Prestressed concrete precast pile

Abstract

The utility model discloses a prestressed concrete precast pile, and particularly relates to the technical field of concrete precast piles, the prestressed concrete precast pile comprises a pile body, a pile head is installed at the bottom end of the pile body, the pile head is of a conical structure, an expanding and supporting assembly is installed in the pile head, an inner core is connected in the pile body in a screwed mode, the bottom end of the inner core is connected to the expanding and supporting assembly in a pressed mode, and the expanding and supporting assembly is connected with the pile body in a screwed mode. A plurality of main steel bars are vertically arranged in the pile body and are annularly arranged, stirrups are evenly bundled on the outer sides of the annularly arranged main steel bars, an inner cavity is formed in the pile head, a plurality of telescopic openings are formed in the pile head and are annularly arranged, and the expanding and supporting assembly is installed in the inner cavity. And each telescopic opening is communicated with the inner cavity. The utility model has the advantages that the accuracy of the pre-buried depth of the precast pile can be improved, and the compressive strength is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of precast concrete piles, and more specifically, to a prestressed concrete precast pile. Background Art

[0002] Concrete pipe piles play a vital role in the existing building construction process. They are mainly used to drive concrete pipe piles into the foundation before the construction of the main building to increase the strength of the foundation and thus increase the bearing capacity of the foundation. By driving concrete piles into the foundation, it can be ensured that the building is not prone to sinking when the weight and height of the building increase; among them, prestressed precast concrete pipe piles are the most widely used in existing building construction. Prestressed precast concrete pipe piles are a hollow cylindrical slender concrete precast component made by pre-tensioning prestressing technology and centrifugal forming method. Due to its higher strength and small pile resistance, it is becoming more and more popular.

[0003] The utility model patent with patent announcement number CN215801592U discloses a prefabricated prestressed concrete hollow square pile, comprising a pile body and a pile tip. The pile body and the pile tip are integrally arranged, and the pile tip is a prism shape. A pile tip steel bar is arranged in the pile tip. Each set of pile tip steel bars includes an inclined section and a vertical section. An upper top plate and a lower top plate are respectively provided at both ends of the pile body, and the cross-sections of the upper top plate and the lower top plate are of an outer square inner circle structure. The pile body is cast by concrete, and the central part of the pile body is a cylindrical barrel. The centers of the cylindrical barrel and the upper top plate and the lower top plate are on the same vertical line. Several main steel bars are fixedly installed outside the cylindrical barrel between the upper top plate and the lower top plate, and several stirrup sleeves are mounted on the main steel bars. The pile body is in the form of an outer square inner circle, and a steel bar layer is spirally welded on the cylindrical barrel, and the steel bar layer is any one of threaded steel bars, wire or steel strand. This prefabricated prestressed concrete hollow square pile has a simple structure, novel design and high practical value.

[0004] However, when this structure is actually used, the soil at the bottom becomes increasingly compacted during the installation process of the precast pile. A slope is provided at the bottom of the precast pile. After the pile is lowered to a specified depth, the compacted soil will produce a certain pressure rebound on the slope, resulting in the pile depth being shallower than the expected depth after the precast pile is installed. At the same time, due to the hollow structure, there is a risk of fracturing under long-term irregular soil compression. Therefore, a prestressed concrete precast pile is proposed. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a prestressed concrete precast pile to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a prestressed concrete precast pile, comprising a pile body, a pile head installed at the bottom end of the pile body, the pile head having a conical structure, an expansion and support assembly installed in the pile head, an inner core screwed into the interior of the pile body, and the bottom end of the inner core pressed onto the expansion and support assembly.

[0007] Preferably, a plurality of main steel bars are arranged vertically in the pile body, the plurality of main steel bars are arranged in a ring shape, and stirrups are evenly bundled on the outside of the main steel bars arranged in a ring shape.

[0008] Preferably, an inner cavity is opened inside the pile head, and a plurality of telescopic openings are opened on the pile head, and the plurality of telescopic openings are arranged in a ring shape, and the expansion support assembly is installed in the inner cavity, and each telescopic opening is communicated with the inner cavity.

