Hollowed-out crescent bulge compression-resistant steel pipe pile

Abstract

The invention discloses a hollow-out crescent bulge compression-resistant steel pipe pile in the technical field of offshore foundation engineering equipment. The hollow-out crescent bulge compression-resistant steel pipe pile comprises a pile body and a crescent bulge. The pile body is generally formed by spirally welding steel plates; the crescent protrusions are arranged on the side wall of the steel pipe pile in a stamping mode. Compared with a traditional steel pipe pile, the compressive steel pipe pile has the advantages that the roughness degree of the side wall is increased through the crescent protrusions, and the pile side friction resistance of the steel pipe pile is increased; and meanwhile, through the coupling effect of the crescent protrusions and the soil body, more soil bodies are transferred to resist sliding of the pile body, the risk of pile sliding in the pile sinking process is reduced, and the compressive bearing capacity of the soil body is also improved. The invention can be applied to the foundation of an ocean platform.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore foundation engineering equipment, in particular to a hollow crescent-shaped convex compression-resistant steel pipe pile. Background Art

[0002] Steel pipe piles feature high strength, high bending resistance, elasticity, and ease of manufacture and construction. Therefore, they are widely used in the traditional construction industry for building foundation support and reinforcement, enhancing the stability and safety of projects. Pile foundations are a widely adopted foundation type for offshore oil platforms in the Bohai Bay region. Typically constructed of steel, these foundations feature larger diameters, longer lengths, and greater penetration depths than conventional onshore pile foundations. Offshore platforms, also known as "land in the ocean," are marine engineering structures that provide essential offshore operations and living spaces for the development and utilization of marine resources. As tools for marine resource development, offshore platforms play a vital role in offshore oil and gas exploration and development, submarine pipeline laying, and offshore oil and gas resource extraction, and are a hallmark of China's manufacturing industry. Conventional jacket platforms have four or eight legs and are primarily composed of piles, jackets, and modules. The Chengdao area of the Bohai Sea, where the seafloor sediments are primarily silt and subject to intense hydrodynamic forces, presents a high risk of severe liquefaction under strong hydrodynamic conditions. Moderate liquefaction also occurs in Laizhou Bay, Liaodong Bay, the Chengdao area, and the Luanhe River estuary. Soil liquefaction increases the risk of pile slippage during pile sinking. This slippage can damage the pile and the hammer, severely impacting driving efficiency and increasing costs. Excessive slippage can also cause the piling vessel to capsize, leading to serious accidents. While geological conditions are difficult to alter, the risk of slippage can be mitigated by modifying the sidewall configuration of the pile foundation. Furthermore, with the advancement of offshore oil and gas extraction technology, the loads on offshore platforms are increasing, placing new demands on the compressive bearing capacity of the foundation. Therefore, exploring new sidewall configurations is crucial. Summary of the Invention

[0003] To improve the compressive bearing capacity of marine engineering foundations, this invention incorporates a crescent-shaped protrusion into the pile shaft, in addition to the traditional steel pipe pile. This downward-facing crescent-shaped protrusion not only increases the roughness of the pile shaft but also increases the contact area between the pile shaft and the soil, mobilizing more soil to resist vertical loads and thereby enhancing the compressive bearing capacity of the steel pipe pile.

[0004] The present invention adopts the following technical solutions:

[0005] A hollow crescent-shaped bulge-resistant steel pipe pile comprises a pile body and a crescent-shaped bulge. The crescent-shaped bulge is distributed in a ring array and punched into holes in the pile body.

[0006] The present invention provides a hollow crescent-shaped bulge-resistant steel pipe pile, wherein the cross-section of the crescent-shaped bulge is a combination of an ellipse and a circle, wherein the minor axis of the ellipse is equal to the radius of the circle.

[0007] The present invention provides a hollow crescent-shaped compression-resistant steel pipe pile, wherein the crescent-shaped protrusion opens downward and is hollow inside.

[0008] In the present invention, the hollow crescent-shaped compression-resistant steel pipe piles are arranged in a circular array horizontally and spaced vertically from the smooth surface. The array spacing (a) and the smooth surface length (b) are determined based on soil parameters.

