Loading test device for simulating complex combined load effect of uplift pile

Abstract

The utility model relates to a loading test device for simulating the complex combined load effect of an uplift pile, which comprises a frame, a test groove is arranged in the middle of the frame, test soil is arranged in the test groove, the uplift pile is inserted into the test soil, the upper part of the uplift pile extends out of the surface of the test soil, and a pile cap is arranged at the upper end of the uplift pile. The top of the pile cap is connected with a first steel wire rope traction end used for applying vertical loads, the left side of the pile cap is connected with a second steel wire rope traction end used for applying horizontal loads, and the right side of the upper portion of the uplift pile is connected with a third steel wire rope traction end used for applying oblique loads. And loading ends of the first steel wire rope, the second steel wire rope and the third steel wire rope are connected with loading grooves for placing weights. The loading test device is simple in structure, efficient and practical, combined loads in multiple directions can be applied at the same time, and the actual stress state and the bearing deformation characteristic of the uplift pile can be evaluated more comprehensively and truly.

Description

Technical Field

[0001] The utility model relates to the field of test devices, in particular to a loading test device for simulating the complex combined load action of an anti-pullout pile. Background Art

[0002] Pull-out piles are a type of pile foundation primarily designed to withstand uplift loads. They are widely used in applications such as anti-floating large basements, anti-uplift structures, anti-uplift offshore dock platforms, and anchor foundations for bridges. When used as foundations for tall structures such as transmission towers and offshore wind turbines, pull-out piles must withstand not only axial tensile loads, but also horizontal loads such as wind and waves transmitted from the superstructure, as well as the resulting bending moments. Existing engineering and research studies mostly consider only the bearing-deformation characteristics of piles under the influence of uplift loads, with limited research on the effects of horizontal loads and bending moments on the bearing capacity of pull-out piles. This can result in pile foundation designs in actual engineering applications failing to accurately reflect their performance in real-world environments, thus impacting the safety and reliability of the entire structure. Utility Model Content

[0003] In view of this, the purpose of the present invention is to provide a loading test device with a simple structure, high efficiency and practicality for simulating the complex combined load effects of pull-out piles, which can simultaneously apply combined loads in multiple directions and more comprehensively and realistically evaluate the actual stress state and bearing deformation characteristics of the pull-out piles.

[0004] The utility model is implemented by the following scheme: a loading test device for simulating the complex combined load action of a pull-out pile, comprising a frame, a test trough being provided in the middle of the frame, test soil being filled in the test trough, a pull-out pile being inserted in the test soil, the upper part of the pull-out pile extending out of the surface of the test soil, a pile cap being provided at the upper end of the pull-out pile, the top of the pile cap being connected to a first steel wire rope traction end for applying a vertical load, the left side of the pile cap being connected to a second steel wire rope traction end for applying a horizontal load, and the right side of the upper part of the pull-out pile being connected to a third steel wire rope traction end for applying an oblique load; the loading ends of the first steel wire rope, the second steel wire rope and the third steel wire rope are all connected to a loading trough for placing weights.

[0005] Furthermore, the frame is composed of a crossbeam and columns on both sides; an adjusting steel plate is connected to the crossbeam by bolts, and the adjusting steel plate is provided with an adjustable pulley. Several groups of connecting holes A that can fix the adjusting steel plate in different horizontal positions are distributed at intervals on the crossbeam, and a fixed pulley A is provided at the right end of the crossbeam; a triangular frame A is connected to the outward side of the upper part of the right column, and a fixed pulley B is provided on the triangular frame A, and the first steel wire rope is passed around the adjustable pulley, fixed pulley A and fixed pulley B in sequence.

[0006] Furthermore, a triangular frame B is connected to the outward side of the lower part of the left column, a fixed pulley C is provided on the triangular frame B, and a fixed pulley E is provided on the left side of the test groove slot, and the second steel wire rope passes around the fixed pulley C and the fixed pulley E in sequence.

[0007] Furthermore, a triangular frame C is connected to the outward side of the lower part of the right column, a fixed pulley D is provided on the triangular frame C, and a fixed pulley F is provided on the right side of the test groove slot. The third steel wire rope passes around the fixed pulley D and the fixed pulley F in sequence.

[0008] Furthermore, the triangular frame A, triangular frame B and triangular frame C are all connected to the columns by bolts, and the columns are provided with a row of connection holes B that can fix the triangular frames at different heights.

