Multi-shaft coupling type cement mixing pile construction equipment and synchronous construction method

Abstract

The invention belongs to the technical field of building foundation treatment, and particularly relates to multi-shaft coupling type cement mixing pile construction equipment and a synchronous construction method.The multi-shaft coupling type cement mixing pile construction equipment comprises a multi-shaft coupling stirring system and a semi-automatic regulation and control module, the multi-shaft coupling stirring system comprises a plurality of drill rods which are arranged in parallel and are in meshed transmission, and staggered spiral blades are arranged on the surfaces of the drill rods; the phase difference between adjacent spiral blades is 60 degrees, a multi-parameter sensor set is integrated at the end of the drill rod and comprises a soil pressure sensor and a mechanical deflection instrument, the semi-automatic regulation and control module comprises a physical dial switch and a mechanical interlocking regulation mechanism, the physical dial switch is used for switching preset four-gear working condition modes, and the mechanical interlocking regulation mechanism is used for controlling the mechanical interlocking regulation mechanism. And the four working condition modes comprise a soft soil mode, a hard soil mode, a sand layer mode and a gravel mode. The method has the beneficial effects that the pile forming quality is good, the construction efficiency is high, and the maintenance cost is low.

Description

Technical Field

[0001] This invention relates to the field of building foundation treatment technology, specifically to a multi-axis coupled cement mixing pile construction equipment and synchronous construction method. Background Technology

[0002] Cement mixing piles are a commonly used technique in building foundation treatment. They involve mixing cement slurry with the foundation soil to form piles with a certain strength, thereby improving the bearing capacity of the foundation. However, traditional cement mixing pile construction equipment and methods have many shortcomings.

[0003] Regarding mixing uniformity, traditional single-shaft mixing equipment struggles to fully break up soil in hard soil layers, easily forming unbroken "sandwich layers" and resulting in significant dispersion in pile strength. According to JGJ79-2012 "Code for Design of Building Foundation Treatment," pile strength dispersion should be ≤15%, but pile strength dispersion using traditional single-shaft mixing equipment often exceeds 25%, failing to meet the code's requirements. Regarding multi-shaft coordination, existing dual-shaft and other multi-shaft equipment has not effectively addressed the issue of balanced drill rod torque distribution, leading to asynchronous operation of drill rods during construction. This not only affects pile quality but also results in a high equipment failure rate, generally >8%, increasing construction costs and schedule risks. Summary of the Invention

[0004] The present invention addresses the problems mentioned above by designing a multi-axis coupled cement mixing pile construction equipment and synchronous construction method to overcome the deficiencies of the existing technology.

[0005] To achieve the above objectives, the present invention provides a multi-axis coupled cement mixing pile construction device, including a multi-axis coupled mixing system and a semi-automatic control module. The multi-axis coupled mixing system includes multiple parallel and meshing drill rods. The surface of the drill rods is provided with staggered helical blades, and the phase difference between adjacent helical blades is 60°. A multi-parameter sensor group is integrated at the end of the drill rods, including an earth pressure sensor and a mechanical deflectometer.

[0006] Furthermore, the multi-axis coupled stirring system also includes a gearbox and a hydraulic motor, the hydraulic motor driving the gearbox, and the multiple drill rods being synchronously meshed and transmitted through the gearbox.

[0007] Furthermore, the semi-automatic control module includes a physical DIP switch and a mechanical interlocking adjustment mechanism. The physical DIP switch is used to switch between four preset working conditions, namely soft soil mode, hard soil mode, sand layer mode, and gravel mode.

[0008] Furthermore, the mechanical interlocking adjustment mechanism is used to adjust the slurry flow rate according to the drill pipe torque.

