A method for drilling a hole in a pile foundation on a sea embankment twist king block
By employing a core drilling rig and hydraulic splitting and crushing method on the seawall torsion block, the construction risks caused by large pores in pile foundation construction were solved, achieving safe, fast, and precise hole formation, which is suitable for complex environments.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CCCC THIRD HARBOR ENGINEERING CO LTD
- Filing Date
- 2026-05-22
- Publication Date
- 2026-07-10
AI Technical Summary
When carrying out pile foundation construction on the existing building's tortuous blocks, the large and compact pores result in a large amount of construction work and can easily cause adjacent tortuous blocks to shift or collapse, affecting construction safety and quality.
The method of drilling with a core drill, hydraulic splitting and crushing, and forming holes with steel casing is adopted. The core drill is used to drill out rock cores, the hydraulic splitter is used to generate stress to split the rock, and the steel casing is used to fix it to ensure the stability of the hole wall.
It enables safe and rapid hole formation without vibration or shock waves, reduces construction noise and dust, improves construction accuracy and hole quality, and is suitable for complex environments.
Smart Images
Figure CN122358970A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a method for drilling and forming holes for pile foundations on seawall twisted blocks. Background Technology
[0002] With the continuous development of my country's economy, cast-in-place piles are a foundation treatment technology that forms pile foundations by drilling holes in the ground and pouring concrete into them, thereby enhancing the bearing capacity and stability of the foundation. This technology is widely used in wharf engineering, especially in foundation construction that requires bearing heavy loads or is carried out under complex geological conditions. When this project is carried out on existing torsion blocks, the torsion blocks have large pores and are tightly assembled. During the construction of the cast-in-place pile foundation, the removal of the pile positions involves a large amount of work and can easily cause adjacent torsion blocks to shift or collapse, affecting subsequent construction.
[0003] Therefore, a method for drilling holes for pile foundations on seawall twist blocks is provided. Summary of the Invention
[0004] To address the aforementioned problems in the existing technology, this invention provides a method for drilling pile foundations on seawall torsion blocks. By core sampling and segmenting the existing seawall torsion block components, the pile foundation project can be completed safely, quickly, and with high quality without vibration or shock waves.
[0005] The technical solution to achieve the above objectives is: A method for drilling and forming holes for pile foundations on seawall torsion blocks includes: Step S1, Drilling point measurement and layout: Establish a three-dimensional digital terrain model according to the design drawings, and use a total station to accurately locate the center point of the borehole in the central area surrounded by the torsion block. Use anti-corrosion marking nails to mark the center point of the borehole, and verify the position by the crosshair method. Step S2, core drilling: Using a core drilling machine with a diameter of 150mm, a vertical hole is drilled at the marked center point. After reaching the designed depth, a cylindrical rock core with a height of about 600mm is extracted, and a free face with a diameter of ≥1.8m is formed. Step S3, hydraulic splitting and crushing: Drill wedge holes in the residual rock mass, insert 40Cr alloy steel wedges, and use a hydraulic splitter to apply impact load, simultaneously generating vertical tensile stress and horizontal shear stress to achieve directional fracturing, dividing the rock in the central area into small pieces; Step S4, rock removal and pile position correction: Use long-arm clamps to remove the split rock blocks, repeat the steps S2-S3 until the designed hole depth and diameter are achieved, and trim the hole wall to make the hole shape regular, the hole wall stable, and the hole bottom flat. Step S5, Precise installation of steel casing: Using a total station to guide the lowering of the pre-fabricated steel casing, hoist it to the borehole opening, lower it to the design elevation, and then fill the annular gap with quick-setting mortar to fix it.
[0006] Preferably, step S1 includes: Step S11: Use a handheld LiDAR scanner to perform point cloud modeling on the twisted block area, generate a three-dimensional digital terrain model, and mark the hot spots of steel reinforcement distribution. Step S12: By linking the total station with the three-dimensional digital terrain model, the optimal pile position is automatically calculated, and the center point of the borehole is marked with anti-corrosion marking nails. Step S13: Arrange high-strength nylon crosshairs and use an electronic inclinometer to check the orthogonality of the crosshairs and verify their positions.
