A branch pile reaming device and method of use thereof

Abstract

The branch pile reaming device and the use method thereof belong to the technical field of building construction, and comprise a hydraulic device and a reaming device. The hydraulic device comprises a hydraulic pump and at least one hydraulic hard pipe. The upper end of the hydraulic hard pipe is communicated with the hydraulic pump. The reaming device comprises a steel cylinder, a hydraulic conduit and elastic rubber rings. The hydraulic conduit is arranged in the steel cylinder, and the upper end of the hydraulic conduit is communicated with the lower end of the hydraulic hard pipe. The elastic rubber rings are arranged in multiple and are sequentially sleeved on the outside of the steel cylinder from top to bottom, and the multiple elastic rubber rings are respectively communicated with the multiple branch ends of the lower end of the hydraulic conduit. The geogrid is arranged on the outer periphery of the elastic rubber ring. The elastic rubber rings and the geogrid sleeved on the outer periphery of the steel cylinder can realize the reaming forming of the branch space at one time, and provide the structural strength of the branch space forming. At least one hydraulic hard pipe can be communicated with the drillings of different depths to improve the efficiency and quality of the construction operation.

Description

Technical Field

[0001] This invention belongs to the field of building construction technology, specifically a branch pile hole expansion device and its usage method. Background Technology

[0002] Conventional cast-in-place piles and precast piles have a diameter that remains basically unchanged along the length of the pile, meaning they have a constant diameter structure. The bearing capacity they provide is mainly due to the pile side resistance and pile end resistance, making it difficult to fully utilize the potential of the foundation soil.

[0003] Branch piles such as enlarged-base cast-in-place piles and rammed-enlarged piles form branch enlarged cavities at the pile tip or pile side, effectively tapping the potential of the foundation, increasing the pile tip area and pile side area, and turning a single end bearing point into multiple end bearing points, thus making full use of the side resistance and end resistance of the soil layer.

[0004] Currently, common borehole reaming equipment typically employs hydraulic robotic arms, which have complex component connections. The reaming process involves a sequence of extrusion reaming, angle rotation, and further extrusion reaming, resulting in a complex construction process. Furthermore, the continuous reaming process can easily disturb the already formed borehole wall, causing collapse. Additionally, the short processing time of the hydraulic robotic arm, coupled with the limited space within the borehole, means that the shape and size of the branch spaces created by extrusion reaming cannot meet requirements. As the hydraulic robotic arm is retracted, the branch spaces in soft soil layers shrink in diameter, while those in gravelly soil layers collapse. Summary of the Invention

[0005] To address the problems of complex equipment structure, undesirable branch space shape, and structural instability in existing equipment during the hole enlargement process, this invention provides a branch pile hole enlargement device and its usage method.

[0006] This invention is achieved, in one respect, through the following technical solution:

[0007] A branch pile hole enlargement device includes a hydraulic device and an enlargement device;

[0008] The hydraulic device includes a hydraulic pump and at least one hydraulic hard pipe; the upper end of at least one hydraulic hard pipe is connected to the hydraulic pump.

[0009] The hole-expanding device includes a steel cylinder, a hydraulic guide tube, and an elastic rubber ring;

[0010] The hydraulic conduit is disposed inside the steel cylinder, and the upper end of the hydraulic conduit is connected to the lower end of the hydraulic rigid pipe.

[0011] Multiple elastic rubber rings are provided and sequentially fitted around the outside of the steel cylinder from top to bottom, and the multiple elastic rubber rings are respectively connected to the multiple branch ends of the lower end of the hydraulic conduit; the geogrid is set on the outer periphery of the elastic rubber rings.

[0012] The elastic rubber ring and geogrid, which are fitted around the outer circumference of the steel cylinder, enable the expansion and shaping of the branch space in one step and provide structural strength for the shaping of the branch space; at least one hydraulic hard pipe can be connected to adapt to boreholes of different depths to improve the efficiency and quality of construction operations.

[0013] A further improvement of the present invention is that the side wall of the steel cylinder is provided with an annular groove corresponding to the elastic rubber ring, and the elastic rubber ring is disposed within the annular groove. The annular groove secures the position of the elastic rubber ring, preventing displacement due to lack of fixation during branch space operations.

[0014] A further improvement of the present invention is that outwardly extending anti-extrusion ring plates made of steel are provided on both the upper and lower edges of the aforementioned annular groove. These two anti-extrusion ring plates ensure the accuracy of the hole-expanding position during the hole-expanding operation of the elastic rubber ring.

[0015] A further improvement of the present invention is that the aforementioned hydraulic hard pipe is vertically disposed at the center of the top surface of the steel cylinder. By disposing the hydraulic hard pipe at the center of the steel cylinder, an operating handle is formed when the steel cylinder is lowered into the borehole via the hydraulic hard pipe.