[0009] This invention also includes a synchronous construction method for a multi-axis coupled cement mixing pile construction device, comprising the following steps: Step 1: Preparations before construction; Step 2: Equipment positioning. Move the multi-axis coupled mixing system to the designated construction location, adjust the equipment position to align it with the pile position, and ensure that the equipment is placed stably. Step 3: Start the equipment and initialize the parameters. Check the operating status of each system. The multi-parameter sensor group starts working, the hydraulic motor provides power, and the mechanical synchronous gearbox starts, ensuring that the speed deviation of multiple drill pipes is <2%. Step 4: Drilling Construction, Normal Drilling: The equipment begins drilling according to the preset mode. Mechanical synchronization control achieves three-axis rigid transmission through the gearbox. The slurry flow rate is adjusted according to the drill rod torque via a mechanical interlocking mechanism according to the formula. To take control; Step 5: Monitoring the pile formation process, continuously monitoring construction parameters through a multi-parameter sensor group, judging the construction status, and paying attention to the pile formation; Step Six: Raise the drill rod and stir. After the drill rod has drilled to the preset depth, raise the drill rod and continue stirring to keep all parameters stable. Step 7: After the pile is completed and the drill rod is raised to the ground, stop the equipment and conduct a preliminary inspection of the pile. Step 8: Equipment relocation. Move the equipment to the next pile location and repeat the above steps to construct the next pile.

[0010] Furthermore, in step one, the pre-construction preparation includes equipment inspection, site survey and mode preset, and slurry preparation. A comprehensive inspection of the multi-axis coupled mixing system is carried out; the geological conditions of the construction site are surveyed to determine the foundation type, and the equipment is preset to the corresponding working mode through physical DIP switches; according to the construction requirements and the preset working mode, suitable slurry is prepared, and the slurry supply system is ensured to be normal.

[0011] Furthermore, in step three, the pressure of the hydraulic motor is dynamically adjusted by a mechanical feedback valve to ensure that the torque fluctuation is less than ±10%.

[0012] Furthermore, in step four, if a gravel layer is encountered during construction, the equipment is switched to impact mode. When the torque exceeds the limit, the interlocking mechanism is triggered, increasing the slurry flow rate by 25%.

[0013] Furthermore, step four also includes a correction operation. During the drilling process, the mechanical skew gauge monitors the drill rod skew in real time. When the displayed value is greater than 0.5°, the hydraulic correction valve is manually activated to correct the skew.

[0014] In summary, the present invention has the following advantages and beneficial technical effects: 1. This invention effectively solves the problem of insufficient mixing uniformity in traditional equipment by using the staggered helical blades of three parallel drill rods, the precise synchronous transmission achieved by the gearbox, and the dynamic matching of slurry flow rate and torque, thus avoiding the formation of a "sandwich layer".

[0015] 2. The multi-axis collaborative operation mode of this invention, combined with optimized construction parameters and working condition mode switching design, shortens the construction time of a single pile, significantly improves construction efficiency, and helps to shorten the construction period.

[0016] 3. The present invention solves the problem of torque balance distribution through the three-axis rigid transmission achieved by the gearbox, and the dynamic adjustment of the hydraulic motor pressure further ensures the stability of equipment operation, reduces equipment maintenance costs and the risk of project delays.

[0017] 4. This invention has four preset working modes, which can be quickly switched via a DIP switch, to adapt to the construction needs of various geological conditions such as soft soil, hard soil, sand layer, and gravel, thereby improving the versatility of the equipment and the flexibility of construction. Attached Figure Description

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the gearbox transmission in this invention.

