Improved compaction pile construction method and device

Abstract

The invention discloses an improved soil squeezing pile construction method and device. Threaded blades at the two ends of the rotary extrusion drill bit with two thin ends and a thick middle have opposite rotation directions, thereby being beneficial to drilling into a soil layer and preventing loosened soil from escaping out of holes. A valve is arranged at a drill tip, a water injector controlled by a computer discharges water for lubricating blades, the water outlet amount and the water outlet time of the water injector are accurately controlled by the computer according to the water content of a soil layer and the diameter and the pile length of a soil squeezing pile, the drill bit is effectively lubricated, the hole squeezing resistance is effectively reduced, the hole squeezing engineering quality is not affected, and intelligent construction is achieved. The rotary extrusion drill bit is driven by a motor in a variable-frequency and variable-speed mode or driven through a gearbox, and certainly can be driven by a hydraulic motor. And the rotary extrusion drill bit is precisely lubricated by water, so that the hole extrusion resistance is greatly reduced, the motor power can be reduced, and rotary extrusion hole forming equipment can smoothly construct on a construction site with relatively small power supply capacity.

Description

Technical Field

[0001] The invention belongs to a construction engineering foundation treatment method, in particular to an improved soil squeezing pile construction method and a special device for use. Background Art

[0002] In order to eliminate the collapsible nature of loess strata and improve the bearing capacity of soft soil foundations and thick fill strata, the diesel hammer, the hole-making equipment commonly used in the past, was banned or restricted due to excessive noise and environmental pollution. We have developed "A construction method for hydraulic extrusion pile composite foundation" (ZL2005100426965) to achieve noise-free and environmentally friendly construction. The rotary extrusion hole-making process has been recognized and promoted in the local regulations on construction projects revised in 2023.

[0003] However, during the implementation of the ZL2005100426965 technology, we also found several major defects that need to be improved:

[0004] First, the use of hydraulic drive limits the promotion of the rotary extrusion hole-making process. All construction teams are equipped with electricians, but there is a lack of personnel familiar with the maintenance of hydraulic equipment. It is imperative to develop the structure of the hydraulically driven rotary extrusion drill bit into an electric drive.

[0005] Secondly, although rotary extrusion drilling is quiet, it consumes huge amounts of energy, especially after the motor frequency conversion and speed change, a very high-power motor must be used to drive the rotary extrusion drill bit. Many construction sites cannot meet the power supply requirements of the rotary extrusion drive motor and have to use high-power generators to supply power, resulting in higher construction costs for these construction sites using rotary extrusion drilling methods.

[0006] Thus, it is imperative to reduce the resistance of the soil layer to the blades during rotary extrusion drilling, thereby reducing the power of the rotary drilling rig driving motor.

[0007] Some people have adopted the method of guiding the hole before rotary drilling, which has successfully reduced the rotary extrusion resistance and increased the hole-making speed. However, this method requires more equipment investment and affects the effect of eliminating wetting. For this reason, we have taken a different approach and adopted a method of lubricating the rotary extrusion drill bit, which effectively and significantly reduces the resistance of the blades during rotary extrusion drilling, thereby greatly increasing the hole-making speed, and also significantly reducing the power of the drive motor.

[0008] It must be pointed out that our repeated practices have proved that the method of adding water to lubricate the blades must be precise, and the amount of water added must be properly combined with the moisture content of the soil layer, the pile diameter, the pile length, etc. Otherwise, adding water will seriously affect the engineering quality of the soil-squeezing piles.

