Prefabricated tubular pile with expanded end

Abstract

The utility model discloses a prefabricated pipe pile with an expanded end part. The prefabricated pipe pile comprises a pile body, an expanded head and a closed steel plate, the pile body comprises a concrete pipe wall of a hollow structure, and prestressed steel bars and spiral stirrups are arranged in the concrete pipe wall. The expansion head comprises a concrete pile cap arranged at the top of the pile body, a steel sleeve is arranged on the outer side of the circumferential face of the concrete pile cap, an upper end plate is arranged on the top face of the concrete pile cap, and the upper edge of the steel sleeve is connected with the outer edge of the upper end plate in a welded mode. The sealing steel plate is arranged on the top of the expanding head, connected with the upper end plate in a welded mode and used for sealing a central cavity of the expanding head. According to the utility model, the construction is simple and convenient, the construction period is saved, core filling concrete does not need to be poured, the material consumption of the pile cap is reduced, the structural economy is improved, the section of the pile top is enlarged and a steel pipe concrete structure is formed, the impact resistance of the pile top part is improved, the damage rate of the pile head during hammering construction is reduced, and the pile forming quality is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to rigid pile composite foundation treatment technical field especially is related to a prefabricated pipe pile of end expansion. BACKGROUND

[0002] When the natural foundation cannot satisfy the requirement of the building to the foundation, the foundation treatment needs to be carried out, and the artificial foundation is formed to ensure the safety and normal use of the building. The composite foundation is a common artificial foundation, which is to set the reinforced material in the natural foundation or replace part of the land, so that the natural foundation soil body and the reinforcing body jointly bear the load action of the upper structure, thereby playing the role of foundation reinforcement, and is widely applied to the engineering construction in the fields of industrial and civil buildings, traffic, water conservancy and the like. The existing composite foundation includes the cement soil mixing pile composite foundation, the high-pressure jet grouting pile composite foundation and the sand pile foundation, and the construction process is complex, the quality control requirement is high, the construction period is relatively long, and other construction quality problems caused by improper maintenance exist universally. SUMMARY

[0003] In order to solve the above problems, the utility model provides a prefabricated pipe pile of end expansion, and the following technical scheme can be specifically adopted:

[0004] The prefabricated pipe pile of end expansion, comprising a pile body, an enlarged head and a closed steel plate, wherein the pile body comprises a concrete pipe wall, prestressed reinforcement and spiral stirrups, the concrete pipe wall is a vertical pipe with a hollow structure, the prestressed reinforcement is longitudinally arranged and distributed in the concrete pipe wall in a ring direction, and the spiral stirrup is arranged outside the prestressed reinforcement; the enlarged head comprises a concrete pile cap, a steel sleeve and an upper end plate, the concrete pile cap is arranged at the top of the pile body, the concrete pile cap is a hollow funnel structure with the same inner diameter as the concrete pipe wall, the steel sleeve is arranged outside the peripheral surface of the concrete pile cap, and the upper end plate is an annular steel plate arranged on the top surface of the concrete pile cap and welded to the upper edge of the steel sleeve; and the closed steel plate is arranged at the top of the enlarged head and welded to the upper end plate to close the central cavity of the enlarged head.

[0005] The concrete pile cap is composed of an equal-section segment above and a variable-section segment below, the minimum length of the equal-section segment is 50cm, and the variable-section segment is an intermediate transition segment gradually expanding from the top of the pile body to the equal-section segment.

[0006] The steel sleeve is a funnel structure without top and bottom and consistent with the outer contour of the concrete pile cap.

[0007] The inner diameter of the upper end plate is equal to the inner diameter of the concrete pile cap.

[0008] The closed steel plate is a circular steel plate coaxially arranged with the enlarged head, and the outer diameter of the closed steel plate is larger than the inner diameter of the concrete pile cap, and the edge of the closed steel plate is welded to the upper end plate.

