Heliostat PHC pile foundation

Abstract

The utility model discloses a PHC pile foundation for a heliostat, which is used for fixing and supporting the heliostat, steel bar stretching holes for locking prestressed tendons are uniformly distributed on the annular end surface of an end plate, and the PHC pile foundation further comprises a pile main body, a plugging plate and a plurality of anchor tendons, the plugging plate is used for sealing the top face of the concrete annular wall layer of the pile body. The end plate is fixed and buckled on the top surface of the plugging plate, the end plate is fixed with the top surface of the pile main body, and the inner diameter of the end plate is smaller than the outer diameter of the plugging plate; the two ends of the multiple anchor bars are welded to the bottom face of the end plate and fixed into the concrete annular wall layer correspondingly, the multiple anchor bars are evenly distributed in the circumferential direction of the pile body, and the anchor bars are surrounded by the prestressed bars. The structure of the PHC pile is improved, on one hand, the plugging plate is additionally arranged to prevent rain and snow from entering the PHC pile before the heliostat is installed, and on the other hand, the anchor bars are additionally arranged to prevent position deviation of the prestressed tendons after the prestressed tendons are locked in the steel bar stretching holes. The PHC pile for the heliostat is more suitable for fixing and supporting the heliostat.

Description

Technical Field

[0001] The utility model relates to the field of heliostat foundations, in particular to a heliostat PHC pile foundation. Background Art

[0002] Currently, PHC piles are becoming the preferred type of pile for heliostat foundations in tower solar thermal power plant fields due to their ease of construction and reduced construction time. The PHC pile foundation connects to the heliostats using a flange at the top plate of the pile, which then connects to the upper heliostat transmission equipment. Traditional PHC piles are prestressed using a pre-tensioning method, resulting in high bearing capacity. However, the tensile loads on the pile end plate are more complex due to the daily rotation of the heliostats and the variability of wind loads.

[0003] For example, the Chinese utility model patent application number CN03255810.4, filed on July 18, 2003, and entitled "Bowl-Shaped End of Prestressed High-Strength Concrete Pipe Piles," features interconnected steel rod tensioning holes. After the prestressing tendons are tensioned in the larger holes, they are moved into the smaller holes and locked in place. PHC piles are prone to displacement under the multiple loads of heliostats. Over time, this can cause the prestressing tendons at the pile top to slip along the steel rod tensioning holes, seriously impacting the load-bearing and safety of the heliostat pile foundation.

[0004] To address the above problems, the structure of the existing PHC pile is improved to reduce the risk of the prestressed reinforcement at the pile top slipping along the lock hole. Utility Model Content

[0005] The purpose of the utility model is to provide a PHC pile foundation that is more suitable for supporting a heliostat.

[0006] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0007] A heliostat PHC pile foundation is used to fix and support the heliostat. The annular end surface of the end plate is uniformly distributed with steel rod stretching holes for locking prestressed tendons. The pile also includes a pile body, a blocking plate, and multiple anchor bars.

[0008] The blocking plate is used to seal the top surface of the concrete ring wall layer of the pile body;

[0009] The end plate is fixed and buckled on the top surface of the blocking plate, the end plate and the top surface of the pile body are fixed, and the inner diameter of the end plate is smaller than the outer diameter of the blocking plate;

[0010] Two ends of a plurality of anchor bars are respectively welded to the bottom surface of the end plate and fixed in the concrete ring wall layer. The plurality of anchor bars are evenly distributed along the circumference of the pile body, and the prestressed bars surround the anchor bars.

[0011] Furthermore, the length of the anchor bar is 35 times the diameter of the anchor bar.

[0012] Furthermore, a flange is fixed to the outside of the end plate, and the flange is fixedly connected to the heliostat.

[0013] Furthermore, the top surface of the blocking plate is flush with the bottom surface of the end plate.

