Screw-in type environment-friendly steel pipe pile with tip blades

Abstract

The utility model discloses a screw-in type environment-friendly steel pipe pile with tip blades, which comprises a steel pipe pile, a pile cap fixed with the steel pipe pile, and a spinning driving device for driving the steel pipe pile to rotate downwards, the pile cap is arranged at the pile back position of the steel pipe pile, and the spinning driving device drives the pile cap; a tip blade is mounted at the pile tip position of the steel pipe pile, covers the pile tip position of the steel pipe pile and comprises two semicircular steel plates; the two semicircular steel plates intersect in a V shape on the periphery of the steel pipe pile. The tip blades are semicircular steel plates and are welded on the periphery of the steel pipe pile in a V-shaped intersection manner, so that a wider stress surface can be formed when the pile tip enters a soil layer, the pressure of a soil body is dispersed, the soil body is effectively broken through through a gradual rotary cutting effect, the penetrating power of the pile is improved, and the service life of the pile is prolonged. And the situation that the construction speed is reduced or the pile body deflects due to the fact that large resistance occurs when the pile tip of the steel pipe pile makes contact with a hard soil layer is avoided.

Description

Technical Field

[0001] This utility model relates to the field of building construction technology, and in particular to a screw-in environmentally friendly steel pipe pile with a pointed blade. Background Technology

[0002] Steel pipe piles, as a common foundation engineering material, are widely used in the construction of buildings, bridges, ports, and other important facilities. Due to their high construction efficiency and minimal environmental disturbance, the screw-in construction method for steel pipe piles has gradually become a mainstream pile foundation construction method. However, traditional screw-in steel pipe piles have certain technical bottlenecks, particularly in terms of penetration force, screw-in efficiency, and disturbance to the surrounding soil under different soil conditions, and have not yet achieved optimal results.

[0003] Traditional screw-in steel pipe piles typically use ordinary steel pipe pile tip blades with relatively simple designs, usually employing flat-headed or helical blades. These designs often fail to provide sufficient penetration force in loose or hard soil layers. Especially when encountering harder soils such as cohesive soils or gravel layers, screw-in piles are less efficient, requiring significant cutting forces during construction and potentially leading to soil compaction and accumulation, thus affecting construction progress and pile foundation quality. Furthermore, traditional blade designs can cause significant soil disturbance, damaging the surrounding environment and increasing construction difficulty and costs.

[0004] To address these issues, a screw-in environmentally friendly steel pipe pile with a pointed blade is proposed. This design, by installing optimized blades at the tip of the steel pipe pile, aims to improve its penetration in various soil layers, reduce the cutting force required during the screw-in process, and minimize disturbance to the surrounding soil, thereby achieving the dual goals of environmental protection and efficient construction. Summary of the Invention

[0005] This utility model overcomes the shortcomings of the prior art and provides a screw-in environmentally friendly steel pipe pile with a pointed blade.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a screw-in environmentally friendly steel pipe pile with a pointed blade, comprising: a steel pipe pile, a pile cap fixed to the steel pipe pile, and a spinning drive device for driving the steel pipe pile to rotate downwards.

[0007] The pile cap is installed on the back of the steel pipe pile and is driven to rotate by the spinning drive device;

[0008] A tip blade is installed at the tip of the steel pipe pile, and the tip blade covers the tip of the steel pipe pile. The tip blade includes two semi-circular steel plates. The two semi-circular steel plates are welded to the lower end of the tip of the steel pipe pile in a V-shape on the outer periphery of the steel pipe pile.

[0009] In a preferred embodiment of this utility model, a plurality of limiting grooves are provided on the outer periphery of the back of the steel pipe pile, and the limiting grooves are rectangular.

[0010] In a preferred embodiment of this utility model, a fixing component is provided inside the pile cap. The fixing component includes: a drive disk, a worm gear fixed coaxially with the drive disk, a worm meshing with the worm gear, and a limiting block fixed in cooperation with the limiting groove of the steel pipe pile. A drive rod is fixedly connected to one side of the limiting block, and the end of the drive rod away from the limiting block passes through the pile cap and is slidably connected to the pile cap.

