A variable cross-section prestressed concrete pile

Abstract

The utility model relates to the technical field of concrete piles, specifically to a variable-section prestressed concrete pile, comprising an upper tube, wherein the bottom of the upper tube is fixed to the upper end of a middle tube, the lower end of the middle tube is fixed to the upper end of a lower tube, an anti-corrosion protective layer is installed at the lower end of the lower tube, through holes are arranged in the middle of the upper tube, the middle tube and the lower tube, the extension direction of the through holes is parallel to the extension direction of the upper tube, the middle tube and the lower tube, prestressed main reinforcement is arranged between the inner wall of the through hole and the outer walls of the upper tube, the middle tube and the lower tube, the connection points of the prestressed main reinforcement and the spiral reinforcement are welded and fixed point by point, the spiral reinforcement is spirally wrapped around the inner wall of the through hole and the outer walls of the upper tube, the middle tube and the lower tube, the improved concrete pile can withstand greater pressure at the bottom, thereby improving its bearing capacity, the upper tube is narrow at the top and wide at the bottom design is more in line with the stress condition of the upper tube during use, plays a role in extending the overall service life of the concrete pile, and the design concept is more scientific.

Description

Technical Field

[0001] The utility model relates to the technical field of concrete piles, in particular to a variable-section prestressed concrete pile. Background Art

[0002] Concrete piles are piles made of concrete, including ordinary reinforced concrete and prestressed concrete. Concrete piles can be divided into two categories according to the construction method: precast piles and cast-in-place piles. Precast piles can directly bear vertical loads, but no matter what construction method is used, it is necessary to ensure that the pile tip is in close contact with the pile foundation plane so that the pile tip enters the soil vertically to avoid the concrete pile from tilting or breaking. When the concrete pile is loaded, it is located above the ground. Due to the action of gravity, the load at the bottom of the concrete pile is greater than the top of the concrete pile. For the concrete piles located below the ground, due to the friction on the side of the concrete pile, the load of the concrete pile decreases as the horizontal plane decreases. At present, many concrete piles adopt a uniform cross-section design, and the utilization of friction is low.

[0003] In the process of realizing the utility model, the inventors found that the prior art had the following problems: 1. For concrete piles located below the ground, due to the friction force on the side of the concrete pile, the load of the concrete pile decreases as the horizontal plane decreases. Currently, many concrete piles adopt a uniform cross-section design, and the utilization rate of friction force is low; 2. For concrete piles located above the ground, due to the effect of gravity, the load at the bottom of the concrete pile is greater than that at the top of the concrete pile. The cross-section design of concrete piles with uniform cross-section design is not very reasonable in real life. Utility Model Content

[0004] The purpose of the utility model is to provide a variable cross-section prestressed concrete pile to solve the problems raised in the above background technology. To achieve the above purpose, the utility model provides the following technical solutions: a variable cross-section prestressed concrete pile, including an upper tube, the bottom of the upper tube is fixed to the upper end of the middle tube, the lower end of the middle tube is fixed to the upper end of the lower tube, the lower end of the lower tube is installed with an anti-corrosion protective layer, the middle of the upper tube, the middle tube, and the lower tube are all provided with through holes, the extension direction of the through holes is parallel to the extension direction of the upper tube, the middle tube, and the lower tube, prestressed main bars are provided between the inner wall of the through hole and the outer wall of the upper tube, the middle tube, and the lower tube, the connection points of the prestressed main bars and the spiral bars are fixed by point welding, the spiral bars are spirally wrapped between the inner wall of the through hole and the outer wall of the upper tube, the middle tube, and the lower tube, and the spiral wrapping radius of the spiral bars inside the upper tube, the middle tube, and the lower tube are all the same.

[0005] Further preferably, the horizontal cross-sections of the upper tube, the middle tube and the lower tube are all circular.

[0006] Further preferably, the circular radius of the horizontal cross-section of the upper end of the lower tube is greater than the circular radius of the horizontal cross-section of the lower end of the lower tube.

[0007] Further preferably, the circular radius of the horizontal cross-section of the upper end of the middle tube is greater than the circular radius of the horizontal cross-section of the lower end of the middle tube.

[0008] Further preferably, the circular radius of the horizontal cross-section of the upper end of the upper tube is smaller than the circular radius of the horizontal cross-section of the lower end of the upper tube.

[0009] Further preferably, the plurality of prestressed main bars are arranged in a surrounding manner, the internal through-hole radii of the upper tube, the middle tube and the lower tube are the same, and the prestressed main bars at the lower end of the lower tube are located inside the anti-corrosion protective layer.

