A pile-soil load regulator for composite pile foundation

Abstract

The present invention discloses a pile-soil load regulator for a composite pile foundation, which comprises an upper end plate, a lower end plate, an upper casing, a lower casing and an angled plate; the two ends of the angled plate are respectively connected to the bottom of the upper end plate and the top of the lower end plate; the upper casing is installed on the lower end surface of the upper end plate; the lower casing is installed on the upper end surface of the lower end plate; when in use, the load regulator of the present invention is installed between the base and the pile top of the end bearing pile, and the load regulator is provided with an angled plate, the angled plate has a certain deformation angle, and the compressive deformation direction of the angled plate is controllable, so the compressive deformation curve of the load regulator is stable and accurate, and when the composite pile foundation is designed and calculated by the established compressive deformation curve of the load regulator, by effectively controlling the vertical load on the pile top, the design idea is clear, the force is clear, and the pile-soil sharing ratio can be effectively adjusted, so that the accuracy of the calculation can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of composite pile foundations of non-soft soil foundations, and in particular to a pile-soil load regulator for composite pile foundations. Background Art

[0002] Pile foundations usually include conventional pile foundations and composite pile foundations. When designing and calculating conventional pile foundations, the bearing capacity of a single pile is taken as a characteristic value or a design value, and the bearing capacity of the soil around the pile is not considered. The load of the superstructure is borne entirely by the piles. Composite pile foundations are a sparsely arranged pile foundation form that can fully utilize the bearing capacity of the soil around the piles. Compared with conventional pile foundations, the amount of piles used in the project is greatly reduced, which can greatly save cost investment.

[0003] The existing composite pile foundation usually installs a load adjuster between the cap and the pile top of the end bearing pile. When the upper load acting on the cap is small, the load adjuster and the soil around the pile begin to bear force at the same time. Since the stiffness of the load adjuster is much greater than the stiffness of the soil around the pile, the bearing capacity of the soil around the pile can be ignored. At this time, the load adjuster bears the upper load; when the upper load reaches the adjustment tonnage of the load adjuster, the load adjuster begins to be compressed and deformed together with the soil around the pile. At this time, the stiffness of the load adjuster is at a small level, and the load adjuster no longer bears the extra load. The load regulator is designed to coordinate deformation with the soil around the pile, and the increased load will be borne by the soil around the pile, so as to achieve the purpose of the pile-soil interaction; when the load regulator reaches the predetermined deformation, the stiffness of the load regulator is restored to the initial stiffness through the limit device on it, and the load regulator stops working. Then, the load regulator becomes a part of the end-bearing pile through secondary grouting. The vertical stiffness of the end-bearing pile is extremely large, far greater than the stiffness of the soil around the pile, and the bearing capacity of the soil around the pile can be ignored, that is, the soil around the pile no longer plays a role and stops working, and the subsequent increased upper load is borne by the end-bearing pile. The load regulator achieves the dual adjustment effect through coordinated deformation and secondary grouting.

[0004] Therefore, in the design and calculation of existing composite pile foundations, the established compression deformation curve of the load regulator is mainly used as the basis, thereby replacing the deformation calculation of the soil body, avoiding the calculation error caused by the complexity and uncertainty of the soil body, and more accurately designing the bearing ratio of the soil around the pile and the end-bearing pile under the upper load, and then accurately calculating the bearing capacity of the composite pile foundation.

[0005] However, it is found through observation that the compressive deformation of the existing load regulator is torsional bending deformation, which is still an uncertain deformation. The compressive deformation curve of the load regulator has uncertainty, resulting in large errors in the design and calculation of the composite pile foundation.

[0006] In view of this, the inventor has made in-depth considerations and actively researched, improved and tried to develop and design the present invention in order to solve the many deficiencies and inconveniences caused by the imperfect bearing capacity calculation design in the above-mentioned composite pile foundation. Summary of the invention

[0007] The object of the present invention is to provide a pile-soil load regulator for a composite pile foundation, so as to accurately calculate the bearing capacity of the composite pile foundation.

[0008] In order to achieve the above object, the solution of the present invention is:

[0009] A pile-soil load regulator for a composite pile foundation comprises an upper end plate, a lower end plate, an upper casing, a lower casing and an angled plate; the two ends of the angled plate are respectively connected to the bottom of the upper end plate and the top of the lower end plate; the upper casing is installed on the lower end surface of the upper end plate; and the lower casing is installed on the upper end surface of the lower end plate.

[0010] The load regulator is provided with multiple groups of angled plates, wherein two ends of one group of angled plates are respectively connected to the center of the upper end plate and the lower end plate, and the remaining groups of angled plates are arranged around the group of angled plates and are evenly distributed on the circumference.

[0011] Stiffening plates are respectively provided at the angles between the angled plate and the upper end plate and the lower end plate.

[0012] The sizes of the upper casing and the lower casing are proportional, and the upper casing is sleeved on the lower casing.

[0013] The cross sections of the upper casing and the lower casing are both rectangular.

[0014] Anchor holes are provided on the upper end plate and the lower end plate.