[0011] The drive disc is installed inside the pile cap and is rotatably connected to the pile cap. The drive disc is provided with a spiral groove, and a threaded block is assembled in the spiral groove. The threaded block is fixedly connected to the drive rod.

[0012] In a preferred embodiment of this utility model, there are several limiting blocks and several limiting grooves, and they correspond one-to-one.

[0013] In a preferred embodiment of this utility model, the cross-section of the limiting block is gradually reduced, with the cross-section of the side of the limiting block in contact with the driving rod gradually decreasing towards the side away from the driving rod.

[0014] In a preferred embodiment of this utility model, a first cut and a second cut are provided at the forward-protruding end of one of the semicircular steel plates. The first cut is located near the inner diameter of the semicircular steel plate, and the angle of the first cut is 20°-25°. The angle of the second cut is 30°-35°, and the length ratio of the first cut to the second cut is 1-1.25:2. The first cut and the second cut are provided with inclined blades.

[0015] In a preferred embodiment of this utility model, the ratio of the diameter of the semicircular steel plate to the diameter of the steel pipe pile is 1.5-2:1, and the semicircular steel plate is welded to the lower end of the pile tip of the steel pipe pile in a V-shaped intersecting form, with an angle of 7°-10° with the horizontal direction.

[0016] This utility model solves the defects existing in the background technology, and has the following beneficial effects:

[0017] This utility model provides a screw-in environmentally friendly steel pipe pile with pointed blades. By setting the pointed blades, which are semi-circular steel plates, on the outer periphery of the steel pipe pile and welding them in a V-shape, the pile tip can form a wider stress surface when entering the soil layer, dispersing the pressure of the soil. At the same time, it can allow the pile tip to gradually cut into the soil layer, reducing the resistance of each soil layer. Through the gradual rotational cutting action, it can effectively break through the soil, improve the penetration force of the pile, and avoid the large resistance encountered by the pile tip when it comes into contact with hard soil layers, which would lead to slow construction speed or pile deflection.

[0018] This utility model provides a screw-in environmentally friendly steel pipe pile with pointed blades. By setting the pointed blades as semi-circular steel plates on the outer periphery of the steel pipe pile and welding them in a V-shape, the pressure of the soil can be evenly distributed to multiple areas of the pile tip, thereby effectively improving the friction and cohesion between the pile tip and the soil, and thus enhancing the bearing capacity of the pile foundation. At the same time, the uniform distribution of force helps to reduce pile deformation or pull-out caused by excessive local stress at the pile tip. In soft soil and loose soil layers, the optimized distribution of bearing capacity can better ensure the stability of the pile foundation.

[0019] This invention uses semi-circular steel plates with pointed blades welded together in a V-shape on the outer periphery of the steel pipe pile. The pointed blades advance layer by layer, avoiding large-scale soil compaction during the initial cutting process. This helps to reduce the risk of water level rise and settlement problems caused by excessively compacted soil in areas with high groundwater levels. At the same time, the cutting ability and inclined blade design of the pointed blades can gradually reduce the soil, avoiding direct pushing of soil layers, reducing soil disturbance during the drilling process, avoiding uneven settlement caused by construction, and ensuring the safety of the surrounding structure.

[0020] This invention increases the contact area at the pile end and enhances the end bearing capacity by setting the diameter of the tip blade to be 1.5-2 times larger than that of the steel pipe pile. In sandy soil and gravel layers, this large-diameter blade can disperse pressure, reduce local compression of the soil at the pile end, and avoid a decrease in bearing capacity. At the same time, during the screwing process, the tip blade disturbs the surrounding soil through its special geometry, forming a dense zone, thereby increasing the side friction of the pile and further enhancing the overall bearing capacity of the pile foundation. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1This is a perspective structural diagram of a preferred embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the fixing component structure of a preferred embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the tip blade of a preferred embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the tip blade of Embodiment 2 of this utility model;

[0026] In the diagram: 1. Steel pipe pile; 2. Pile cap; 3. Semi-circular steel plate; 4. Limiting groove; 5. Drive disc; 6. Worm gear; 7. Worm; 8. Limiting block; 9. Drive rod; 10. Threaded block; 11. Crushing tooth. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0029] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0030] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.

