Double-inner-core stiff composite pile and construction method

Abstract

The invention relates to the technical field of stiff composite piles, in particular to a double-inner-core stiff composite pile and a construction method, the double-inner-core stiff composite pile comprises an outer pile and at least two inner cores, and the inner cores are uniformly arranged in the outer pile. The multiple inner cores are adopted, the contact area of the inner cores and the outer pile is increased, and therefore the stiff pile can obtain higher bearing capacity. A reinforcing plate is connected between the inner cores, connecting plates are fixed to the outer walls of the inner cores, the connecting plates are fixed to the outer walls of the inner cores in the axial direction of the inner cores, connecting grooves are formed in the connecting plates, and the two sides of the reinforcing plate are vertically inserted into the connecting grooves of the two connecting plates respectively. The inner cores are connected through the reinforcing plates, on one hand, the contact area with the outer pile can be further increased, on the other hand, the connection strength between the inner cores can be enhanced, and the stability of the inner cores is improved.

Description

Technical Field

[0001] The present application relates to the technical field of rigid composite piles, and in particular to a dual-core rigid composite pile and a construction method. Background Art

[0002] At present, the rigid composite pile is a composite carrier, usually a combination of concrete piles and prestressed pipe piles, and is often used in soft foundations such as silt, clay, silt, sand and artificial fill. In the related technology, a pile pit is usually dug first, and then a prestressed pipe pile is pre-buried in the pile pit, and then concrete is poured to form a layer of concrete piles outside the prestressed pipe piles.

[0003] For related technology, reference may be made to Chinese patent publication number CN102587360A, which discloses a large-diameter rigid composite pile, including an intermediate pile core, with peripheral piles arranged around the intermediate pile core; the diameter of the intermediate pile core is 300-600 mm, and the diameter of the peripheral piles is 650-1000 mm; the peripheral piles are cement powder sprayed piles.

[0004] The middle core of the composite pile is connected to the outer piles through contact with each other through the outer surface, the contact area is small, and the overall bearing capacity is low. Summary of the invention

[0005] In order to improve the bearing capacity, the present application provides a double inner core rigid composite pile.

[0006] One of the purposes of this application is to provide a double-core rigid composite pile, which adopts the following technical solution: A double inner core rigid composite pile comprises an outer pile and an inner core, wherein at least two inner cores are provided and the inner cores are evenly arranged in the outer pile.

[0007] By adopting the above technical solution and using multiple inner cores, the contact area between the inner core and the outer pile is increased, so that the rigid pile can obtain a higher bearing capacity.

[0008] Preferably, a reinforcing plate is connected between the inner cores, a connecting plate is fixed to the outer wall of the inner core, the connecting plate is fixed to the outer wall of the inner core along the axial direction of the inner core, a connecting groove is opened on the connecting plate, and both sides of the reinforcing plate are vertically inserted into the connecting grooves of the two connecting plates.

[0009] By adopting the above technical solution, the inner cores are connected to each other through the reinforcing plate, which can further increase the contact area with the outer pile on the one hand, and strengthen the connection strength between the inner cores on the other hand, thereby improving the stability of the inner core.

[0010] Preferably, the connecting plates are provided in a plurality and are linearly fixed to the outer wall of the inner core. The connecting plates are evenly fixed to the outer wall of the inner core, and discharge gaps are formed between the connecting plates.

[0011] By adopting the above technical solution, the outer pile is cast by concrete. When the inner core is inserted into the outer pile, the connecting groove is filled with concrete. When the reinforcing plate is inserted downward into the connecting groove, the concrete is discharged from the discharge gap, biased towards the insertion of the reinforcing plate.

[0012] Preferably, the connecting plate is provided with a plurality of horizontally arranged slurry discharge holes.

[0013] By adopting the above technical solution, when the reinforcing plate is inserted into the connecting groove, the concrete in the outer pile is discharged from the slurry discharge hole.

[0014] Preferably, the reinforcing plate is provided with a plurality of connecting rods corresponding one to one with the slurry discharge holes, and the connecting rods are passed through the slurry discharge holes.

[0015] By adopting the above technical solution, the reinforcing plate is inserted into the connecting groove, and the connecting rod is inserted into the slurry discharge hole, thereby enhancing the connection strength between the reinforcing plate and the connecting plate.

[0016] Preferably, the connecting rod is horizontally slidably connected in the reinforcing plate, a threaded barrel is rotatably connected in the reinforcing plate, the inner wall of the threaded barrel is provided with a bidirectional thread, the outer wall of the connecting rod is provided with an external thread connected to the thread of the threaded barrel, two connecting rods are provided, and the two connecting rods are respectively threadedly connected to the two ends of the threaded barrel, a rack is slidably connected in the reinforcing plate, and the outer wall of the threaded barrel is provided with a gear ring meshing with the rack.