[0010] Compared with the prior art, the utility model has the following beneficial effects:

[0011] In the utility model, the lower pipe adopts a concrete pile design that is wide at the top and narrow at the bottom. In practical use, the bottom of the pile can withstand greater pressure through the combined action of supporting force, lateral pressure and friction force, thereby improving the bearing capacity of the concrete pile.

[0012] In the utility model, the design of the upper tube being narrow at the top and wide at the bottom is more in line with the stress condition of the upper tube during use, which plays a role in extending the overall service life of the concrete pile, and the design concept is also more scientific. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a side view of the structure of the utility model;

[0014] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model;

[0015] Figure 3 It is a schematic diagram of the explosion structure of the utility model.

[0016] In the figure: 1. upper tube; 2. middle tube; 3. lower tube; 4. anti-corrosion protective layer; 5. prestressed main reinforcement; 6. spiral reinforcement; 7. through hole. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technical personnel in this field without creative work are within the scope of protection of the utility model.

[0018] See also Figures 1 to 3The utility model provides a technical solution: a variable-section prestressed concrete pile, comprising an upper tube 1, the bottom of the upper tube 1 is fixed to the upper end of the middle tube 2, the lower end of the middle tube 2 is fixed to the upper end of the lower tube 3, and the lower end of the lower tube 3 is installed with an anti-corrosion protective layer 4, and a through hole 7 is arranged in the middle of the upper tube 1, the middle tube 2, and the lower tube 3, and the extension direction of the through hole 7 is parallel to the extension direction of the upper tube 1, the middle tube 2, and the lower tube 3. A prestressed main reinforcement 5 is arranged between the inner wall of the through hole 7 and the outer wall of the upper tube 1, the middle tube 2, and the lower tube 3, and the connection points of the prestressed main reinforcement 5 and the spiral reinforcement 6 are welded and fixed point by point, and the spiral reinforcement 6 is spirally wrapped between the inner wall of the through hole 7 and the outer wall of the upper tube 1, the middle tube 2, and the lower tube 3, and the spiral wrapping radius of the spiral reinforcement 6 inside the upper tube 1, the middle tube 2, and the lower tube 3 are all the same.

[0019] In this embodiment, Figure 1 As shown, the horizontal cross-sections of the upper tube 1, the middle tube 2, and the lower tube 3 are all circular; the lower tube 3 adopts a concrete pile design that is wide at the top and narrow at the bottom. In practical use, the bottom of the pile can withstand greater pressure through the combined action of supporting force, lateral pressure, and friction. The lateral pressure increases the effect of friction, thereby improving its bearing capacity. When in use, it is necessary to drill a pit of similar shape in the predetermined area, and place the concrete pile therein by a crane to complete the placement of the concrete pile.

[0020] In this embodiment, Figure 1 As shown, the circular radius of the horizontal cross-section at the upper end of the lower tube 3 is larger than the circular radius of the horizontal cross-section at the lower end of the lower tube 3; the lower tube 3 adopts a concrete pile design that is wide at the top and narrow at the bottom. In practical use, the supporting force, lateral pressure, and friction force can work together. The lateral pressure increases the effect of friction, so that the bottom of the pile can withstand greater pressure, thereby improving its bearing capacity. When in use, it is necessary to drill a pit of similar shape in the predetermined area, and place the concrete pile into it by a crane to complete the placement of the concrete pile.

[0021] In this embodiment, Figure 1 As shown, the circular radius of the horizontal cross-section of the upper end of the middle tube 2 is greater than the circular radius of the horizontal cross-section of the lower end of the middle tube 2; the middle tube 2 is located near the ground surface, which can serve to remind the staff of the placement ratio of the concrete piles, and at the same time increase the contact area between the concrete piles and the ground surface to improve the stability of the concrete piles.

[0022] In this embodiment, Figure 1 As shown, the circular radius of the horizontal cross-section at the upper end of the upper tube 1 is smaller than the circular radius of the horizontal cross-section at the lower end of the upper tube 1; the design of the upper tube 1 being narrow at the top and wide at the bottom is more in line with the stress condition of the upper tube 1 during use, which plays a role in extending the overall service life of the concrete pile. When in use, the implementation object is placed on the upper end of the upper tube 1, and the installation and fixation of the implementation object is completed.

