A pre-filled core precast pile

Abstract

This utility model provides a precast pile with pre-filled core, belonging to the technical field of concrete components in building construction. It includes: a precast pile body with an inner hole, and an annular thickened layer at one end near its top surface, the thickened layer protruding from the inner hole wall towards the central axis of the inner hole; an end plate disposed on the top surface of the precast pile body, the end plate having at least two connectors, each connector surrounding the inner hole, the lower segment of the connector connected to a pre-filled core anchoring bar embedded in the thickened layer, and the upper segment of the connector having an outer connection portion. The beneficial effects of this utility model are: the thickened layer formed on the inner wall of the precast pile body by thickening towards the center replaces the filling concrete, achieving the effect of one-time factory production, eliminating the on-site filling construction step, and saving construction time.

Description

Technical Field

[0001] This utility model belongs to the technical field of concrete components in building engineering, and relates to a pre-filled core precast pile. Background Technology

[0002] In the field of building foundation engineering, precast concrete piles (including prestressed concrete pipe piles, square piles, etc.) are widely used in the foundation structures of various building projects, bridge projects and port projects due to their significant advantages such as stable quality, fast construction speed and high bearing capacity brought about by factory production.

[0003] The top area of ​​a precast pile is usually the part of the pile that bears the greatest stress. For pull-out piles, in order to meet performance requirements, it is necessary to fill the pile hole with reinforcing bars to improve the connection performance between the pile and the pile cap.

[0004] Because on-site core filling operations cannot meet the standard construction process requirements such as thoroughly cleaning the laitance inside the pipe cavity, applying pure cement slurry, fully filling the core with concrete, compacting it, and ensuring no leakage at the support plate, the on-site core filling operation is complex and the construction quality is difficult to guarantee. In addition, on-site core filling will take up part of the construction period, so there is room for improvement. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a pre-filled core precast pile.

[0006] The objective of this utility model can be achieved through the following technical solution: a pre-filled core precast pile, comprising:

[0007] The precast pile body has an inner hole and at least one end of the precast pile body has an annular thickened layer, which is formed by the inner hole wall protruding towards the central axis of the inner hole.

[0008] An end plate is provided on the end face of the precast pile body corresponding to the end with the thickened layer. The end plate is provided with at least two connecting holes, and each connecting hole is arranged around the central axis of the inner hole.

[0009] A connector, the outer surface of which is provided with an external part that connects to the connection hole, and the lower section of the connector is connected to a core-filling anchoring steel bar embedded in the thickened layer.

[0010] Preferably, the top of the connector is lower than or flush with the top of the end plate, and the bottom of the connector protrudes from the inner side of the end plate; the upper section of the connector is connected to a first bearing anchoring steel bar.

[0011] Preferably, the connector is provided with a first mounting hole, the upper end of the core-filling anchoring steel bar is installed at the lower end of the first mounting hole, and the first pier anchoring steel bar is installed at the upper end of the first mounting hole.

[0012] Preferably, the first mounting hole includes a first threaded segment and a second threaded segment, the upper end of the core-filling anchoring steel bar is threadedly connected to the first threaded segment, the lower end of the first pier anchoring steel bar is threadedly connected to the second threaded segment, and the thread direction of the first threaded segment is the same as or opposite to the thread direction of the second threaded segment.

[0013] Preferably, there is a non-threaded isolation section between the first threaded section and the second threaded section, and the isolation section is located in the middle of the first mounting hole.

[0014] Preferably, the external part of the connector is configured as an external thread section, the connecting hole is configured as a threaded hole structure, and the connector is threadedly connected to the connecting hole through the external thread section.

[0015] Preferably, the end plate is also connected to a main reinforcement bar and a second foundation anchoring reinforcement bar. The main reinforcement bar is embedded in the precast pile body and one end of it is connected to the end plate. The second foundation anchoring reinforcement bar is connected to the end plate.

[0016] Preferably, at least one end plate anchoring steel bar is provided on the inner side of the end plate, and the distance from the end plate anchoring steel bar to the central axis of the inner hole is greater than the distance from the main reinforcement bar to the central axis of the inner hole.

[0017] And / or, the length of the end plate anchoring reinforcement is less than or equal to the length of the core-filling anchoring reinforcement.

[0018] Preferably, the top of the thickened layer extends to the top surface of the precast pile body, and the top surface of the thickened layer is flush with the top surface of the precast pile body.