[0007] Preferably, in step S2, the coring drill is equipped with an automatic deviation correction system for real-time monitoring of borehole deviation, and the drill bit of the coring drill integrates a miniature CT sensor for real-time analysis of the core mineral composition and dynamic adjustment of the drilling parameters of the coring drill. The automatic deviation correction system consists of an IMU and a GNSS, and the drilling parameters are controlled as follows: rotation speed 200-300 rpm, feed pressure 5-8 kN, and mud specific gravity 1.2-1.5.
[0008] Preferably, step S2 includes: Step S21: The hydraulic outriggers of the core drilling rig are used to automatically adjust the levelness and start the automatic deviation correction system. Step S22: Start the coring drill, drill vertically at the marked center point, and analyze the rock core composition in real time using a micro CT sensor to dynamically adjust the drilling parameters of the coring drill. Step S23: After drilling to the designed depth, a cylindrical rock core with a height of about 600mm is taken out, and a free face with a diameter of ≥1.8m is formed.
[0009] Preferably, in step S3, before hydraulic splitting and crushing, the rock mass is preheated for 15-30 seconds by a microwave radiation device to reduce the tensile strength of the rock mass. The wedge holes are arranged radially, and the splitting direction is preset to the weak surface of the torsion block joint; and stress sensors are configured to monitor the fracture development process in real time.
[0010] Preferably, step S3 includes: Step S31, Microwave pre-splitting treatment: The rock mass is preheated for 15-30 seconds using a microwave radiation device to raise the surface temperature of the rock mass. Step S32: The wedge hole is automatically drilled by the robotic arm and a 40Cr alloy steel wedge is inserted. Step S33: Apply impact load using a hydraulic rock splitter to simultaneously generate vertical tensile stress and horizontal shear stress to achieve directional fracturing and divide the rock in the central area into small pieces.
[0011] Preferably, in step S4, after the split rock blocks are removed using a long-arm clamp, the rock blocks are converted into coarse aggregate using a mobile crushing and screening machine, which is used as raw material for mortar preparation in step S5.
[0012] Preferably, in step S5, vertically arranged carbon nanotubes are embedded inside the steel casing.
[0013] Preferably, in step S5, after the steel casing is installed, an ultrasonic wall gauge is installed inside the casing to continuously monitor the stability of the borehole wall for 24 hours, and anti-buoyancy anchors are welded to the outside of the steel casing to enhance its resistance to wave forces.
[0014] Compared with the prior art, the beneficial effects of the present invention are: 1) This invention has a fast construction progress, reduces the amount of construction work, and can save construction time. At the same time, it solves the problem that existing buildings are close to chemical zones and blasting excavation is not allowed during construction. 2) This invention is safe and environmentally friendly. It has minimal impact on nearby buildings and pipelines in the absence of vibration and shock waves, making it particularly suitable for construction in complex environments. 3) The present invention has high hole quality, precise positioning, and small over-excavation, which can effectively guarantee the bearing area of the pile foundation; 4) This invention produces less noise and dust, and compared with other rock excavation methods such as pneumatic picks, noise and dust are effectively controlled; 5) This invention is highly adaptable and applicable to rocks of various hardness (such as granite, limestone, etc.) and reinforced concrete structures. Attached Figure Description
[0015] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a flowchart of a method for drilling and forming holes for pile foundations on a seawall twisted block according to the present invention; Figure 2 This is a schematic diagram of the drilling process for pile foundations on the seawall twisted block in this invention; Figure 3 This is a flowchart illustrating the specific process of borehole location measurement and layout in this invention. Figure 4 This is a flowchart illustrating the specific process of core drilling in this invention; Figure 5 This is a flowchart illustrating the specific process of hydraulic splitting and crushing in this invention. Detailed Implementation
[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0017] like Figure 1 , 2 As shown, a method for drilling holes for pile foundations on a seawall torsion block includes: Step S1, Drilling point measurement and layout: Establish a three-dimensional digital terrain model according to the design drawings, and use a total station to accurately locate the center point of the borehole in the central area enclosed by the torsion block. Use anti-corrosion marker nails to mark the center point of the borehole, and verify the position by the crosshair method.
[0018] like Figure 3 As shown, step S1 specifically includes: Step S11: Use a handheld LiDAR scanner to perform point cloud modeling on the twisted block area, generate a three-dimensional digital terrain model, and mark the hot spots of steel reinforcement distribution. Step S12: By linking the total station with the three-dimensional digital terrain model, the optimal pile position is automatically calculated, and the center point of the borehole is marked with anti-corrosion marking nails. Step S13: Arrange high-strength nylon crosshairs and use an electronic inclinometer to check the orthogonality of the crosshairs and verify their positions.