[0015] After adopting the above scheme, when in use, the load adjuster of the present invention is installed between the base and the pile top of the end bearing pile. The load adjuster is provided with an angled plate, and the angled plate has a certain deformation angle. The compressive deformation direction of the angled plate is controllable, so the compressive deformation curve of the load adjuster is stable and accurate. When the composite pile foundation is designed and calculated by the established compressive deformation curve of the load adjuster, the accuracy of the calculation can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the first embodiment of the present invention;

[0017] Figure 2 for Figure 1 Cross-sectional view of the middle AA section;

[0018] Figure 3 This is a usage state diagram of the first embodiment of the present invention;

[0019] Figure 4 A cross-sectional view of a second embodiment of the present invention. DETAILED DESCRIPTION

[0020] In order to further explain the technical solution of the present invention, the present invention is described in detail below through specific embodiments.

[0021] like Figures 1 to 3 As shown, a first embodiment of a pile-soil load regulator for a composite pile foundation of the present invention comprises an upper end plate 11, a lower end plate 12, an upper casing 13, a lower casing 14 and at least one group of angled plates 15; the two ends of the angled plates 15 are respectively connected to the bottom of the upper end plate 11 and the top of the lower end plate 12; the upper casing 13 is installed on the lower end surface of the upper end plate 11; and the lower casing 14 is installed on the upper end surface of the lower end plate 12.

[0022] When in use, the load adjuster 1 of the present invention is installed between the base 2 and the pile top of the end bearing pile 3. The load adjuster 1 is provided with an angled plate 15. The angled plate 15 has a certain deformation angle, and the compressive deformation direction of the angled plate 15 is controllable. Therefore, the compressive deformation curve of the load adjuster 1 is stable and accurate. When the composite pile foundation is designed and calculated by the established compressive deformation curve of the load adjuster 1, the accuracy of the calculation can be improved.

[0023] Stiffening plates 16 are respectively provided at the angles between the above-mentioned angled plate 15 and the upper end plate 11 and the lower end plate 12. By providing the stiffening plates 16, the strength and stability of the structure of the load adjuster 1 are enhanced.

[0024] The sizes of the upper and lower casings 13 and 14 are proportional, and the upper casing 13 is sleeved on the lower casing 14. After the load adjuster 1 is compressed and deformed, the position where the upper casing 13 presses against the lower end plate 12 is close to the lower casing 14, and the position where the lower casing 14 presses against the upper end plate 11 is close to the upper casing 13, which is conducive to enhancing the strength and stability of the upper and lower casings 13 and 14 supporting the upper end plate 11. In addition, the cross-sections of the upper and lower casings 13 and 14 are both rectangular. By setting the cross-sections of the upper and lower casings 13 and 14 to be rectangular, it is convenient to install the angled plate 15.

[0025] The upper end plate 11 and the lower end plate 12 are both provided with anchor holes 17. By providing the anchor holes 17, the upper end plate 11 of the load adjuster 1 can be fixedly connected to the bottom of the cap 2, and the lower end plate 12 of the load adjuster 1 can be fixedly connected to the top of the end bearing pile 3.

[0026] like Figure 4As shown, it is a second embodiment of a pile-soil load regulator for composite pile foundation of the present invention. The difference between this embodiment and the first embodiment is that: in this embodiment, the load regulator 1 is provided with seven groups of angled plates 15, wherein the two ends of one group of angled plates 15 are respectively connected to the center of the upper end plate 11 and the lower end plate 12, and the remaining groups of angled plates 15 are arranged around the group of angled plates 15 and are evenly distributed on the circumference. The number of angled plates 15 is determined according to the tonnage that the load regulator 1 needs to adjust, which can be eight groups, nine groups, etc. Moreover, the angled plates 15 are arranged around and evenly distributed on the circumference, so that the compression deformation curve of the load regulator 1 is stable and accurate.

[0027] The above description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is obvious that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that ordinary technicians in the field can realize and use various different exemplary embodiments of the present invention and various different selections and changes. Any appropriate changes or modifications made by ordinary technicians in the field of technology should be regarded as not departing from the patent scope of the present invention.

Claims

1. A pile-soil load regulator for a composite pile foundation, characterized in that: It includes an upper end plate, a lower end plate, an upper protective tube, a lower protective tube and at least one group of angled plates; the two ends of the angled plates are respectively connected to the bottom of the upper end plate and the top of the lower end plate, and the angled plates have a deformation angle; the upper protective tube is installed on the lower end surface of the upper end plate; the lower protective tube is installed on the upper end surface of the lower end plate; stiffening plates are respectively provided at the angles between the angled plates and the upper end plate and the lower end plate; anchor holes are provided on both the upper end plate and the lower end plate.

2. A pile-soil load regulator for a composite pile foundation as claimed in claim 1, characterized in that: The load regulator is provided with multiple groups of angled plates, wherein two ends of one group of angled plates are respectively connected to the center of the upper end plate and the lower end plate, and the remaining groups of angled plates are arranged around the group of angled plates and are evenly distributed on the circumference.

3. A pile-soil load regulator for a composite pile foundation as claimed in claim 1, characterized in that: The sizes of the upper casing and the lower casing are proportional, and the upper casing is sleeved on the lower casing.

4. A pile-soil load regulator for a composite pile foundation as claimed in claim 1, characterized in that: The cross sections of the upper casing and the lower casing are both rectangular.

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