[0019] Preferably, the end plate is coaxially arranged with the precast pile body, the end plate is configured as a flange structure, and the circumferential width of the end plate is less than or equal to the sum of the wall thickness of the precast pile body and the wall thickness of the thickened layer.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] 1. The precast pile body is reinforced with core-filling anchor steel bars in the thickened layer to replace the core-filling reinforced concrete, achieving the effect of factory-produced precast piles and core filling in one go, eliminating the construction step of core filling on the construction site and saving construction time.

[0022] 2. Because the precast pile body has an inner hole, and the top of the inner hole is not sealed by the concrete core structure, the mud or cement slurry in the pile hole can freely overflow during the pile driving process, significantly reducing the soil pressure on the borehole sidewall and achieving non-displacement pile driving. Moreover, when using the implanted pile construction method, if the top pile is a precast pile with a pre-filled core, the mud or cement slurry left in the pile hole will harden and naturally form the bottom formwork of the foundation concrete, preventing concrete from leaking into the pile hole and causing local defects.

[0023] 3. The purpose of setting up a non-threaded isolation section is to separate the first threaded section and the second threaded section. The end of the filler anchoring rebar cannot be screwed in further after reaching the end of the first threaded section, thus providing an installation limit. Similarly, the end of the first foundation anchoring rebar cannot be screwed in further after reaching the end of the second threaded section. This design eliminates the problems of over-tightening or incomplete installation, ensuring that the installation depth of each rebar is completely consistent, maximizing its anchorage length and effective thread engagement length, thereby guaranteeing that the connection strength meets the design expectations.

[0024] 4. The thread direction of the external thread section is the same as that of the first thread section. When the core anchoring steel bar is screwed in, the external thread section of the connector can be directly screwed into the connecting hole in the same direction. When the first foundation anchoring steel bar is screwed into the second thread section in the opposite direction, the rotation direction of the external thread section of the connector is the tightening direction, so as to avoid affecting the tightness between the connector and the connecting hole when the first foundation anchoring steel bar section is screwed in. Attached Figure Description

[0025] Figure 1 This is a cross-sectional view of the pre-filled core precast pile of this utility model.

[0026] Figure 2 This is a schematic diagram showing the connection relationship between the precast pile body, end plate, and core-filling anchoring steel bars of this utility model.

[0027] Figure 3 This is a schematic diagram showing the connection relationship between the core-filling anchoring steel bars, the pile cap anchoring steel bars, and the precast pile body of this utility model.

[0028] Figure 4 This is a schematic diagram of the end plate of this utility model.

[0029] Figure 5 This is a schematic diagram of the connector of this utility model.

[0030] Figure 6 This is a front view of the end plate of this utility model.

[0031] Figure 7 This is a schematic diagram of the mounting hole structure of this utility model.

[0032] Figure 8 for Figure 7A schematic diagram of the AA cross-section.

[0033] Figure 9 for Figure 7 A schematic diagram of the BB cross-section.

[0034] Figure 10 This is a schematic diagram of an existing precast pile.

[0035] In the diagram, 100 is the precast pile body; 110 is the inner hole; 120 is the thickened layer; 200 is the end plate; 210 is the connecting hole; 220 is the mounting hole; 221 is the pier head hole; 222 is the connecting hole; 310 is the core-filling anchoring reinforcement; 320 is the first pier cap anchoring reinforcement; 400 is the connector; 410 is the first mounting hole; 411 is the first threaded section; 412 is the second threaded section; 413 is the external threaded section; 500 is the end plate anchoring reinforcement; 600 is the main reinforcement; 610 is the pier head; and 700 is the second pier cap anchoring reinforcement. Detailed Implementation

[0036] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0037] like Figures 1 to 9 As shown, a precast pile with prefilled core includes:

[0038] The precast pile body 100 has an inner hole 110 and at least one end of the precast pile body 100 has an annular thickened layer 120, which is formed by the inner hole wall protruding towards the central axis of the inner hole 110.

[0039] End plate 200 is provided on the end face of the precast pile body 100 corresponding to the end with the thickened layer 120. End plate 200 is provided with at least two connecting holes 210, and each connecting hole 210 is arranged around the central axis of the inner hole 110.

[0040] The connector 400 has an external part on its outer surface that connects to the connection hole 210, and the lower section of the connector 400 is connected to a core-filling anchoring steel bar 310 embedded in the thickened layer 120.

[0041] The precast pile body 100 is a hollow reinforced concrete pipe pile prefabricated in a factory. The inner wall of the pile body's borehole 110 protrudes inward to form a thickened layer 120 (the wall thickness of traditional standard precast piles is uniform). Since the thickened layer 120 is located on the wall of the inner borehole 110, the inner borehole 110 of the precast pile body 100 is similar to a stepped borehole structure. The thickened layer 120 is equivalent to a ring-shaped thickened rib or boss on the inner wall of the precast pile, making the pile wall thicker in the corresponding area of ​​the precast pile body 100, effectively replacing... Figure 10The concrete core structure. The core anchoring steel bars 310 can form a reinforced concrete structure with the thickened layer 120.