[0019] Step S2, core drilling: Using a core drilling machine with a diameter of 150mm, a vertical hole is drilled at the center point of the mark. After reaching the designed depth, a cylindrical rock core with a height of about 600mm is taken out, and a free face with a diameter of ≥1.8m is formed.
[0020] In this embodiment, the coring drill is equipped with an automatic deviation correction system for real-time monitoring of borehole deviation, and the drill bit of the coring drill integrates a miniature CT sensor for real-time analysis of the core mineral composition and dynamic adjustment of the drilling parameters of the coring drill. The automatic deviation correction system consists of an IMU and a GNSS, and the drilling parameters are controlled as follows: rotation speed 200-300 rpm, feed pressure 5-8 kN, and mud specific gravity 1.2-1.5.
[0021] like Figure 4 As shown, step S2 specifically includes: Step S21: The hydraulic outriggers of the core drilling rig are used to automatically adjust the levelness and start the automatic deviation correction system. Step S22: Start the coring drill, drill vertically at the marked center point, and analyze the rock core composition in real time using a micro CT sensor to dynamically adjust the drilling parameters of the coring drill. Step S23: After drilling to the designed depth, a cylindrical rock core with a height of about 600mm is taken out, and a free face with a diameter of ≥1.8m is formed.
[0022] Step S3, hydraulic splitting and crushing: Drill wedge holes in the residual rock mass, insert 40Cr alloy steel wedges, and use a hydraulic splitter to apply impact load, simultaneously generating vertical tensile stress and horizontal shear stress to achieve directional fracturing, dividing the rock in the central area into small pieces.
[0023] In this embodiment, before hydraulic splitting and crushing, the rock mass is preheated for 15-30 seconds by a microwave radiation device to reduce the tensile strength of the rock mass. The wedge holes are arranged radially, and the splitting direction is preset to the weak surface of the torsion block joint; and stress sensors are configured to monitor the fracture development process in real time.
[0024] like Figure 5 As shown, step S3 specifically includes: Step S31, Microwave pre-splitting treatment: The rock mass is preheated for 15-30 seconds using a microwave radiation device to raise the surface temperature of the rock mass. Step S32: The wedge hole is automatically drilled by the robotic arm and a 40Cr alloy steel wedge is inserted. Step S33: Apply impact load using a hydraulic rock splitter to simultaneously generate vertical tensile stress and horizontal shear stress to achieve directional fracturing and divide the rock in the central area into small pieces.
[0025] Step S4, rock removal and pile position correction: Use long-arm clamps to remove the split rock blocks, repeat steps S2-S3 until the designed hole depth and diameter are achieved, and trim the hole wall to make the hole shape regular, the hole wall stable, and the hole bottom flat.
[0026] In this embodiment, after the split rock blocks are removed using a long-arm clamp, they are converted into coarse aggregate by a mobile crushing and screening machine, which is used as raw material for mortar preparation in step S5.
[0027] Step S5, Precise installation of steel casing: Using a total station to guide the lowering of the pre-fabricated steel casing, hoist it to the borehole opening, slowly and vertically lower it to the design elevation, and then fill the annular gap with quick-setting mortar to fix it.
[0028] In this embodiment, vertically arranged carbon nanotubes are embedded inside the steel casing to improve its bending stiffness.
[0029] In this embodiment, after the steel casing is installed, an ultrasonic wall gauge is installed inside the casing to continuously monitor the stability of the borehole wall for 24 hours, and anti-buoyancy anchors are welded to the outside of the steel casing to enhance its resistance to wave forces.
