Prestressed core column socketed pile structure

Abstract

The utility model discloses a pre-stressed core column socketed pile structure in the technical field of offshore new energy, the pre-stressed core column socketed pile structure comprises a precast concrete block type core column, a steel pipe pile, drilling equipment and a rock mass, the bottom of the steel pipe pile is embedded into the rock mass, the precast concrete block type core column is arranged in the steel pipe pile and the rock mass, and the drilling equipment is arranged in the precast concrete block type core column. A grouting pipe is arranged among the prefabricated concrete block type core column, the steel pipe pile and the rock mass, the grouting pipe is filled with grouting materials, and a prefabricated concrete cushion block is arranged between the bottom of the prefabricated concrete block type core column and the inner bottom wall of the rock mass. The prefabricated concrete block type core column is adopted to replace a conventional reinforcement cage, production can be completed in a factory, the prefabricated concrete block type core column is of a columnar concrete structure, stacking and long-distance transportation are convenient, meanwhile, the prefabricated concrete cushion block is arranged on the lower portion of the prefabricated concrete block type core column, and the prefabricated concrete block type core column is not prone to deformation. The prefabricated concrete block type core column is convenient to arrange, and enough protective layer thickness is provided for the bottom steel structure of the prefabricated concrete block type core column.

Description

Technical Field

[0001] The utility model relates to the technical field of offshore new energy, in particular to a prestressed core column rock-embedded pile structure. Background Art

[0002] Offshore renewable energy power stations are built in the ocean, converting renewable energy sources like wind and solar energy into electricity. Due to the influence of the marine environment, the foundations of offshore renewable energy power stations must withstand additional wave and current loads, ice loads, and higher horizontal wind loads. Furthermore, to minimize the impact of the power station foundation on the marine environment, particularly ocean currents, offshore renewable energy power station designs often utilize low-density pile foundations.

[0003] Chinese patent authorization announcements CN221118542U and CN219527722U both effectively address the horizontal bending problem of offshore renewable energy foundations under wind loads, wave loads, and ice loads, such as offshore photovoltaics. However, they cannot address the pullout resistance of offshore renewable energy power station foundations under wind loads. This is especially true when offshore renewable energy power stations are located in typhoon zones with shallow bedrock depths. The soil above the bedrock layer cannot provide sufficient pullout bearing capacity for photovoltaic support piles. Conventional rock-embedded piles are difficult to construct offshore, resulting in the following problems:

[0004] (1) Difficulty in transportation and installation. Traditional rock-embedded pile reinforcement cages cannot be stacked in multiples, and are prone to deformation during long-distance transportation and installation, which affects the lifting of the reinforcement cage.

[0005] (2) It is difficult to prevent corrosion of steel cage structures in marine environments. Traditional rock-embedded piles require steel cages to be tied on site before construction. The quality of the steel cages is poor. Offshore photovoltaic projects are located at the seaside and are often accompanied by salt spray. It is difficult to take anti-corrosion measures for the steel cages after they are tied. The steel cages are easily corroded by salt spray during the tying process and easily corroded by seawater after the hoisting is completed, resulting in weakened structural strength.

[0006] (3) Complex construction process. Before the construction of traditional rock-embedded piles, a steel sleeve needs to be separately installed on the outside of the drill bit. That is, the steel sleeve structure needs to be constructed before drilling. After the drilling construction is completed, the steel sleeve needs to be removed. The construction process is relatively complicated.

[0007] (4) Unable to apply prestress. Offshore photovoltaic piles need to have large bending and pull-out bearing capacities. Proper application of prestress to the steel bars can help improve the bending bearing capacity of the pile foundation, thereby reducing the engineering workload of the pile foundation. Traditional pile foundations cannot apply prestress to the steel cage. Utility Model Content

[0008] In order to improve the above-mentioned problems that the traditional rock-embedded pile reinforcement cages cannot be stacked in multiples and are prone to deformation during long-distance transportation and installation, which affects the lifting of the reinforcement cages, the utility model provides a prestressed core column rock-embedded pile structure.

[0009] The utility model is realized through the following technical solutions:

[0010] A prestressed core column rock-embedded pile structure includes a precast concrete block core column, a steel pipe pile, drilling equipment and a rock mass. The bottom of the steel pipe pile is embedded in the rock mass, and the precast concrete block core column is placed between the steel pipe pile and the rock mass. A grouting pipe is provided between the precast concrete block core column, the steel pipe pile and the rock mass, and the interior of the grouting pipe is filled with grouting material. A precast concrete pad is provided between the bottom of the precast concrete block core column and the inner bottom wall of the rock mass.

