Prestressed concrete square pile with annular end plates

Abstract

The prestressed concrete square pile with the annular end plates comprises pile bodies and the annular end plates located at the two ends of the pile bodies, and every two adjacent pile bodies are fixedly connected through the corresponding annular end plate. A plurality of vertical through holes are annularly formed in the end face of the annular end plate, the vertical through holes comprise large holes and small holes which are communicated with each other, and the end faces where the small holes are located abut against the end face of the pile body and are used for anchoring pier heads of prestressed main reinforcements; and an internal thread is annularly arranged on the inner wall of the large hole and is used for connecting a tensioning bolt. According to the prestressed concrete square pile, due to the arrangement of the annular end plates, the rigidity of the end plates is large, the steel consumption is reduced, and out-of-plane bending deformation caused by the limited thickness when a common end plate is tensioned is avoided. In addition, due to the arrangement of the annular end plates, welding pile splicing can be adopted, pin type mechanical connection and welding composite pile splicing can also be adopted, the connecting effect is visible to naked eyes, inspection is facilitated, and the pile splicing reliability is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of precast concrete piles, in particular to a prestressed concrete square pile with an annular end plate. Background Art

[0002] At present, the pile head end plates of prestressed concrete square piles are all sheet-shaped end plates with a thickness of about 20 mm. Large and small holes are opened on the end plates corresponding to the positions of the prestressed main reinforcement of the pile body. The large holes are tensioning holes, which are used to insert the pier heads of the prestressed main reinforcement and embed the prestressed main reinforcement into the small holes and connect the tensioning anchor bolts. The small holes are swaged holes, which are used to anchor the pier heads of the prestressed main reinforcement. The large and small holes are connected in a gourd shape.

[0003] Due to the limited thickness of the end plates and their low out-of-plane stiffness, the end plates are prone to out-of-plane bending or inward deformation during production tensioning and when the pullout pile body is subjected to high tensile forces. This also requires a large amount of steel, especially for square pile end plates, resulting in high costs. Furthermore, when welding piles, the weld width is limited at the outer edge of the thinner end plates, affecting the strength of the weld connection. Utility Model Content

[0004] The purpose of the present utility model is to provide a prestressed concrete square pile with an annular end plate, which can solve one or more of the above-mentioned problems in the prior art.

[0005] A prestressed concrete square pile with annular end plates comprises: a pile body and annular end plates located at both ends of the pile body, wherein two adjacent pile bodies are fixedly connected by the annular end plates; a plurality of vertical through holes are arranged on the end faces of the annular end plates, wherein the vertical through holes include large holes and small holes that are interconnected, and the end faces of the small holes are in contact with the end faces of the pile body for anchoring the pier heads of the prestressed main reinforcement bars; an internal thread is arranged on the inner wall of the large hole for connecting tensioning bolts.

[0006] In some embodiments, the vertical through hole is stepped, and the inner diameter of the large hole is larger than the outer diameter of the pier head, and the inner diameter of the small hole is smaller than the outer diameter of the pier head, so that the pier head is inserted from the large hole and anchored at the small hole.

[0007] In some embodiments, a stepped surface is formed between the large hole and the small hole, and the shape of the stepped surface is adapted to the pier head to prevent the prestressed main reinforcement from shaking during the tensioning process.

[0008] In some embodiments, the annular end plate is square.

[0009] In some embodiments, the annular end plate further has a plurality of openings, which are formed transversely between the vertical through hole and the outer wall of the annular end plate and are used to transversely insert the prestressed main reinforcement into the vertical through hole.

[0010] In some embodiments, the spacing between the openings is equal to the inner diameter of the pore.

[0011] In some embodiments, an end surface of the annular end plate is slightly smaller than an end surface of the pile body.

[0012] In some embodiments, the annular end plate has a thickness of 40-50 mm.

[0013] In some embodiments, a plurality of pin holes are provided on the outer wall of the annular end plate, and two adjacent annular end plates are fixedly connected by a connecting plate and pins.

[0014] In some embodiments, the gap between two adjacent annular end plates is fixedly connected by welding.

