Fabricated concrete high-pile bearing platform foundation for water photovoltaic and construction method of fabricated concrete high-pile bearing platform foundation

Abstract

The invention discloses an assembly type high-pile bearing platform foundation for water photovoltaic and a construction method thereof. The assembly type high-pile bearing platform foundation comprises a high-pile bearing platform, a photovoltaic net rack support and a water photovoltaic net rack which are sequentially arranged from bottom to top. The high pile bearing platform comprises a bearing platform, and a vertical foundation pile and an inclined foundation pile which are connected with the bearing platform in an inserting manner, are fixed at the bottom of the bearing platform through secondary concrete pouring, and the photovoltaic grid support is centrally fixed at the top of the bearing platform and is provided with a connecting node fixed with the overwater photovoltaic grid; the overwater photovoltaic net rack is fixed on the top surface of each photovoltaic net rack support in a horizontal or inclined manner; according to the assembly type concrete high-pile bearing platform foundation, the specific structure is designed according to actual requirements, force transmission is clear, all components are prefabricated and then conveyed to a construction site to be assembled, the problems that a traditional single high-pile bearing platform is large in weight, large in size, large in cast-in-place construction work amount and the like are effectively solved, the construction efficiency is improved, and the construction cost is controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of water photovoltaic construction on water surfaces, lakes, near seas, offshore seas, etc., and in particular to an assembled concrete high pile cap foundation for water photovoltaics and a construction method thereof. Background Art

[0002] In the context of energy transformation, solar energy is favored as a clean energy source. Water photovoltaics are increasingly valued because of their advantages such as not occupying land resources and good lighting and cooling conditions. They are in urgent need of adapting to the construction of foundation support, which has promoted the research of prefabricated concrete high-pile foundation. From the perspective of the construction environment, water photovoltaics are mostly located in complex waters such as lakes and offshore areas, with large water level changes, complex water currents and wind and waves, and conventional foundations are difficult to adapt to. The piles of this foundation can penetrate into stable strata, and the foundation can provide a connection platform, which is expected to cope with complex environments. At the same time, water construction is difficult, and its prefabricated concept can reduce the amount of water operations and shorten the construction period, which meets the construction needs. The foundation cost accounts for a large proportion of water photovoltaic projects. Prefabricated factories can control costs, reduce losses, and save construction costs. Considering the entire life cycle, its durability and easy maintenance are good after reasonable design, which is conducive to long-term stable power generation and improved comprehensive benefits. Summary of the invention

[0003] The purpose of the present invention is to provide an assembled concrete high pile foundation for water photovoltaics that solves the above-mentioned technical problems.

[0004] Another object of the present invention is to provide a construction method for the above-mentioned assembled concrete high-pile foundation for water photovoltaics.

[0005] To this end, the technical solution of the present invention is as follows:

[0006] An assembled concrete high-pile cap foundation for water photovoltaics, comprising a high-pile cap, a photovoltaic grid support and a water photovoltaic grid arranged in sequence from bottom to top; at least four high-pile caps are provided; each high-pile cap comprises a cap, and at least one oblique foundation pile and at least one vertical foundation pile uniformly arranged at the bottom of the cap along the circumferential direction, and a plurality of oblique foundation piles and a plurality of vertical foundation piles are distributed on both sides of the bottom of the cap; the number of photovoltaic grid supports is the same as the number of high-pile caps, which are respectively and one-to-one vertically fixed at the center of the top surface of the cap; the heights of the photovoltaic grid supports are the same or different, so that the water photovoltaic grid is fixed on the top surface of each photovoltaic grid support in a horizontal or oblique manner.

[0007] Furthermore, the support platform can be a load-bearing platform body with a circular or polygonal (such as rectangular) radial cross section.

[0008] Furthermore, pile tip steels are arranged at four connection positions on the bottom surface of the pedestal for connecting the inclined foundation piles and the vertical foundation piles; the top end of the inclined foundation pile is connected to an inclined foundation pile extension section, which is a tube body with a closed bottom end; the inclined foundation pile extension section is coaxially arranged with the inclined foundation pile, and the top surface is a horizontal plane; an inner partition is horizontally fixed on the inner wall of the top side of the vertical foundation pile to separate a chamber on the top side of the vertical foundation pile; the inclined foundation pile is plug-connected to the pile tip steel through the inclined foundation pile extension section, and the vertical foundation pile is plug-connected to the pile tip steel through the top side chamber.

