Auxiliary steel sheet pile hole guiding device

Abstract

An auxiliary steel sheet pile hole guiding device comprises a spiral drilling machine with a spiral drilling rod, a high-pressure water spraying pipe is arranged in the spiral drilling rod, and a plurality of water spraying openings communicated with the high-pressure water spraying pipe are formed in a drill bit at the lower end of the spiral drilling rod; a high-pressure water spraying pipe is arranged in a spiral drill rod, and a plurality of water spraying openings communicated with the high-pressure water spraying pipe are formed in the front end of the spiral drill rod; sandy soil at different depths in the whole designed elevation is impacted through water spraying in the drilling process, so that a hard soil layer becomes loose, and after hole guiding construction is completed, the steel sheet pile can be smoothly installed to the designed position and depth through driving. The technical problems that in the steel sheet pile construction process, impact is difficult under unfavorable geological conditions, the driving quality is poor, the position deviates, locking openings are meshed, installation is not in place and the like are effectively solved, the construction efficiency can be greatly improved, and the steel sheet pile construction process is rapid, accurate, safe, efficient and economical.

Description

Technical Field

[0001] This utility model belongs to the field of engineering construction technology, and specifically relates to an auxiliary steel sheet pile pre-hole device. Background Technology

[0002] Currently, sheet piles are a commonly used foundation support material in municipal engineering foundation and subgrade construction due to their high bearing capacity and ease of construction. However, when the geological conditions are poor, the geological environment is complex, or the soil layer is hard, the machinery used for driving sheet piles using vibration or impact methods may not be able to successfully install the sheet piles to the design elevation. In such cases, it is necessary to first drill pilot holes. When encountering hard and complex soil layers, the auger drill rod may not be able to penetrate easily, requiring multiple repeated pilot hole operations. This leads to low construction efficiency, positional deviations, rework, further impacting the construction period, and generating a series of problems such as increased labor and machinery costs. Summary of the Invention

[0003] To address the problems existing in the above-mentioned background technology, this utility model provides an auxiliary steel sheet pile pre-hole device, which effectively solves the installation problem when encountering adverse geological conditions during the steel sheet pile driving process, thereby achieving the purpose of improving construction efficiency, saving construction time and construction costs.

[0004] The technical solution adopted by this utility model is: an auxiliary steel sheet pile pre-hole device, including a spiral drilling machine with a spiral drill rod, a high-pressure water jet pipe is provided inside the spiral drill rod, and multiple water jets connected to the high-pressure water jet pipe are provided on the drill bit of the spiral drill rod; a rotary joint is provided at the upper end of the high-pressure water jet pipe and a high-pressure water pump is connected through the rotary joint.

[0005] Furthermore, the high-pressure water jet pipe is located at the axis of the auger drill rod, which makes it easier to install and assemble the high-pressure water jet pipe with the rotary joint.

[0006] Furthermore, the inner diameter of the high-pressure water spray pipe is 20mm to 50mm.

[0007] Furthermore, the diameter of the water spray nozzle is 3mm to 8mm.

[0008] Furthermore, the nozzle has a conical cross-section, which can reduce nozzle blockage during drilling and increase water pressure.

[0009] Furthermore, the high-pressure water pump is connected to a frequency converter control device, which can adjust the water pressure at the nozzle according to the needs of the drilling process on site. The water pressure adjustment range is 0.1 MPa to 3.0 MPa.

[0010] The beneficial effects of this utility model are as follows: The spiral drill rod of this utility model is equipped with a high-pressure water jet pipe, and the front end of the spiral drill rod is equipped with multiple water jets connected to the high-pressure water jet pipe; it can open pilot holes when steel sheet pile construction is carried out under relatively hard geological conditions. The water pressure of the water jets can be adjusted according to different geological conditions. Initially, a smaller water pressure is used, and then the pressure is gradually increased to impact the hard strata containing rock pebbles and other difficult-to-drive steel sheet piles, and to impact sandy soil to loosen it, thereby reducing the resistance of the soil to the drilling of the spiral drill rod, so that the spiral drill rod can be continuously pressed into the soil to drill to the design elevation, and the pilot hole is formed by drilling through the spiral drill rod. Meanwhile, by spraying water during the drilling process, the sand and soil at different depths within the entire design elevation are impacted, making the hard soil layer loose. After the pilot hole construction is completed, the steel sheet piles can be successfully installed to the design position and depth by driving. This effectively solves the technical problems encountered in the construction of steel sheet piles under adverse geological conditions, such as poor driving quality, difficulty in insertion, position deviation, interlocking, and incomplete installation of steel sheet piles. The pilot hole construction of this device has a high success rate, which can greatly improve the construction efficiency and realize the construction process of steel sheet piles quickly, accurately, safely, efficiently, and economically. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the hole-forming device of this utility model;

[0012] Figure 3 This is a schematic diagram of the spiral drill rod structure of this utility model;

[0013] Figure 2 This is a top view of the drill bit of this utility model.