[0017] By adopting the above technical solution, a sliding rack is used, and the rack drives the threaded barrel to rotate, thereby controlling the two connecting rods to move toward or away from each other synchronously. After the reinforcing plate is inserted into the connecting groove, the rack drives the threaded barrel to rotate, and the two connecting rods move away from each other, gradually extending out of the reinforcing plate and inserting into the slurry discharge hole.

[0018] Preferably, the inner core includes a pile column arranged in a cylindrical shape, a steel cage passed through the pile column, and concrete poured into the pile column. The connecting plate is integrally connected to the pile column. The pile column is provided with a plurality of connecting holes located at the connecting groove. A resistance rod matching the rack is slidably connected in the connecting hole. The length of the resistance rod is greater than the thickness of the pile column. When the reinforcing plate is passed through the connecting groove, the resistance rod is opposite to the rack.

[0019] By adopting the above technical solution, when lowering the inner core, the pile column is lowered first, then the reinforcing plate is lowered, and then the steel cage is lowered, and finally concrete is poured into the pile column. When lowering the steel cage, the steel cage resists the resistance rod, presses the resistance rod out, and the resistance rod squeezes the rack, and then drives the connecting rod to extend through the threaded cylinder, which is convenient to use.

[0020] Preferably, a resistance spring connected to the resistance rod is provided in the connection hole, and when the resistance spring is in a natural state, one end of the resistance rod away from the connection plate extends into the inner circle of the pile column.

[0021] By adopting the above technical solution, the resistance spring limits the initial position of the resistance rod, thereby preventing the outer end of the resistance rod from extending into the connecting groove and affecting the installation of the reinforcing plate.

[0022] Preferably, the connecting rod is hollow.

[0023] By adopting the above technical solution, after the connecting rod is inserted into the slurry discharge hole, the concrete in the outer pile can be poured into the connecting rod, thereby increasing the connection strength between the outer pile and the reinforcement plate.

[0024] Another object of the present application is to provide a construction method for a double-core rigid composite pile, which adopts the following technical solution: A construction method of a double inner core rigid composite pile, using the above double inner core rigid composite pile, comprises the following steps: S1. Measure and place pile positions; S2, slurry preparation, mixing to make concrete slurry; S3, mixing and spraying the grout and drilling to form a pile hole, and pouring concrete slurry to make an external pile when withdrawing the rod; S4, inserting piles, inserting the piles of the tubular piles into the outer piles in sequence, and making the connecting plates outside the piles correspond to each other; S5. Insert the reinforcing plate, insert the two ends of the reinforcing plate into the connecting grooves of the connecting plate respectively, the racks correspond to the abutment rods one by one, and the connecting rods correspond to the slurry discharge holes one by one; S6. Lower the steel cage and put it into the inner core of the pile column. The steel cage squeezes the contact rod. The outer end of the contact rod extends out of the outer wall of the pile column to contact the rack. The rack drives the threaded barrel to rotate. The threaded barrel drives the two connecting rods to extend and insert into the slurry discharge hole. S7. Grouting: pour concrete into the pile to form an inner core.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: The inner core is provided with multiple piles, which increases the contact area between the inner core and the outer pile and improves the overall bearing capacity; The inner cores are connected to each other through a reinforcing plate, so as to improve the connection strength between the inner cores and improve the stability of the inner cores. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of the overall structure of the first embodiment; Figure 2 is a schematic diagram of the overall structure of the second embodiment; Figure 3is a schematic diagram of the connection between the pile column and the connecting plate in the second embodiment; Figure 4 It is a schematic diagram of the connection between the abutment rod and the reinforcing plate in the second embodiment.

[0027] Description of reference numerals: 1. Outer pile; 2. Inner core; 21. Pile column; 22. Steel cage; 23. Connection hole; 24. Resistance rod; 25. Resistance spring; 3. Reinforcement plate; 31. Connection rod; 32. Threaded tube; 33. Rack; 34. Gear ring; 4. Connection plate; 41. Connection groove; 42. Discharge gap; 43. Discharge hole. DETAILED DESCRIPTION

[0028] The present application is further described in detail below in conjunction with all the accompanying drawings.

[0029] Embodiment 1

[0030] The present application embodiment discloses a double inner core stiff composite pile, referring to Figure 1 , including an outer pile 1 and an inner core 2, wherein at least two inner cores 2 are provided, and preferably, in this embodiment, two inner cores 2 are provided. The outer pile 1 is made of concrete, and the cross section of the outer pile 1 is square or "8" shaped. The inner core 2 includes a cylindrical pile column 21 and a steel cage 22 inserted in the pile column 21, and the inner circle of the pile column 21 is poured with concrete.

[0031] The two inner cores 2 increase the contact area with the outer pile 1, improve the structural strength of the whole structure, and thus increase the bearing capacity.