[0009] Preferably, the outer portion of the inner core is provided with a thread, and the top end of the inner core is provided with a locking groove.

[0010] Preferably, the expansion support assembly includes a fixed plate, a top rod, a spring, a bottom rod, a fixing frame and a support rod. A top rod is installed on the top of the fixed plate, a spring is sleeved on the top rod, a bottom rod is provided at the bottom end of the fixed plate, a fixing frame is welded on the bottom rod, and a support rod is hinged on the fixing frame.

[0011] Preferably, a plurality of fixing frames are provided, and the hinged support rods on each fixing frame respectively cooperate with the corresponding telescopic openings.

[0012] Technical effects and advantages of this utility model:

[0013] 1. When the pile is lowered, the pile head is pressed down, so that the bottom of the expansion component is stressed and retracted, thereby causing the entire expansion component to retract into the interior of the pile head, and automatically sealing the various expansion openings on the pile head. After the pile body is lowered to the specified depth, the inner core is installed, so that the inner core is rotated downward in the pile body, and the top of the expansion component is pressed down, so that the bottom of the expansion component is expanded and extended from the pile head, thereby inserting into the surrounding soil, thereby improving the reliability of the prefabricated pile position, thereby avoiding the floating phenomenon of the prefabricated pile and improving the accuracy of the pile position. The inner core fills the interior of the pile body, which not only makes it easier to trigger the expansion of the expansion component, but also can change the prefabricated pile from hollow to solid, thereby improving the compressive strength and avoiding the occurrence of fracturing due to long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0015] Figure 2 This is a schematic diagram of the internal structure of the pile body of the present utility model.

[0016] Figure 3This is a schematic diagram of the internal structure of the pile head of the present utility model.

[0017] Figure 4 It is a structural schematic diagram of the expansion component of the utility model.

[0018] The accompanying drawings are marked as follows: 1. Pile body; 2. Pile head; 3. Expansion support assembly; 301. Fixed plate; 302. Top rod; 303. Spring; 304. Bottom rod; 305. Fixed frame; 306. Support rod; 4. Inner core; 5. Hoop reinforcement; 6. Main reinforcement; 7. Inner cavity; 8. Telescopic opening. DETAILED DESCRIPTION

[0019] 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 are within the scope of protection of the present invention.

[0020] As attached Figure 1-4 The prestressed concrete precast pile shown includes a pile body 1, a pile head 2 is installed at the bottom end of the pile body 1, the pile head 2 has a conical structure, an expansion and support component 3 is installed in the pile head 2, an inner core 4 is screwed inside the pile body 1, and the bottom end of the inner core 4 is pressed onto the expansion and support component 3.

[0021] During specific implementation, when the pile is lowered, the pile head 2 is pressed down, so that the bottom of the expansion component 3 is stressed and retracted, thereby causing the entire expansion component 3 to retract into the interior of the pile head 2, and automatically sealing the various telescopic openings 8 on the pile head 2. After the pile body 1 is lowered to the specified depth, the inner core 4 is installed, so that the inner core 4 is rotated downward in the pile body 1, and the top of the expansion component 3 is pressed down, so that the bottom of the expansion component 3 is expanded and extended from the pile head 2, thereby inserting into the surrounding soil, thereby improving the reliability of the prefabricated pile position, thereby avoiding the prefabricated pile from floating up, and improving the accuracy of the pile position. The inner core 4 fills the inside of the pile body 1, which not only facilitates the triggering of the expansion component 3 to expand, but also can change the prefabricated pile from hollow to solid, thereby improving the compressive strength and avoiding the situation of fracturing caused by long-term use.

[0022] A plurality of main steel bars 6 are arranged vertically in the pile body 1 . The plurality of main steel bars 6 are arranged in a ring shape, and stirrups 5 are evenly bundled on the outside of the ring-shaped main steel bars 6 to improve the compressive strength of the pile body 1 .