[0009] Furthermore, the pile tip steel adopts a columnar body with a cross-shaped radial section, which is partially inserted and fixed on the bottom surface of the base.

[0010] Furthermore, grouting ports and grouting exhaust ports are symmetrically opened on the top end faces of the inclined pile extension section and the vertical pile; core-filling concrete is poured into the inner cavity of the inclined pile extension section and the inner cavity on the top side of the vertical pile; the strength grade of the core-filling concrete is consistent with the strength grade of the foundation concrete, and an expansion agent is added therein to cause the concrete to expand in volume by 0.05% to 0.2% during solidification.

[0011] Furthermore, pile holes penetrating the pedestal are provided at four connection positions on the bottom surface of the pedestal for connecting the oblique foundation piles and the vertical foundation piles, and internal steel sections are horizontally arranged in each pile hole so that the top ends of the oblique foundation piles and the vertical foundation piles inserted in the pile holes are against the bottom surface of the internal steel sections; a closed annular support plate is sleeved on the outer side of each oblique foundation pile and vertical foundation pile, and its top surface is fixed on the bottom surface of the pedestal.

[0012] Furthermore, the internal steel sections are arranged in a cross shape or a tic-tac-toe shape in the pile hole.

[0013] Furthermore, a plurality of reinforcing ribs are evenly distributed along the circumferential direction on the top outer walls of each oblique foundation pile and each vertical foundation pile, and the top surface of each reinforcing rib is fixed on the bottom surface of the closed annular support plate.

[0014] Furthermore, core-filling concrete is poured into each pile hole; the strength grade of the core-filling concrete is adapted to the strength grade of the cap concrete, and an expansion agent is added therein to cause the concrete to expand in volume by 0.05% to 0.2% during solidification.

[0015] Furthermore, the photovoltaic grid support includes a support tube, four support steel sections and a connection node which are arranged in sequence from top to bottom; the support tube is arranged vertically, and its bottom end is fixed at the center of the top surface of the base; the bottom ends of the four support steel sections are fixed on the top surface of the support tube along the circumferential direction, and the top ends of the four are fixed on the steel connection node located directly above the support tube; the connection node is a spherical body for fixing to the connection node on the photovoltaic grid.

[0016] Furthermore, the foundation is a precast concrete member with a steel member built in; the inclined foundation piles and the vertical foundation piles are concrete piles or steel pipe piles with a steel member built in.

[0017] A construction method for the above-mentioned assembled concrete high pile foundation for water photovoltaics, the steps are as follows:

[0018] S1. In the factory, the cap, inclined piles and vertical piles are manufactured and transported to the construction site;

[0019] S2. Use special ship equipment to complete the driving of oblique foundation piles and vertical pipe piles, and connect and fix the cap to the top of the corresponding oblique foundation piles and vertical pipe piles;

[0020] S3, tie the steel bars and grout the plug-in connection between the cap and the foundation pile;

[0021] S4. Install the photovoltaic grid support and the water photovoltaic grid on the high pile foundation in sequence.

[0022] Compared with the prior art, the beneficial effects of the assembled concrete high pile foundation for water photovoltaics include:

[0023] (1) Compared with the current technical status that traditional cast-in-place technology requires a series of processes such as formwork, steel bar tying, and concrete pouring on the water site, which is restricted by the water working environment, the construction progress is easily affected by factors such as weather and water level changes, and the connection of each process takes a long time, most of the components of the prefabricated concrete high pile foundation can be produced in advance in a standardized manner in a prefabrication factory on land, and after prefabrication, they can be transported to the water site for rapid assembly, which reduces the construction time on the water, can effectively shorten the construction period of the entire project, and speed up the operation of the water photovoltaic power station;

