Combined pile structure
By combining pile structures, the combination of cement soil piles and prestressed concrete pipe piles is solved, and a high-strength and widely applicable pile foundation structure is achieved, reducing construction costs and improving efficiency.
Patent Information
- Application Number
- CN202421463573.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-25
- Publication Date
- 2025-04-29
- Estimated Expiration
- 2034-06-25
AI Technical Summary
In the construction of engineering along the coastal and riverside areas in my country, the foundation soil is weak, has poor stability and low bearing capacity. The existing pile construction technology has defects such as difficulty in penetration, limited processing depth, noise pollution, and mud emission pollution, resulting in high construction costs and low efficiency.
It provides a combined pile structure, consisting of cement soil piles and prestressed concrete pipe piles. Cement soil piles wrap prestressed concrete pipe piles, and steel pallets and anti-pull ribs are installed inside. The top of the pipe pile pile is higher than the top of the soil pile pile pile, which is suitable for different formation conditions.
This combined pile structure has high bending, tensile and shear strength, and is suitable for a wide range of strata. It can improve the compressive and pull-out resistance of the pile foundation, reduce engineering costs, and improve construction efficiency and labor costs.
Smart Images
Figure CN222809998U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of building construction, and in particular to a combined pile structure. Background Art
[0002] In the construction projects along the coast and along the river in my country, the foundation soil is generally weak, with poor stability and low bearing capacity. At present, the technologies used in the foundation treatment and foundation pit retaining projects in my country mainly include: vibration or static pressure pile sinking, bored pile, rammed pile, cement soil mixing pile or high pressure jet grouting pile, etc. These construction processes often have many defects and are restricted by engineering geology and construction environment. For example, static pressure piles are difficult to penetrate when encountering silt or silt sand layers, the treatment depth of deep mixing piles is limited, static pressure piles have too high requirements for the working site conditions, vibration pipe sinking piles have noise pollution, bored piles produce mud discharge pollution, and rammed piles have vibration (vibration) disturbances. Due to the low strength of deep mixing cement soil piles themselves, they are often used only as water-stop curtains, and cannot be used as single bearing piles. This often causes difficulties in design and construction, and greatly increases the construction cost.
[0003] In view of the construction difficulty and strength deficiencies of the above-mentioned pile types when used separately, it is urgent to provide a combined pile structure to solve the above-mentioned technical problems. Utility Model Content
[0004] Based on this, a composite pile structure is provided, which consists of a cement soil pile and a prestressed concrete pipe pile. The composite pile structure has high bending, tensile and shear strength, and will be able to meet different bearing requirements. It can also realize the application of prestressed concrete pipe piles in silt, thereby improving the compression and pull-out resistance of the pile foundation. Compared with cast-in-place piles, it reduces the project cost, improves the construction efficiency, and reduces labor costs.
[0005] On the one hand, a combined pile structure is provided, comprising: a cement-soil pile and a prestressed concrete pipe pile; the cement-soil pile wraps the prestressed concrete pipe pile, and the pipe pile top of the prestressed concrete pipe pile is higher than the soil pile top of the cement-soil pile; a steel support plate is arranged inside the prestressed concrete pipe pile; a first anti-pullout reinforcement which is arranged in an annular manner and welded to the steel support plate is connected to the steel support plate, and the upper end of the first anti-pullout reinforcement extends to the inside of the foundation pedestal.
[0006] An optional solution is that the steel support plate is a 4-6 mm thick round thin steel plate; the outer circumference of the steel support plate is connected to the inner circumference of the prestressed concrete pipe pile.
[0007] An optional solution is that a plurality of standoff steel bars are arranged at intervals from top to bottom inside the prestressed concrete pipe pile; and the standoff steel bars connect two adjacent first tensile reinforcement bars in the same horizontal section.
[0008] An optional solution is to pour core-filled concrete into the prestressed concrete pipe piles in the area above the steel support plate.
[0009] An optional solution is that a plurality of cross steel bars are arranged on the top of the prestressed concrete pipe pile; the intersection of the plurality of cross steel bars is located at the center of the prestressed concrete pipe pile; each cross steel bar connects two of the first tensile reinforcement bars in the same radial direction; and the diameter of the cross steel bars is 9-11 mm.
[0010] An optional solution is that the top of the prestressed concrete pipe pile is connected to a second anti-pullout reinforcement arranged in an annular manner; the upper end of the second anti-pullout reinforcement extends to the interior of the foundation cap.