[0032] Embodiment 2

[0033] The difference between the second embodiment and the first embodiment is that the connection between the inner core 2 and the inner core 2 is different: Figure 2 and Figure 3 The inner cores 2 are connected to each other through a reinforcing plate 3.

[0034] Reference Figure 2 and Figure 3 The outer wall of the pile column 21 is linearly integrally formed with a plurality of connecting plates 4 along the vertical direction, and a vertical connecting groove 41 is provided in the center of the connecting plate 4. The connecting plates 4 are evenly fixed to the outer wall of the pile column 21, and a discharge gap 42 is formed between the connecting plates 4 and the connecting plates 4. The connecting plate 4 is provided with a plurality of horizontally arranged slurry discharge holes 43.

[0035] Reference Figure 2 and Figure 3 During installation, the connecting plates 4 of the two inner cores 2 face each other, and the two ends of the reinforcing plate 3 are respectively inserted into the connecting grooves 41 of the two connecting plates 4. During the insertion of the connecting plates 4, the concrete filled into the connecting grooves 41 by the outer pile 1 is squeezed out from the discharge gap 42 and the slurry discharge hole 43 by the reinforcing plate 3.

[0036] Reference Figures 2 to 4 A rack 33 is horizontally slidably connected in the reinforcing plate 3 along the radial direction of the pile column 21, and a threaded barrel 32 is rotatably connected in the reinforcing plate 3. A gear ring 34 meshing with the rack 33 is provided on the outer wall of the threaded barrel 32, and a bidirectional thread is provided on the inner wall of the threaded barrel 32. The axis of the threaded barrel 32 is horizontally arranged.

[0037] Reference Figures 2 to 4 Two hollow connecting rods 31 are respectively threadedly connected at both ends of the threaded barrel 32. When the threaded barrel 32 rotates, the two connecting rods 31 move synchronously toward or away from each other. Moreover, when the rack 33 moves toward the threaded barrel 32, the two connecting rods 31 move away from each other until the ends of the two connecting rods 31 extend from the side wall of the reinforcing plate 3 and are inserted into the slurry discharge hole 43, thereby connecting the reinforcing plate 3 and the connecting plate 4 to enhance the connection strength between the two. In addition, the concrete of the outer pile 1 can be poured into the connecting rod 31, thereby enhancing the connection strength between the reinforcing plate 3 and the outer pile 1.

[0038] Reference Figures 2 to 4 A connection hole 23 located in the connection groove 41 is provided in the pile column 21 along the radial direction of the pile column 21, and a resistance rod 24 is slidably connected in the connection hole 23. The length of the resistance rod 24 is greater than the thickness of the pile column 21. A resistance spring 25 connected to the resistance rod 24 is provided in the connection hole 23. When the resistance spring 25 is in a natural state, one end of the resistance rod 24 away from the connection plate 4 extends into the inner circle of the pile column 21, and the other end of the resistance rod 24 does not protrude from the outer wall of the pile column 21, which is convenient for the installation of the reinforcing plate 3.

[0039] Reference Figures 2 to 4 When the reinforcing plate 3 is inserted into the connecting groove 41, the connecting hole 23 is directly opposite to the abutment rod 24. When the steel cage 22 is installed, the steel cage 22 squeezes the abutment rod 24 and presses the abutment rod 24 out of the inner circle of the pile 21. The other end of the abutment rod 24 extends from the outer wall of the pile 21 and squeezes the rack 33, so that the rack 33 moves toward the threaded tube 32, so that the connecting rod 31 is inserted into the slurry discharge hole 43, which is convenient and quick to use. The end of the abutment rod 24 facing the steel cage 22 is tapered to facilitate the squeezing of the steel cage 22.

[0040] The implementation principle of a double-core rigid composite pile in an embodiment of the present application is as follows: the two inner cores 2 are connected by a reinforcing plate 3, and in the process of lowering the steel cage 22, the connecting rod 31 automatically extends out and is inserted into the slurry discharge hole 43, thereby connecting the reinforcing plate 3, the inner core 2 and the outer pile 1. No additional operating steps are required, the use is simple, and the overall structural strength is high and the bearing capacity is strong.

[0041] Embodiment 3

[0042] The present application embodiment discloses a construction method of a double inner core rigid composite pile, using a double inner core rigid composite pile of the above embodiment, comprising the following steps: S1. Measure and lay out the pile positions, use a total station to measure and lay out, and mark them with bamboo sticks and lime powder; S2, slurry preparation, mixing and making concrete slurry, the time between slurry preparation and grouting shall not exceed 1 hour; S3, mixing and spraying the grout and drilling to form a pile hole, and pouring concrete slurry to make an external pile when withdrawing the rod; S4, inserting the piles, inserting the two piles of the cylindrical pile into the outer piles in sequence, and making the connecting plates outside the piles correspond to each other; S5. Insert the reinforcing plate, insert the two ends of the reinforcing plate into the connecting grooves of the connecting plate respectively, the racks correspond to the abutment rods one by one, and the connecting rods correspond to the slurry discharge holes one by one; S6. Lower the steel cage and put it into the inner core of the pile column. The steel cage squeezes the contact rod. The outer end of the contact rod extends out of the outer wall of the pile column to contact the rack. The rack drives the threaded barrel to rotate. The threaded barrel drives the two connecting rods to extend and insert into the slurry discharge hole. S7. Grouting: pour concrete into the pile to form an inner core.

