A precast tubular pile support structure of a large diameter cylinder without a bottom
By designing prestressed pipe pile groups and composite bearing layers, the problems of high cost and ecological damage in the prefabrication process of bottomless large cylinders were solved, achieving efficient and stable prefabrication of bottomless large cylinders and improving foundation stability and construction accuracy.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CNADC GUANGZHOU HARBOR ENG CO
- Filing Date
- 2025-08-07
- Publication Date
- 2026-07-03
Smart Images
Figure CN224451606U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of port engineering, and specifically designs a precast pipe pile support structure with a bottomless large cylindrical tube. Background Technology
[0002] Bottomless large cylindrical structures need to be prefabricated on land and then transported to the dock. The traditional method of prefabricating large cylindrical structures using temporary steel bottom molds has the following problems:
[0003] High cost: The prefabrication of large cylinders is mostly located far from the port, resulting in high rental costs for secondary transshipment equipment;
[0004] Low precision: Deformation of the steel bottom mold leads to deviation in the ellipticity of the cylinder. During repeated use, the steel bottom mold deforms due to the large weight supported by the large cylinder. If it is not replaced in time or deformed during use, it will cause deviation in the ellipticity of the cylinder.
[0005] Ecological damage: Heavy vehicles crush the vegetation along the riverbank, damaging the stability of the riverbank. Utility Model Content
[0006] In order to solve the above-mentioned problems in the existing technology, the purpose of this utility model is to provide a prefabricated pipe pile support structure with a bottomless large cylindrical tube.
[0007] The technical solution adopted in this utility model includes:
[0008] The prestressed pipe pile group consists of multiple PHC pipe piles evenly distributed along the circumference of the bottom surface of the cylinder;
[0009] The pile top connection system includes a steel reinforcement support beam connecting the upper ends of adjacent PHC pipe piles, and a ring-shaped steel reinforcement skeleton connecting the top of the PHC pipe piles.
[0010] The composite bearing layer is formed by integrally casting concrete to wrap the pile top connection system. Its top surface forms an annular support surface adapted to the curvature of the cylinder. An elastic buffer pad layer is laid inside the annular support surface. A square drainage cavity is provided in the central area of the composite bearing layer. The drainage cavity is filled with permeable filler.
[0011] An anti-deformation structure is provided inside the drainage cavity, and a grid skeleton composed of concrete ribs is used to divide the drainage cavity into multiple independent drainage units.
[0012] As a preferred embodiment of this invention, the tops of the multiple PHC pipe piles are located on the same horizontal reference plane.
[0013] As a preferred embodiment of this utility model, the steel reinforcement support beam and the annular steel reinforcement skeleton are respectively welded to the PHC pipe pile.
[0014] As a preferred embodiment of this invention, the outer radius of the annular support surface is equal to the outer radius of the bottomless large cylindrical wall.
[0015] As a preferred embodiment of this invention, the elastic buffer pad is a rubber pad.
[0016] As a preferred embodiment of this invention, the permeable filler is graded sand or crushed coral particles.
[0017] As a preferred embodiment of this invention, the concrete rib beam is a cross-shaped concrete rib beam.
[0018] As a preferred embodiment of this invention, each independent drainage unit is provided with a drainage blind pipe at its bottom, and the drainage blind pipe is connected to the external drainage system.
[0019] As a preferred embodiment of this invention, the cross-sectional height of the concrete rib beam is equal to the thickness of the composite load-bearing layer.
[0020] As a preferred embodiment of this utility model, the supporting structure is provided in multiple sets along the bank, and a gravel access road is formed between two adjacent sets of the supporting structure; gantry crane tracks are symmetrically provided on the composite bearing layer, and the axis of the gantry crane tracks is perpendicular to the axis of the gravel access road.
