An automatic control device for spraying grout up and down the drill rod of a mixing pile

Abstract

This invention relates to an automatic control device for the upper and lower grouting of a mixing pile drill rod. The device involves installing a single-hole drill rod inside the main mixing pile drill rod. During downward drilling, the drill bit, under soil pressure, moves the internal drill rod upward, sealing the upper grouting port of the main drill rod. The opening of the internal single-hole drill rod coincides with the lower grouting port of the main drill rod, allowing grout to be sprayed only from the lower grouting port. Conversely, during upward drilling, the internal drill rod, under its own weight and the pressure of the drill bit blades, moves downward, sealing the lower grouting port, allowing grout to be sprayed only from the upper grouting port. The grouting ports are located at the upper and lower ends of the mixing blades, ensuring thorough mixing of the grout by each blade and improving the construction quality of the mixing pile. Regardless of whether the main mixing pile drill rod rotates clockwise or counterclockwise, downward drilling activates the lower grouting port, and upward drilling activates the upper grouting port, improving the ease of operation of the machinery and fully demonstrating advantages such as energy saving, emission reduction, and cost savings.

Description

Technical Field

[0001] This invention belongs to the field of foundation pit engineering technology and relates to an automatic control device for the upper and lower spraying of grout on the drilling rod of a mixing pile. It is mainly used for foundation pit protection and water stopping and foundation reinforcement in civil and industrial infrastructure construction. Background Technology

[0002] Currently, dual-axis mixing piles, triple-axis mixing piles, five-axis mixing piles, and six-axis mixing piles are commonly used for foundation pit retaining and water stopping and foundation reinforcement.

[0003] Soil mixing piles are a method for reinforcing saturated and soft clay foundations. They utilize a special mixing machine to forcibly mix the soft soil and the solidifying agent deep within the foundation. Through a series of physicochemical reactions between the solidifying agent and the soft soil, the soft soil hardens into a high-quality foundation with integrity, water stability, and a certain strength. Conventional grouting nozzles are located at the bottom and are opened and closed by rotating the drill rod clockwise or counterclockwise. This is prone to operator error, resulting in discontinuous grouting, uneven mixing, and negatively impacting the quality of the mixing pile.

[0004] To address the aforementioned shortcomings, this invention relates to an automatic control device for the upper and lower grouting of a mixing pile drill rod. This device involves installing a single-hole drill rod inside the main mixing pile drill rod. During downward drilling, the drill head, under soil pressure, moves the internal drill rod upward, sealing the upper grouting port of the main drill rod. The opening of the internal single-hole drill rod coincides with the lower grouting port of the main drill rod, allowing grout to be sprayed only from the lower grouting port. Conversely, during upward drilling, the internal drill rod, under its own weight and the pressure of the drill bit blades, moves downward, sealing the lower grouting port, allowing grout to be sprayed only from the upper grouting port. The grouting ports are located at the upper and lower ends of the mixing blades, ensuring thorough mixing of the grout by each blade and improving the construction quality of the mixing pile. Regardless of whether the main mixing pile drill rod rotates clockwise or counterclockwise, downward drilling activates the lower grouting port, and upward drilling activates the upper grouting port, improving the ease of operation of the machinery and fully demonstrating advantages such as energy saving, emission reduction, and cost savings. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing an automatic control device for the upper and lower grouting of the drilling rod in a mixing pile. This device involves installing a single-hole drill rod inside the main mixing pile drill rod. During downward drilling, the drill head is subjected to soil pressure, causing the internal drill rod to move upward and seal the upper grouting port of the main drill rod. The opening of the internal single-hole drill rod coincides with the lower grouting port of the main drill rod, resulting in grouting only from the lower grouting port. Conversely, during upward drilling, the internal drill rod's own weight and the pressure of the drill bit blades cause it to move downward, sealing the lower grouting port, resulting in grouting only from the upper grouting port. The grouting ports are located at the upper and lower ends of the mixing blades, ensuring thorough mixing of the grout by each blade and improving the construction quality of the mixing pile. Regardless of whether the main mixing pile drill rod rotates clockwise or counterclockwise, downward drilling activates the lower grouting port, and upward drilling activates the upper grouting port, improving the ease of operation of the machinery and fully demonstrating advantages such as energy saving, emission reduction, and cost savings.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] 1. An automatic control device for the upper and lower grouting of a mixing pile drill rod. This device involves installing a single-hole drill rod inside the main mixing pile drill rod. During downward drilling, the drill bit, under soil pressure, moves the internal drill rod upward, sealing the upper grouting port of the main drill rod. The opening of the internal single-hole drill rod coincides with the lower grouting port of the main drill rod, allowing grout to be sprayed only from the lower grouting port. Conversely, during upward drilling, the internal drill rod, under its own weight and the pressure of the drill bit blades, moves downward, sealing the lower grouting port, allowing grout to be sprayed only from the upper grouting port. The grouting ports are located at the upper and lower ends of the mixing blades, ensuring thorough mixing of the grout by each blade and improving the construction quality of the mixing pile. Regardless of whether the main mixing pile drill rod rotates clockwise or counterclockwise, downward drilling activates the lower grouting port, and upward drilling activates the upper grouting port, improving the ease of operation of the machinery and fully demonstrating the advantages of energy saving, emission reduction, and cost savings.