[0031] Figure 1 , Figure 2 and Figure 3 As shown, a screw-in environmentally friendly steel pipe pile with pointed blades includes: a steel pipe pile 1, a pile cap 2 fixed to the steel pipe pile 1, and a spinning drive device for driving the steel pipe pile 1 to rotate downwards.

[0032] The pile cap 2 is installed on the back of the steel pipe pile 1 and is driven to rotate by a spinning drive device;

[0033] A tip blade is installed at the tip of the steel pipe pile 1, covering the tip of the steel pipe pile 1. The tip blade includes two semi-circular steel plates 3. The two semi-circular steel plates 3 are welded to the lower end of the tip of the steel pipe pile 1 in a V-shaped intersecting form on the outer periphery of the steel pipe pile 1.

[0034] The spinning drive device is a motor. By fixing the output end of the motor to the axis of the pile cap 2, the motor drives the pile cap 2 to rotate, thereby driving the steel pipe pile 1 to rotate.

[0035] Several steel pipe piles 1 are provided. Among them, the steel pipe piles 1 to be driven are equipped with pointed blades at their ends. The steel pipe piles 1 with pointed blades at their ends are driven by a spinning drive device to rotate and press down into the soil layer towards the driving position. When the length of the steel pipe pile 1 cannot reach the target driving depth, the steel pipe pile 1 is welded to the steel pipe pile 1 that enters the soil layer. Specifically, the prepared steel pipe pile 1 is lifted by a crane, and one end of the lifted steel pipe pile 1 is aligned with the end of the steel pipe pile 1 that enters the soil layer, so that the axes of the two steel pipe piles 1 are located at the same axis position. The contact position of the two steel pipe piles 1 is welded using a welding device to ensure the stability of the weld position.

[0036] In Example 1, the tip blade is composed of two semi-circular steel plates 3. By welding the two semi-circular steel plates 3 to the lower end of the pile tip of the steel pipe pile 1 in a V-shape, the pile tip can form a wider stress surface when entering the soil layer, dispersing the pressure of the soil. At the same time, it can allow the pile tip to gradually cut into the soil layer, reducing the resistance of each soil layer. Through the gradual rotational cutting action, it can effectively break through the soil, improve the penetration force of the pile, and avoid the large resistance when the pile tip of the steel pipe pile 1 contacts the hard soil layer, which would lead to a slowdown in construction speed or pile body deflection.

[0037] After determining the piling location, a piling machine rotates and presses the steel pipe pile 1, with its tip equipped with a pointed blade, into the soil layer towards the piling location. A spinning drive device rotates the pile cap 2, which is fixed to the steel pipe pile 1. This rotation causes the pointed blade at the pile tip to rotate towards the piling location, gradually cutting into the soil layer until the steel pipe pile 1 reaches its designed depth. Then, the steel pipe pile 1 is separated from the pile cap 2, and a crane lifts the prepared steel pipe pile 1. One end of the steel pipe pile 1 is aligned with the end of the steel pipe pile 1 that enters the soil layer, ensuring that the axes of the two steel pipe piles 1 are located at the same axis position. The contact position of the two steel pipe piles 1 is welded using a welding device to ensure the stability of the weld position. The pile cap 2 is fixed to the welded steel pipe pile 1. The pile cap 2 is rotated using a spinning drive device to move the steel pipe pile 1 downward into the soil layer. It is then determined whether the depth of the pile foundation has reached the design depth. If the design depth of the pile foundation has been reached, the construction of the steel pipe pile 1 is completed. If the design depth of the pile foundation has not been reached, the pile is continued until the design depth of the pile foundation is reached.

[0038] Before the pile driver is started, the anti-shake device needs to be fixed on the guide rail of the pile driver to prevent the pile from shaking.

[0039] Among them, the end of the steel pipe pile 1 closest to the soil layer is the pile tip position, and the end of the steel pipe pile 1 furthest from the soil layer is the pile back position.

[0040] In this utility model, a plurality of limiting grooves 4 are provided on the outer periphery of the back of the steel pipe pile 1, and the limiting grooves 4 are rectangular.

