcing clay layers, comprising a drill rod (1) and a drill bit mounted on the drill rod (1), characterized in that: A spiral block (2) is provided on the drill rod (1) located on one side of the drill bit. A threaded powder spraying pipe (3) is provided on the drill rod (1) connected to the spiral block (2). A main powder spraying pipe (4) is provided on the drill rod (1) and connected to the threaded powder spraying pipe (3) and the powder spraying mechanism. A branch powder spraying pipe (5) is provided on the spiral block and connected to the main powder spraying pipe (4).

2. The powder spraying device for clay layer reinforcement according to claim 1, characterized in that: The spiral block (2) is provided with a threaded cavity (6) for respectively setting the threaded powder spraying pipe (3) and the branch powder spraying pipe (5) and a branch cavity (7) connected to the threaded cavity (6).

3. The powder spraying device for clay layer reinforcement according to claim 2, characterized in that: Located on one side of the edge of the spiral block (2), the spiral block (2) is provided with stirring teeth (8).

4. The powder spraying device for clay layer reinforcement according to claim 3, characterized in that: The stirring teeth (8) are set on the spiral block (2) corresponding to the branch cavity (7), and the stirring teeth (8) are provided with a powder spraying channel (9) connected to the branch powder spraying pipe (5).

5. A powder spraying device for reinforcing clay layers according to claim 3 or 4, characterized in that: The stirring teeth (8) are made of hard alloy material.

6. The powder spraying device for reinforcing clay layers according to claim 1, characterized in that: The branch powder spraying pipes (5) are arranged at equal intervals on the spiral block (2) along the spiral path of the spiral block (2).

7. The powder spraying device for clay layer reinforcement according to claim 4, characterized in that: The outlet direction of the powder spraying channel (9) forms an angle of 20°-30° with the spiral block (2).

8. The powder spraying device for clay layer reinforcement according to claim 2, characterized in that: The upper and lower surfaces of the spiral block (2) are provided with reinforcing ribs (10).

9. The powder spraying device for clay layer reinforcement according to claim 1, characterized in that: The inner diameter of the main powder spraying pipe (4) is larger than that of the threaded powder spraying pipe (3), and the inner diameter of the threaded powder spraying pipe (3) is larger than that of the branch powder spraying pipe (5).

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