[0014] In the above technical solution, the utility model has the following beneficial effects:

[0015] This utility model improves the structure of the PHC pile by adding a blocking plate to prevent rain and snow from entering the pile before heliostat installation, and by adding anchor bars to prevent the prestressed tendons from shifting after being locked in the steel rod tensioning holes. Anchor bars are added at the corresponding positions of the end plates using pressure submerged arc welding. This improves the reliability of the end plates during factory production, strengthens the anchoring of the end plates to the concrete ring wall, and limits their displacement, thereby reducing the risk of the prestressed tendons at the pile top slipping along the locking holes. This new heliostat PHC pile is more suitable for fixed support of heliostats. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0017] Figure 1 This is a schematic diagram of the main structure of the heliostat PHC pile foundation disclosed in the utility model;

[0018] Figure 2 This is a schematic diagram of the top view of the PHC pile foundation of the heliostat disclosed in the utility model.

[0019] Reference numerals:

[0020] Pile body 1, end plate 2, steel rod stretching hole 3, blocking plate 4, anchor bar 5, concrete ring wall layer 41. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0022] It should be noted that the terms "above", "one end", "upper", etc. used in this article indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description. Similar expressions are only for illustrative purposes, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention; in addition, the terms "one part", "two parts", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0023] like Figure 1-2 The heliostat PHC pile foundation shown is used to fix and support the heliostat. Steel rod stretching holes 3 for locking prestressed tendons are uniformly distributed on the annular end surface of the end plate 2. The pile also includes a pile body 1, a blocking plate 4, and multiple anchor bars 5.

[0024] The sealing plate 4 is used to seal the top surface of the concrete ring wall layer 41 of the pile body 1;

[0025] The end plate 2 is fixed and buckled onto the top surface of the blocking plate 4. The inner diameter of the end plate 2 is smaller than the outer diameter of the blocking plate 4. The annular end plate 2 can press against the edge of the blocking plate 4. This facilitates the end plate 2 to seal the pile body. The two are welded together. The end plate 2 is fixed to the top surface of the pile body 1.

[0026] The ends of the multiple anchor bars 5 are respectively welded to the bottom surface of the end plate 2 and fixed in the concrete ring wall layer 41. The multiple anchor bars 5 are evenly distributed along the circumference of the pile body 1, and the prestressed bars surround the anchor bars 5. In other words, all the anchor bars 5 are closer to the center of the pile than the steel rod tensioning holes 3.

[0027] The length of the anchor bar 5 is 35 times the diameter of the anchor bar 5. If the anchor bar 5 is too long, it will waste materials, and if it is too short, it will not play the role of connecting the end plate and the pile body.

[0028] A flange is fixed on the outside of the end plate 2, and the flange is fixedly connected to the heliostat.

[0029] Furthermore, the top surface of the blocking plate 4 is flush with the bottom surface of the end plate 2 and the top surface of the pile body 1 , respectively. Such an end plate structure is simple.

[0030] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A heliostat PHC pile foundation for fixing and supporting a heliostat, wherein steel rod stretching holes (3) for locking prestressed tendons are uniformly distributed on the annular end surface of the end plate (2), and characterized in that: It also includes a pile body (1), a blocking plate (4), and a plurality of anchor bars (5); The sealing plate (4) is used to seal the top surface of the concrete ring wall layer (41) of the pile body (1); The end plate (2) is fixed and buckled on the top surface of the blocking plate (4), the end plate (2) and the top surface of the pile body (1) are fixed, and the inner diameter of the end plate (2) is smaller than the outer diameter of the blocking plate (4); Both ends of the plurality of anchor bars (5) are respectively welded to the bottom surface of the end plate (2) and fixed in the concrete ring wall layer (41); the plurality of anchor bars (5) are evenly distributed along the circumference of the pile body (1), and the prestressed bars surround the anchor bars (5).

2. A heliostat PHC pile foundation according to claim 1, characterized in that: The length of the anchor bar (5) is 35 times the diameter of the anchor bar (5).

3. The heliostat PHC pile foundation according to claim 1, characterized in that: A flange is fixed on the outside of the end plate (2), and the flange is fixedly connected to the heliostat.

4. The heliostat PHC pile foundation according to claim 1, characterized in that: The top surface of the blocking plate (4) is flush with the bottom surface of the end plate (2).

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