[0041] The pile cap 2 is provided with a fixing component, which includes: a drive disk 5, a worm gear 6 fixed coaxially with the drive disk 5, a worm 7 meshing with the worm gear 6, and a limiting block 8 that is fixed in conjunction with the limiting groove 4 of the steel pipe pile 1; a drive rod 9 is fixedly connected to one side of the limiting block 8, and the end of the drive rod 9 away from the limiting block 8 passes through the pile cap 2 and is slidably connected to the pile cap 2.

[0042] The drive disc 5 is installed inside the pile cap 2 and is rotatably connected to the pile cap 2. The drive disc 5 is provided with a spiral groove, and a threaded block 10 is assembled in the spiral groove. The threaded block 10 is fixedly connected to the drive rod 9.

[0043] The pile cap 2 has a structure that reliably transmits the rotational driving force of the motor to the rotating metal fitting of the steel pipe pile 1. When it is necessary to drive the steel pipe pile 1 to rotate into the soil, the pile cap 2 needs to be fixed to the steel pipe pile 1. By fitting the pile cap 2 onto the back of the steel pipe pile 1, the worm gear 7 drives the worm wheel 6 to rotate. The worm wheel 6 is coaxially fixed with the drive disc 5, and the drive disc 5 is rotatably connected to the pile cap 2. Therefore, the drive disc 5 and the worm wheel 6 rotate synchronously. The drive disc 5 has a spiral groove, and a threaded block 10 is provided on one side of the spiral groove to move in a threaded engagement with it. The threaded block 10 is fixed to the drive rod 9, and the drive rod 9 passes through the pile cap 2 and slides. Therefore, during the rotation of the drive disc 5, the spiral groove drives the threaded block 10 to move towards the axis of the drive disc 5, thereby driving the limiting block 8 into the limiting groove 4 of the steel pipe pile 1, realizing the engagement of the limiting block 8 and the limiting groove 4, and realizing the limiting fixation of the pile cap 2 and the steel pipe pile 1.

[0044] By utilizing the cooperation of worm gear 6 and worm 7, worm gear 7 drives worm gear 6 and transmits power to drive disk 5. At the same time, the self-locking property ensures the stable connection between pile cap 2 and steel pipe pile 1 during rotation. When rotation stops, worm gear 6 and worm 7 automatically lock, which can effectively prevent loosening or displacement even if pile cap 2 is subjected to external forces such as soil resistance or vibration of construction machinery.

[0045] By using the limiting block 8 to cooperate with the limiting groove 4 on the steel pipe pile 1 for limiting, steel pipe piles 1 of different sizes can be clamped without replacing the entire drive device. Only the fixing components of the pile cap 2 need to be readjusted, which facilitates disassembly, transportation and storage, and helps to reduce handling costs and storage space requirements.

[0046] In this utility model, there are several limiting blocks 8 and limiting grooves 4, and they correspond one-to-one.

[0047] The cross-section of the limiting block 8 is gradually reduced, with the cross-section of the side of the limiting block 8 that contacts the drive rod 9 gradually decreasing towards the side away from the drive rod 9.

[0048] The gradient cut surface design allows the limiting block 8 to be inserted into or removed from the limiting groove 4 more smoothly during installation or removal, reducing resistance and jamming caused by the excessively vertical contact surface.

[0049] The gradient cut surface allows the limiting block 8 to gradually transition the force when it comes into contact with the limiting groove 4, effectively reducing the phenomenon of local stress concentration, improving the contact stability between the limiting block 8 and the limiting groove 4, and avoiding deformation of the limiting groove 4 or damage to the limiting block 8 due to excessive local pressure.

[0050] Meanwhile, the gradually changing cut surface can be gradually embedded into the limiting groove 4 during the spinning process, forming a tighter fit and improving the stability and clamping force of the limiting block 8.

[0051] In this utility model, a first cut and a second cut are provided at the forward-protruding end of one of the semicircular steel plates 3. The first cut is close to the inner diameter of the semicircular steel plate 3, and the angle of the first cut is 20°-25°. The angle of the second cut is 30°-35°. The length ratio of the first cut to the second cut is 1-1.25:2. The first cut and the second cut are provided with inclined blades.

[0052] The inclined blade design creates a sharper cutting edge, which effectively cuts and breaks the soil when the steel pipe pile 1 is screwed into the stratum, reducing soil resistance. The presence of the cut enhances the penetration power of the tip blade, making the steel pipe pile 1 enter hard soil or gravel layers more smoothly.