[0024] (2) Compared with the current technical status that traditional cast-in-place construction is carried out on water, the site environment is complex, the quality of concrete pouring is affected by many factors such as the construction personnel's operating level and the degree of on-site vibration compaction, and the quality fluctuation is relatively large, this prefabricated concrete high pile foundation produces components in a prefabrication factory. It can rely on the factory's standardized production process and strict quality inspection process to better ensure the dimensional accuracy of the components, concrete strength and other quality indicators, making the overall quality of the foundation more stable and reliable;

[0025] (3) From the perspective of construction cost, compared with the current technical status that traditional cast-in-place construction requires long-term occupation of the water construction platform and supporting mechanical equipment, high equipment rental costs, and difficulty in on-site material management, resulting in a lot of waste, the prefabricated components of this prefabricated foundation are produced in land factories, which can effectively reduce the use time of water construction equipment. At the same time, factory production can accurately control the amount of materials used, reduce material waste, and thus save construction costs;

[0026] (4) The assembled concrete high pile foundation has clear force transmission and reduces the workload at the node connections. All components can be prefabricated in the factory and quickly connected at the construction site, which improves assembly efficiency. It is suitable for the photovoltaic field on water surfaces, lakes, near seas, and offshore waters. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic structural diagram of an assembled concrete high pile foundation for water photovoltaics according to Example 1 of the present invention;

[0028] Figure 2 It is a top view of the assembled concrete high pile foundation for water photovoltaics according to Example 1 of the present invention;

[0029] Figure 3 It is a structural schematic diagram of an oblique foundation pile extension section of an assembled concrete high-pile foundation for water photovoltaics according to Example 1 of the present invention, in which oblique foundation piles are not installed;

[0030] Figure 4 It is a structural schematic diagram of an oblique foundation pile extension section for installing an oblique foundation pile of an assembled concrete high-pile cap foundation for water photovoltaics according to Example 1 of the present invention;

[0031] Figure 5 A top view of a high pile cap of an assembled concrete high pile cap foundation for water photovoltaics according to Example 1 of the present invention;

[0032] Figure 6 It is a side view of a high pile cap of an assembled concrete high pile cap foundation for water photovoltaics according to Example 1 of the present invention;

[0033] Figure 7 It is a top view of the assembled concrete high pile cap foundation for water photovoltaics after the installation of the assembled concrete high pile cap foundation for water photovoltaics in Example 1 of the present invention is completed;

[0034] Figure 8 It is a front view of the assembled concrete high pile cap foundation for water photovoltaics after the installation of the assembled concrete high pile cap foundation for water photovoltaics in Example 1 of the present invention is completed;

[0035] Fig. 9 This is a schematic structural diagram of an assembled concrete high pile foundation for water photovoltaics according to Embodiment 3 of the present invention;

[0036] Fig.10 A top view of an assembled concrete high pile cap foundation for water photovoltaics according to Embodiment 3 of the present invention;

[0037] Fig.11A top view of a high pile cap of an assembled concrete high pile cap foundation for water photovoltaics according to Example 3 of the present invention;

[0038] Fig.12 A side view of a high pile cap of an assembled concrete high pile cap foundation for water photovoltaics according to Embodiment 3 of the present invention;

[0039] Fig.13 It is a top view of the assembled concrete high pile cap foundation for water photovoltaics after the installation of the assembled concrete high pile cap foundation for water photovoltaics in Example 3 of the present invention is completed;

[0040] Fig.14 This is a front view of the assembled concrete high pile cap foundation for water photovoltaics after installation is completed according to Example 3 of the present invention. This is a front view of the assembled concrete high pile cap foundation after installation is completed. DETAILED DESCRIPTION

[0041] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the following embodiments are by no means intended to limit the present invention in any way.

[0042] Example 1

[0043] See also Figure 1 and Figure 2 The assembled concrete high pile foundation for water photovoltaics includes four high pile foundations 3, four photovoltaic grid supports 2 and a water photovoltaic grid 1 which are arranged in sequence from bottom to top.

[0044] The high pile cap 3 includes a square cap, and two inclined foundation piles 4 and two vertical foundation piles 5 evenly distributed along the circumferential direction at the bottom of the cap; the two inclined foundation piles 4 and the two vertical foundation piles 5 are symmetrically arranged on both sides of the bottom of the cap, and the top of each inclined foundation pile 4 and vertical foundation pile 5 is connected to the bottom surface of the cubic cap; in this embodiment, the inclined foundation piles 4 and the vertical foundation piles 5 are steel pipe piles.