[0011] An optional solution is that a plurality of connecting sleeves are pre-embedded in the top of the prestressed concrete pipe pile; the plurality of connecting sleeves are distributed in a ring on the top of the pipe pile and are arranged one-to-one with the second anti-pullout reinforcement; the lower end of the second anti-pullout reinforcement is connected to the connecting sleeve, and the two are arranged coaxially.
[0012] An optional solution is that the connecting sleeve is provided with an internal threaded hole; the lower end of the second anti-pullout reinforcement is provided with an external thread, and the lower end of the second anti-pullout reinforcement is threadedly connected in the connecting sleeve.
[0013] An optional solution is that the diameter of the first anti-pullout reinforcement is 20-32 mm; the diameter of the second anti-pullout reinforcement is 20-25 mm.
[0014] Beneficial effects:
[0015] The above-mentioned combined pile structure uses a mixing pile equipment to mix the soil with cement slurry to form a cement soil pile, and then a high-strength prestressed concrete pipe pile is driven into the center of the cement soil pile as required, thereby forming a combined pile structure. The combined pile structure has high bending, tensile and shear strength, and is applicable to a wide range of strata. It can realize the application of prestressed concrete pipe piles in silt, improve the compression and pull-out resistance of the pile foundation, and reduce engineering costs compared to cast-in-place piles, and also improve construction efficiency and reduce labor costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 A schematic diagram of the structure of a combined pile structure in one embodiment;
[0017] Figure 2 for Figure 1 Top view after removing the foundation cap.
[0018] Figure numerals: 1. cement soil pile; 11. top of soil pile; 2. prestressed concrete pipe pile; 21. top of pipe pile; 3. steel support plate; 4. first anti-tension reinforcement; 5. foundation pedestal; 6. erection reinforcement; 7. core filling concrete; 8. cross reinforcement; 9. second anti-tension reinforcement; 101. connecting sleeve; 102. concrete foundation cushion. DETAILED DESCRIPTION
[0019] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.
[0020] It should be noted that the illustrations provided in this embodiment only illustrate the basic concept of the present application in a schematic manner, and therefore the drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.
[0021] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which this application can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by this application, should still fall within the scope of the technical contents disclosed in this application.
[0022] The directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "middle", "longitudinal", "lateral", "horizontal", "inner", "outer", "radial", "circumferential" and the like in this specification are based on the directions or positional relationships shown in the drawings and are only for the convenience of simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.
[0023] The present application provides a combined pile structure, which is described in detail below. Figure 1 As shown, it includes: a cement soil pile 1 and a prestressed concrete pipe pile 2, the cement soil pile 1 wraps the prestressed concrete pipe pile 2, and the pipe pile top 21 of the prestressed concrete pipe pile 2 is higher than the soil pile top 11 of the cement soil pile 1; a steel support plate 3 is arranged inside the prestressed concrete pipe pile 2, and the steel support plate 3 is connected to a first anti-pullout reinforcement 4 which is arranged in an annular manner and welded to the steel support plate 3, and the upper end of the first anti-pullout reinforcement 4 extends to the inside of the foundation cap 5.
[0024] In this embodiment, a pile mixing machine is used to first mix the soil with cement slurry to form a cement soil pile 1, and then a high-strength prestressed concrete pipe pile 2 is driven into the center of the cement soil pile 1 as required, and a steel support plate 3 is arranged inside the prestressed concrete pipe pile 2, and a first anti-pullout reinforcement 4 extending to the inside of the foundation cap 5 is welded on the steel support plate 3. The combined pile formed in this way has high bending, tensile and shear strength, can meet different bearing requirements, and can reduce engineering costs, improve construction efficiency, and reduce labor costs compared to cast-in-place piles. More importantly, it is widely applicable to strata, and can be used in silt, silty clay, clay, silt, silt sand layer, etc. The deep mixing cement soil pile 1 greatly improves the lateral friction resistance of the prestressed concrete pipe pile 2, improves the friction coefficient of the combined pile structure, and greatly improves the compressive and pullout resistance, and can be used as a pullout pile.