[0053] The inclined cutting edge can guide the soil to disperse to both sides, avoiding the accumulation of soil at the front end of the steel pipe pile 1, thereby reducing the resistance during the screwing process. The cut design optimizes the path of rotational cutting, enabling the steel pipe pile 1 to penetrate the strata more efficiently.

[0054] At the same time, by optimizing the force distribution, the cut and blade reduce stress concentration at the blade tip, lowering the risk of wear and damage, thereby extending the blade's service life.

[0055] In this utility model, the ratio of the diameter of the semi-circular steel plate 3 to the diameter of the steel pipe pile 1 is 1.5-2:1, and the semi-circular steel plate 3 is welded to the lower end of the pile tip of the steel pipe pile 1 in a V-shaped intersecting form, with an angle of 7°-10° with the horizontal direction.

[0056] It helps increase the contact area between the pile tip and the soil layer, thereby improving the bearing capacity of the pile tip, especially in loose or soft soil layers. It can effectively disperse the pressure applied to the pile body and enhance the stability of the pile foundation.

[0057] Large-diameter pointed blades can distribute the pressure applied to the pile tip to a larger soil area, avoiding excessive soil compaction or blockage at the pile tip, reducing soil accumulation or compression at the pile tip, and helping to maintain soil stability, especially in aquifers or loose layers, to avoid excessive disturbance.

[0058] Example 2, as Figure 4 As shown, several tip blades are provided, evenly distributed on the outer periphery of the steel pipe pile. The tip blades include: two semi-circular steel plates; the two semi-circular steel plates are welded to the lower end of the pile tip of the steel pipe pile 1 in a V-shaped intersection on the outer periphery of the steel pipe pile 1. The protruding part of the semi-circular steel plate is provided with a first cut and a second cut. The first cut is close to the inner diameter of the semi-circular steel plate. The angle of the first cut is 20°-25°, and the angle of the second cut is 30°-35°. The length ratio of the first cut to the second cut is 1-1.25:2. The first cut and the second cut are provided with inclined blades.

[0059] The inner and outer walls of the steel pipe pile are provided with several crushing teeth 11, which are used to crush hard objects inside the pile body during the rotation of the steel pipe pile, thereby reducing the resistance caused by the hard objects to the pile body.

[0060] It should be noted that during use, the crushing teeth 11 can be evenly distributed on the inner and outer walls of the steel pipe pile. The crushing teeth are evenly distributed in the circumferential and radial directions, and each tooth is relatively balanced in force and has a consistent force transmission path, which has higher transmission efficiency and stability. It is suitable for long-term continuous operation. The even distribution of crushing teeth reduces mechanical vibration during operation.

[0061] Furthermore, the crushing teeth 11 can be irregularly distributed on the inner and outer walls of the steel pipe pile. The irregular distribution can enhance the penetration ability of the teeth in certain specific directions, making it suitable for heterogeneous soil layers or soil containing obstacles. The size or distribution density of the teeth can be strengthened in certain specific locations, which helps to efficiently cut hard soil layers or decompose blocky soil. The distribution and shape of the crushing teeth can be adjusted according to the needs of the scenario.

[0062] The semi-circular steel plate is set in a semi-circular ring. The pointed blade formed by the V-shaped intersection of the semi-circular steel plate on the outer periphery of the steel pipe pile 1 is set as an opening. The opening allows more space for soil distribution at the pile tip, which can help to effectively cut and disperse the soil layer, reduce the accumulation of soil at the pile tip, avoid the "blockage" phenomenon of soil, and reduce the resistance during the screwing process. The opening position is connected to the inside of the steel pipe pile, which helps to reduce the compaction of the soil, especially in soft soil, loose soil layers, etc., which helps to screw the pile in more smoothly.

[0063] It should be noted that the semi-circular steel plate is fixed to the steel pipe pile by welding, and the semi-circular steel plate comes in multiple models. Before driving the pile, the appropriate semi-circular steel plate is selected and welded to the steel pipe pile according to the structure of the soil layer.

