Adjustable force transmission column device for deep flat plate load test

Abstract

The utility model belongs to the technical field of deep flat plate load tests, and particularly relates to an adjustable deep flat plate load test force transmission column device which comprises a bearing platform, a force transmission column assembly arranged at the bottom of the bearing platform, a bearing plate arranged at the bottom of the force transmission column assembly, and a plurality of groups of short columns. The short column comprises a first hollow rectangular shell and a second hollow rectangular shell, the opposite sides of the first hollow rectangular shell and the second hollow rectangular shell communicate with each other, a first rectangular reinforcing frame is arranged at the bottom of the first hollow rectangular shell, and a rectangular sliding groove enabling the first rectangular reinforcing frame to slide is formed in the top of the second hollow rectangular shell. An electric telescopic rod is arranged on the inner wall of the top of the first hollow rectangular shell, and the telescopic end of the electric telescopic rod is connected with the inner wall of the bottom of the second hollow rectangular shell. The device not only can adjust the height, but also can provide excellent axial bearing capacity, flexural rigidity and overall stability in an extension state, so that the load transmission precision is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of deep plate load testing technology, specifically relating to an adjustable deep plate load testing force transmission column device. Background Technology

[0002] Deep plate load testing plays a crucial role in geotechnical engineering. It is a core in-situ testing method for accurately determining the bearing capacity, deformation characteristics, and other key mechanical properties of foundation soil at deep locations. In various large-scale infrastructure construction projects, such as skyscrapers, cross-sea bridges, and underground rail transit, accurately obtaining the mechanical parameters of deep foundation soil is the cornerstone for ensuring the safety and stability of the engineering structure.

[0003] In traditional deep plate load testing systems, the load transfer column device, as the core hub connecting the load-bearing platform and the pressure plate, bears the crucial responsibility of accurately transferring the applied load to the deep foundation soil. However, with the continuous deepening of geotechnical engineering practices and the increasing demands on technology, traditional load transfer column devices have gradually revealed a series of technical bottlenecks that urgently need to be addressed. These problems severely restrict the accuracy, efficiency, and wide applicability of deep plate load tests.

[0004] First, the fixed height of traditional force transmission column devices severely limits their application flexibility under different geological conditions. In actual engineering scenarios, geological conditions vary greatly from place to place, with significant differences in the layered structure of foundation soil, burial depth, and the required testing depth. For some projects requiring mechanical property testing of deep foundation soil, fixed-height force transmission column devices often fail to meet the corresponding depth requirements. This not only necessitates spending considerable time and money to redesign or build a suitable force transmission system before testing, but also inevitably introduces new sources of error because each change to the force transmission system is difficult to maintain consistency with the original design. This significantly reduces the accuracy of the test results, thereby affecting the reliability and safety of the engineering design.

[0005] Secondly, the stability and stiffness of traditional load transfer columns during load transfer become key factors affecting test accuracy. Deep plate load tests are typically conducted at a certain depth underground. When transferring large loads, the load transfer column not only bears its own weight but also experiences complex lateral pressures and frictional forces from the surrounding soil. Due to limitations in structural design, traditional load transfer column devices struggle to effectively handle the combined effects of these complex forces. During testing, the load transfer column is prone to significant lateral deformation, bending, and even overall instability. This directly leads to deviations in the load transfer path, resulting in substantial errors between the measured soil mechanical parameters and the actual conditions. Such errors can mislead engineers' judgments on the foundation's bearing capacity and deformation characteristics, posing serious safety hazards to engineering design and construction, and potentially even triggering catastrophic engineering accidents.

[0006] Furthermore, the recovery of traditional force transfer column devices after testing has become a major challenge in engineering practice. Due to the lack of an effective shrinkage mechanism in its structural design, extracting the force transfer column from the borehole after the test presents numerous difficulties. Especially for test sites with greater burial depth, the overall height of the force transfer column is large and difficult to disassemble or shrink effectively, making the extraction process not only time-consuming and labor-intensive, but also potentially damaging the device due to improper operation, and even causing damage to the soil structure around the test borehole, affecting the subsequent use of the site and the conduct of other testing work.