[0021] The beneficial effects of this utility model are as follows:
[0022] This utility model is a precast pipe pile support structure for a bottomless large cylindrical structure. By setting permanent PHC pipe pile foundations along the shore, it replaces the traditional temporary bottom formwork of steel structures, completely eliminating the land transportation link of the large cylindrical structure and saving equipment rental costs. A composite bearing layer is formed on the top of the PHC pipe pile, providing a precast plane for the large cylindrical structure, and an elastic buffer layer is formed on the plane to prevent demolding between the cylindrical structure and the composite bearing layer. The drainage cavity reinforced by cross ribs and filled with permeable sand / crushed coral accelerates the drainage of the foundation, controls the differential settlement, and improves the stability of the foundation by combining the stress of the pipe pile group. The pile top connection system enhances the horizontal rigidity and circumferential constraint through steel reinforcement support beams and a ring steel reinforcement skeleton to ensure overall stability. Attached Figure Description
[0023] The present invention will now be described in further detail with reference to the accompanying drawings and specific implementation methods.
[0024] Figure 1 This is a schematic diagram of the structure of this utility model;
[0025] Figure 2 This is a schematic diagram of the internal structure of this utility model.
[0026] Explanation of reference numerals in the attached figures:
[0027] 1. Prestressed pipe pile group; 11. PHC pipe piles;
[0028] 2. Pile top connection system; 21. Reinforced steel support beam; 22. Circular steel reinforcement cage;
[0029] 3 Composite bearing layer, 31 Elastic buffer pad layer, 32 Drainage cavity, 33 Permeable filler, 34 Crushed stone access road, 35 Gantry crane rail;
[0030] 4. Deformation-resistant structure, 41. Concrete rib beams;
[0031] 5. Bottomless large cylinder. Detailed Implementation
[0032] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model; that is, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The components of the embodiments of the present utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0034] The following is combined Figures 1-2 This invention describes a specific embodiment of a precast pipe pile support structure with a bottomless large cylindrical core, comprising:
[0035] Prestressed pipe pile group 1 consists of multiple high-strength prestressed high-strength concrete (PHC) pipe piles, which are evenly arranged along the circumference of the bottom of the bottomless large cylindrical tube 5. The spacing of the PHC pipe piles is determined by calculation based on geological conditions and bearing capacity requirements, and is usually 2.5 to 3.5 times the pile diameter. The PHC pipe piles adopt a strength grade of C80 or above, and the specific specifications are determined according to the design load.
[0036] The pile top connection system 2 includes a steel reinforcement support beam 21 connecting the upper ends of adjacent PHC pipe piles and an annular steel reinforcement skeleton 22 connecting the top of the PHC pipe piles. The support beam is firmly connected to the reserved steel reinforcement at the upper end of the adjacent PHC pipe piles by high-strength welding to enhance the horizontal rigidity of the pipe pile group and distribute local loads. The annular steel reinforcement skeleton 22 is welded to the reserved steel reinforcement at the top of the PHC pipe piles and is composed of longitudinal and circumferential steel reinforcement to form a closed circular skeleton, providing circumferential restraint and preventing lateral deformation of the pipe pile group. At the same time, it is located between the front and rear toes of the precast cylinder to improve the support strength during the precasting of the cylinder. The steel reinforcement support beam 21 and the annular steel reinforcement skeleton 22 are connected in upper and lower layers or at intersection.
[0037] The composite bearing layer 3 is formed by integrally casting concrete to enclose the pile top connection system 2. Its top surface forms an annular support surface adapted to the curvature of the cylinder. An elastic buffer pad 31 is laid inside the annular support surface. When the concrete of the pile top connection system 2 is cast, the annular support surface is made lower than the overall thickness of the composite bearing layer 3 by reserving a non-cast surface, thus providing installation space for the elastic buffer pad 31. When the large cylinder is prefabricated, the elastic buffer pad 31 can prevent the concrete of the large cylinder from bonding and solidifying with the top of the composite bearing layer 3. A square drainage cavity 32 is provided in the central area of the composite bearing layer 3. The drainage cavity 32 is filled with permeable filler to improve the permeability of the drainage cavity 32.