[0009] There is another problem in the original technical solution ZL200500426965, that is, when squeezing soil to form a hole, the soil in the pile hole cannot be squeezed into the surrounding hole wall, and a considerable part of the soil that has not been squeezed densely is always taken out of the hole by the drill bit. This is caused by the unreasonable design of the original drill bit. When the original drill bit drills into the soil layer, the reverse thread blades on the upper part of the drill bit press the soil into the hole to prevent the loose soil from being taken out of the hole. However, since the outer diameter of the reverse thread blades on the upper end of the drill bit is much smaller than the hole diameter, this part of the blades actually does not play the expected role. Instead, a large amount of loose soil is taken out of the hole when the drill is lifted, reducing construction efficiency. This is a design error and should be corrected. Summary of the invention

[0010] An improved method and device for squeezing soil pile construction consists of a rotary extrusion drill bit, a hollow drill rod, a power head, and a self-propelled pile frame, characterized in that the rotary extrusion drill bit is thick in the middle and thin at both ends, and is shaped like a jujube pit. Both ends are equipped with spiral blades with opposite rotation directions. The spiral blades at the lower end are very narrow and have equal widths. The spiral blades at the upper end gradually widen from narrow to wide so that the outer diameter of the blades is always equal to the diameter of the pile hole. The power head installed at the upper end of the drill rod is driven by a motor frequency converter or through a reducer or a hydraulic motor. The top of the hollow drill rod is equipped with a water injector that can inject water, mortar, or concrete. The drill tip of the rotary extrusion drill bit is an openable valve. The water injector is controlled by a computer, and the water injection amount and water injection time are determined by the computer according to the soil moisture content, pile length, and pile diameter, and precise water injection lubrication and intelligent construction are performed. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is the whole machine diagram of rotary extruder

[0012] Figure 2 It is an improved rotary drill bit.

[0013] In the figure, 1. rotary drill bit, 2. hollow drill rod, 3. power head (motor frequency conversion or driven by reducer or hydraulic motor), 4. water injector (computer program controlled), 5. self-propelled pile frame, 6. drill tip (valve). DETAILED DESCRIPTION

[0014] We introduce with the attached pictures: Figure 2 It can be seen that the structure of the rotary drill bit is thin at both ends and thick in the middle. The lower end is forced into the soil layer under pressure, and the soil in the middle section is forced into the hole wall and stabilized in the hole wall. The diameter of the upper threaded reverse blade is equal to the hole diameter, preventing the loose soil in the hole from escaping out of the hole.

[0015] During this process, the water injector injects water to lubricate the blades, reducing the friction between the blades and the soil layer and reducing the energy consumed by squeezing the soil to form holes. The amount of water injected and the time of water injection are determined by the computer according to the moisture content of the soil layer and the pile diameter and length, which enables precise water injection and intelligent construction.

[0016] After the hole is formed by squeezing the soil, the filler is filled into the hole in layers and compacted in layers and sections. The filler composition (plain soil, ash soil, ballast soil, concrete) or pumping fluid materials are all controlled and executed by the computer according to the preset program, and records are made according to the hole number for future reference.

[0017] Intelligent construction and precise water injection and lubrication not only reduce energy consumption, but also prevent quality accidents caused by excessive water injection.

Claims

1. An improved method and device for squeezing soil pile construction, which is composed of a rotary extrusion drill bit, a hollow drill rod, a power head, and a self-propelled pile frame, and is characterized by: The rotary extrusion drill bit is thick in the middle and thin at both ends, shaped like a date pit. Both ends are equipped with spiral blades, but the rotation directions are opposite. The spiral blades at the lower end are very narrow and have the same width, while the width of the spiral blades rotating in the opposite direction at the upper end gradually increases from narrow to wide. The outer diameter of the blade is always equal to the extruded hole diameter. The power head installed at the upper end of the hollow drill rod is driven by a motor frequency converter or through a reducer or a hydraulic motor. A water injector is installed at the top of the hollow drill rod. The drill tip of the rotary extrusion drill bit is an openable valve.

2. An improved soil-squeezing pile construction method and device as claimed in claim 1, characterized in that The water injector is controlled by a computer. The water injection amount and time are determined by the computer according to the moisture content of the soil layer, the pile length and the pile diameter, so as to implement precise water injection lubrication and intelligent construction.

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