[0007] To address this, we propose an adjustable deep plate load test force transmission column device. This device not only allows for height adjustment but also provides excellent axial load capacity, bending stiffness, and overall stability in the elongated state, ensuring load transmission accuracy. Utility Model Content

[0008] The purpose of this invention is to provide an adjustable deep plate load test force transmission column device. This device can not only adjust the height, but also provide excellent axial bearing capacity, bending stiffness and overall stability in the extended state, ensuring the accuracy of load transmission.

[0009] The specific technical solution adopted by this utility model is as follows:

[0010] An adjustable deep plate load test force transmission column device includes a load-bearing platform, a force transmission column assembly is provided at the bottom of the load-bearing platform, and a pressure plate is provided at the bottom of the force transmission column assembly.

[0011] The force transmission column assembly consists of multiple sets of short columns, each including a first hollow rectangular shell and a second hollow rectangular shell. The first and second hollow rectangular shells are connected to each other on opposite sides. A first rectangular reinforcing frame is provided at the bottom of the first hollow rectangular shell, and a rectangular groove is provided at the top of the second hollow rectangular shell to allow the first rectangular reinforcing frame to slide. An electric telescopic rod is provided on the inner wall of the top of the first hollow rectangular shell, and the telescopic end of the electric telescopic rod is connected to the inner wall of the bottom of the second hollow rectangular shell. Telescopic reinforcing components are provided on all four side walls of the first and second hollow rectangular shells.

[0012] Furthermore, the length and width of the first hollow rectangular shell and the second hollow rectangular shell are the same.

[0013] Furthermore, the first rectangular reinforcing frame is matched with the rectangular groove.

[0014] Furthermore, the first rectangular reinforcing frame, the first hollow rectangular shell, and the second hollow rectangular shell are provided with anti-corrosion layers.

[0015] Furthermore, the telescopic reinforcing assembly includes four reinforcing plates, which are hinged together between every two reinforcing plates. The four reinforcing plates form a reinforcing rectangular frame, and the hinged joints of two of the reinforcing plates are respectively connected to the side walls of the first hollow rectangular shell and the second hollow rectangular shell.

[0016] Furthermore, a reinforcing telescopic rod is provided between every two sidewalls of the reinforcing plates.

[0017] Furthermore, each pair of short posts is connected by bolts.

[0018] The technical effects achieved by this utility model are as follows:

[0019] 1. The electric telescopic rod drive enables stepless or graded adjustment to adapt to the testing needs of different depths without the need to replace fixed force transmission columns of different lengths.

[0020] 2. The unique nested shell and reinforced frame slide design, combined with telescopic reinforcement components, provides excellent axial load-bearing capacity, bending stiffness and overall stability in the extended state, ensuring load transfer accuracy. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the short column of this utility model;

[0023] Figure 3 This is an exploded view of the short column of this utility model;

[0024] Figure 4 This is a structural schematic diagram of the telescopic reinforcement component of this utility model.

[0025] The attached diagram lists the components represented by each number as follows:

[0026] 1. Load-bearing platform; 2. Pressure plate; 3. Short column; 4. First hollow rectangular shell; 5. Second hollow rectangular shell; 6. First rectangular reinforcing frame; 7. Rectangular slide; 8. Electric telescopic rod; 9. Reinforcing plate; 10. Reinforcing telescopic rod. Detailed Implementation

[0027] To make the objectives and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model.

[0028] like Figures 1-4 As shown, an adjustable deep plate load test force transmission column device includes a load-bearing platform 1, a force transmission column assembly is provided at the bottom of the load-bearing platform 1, and a pressure plate 2 is provided at the bottom of the force transmission column assembly.