[0014] Components shown in the diagram: 1-Auger drill, 2-High-pressure water jet pipe, 20-Rotary joint, 3-High-pressure water pump, 4-Auger rod, 40-Water jet nozzle, 41-Drill bit. Detailed Implementation

[0015] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0016] Please see Figures 1 to 3The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "left," "right," "middle," "lower end," and "upper end" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0017] like Figures 1 to 3 As shown, an auxiliary steel sheet pile pre-hole device includes a spiral drill 1 with a spiral drill rod 4, a high-pressure water jet pipe 2 is provided inside the spiral drill rod 4, and a plurality of water jet nozzles 40 connected to the high-pressure water jet pipe 2 are provided on the drill bit 41 of the spiral drill rod 4; a rotary joint 20 is provided at the upper end of the high-pressure water jet pipe 2, and a high-pressure water pump 3 is connected through the rotary joint 20.

[0018] In this embodiment, the high-pressure water jet pipe 2 is located at the axis of the spiral drill rod 4, which makes it easier for the high-pressure water jet pipe 2 to be installed and fitted with the rotary joint 20.

[0019] The inner diameter of the high-pressure water spray pipe 2 is 20mm to 50mm.

[0020] The diameter of the water nozzle 40 is 3mm to 8mm.

[0021] The nozzle 40 has a conical cross-section, which can reduce clogging of the nozzle 40 during the drilling process.

[0022] The high-pressure water pump 3 is connected to a frequency converter control device, which can adjust the water pressure of the nozzle 40 according to the needs of the drilling process on site. The water pressure adjustment range is 0.1Mpa~3.0Mpa.

[0023] During the implementation process, after the auger drill rig 1 is in place, the upper end of the high-pressure water jet pipe 2 is connected to the high-pressure water pump 3 through the rotary joint 20. During the drilling process, the high-pressure water pump 3 is turned on, and the high-pressure water flow is sprayed out through the high-pressure water jet pipe 2 built into the auger drill rod 4 and the water jet nozzle 40 on the drill bit 41. Depending on different geological conditions, the water jet pressure is adjusted by the frequency conversion control device connected to the high-pressure water pump 3. Initially, a smaller water pressure is used, and then the water jet pressure is gradually increased to impact the hard strata containing rock pebbles and other materials that are difficult to drive steel sheet piles into. The high-pressure water jet impacts the sand and soil, making it loose and reducing the resistance of the auger drill rod 4 in drilling. This allows the auger drill rod 4 to continuously drill into the soil layer. After drilling to the design elevation, the auger drill rod 4 is pulled out, thus forming the pilot hole.

[0024] During the drilling process, continuous high-pressure water jetting impacts the sand and soil at different depths within the designed elevation, loosening the hard soil layer. After the pilot hole is completed, sheet pile driving can proceed along the pilot hole location. Subsequent driving can smoothly install the sheet piles to the designed position and depth. This effectively solves technical problems encountered in sheet pile construction, such as difficulty in impact under adverse geological conditions, poor driving quality, interlocking, and improper installation. This device can greatly improve construction efficiency and achieve fast, accurate, safe, efficient, and economical sheet pile construction.

Claims

1. An auxiliary sheet pile pre-hole drilling device, comprising a spiral drilling rig (1) with a spiral drill rod (4), characterized in that, The spiral drill rod (4) is equipped with a high-pressure water jet pipe (2), and the drill bit (41) of the spiral drill rod (4) is equipped with multiple water jets (40) that communicate with the high-pressure water jet pipe (2); the upper end of the high-pressure water jet pipe (2) is equipped with a rotary joint (20), and a high-pressure water pump (3) is connected through the rotary joint (20). The high-pressure water jet pipe (2) is located at the axis of the spiral drill rod (4); The inner diameter of the high-pressure water spray pipe (2) is 20 mm to 50 mm; The diameter of the water nozzle (40) is 3mm to 8mm; The spray nozzle (40) has a conical cross-section.

2. The auxiliary sheet pile pre-hole device according to claim 1, characterized in that, The high-pressure water pump (3) is connected to a frequency converter.

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