[0009] Furthermore, a pedestal is fixedly connected to the right side of the test trough, and two dial indicators for measuring the horizontal displacement and vertical displacement of the top of the pull-out pile are connected to the pedestal through a measuring instrument support.

[0010] Furthermore, a plurality of strain gauges arranged vertically at intervals are attached to the side surface of the lower portion of the pull-out pile, the strain gauges are connected to a strain collector via a wire, and the strain collector is connected to a computer via a wire.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] (1) The structure is simple, efficient and practical, and it can simultaneously apply combined loads in multiple directions, allowing for a more comprehensive and realistic evaluation of the actual stress state and bearing deformation characteristics of the pull-out piles;

[0013] (2) A pulley is introduced to change the direction of the applied force couple and study the influence of the bending moment distribution of the pile body on the bearing capacity and deformation performance of the pull-out pile; (3) A modular design is adopted, and most components can be disassembled and assembled, and can be adjusted and customized as needed. It is easy to assemble and convenient to operate.

[0014] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below through specific embodiments and related drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a front view of an embodiment of the utility model;

[0016] Figure 2 This is a top view of an embodiment of the utility model;

[0017] Figure 3 This is a left view of an embodiment of the utility model;

[0018] Figure 4 It is a right view of an embodiment of the utility model;

[0019] Figure 5 This is a partial enlarged schematic diagram of the connection between the beam and the column in the embodiment of the utility model;

[0020] Figure 6 This is a side view of the adjustable steel plate connection of the embodiment of the utility model;

[0021] Figure 7 A top view of the adjustable steel plate connection of the embodiment of the utility model;

[0022] Explanation of the numbers in the figure: 1. Pull-out pile, 2. Test soil, 3. Pile cap, 4. Pile bearing platform, 5. Measuring instrument support, 6. Dial indicator, 7. First steel wire rope, 8. Crossbeam, 9. Second steel wire rope, 10. Third steel wire rope, 11. Column, 12. Triangular frame A, 13. Triangular frame B, 14. Triangular frame C, 15. Adjustable pulley, 16. Fixed pulley A, 17. Fixed pulley B, 18. Fixed pulley C, 19. Fixed pulley D, 20. Bolt, 21. Test trough, 22. Loading trough, 23. Weight, 24. Adjustable steel plate, 25. Fixed pulley E, 26. Fixed pulley F, 27. Computer, 28. Strain acquisition instrument, 29. Strain gauge, 30. Connecting hole A, 31. Connecting hole B. DETAILED DESCRIPTION

[0023] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0024] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0025] like Figures 1 to 7The figure shows a loading test device for simulating the effects of complex combined loads on pull-out piles. The device comprises a frame with a test trough 21 in the middle. The test trough 21 contains test soil 2, in which a pull-out pile 1 is inserted. The upper portion of the pull-out pile 1 extends above the surface of the test soil. The upper end of the pull-out pile is provided with a pile cap 3. The top of the pile cap 3 is connected to the traction end of a first steel wire rope 7 for applying a vertical load. The left side of the pile cap is connected to the traction end of a second steel wire rope 9 for applying a horizontal load. The right side of the upper portion of the pull-out pile is connected to the traction end of a third steel wire rope 10 for applying an oblique load. The loading ends of the first, second, and third steel wire ropes 7, 9, and 10 are all connected to a loading trough 22 for placing weights 23. The loading test device is simple in structure, efficient, and practical. It can simultaneously apply horizontal, vertical, oblique pull, and bending loads. By placing weights in the loading troughs, a combined load of horizontal, vertical, oblique pull, and bending loads can be applied.

[0026] In this embodiment, the frame is composed of a crossbeam 8 and columns 11 on both sides; an adjusting steel plate 24 is connected to the crossbeam 8 by bolts, and the bolts are preferably high-strength bolts. The adjusting steel plate 24 is provided with an adjustable pulley 15. Several groups of connecting holes A30 are spaced apart on the crossbeam 8 to fix the adjusting steel plate 24 at different horizontal positions. The left and right adjustment of the adjustable pulley 15 can be achieved by changing the installation position of the adjusting steel plate 24. A fixed pulley A16 is provided at the right end of the crossbeam 8; a triangular frame A12 is connected to the outward side of the upper part of the right column, and a fixed pulley B17 is provided on the triangular frame A12. The first steel wire rope 7 passes around the adjustable pulley 15, the fixed pulley A16 and the fixed pulley B17 in sequence. The crossbeam 8 is composed of two parallel beams with a gap between the two beams so that the first steel wire rope can pass through upward. The first steel wire rope 7 applies a vertical tensile load by placing weights on the corresponding loading slots.