[0045] In the structural design of the high pile cap 3, two vertically arranged vertical foundation piles 5 serve as the supporting body, and two inclined foundation piles 4 are arranged on one side of the two vertical foundation piles 5 so as to apply force toward the other side of the two vertical foundation piles 5 to the vertical foundation piles 5 through the inclined supporting force; based on this, in actual application, the four high pile caps 3 are evenly distributed along the circumferential direction, and the inclined foundation piles 4 of each high pile cap 3 are arranged toward the outside of the annular area surrounded by the four high pile caps 3.

[0046] In order to facilitate construction, the cap and the oblique foundation pile 4, and the cap and the vertical foundation pile 5 are connected by plug-in fixing; specifically,

[0047] See also Figure 5 and Figure 6, pile tip steels 10 are arranged at four connection positions on the bottom surface of the cap for connecting the oblique foundation piles 4 and the vertical foundation piles 5. The pile tip steels 10 are cylindrical bodies with a cross-shaped radial cross section, and are partially inserted and fixed on the bottom surface of the cap; on the bottom surface of the cap, at the positions for connecting the oblique foundation piles 4, the pile tip steels 10 are obliquely inserted and fixed on the bottom surface of the cap, while at the positions for connecting the vertical foundation piles 5, the pile tip steels 10 are vertically inserted and fixed on the bottom surface of the cap; in this embodiment, the cap is a prefabricated concrete component, and the pile tip steels 10 are pre-arranged on the bottom surface of the cap when the cap is cast; and, at the positions for connecting the oblique foundation piles 4, the oblique insertion angle of the pile tip steels 10 can be adjusted according to the actual application conditions to ensure convenient assembly under reasonable force conditions;

[0048] See also Figure 3 and Figure 4 An oblique pile extension section 7 is arranged at the top of the oblique pile 4. The oblique pile extension section 7 is coaxially arranged with the oblique pile 4, and its top surface is a horizontal plane, and its bottom surface is connected and fixed to the top surface of the oblique pile 4; in this embodiment, the oblique pile extension section 7 is a cylindrical steel pipe with a closed bottom end, which is welded and fixed to the top of the oblique pile 4 as a whole; as a preferred technical solution of this embodiment, reinforcing ribs are arranged at intervals along the circumferential direction on the inner wall of the oblique pile extension section 7 to improve its vertical bearing capacity.

[0049] See also Figure 3 and Figure 4 An inner partition plate 6 is horizontally fixed on the inner wall of the top side of the vertical foundation pile 5 to separate an independent chamber on the top side of the vertical foundation pile 5; in the present embodiment, the inner partition plate 6 is a circular steel plate whose outer diameter is adapted to the inner diameter of the vertical foundation pile 5, and is welded and fixed on the inner wall of the vertical foundation pile 5; in actual application, the oblique foundation pile extension section 7 and the inner partition plate 6 are respectively connected and fixed after the oblique foundation pile 4 and the vertical foundation pile 5 are installed in place, and the integrity of the interface must be ensured.

[0050] In order to further increase the connection tightness between the pedestal and the inclined pile 4, and between the pedestal and the vertical pile 5, the inner cavity of the inclined pile extension section 7 and the independent chamber separated by the upper part of the vertical pile 5 are also used as grouting chambers. Correspondingly, grouting ports 8 and grouting exhaust ports 9 are symmetrically opened on the top end faces of the inclined pile extension section 7 and the vertical pile 5 for later grouting operations; wherein, during the grouting operation, the top surfaces of the inclined pile extension section 7 and the vertical pile 5 should be tightly fitted with the bottom surface of the pedestal to prevent leakage; furthermore, the inclined pile 4 and the vertical pile 5 are respectively connected to the high pile pedestal 3 under the action of pouring core-filled concrete, and at the same time, the pile body of the vertical pile 5 can also be enhanced in terms of its ability to resist lateral pressure.