[0042] The end plate 200 is designed as a flange structure. The outer diameter of the end plate 200 matches the outer diameter of the precast pile body 100, and the inner diameter of the end plate 200 matches the outer diameter of the inner hole 110. The end plate 200 is the foundation for connecting the precast pile body 100 to the upper pile cap. The core-filling anchoring steel bars 310 are inserted and anchored in the thickened layer 120 of the precast pile body 100.

[0043] Precast piles with pre-filled cores replace the concrete core-filling structure with a thickened layer 120 (equivalent to the thickened layer 120 on the inner wall of the pipe pile). The thickened layer 120 enhances the compressive and shear strength of the upper region of the precast pile body 100, preventing the pile head from being crushed under immense pressure. It also provides sufficient anchorage length and bond force for the first anchoring steel bar 320 connecting to the pile cap, effectively transferring the upper load to the pile body. Furthermore, it eliminates the core-filling step (pouring concrete into the pile core and inserting the reinforcing cage) in traditional pipe pile construction, thereby improving construction efficiency and reducing costs and complexity. Specifically, the thickened layer 120 of the precast pile body 100 pre-embeds the core-filling anchoring steel bar 310, replacing the core-filling reinforced concrete, achieving the effect of factory-produced precast piles and core-filling in one go, eliminating the on-site core-filling construction step and saving construction time.

[0044] It should also be noted that, since the precast pile body 100 has an inner hole 110, and the top of the inner hole 110 is not sealed by the concrete filling structure, the mud or cement slurry in the pile hole can freely overflow during the pile driving process, significantly reducing the soil pressure on the borehole sidewall and achieving non-displacement pile driving. Moreover, when using the implanted pile construction method, if the top pile is a precast pile with pre-filled core, the mud or cement slurry left in the pile hole will harden and naturally form the bottom formwork of the foundation concrete, preventing concrete from leaking into the pile hole and causing local defects.

[0045] like Figures 1 to 5 As shown, based on the above embodiment, the top of the connector 400 is lower than the top of the end plate 200 or the two are flush, and the bottom of the connector 400 protrudes from the inner side of the end plate 200; the upper section of the connector 400 is connected to the first pier anchoring steel bar 320.

[0046] The core-filling anchoring steel bar 310 is inserted into and anchored in the thickened layer 120 of the precast pile body 100, so that the core-filling anchoring steel bar 310 is anchored together with the precast pile body 100; the first pile cap anchoring steel bar 320 is used to connect with the pile cap. The connector 400 is actually a mechanical connecting sleeve, which is fixed on the end plate 200 to fix the core-filling anchoring steel bar 310 and the first pile cap anchoring steel bar 320 to the end plate 200, and combine them into a coaxial and continuous steel bar structure. The core-filling anchoring steel bar 310 and the first pile cap anchoring steel bar 320 form a whole through the connector 400, so that the core-filling anchoring steel bar 310 and the first pile cap anchoring steel bar 320 are coaxial and integrally stressed and anchored into the pile cap, which strengthens the connection strength between the pile top and the pile cap.

[0047] It should be noted that the wall thickness of the thickened layer 120 can be designed according to actual needs, and the axial height of the thickened layer 120 needs to be greater than the length of the core-filling anchoring steel bar 310 to ensure that the core-filling anchoring steel bar 310 can be completely embedded in the thickened layer 120.

[0048] Based on the above embodiments, the connector 400 is provided with a first mounting hole 410, the upper end of the core-filling anchoring steel bar 310 is installed at the lower end of the first mounting hole 410, and the lower end of the first abutment anchoring steel bar 320 is installed at the upper end of the first mounting hole 410.

[0049] Based on the above embodiments, the first mounting hole 410 includes a first threaded section 411 and a second threaded section 412. The upper end of the core-filling anchoring steel bar 310 is threadedly connected to the first threaded section 411, and the lower end of the first bearing anchoring steel bar 320 is threadedly connected to the second threaded section 412. The thread direction of the first threaded section 411 is the same as or opposite to the thread direction of the second threaded section 412.

[0050] Based on the above embodiments, there is a non-threaded isolation section between the first threaded section 411 and the second threaded section 412, and the isolation section is located in the middle of the first mounting hole 410.

