Multi-spiral blade and threaded pipe pile

Abstract

The utility model relates to a kind of multi-width spiral blade and screw pipe pile, belong to concrete prestressed pile technical field, wherein multi-width spiral blade includes several axis collinear spiral blade body, at least two pieces the projection of the spiral blade body in radial direction has overlapping portion, any two pieces the spiral blade body does not contact, the rotation direction of all the spiral blade body is same. With the effect of improving screw pipe pile bearing capacity and uplift resistance.

Description

Technical Field

[0001] This utility model relates to the field of prestressed concrete pile technology, specifically to a multi-spindle spiral blade and threaded pipe pile. Background Technology

[0002] Threaded pipe piles are driven into the ground by screwing. When the pile reaches the designed bearing layer, the load is borne by the mechanical interlocking of the pile tip, pile body, concrete helical blades, and soil. Existing threaded pipe piles typically only have a single helical blade. For applications with high load requirements, we need a helical blade with a specific structure. Utility Model Content

[0003] One objective of this utility model is to provide a multi-bladed helical blade to solve the problem that existing threaded pipe piles using a single helical blade have insufficient bearing capacity in situations with high load requirements; the second objective is to propose a threaded pipe pile.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A multi-axis helical blade includes several helical blade bodies with collinear axes, at least two of the helical blade bodies have overlapping radial projections, no two of the helical blade bodies are in contact, and all the helical blade bodies have the same rotation direction.

[0005] Furthermore, the pitch of the same spiral blade body is the same; or, the pitch of the same spiral blade varies along the axial direction.

[0006] Furthermore, the starting ends of all the said helical blade bodies are on a first plane, which is perpendicular to the axis of the helical blade body.

[0007] Furthermore, the end points of all the said helical blade bodies are on the second plane, which is perpendicular to the axis of the helical blade body.

[0008] Furthermore, all of the spiral blades are evenly distributed along the circumference of the pile body.

[0009] Furthermore, each of the spiral blades is provided with a concave portion, and two adjacent concave portions on the same spiral blade body are spaced 180° apart in the circumferential direction.

[0010] Furthermore, the recess is provided on the upper and / or lower surface of the helical blade body.

[0011] Furthermore, the connection between the concave portion and the helical blade body is a smooth transition; or, the connection between the concave portion and the helical blade body is a stepped structure.

[0012] On the other hand, this utility model also proposes a threaded pipe pile, which includes a pile body and the aforementioned multiple spiral blades, both of which are concrete structures and integrally formed.

[0013] Furthermore, a pile tip is fixedly provided at one end of the pile body, and a soil-breaking component is fixedly provided on the pile tip.

[0014] The beneficial effects of this utility model are: After the threaded pipe pile is formed, the pile tip, pile body, concrete helical blades and soil are fully engaged. The vertical bearing capacity of the pile is composed of: the vertical compressive bearing capacity of the soil at the pile tip + the frictional resistance between the pile body surface area and the soil + the overall shear failure strength of the soil within the entire length of the helical blades. By setting multiple helical blade bodies to form a multi-helical blade structure, it is only necessary to make the total length of the radial projection of the multiple helical blade bodies equal to the total length of the radial projection of the single helical blade body. Since there will be overlapping parts of the multiple helical blade bodies, the use of multiple helical blade bodies increases the surface area of ​​the concrete helical blades and improves the vertical bearing capacity of the pile.

[0015] This application, by uniformly arranging the helical blades around the circumference of the pile, is equivalent to setting multiple continuous, coaxial "guide rings" or "stabilizers" along the length of the pile. During the screwing process, the threaded pipe pile is subjected to uniform force. These helical blades can continuously contact the borehole wall and correct minor deviations, providing a stable straightening effect, effectively preventing the pile from tilting, and ensuring the verticality of the pile driving.

[0016] This application, through its concave design, can solve the problem of inconvenient demolding when the mold for producing spiral pipe piles has only two halves.

[0017] This application, through the design of the concave portion, reduces the spiral friction resistance on the surface of the spiral blades during the spiral pipe pile's entry into the soil, thereby reducing the resistance torque of the spiral pipe pile entering the soil. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of a multi-helical blade and threaded pipe pile of the present invention, which uses two helical blade bodies. Figure 2 This utility model discloses a multi-helical blade and a threaded pipe pile with a structure consisting of two helical blade bodies. Figure 1 ; Figure 3 This utility model discloses a multi-helical blade and a threaded pipe pile, which uses two helical blade bodies. Figure 2 ; Figure 4This utility model discloses a multi-helical blade and a threaded pipe pile with a structure consisting of two helical blade bodies. Figure 3 ; Figure 5 This is a schematic diagram of a partial structure of a multi-helical blade and threaded pipe pile of the present invention, which uses two helical blade bodies. Figure 1 ; Figure 6 This is a schematic diagram of a partial structure of a multi-helical blade and threaded pipe pile of the present invention, which uses two helical blade bodies. Figure 2 Figure 7 This is a schematic diagram of a partial structure of a multi-helical blade and threaded pipe pile of the present invention, which uses a three-helical blade body. Figure 1 ; Figure 8 This is a schematic diagram of a partial structure of a multi-helical blade and threaded pipe pile of the present invention, which uses a three-helical blade body. Figure 2 ; Figure 9 This is a schematic diagram of a partial structure of a multi-helical blade and threaded pipe pile of the present invention, which uses a four-helical blade body. Figure 1 ; Figure 10 This is a schematic diagram of a partial structure of a multi-helical blade and threaded pipe pile of the present invention, which uses a four-helical blade body. Figure 2 .