[0051] The outer diameter of the pile tip steel 10 is smaller than the diameter of the inclined pile extension section 7 and the vertical pile 5, so that the pile tip steel 10 can be inserted therein to temporarily support the secondary pouring of concrete on the prefabricated high pile cap 3 and form a whole.

[0052] In this embodiment, the strength grade of the cast-in-place concrete is similar to that of the cap concrete, but a small amount of expansion agent is added to the cast-in-place concrete to cause the concrete to expand in volume by 0.05% to 0.2% during solidification, so that the cast-in-place concrete is in close contact with the inner walls of the vertical piles 5 and the inclined pile extension sections 7, ensuring that the lateral force pressure of the pile body can be directly transmitted to the cast-in-place concrete.

[0053] See also Figure 2 , Figure 5 , Figure 6 and Figure 7 The photovoltaic grid support 2 is used to support the above-water photovoltaic grid 1, which includes a support pipe, four support steels 11 and a connection node 12 arranged in sequence from top to bottom; wherein the support pipe is arranged vertically, and its bottom end is fixed at the center of the top surface of the pedestal; in the present embodiment, the support pipe is a short steel pipe, and correspondingly, a steel member is pre-embedded at the position where the photovoltaic grid support 2 is connected on the top surface of the pedestal, so that the pedestal is connected and fixed by welding the pre-embedded steel member to the bottom end of the support pipe; the bottom ends of the four support steels 11 are welded and fixed to the support pipe along the circumferential direction, and the top ends of the four are fixed to the steel connection node 12 located directly above the support pipe; the connection node 12 is a spherical body, which serves as a welding point for welding and fixing with the connection node on the photovoltaic grid 1, so that the photovoltaic grid support 2 and the photovoltaic grid 1 can be assembled and fixed.

[0054] Among them, the support tube in each photovoltaic grid support 2 is composed of multiple sleeve-connected tube bodies; in actual application, the support tube adjusts the sleeve length of the two tube bodies according to the length requirements, and then welds and fixes each two adjacent tube bodies to make the support tube a tube body with a specified length.

[0055] The photovoltaic grid 1 is horizontally arranged by photovoltaic grid supports 2 having the same setting height, or is obliquely arranged by photovoltaic grid supports 2 having different setting heights; in this embodiment, the photovoltaic grid 1 adopts a steel structure grid support structure, and its specific setting angle is determined according to the optimal lighting angle of the photovoltaic panel corresponding to the installation location; Figure 1 As shown, the two photovoltaic grid supports 2 on the left have the same setting height, while the two photovoltaic grid supports 2 on the right have the same setting height, but are higher than the setting height of the two photovoltaic grid supports 2 on the left, so as to achieve an oblique setting of the photovoltaic grid 1 fixed on the top of the four photovoltaic grid supports 2.

[0056] Example 2

[0057] See also Figure 8, a construction method for a prefabricated concrete high pile foundation for water photovoltaics according to embodiment 1, wherein the specific implementation steps are as follows:

[0058] S1. In the factory, the high pile cap 3, the oblique foundation pile 4 and the vertical foundation pile 5 are manufactured, wherein the oblique foundation pile extension section 7 is welded on the oblique foundation pile 4 and transported to the construction site, and the oblique foundation pile 4 and the vertical foundation pile 5 are successively driven with the help of special ship equipment;

[0059] S2, the inclined pile extension section 7 is welded on the inclined pile 4 and cut to make it flush with the top of the vertical pile 5, and the high pile cap 3 is placed in the vertical pile extension section 6 and the inclined pile extension section 7 through the pile tip steel 10, so that the high pile cap 3 is horizontally placed on the top of the inclined pile 4 and the vertical pile 5;

[0060] S3, grouting the inner cavity of the vertical foundation pile 5 and the inclined foundation pile extension section 7;

[0061] S4. At the construction site, the connection between the water photovoltaic grid 1 and the photovoltaic grid support 2 is completed.