[0015] The beneficial effects of the present invention are as follows: the prestressed concrete square piles of the present invention have a larger stiffness and a reduced steel consumption through the arrangement of annular end plates, thereby avoiding out-of-plane bending deformation caused by limited thickness when ordinary end plates are tensioned; in addition, the arrangement of annular end plates allows for not only welded pile connections but also composite pile connections using pin-type mechanical connections and welding, the connection effect being visible to the naked eye and convenient for inspection, thereby greatly improving the reliability of the pile connections. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural diagram of a prestressed concrete square pile with annular end plates in the utility model;

[0017] Figure 2 yes Figure 1 Schematic diagram of the splicing structure of prestressed concrete square piles shown;

[0018] Figure 3 、 4 yes Figure 2 Schematic diagram of the internal structure of the spliced ​​structure shown;

[0019] Figure 5 yes Figure 1 A schematic structural diagram of the annular end plate shown;

[0020] Figure 6 yes Figure 5 a bottom view of the annular end plate shown;

[0021] Figure 7 yes Figure 5 Schematic diagram of the internal structure of the annular end plate shown;

[0022] Numbers in the figure: 1, pile body; 2, annular end plate; 21, vertical through hole; 211, large hole; 212, small hole; 213, step surface; 22, opening; 3, connecting plate; 4, pin. DETAILED DESCRIPTION

[0023] In order to help those skilled in the art better understand the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0024] Combine Figure 1 、 2 As shown, this embodiment provides a prestressed concrete square pile with annular end plates, comprising: a pile body 1 and annular end plates 2 located at both ends of the pile body 1, and two adjacent pile bodies 1 are fixedly connected by the annular end plates 2. Specifically, the pile body 1 can be a prestressed concrete solid square pile or a prestressed concrete hollow square pile, comprising a pile body and a steel cage located inside the pile body, the steel cage comprising axially arranged prestressed main bars and stirrups wound around the prestressed main bars, pier heads are formed at both ends of the prestressed main bars, and during the production and processing, the prestressed main bars are tensioned by tensioning the pier heads. Combined with Figure 5-7 As shown, the annular end plate 2 is square and 40-50mm thick, with its end face slightly smaller than the end face of the pile body 1. This design makes the annular end plate 2 more rigid and uses less steel than conventional end plates, thus avoiding the out-of-plane bending deformation that occurs when conventional end plates are stretched due to their limited thickness. Furthermore, when connecting piles, since the joint between two adjacent annular end plates 2 is recessed inward relative to the pile body 1, this recess can be filled and sealed with materials such as fine stone concrete or epoxy resin 003 to prevent exposure of the iron parts and improve the corrosion resistance of the joint.

[0025] Furthermore, the end face of the annular end plate 2 of the present application is provided with a number of vertical through holes 21 according to the position of the prestressed main reinforcement of the pile body 1. The vertical through holes 21 are stepped, with different inner diameters at the upper and lower ends. The larger inner diameter is the large hole 211, and the smaller inner diameter is the small hole 212. A step surface 213 is formed between the large hole 211 and the small hole 212. The end face of the small hole 212 abuts the end face of the pile body 1 and is used to anchor the pier head of the prestressed main reinforcement. The inner wall of the large hole 211 is provided with an internal thread for connecting to the tensioning bolt hole to achieve tensioning of the prestressed main reinforcement during the production process. Specifically, the inner diameter of the large hole 211 is larger than the outer diameter of the pier head, and the inner diameter of the small hole 212 is smaller than the outer diameter of the pier head, so that the pier head is inserted through the large hole 211 and anchored at the small hole 212. The shape of the step surface 213 is adapted to the pier head, which can prevent the prestressed main reinforcement from shaking during tensioning. The outer wall of the annular end plate 2 is vertically provided with a plurality of openings 22 , which are formed transversely between the vertical through hole 21 and the outer wall of the annular end plate 22 , and the spacing between the openings 22 is equal to the inner diameter of the small hole 212 , so as to facilitate the transverse insertion of the prestressed main reinforcement into the vertical through hole 21 .