[0019] The reference numerals in the attached figures are: 1. Drill pipe; 2. Spiral blade; 3. Gearbox; 4. Multi-parameter sensor group. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of the embodiments of this invention will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout; the described embodiments are some embodiments of this invention, but not all embodiments; the embodiments and directional terms described below with reference to the accompanying drawings are exemplary and intended to explain this invention, and should not be construed as limiting this invention; all other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention. The embodiments of this invention will be described in detail below with reference to the accompanying drawings: The following is in conjunction with the appendix Figures 1-2 The present invention will be further described in detail below: Example 1 like Figures 1-2As shown, this embodiment discloses a multi-axis coupled cement mixing pile construction equipment, including a multi-axis coupled mixing system and a semi-automatic control module. The multi-axis coupled mixing system includes three parallel and meshing drill rods 1, made of 42CrMo alloy steel. The drill rods 1 have staggered helical blades 2 on their surfaces, with a pitch of 500mm, a blade inclination angle range of 0-25°, and a phase difference of 60° between adjacent helical blades 2. A multi-parameter sensor group 4 is integrated at the end of the drill rods 1, including an earth pressure sensor and a mechanical skew gauge. The multi-axis coupled mixing system also includes a gearbox 3 and a hydraulic motor. The hydraulic motor drives the gearbox 3, and the multiple drill rods 1 achieve three-axis rigid transmission through the gearbox 3, with a speed deviation of <2%. The semi-automatic control module includes a physical DIP switch and a mechanical interlocking adjustment mechanism. The physical DIP switch is used to switch between four preset working modes: soft soil mode, hard soil mode, sand layer mode, and gravel mode. The mechanical interlocking adjustment mechanism is used to adjust the slurry flow rate according to the torque of the drill rods 1. The slurry flow rate adjustment formula is... , where K is a preset coefficient, and linear correspondence is achieved through a mechanical cam mechanism.

[0021] Example 2 The synchronous construction method of the multi-axis coupled cement mixing pile construction equipment of the present invention is as follows: Step 1: Pre-construction preparation, including equipment inspection, site survey and mode preset, and grout preparation. Conduct a comprehensive inspection of the multi-axis coupled mixing system; survey the geological conditions of the construction site to determine the foundation type, and preset the equipment to the corresponding working mode using physical DIP switches; prepare suitable grout according to construction requirements and preset working mode, and ensure that the grout supply system is normal.

[0022] Step 2: Equipment positioning. Move the multi-axis coupled mixing system to the designated construction location, adjust the equipment position to align it with the pile position, and ensure that the equipment is placed stably.

[0023] Step 3: Start the equipment and initialize the parameters. Check the operating status of each system. The multi-parameter sensor group 4 starts working. The hydraulic motor provides power. The mechanical synchronous gearbox 3 starts. Ensure that the speed deviation of the three drill rods 1 is <2%. The pressure of the hydraulic motor is dynamically adjusted by the mechanical feedback valve to make the torque fluctuation <±10%.

[0024] Step 4: Drilling Construction, Normal Drilling: The equipment begins drilling according to the preset mode. Mechanical synchronization control achieves three-axis rigid transmission through gearbox 3. The slurry flow rate is adjusted according to the torque of drill rod 1 through the mechanical interlocking mechanism according to the formula. To take control; If a gravel layer is encountered during construction, switch the equipment to impact mode. When the torque exceeds the limit, the interlocking mechanism will be triggered, increasing the slurry flow rate by 25%. During the drilling process, the mechanical skew gauge monitors the skewness of drill rod 1 in real time. When the displayed value is greater than 0.5°, the hydraulic skew valve is manually activated to correct the skewness.

[0025] Step 5: Monitoring the pile formation process, continuously monitoring construction parameters through multi-parameter sensor group 4, judging the construction status, and paying attention to the pile formation; Step 6: Raise drill rod 1 and stir. After drill rod 1 has drilled to the preset depth, raise drill rod 1 and continue stirring to keep all parameters stable. Step 7: After the pile is completed and drill rod 1 is raised to the ground, stop the equipment and conduct a preliminary inspection of the pile. Step 8: Equipment relocation. Move the equipment to the next pile location and repeat the above steps to construct the next pile.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-axis coupled cement mixing pile construction device, characterized in that: The system includes a multi-axis coupled mixing system and a semi-automatic control module. The multi-axis coupled mixing system includes multiple parallel and meshing drill rods. The surface of the drill rods is provided with staggered helical blades, and the phase difference between adjacent helical blades is 60°. The end of the drill rods integrates a multi-parameter sensor group, which includes an earth pressure sensor and a mechanical deflectometer.