[0062] Example 3

[0063] See also Fig. 9 and Fig.10 The assembled concrete high pile foundation for water photovoltaics includes four high pile foundations 3, four photovoltaic grid supports 2 and a water photovoltaic grid 1 arranged in sequence from bottom to top. The difference between the embodiment 1 and the embodiment 1 is that:

[0064] The cap is a prefabricated concrete component, and four connection positions on its bottom surface for connecting the oblique foundation piles 4 and the vertical foundation piles 5 are reserved with pile holes 13 that penetrate the top and bottom surfaces of the cap, and the diameter of the pile hole is slightly larger than the diameter of the foundation pile to ensure that the top of the foundation pile can be inserted into the pile hole, and facilitate the secondary pouring of concrete from the top at the construction site;

[0065] An internal steel section 14 is horizontally arranged in the pile hole 13, which is pre-arranged therein when pouring the concrete cap and is used to temporarily support the secondary pouring of concrete on the high pile cap 3; see Fig.11 and Fig.13 In this embodiment, the built-in steel 14 is arranged in a cross shape in the pile hole. In actual application, the top ends of the oblique foundation piles 4 and the vertical foundation piles 5 inserted in the pile hole 13 are against the bottom surface of the built-in steel 14;

[0066] See also Fig.12 and Fig.14A closed annular support plate 17 is sleeved on the outer side of each inclined foundation pile 4 and vertical foundation pile 5, and the top surface of the closed annular support plate 17 is attached to and welded to the bottom surface of the base to serve as the end bottom plate of each pile hole; thereby, the pile hole 13 with the foundation pile inserted becomes a chamber that can be used for pouring core-filling concrete; a plurality of reinforcing ribs 15 are evenly distributed along the circumferential direction on the top outer wall of each inclined foundation pile 4 and each vertical foundation pile 5, and the top surface of each reinforcing rib 15 is welded to the bottom surface of the closed annular support plate 17.

[0067] Example 4

[0068] See also Fig. 9 , a construction method for a prefabricated concrete high pile foundation for water photovoltaics according to embodiment 3, wherein the specific implementation steps are as follows:

[0069] S1. In the factory, the high pile cap 3, the oblique foundation piles 4 and the vertical foundation piles 5 are manufactured and transported to the construction site. The oblique foundation piles 4 and the vertical pipe piles 5 are driven with the help of special ship equipment. A closed annular support plate 11 is welded on the oblique foundation piles 4 and the vertical pipe piles 5 at the bottom of the high pile cap 3.

[0070] S2, placing the high pile cap 3 on the top of the oblique oblique foundation pile 4 and the vertical pipe pile 5 through the pile hole 13, and completing the cutting of the oblique oblique foundation pile 4 in combination with the arrangement of the built-in steel 14, so that the high pile cap 3 is placed horizontally;

[0071] S3, tie the steel bars and complete the grouting of each pile hole 13;

[0072] S4. At the construction site, connect the water photovoltaic grid 1 with the photovoltaic grid support 2.

[0073] Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments, which are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can make many forms without departing from the scope of protection of the present invention and the claims, all of which fall within the scope of protection of the present invention.

Claims

1. An assembled concrete high pile foundation for water photovoltaics, characterized in that: The invention comprises a high pile cap (3), a photovoltaic grid support (2) and a water photovoltaic grid (1) which are arranged in sequence from bottom to top; at least four high pile caps (3) are arranged; each high pile cap (3) comprises a cap, and at least one oblique foundation pile (4) and at least one vertical foundation pile (5) which are evenly arranged at the bottom of the cap along the circumferential direction, and a plurality of oblique foundation piles (4) and a plurality of vertical foundation piles (5) are distributed on both sides of the bottom of the cap; the number of photovoltaic grid supports (2) is the same as the number of high pile caps (3), and they are respectively fixed vertically at the center of the top surface of the cap in a one-to-one correspondence; the heights of the photovoltaic grid supports (2) are the same or different, so that the water photovoltaic grid (1) is fixed on the top surface of each photovoltaic grid support (2) in a horizontal or oblique manner.

