Construction method of rigid pile composite foundation
Through prefabricated pipe pile technology, the difficulty of quality control, environmental impact and high cost in rigid pile composite foundation construction is solved, a simple and efficient construction process is achieved, and the foundation bearing capacity and construction safety are improved.
Patent Information
- Application Number
- CN202411770911.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-04
- Publication Date
- 2025-01-03
AI Technical Summary
The existing rigid pile composite foundation construction technology has problems such as difficult construction quality control, great environmental impact, long construction cycle and high cost.
Using prefabricated pipe pile technology, by making prefabricated pipe piles with an enlarged head at one end in the prefabricated factory, and hoisting, positioning and hammering to the design elevation at the construction site, the pile top welded and sealed steel plates to form a closed section to form a steel pipe concrete structure to improve the Stiffness and load sharing capacity of the pile body.
It improves the simplicity and economical construction, reduces environmental pollution and construction period, enhances the pile resistance and pile quality, and reflects the construction concept of safety, economy and environmental protection.
Smart Images
Figure CN119243694A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of rigid pile composite foundation treatment, in particular to a rigid pile composite foundation construction method. Background Art
[0002] Foundation treatment technology plays a vital role in the field of engineering construction. In the construction of industrial and civil buildings, transportation, water conservancy and other fields, the stability and safety of foundation treatment technology are directly related to the quality and life of the entire project. As a foundation treatment technology, rigid pile composite foundation treatment technology sets rigid piles in the natural foundation to form a composite foundation where the piles and the soil between the piles bear the load together, thereby significantly improving the bearing capacity of the foundation, reducing the settlement, and enhancing the seismic performance of the foundation.
[0003] Although the existing rigid pile composite foundation treatment technology has many advantages in terms of construction methods, such as significantly improving the bearing capacity of the foundation, it still has some disadvantages, such as: ① Difficulty in construction quality control: The construction quality control of rigid piles is relatively complex, and strict quality control measures and professional technicians are required during the construction process to ensure that the construction quality meets the design requirements ② Environmental impact: The construction process of rigid piles will produce environmental problems such as waste, and corresponding environmental protection measures need to be taken to reduce the impact on the environment ③ Long construction period: Compared with other foundation treatment technologies, the construction of rigid pile composite foundations includes multiple links such as drilling, pouring, and maintenance, and the period is usually longer ④ High cost: A large part of the current construction cost of rigid pile composite foundations is spent on construction equipment costs, material costs, and labor costs. Summary of the invention
[0004] In order to solve the above problems, the present invention provides a rigid pile composite foundation construction method, which can specifically adopt the following technical solutions: The rigid pile composite foundation construction method of the present invention comprises the following steps: The first step is to use the centrifugal method to make a prefabricated pipe pile with an enlarged head at one end in the prefabrication plant, wherein the outer jacket steel pipe is used as an outer mold during centrifugal construction for the enlarged head; The second step is to transport the prefabricated pipe piles with enlarged heads to the construction site; The third step is to hoist and position the prefabricated pipe piles, use the enlarged head as the end of the prefabricated pipe piles, and use hammering, static pressure and other methods to construct the prefabricated pipe piles to the designed elevation; The fourth step is to weld a closed steel plate on the top of the prefabricated pipe pile to form a closed section; The fifth step is to construct a cushion layer on top of the pile to form a rigid pile composite foundation.
[0005] The prefabricated pipe pile 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 longitudinally arranged 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, an outer steel pipe 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 outer steel pipe 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 outer steel pipe; the closed steel plate is arranged on the top of the enlarged head and is welded to the upper end plate, and is used to close the central cavity of the enlarged head.
[0006] 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, and 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.
[0007] The outer jacket steel pipe is a top-less and bottom-free funnel-shaped structure consistent with the outer contour of the concrete pile cap.
[0008] The inner diameter of the upper end plate is equal to the inner diameter of the concrete pile cap.
[0009] 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.
[0010] The prestressed steel bars and spiral stirrups extend upward into the concrete pile cap.
[0011] The pile body and the enlarged head are integrated prefabricated parts of a pre-tensioned prestressed concrete structure.
[0012] In the step five, the closed steel plate is located in the cushion layer on the top of the pile, and the lower surface of the closed steel plate is flush with the original base surface line.
[0013] The rigid pile composite foundation construction method provided by the present invention optimizes the structure of the prefabricated pipe pile, and an enlarged head is set on the top of the prefabricated pipe pile, and the pile top enlarged head and the prefabricated pipe pile body are an integrated prefabricated structure, so that a closer connection is generated between the pile body and the pile cap. The above-mentioned 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 above-mentioned pile top enlarged head part is covered with an outer sleeve steel pipe on the outside to form a steel tube concrete structure to ensure the force performance of this part; the top 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 designed elevation.
[0014] Compared with the prior art, the advantages of the present invention are as follows: 1) The prefabricated enlarged head on the pile top is used to replace the cast-in-place reinforced concrete pile cap, which improves the degree of prefabrication and assembly, simplifies the construction, saves construction time, and reduces environmental pollution; 2) No need to pour core-fill concrete, which reduces the amount of pile cap materials and improves the economic efficiency of the structure; 3) By increasing the cross-section of the pile top and forming a steel tube concrete structure, the impact resistance of the pile top is improved, the damage rate of the pile head during hammering construction is reduced, and the quality of the pile is ensured.
[0015] It can be seen that the present invention embodies the green construction concept of safety, economy, applicability, environmental protection and civilization, and is very worthy of promotion and application in the industry. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a structural schematic diagram of the prefabricated pipe pile of the present invention.
[0017] Figure 2 yes Figure 1 Top view of the .
[0018] Figure 3 yes Figure 1 AA cross-section diagram.
[0019] Figure 4 yes Figure 1 BB cross-section diagram.