[0030] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A method for drilling and forming holes for pile foundations on a seawall twisted block, characterized in that, include: Step S1, Drilling point measurement and layout: Establish a three-dimensional digital terrain model according to the design drawings, and use a total station to accurately locate the center point of the borehole in the central area surrounded by the torsion block. Use anti-corrosion marking nails to mark the center point of the borehole, and verify the position by the crosshair method. Step S2, core drilling: Using a core drilling machine with a diameter of 150mm, a vertical hole is drilled at the marked center point. After reaching the designed depth, a cylindrical rock core with a height of about 600mm is extracted, and a free face with a diameter of ≥1.8m is formed. Step S3, hydraulic splitting and crushing: Drill wedge holes in the residual rock mass, insert 40Cr alloy steel wedges, and use a hydraulic splitter to apply impact load, simultaneously generating vertical tensile stress and horizontal shear stress to achieve directional fracturing, dividing the rock in the central area into small pieces; Step S4, rock removal and pile position correction: Use long-arm clamps to remove the split rock blocks, repeat the steps S2-S3 until the designed hole depth and diameter are achieved, and trim the hole wall to make the hole shape regular, the hole wall stable, and the hole bottom flat. Step S5, Precise installation of steel casing: Using a total station to guide the lowering of the pre-fabricated steel casing, hoist it to the borehole opening, lower it to the design elevation, and then fill the annular gap with quick-setting mortar to fix it.
2. The method for drilling and forming holes for pile foundations on a seawall twist as described in claim 1, characterized in that, Step S1 includes: Step S11: Use a handheld LiDAR scanner to perform point cloud modeling on the twisted block area, generate a three-dimensional digital terrain model, and mark the hot spots of steel reinforcement distribution. Step S12: By linking the total station with the three-dimensional digital terrain model, the optimal pile position is automatically calculated, and the center point of the borehole is marked with anti-corrosion marking nails. Step S13: Arrange high-strength nylon crosshairs and use an electronic inclinometer to check the orthogonality of the crosshairs and verify their positions.
3. The method for drilling and forming holes for pile foundations on a seawall twist as described in claim 1, characterized in that, In step S2, the coring drill is equipped with an automatic deviation correction system to monitor borehole deviation in real time, and the drill bit of the coring drill integrates a miniature CT sensor to analyze the mineral composition of the rock core in real time and dynamically adjust the drilling parameters of the coring drill. The automatic deviation correction system consists of an IMU and a GNSS, and the drilling parameters are controlled as follows: rotation speed 200-300 rpm, feed pressure 5-8 kN, and mud specific gravity 1.2-1.
5.
4. The method for drilling and forming holes for pile foundations on a seawall twist as described in claim 3, characterized in that, Step S2 includes: Step S21: The hydraulic outriggers of the core drilling rig are used to automatically adjust the levelness and start the automatic deviation correction system. Step S22: Start the coring drill, drill vertically at the marked center point, and analyze the rock core composition in real time using a micro CT sensor to dynamically adjust the drilling parameters of the coring drill. Step S23: After drilling to the designed depth, a cylindrical rock core with a height of about 600 mm is taken out, and a free face with a diameter of ≥1.8 m is formed.
5. The method for drilling and forming holes for pile foundations on a seawall twist as described in claim 1, characterized in that, In step S3, before hydraulic splitting and crushing, the rock mass is preheated for 15-30 seconds by a microwave radiation device to reduce the tensile strength of the rock mass. The wedge holes are arranged radially, and the splitting direction is preset to the weak surface of the torsion block joint; and stress sensors are configured to monitor the fracture development process in real time.
6. The method for drilling and forming holes for pile foundations on a seawall twist as described in claim 5, characterized in that, Step S3 includes: Step S31, Microwave pre-splitting treatment: The rock mass is preheated for 15-30 seconds using a microwave radiation device to raise the surface temperature of the rock mass. Step S32: The wedge hole is automatically drilled by the robotic arm and a 40Cr alloy steel wedge is inserted. Step S33: Apply impact load using a hydraulic rock splitter to simultaneously generate vertical tensile stress and horizontal shear stress to achieve directional fracturing and divide the rock in the central area into small pieces.
7. The method for drilling and forming holes for pile foundations on a seawall twist as described in claim 1, characterized in that, In step S4, after removing the split rock blocks using a long-arm clamp, the rock blocks are converted into coarse aggregate using a mobile crushing and screening machine, which is used as raw material for mortar preparation in step S5.
8. The method for drilling and forming holes for pile foundations on a seawall twist as described in claim 1, characterized in that, In step S5, vertically arranged carbon nanotubes are embedded inside the steel casing.
9. A method for drilling and forming holes for pile foundations on a seawall twist as described in claim 1, characterized in that, In step S5, after the steel casing is installed, an ultrasonic wall gauge is installed inside the casing to continuously monitor the stability of the borehole wall for 24 hours, and anti-buoyancy anchors are welded to the outside of the steel casing to enhance its resistance to wave forces.