A device for improving the axial bearing capacity of a pile segment embedded in a steel cage

Abstract

A device for improving the axial bearing capacity of a pile segment embedded in a steel cage comprises a steel cage, wherein the steel cage is provided with a plurality of groups of symmetrical anchor arm holes, a hydraulic cylinder is installed in the anchor arm holes, a hydraulic chamber is provided in the hydraulic cylinder, two piston top plates are provided in the hydraulic chamber, the outer sides of the two piston top plates are connected to one end of an anchor arm rod, an anchor arm tip is installed at the other end of the anchor arm rod, the hydraulic chamber is connected to a hydraulic pump through an upper hydraulic pipe and a lower hydraulic pipe respectively, and the pipe openings of the upper hydraulic pipe and the lower hydraulic pipe are located between the two piston top plates. In the pile segment of the present invention, a plurality of anchor arms can be arranged along the pile axis, and an effective effect of improving the axial bearing capacity of multiple pile segments can be achieved; a grouting hole is provided at the top of the anchor arm to solidify the soil gaps and local strength weakening caused by the top-out construction, and further enhance the axial bearing capacity of the pile top; a stroke measuring device is installed in the anchor arm tip to monitor the actual top-out stroke of the anchor arm and accurately control the construction quality.

Description

Technical Field

[0001] The invention relates to the technical field of foundation engineering, and in particular to a device for improving the axial bearing capacity of a pile segment embedded in a steel cage. Background Art

[0002] Pile foundations are widely used in construction and transportation projects. To ensure the safety of the project, the axial bearing performance of the pile foundation needs to be optimized in the engineering design. At the same time, in order to accurately evaluate the vertical bearing capacity of the engineering piles, it is necessary to carry out on-site testing of the pile foundation bearing capacity. The widely used pile foundation bearing capacity self-balancing test method is difficult to accurately determine the self-balancing point, which affects the accurate measurement of the bearing capacity of the upper and lower pile sections. The above problems in real projects have caused difficulties in the design of pile foundation projects.

[0003] Common measures to improve the axial bearing capacity of pile foundations are often only aimed at the diameter and length of the pile foundation. Changes in the above two dimensions often involve changes in the entire length of the pile foundation, which has a significant impact on the project cost, especially for super-long piles. At present, the determination of the self-balancing point mostly relies on empirical calculation methods. Due to the complexity of the actual strata, although scholars in related fields have conducted extensive research on this, there are many differences in the axial bearing capacity of the upper and lower pile sections of the load box. In actual operation, only the bearing capacity of one of the pile sections can be measured. It is urgent to find measures to increase the bearing capacity after a certain pile section reaches its ultimate bearing capacity, in order to achieve the determination of the bearing capacity of another pile section. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] The purpose of the present invention is to provide a method to solve the practical problems raised in the above background technology.

[0006] (II) Technical solution

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a device for improving the axial bearing capacity of a pile segment embedded in a steel cage, comprising a steel cage, wherein the steel cage is provided with a plurality of groups of symmetrical anchor arm holes, a hydraulic cylinder is installed in the anchor arm holes, a hydraulic chamber is provided in the hydraulic cylinder, two piston top plates are provided in the hydraulic chamber, the outer sides of the two piston top plates are connected to one end of an anchor arm rod, an anchor arm tip is installed at the other end of the anchor arm rod, the hydraulic chamber is connected to a hydraulic pump via an upper hydraulic pipe and a lower hydraulic pipe respectively, and the pipe openings of the upper hydraulic pipe and the lower hydraulic pipe are located between the two piston top plates.

[0008] Furthermore, grouting ports are provided at the upper and lower ends of the anchor arm hole, and the grouting port at the upper end and the grouting port at the lower end are connected to a grouting pump through an upper grouting pipe and a lower grouting pipe, respectively.

[0009] Furthermore, a displacement metering device is installed on the tip of the anchor arm.

[0010] Furthermore, the displacement metering device includes a stroke line, one end of which is connected to the anchor arm tip, and the other end of which is connected to a meter wheel after passing through a fixed pulley installed on the hydraulic cylinder, and a photoelectric encoder is installed on the meter wheel.

[0011] Furthermore, the hydraulic cylinder is made of steel.

[0012] (III) Beneficial effects

[0013] In the pile section of the present invention, multiple anchor arms can be arranged along the pile axis, which can achieve an effective effect of improving the axial bearing capacity of multiple pile sections; grouting holes are provided at the top of the anchor arms to solidify the soil gaps and local strength weakening caused by the top-out construction, thereby further enhancing the axial bearing capacity of the pile top; a stroke measuring device is installed in the tip of the anchor arm to monitor the actual top-out stroke of the anchor arm and accurately control the construction quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 A top view of the present invention;

[0017] Figure 3 It is a side view of the present invention;

[0018] Figure 4 It is a side view of the hydraulic cylinder of the present invention.