[0011] By adopting the above technical solution, the precast concrete block core column, steel pipe pile and precast concrete pad are prefabricated in the factory and then transported to the designated location at sea, the steel pipe pile is placed on the top of the rock mass, and drilling equipment is used to complete the drilling of the rock mass inside the steel pipe pile, and the drilled hole is cleaned, and the precast concrete pad is installed at the bottom of the precast concrete block core column, which facilitates the placement of the precast concrete block core column and provides a sufficient protective layer thickness for its bottom steel structure. At the same time, the grouting work of the grouting material inside the steel pipe pile is completed through the grouting pipe, and the installation of the prestressed core column rock-embedded pile structure is completed.

[0012] Optionally, the precast concrete block core column includes prestressed concrete, and steel end plates are installed on the top and bottom of the prestressed concrete. A lifting lug is provided on the upper part of the top steel end plate. Prestressed tendons are embedded in the interior of the prestressed concrete, and the exterior of the steel end plates, lifting lugs and prestressed tendons are coated with an anti-corrosion coating. Fixing clips are embedded in the interior and exterior of the prestressed concrete.

[0013] By adopting the above technical solution, the anti-corrosion coating is provided to prevent the steel end plates, lifting lugs and prestressed tendons from corroding when stacked at the seaside and installed in seawater, and the fixing clamp is provided to fix the grouting pipe.

[0014] Optionally, a lifting rope is wound around the lifting ear, and the lifting ear includes a main steel plate, which is arranged on the top of the steel end plate. Load-bearing circular tubes are provided on both sides of the main steel plate, and an annular sealing plate is provided on the side of the load-bearing circular tube facing away from the main steel plate.

[0015] By adopting the above technical solution, the lifting rope can be passed around the load-bearing circular tube and then installed on the precast concrete block core column.

[0016] Optionally, the prestressed tendons include prestressed steel rods, both ends of the prestressed steel rods are provided with threads, and prestressed nuts are provided on the threads at both ends of the prestressed steel rods.

[0017] By adopting the above technical solution, in combination with the steel end plates and prestressed concrete, prestress can be applied to the prestressed steel rods.

[0018] Optionally, a plurality of reserved holes are opened inside the steel end plate, and both ends of the prestressed steel rod extend out of the reserved holes.

[0019] By adopting the above technical solution, both ends of the prestressed steel rod can be conveniently extended out of the reserved holes and threadedly connected with the prestressed nuts.

[0020] Optionally, the steel pipe pile includes a steel pipe section, a steel pipe cone section is provided at the bottom of the steel pipe section, a plurality of ribs are provided between the steel pipe section and the steel pipe cone section, and a guide steel plate is provided at one end of the steel pipe section near the ribs, and the guide steel plate is located above the ribs.

[0021] By adopting the above technical solution, the setting of the steel pipe cone section makes it easier for the steel pipe pile to enter the rock mass as much as possible during the pile sinking process. The setting of the ribs prevents the steel pipe pile from being damaged during the pile sinking process. It also helps to ensure the close combination of the grouting material and the steel pipe pile after the pile foundation construction is completed. The setting of the guide steel plate facilitates the installation of the precast concrete block core column to the designated position.

[0022] Optionally, a screw hole is provided on the top of the precast concrete pad, and the inside of the screw hole is threadedly connected to the bottom of the prestressed steel rod.

[0023] By adopting the above technical solution, it is convenient to install the precast concrete pad at the bottom of the precast concrete block core column and provide a sufficient protective layer thickness for the bottom steel structure.

[0024] In summary, the present invention has at least one of the following beneficial effects:

[0025] By replacing conventional steel cages with precast concrete block core columns, production can be completed in the factory and quality can be controlled. The structure of the precast concrete block core columns is a columnar concrete structure, which is convenient for stacking and long-distance transportation. At the same time, precast concrete pads are provided at the bottom of the precast concrete block core columns to facilitate the placement of the precast concrete block core columns and provide sufficient protective layer thickness for the bottom steel structure.

[0026] By setting a lifting lug on the top of the steel end plate at the upper end of the precast concrete block core column, it is convenient to lift the precast concrete block core column. By setting the anti-corrosion coating, it is convenient to stack it in the marine environment for a short period of time, and it is not easy to be corroded when immersed in seawater during construction.

[0027] By setting prestressed tendons inside prestressed concrete, prestress can be applied to the prestressed concrete during the production stage, so that it has better bending resistance when the same amount of reinforced concrete material is used, thereby reducing the overall engineering workload of the project.