[0016] A further improvement of the present invention is that the aforementioned hydraulic device also includes a hydraulic hose connecting the hydraulic pump and the hydraulic rigid pipe. The hydraulic hose improves the adaptability of the hydraulic pump and the hydraulic rigid pipe to the operating environment.

[0017] A further improvement of the present invention is that the aforementioned hydraulic hose is equipped with an air extraction detection valve capable of verifying the airtightness of the pipeline. This airtightness testing of the connected pipeline ensures the quality of the reaming operation.

[0018] A further improvement of the present invention is that the hydraulic hose is also equipped with a pressure control valve to prevent the elastic rubber ring from rupturing due to excessive pressure. Damage to the elastic rubber ring is avoided by using a pre-set pressure.

[0019] Another aspect of the present invention is achieved through the following technical solution:

[0020] A method for using a branch pile hole enlargement device includes the following steps:

[0021] S1. Drill holes and determine the stratigraphic distribution along the depth direction. Based on the stratigraphic conditions, determine the location of the branch space.

[0022] S2. Place the elastic rubber ring into the groove of the steel cylinder and install the geogrid on the outer periphery of the elastic rubber ring;

[0023] S3. Connect multiple hydraulic hard pipes sequentially according to the preset depth of the steel cylinder when it is lowered to the borehole;

[0024] S4. Open the air extraction test valve to test the airtightness of the pipeline;

[0025] S5. Preset the pressure of the hydraulic pump and start the hydraulic pump until the elastic rubber ring expands outward and squeezes the soil and rock to create branch space. At the same time, the geogrid is squeezed and expands outward and penetrates into the soil and rock, forming a reinforcement of the cavity wall of the branch space.

[0026] S6. After the branch space is formed, operate the hydraulic pump to depressurize and return the flow. The elastic rubber ring will shrink and recover. Repeat the above steps S1-S5 at different depths of the rock and soil to generate multiple branch spaces. After the hole is cleaned and qualified, the steel cage is lowered for pile concrete pouring.

[0027] As can be seen from the above technical solutions, the beneficial effects of the present invention are: the elastic rubber ring and geogrid fitted around the outer circumference of the steel cylinder can realize the expansion and forming of the branch space in one go, and provide structural strength for the forming of the branch space; at least one hydraulic hard pipe can be connected to boreholes of different depths to improve the efficiency and quality of construction operations. Attached Figure Description

[0028] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a structural schematic diagram of a specific embodiment of the present invention.

[0030] Figure 2 This is a schematic diagram of the extrusion section of the reaming device according to a specific embodiment of the present invention.

[0031] Figure 3 This is a top view of the hole-expanding device according to a specific embodiment of the present invention.

[0032] In the attached diagram: 10. Hydraulic device; 11. Hydraulic pump; 12. Hydraulic hose; 13. Air extraction detection valve; 14. Pressure control valve; 15. Hydraulic rigid pipe; 16. Threaded joint; 17. Hydraulic conduit; 20. Hole expansion device; 21. Steel cylinder; 22. Annular groove; 23. Annular protrusion; 24. Anti-extrusion ring plate; 25. Geogrid; 26. Spring rubber ring. Detailed Implementation

[0033] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0034] As attached Figure 1-3 As shown, a branch pile hole enlargement device includes a hydraulic device 10 and an enlargement device 20. By placing the enlargement device 20 into a pre-formed borehole, the branch space within the borehole is expanded under the action of the hydraulic device 10.

[0035] The hydraulic device 10 includes a hydraulic pump 11 and at least one hydraulic hard pipe 15; the upper end of at least one hydraulic hard pipe 15 is connected to the hydraulic pump 11. When there is more than one hydraulic hard pipe 15, adjacent hydraulic hard pipes 15 are connected by threaded joints 16. At least one hydraulic hard pipe 15 can be connected to adapt to drilling depths of different depths, thereby improving the efficiency and quality of construction operations.

[0036] The hydraulic device 10 also includes a hydraulic hose 12, which connects the hydraulic pump 11 and the hydraulic rigid pipe 15. The hydraulic hose 12 improves the adaptability of the hydraulic pump 11 and the hydraulic rigid pipe 15 to the working environment. The two ends of the hydraulic hose 12 are connected to the port of the hydraulic pump 11 and the hydraulic rigid pipe 15 respectively through threaded connectors 16.

[0037] The hydraulic hose 12 is equipped with a vacuum test valve 13 to verify the airtightness of the pipeline. This valve checks the airtightness of the connected pipeline to ensure the quality of the reaming operation.

[0038] The hydraulic hose 12 is also equipped with a pressure control valve 14 to prevent the elastic rubber ring 26 from rupturing due to excessive pressure. By setting a pre-set pressure, damage to the elastic rubber ring 26 is avoided.