[0009] The prestressed steel bars and spiral stirrups extend upward into the concrete pile cap.

[0010] The pile body and the enlarged head are an integral prefabricated part of the pretensioned prestressed concrete structure.

[0011] The end part enlarged prefabricated pipe pile is mainly used for rigid pile composite foundation, an enlarged head is arranged at the top of the prefabricated pipe pile, and the pile top enlarged head and the pile body of the prefabricated pipe pile are integrally prefabricated into a molding structure, so that the pile body and the pile cap are more closely connected. The pile cap not only enhances the rigidity of the pile body, but also significantly improves the interaction force between the pile and the soil, so that the pile body can better share the upper load, thereby improving the overall bearing capacity of the foundation; the pile top enlarged head part is sleeved with a steel sleeve pipe on the outer side to form a steel pipe concrete structure to ensure the stress performance of this part; the top end of the enlarged head is welded with a closed steel plate to form a closed section, and the closed steel plate is welded after the prefabricated pipe pile is constructed to the design elevation.

[0012] Compared with the prior art, the advantages of the utility model are as follows:

[0013] 1) The pile top prefabricated enlarged head replaces the cast-in-place reinforced concrete pile cap, improves the prefabricated assembly degree, is simple in construction, saves construction period, and reduces environmental pollution;

[0014] 2) No core concrete needs to be poured, the amount of pile cap material is reduced, and the structural economy is improved;

[0015] 3) By increasing the pile top section and forming a steel pipe concrete structure, the resistance of the pile top part is improved, the damage rate of the pile head during hammering construction is reduced, and the pile forming quality is ensured.

[0016] It can be seen that the utility model embodies the green construction concept of safety, economy, applicability, environmental protection and civilization, and is very worthy of popularization and application in the industry. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structural schematic view of the utility model.

[0018] Figure 2 is Figure 1 a top view of the utility model.

[0019] Figure 3 is Figure 1 an A-A sectional view of the utility model.

[0020] Figure 4 is Figure 1 a B-B sectional view of the utility model. DETAILED DESCRIPTION

[0021] The following is a detailed description of an embodiment of the present invention in conjunction with the accompanying drawings. This embodiment is implemented based on the technical solution of the present invention, and a detailed implementation method and a specific construction process are given. However, the protection scope of the present invention is not limited to the following embodiment.

[0022] like Figures 1-4 As shown, the prefabricated tubular pile with expanded ends described in the present invention is composed of a pile body 1, an expanded head 2, and a closed steel plate 3. The pile body 1 includes a concrete pipe wall 11, prestressed steel bars 12, and spiral stirrups 13. The concrete pipe wall 11 is a vertical pipe with a hollow structure. The prestressed steel bars 12 are longitudinally arranged and distributed circumferentially within the concrete pipe wall 11. The spiral stirrups 13 are welded to the outside of the prestressed steel bars 12. The expanded head 2 includes a concrete pile cap 21, a steel casing 22, and an upper end plate 23. The concrete pile cap 21 is located at the top of the pile body and is a hollow funnel-shaped structure with the same inner diameter as the concrete pipe wall 11. It consists of an upper uniform cross-section section and a lower variable cross-section section. The variable cross-section section is an intermediate transition section that gradually expands from the top of the pile body 1 to the uniform cross-section section. Preferably, the uniform cross-section section maintains a height of at least 50 cm, and the prestressed steel bars 12 and spiral stirrups 13 extend upward from the pile body 1 to the top of the concrete pile cap 21. The steel casing 22 is a funnel-shaped structure without a top or bottom, installed on the outer surface of the concrete pile cap 21. The inner wall of the steel casing 22 is aligned with the outer wall of the concrete pile cap 21, and the two have the same contour. The upper end plate 23 is an annular steel plate installed on the top surface of the concrete pile cap 21. It is aligned with the top surface of the concrete pile cap 21, that is, the inner diameter of the upper end plate 23 is equal to the inner diameter of the concrete pile cap 21, and the outer diameter is also equal to the outer diameter of the concrete pile cap 21, so that the outer edge is welded to the upper edge of the steel casing 22. The closing steel plate 3 is installed on the top of the enlarged head 2 and welded to the upper end plate 23 to close the central cavity of the enlarged head 2. Specifically, the closing steel plate 3 is a circular steel plate installed coaxially with the enlarged head 2, and the outer diameter of the closing steel plate 3 is larger than the inner diameter of the concrete pile cap 21. During welding, the edge of the closing steel plate 3 is welded to the upper end plate 23. The pile body 1 and the enlarged head 2 are integral prefabricated parts of a pre-tensioned prestressed concrete structure, and the closing steel plate 3 is welded and installed after the prefabricated pipe pile is constructed on site to the designed elevation.