[0025] Please continue to refer to Figure 1 , Figure 2 As shown, in this embodiment, it should be noted that the steel support plate 3 is set to a 4-6mm thick round thin steel plate, preferably, the steel support plate 3 is set to a 5mm thick round thin steel plate, and the outer peripheral surface of the steel support plate 3 is connected to the inner peripheral surface of the prestressed concrete pipe pile 2 (the cross-section of the steel support plate 3 is circular, and the diameter is the same as the diameter of the prestressed concrete pipe pile 2 or is 0.5-1mm smaller than the diameter of the prestressed concrete pipe pile 2). A plurality of stand steel bars 6 are arranged from top to bottom in the prestressed concrete pipe pile 2, and the stand steel bars 6 are set to a circular shape. The stand steel bars 6 are arranged between two adjacent first anti-pullout bars 4 at the same horizontal cross section, and the two ends of the stand steel bars 6 are respectively welded and connected to the two adjacent first anti-pullout bars 4. Therefore, in this embodiment, the upper end of the first anti-pullout reinforcement 4 is connected to the foundation pedestal 5, the lower end of the first anti-pullout reinforcement 4 extends downward into the prestressed concrete pipe pile 2 and is welded and fixed on the steel support plate 3, and the frame steel bar 6 in the prestressed concrete pipe pile 2 is welded to the first anti-pullout reinforcement 4, so that the first anti-pullout reinforcement 4, the steel support plate 3, and the frame steel bar 6 form a whole. The core-filling concrete 7 is poured above the steel support plate 3 in the prestressed concrete pipe pile 2, and the concrete foundation cushion layer 102 is laid on the surface of the foundation soil, that is, the top 11 of the soil pile of the cement soil pile 1, and the foundation pedestal 5 is cast on the concrete foundation cushion layer 102 and the upper end of the prestressed concrete pipe pile 2. Therefore, in this embodiment, the frame steel bar 6 and the first anti-pullout reinforcement 4 are combined in the core-filling concrete 7 cast in the prestressed concrete pipe pile 2, which can ensure the effective connection between the prestressed concrete pipe pile 2 and the foundation pedestal 5, so that the force of the foundation pedestal 5 is evenly transmitted to the prestressed concrete pipe pile 2.
[0026] When in use, after the construction of the prestressed concrete pipe pile 2 is completed, the first anti-tension reinforcement 4 is first welded to the frame reinforcement 6 and the steel support plate 3, and the whole is placed in the prestressed concrete pipe pile 2, and then the core filling concrete 7 is poured to the pile head elevation, and then the concrete foundation cushion layer 102 is set, and the foundation cap 5 is poured.
[0027] Please continue to refer to Figure 1 , Figure 2 As shown, in this embodiment, it is also necessary to explain that a plurality of cross steel bars 8 are arranged on the pile top 21 of the prestressed concrete pipe pile 2, and the intersection of the plurality of cross steel bars 8 is located at the center of the prestressed concrete pipe pile 2, and each cross steel bar 8 connects two first anti-pullout bars 4 in the same radial direction. As in this embodiment, eight first anti-pullout bars 4 are arranged, and the eight first anti-pullout bars 4 are distributed in a ring shape, and four cross steel bars 8 are arranged, and four cross steel bars 8 are arranged crosswise, and each cross steel bar 8 connects two first anti-pullout bars 4 in the same radial direction, thereby enhancing the stability of the first anti-pullout bars 4 and the bending, tensile and shear strengths. Preferably, the diameter of the cross steel bars 8 is 9-11 mm, and the diameter of the first anti-pullout bars 4 is 20-32 mm.
[0028] Please refer to Figure 1 As shown, in this embodiment, it is also necessary to explain that a plurality of connecting sleeves 101 are pre-buried in the pile top 21 of the prestressed concrete pipe pile 2, and the plurality of connecting sleeves 101 are distributed in an annular manner on the pile top 21. A second anti-pullout reinforcement 9 is welded on each connecting sleeve 101, and the connecting sleeve 101 and the second anti-pullout reinforcement 9 are coaxially arranged, and the upper end of the second anti-pullout reinforcement 9 extends to the inside of the foundation cap 5. In this embodiment, by welding the lower end of the second anti-pullout reinforcement 9 to the connecting sleeve 101 and the upper end extending to the inside of the foundation cap 5, the effective connection between the prestressed concrete pipe pile 2 and the foundation cap 5 can be further ensured, so that the force of the foundation cap 5 is evenly transmitted to the prestressed concrete pipe pile 2. Preferably, the diameter of the second anti-pullout reinforcement 9 is 20-25 mm.