[0008] 2. The diameter of the drill rod blade of the main body of the mixing pile can be 500~1000mm, and it can be used in multi-axis mixing piles such as single-axis, double-axis, triple-axis, and five-axis.

[0009] 3. The device described above automatically controls the opening of the upper and lower grouting nozzles through water and soil pressure and the weight of the internal drill rod, without consuming any electricity.

[0010] 4. The grout injection port of the mixing pile drill rod is located 200~1000mm below the rotating blade.

[0011] 5. The grout injection nozzle on the drilling rod of the mixing pile is located 200~1000mm above the rotating blade.

[0012] 6. The single-hole drill rod has an umbrella-shaped cap at the bottom, and the diameter of the umbrella-shaped cap is larger than the diameter of the main drill rod.

[0013] Compared with existing technologies:

[0014] 1. This device can be automatically controlled, requiring no manual operation for forward or reverse rotation.

[0015] 2. The slurry is thoroughly mixed by all the mixing blades, making the quality of the mixing piles more reliable. Attached Figure Description

[0016] Figure 1 Schematic diagram of grout spraying at the nozzle during the upward lifting of the drilling rod of the mixing pile.

[0017] 1. Internal single-hole drill rod; 2. Internal single-hole drill rod opening; 3. Main mixing pile drill rod; 4. Upper grouting nozzle of the main mixing pile drill rod; 5. Lower grouting nozzle of the main mixing pile drill rod.

[0018] Figure 2 Schematic diagram of grout spraying profile at the grouting nozzle during the downward drilling process of the mixing pile drill rod. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments. Example

[0020] An automatic control device for grouting the upper and lower nozzles of a mixing pile drill rod is disclosed. This device involves a single-hole drill rod 1 installed inside the main mixing pile drill rod 3. During downward drilling, the drill head, under soil pressure, moves the internal drill rod 1 upward, sealing the upper grouting port 4 of the main drill rod. The opening 2 of the internal single-hole drill rod then coincides with the lower grouting port 5 of the main drill rod, allowing grout to be sprayed only from the lower grouting port 5. Conversely, during upward drilling, the internal drill rod 1, under its own weight and the pressure of the drill bit blades, moves downward, sealing the lower grouting port 5 of the main drill rod, allowing grout to be sprayed only from the upper grouting port 4. The grouting ports are located at the upper and lower ends of the mixing blades, ensuring thorough mixing of the grout by each blade and improving the construction quality of the mixing pile. Regardless of whether the main mixing pile drill rod 3 rotates clockwise or counterclockwise, downward drilling activates the lower grouting port 5, and upward drilling activates the upper grouting port 4, enhancing the ease of operation of the machinery and fully demonstrating advantages such as energy saving, emission reduction, and cost savings.

Claims

1. A device for automatic control of up and down jet grouting of a mixing pile drill rod, characterized in that By setting a single-hole drill rod inside the main mixing pile drill rod, the drill bit is subjected to soil pressure during downward drilling, causing the internal drill rod to move upward and seal the upper grouting port of the main drill rod. The opening of the internal single-hole drill rod coincides with the lower grouting port of the main drill rod, and grout is sprayed only from the lower grouting port of the main drill rod. Conversely, during upward drilling of the main drill rod, the internal drill rod moves downward due to its own weight and the pressure of the drill bit blades, sealing the lower grouting port of the main drill rod, and grout is sprayed only from the upper grouting port of the main drill rod. The grouting ports are located at the upper and lower ends of the mixing blades, so that the grout can be fully mixed by each mixing blade. Regardless of whether the main mixing pile drill rod rotates clockwise or counterclockwise, grout is sprayed from the lower grouting port when drilling downward and from the upper grouting port when drilling upward.

2. The automatic control device for spraying grout up and down the drill rod of the mixing pile according to claim 1, characterized in that, The diameter of the drill rod blades for the main body of the mixing pile is 500~1000mm, and it is used in single-axis and multi-axis mixing piles.

3. The automatic control device for spraying grout up and down the drill rod of the mixing pile according to claim 1, characterized in that, The device automatically controls the opening of the upper and lower grouting nozzles through water and soil pressure and the weight of the internal drill rod, without consuming electricity.

4. The automatic control device for spraying grout up and down the drill rod of the mixing pile according to claim 1, characterized in that, The grout injection port of the mixing pile drill rod is located 200-1000mm below the rotating blade.

5. The automatic control device for spraying grout up and down the drill rod of the mixing pile according to claim 1, characterized in that, The grout injection nozzle on the drilling rod of the mixing pile is located 200-1000mm above the rotating blade.

6. The automatic control device for spraying grout up and down the drill rod of the mixing pile according to claim 1, characterized in that, The single-hole drill rod has an umbrella-shaped cap at the bottom, and the diameter of the umbrella-shaped cap is larger than the diameter of the main drill rod.

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