[0019] The components include: 1. Spiral blade body; 2. Concave part; 3. Pile body; 4. Pile tip; and 5. Soil-breaking component. Detailed Implementation

[0020] The embodiments of this utility model will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be understood that the preferred embodiments are only for illustrating this utility model and not for limiting the scope of protection of this utility model.

[0021] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0022] This embodiment proposes a multi-plane helical blade, such as Figures 1 to 6As shown, the structure includes several helical blade bodies 1 with collinear axes. At least two helical blade bodies 1 have overlapping radial projections, and no two helical blade bodies 1 are in contact. All helical blade bodies 1 rotate in the same direction, such as clockwise or counterclockwise. In this embodiment, because multiple helical blade bodies 1 have overlapping blades, the surface area of ​​the concrete helical blades is increased, thereby improving the vertical bearing capacity of the pile.

[0023] In one optional embodiment, the pitch of the same helical blade body 1 changes along the axial direction, while the pitch changes of multiple helical blade bodies 1 follow different patterns along the axial direction of the pile body.

[0024] In another alternative embodiment, the pitch of the same helical blade body 1 changes along the axial direction, and the pitch changes of multiple helical blade bodies 1 change synchronously or differently according to this rule.

[0025] In other alternative embodiments, the pitch of the same helical blade body 1 is the same, while the pitch of different helical blade bodies 1 is different.

[0026] In other alternative embodiments, the pitch of the same helical blade body 1 is the same, and the pitch between all helical blade bodies 1 is the same.

[0027] In this embodiment, it is preferable that the pitch of the same spiral blade body 1 is the same, and the pitch of all spiral blade bodies 1 is the same, so that the threaded pipe pile is more uniformly stressed and the mold of the spiral pipe pile is easier to produce.

[0028] In practice, the starting end of each helical blade body 1 can be at different positions along the axial direction of the pile body 3. In this embodiment, the starting ends of all helical blade bodies 1 are on the first plane, which is perpendicular to the axis of the helical blade body 1. That is, all helical blade bodies 1 are at the same cross-sectional position in the pile body 3, and each helical blade body 1 extends synchronously along the axial direction of the pile body 3.

[0029] In practice, the endpoints of each helical blade body 1 can be at different positions along the axial direction of the pile body 3, meaning that the axial lengths of each helical blade are different. In this embodiment, the endpoints of all helical blade bodies 1 are on the second plane, which is perpendicular to the axis of the helical blade body 1, meaning that all helical blade bodies 1 are at the same cross-sectional position in the pile body 3.

[0030] In practice, within the same cross-section of the pile body 3, the starting ends of each helical blade body 1 can be arranged at uneven intervals along the circumference of the pile body 3. In this embodiment, all the helical blade bodies 1 are evenly distributed along the circumference of the pile body 3, that is, within the same cross-section of the pile body 3, the starting ends of each helical blade body 1 are evenly spaced along the circumference of the pile body 3, such as two blades at 180°, three blades at 120°, etc., and then synchronously extend spirally along the axial direction of the pile body 3. Alternatively, all the helical blade bodies 1 can be unevenly distributed along the circumference of the pile body 3.

[0031] Each helical blade has a recess 2, and two adjacent recesses 2 on the same helical blade body 1 are spaced 180° apart in the circumferential direction. In this embodiment, the recesses 2 can be provided on the helical blade body 1 in the following ways: The recess 2 is provided on the upper surface of the spiral blade body 1; Alternatively, the recessed portion 2 may be provided on the lower surface of the spiral blade body 1; Alternatively, the recessed portion 2 may be asymmetrically disposed on the upper and lower surfaces of the spiral blade body 1; Alternatively, the concave portions 2 can be symmetrically arranged on the upper and lower surfaces of the spiral blade body 1.

[0032] like Figure 1-3 As shown, in this embodiment, the recessed portions 2 are preferably symmetrically arranged on the upper and lower surfaces of the helical blade body 1. The connection between the concave portion 2 and the helical blade body 1 is a smooth transition, which makes the resistance transmission on the helical blade body 1 more uniform and continuous; or, the connection between the concave portion 2 and the helical blade body 1 is a stepped structure, but the step shape of the connection between the concave portion 2 and the helical blade body 1 makes it easier to demold during the production of pipe piles than the smooth transition of the connection between the concave portion 2 and the helical blade body 1. At the same time, the resistance transmitted by the helical blade body 1 is not uniform and continuous.