[0009] The present invention provides a hollow crescent-shaped bulge-resistant steel pipe pile, wherein the length (L) and height (H) of the crescent-shaped bulge are combined according to the load. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The present invention is further described with reference to the accompanying drawings.

[0011] Figure 1 : Schematic diagram of the overall structure of the hollow crescent-shaped raised compression-resistant steel pipe pile

[0012] Figure 2 : Front view of the hollow crescent-shaped raised compression steel pipe pile

[0013] Figure 3 : Top view of hollow crescent-shaped raised compression steel pipe pile

[0014] Figure 4 : Bottom view of hollow crescent-shaped raised compression steel pipe pile

[0015] Figure 5 : Top view of the crescent bulge

[0016] Figure 6 : Schematic diagram of the crescent bulge structure

[0017] Figure 7 : Front view of the crescent bulge

[0018] 1: pile body; 2: crescent protrusion; L: crescent protrusion length; H: crescent protrusion height; a: array spacing; b: smooth surface length DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0020] A hollow crescent-shaped convex compression-resistant steel pipe pile, characterized in that it comprises a pile body (1) and a crescent-shaped convexity (2). The crescent-shaped convexity is distributed in a ring array and punched into holes in the pile body. (See Figure 1 )

[0021] In this embodiment, the crescent protrusions are distributed in a circular array horizontally and spaced apart from the smooth surface vertically; the array spacing (a) and the smooth surface length (b) are determined according to soil parameters. (See Figure 2 )

[0022] In this embodiment, the crescent protrusion is open downward and hollow inside. (See Figure 3 、 Figure 4 )

[0023] In this embodiment, the crescent protrusion is set according to the load conditions to set the crescent protrusion length (L) and height (H) combination to improve the vertical bearing capacity of the foundation. (See Figure 5 , Figure 6 , Figure 7 )

[0024] In this embodiment, the cross-section of the crescent protrusion is a combination of an ellipse and a circle, wherein the minor axis of the ellipse is equal to the radius of the circle. (See Figure 7 )

[0025] In this embodiment, the hollow crescent-shaped compression-resistant steel pipe pile is manufactured using steel. First, the diameter and wall thickness of the steel pipe pile are determined based on geological survey data, and the dimensions and layout of the crescent-shaped protrusions are designed. The crescent-shaped protrusions are then stamped out of steel plate, and finally, the hollow crescent-shaped compression-resistant steel pipe pile is produced by spiral welding.

[0026] In this embodiment, a construction method for a hollow crescent-shaped raised compression-resistant steel pipe pile is as follows: after the pile-driving ship drops anchor and positions, the hollow crescent-shaped raised compression-resistant steel pipe pile is positioned; the pile is then sunk. After the pile is in place, the anchor cable on the pile-driving ship is tightened to maintain the pile position and the hull stable, and the pile is sunk under the action of its own weight, and the change in the pile position is monitored; then the pile hammer is started to drive the pile to the specified depth, and the installation is completed.

[0027] The above description is only one embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A hollow crescent-shaped convex compression steel pipe pile, characterized in that: The pile comprises a cylindrical pile body and a crescent protrusion. The crescent protrusion is distributed in a ring array and is punched into a hollow shape on the pile body.

2. A hollow crescent-shaped compression-resistant steel pipe pile according to claim 1, wherein the cross-section of the crescent-shaped protrusion is a combined cross-section of an ellipse and a circle, wherein the minor axis of the ellipse is equal to the radius of the circle.

3. A hollow crescent-shaped compression-resistant steel pipe pile according to claim 1, wherein the crescent-shaped protrusion is open downward and hollow inside.

4. A hollow crescent-shaped compression-resistant steel pipe pile according to claim 1, wherein the crescent-shaped protrusions are distributed in a ring array horizontally and are spaced apart from the smooth surface vertically; the array spacing (a) and the smooth surface length (b) are determined according to soil parameters to avoid overly dense distribution that affects the pile-soil interaction and thus affects the compressive bearing capacity.

5. The hollow crescent-shaped compression-resistant steel pipe pile according to claim 1, wherein the length (L) and height (H) of the crescent-shaped protrusion are combined according to the load to improve the vertical bearing capacity of the steel pipe pile.

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