[0026] Further, combined Figure 3 、 4 As shown, the outer wall of the annular end plate 2 is provided with a plurality of pin holes, and two adjacent annular end plates 2 can be fixedly connected by a connecting plate 3 and a pin 4. The gap between the two adjacent annular end plates 2 can be fixedly connected by welding.

[0027] When connecting piles, align the annular end plates of the upper and lower pile bodies, and first mechanically connect the annular end plates 2 through the connecting plates 3 and pins 4; then fully weld the four sides of the annular end plates 2 to achieve a composite connection of mechanical and welding; and then fill and seal the recessed areas of the annular end plates 2 with fine stone concrete or epoxy resin 003 to avoid exposure of iron parts and improve the corrosion resistance of the joints.

[0028] In summary, the precast concrete square piles of the present invention have the following advantages:

[0029] 1. The annular end plate uses slightly less steel than conventional end plates and has greater rigidity, thus avoiding the out-of-plane bending deformation that occurs when conventional end plates are tensioned due to their limited thickness. Compared to the tensioning sleeves used in prestressed square piles without end plates, the annular end plate creates a more uniform and reasonable prestress on the pile head concrete and facilitates welding of the piles.

[0030] 2. The annular end plate can be used for pile connection by welding, or by a composite connection of pin-type mechanical connection and welding. The connection is visible to the naked eye and is easy to inspect, which greatly improves the reliability of the pile connection. The concave part of the joint can be filled and sealed with fine stone concrete or epoxy resin to avoid exposure of iron parts and improve the corrosion resistance of the joint.

[0031] 3. The prestressed square piles with annular end plates are used to connect with the cap. The end plate tensioning holes can be directly screwed into the cap anchor bars (non-prestressed threaded steel bars) after upsetting, which can greatly improve the construction efficiency of the connection between the pile top and the cap.

[0032] The above descriptions are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A prestressed concrete square pile with annular end plates, characterized in that: include: A pile body (1) and annular end plates (2) located at both ends of the pile body (1), wherein two adjacent pile bodies (1) are fixedly connected via the annular end plates (2); a plurality of vertical through holes (21) are provided on the end face of the annular end plate (2); the vertical through holes (21) include large holes (211) and small holes (212) that are interconnected; the end face of the small hole (212) abuts against the end face of the pile body (1) and is used for anchoring the pier head of the prestressed main reinforcement; an inner thread is provided on the inner wall of the large hole (211) for connecting a tensioning bolt.

2. The prestressed concrete square pile according to claim 1, characterized in that: The vertical through hole (21) is stepped, and the inner diameter of the large hole (211) is larger than the outer diameter of the pier head, and the inner diameter of the small hole (212) is smaller than the outer diameter of the pier head, so that the pier head is inserted from the large hole (211) and then anchored at the small hole (212).

3. The prestressed concrete square pile according to claim 1 or 2, characterized in that: A stepped surface (213) is formed between the large hole (211) and the small hole (212), and the shape of the stepped surface (213) is adapted to the pier head, thereby preventing the prestressed main reinforcement from shaking during the tensioning process.

4. The prestressed concrete square pile according to claim 1, characterized in that: The annular end plate (2) is square.

5. The prestressed concrete square pile according to claim 1, characterized in that: The annular end plate (2) further has a plurality of openings (22), which are formed transversely between the vertical through hole (21) and the outer wall of the annular end plate (2) and are used for transversely inserting the prestressed main reinforcement into the vertical through hole (21).

6. The prestressed concrete square pile according to claim 5, characterized in that: The spacing between the openings (22) is equal to the inner diameter of the small hole (212).

7. The prestressed concrete square pile according to claim 1, characterized in that: The end surface of the annular end plate (2) is slightly smaller than the end surface of the pile body (1).

8. The prestressed concrete square pile according to claim 1, characterized in that: The thickness of the annular end plate (2) is 40-50 mm.

9. The prestressed concrete square pile according to claim 1, characterized in that: The outer wall of the annular end plate (2) is provided with a plurality of pin holes, and two adjacent annular end plates (2) are fixedly connected via a connecting plate (3) and a pin (4).

10. The prestressed concrete square pile according to claim 1 or 9, characterized in that: The gap between two adjacent annular end plates (2) is fixedly connected by welding.

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