[0038] The deformation-resistant structure 4 is located inside the drainage cavity 32 and is composed of a grid skeleton formed by concrete rib beams 41 to divide the drainage cavity 32 into multiple independent drainage units.
[0039] Please refer to Figure 2 As shown, the tops of multiple PHC pipe piles are on the same horizontal reference plane. The tops of multiple PHC pipe piles are controlled to be on the same horizontal reference plane through precise measurement, with the deviation controlled within ±5mm, to ensure the overall stability of the structure.
[0040] Please refer to Figure 2 As shown, the steel reinforcement support beam 21 and the annular steel reinforcement skeleton 22 are respectively welded to the PHC pipe piles to enhance the horizontal rigidity of the pipe pile group, disperse local loads, and provide circumferential constraints to prevent lateral deformation of the pipe pile group.
[0041] Please refer to Figures 1-2 As shown, the outer radius of the annular support surface is equal to the outer radius of the bottomless large cylinder 5, so that the annular support surface provides a support surface for the prefabrication of the large cylinder, and the PHC pipe pile corresponds to the bottom position of the large cylinder.
[0042] Please refer to Figure 2 As shown, the elastic buffer pad 31 is a rubber pad block, which is fixed to the annular support surface by a special adhesive.
[0043] Please refer to Figure 1 As shown, the permeable filler is graded sand or crushed coral particles. The permeable filler 33 can be selected from graded sand (particle size 5-20mm) or crushed coral particles (particle size 3-15mm). The permeable filler has a porosity of 30%-40% to ensure good permeability in the drainage cavity 32. The permeable filler 33 can be distributed in multiple layers and compacted.
[0044] Please refer to Figure 2 As shown, the concrete rib beam 41 is a cross-shaped concrete rib beam 41, made of C40 concrete, with built-in steel bars to improve mechanical strength, thereby enhancing the shear and bending resistance of the composite bearing layer 3 and the inner circular surface of the annular support surface.
[0045] Please refer to Figure 2 As shown, each independent drainage unit is equipped with a drainage blind pipe at the bottom. The drainage blind pipe is connected to the external drainage system. The blind pipe is connected to the external drainage network through a special connector to ensure sealing and unobstructed flow, effectively preventing water accumulation inside the cylinder when prefabricating the large cylinder. By setting multiple independent drainage units, local water accumulation can be avoided.
[0046] Please refer to Figures 1-2 As shown, the cross-sectional height of the concrete rib beam 41 is equal to the thickness of the composite load-bearing layer 3.
[0047] Please refer to Figure 1 As shown, multiple sets of the supporting structures are provided along the bank, and a gravel access road 34 is formed between two adjacent sets of the supporting structures. The gravel access road 34 is laid in layers to facilitate the passage of construction vehicles and maintenance operations. A gantry crane rail 35 is symmetrically provided on the composite bearing layer 3. The axis of the gantry crane rail 35 is perpendicular to the axis of the gravel access road 34. The gantry crane rail 35 is used for the sliding of the gantry frame and for the hoisting or transfer of steel bars and construction components during the prefabrication of large cylinders.
[0048] Working principle of this utility model:
[0049] PHC pile groups were driven along the shoreline, ensuring that they were evenly distributed around the circumference of the large cylindrical ground.
[0050] Steel reinforcement support beams 21 are welded between adjacent PHC pipe piles driven along the shore to enhance the horizontal rigidity of the PHC pipe pile group and distribute local loads. At the same time, a ring steel reinforcement skeleton 22 is welded to the top of the PHC pipe pile.
[0051] The outer ring of the composite bearing layer 3 is formed by surrounding the PHC pipe pile group, and a square drainage cavity 32 is formed at the center of the PHC pipe pile group. The pouring space of the composite bearing layer 3 is formed between the outer ring and the square drainage cavity 32. Concrete is poured into this space and allowed to solidify to form the composite bearing layer 3. During the formation of the composite bearing layer 3, an annular support surface is reserved on its upper end for connecting the elastic buffer pad layer 31.