[0019] Legend:

[0020] Rebar cage 1, anchor arm tip 2, photoelectric encoder 3, upper grouting pipe 4, lower grouting pipe 5, stroke line 6, fixed pulley 7, anchor arm rod 8, piston top plate 9, hydraulic chamber 10, upper hydraulic pipe 11, lower hydraulic pipe 12, hydraulic pump 13, meter wheel 14, grouting pump 15, hydraulic cylinder 16, slurry-soil consolidation area 17. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] See also Figure 1-4 The present invention provides a technical solution: a pile segment axial bearing capacity lifting device embedded in a steel cage, comprising a steel cage 1, a plurality of symmetrical anchor arm holes are arranged on the steel cage 1, a hydraulic cylinder 16 is installed in the anchor arm hole, a hydraulic chamber 10 is arranged in the hydraulic cylinder 16, two piston top plates 9 are arranged in the hydraulic chamber 10, the outer sides of the two piston top plates 9 are connected to one end of an anchor arm rod 8, an anchor arm tip 2 is installed at the other end of the anchor arm rod 8, the anchor arm rod 8 is slidably connected to the hydraulic cylinder 16, the cross-sectional diameter of the anchor arm tip 2 is larger than the cross-sectional diameter of the anchor arm rod 8, and has a limiting effect, and the hydraulic chamber 10 is respectively connected to the upper hydraulic pipe 11 and the lower hydraulic pipe 12. The pipe 12 is connected to the hydraulic pump 13, and the pipe openings of the upper hydraulic pipe 11 and the lower hydraulic pipe 12 are located between the two piston top plates 9; grouting ports are also provided at the upper and lower ends of the anchor arm hole, and the upper grouting port and the lower grouting port are connected to the grouting pump 15 through the upper grouting pipe 4 and the lower grouting pipe 5 respectively; a displacement metering device is installed on the anchor arm tip 2; the displacement metering device includes a stroke line 6, one end of the stroke line 6 is connected to the anchor arm tip 2, and the other end of the stroke line 6 is connected to the meter wheel 14 after passing through the fixed pulley 7 installed on the hydraulic cylinder 16, and the meter wheel 14 is installed with a photoelectric encoder 3; the hydraulic cylinder 16 is made of steel.

[0023] Working principle of the present invention: before pouring concrete into the steel cage 1, in order to improve the axial bearing capacity of the pile section after pouring, the present invention is provided with a plurality of ejection devices in the steel cage 1, and the hydraulic pump 13 is controlled to input hydraulic pressure into the hydraulic chamber 10 so that the two anchor arms 8 are respectively ejected outward, and then the grouting pump 15 is controlled to grout the ejection points of the anchor arms 8 and the soil layer, so that the anchor arms 8 and the surrounding soil layer are solidified, which can improve the vertical resistance of the pile section and the soil layer, thereby improving the axial bearing capacity of the anchor arms 8. One end of the stroke line 6 is connected to the anchor arm tip 2. When the anchor arm tip 2 is displaced and ejected, the stroke line 6 will drive the meter wheel 14 to rotate. The meter wheel 11 is provided with a photoelectric encoder 10. The photoelectric encoder 10 measures the number of revolutions of the meter wheel 11, thereby accurately calculating the ejection displacement of the anchor arm 8.

[0024] Various aspects of the present invention are described in this disclosure with reference to the accompanying drawings, in which many illustrative embodiments are shown. The embodiments of the present disclosure are not necessarily defined to include all aspects of the present invention. It should be understood that the various concepts and embodiments introduced above, as well as those described in more detail below, can be implemented in any of many ways, because the concepts and embodiments disclosed by the present invention are not limited to any implementation. In addition, some aspects disclosed by the present invention can be used alone, or in any appropriate combination with other aspects disclosed by the present invention.

[0025] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A device for improving the axial bearing capacity of a pile segment embedded in a steel cage, comprising a steel cage (1), characterized in that: The steel cage (1) is provided with a plurality of groups of symmetrical anchor arm holes, a hydraulic cylinder (16) is installed in the anchor arm hole, a hydraulic chamber (10) is provided in the hydraulic cylinder (16), two piston top plates (9) are provided in the hydraulic chamber (10), the outer sides of the two piston top plates (9) are connected to one end of the anchor arm rod (8), the other end of the anchor arm rod (8) is installed with an anchor arm tip (2), the hydraulic chamber (10) is connected to a hydraulic pump (13) via an upper hydraulic pipe (11) and a lower hydraulic pipe (12), and the pipe openings of the upper hydraulic pipe (11) and the lower hydraulic pipe (12) are located between the two piston top plates (9); A displacement metering device is installed on the anchor arm tip (2); The displacement metering device comprises a travel line (6), one end of which is connected to the anchor arm tip (2), and the other end of which is connected to a meter wheel (14) after passing through a fixed pulley (7) mounted on the hydraulic cylinder (16), and a photoelectric encoder (3) is mounted on the meter wheel (14); The hydraulic cylinder (16) is made of steel.

2. The device for improving the axial bearing capacity of a pile segment embedded in a steel cage according to claim 1, characterized in that: Grouting ports are also provided at the upper and lower ends of the anchor arm hole, and the upper grouting port and the lower grouting port are connected to a grouting pump (15) through an upper grouting pipe (4) and a lower grouting pipe (5) respectively.

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