[0051] The purpose of setting up the non-threaded isolation section is to separate the first threaded section 411 and the second threaded section 412. The end of the filler anchoring steel bar 310 cannot be screwed in further after reaching the end of the first threaded section 411, thus providing an installation limit. Similarly, the end of the first foundation anchoring steel bar 320 cannot be screwed in further after reaching the end of the second threaded section 412. This design eliminates the problems of over-tightening or incomplete installation, ensuring that the installation depth of each steel bar is completely consistent, maximizing its anchorage length and effective thread engagement length, thereby guaranteeing that the connection strength meets the design expectations.

[0052] Based on the above implementation, the external part of the connector 400 is configured as an external thread section 413, and the connecting hole 210 is configured as a threaded hole structure. The connector 400 is threadedly connected to the connecting hole 210 through the external thread section 413.

[0053] The connector 400 can be screwed into the corresponding connection hole 210 of the end plate 200 to fix the connector 400 to the end plate 200.

[0054] In addition, the thread direction of the external thread section 413 is the same as that of the first thread section 411. When the core-filling anchoring steel bar 310 is screwed into the connector 400, the external thread section 413 can be directly screwed into the connecting hole 210 in the same direction. When the first foundation anchoring steel bar 320 is screwed into the second thread section 412 in the opposite direction, the rotation direction of the external thread section 413 of the connector 400 is the tightening direction, so as to avoid affecting the tightness between the connector 400 and the connecting hole 210 when the first foundation anchoring steel bar 320 is screwed in.

[0055] like Figures 1 to 9 As shown, based on the above-described embodiment, the end plate 200 is also connected to the main reinforcement 600 and the second foundation anchoring reinforcement 700. The main reinforcement 600 is embedded in the precast pile body 100 and one end of it is connected to the end plate 200. The second foundation anchoring reinforcement 700 is connected to the end plate 200.

[0056] The main reinforcement 600 is an inherent prestressed main reinforcement 600 in the precast pile body 100. It is arranged along the longitudinal length of the pile body, so that the pile concrete is always under compression, thus giving the precast pile body 100 extremely high bending and tensile strength. The second pile cap anchorage reinforcement 700 is a pre-set reinforcement specifically designed to connect to the upper pile cap. The precast pile body 100 is connected to the pile cap through the second pile cap anchorage reinforcement 700.

[0057] Based on the above implementation, at least one end plate anchoring steel bar 500 is also provided on the inner side of the end plate 200, the distance from the end plate anchoring steel bar 500 to the central axis of the inner hole 110 is greater than the distance from the main reinforcement bar 600 to the central axis of the inner hole 110; and / or, the length of the end plate anchoring steel bar 500 is less than or equal to the length of the filling core anchoring steel bar 310.

[0058] The end plate anchoring steel bar 500 is a steel bar pre-installed on the end plate 200. It is used to insert and anchor inside the precast pile body 100, so that the end plate 200 and the precast pile body 100 are fixed together, enhancing the connection performance between the end plate 200 and the pile body and preventing relative slippage between the two.

[0059] like Figures 1 to 4 As shown, based on the above embodiment, the top of the thickened layer 120 extends to the top surface of the precast pile body 100, and the top surface of the thickened layer 120 is flush with the top surface of the precast pile body 100.

[0060] Based on the above implementation method, the end plate 200 is coaxially arranged with the precast pile body 100, the end plate 200 is configured as a flange structure, and the circumferential width of the end plate 200 is less than or equal to the sum of the wall thickness of the precast pile body 100 and the wall thickness of the thickened layer (120).

[0061] The end plate 200 needs to fully cover the top part of the precast pile body 100. The top surface of the pre-filled core precast pile includes the top surface of the precast pile body 100 and the top surface of the thickened layer 120. Therefore, the circumference of the end plate 200 should be equal to or slightly less than the wall thickness of the ordinary section of the pile body plus the protruding thickness of the thickened layer 120 inside the pile end to ensure the reliability of the pile head.

[0062] like Figures 1 to 9 As shown, based on the above implementation method, the end plate 200 is provided with mounting holes 220. The number of mounting holes 220 is consistent with the number of main reinforcement 600 / second foundation anchor reinforcement 700 and is provided one-to-one. The mounting hole 220 includes a pier head hole 221 and a connecting hole 222 located on both sides of it. The pier head hole 221 and the connecting hole 222 are connected. The end of the main reinforcement 600 has a pier head 610.

[0063] The main reinforcement 600 is connected to the pier head hole 221, and the pier head 610 is located at the large hole end of the pier head hole 221; the second pier anchor reinforcement 700 is connected to the connecting hole 222. Preferably, the connecting hole 222 is configured as a threaded hole structure, and the end of the second pier anchor reinforcement 700 is threadedly connected to the connecting hole 222.