[0020] Figures 5 to 8 It is a schematic diagram of the construction steps of the present invention. 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 on the premise of the technical solution of the present invention, and a detailed implementation method and a specific construction process are given, but the protection scope of the present invention is not limited to the following embodiment.
[0022] like Figure 1-4As shown, the rigid pile composite foundation construction method of the present invention is realized by optimizing the structure of the prefabricated pipe pile. The prefabricated pipe pile is composed of a pile body 1, an enlarged head 2 and a closed steel plate 3. The pile body 1 includes a concrete pipe wall 11, a prestressed steel bar 12 and a spiral stirrup 13. The concrete pipe wall 11 is a vertical pipe of a hollow structure. The prestressed steel bar 12 is longitudinally arranged and distributed in the concrete pipe wall 11 along the annular direction. The spiral stirrup 13 is welded on the outside of the prestressed steel bar 12. The enlarged head 2 includes a concrete pile cap 21, an outer steel pipe 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 is composed of an equal cross-section section on the top and a variable cross-section section on the bottom. The variable cross-section section is an intermediate transition section that gradually expands from the top of the pile body 1 to the equal cross-section section. Preferably, the equal cross-section section maintains a height of at least 50 cm, and the prestressed steel bar 12 and the spiral stirrup 13 extend upward from the pile body 1 to the top of the concrete pile cap 21. The outer steel pipe 22 is a funnel-shaped structure without top or bottom arranged outside the circumference of the concrete pile cap 21, and the inner wall of the outer steel pipe 22 is fitted with the outer wall of the concrete pile cap 21, and the contours of the two are consistent. The upper end plate 23 is an annular steel plate arranged on the top surface of the concrete pile cap 21, which is fitted 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 outer steel pipe 22. The closing steel plate 3 is arranged on the top of the enlarged head 2 and is welded to the upper end plate 23, and is used to close the central cavity of the enlarged head 2. Specifically, the closing steel plate 3 is a circular steel plate coaxially arranged 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. When 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 integrated prefabricated parts of the prestressed concrete structure, and the closed steel plate 3 is welded and installed after the prefabricated pipe pile is constructed on site to the designed elevation.
[0023] like Figure 5-8 As shown, the rigid pile composite foundation construction method of the present invention comprises the following steps: The first step is to use a centrifugal method to make a prefabricated pipe pile with an enlarged head 2 at one end in a prefabrication plant, wherein the pile body 1 and the enlarged head 2 are prefabricated as a whole, which is a prestressed concrete structure by pretensioning method. The concrete pile cap 21 of the enlarged head 2 uses the outer jacket steel pipe 22 as an outer mold during centrifugal construction, and the upper end plate 23 is welded to the outer jacket steel pipe 22 as a whole after the prefabricated pipe pile is formed; The second step is to transport the prefabricated pipe pile with the enlarged head 2 to the construction site; The third step is to hoist and position the prefabricated pipe pile, use the top of the enlarged head 2 as the end of the prefabricated pipe pile, and use hammering, static pressure and other methods to construct the prefabricated pipe pile to the designed elevation; The fourth step is to weld a closed steel plate 3 on the top of the prefabricated pipe pile to form a closed section; The fifth step is to construct the pile top cushion layer 4 to form a rigid pile composite foundation.
[0024] The present invention adopts a prefabricated enlarged head on the pile top to replace the cast-in-place reinforced concrete pile cap, thereby improving the degree of prefabrication and assembly; and there is no need to cast core-filling 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.
[0025] It should be noted that, in the description of the present invention, terms indicating orientation or positional relationships, such as "front", "rear", "left", "right", "vertical", "horizontal", "inside", "outside", etc., are based on the orientation or positional relationships shown in the drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
Claims
1. A rigid pile composite foundation construction method, characterized in that: The steps include: The first step is to use the centrifugal method to make a prefabricated pipe pile with an enlarged head at one end in the prefabrication plant, wherein the outer jacket steel pipe is used as an outer mold during centrifugal construction for the enlarged head; The second step is to transport the prefabricated pipe piles with enlarged heads to the construction site; The third step is to hoist and position the prefabricated pipe piles, use the enlarged head as the end of the prefabricated pipe piles, and use hammering, static pressure and other methods to construct the prefabricated pipe piles to the designed elevation; The fourth step is to weld a closed steel plate on the top of the prefabricated pipe pile to form a closed section; The fifth step is to construct a cushion layer on top of the pile to form a rigid pile composite foundation.
2. The rigid pile composite foundation construction method according to claim 1, characterized in that: The prefabricated pipe pile 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 longitudinally arranged 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, an outer steel pipe 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 outer steel pipe 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 outer steel pipe; the closed steel plate is arranged on the top of the enlarged head and is welded to the upper end plate, and is used to close the central cavity of the enlarged head.
3. The rigid pile composite foundation construction method 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, and 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.
4. The rigid pile composite foundation construction method according to claim 1, characterized in that: The outer jacket steel pipe is a top-less and bottom-free funnel-shaped structure consistent with the outer contour of the concrete pile cap.
5. The rigid pile composite foundation construction method 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.
6. The rigid pile composite foundation construction method 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, and the edge of the closed steel plate is welded to the upper end plate.
7. The rigid pile composite foundation construction method according to claim 1, characterized in that: The prestressed steel bars and spiral stirrups extend upward into the concrete pile cap.
8. The rigid pile composite foundation construction method according to claim 1, characterized in that: The pile body and the enlarged head are integrated prefabricated parts of a pre-tensioned prestressed concrete structure.
9. The rigid pile composite foundation construction method according to claim 1, characterized in that: In the step five, the closed steel plate is located in the cushion layer on the top of the pile, and the lower surface of the closed steel plate is flush with the original base surface line.