[0064] For example, when the soil layer at the piling location is a loose soil layer, a soft soil layer, or a cohesive soil layer, a semi-circular steel plate is used instead of a semi-circular steel plate. This results in no opening between the pointed blades formed by the two semi-circular steel plates. When using this pointed blade for piling, the soil layer at the pile tip can be pushed to the outside of the pile body, thereby compressing the soil layer and strengthening the soil layer on the outside of the pile body. This prevents the pile body from shaking due to loose soil layers and improves the stability of the pile body.

[0065] When driving piles in hard soil, gravel, and rock layers, a pointed blade composed of two semi-circular steel plates is used. The pointed blade is open and breaks up the hard soil and hard objects in the soil during pile driving. As the steel pipe pile is drilled downwards, the hard objects in the soil will enter the inner wall of the pile through the opening of the pointed blade, thereby reducing the resistance of pile driving, further reducing the wear of the pointed blade, and increasing the pile driving speed.

[0066] When using different types of pointed blades for piling in hard soil layers, it is necessary to detect the number of hard soil layers at the piling location in advance. If there are two hard soil layers at the piling location, two pointed blades are welded onto the steel pipe pile. The pointed blade located at the tip of the steel pipe pile is the first section, and the pointed blade located in the middle of the steel pipe pile body is the second section. The ratio of the diameter of the semicircular steel plate in the second section of the pointed blade to the diameter of the semicircular steel plate in the first section of the pointed blade is 1.2-1.25:1, making the second section of the pointed blade slightly larger.

[0067] Using a configuration with two tip blades mounted on a single steel pipe pile provides a larger cutting area, facilitating rapid penetration into the soil. The first tip blade breaks through two layers of hard soil, while the second tip blade breaks through the first layer. The two tip blades provide a larger cutting surface, dispersing the pressure applied to the pile tip in loose soil layers, increasing the pile's bearing capacity, and reducing wear on individual tip blades. The larger contact area helps the pile tip penetrate better, reducing screwing resistance, increasing screwing speed, and ensuring efficient construction. The second tip blade, with its larger diameter, provides a larger support area in hard soil layers, thus improving the stability of the pile during and after construction. This helps reduce the risk of lateral displacement or tilting of the pile, and the slightly larger second tip blade effectively disperses the vertical and horizontal stresses generated during pile driving, reducing stress concentration on a single tip blade and lowering the risk of damage to the pile tip or structure.

[0068] The material of the semi-circular steel plate in the tip blade is HBL385B (550N / mm2 grade TMCP steel for building structures, certification number MSTL-0130, MSTL-0131).

[0069] It should be noted that metal mesh strips are welded to the semi-circular steel plates in the tip blades to increase the surface hardness of the semi-circular steel plates, reduce the wear and passivation of the tip blades during the screwing process, thereby extending the service life of the blades. At the same time, the structure of the metal mesh strips can effectively disperse the frictional force acting on the surface of the tip blades, reduce the concentrated area of ​​wear, and reduce the damage to the tip blades caused by excessive wear.

[0070] It is worth mentioning that, in order to improve the construction speed, the pointed blades can be pre-welded to the short piles. When it is time to drive the piles, the short piles with the pointed blades are moved to the construction position and welded to the steel pipe piles, which can improve the construction speed.

[0071] When using this utility model, after determining the piling position, it is necessary to fix the pile cap 2 to the steel pipe pile 1. By fitting the pile cap 2 onto the back of the steel pipe pile 1, the worm gear 7 is rotated to drive the worm wheel 6 to rotate. The worm wheel 6 is coaxially fixed with the drive disc 5, and the drive disc 5 is rotatably connected to the pile cap 2. Therefore, the drive disc 5 and the worm wheel 6 rotate synchronously. The drive disc 5 has a spiral groove, and a threaded block 10 is provided on one side of the spiral groove to move in a threaded engagement with it. The threaded block 10 is fixed with the drive rod 9, and the drive rod 9 passes through the pile cap 2 and slides. Therefore, during the rotation of the drive disc 5, the spiral groove drives the threaded block 10 to move towards the axis of the drive disc 5, thereby driving the limiting block 8 into the limiting groove 4 of the steel pipe pile 1, so that the limiting block 8 and the limiting groove 4 are engaged, and the pile cap 2 and the steel pipe pile 1 are fixed in a limiting position.