[0023] The utility model adopts a prefabricated enlarged head on the pile top to replace the cast-in-situ reinforced concrete pile cap, thereby improving the degree of prefabrication and assembly; and there is no need to cast core-fill concrete, thereby reducing the amount of pile cap material used; by increasing the cross-section of the pile top and forming a steel tube concrete structure, the impact resistance of the pile top part is improved, the breakage rate of the pile head during hammer construction is reduced, and the quality of the pile is guaranteed; it embodies the green construction concept of safety, economy, applicability, environmental protection and civilization.

[0024] It should be noted that in the description of the utility model, such as "front", "back", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating the orientation or positional relationship of the terms is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model.

Claims

1. A prefabricated pipe pile with enlarged ends, characterized by: It includes a pile body, an enlarged head and a closed steel plate; the pile body includes a concrete pipe wall, prestressed steel bars and spiral stirrups, the concrete pipe wall is a vertical pipe of a hollow structure, the prestressed steel bars are arranged longitudinally and distributed in the concrete pipe wall at intervals along the annular direction, and the spiral stirrups are arranged on the outside of the prestressed steel bars; the enlarged head includes a concrete pile cap, a steel casing and an upper end plate, the concrete pile cap is arranged on the top of the pile body, the concrete pile cap is a hollow funnel-shaped structure with the same inner diameter as the concrete pipe wall, the steel casing is arranged on the outside of the circumference of the concrete pile cap, and the upper end plate is an annular steel plate arranged on the top surface of the concrete pile cap, which is welded to the upper edge of the steel casing; the closed steel plate is arranged on the top of the enlarged head and welded to the upper end plate, for closing the central cavity of the enlarged head.

2. The prefabricated tubular pile with enlarged ends according to claim 1, characterized in that: The concrete pile cap consists of an upper uniform cross-section section and a lower variable cross-section section. The minimum length of the uniform cross-section section is 50 cm. The variable cross-section section is an intermediate transition section that gradually expands from the top of the pile body to the uniform cross-section section.

3. The prefabricated tubular pile with enlarged ends according to claim 1, characterized in that: The steel casing is a funnel-shaped structure without top or bottom that is consistent with the outer contour of the concrete pile cap.

4. The prefabricated tubular pile with enlarged ends according to claim 1, characterized in that: The inner diameter of the upper end plate is equal to the inner diameter of the concrete pile cap.

5. The prefabricated tubular pile with enlarged ends according to claim 1, characterized in that: The closed steel plate is a circular steel plate coaxially arranged with the enlarged head, and the outer diameter of the closed steel plate is larger than the inner diameter of the concrete pile cap. The edge of the closed steel plate is welded to the upper end plate.

6. The prefabricated tubular pile with enlarged ends according to claim 1, characterized in that: The prestressed steel bars and spiral stirrups extend upward into the concrete pile cap.

7. The prefabricated tubular pile with enlarged ends according to claim 1, characterized in that: The pile body and the enlarged head are integral prefabricated parts of a pre-tensioned prestressed concrete structure.

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