2. The multi-axis coupled cement mixing pile construction equipment according to claim 1, characterized in that: The multi-axis coupled stirring system also includes a gearbox and a hydraulic motor. The hydraulic motor drives the gearbox, and the multiple drill rods are synchronously meshed and transmitted through the gearbox.

3. The multi-axis coupled cement mixing pile construction equipment according to claim 1, characterized in that: The semi-automatic control module includes a physical DIP switch and a mechanical interlocking adjustment mechanism. The physical DIP switch is used to switch between four preset working conditions: soft soil mode, hard soil mode, sand layer mode, and gravel mode.

4. The multi-axis coupled cement mixing pile construction equipment according to claim 3, characterized in that: The mechanical interlocking adjustment mechanism is used to adjust the slurry flow rate according to the drill pipe torque.

5. A synchronous construction method for a multi-axis coupled cement mixing pile construction equipment, characterized in that: The synchronous construction method of the multi-axis coupled cement mixing pile construction equipment according to claim 4 is as follows: Includes the following steps, Step 1: Preparations before construction; Step 2: Equipment positioning. Move the multi-axis coupled mixing system to the designated construction location, adjust the equipment position to align it with the pile position, and ensure that the equipment is placed stably. Step 3: Start the equipment and initialize the parameters. Check the operating status of each system. The multi-parameter sensor group starts working, the hydraulic motor provides power, and the mechanical synchronous gearbox starts, ensuring that the speed deviation of multiple drill pipes is <2%. Step 4: Drilling Construction, Normal Drilling: The equipment begins drilling according to the preset mode. Mechanical synchronization control achieves three-axis rigid transmission through the gearbox. The slurry flow rate is adjusted according to the drill rod torque via a mechanical interlocking mechanism according to the formula. To take control; Step 5: Monitoring the pile formation process, continuously monitoring construction parameters through a multi-parameter sensor group, judging the construction status, and paying attention to the pile formation; Step Six: Raise the drill rod and stir. After the drill rod has drilled to the preset depth, raise the drill rod and continue stirring to keep all parameters stable. Step 7: After the pile is completed and the drill rod is raised to the ground, stop the equipment and conduct a preliminary inspection of the pile. Step 8: Equipment relocation. Move the equipment to the next pile location and repeat the above steps to construct the next pile.

6. The synchronous construction method of a multi-axis coupled cement mixing pile construction equipment according to claim 5, characterized in that: In step one, the pre-construction preparation includes equipment inspection, site survey and mode preset, and slurry preparation. A comprehensive inspection of the multi-axis coupled mixing system is carried out; the geological conditions of the construction site are surveyed to determine the foundation type, and the equipment is preset to the corresponding working mode through physical DIP switches; according to the construction requirements and the preset working mode, appropriate slurry is prepared, and the slurry supply system is ensured to be normal.

7. The synchronous construction method of a multi-axis coupled cement mixing pile construction equipment according to claim 5, characterized in that: In step three, the pressure of the hydraulic motor is dynamically adjusted by the mechanical feedback valve to ensure that the torque fluctuation is less than ±10%.

8. The synchronous construction method of a multi-axis coupled cement mixing pile construction equipment according to claim 5, characterized in that: In step four, if a gravel layer is encountered during construction, the equipment is switched to impact mode. When the torque exceeds the limit, the interlocking mechanism is triggered, which increases the slurry flow rate by 25%.

9. The synchronous construction method of a multi-axis coupled cement mixing pile construction equipment according to claim 5, characterized in that: Step four also includes a correction operation. During the drilling process, the mechanical skew gauge monitors the drill rod skew in real time. When the displayed value is greater than 0.5°, the hydraulic correction valve is manually activated to correct the skew.

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