[0033] On the other hand, this utility model also proposes a threaded pipe pile, which includes a pile body 3 and the aforementioned multi-helical blades. Both the pile body 3 and the multi-helical blades are concrete structures and are integrally formed.

[0034] A pile tip 4 is fixedly provided at one end of the pile body 3, and a soil-breaking component 5 is fixedly provided on the pile tip 4. The pile tip 4 can be a concrete structure integrally formed on the pile body 3, or the pile tip 4 can be manufactured separately and then connected to the pile body 3 when needed, such as by means of pins, welding, etc. In this embodiment, the soil-breaking component 5 can be provided on the pile tip 4 in the following ways: The pile tip 4 is a truncated cone shape with a larger top and a smaller bottom. The soil breaking component 5 is a steel bar inserted at the center of the bottom of the pile tip 4. The steel bar can be pre-embedded and fixedly connected to the pile tip 4.

[0035] The pile tip 4 is a frustum shape with a larger top and a smaller bottom, and the soil breaking component 5 is a cone shape. The soil breaking component 5 is made of steel, with the tip of the soil breaking component 5 facing downwards. The top of the soil breaking component 5 matches the bottom of the pile tip 4 and can be fixedly connected by welding.

[0036] The pile tip 4 is conical with the tip pointing downwards. The soil-breaking component 5 is made of sheet metal and is fixedly wrapped around the surface of the pile tip 4. It can be fixed and connected by welding.

[0037] In the above embodiment, the pile body 3 has a central through hole, which facilitates the fixed installation of the anti-torsion component on the inner wall of the central through hole. The torsion component is connected to the threaded pipe pile in a keyed manner, so that the threaded pipe pile can be rotated by the torsion component. Since a pile tip 4 is provided at the pile end, one end of the torsion component is inserted through the central through hole, and the other end does not need to penetrate through the pile end, but can be located near the pile end. The pile tip 4 can be solid or hollow. A helical part can be provided on the surface of the pile tip 4, which is similar to a helical blade. Alternatively, each helical blade body 1 can be extended towards the surface of the pile tip 4, or the helical part can be not provided on the surface of the pile tip 4.

[0038] After the threaded pipe pile is formed, the pile tip, pile body 3, concrete helical blades and soil are fully engaged. The vertical bearing capacity of the pile is composed of: the vertical compressive bearing capacity of the soil at the pile tip + the frictional resistance between the surface area of ​​the pile body 3 and the soil + the overall shear failure strength of the soil within the entire length range between the helical blades.

[0039] After the threaded pipe pile is completed, the pull-out force of the pile is composed of: the frictional resistance between the surface area of ​​the pile body and the soil + the overall shear failure strength of the soil over the entire length of the spiral blades.

[0040] In summary, the threaded pipe pile in this embodiment, by uniformly arranging multiple helical blades 1 along the circumferential direction on the surface of the pile body 3, increases the helical density and the contact area between the threaded pipe pile and the soil layer, significantly improving the pile's bearing capacity and pull-out resistance. Simultaneously, the design of the concave portion 2 in this embodiment solves the problem of inconvenient demolding during the production of the helical pipe pile, and also reduces the resistance torque during the spiral pipe pile's entry into the soil.

[0041] The above embodiments are merely preferred embodiments provided to fully illustrate the present utility model, and the protection scope of the present utility model is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present utility model are all within the protection scope of the present utility model.

Claims

1. A multi-plane helical blade, characterized in that: It includes several helical blade bodies with collinear axes, at least two of the helical blade bodies have overlapping radial projections, no two of the helical blade bodies are in contact, and all the helical blade bodies have the same rotation direction. The pitch of the same spiral blade body is the same; or, the pitch of the same spiral blade varies along the axial direction.

2. The multi-helical blade according to claim 1, characterized in that: The starting ends of all the said helical blade bodies are on a first plane, which is perpendicular to the axis of the helical blade body.

3. The multi-helical blade according to claim 2, characterized in that: The end points of all the said helical blade bodies are on a second plane, which is perpendicular to the axis of the helical blade body.

4. The multi-helical blade according to claim 3, characterized in that: All of the spiral blades are evenly distributed along the circumference of the pile.

5. The multi-helical blade according to any one of claims 1-4, characterized in that: Each of the spiral blades is provided with a concave portion, and two adjacent concave portions on the same spiral blade body are spaced 180° apart in the circumferential direction.

6. The multi-helical blade according to claim 5, characterized in that: The recessed portion is provided on the upper surface and / or lower surface of the helical blade body.

7. The multi-helical blade according to claim 6, characterized in that: The connection between the recess and the helical blade body is a smooth transition; or, the connection between the recess and the helical blade body is a stepped structure.

8. A threaded pipe pile, characterized in that: The threaded pipe pile includes a pile body and multiple spiral blades as described in any one of claims 1-7, wherein both the pile body and the multiple spiral blades are concrete structures and are integrally formed.

9. The threaded pipe pile according to claim 8, characterized in that: One end of the pile body is fixedly provided with a pile tip, and a soil breaking device is fixedly provided on the pile tip.

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