[0029] In one practicable manner, an internal threaded hole is provided on the connecting sleeve 101, and the lower end of the second anti-pullout reinforcement 9 is provided with an external thread that matches the internal threaded hole on the connecting sleeve 101, so that the lower end of the second anti-pullout reinforcement 9 is fixed to the connecting sleeve 101 through a threaded connection, and the upper end of the second anti-pullout reinforcement 9 is arranged in the foundation pedestal 5. This connection method reduces welding and greatly saves construction time and cost. Of course, in addition to welding and threaded connection, the connection method between the connecting sleeve 101 and the second anti-pullout reinforcement 9 can also be other methods such as clamping, which is not specifically limited in this embodiment.
[0030] The implementation principle of this embodiment is as follows: when in use, after the construction of the prestressed concrete pipe pile 2 is completed, the first anti-pullout reinforcement 4 is first welded with the erection steel bar 6 and the steel support plate 3 to form a whole, and then the whole is placed in the prestressed concrete pipe pile 2, and a connecting sleeve 101 is pre-buried at the pile top 21 of the prestressed concrete pipe pile 2, and the second anti-pullout reinforcement 9 is threadedly connected to the connecting sleeve 101, and the core-filling concrete 7 is poured to the pile head elevation, and then a concrete foundation cushion layer 102 is laid on the foundation soil surface, that is, the soil pile top 11 of the cement soil pile 1, and a foundation cap 5 is poured on the upper end of the concrete foundation cushion layer 102 and the pile top 21.
[0031] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0032] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.
Claims
1. A combined pile structure, characterized in that: include: Cement soil piles (1) and prestressed concrete pipe piles (2); The cement soil pile (1) wraps the prestressed concrete pipe pile (2), and the pipe pile top (21) of the prestressed concrete pipe pile (2) is higher than the soil pile top (11) of the cement soil pile (1); A steel support plate (3) is arranged inside the prestressed concrete pipe pile (2); The steel support plate (3) is connected to a first anti-pullout reinforcement (4) which is arranged in an annular manner and welded to the steel support plate (3), and the upper end of the first anti-pullout reinforcement (4) extends to the inside of the foundation bearing platform (5).
2. The combined pile structure according to claim 1, characterized in that: The steel support plate (3) is a round thin steel plate with a thickness of 4-6 mm; The outer peripheral surface of the steel support plate (3) is connected to the inner peripheral surface of the prestressed concrete pipe pile (2).
3. The combined pile structure according to claim 2, characterized in that: A plurality of supporting steel bars (6) are arranged at intervals from top to bottom inside the prestressed concrete pipe pile (2); The erection steel bars (6) connect two adjacent first anti-tension bars (4) in the same horizontal cross section.
4. The combined pile structure according to claim 3, characterized in that: The prestressed concrete pipe pile (2) is poured with core-filling concrete (7) in the area above the steel support plate (3).
5. The combined pile structure according to claim 1, characterized in that: The pile top (21) of the prestressed concrete pipe pile (2) is provided with a plurality of cross steel bars (8); The intersection of the plurality of cross steel bars (8) is located at the center of the prestressed concrete pipe pile (2); Each of the cross steel bars (8) connects two of the first anti-tension bars (4) in the same radial direction; the diameter of the cross steel bars (8) is 9-11 mm.
6. The combined pile structure according to claim 1, characterized in that: The pile top (21) of the prestressed concrete pipe pile (2) is connected with a second anti-tension reinforcement (9) arranged in an annular manner; The upper end of the second anti-tension reinforcement (9) extends to the interior of the foundation bearing platform (5).
7. The combined pile structure according to claim 6, characterized in that: A plurality of connecting sleeves (101) are pre-buried in the pile top (21) of the prestressed concrete pipe pile (2); A plurality of the connecting sleeves (101) are distributed in an annular manner on the top of the pipe pile (21), and are arranged in one-to-one correspondence with the second anti-tension bars (9); The lower end of the second anti-tension bar (9) is connected to the connecting sleeve (101), and the two are coaxially arranged.
8. The combined pile structure according to claim 7, characterized in that: The connecting sleeve (101) is provided with an internal threaded hole; The lower end of the second anti-pullout reinforcement (9) is provided with an external thread, and the lower end of the second anti-pullout reinforcement (9) is threadedly connected in the connecting sleeve (101).
9. The combined pile structure according to claim 6, characterized in that: The diameter of the first anti-tension reinforcement (4) is 20-32 mm; The diameter of the second anti-tension reinforcement (9) is 20-25 mm.