[0039] The hole-expanding device 20 includes a hollow steel cylinder 21, a hydraulic conduit 17, and an elastic rubber ring 26.

[0040] The hydraulic conduit 17 is disposed inside the steel cylinder 21, and the upper end of the hydraulic conduit 17 is connected to the lower end of the hydraulic rigid pipe 15; the hydraulic rigid pipe 15 is vertically disposed at the center of the top surface of the steel cylinder 21. The hydraulic rigid pipe 15 is disposed at the center of the steel cylinder 21, so that when the steel cylinder 21 is lowered into the borehole through the hydraulic rigid pipe 15, an operating handle is formed.

[0041] The lower end of the hydraulic rigid pipe 15 is connected to the steel cylinder 21 through a threaded joint 16; one end of the hydraulic conduit 17 is connected to the lower end of the hydraulic rigid pipe 15.

[0042] Multiple elastic rubber rings 26 are provided and sequentially fitted onto the outside of the steel cylinder 21 from top to bottom. Each of the multiple elastic rubber rings 26 is connected to multiple branch ends of the lower end of the hydraulic conduit 17 via threaded joints 16. The geogrid 25 is disposed around the outer periphery of the elastic rubber rings 26. The elastic rubber rings 26 and the geogrid 25 fitted onto the outer periphery of the steel cylinder 21 achieve the expansion and forming of the branch space in one step, and provide structural strength for the branch space formation.

[0043] The elastic rubber ring 26 may be pre-installed with a certain degree of elasticity to improve the burst limit of the elastic rubber ring 26 when it expands.

[0044] The steel cylinder 21 has an annular groove 22 on its side wall corresponding to the elastic rubber ring 26, and the elastic rubber ring 26 is disposed in the annular groove 22. The annular groove 22 fixes the position of the elastic rubber ring 26, preventing displacement due to lack of fixation when working in branch spaces.

[0045] The annular groove 22 has annular protrusions welded to its upper and lower edges. Each of the upper and lower edges of the annular groove 22 is provided with an outwardly extending anti-extrusion ring plate 24 made of steel. The anti-extrusion ring plate 24 is bolted to the annular protrusion. The upper and lower anti-extrusion ring plates 24 ensure the accuracy of the hole-expanding position of the elastic rubber ring 26 during the hole-expanding operation; simultaneously, they prevent the elastic rubber ring 26 from deforming vertically, ensuring that the radial depth of the expanded hole in the branch space meets the standard.

[0046] The anti-extrusion ring plate 24 has various outer diameter specifications to meet the needs of different pile diameters; at the same time, the anti-extrusion ring plate 24 and the annular protrusions improve the convenience of replacement.

[0047] To ensure that the geogrid 25 fits snugly against the sidewalls of the branch space on the soil and rock mass, the geogrid 25 can be placed around the elastic rubber ring 26, or it can be placed between the upper and lower anti-extrusion ring plates 24 corresponding to the same annular groove 22.

[0048] A method for using a branch pile hole enlargement device includes the following steps:

[0049] S1. Drill holes and determine the stratigraphic distribution along the depth direction. Based on the stratigraphic conditions, determine the location of the branch space.

[0050] S2. Fit the elastic rubber ring 26 into the groove of the steel cylinder 21, and install the geogrid 25 on the outer periphery of the elastic rubber ring 26.

[0051] S3. According to the preset depth of the drilling hole when the steel cylinder 21 is lowered, connect multiple hydraulic hard pipes 15 in sequence;

[0052] S4. Open the air extraction test valve 13 to perform a leak test on the pipeline;

[0053] S5. Preset the pressure of hydraulic pump 11 and start hydraulic pump 11 until the elastic rubber ring 26 expands outward and squeezes the rock and soil to create branch space. At the same time, the geogrid 25 is squeezed and expands outward and penetrates into the rock and soil to strengthen the cavity wall of the branch space.

[0054] S6. After the branch space is formed, operate the hydraulic pump 11 to release pressure and return the flow. The elastic rubber ring 26 shrinks and recovers. Repeat the above steps S1-S5 at different depths of the rock and soil to generate multiple branch spaces. After the hole is cleaned and qualified, the steel cage is lowered for pile concrete pouring.

[0055] The enlargement device 20 for compression piles should preferably be installed at the junction of two soil layers with different compressibility coefficients (soft upper layer and hard lower layer), and should be located within the soil layer with the larger compressibility coefficient. Similarly, the enlargement device 20 for tension piles should preferably be installed at the junction of two soil layers with different compressibility coefficients (hard upper layer and soft lower layer), and should be located within the soil layer with the larger compressibility coefficient. This is to facilitate the expansion of the elastic rubber ring 26 within the soil layer with the larger compressibility coefficient, fully utilizing the end resistance of the hard soil layer and enhancing the lateral resistance of the soft soil layer. After being compressed, the soil density increases, its mechanical properties improve, and both end resistance and lateral resistance increase.