[0027] In this embodiment, the lower outward portion of the left column 11 is connected to a triangular frame B13, which is equipped with a fixed pulley C18. A fixed pulley E25 is located to the left of the notch of the test slot 21. The second steel wire rope 9 passes through fixed pulleys C18 and E25 in sequence. By placing weights in the corresponding loading slots, the second steel wire rope 9 applies a horizontal load, allowing for the study and testing of the load-bearing and deformation characteristics of the pull-out pile under combined vertical and horizontal loads.

[0028] In this embodiment, the lower outward portion of the right column 11 is connected to a triangular frame C14, which is equipped with a fixed pulley D19. A fixed pulley F26 is located on the right side of the notch of the test slot 21. The third steel wire rope 10 is sequentially routed around fixed pulleys D19 and F26. Weights are placed in the corresponding loading slots to apply an oblique load to the third steel wire rope 10. The second and third steel wire ropes 9 and 10 apply opposite loads on either side of the pullout pile, forming a couple that applies a bending moment load to the pile. Simultaneously, a vertical pullout load is applied to study the load-bearing performance under the combined effects of a vertical pullout load and a bending moment load. Alternatively, a horizontal load is applied to study the load-bearing performance under the combined effects of a horizontal load and a bending moment load.

[0029] By adjusting the position of the adjustable pulley to meet the inclined loading angle required for the test, the inclined load of the pull-out pile can be loaded; the bending moment load is applied to study the bearing performance under the combined action of the inclined load and the bending moment load.

[0030] In this embodiment, the triangular frame A12, triangular frame B13 and triangular frame C14 are all connected to the column by bolts. The column is provided with a row of connection holes B31 that can fix the triangular frame at different heights. The triangular frame A12, triangular frame B13 and triangular frame C14 are all right triangles, one of which is located on the upper side, and the corresponding fixed pulley is installed at the end facing outward. The other right-angled side is provided with a plurality of bolt holes and is connected to the column by bolts. The fixed pulley on the triangular frame can be adjusted up and down by changing the installation position of the triangular frame.

[0031] In this embodiment, a cap 4 is fixedly attached to the right side of the test trough 21. Two dial indicators 6, used to measure the horizontal and vertical displacements of the pullout pile top, are connected to the cap 4 via a measuring instrument support 5. One dial indicator is fixed horizontally, while the other is fixed vertically. The horizontally fixed dial indicator measures the horizontal displacement of the pile top, while the vertically fixed dial indicator measures the vertical displacement of the pile top. The test trough is constructed from welded steel plates.

[0032] In this embodiment, a plurality of vertically spaced strain gauges 29 are affixed to the lower side of the pullout pile 1. These strain gauges 29 are connected to a strain collector 28 via wires, which in turn are connected to a computer 27 via wires. Strain gauges are affixed to the lower portion of the pile (i.e., the section inserted into the test soil) and are connected to the strain collector via wires. The strain collector uploads collected pile strain data to the computer 27 via wires for monitoring the internal forces and deformation of the pullout pile under combined loads.

[0033] Specific loading process of the loading test device:

[0034] By adding weights in the two test grooves 22 connected to the first steel wire rope and the second steel wire rope respectively, vertical tension and horizontal combined loads are applied to the pull-out pile 1; by adding weights in the two test grooves 22 connected to the second steel wire rope and the third steel wire rope respectively, horizontal load and bending moment load are applied to the pull-out pile 1; by adding weights in the three test grooves 22 connected to the first steel wire rope, the second steel wire rope and the third steel wire rope respectively, vertical tension load and bending moment load are applied to the pull-out pile 1; by adjusting the position of the adjustable pulley, the angle of the traction end of the first steel wire rope is changed, and then weights are added in the three test grooves 22 connected to the first steel wire rope, the second steel wire rope and the third steel wire rope respectively, to apply inclined load and bending moment load to the pile.

[0035] This loading test device can simulate the complex combined loads that pull-out piles are subjected to under actual engineering conditions. This device can simultaneously apply loads in multiple directions, namely vertical tensile loads, horizontal loads and bending moment loads, thereby comprehensively evaluating the bearing capacity of pull-out piles under various working conditions.