[0043] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A double inner core rigid composite pile, comprising an outer pile (1) and an inner core (2), characterized in that: At least two inner cores (2) are provided, and the inner cores (2) are evenly arranged inside the outer pile (1).

2. A double inner core rigid composite pile according to claim 1, characterized in that: A reinforcing plate (3) is connected between the inner cores (2), a connecting plate (4) is fixed to the outer wall of the inner core (2), the connecting plate (4) is fixed to the outer wall of the inner core (2) along the axial direction of the inner core (2), a connecting groove (41) is provided on the connecting plate (4), and two sides of the reinforcing plate (3) are respectively vertically inserted into the connecting grooves (41) of the two connecting plates (4).

3. A double inner core rigid composite pile according to claim 2, characterized in that: The connecting plates (4) are provided in a plurality and are linearly fixed to the outer wall of the inner core (2). The connecting plates (4) are evenly fixed to the outer wall of the inner core (2), and a discharge gap (42) is formed between the connecting plates (4).

4. A double inner core rigid composite pile according to claim 2, characterized in that: The connecting plate (4) is provided with a plurality of horizontally arranged pulp discharge holes (43).

5. A double inner core rigid composite pile according to claim 4, characterized in that: The reinforcing plate (3) is provided with a plurality of connecting rods (31) corresponding one to one with the slurry discharge holes (43), and the connecting rods (31) are inserted into the slurry discharge holes (43).

6. A double inner core rigid composite pile according to claim 5, characterized in that: The connecting rod (31) is horizontally slidably connected to the reinforcing plate (3), a threaded barrel (32) is rotatably connected to the reinforcing plate (3), the inner wall of the threaded barrel (32) is provided with a bidirectional thread, the outer wall of the connecting rod (31) is provided with an external thread threadedly connected to the threaded barrel (32), two connecting rods (31) are provided, and the two connecting rods (31) are respectively threadedly connected to the two ends of the threaded barrel (32), a rack (33) is slidably connected to the reinforcing plate (3), and the outer wall of the threaded barrel (32) is provided with a gear ring (34) meshing with the rack (33).

7. A double inner core rigid composite pile according to claim 6, characterized in that: The inner core (2) comprises a pile column (21) arranged in a cylindrical shape, a steel cage (22) inserted into the pile column (21), and concrete poured into the pile column (21); the connecting plate (4) is integrally formed and connected to the pile column (21); a plurality of connecting holes (23) located at the connecting groove (41) are opened on the pile column (21); a resistance rod (24) matched with the rack (33) is slidably connected in the connecting hole (23); the length of the resistance rod (24) is greater than the thickness of the pile column (21); when the reinforcing plate (3) is inserted into the connecting groove (41), the resistance rod (24) is directly opposite to the rack (33).

8. A double inner core rigid composite pile according to claim 7, characterized in that: A resisting spring (25) connected to a resisting rod (24) is arranged in the connection hole (23); when the resisting spring (25) is in a natural state, one end of the resisting rod (24) away from the connection plate (4) extends into the inner circle of the pile column (21).

9. The double inner core rigid composite pile according to claim 5, characterized in that: The connecting rod (31) is hollow.

10. A construction method of a double inner core rigid composite pile, using a double inner core rigid composite pile as claimed in any one of claims 1 to 9, characterized in that: The following steps are included: S1. Measure and place pile positions; S2, slurry preparation, mixing to make concrete slurry; S3, mixing and spraying the grout and drilling to form a pile hole, and pouring concrete slurry to make an external pile when withdrawing the rod; S4, inserting piles, inserting the piles of the tubular piles into the outer piles in sequence, and making the connecting plates outside the piles correspond to each other; S5. Insert the reinforcing plate, insert the two ends of the reinforcing plate into the connecting grooves of the connecting plate respectively, the racks correspond to the abutment rods one by one, and the connecting rods correspond to the slurry discharge holes one by one; S6. Lower the steel cage and put it into the inner core of the pile column. The steel cage squeezes the contact rod. The outer end of the contact rod extends out of the outer wall of the pile column to contact the rack. The rack drives the threaded barrel to rotate. The threaded barrel drives the two connecting rods to extend and insert into the slurry discharge hole. S7. Grouting: pour concrete into the pile to form an inner core.

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