[0056] The present invention discloses a branch pile hole enlargement device and its usage method, which uses an elastic rubber ring and geogrid fitted around the outer circumference of a steel cylinder to achieve hole enlargement and shaping of the branch space in one step and provide structural strength for the branch space shaping; at least one hydraulic hard pipe can be connected to boreholes of different depths to improve the efficiency and quality of construction operations.

[0057] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0058] The terms "upper," "lower," "outer," "inner," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish relative positional relationships and are not necessarily qualitative. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0059] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A branch pile borehole enlargement device, characterized in that, The device includes a hydraulic unit (10) and a borehole reaming device (20); the hydraulic unit (10) includes a hydraulic pump (11) and at least one hydraulic rigid pipe (15); the upper end of at least one of the hydraulic rigid pipes (15) is connected to the hydraulic pump (11); the borehole reaming device (20) includes a steel cylinder (21), a hydraulic conduit (17), an elastic rubber ring (26), and a geogrid (25); the hydraulic conduit (17) is disposed inside the steel cylinder (21), and the hydraulic conduit (17) The upper end of the elastic rubber ring (26) is connected to the lower end of the hydraulic hard pipe (15); multiple elastic rubber rings (26) are provided and are sequentially fitted around the outside of the steel cylinder (21) from top to bottom, and the multiple elastic rubber rings (26) are respectively connected to the multiple branch ends of the lower end of the hydraulic conduit (17); the geogrid (25) is set on the outer periphery of the elastic rubber ring (26); the side wall of the steel cylinder (21) is provided with annular grooves (22) corresponding to the elastic rubber rings (26), and the elastic rubber rings (26) are connected to the lower end of the hydraulic hard pipe (15); the upper end of the elastic rubber ring (26) is connected to the lower end of the hydraulic hard pipe (15); the upper end of the elastic rubber ring (26) is connected to the lower end of the hydraulic hard pipe (15); the lower ... hard pipe (26) is connected to the lower end of the hydraulic hard pipe (15); the upper end of the elastic hard pipe (26) is connected to the lower end of the hydraulic hard pipe (15); the lower end of the elastic hard pipe (26) is connected to the lower end of the hydraulic hard pipe (15); the upper end of the elastic hard pipe (26) is connected to the lower end of the hydraulic hard pipe (15); the lower end of the elastic hard pipe (26 The rubber ring (26) is set in the annular groove (22); the upper and lower edges of the annular groove (22) are provided with outwardly extending anti-extrusion ring plates (24) made of steel; the hydraulic device (10) also includes a hydraulic hose (12), which connects the hydraulic pump (11) and the hydraulic hard pipe (15); the hydraulic hose (12) is provided with an air extraction detection valve (13) that can confirm the airtightness of the pipeline; the hydraulic hose (12) is also provided with a pressure control valve (14) that can prevent the elastic rubber ring (26) from rupturing due to excessive pressure; the anti-extrusion ring plate (24) is fastened to the annular protrusion of the steel cylinder (21) by bolts; the anti-extrusion ring plate (24) has a variety of outer diameter specifications to meet the needs of different pile diameters; the elastic rubber ring (26) is pre-set with an elastic wire mesh; the geogrid (25) is set between the upper and lower anti-extrusion ring plates (24) corresponding to the same annular groove (22).

2. The branch pile borehole enlargement device according to claim 1, characterized in that, The hydraulic hard pipe (15) is vertically installed at the center of the top surface of the steel cylinder (21).

3. A method of using the branch pile borehole enlargement device as described in claim 2, characterized in that, Includes the following steps: S1. Drill the hole and determine the geological distribution along the depth direction. Based on the geological conditions, determine the location of the branch space. S2. Place the elastic rubber ring (26) into the groove of the steel cylinder (21) and install the geogrid (25) on the outer periphery of the elastic rubber ring (26). S3. According to the preset depth of the steel cylinder (21) to the borehole, connect multiple hydraulic hard pipes (15) in sequence. S4. Open the air extraction test valve (13) to test the airtightness of the pipeline. S5. Pre-set the hydraulic pump (11). The pressure is increased and the hydraulic pump (11) is turned on until the elastic rubber ring (26) expands outward and squeezes the soil and rock to create branch spaces. At the same time, the geogrid (25) is squeezed and expands outward and penetrates into the soil and rock to reinforce the cavity wall of the branch space. S6. After the branch space is formed, the hydraulic pump (11) is operated to release pressure and return the flow. The elastic rubber ring (26) shrinks and recovers. The above steps S1-S5 are repeated at different depths of the soil and rock to create multiple branch spaces. After the hole is cleaned and qualified, the steel cage is lowered and the pile concrete is poured.

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