[0036] Unless otherwise stated, any numerical range disclosed for any technical solution disclosed in the present invention is a preferred numerical range. Those skilled in the art should understand that a preferred numerical range is merely a numerical range that provides a more significant or representative technical effect among a wide range of practicable values. Due to the large number of numerical values, it is impossible to enumerate them exhaustively. Therefore, only some numerical values ​​are disclosed in the present invention to illustrate the technical solution of the present invention. Furthermore, the numerical values ​​listed above should not be construed as limiting the scope of protection of the present invention.

[0037] If the present invention discloses or involves components or structural parts that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connection using bolts or screws), and can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integrated structure (for example, manufactured by integral molding using a casting process) (except where it is obviously not possible to use an integrated molding process).

[0038] In addition, unless otherwise stated, the terms used in any technical solution disclosed in the above-mentioned utility model to express positional relationships or shapes include states or shapes that are approximate, similar or close thereto.

[0039] Any component provided by the present invention can be assembled from multiple separate components, or can be a separate component manufactured by an integral forming process.

[0040] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation thereto. Any person skilled in the art may utilize the above disclosure to modify or remodel the present invention into equivalent embodiments. However, any simple modifications, equivalent variations, and modifications to the above embodiments that do not depart from the technical content of the present invention and are based on the technical essence of the present invention shall remain within the scope of protection of the present invention.

Claims

1. A loading test device for simulating the complex combined load action of pull-out piles, characterized by: The utility model comprises a frame, wherein a test trough is provided in the middle of the frame, wherein the test trough is filled with test soil, an anti-pull-out pile is inserted in the test soil, the upper part of the anti-pull-out pile extends out of the surface of the test soil, and a pile cap is provided on the upper end of the anti-pull-out pile. The top of the pile cap is connected to the first steel wire rope traction end for applying a vertical load, the left side of the pile cap is connected to the second steel wire rope traction end for applying a horizontal load, and the right side of the upper part of the anti-pull-out pile is connected to the third steel wire rope traction end for applying an oblique load; the loading ends of the first steel wire rope, the second steel wire rope and the third steel wire rope are all connected to a loading trough for placing weights.

2. The loading test device for simulating complex combined loads of pull-out piles according to claim 1 is characterized in that: The frame is composed of a crossbeam and columns on both sides; an adjusting steel plate is connected to the crossbeam by bolts, and the adjusting steel plate is provided with an adjustable pulley. Several groups of connecting holes A that can fix the adjusting steel plate in different horizontal positions are distributed at intervals on the crossbeam, and a fixed pulley A is provided at the right end of the crossbeam; a triangular frame A is connected to the outward side of the upper part of the right column, and a fixed pulley B is provided on the triangular frame A, and the first steel wire rope is passed around the adjustable pulley, fixed pulley A and fixed pulley B in sequence.

3. The loading test device for simulating complex combined loads of pull-out piles according to claim 2, characterized in that: A triangular frame B is connected to the outward side of the lower part of the left column, a fixed pulley C is provided on the triangular frame B, and a fixed pulley E is provided on the left side of the test groove notch. The second steel wire rope passes around the fixed pulley C and the fixed pulley E in sequence.

4. The loading test device for simulating complex combined loads of pull-out piles according to claim 3 is characterized in that: A triangular frame C is connected to the outward side of the lower part of the right column, a fixed pulley D is provided on the triangular frame C, and a fixed pulley F is provided on the right side of the test groove notch. The third steel wire rope passes around the fixed pulley D and the fixed pulley F in sequence.

5. The loading test device for simulating complex combined loads of pull-out piles according to claim 4 is characterized in that: The triangular frame A, triangular frame B and triangular frame C are all connected to the columns by bolts. The columns are provided with a row of connection holes B that can fix the triangular frames at different heights.

6. The loading test device for simulating complex combined loads on pull-out piles according to claim 1, characterized in that: A pedestal is fixedly connected to the right side of the test trough, and two dial indicators for measuring the horizontal displacement and vertical displacement of the top of the pull-out pile are connected to the pedestal through a measuring instrument support.

7. The loading test device for simulating complex combined loads on pull-out piles according to claim 1, characterized in that: A plurality of strain gauges arranged vertically and spaced apart are pasted on the side surface of the lower part of the pull-out pile. The strain gauges are connected to a strain collector through a wire, and the strain collector is connected to a computer through a wire.

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