[0028] The setting of the steel pipe cone section makes it easier for the steel pipe pile to enter the rock mass as much as possible during the pile sinking process. The setting of the ribs prevents the steel pipe pile from being damaged during the pile sinking process, and also helps to ensure the close combination of the grouting material and the steel pipe pile after the pile foundation construction is completed. The setting of the guide steel plate facilitates the installation of the precast concrete block core column to the designated position. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 This is a plan view of the precast concrete block core column of the present utility model;

[0031] Figure 2 This is a cross-sectional view of the precast concrete block core column of the present utility model;

[0032] Figure 3 This is a schematic diagram of the top steel end plate structure of the utility model;

[0033] Figure 4 For this utility model Figure 3 Schematic diagram of the top view structure;

[0034] Figure 5 This is a schematic diagram of the connection structure of the precast concrete pad and prestressed tendons of the present utility model;

[0035] Figure 6 This is a schematic diagram of the overall top view of the structure of the utility model;

[0036] Figure 7 This is a schematic diagram of the overall cross-sectional structure of the utility model;

[0037] Figure 8 This is a schematic diagram of the connection structure between the steel pipe pile and the rock mass of the utility model;

[0038] Figure 9 This is a schematic diagram of the construction structure of the drilling equipment of the present utility model;

[0039] Figure 10 This is a schematic diagram of the precast concrete block core column hoisting and grouting structure of the utility model.

[0040] In the figure: 1. Precast concrete block core column; 11. Steel end plate; 112. Reserved hole; 12. Prestressed concrete; 13. Lifting lug; 131. Main steel plate; 132. Load-bearing circular tube; 133. Annular cover plate; 14. Prestressed tendons; 141. Prestressed steel rod; 142. Prestressed nut; 15. Anti-corrosion coating; 16. Fixing clamp; 2. Steel pipe pile; 21. Steel pipe section; 22. Steel pipe cone section; 23. Rib; 24. Guide steel plate; 3. Precast concrete pad; 31. Screw hole; 4. Grouting material; 5. Grouting pipe; 6. Lifting rope; 7. Drilling equipment; 8. Rock mass. DETAILED DESCRIPTION

[0041] The following is combined with Figure 1-10 The utility model is described in further detail.

[0042] Please refer to the attached figure in the instruction manual Figure 1 、 Figure 2 、 Figure 7 、 Figure 8 and Figure 9 This embodiment introduces a prestressed core column rock-embedded pile structure, including a precast concrete block core column 1, a steel pipe pile 2, a drilling device 7 and a rock mass 8. The bottom of the steel pipe pile 2 is embedded in the rock mass 8, and the precast concrete block core column 1 is placed in the steel pipe pile 2 and the rock mass 8. The height ratio of the precast concrete block core column 1 inside the steel pipe pile 2 and the rock mass 8 is 1.5:1. A grouting pipe 5 is arranged between the precast concrete block core column 1, the steel pipe pile 2 and the rock mass 8. The precast concrete block core column 1 includes prestressed concrete 12. Steel end plates 11 are installed on the top and bottom of the prestressed concrete 12. A lifting lug 13 is provided on the upper part of the top steel end plate 11. Prestressed tendons 14 are embedded in the interior of the prestressed concrete 12. The exterior of the steel end plate 11, the lifting lug 13 and the prestressed tendons 14 are coated with an anti-corrosion coating 15. Fixing clips 16 are embedded in the interior and exterior of the prestressed concrete 12. The anti-corrosion coating 15 prevents the steel end plates 11 , the lifting lugs 13 and the prestressed tendons 14 from corroding when they are stacked at the seaside or installed in seawater. The fixing clamps 16 are used to fix the grouting pipes 5 .

[0043] Please refer to the attached figure in the instruction manual Figure 2 、 Figure 3 、 Figure 4 and Figure 10 The lifting lug 13 is wound with a lifting rope 6. The lifting lug 13 includes a main steel plate 131, which is arranged on the top of the steel end plate 11. Both sides of the main steel plate 131 are provided with load-bearing circular tubes 132. The side of the load-bearing circular tube 132 facing away from the main steel plate 131 is provided with an annular sealing plate 133. In this way, the lifting rope 6 can be passed around the load-bearing circular tube 132 and then installed on the precast concrete block core column 1.

[0044] Please refer to the attached figure in the instruction manual Figure 1 、 Figure 2 、 Figure 3 、 Figure 5 and Figure 6 The prestressed tendons 14 include a prestressed steel rod 141. Both ends of the prestressed steel rod 141 are provided with threads, and prestressed nuts 142 are provided on the threads at both ends of the prestressed steel rod 141. When used in conjunction with the steel end plate 11 and the prestressed concrete 12, prestress can be applied to the prestressed steel rod 141. A plurality of reserved holes 112 are opened inside the steel end plate 11, and both ends of the prestressed steel rod 141 extend out of the reserved holes 112. It is convenient for the two ends of the prestressed steel rod 141 to extend out of the reserved holes 112 and be threadedly connected with the prestressed nuts 142.