[0023] In this embodiment, Figure 2As shown, a plurality of prestressed main bars 5 are arranged in a surrounding manner, and the radius of the internal through holes 7 of the upper tube 1, the middle tube 2, and the lower tube 3 are the same, and the prestressed main bars 5 at the lower end of the lower tube 3 are located inside the anti-corrosion protective layer 4; the prestressed main bars 5 help the concrete pile to improve its bearing capacity and crack resistance. Since the prestressed main bars 5 are made of metal, they are easily corroded after being exposed to the soil for a long time, thereby weakening the bearing capacity of the concrete pile. The anti-corrosion protective layer 4 is located at the bottom of the concrete pile and is responsible for protecting the prestressed main bars 5.

[0024] The use method and advantages of the utility model: The variable cross-section prestressed concrete pile, when in use, has the following working process:

[0025] like Figure 1 , Figure 2 and Figure 3 As shown, first, the lower pipe 3 adopts a concrete pile design with a width on the top and a narrowness on the bottom. In practical use, the bottom of the pile can withstand greater pressure through the combined action of support force, lateral pressure and friction force. The lateral pressure increases the effect of friction, thereby improving its bearing capacity. When in use, it is necessary to drill a pit with a similar shape in the predetermined area, and place the concrete pile into it by a crane, that is, to complete the placement of the concrete pile. The middle pipe 2 is located near the surface, which can serve to remind the staff of the placement ratio of the concrete pile, and at the same time increase the contact area between the concrete pile and the surface to improve the stability of the concrete pile. The design of the upper pipe 1 with a narrow top and a wide bottom is more in line with the stress condition of the upper pipe 1 during use, which plays a role in extending the overall service life of the concrete pile. When in use, the implementation object is placed on the upper end of the upper pipe 1, that is, the installation and fixation of the implementation object is completed. The prestressed main reinforcement 5 helps the concrete pile to improve its bearing capacity and crack resistance. Since the prestressed main reinforcement 5 is made of metal, it is easily corroded after being exposed to the soil for a long time, thereby weakening the bearing capacity of the concrete pile. The anti-corrosion protective layer 4 is located at the bottom of the concrete pile, which is responsible for protecting the prestressed main reinforcement 5.

[0026] The above shows and describes the basic principle, main features and advantages of the utility model. Technical staff in this industry should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model will have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A variable cross-section prestressed concrete pile, comprising an upper tube (1), characterized in that: The bottom of the upper tube (1) is fixed to the upper end of the middle tube (2), the lower end of the middle tube (2) is fixed to the upper end of the lower tube (3), and the lower end of the lower tube (3) is installed with an anti-corrosion protective layer (4). Through holes (7) are arranged in the middle of the upper tube (1), the middle tube (2) and the lower tube (3). The extension direction of the through holes (7) is parallel to the extension direction of the upper tube (1), the middle tube (2) and the lower tube (3). Prestressed main reinforcement (5) is arranged between the inner wall of the through hole (7) and the outer walls of the upper tube (1), the middle tube (2) and the lower tube (3). The connection points of the prestressed main reinforcement (5) and the spiral reinforcement (6) are welded and fixed point by point. The spiral reinforcement (6) is spirally wound between the inner wall of the through hole (7) and the outer walls of the upper tube (1), the middle tube (2) and the lower tube (3). The spiral winding radius of the spiral reinforcement (6) inside the upper tube (1), the middle tube (2) and the lower tube (3) is the same.

2. A variable cross-section prestressed concrete pile according to claim 1, characterized in that: The horizontal cross-sections of the upper tube (1), the middle tube (2) and the lower tube (3) are all circular.

3. The variable cross-section prestressed concrete pile according to claim 1, characterized in that: The circular radius of the horizontal cross section of the upper end of the lower tube (3) is greater than the circular radius of the horizontal cross section of the lower end of the lower tube (3).

4. The variable cross-section prestressed concrete pile according to claim 1, characterized in that: The circular radius of the horizontal cross section of the upper end of the middle tube (2) is greater than the circular radius of the horizontal cross section of the lower end of the middle tube (2).

5. The variable cross-section prestressed concrete pile according to claim 1, characterized in that: The circular radius of the horizontal cross section of the upper end of the upper tube (1) is smaller than the circular radius of the horizontal cross section of the lower end of the upper tube (1).

6. The variable cross-section prestressed concrete pile according to claim 1, characterized in that: The plurality of prestressed main ribs (5) are arranged in a circumferential manner, the internal through holes (7) of the upper tube (1), the middle tube (2) and the lower tube (3) have the same radius, and the prestressed main ribs (5) at the lower end of the lower tube (3) are located inside the anti-corrosion protective layer (4).

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