[0052] The elastic buffer layer 31 is used to provide support for the prefabrication of the large cylinder, and the large cylinder is prevented from bonding and solidifying between its bottom and the composite bearing layer 3 during prefabrication.
[0053] After the large cylinder is prefabricated, it is lifted and sunk in one go by a crane ship.
[0054] The pile top connection system 2 enhances horizontal rigidity and circumferential restraint through the steel reinforcement support beam 21 and the ring steel reinforcement skeleton 22, ensuring overall stability;
[0055] The composite bearing layer 3 evenly distributes the load to the pile top connection system 2. The annular support surface and the elastic buffer pad layer 31 are adapted to the large cylindrical curvature, reducing adhesion during pouring. The deformation-resistant structure 4 separates the drainage cavity 32 through concrete rib beams 41, enhancing its shear and bending resistance. The permeable filling material and blind pipe system in the drainage cavity 32 effectively remove accumulated water.
[0056] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0057] The above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the structure of the utility model or exceed the scope defined by the claims of this application, they should all fall within the protection scope of this utility model.
Claims
1. A precast pipe pile support structure with a bottomless large cylindrical core, characterized in that, include; The prestressed pipe pile group (1) consists of multiple PHC pipe piles evenly distributed along the circumference of the bottom surface of the cylinder; The pile top connection system (2) includes a steel support beam (21) connecting the upper end of the adjacent PHC pipe piles, and a ring steel skeleton (22) connecting the top of the PHC pipe piles. The composite bearing layer (3) is formed by integrally casting concrete to wrap the pile top connection system (2). Its top surface forms an annular support surface adapted to the curvature of the cylinder. An elastic buffer pad layer (31) is laid inside the annular support surface. A square drainage cavity (32) is provided in the central area of the composite bearing layer (3). The drainage cavity (32) is filled with permeable filling material. An anti-deformation structure (4) is provided in the drainage cavity (32), and a grid skeleton is formed by concrete rib beams (41) to divide the drainage cavity (32) into multiple independent drainage units.
2. A precast pile support structure of a bottomless large cylinder according to claim 1, characterized in that: The tops of the multiple PHC pipe piles are on the same horizontal reference plane.
3. A precast pile support structure of a bottomless large cylinder according to claim 2, characterized in that: The steel reinforcement support beam (21) and the annular steel reinforcement skeleton (22) are respectively welded to the PHC pipe pile.
4. A precast pile support structure of a bottomless large cylinder according to claim 1, characterized in that: The outer radius of the annular support surface is equal to the outer radius of the bottomless large cylinder (5).
5. A precast pile support structure of a bottomless large cylinder according to claim 1, characterized in that: The elastic buffer pad layer (31) is a rubber pad.
6. The precast pipe pile support structure of a bottomless large cylindrical tube according to claim 1, characterized in that: The permeable filler is graded sand or crushed coral particles.
7. A precast pile support structure of a bottomless large cylinder according to claim 1, characterized in that: The concrete rib (41) is a cross-shaped concrete rib (41).
8. A precast pile support structure of a bottomless large cylinder according to claim 7, characterized in that: Each independent drainage unit is equipped with a blind drain pipe at the bottom, which is connected to the external drainage system.
9. A precast pipe pile support structure for a bottomless large cylindrical tube according to claim 8, characterized in that: The cross-sectional height of the concrete rib beam (41) is equal to the thickness of the composite load-bearing layer (3).
10. A precast pile support structure of a bottomless large cylinder according to claim 1, characterized in that: Multiple sets of the supporting structures are provided along the bank, and a gravel access road (34) is formed between two adjacent sets of the supporting structures; gantry crane rails (35) are symmetrically provided on the composite bearing layer (3), and the axis of the gantry crane rails (35) is perpendicular to the axis of the gravel access road (34).