[0045] Please refer to the attached figure in the instruction manual Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 and Figure 10 The interior of the grouting pipe 5 is filled with grouting material 4 to a depth of approximately 70 mm above the precast concrete block core column 1. The steel pipe pile 2 includes a steel pipe section 21. A steel pipe tapered section 22 is provided at the bottom of the steel pipe section 21. A plurality of ribs 23 are provided between the steel pipe section 21 and the steel pipe tapered section 22. A guide steel plate 24 is provided at one end of the steel pipe section 21 near the ribs 23, and the guide steel plate 24 is located above the ribs 23. The provision of the steel pipe tapered section 22 facilitates the steel pipe pile 2 to enter the rock mass 8 as much as possible during the pile sinking process. The provision of the ribs 23 prevents damage to the steel pipe pile 2 during the pile sinking process and also facilitates the close integration of the grouting material 4 and the steel pipe pile 2 after the pile foundation construction is completed. The provision of the guide steel plate 24 facilitates the installation of the precast concrete block core column 1 to the designated position.

[0046] Please refer to the attached figure in the instruction manual Figure 5 、 Figure 7 and Figure 10 A precast concrete pad 3 is provided between the bottom of the precast concrete block core column 1 and the inner bottom wall of the rock mass 8. The height of the precast concrete pad 3 is not less than 70 mm. A screw hole 31 is provided at the top of the precast concrete pad 3, and the interior of the screw hole 31 is threadedly connected to the bottom of the prestressed steel rod 141. This facilitates the installation of the precast concrete pad 3 at the bottom of the precast concrete block core column 1 and provides a sufficient protective layer thickness for the bottom steel structure.

[0047] The prestressed core column rock-embedded pile structure can not only be used for offshore photovoltaics, but can also be applied to offshore wind turbine foundations and offshore booster stations in shallow overburden sea areas.

[0048] The above are all preferred embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A prestressed core column rock-embedded pile structure, comprising a precast concrete block core column (1), a steel pipe pile (2), a drilling device (7) and a rock mass (8), characterized in that: The bottom of the steel pipe pile (2) is embedded in the rock mass (8), the precast concrete block core column (1) is placed in the steel pipe pile (2) and the rock mass (8), a grouting pipe (5) is provided between the precast concrete block core column (1), the steel pipe pile (2) and the rock mass (8), the interior of the grouting pipe (5) is filled with grouting material (4), and a precast concrete pad (3) is provided between the bottom of the precast concrete block core column (1) and the inner bottom wall of the rock mass (8).

2. The prestressed core column rock-socketed pile structure according to claim 1, characterized in that: The precast concrete block core column (1) comprises prestressed concrete (12), the top and bottom of the prestressed concrete (12) are both installed with steel end plates (11), the upper part of the top steel end plate (11) is provided with a lifting lug (13), the interior of the prestressed concrete (12) is pre-embedded with a prestressed tendon (14), the exterior of the steel end plate (11), the lifting lug (13) and the prestressed tendon (14) are all coated with an anti-corrosion coating (15), and the interior and exterior of the prestressed concrete (12) are both pre-embedded with a fixing clip (16).

3. The prestressed core column rock-socketed pile structure according to claim 2, characterized in that: A lifting rope (6) is wound around the lifting lug (13), and the lifting lug (13) includes a main steel plate (131). The main steel plate (131) is arranged on the top of the steel end plate (11), and load-bearing circular tubes (132) are arranged on both sides of the main steel plate (131). An annular sealing plate (133) is arranged on the side of the load-bearing circular tube (132) facing away from the main steel plate (131).

4. The prestressed core column rock-socketed pile structure according to claim 2, characterized in that: The prestressed tendon (14) comprises a prestressed steel rod (141), both ends of the prestressed steel rod (141) are provided with threads, and prestressed nuts (142) are provided on the threads at both ends of the prestressed steel rod (141).

5. The prestressed core column rock-socketed pile structure according to claim 4, characterized in that: A plurality of reserved holes (112) are provided inside the steel end plate (11), and both ends of the prestressed steel rod (141) extend out of the reserved holes (112).

6. The prestressed core column rock-socketed pile structure according to claim 2, characterized in that: The steel pipe pile (2) comprises a steel pipe section (21), a steel pipe cone section (22) is provided at the bottom of the steel pipe section (21), a plurality of ribs (23) are provided between the steel pipe section (21) and the steel pipe cone section (22), and a guide steel plate (24) is provided at one end of the steel pipe section (21) close to the ribs (23), and the guide steel plate (24) is located above the ribs (23).

7. The prestressed core column rock-socketed pile structure according to claim 5, characterized in that: A screw hole (31) is provided on the top of the precast concrete pad (3), and the inside of the screw hole (31) is threadedly connected to the bottom of the prestressed steel rod (141).

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