[0064] During actual installation, the main reinforcement bar 600 is first inserted into the pier head hole 221 until the pier head 610 is located inside the large hole end of the pier head hole 221. Then, the second pier cap anchoring reinforcement bar 700 is screwed into the connecting hole 222. At this point, the main reinforcement bar 600 cannot be retracted into the connecting hole 222.

[0065] Based on the above implementation method, each mounting hole 220 is arranged in a ring, each connecting hole 210 is arranged in a ring, and the diameter of the ring track where each mounting hole 220 is located is greater than the diameter of the ring track where each connecting hole 210 is located.

[0066] Each connecting hole 220 corresponds to the top surface of the precast pile body 100, while each mounting hole 210 corresponds to the top surface of the thickened layer 120. Since the thickened layer 120 is located on the inner wall of the precast pile body 100, the diameter of the annular trajectory of each mounting hole 220 is larger than the diameter of the annular trajectory of each connecting hole 210.

[0067] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0068] Furthermore, in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0069] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0070] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

Claims

1. A precast pile with pre-filled core, characterized in that, include: The precast pile body (100) is provided with an inner hole (110), and the precast pile body (100) has an annular thickened layer (120) at at least one end, the thickened layer (120) being formed by protruding from the wall of the inner hole (110) toward the central axis of the inner hole (110); End plate (200), the end plate (200) is disposed on the end face of the precast pile body (100) corresponding to the end of the thickened layer (120), the end plate (200) is provided with at least two connecting holes (210), each of the connecting holes (210) is arranged around the central axis of the inner hole (110); A connector (400) is provided on the outer surface of which is connected to the connecting hole (210), and the lower section of the connector (400) is connected to a core-filling anchoring steel bar (310) embedded in the thickened layer (120).

2. The precast pile with pre-filled core as described in claim 1, characterized in that: The top of the connector (400) is lower than or flush with the top of the end plate, and the bottom of the connector (400) protrudes from the inside of the end plate (200); the upper segment of the connector (400) is connected to the first pier anchoring steel bar (320).

3. A precast pile with pre-filled core as described in claim 2, characterized in that: The connector (400) is provided with a first mounting hole (410), the upper end of the core-filling anchoring steel bar (310) is installed at the lower end of the first mounting hole (410), and the lower end (320) of the first pier anchoring steel bar (320) is installed at the upper end of the first mounting hole (410).

4. A precast pile with pre-filled core as described in claim 3, characterized in that: The first mounting hole (410) includes a first threaded section (411) and a second threaded section (412). The upper end of the core-filling anchoring steel bar (310) is threadedly connected to the first threaded section (411), and the lower end of the first pier anchoring steel bar (320) is threadedly connected to the second threaded section (412). The thread direction of the first threaded section (411) is the same as or opposite to the thread direction of the second threaded section (412).

5. A precast pile with pre-filled core as described in claim 4, characterized in that: There is a non-threaded isolation section between the first threaded section (411) and the second threaded section (412), and the isolation section is located in the middle of the first mounting hole (410).

6. A precast pile with pre-filled core as described in claim 1, characterized in that: The external part of the connector (400) is configured as an external thread section (413), and the connecting hole (210) is configured as a threaded hole structure. The connector (400) is threadedly connected to the connecting hole (210) through the external thread section (413).

7. A precast pile with pre-filled core as described in claim 1, characterized in that: The end plate (200) is also connected to a main reinforcement bar (600) and a second foundation anchoring reinforcement bar (700). The main reinforcement bar (600) is embedded in the precast pile body (100) and one end of it is connected to the end plate (200). The second foundation anchoring reinforcement bar (700) is connected to the end plate (200).

8. A precast pile with pre-filled core as described in claim 7, characterized in that: At least one end plate anchoring steel bar (500) is also provided on the inner side of the end plate (200), and the distance from the end plate anchoring steel bar (500) to the central axis of the inner hole (110) is greater than the distance from the main bar (600) to the central axis of the inner hole (110). And / or, the length of the end plate anchoring reinforcement (500) is less than or equal to the length of the core-filling anchoring reinforcement (310).

9. A precast pile with pre-filled core as described in claim 1, characterized in that: The top of the thickened layer (120) extends to the top surface of the precast pile body (100), and the top surface of the thickened layer (120) is flush with the top surface of the precast pile body (100).

10. A precast pile with pre-filled core as described in any one of claims 1 to 9, characterized in that: The end plate (200) is coaxially arranged with the precast pile body (100), the end plate (200) is configured as a flange structure, and the circumferential width of the end plate (200) is less than or equal to the sum of the wall thickness of the precast pile body (100) and the wall thickness of the thickened layer (120).

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