[0023] An inner cavity 7 is provided inside the pile head 2, and a plurality of telescopic openings 8 are provided on the pile head 2. The plurality of telescopic openings 8 are arranged in a ring shape, and the expansion component 3 is installed in the inner cavity 7. Each telescopic opening 8 is connected to the inner cavity 7 so that the expansion component 3 has an up and down space inside the pile head 2, thereby facilitating the expansion end of the expansion component 3 to extend and retract from each telescopic opening 8.

[0024] The inner core 4 is provided with a thread on the outside and a locking groove on the top of the inner core 4 so that the inner core 4 can be screwed together with the inner wall of the pile body 1. By applying a tightening force from the locking groove, the position of the inner core 4 in the pile body 1 can be adjusted.

[0025] The expansion assembly 3 includes a fixed plate 301, a top rod 302, a spring 303, a bottom rod 304, a fixing frame 305 and a support rod 306. The top rod 302 is installed on the top of the fixed plate 301, and the spring 303 is sleeved on the top rod 302. The bottom end of the fixed plate 301 is provided with a bottom rod 304, and the fixing frame 305 is welded on the bottom rod 304. The support rod 306 is hinged on the fixing frame 305.

[0026] There are multiple fixing frames 305 , and the hinged support rods 306 on each fixing frame 305 are respectively matched with the corresponding telescopic openings 8 .

[0027] During specific implementation, when the pile head 2 is pressed down, the bottom rod 304 is subjected to ground pressure, which compresses the spring 303, causing the fixed plate 301 to rise, and the top rod 302 to be inserted into the bottom end of the pile body 1. The various support rods 306 are retracted in the inner cavity 7 under the connection of the fixing frame 305. When the pile body 1 is completed and the inner core 4 is installed, the inner core 4 presses down the top rod 302, so that the bottom rod 304 extends from the pile head 2 and is inserted into the soil, thereby increasing the depth of the pile. At the same time, the various support rods 306 are swung out from the corresponding telescopic opening 8 and inserted into the surrounding soil, thereby preventing the pile body 1 from rising and improving the accuracy of the depth of the pile body 1.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A prestressed concrete precast pile, comprising a pile body (1), characterized in that: A pile head (2) is installed at the bottom end of the pile body (1), the pile head (2) is in a conical structure, an expansion and support assembly (3) is installed inside the pile head (2), an inner core (4) is screwed inside the pile body (1), and the bottom end of the inner core (4) is pressed onto the expansion and support assembly (3).

2. The prestressed concrete precast pile according to claim 1, characterized in that: A plurality of main steel bars (6) are arranged vertically in the pile body (1), the plurality of main steel bars (6) are arranged in a ring shape, and stirrups (5) are evenly bundled outside the main steel bars (6) arranged in a ring shape.

3. The prestressed concrete precast pile according to claim 2, characterized in that: An inner cavity (7) is provided inside the pile head (2), and a plurality of telescopic openings (8) are provided on the pile head (2). The plurality of telescopic openings (8) are arranged in a ring shape, and the expansion and support assembly (3) is installed in the inner cavity (7), and each telescopic opening (8) is communicated with the inner cavity (7).

4. The prestressed concrete precast pile according to claim 3, characterized in that: The inner core (4) is provided with a thread on the outside, and a locking groove is provided on the top of the inner core (4).

5. The prestressed concrete precast pile according to claim 4, characterized in that: The expansion and support assembly (3) comprises a fixed disk (301), a top rod (302), a spring (303), a bottom rod (304), a fixed frame (305) and a support rod (306); the top of the fixed disk (301) is provided with a top rod (302); the top of the top rod (302) is sleeved with a spring (303); the bottom of the fixed disk (301) is provided with a bottom rod (304); the bottom rod (304) is welded with a fixed frame (305); and the fixed frame (305) is hinged with a support rod (306).

6. The prestressed concrete precast pile according to claim 5, characterized in that: There are multiple fixing frames (305), and the hinged support rods (306) on each fixing frame (305) respectively cooperate with the corresponding telescopic opening (8).

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