2. The assembled concrete high pile foundation for water photovoltaic according to claim 1 is characterized in that: Pile tip steel (10) is arranged at four connection positions on the bottom surface of the pedestal for connecting the inclined foundation pile (4) and the vertical foundation pile (5); the top of the inclined foundation pile (4) is connected to an inclined foundation pile extension section (7), which is a tube body with a closed bottom end; the inclined foundation pile extension section (7) is coaxially arranged with the inclined foundation pile (4), and the top surface is a horizontal plane; an inner partition plate (6) is horizontally fixed on the top inner wall of the vertical foundation pile (5) to separate a chamber on the top side of the vertical foundation pile (5); the inclined foundation pile (4) is plug-connected with the pile tip steel (10) through the inclined foundation pile extension section (7), and the vertical foundation pile (5) is plug-connected with the pile tip steel (10) through the top side chamber.

3. The assembled concrete high pile foundation for water photovoltaic according to claim 2 is characterized in that: The pile tip steel (10) is a columnar body with a cross-shaped radial section, and a part of the columnar body is inserted and fixed on the bottom surface of the bearing platform.

4. The assembled concrete high pile foundation for water photovoltaic according to claim 1 is characterized in that: Grouting ports (8) and grouting exhaust ports (9) are symmetrically provided on the top end surfaces of the inclined pile extension section (7) and the vertical pile (5); core-filling concrete is poured into the inner cavity of the inclined pile extension section (7) and the inner cavity on the top side of the vertical pile (5); the strength grade of the core-filling concrete is consistent with the strength grade of the cap concrete, and an expansion agent is added therein to cause the concrete to expand in volume by 0.05% to 0.2% during solidification.

5. The assembled concrete high pile foundation for water photovoltaic according to claim 1 is characterized in that: Pile holes (13) penetrating the cap are provided at four connection positions on the bottom surface of the cap for connecting the oblique foundation piles (4) and the vertical foundation piles (5), and an internal steel section (14) is horizontally arranged in each pile hole (13) so that the top ends of the oblique foundation piles (4) and the vertical foundation piles (5) inserted in the pile holes (13) abut against the bottom surface of the internal steel section (14); a closed annular support plate (17) is sleeved on the outer side of each oblique foundation pile (4) and the vertical foundation pile (5), and the top surface of the closed annular support plate (17) is fixed on the bottom surface of the cap.

6. The assembled concrete high pile foundation for water photovoltaic according to claim 1, characterized in that: The built-in steel sections (14) are arranged in a cross shape or a tic-tac-toe shape in the pile hole.

7. The assembled concrete high pile foundation for water photovoltaic according to claim 1, characterized in that: A plurality of reinforcing ribs (15) are evenly distributed along the circumferential direction on the top outer walls of each oblique foundation pile (4) and each vertical foundation pile (5), and the top surface of each reinforcing rib (15) is fixed on the bottom surface of the closed annular support plate (17).

8. The assembled concrete high pile foundation for water photovoltaic according to claim 1, characterized in that: Core-filling concrete is poured into each pile hole (13); the strength grade of the core-filling concrete is adapted to the strength grade of the cap concrete, and an expansion agent is added therein to cause the concrete to expand in volume by 0.05% to 0.2% during solidification.

9. The assembled concrete high pile foundation for water photovoltaic according to claim 1, characterized in that: The photovoltaic grid support (2) comprises a support tube, four support steel sections (11) and a connection node (12) arranged in sequence from top to bottom; the support tube is arranged vertically, and its bottom end is fixed at the center of the top surface of the support platform; the bottom ends of the four support steel sections (11) are fixed on the top surface of the support tube along the circumferential direction, and the top ends of the four are fixed on the steel connection node (12) located directly above the support tube; the connection node (12) is a spherical body, which is used to be fixed to the connection node on the photovoltaic grid (1).

10. A construction method for the assembled concrete high pile foundation for water photovoltaic as claimed in any one of claims 1 to 9, characterized in that: Here are the steps: S1. In the factory, the cap, the oblique foundation piles (4) and the vertical foundation piles (5) are manufactured and transported to the construction site; S2. Using special ship equipment, complete the installation of the oblique foundation piles (4) and the vertical pipe piles (5), and connect and fix the cap to the top side of the corresponding oblique foundation piles (4) and the vertical pipe piles (5); S3, tie the steel bars and grout the plug-in connection between the cap and the foundation pile; S4, installing the photovoltaic grid support (2) and the above-water photovoltaic grid (1) on the high pile foundation (3) in sequence.

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