[0072] A steel pipe pile 1, with a pointed blade at its end, is driven down into the soil by a pile driver. The pile cap 2, fixed to the steel pipe pile 1, rotates as the pile cap 2 drives the steel pipe pile 1. The pointed blade at the tip of the steel pipe pile 1 rotates towards the driving position, gradually cutting into the soil until the steel pipe pile 1 reaches its designed depth. Then, the steel pipe pile 1 is separated from the pile cap 2, and a crane lifts the prepared steel pipe pile 1. One end of the steel pipe pile 1 is aligned with the end of the steel pipe pile 1 that enters the soil layer, ensuring that the axes of the two steel pipe piles 1 are located at the same axis position. The contact position of the two steel pipe piles 1 is welded using a welding device to ensure the stability of the weld position. The pile cap 2 is fixed to the welded steel pipe pile 1. The pile cap 2 is rotated using a spinning drive device to drive the steel pipe pile 1 to move downward into the soil layer. It is then determined whether the depth of the pile foundation has reached the design depth. If the design depth of the pile foundation has been reached, the construction of the steel pipe pile 1 is completed. If the design depth of the pile foundation has not been reached, the pile is continued until the design depth of the pile foundation is reached.

[0073] Based on the preferred embodiments of this utility model described above, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification but must be determined according to the claims.

Claims

1. A screw-in environmentally friendly steel pipe pile with pointed blades, comprising: A steel pipe pile, a pile cap fixed to the steel pipe pile, and a spinning drive device for driving the steel pipe pile to rotate downwards, characterized in that... The pile cap is installed on the back of the steel pipe pile and is driven to rotate by the spinning drive device; A tip blade is installed at the tip of the steel pipe pile, and the tip blade covers the tip of the steel pipe pile. The tip blade includes two semi-circular steel plates. The two semi-circular steel plates are welded to the lower end of the tip of the steel pipe pile in a V-shape on the outer periphery of the steel pipe pile.

2. The screw-in environmentally friendly steel pipe pile with pointed blades according to claim 1, characterized in that: The steel pipe pile has several limiting grooves on the outer periphery of the pile back, and the limiting grooves are rectangular.

3. The screw-in environmentally friendly steel pipe pile with pointed blades according to claim 1, characterized in that: The pile cap is provided with a fixing component, which includes: a drive disk, a worm gear fixed coaxially with the drive disk, a worm meshing with the worm gear, and a limiting block that is fixed in conjunction with the limiting groove of the steel pipe pile; a drive rod is fixedly connected to one side of the limiting block, and the end of the drive rod away from the limiting block passes through the pile cap and is slidably connected to the pile cap. The drive disc is installed inside the pile cap and is rotatably connected to the pile cap. The drive disc is provided with a spiral groove, and a threaded block is assembled in the spiral groove. The threaded block is fixedly connected to the drive rod.

4. A screw-in environmentally friendly steel pipe pile with pointed blades according to claim 3, characterized in that: There are several of each of the limiting blocks and the limiting slots, and they correspond one-to-one.

5. A screw-in environmentally friendly steel pipe pile with pointed blades according to claim 3, characterized in that: The cut surface of the limiting block is gradually reduced, with the cut surface on the side of the limiting block that contacts the driving rod gradually decreasing in size towards the side away from the driving rod.

6. A screw-in environmentally friendly steel pipe pile with pointed blades according to claim 1, characterized in that: One of the semicircular steel plates has a first cut and a second cut at its forward-protruding end. The first cut is located near the inner diameter of the semicircular steel plate. The angle of the first cut is 20°-25°, and the angle of the second cut is 30°-35°. The length ratio of the first cut to the second cut is 1-1.25:

2. Both the first cut and the second cut have inclined blades.

7. A screw-in environmentally friendly steel pipe pile with pointed blades according to claim 1, characterized in that: The ratio of the diameter of the semicircular steel plate to the diameter of the steel pipe pile is 1.5-2:

1. The semicircular steel plate is welded to the lower end of the pile tip of the steel pipe pile in a V-shaped intersecting form, with an angle of 7°-10° with the horizontal direction.

8. A screw-in environmentally friendly steel pipe pile with pointed blades according to claim 1, characterized in that: The steel pipe pile has several crushing teeth on both its inner and outer walls.

Images