[0029] The force transmission column assembly consists of multiple short columns 3. Each short column 3 includes a first hollow rectangular shell 4 and a second hollow rectangular shell 5. The first hollow rectangular shell 4 and the second hollow rectangular shell 5 are connected to each other on opposite sides. A first rectangular reinforcing frame 6 is provided at the bottom of the first hollow rectangular shell 4. A rectangular groove 7 is provided at the top of the second hollow rectangular shell 5 to allow the first rectangular reinforcing frame 6 to slide. An electric telescopic rod 8 is provided on the inner wall of the top of the first hollow rectangular shell 4. The telescopic end of the electric telescopic rod 8 is connected to the inner wall of the bottom of the second hollow rectangular shell 5. Telescopic reinforcing components are provided on all four side walls of the first hollow rectangular shell 4 and the second hollow rectangular shell 5.

[0030] The first hollow rectangular shell 4 and the second hollow rectangular shell 5 have the same length and width. This arrangement ensures that the vertical load applied to the load-bearing platform 1 can be efficiently and evenly transferred to the pressure plate 2 along a continuous and vertical path, minimizing the generation of eccentric loads and bending moments, and improving the accuracy of test data.

[0031] Meanwhile, the first rectangular reinforcing frame 6 is matched with the rectangular slide 7. This arrangement allows the first rectangular reinforcing frame 6 to move smoothly inside the rectangular slide 7 without getting stuck.

[0032] It should be noted that the distance the first rectangular reinforcing frame 6 moves inside the rectangular slide groove 7 should match the distance the electric telescopic rod 8 extends and retracts. Matching means that the maximum stroke of the first rectangular reinforcing frame 6 will not exceed the rectangular slide groove 7.

[0033] The first rectangular reinforcing frame 6, the first hollow rectangular shell 4, and the second hollow rectangular shell 5 are provided with anti-corrosion layers, which can improve their anti-corrosion effect.

[0034] The telescopic reinforcement assembly includes four reinforcing plates 9, which are hinged together. The four reinforcing plates 9 form a reinforced rectangular frame, and the hinged joints of two of the reinforcing plates 9 are respectively connected to the side walls of the first hollow rectangular shell 4 and the second hollow rectangular shell 5. When the second hollow rectangular shell 5 moves downward, it causes the reinforced rectangular frame to contract and deform, providing lateral support and stiffness enhancement.

[0035] Furthermore, a reinforcing telescopic rod 10 is provided between every two side walls of the reinforcing plates 9, so that the reinforcing telescopic rod 10 can extend and retract during extension and retraction to further improve its lateral support and stiffness.

[0036] The extension and retraction trajectory of the reinforced telescopic rod 10 is matched with the retraction trajectory of the reinforcing plate 9, which enables the reinforced telescopic rod 10 to extend and retract.

[0037] It should be noted that the reinforcing components used in this invention are all made of high-strength materials, such as steel, which makes them less prone to damage.

[0038] Each pair of short columns 3 is connected by bolts, which facilitates the installation and removal of the short columns 3.

[0039] The working principle of this utility model is as follows: First, the electric telescopic rods 8 in all short column 3 units are in a retracted state, and the height of each unit is at its minimum. With the entire force transmission column assembly in its shortest state, the electric telescopic rods 8 within each short column 3 unit are extended sequentially or simultaneously, depending on the required test depth. These electric telescopic rods 8 push the second hollow rectangular shell 5 downwards relative to the first hollow rectangular shell 4, causing each short column 3 unit to extend. As the unit extends, the telescopic reinforcement components on its sidewalls extend, providing lateral support and increased stiffness. Multiple short column 3 units connected in series extend synchronously, driving the bottom pressure plate 2 to descend to a predetermined depth. The pressure plate 2 is positioned at the target depth, and a load is applied to the load-bearing platform 1 (through surcharge or jacks). The telescopic reinforcement components of each short column 3 unit ensure the overall stiffness and stability of the force transmission column during loading. After the test, the electric telescopic rods 8 of each short column 3 unit are retracted, pulling the second hollow rectangular shell 5 upwards, shortening the short column 3 unit. The telescopic reinforcement components retract accordingly, reducing the overall height of the force transmission column assembly, making it easier to remove the device from the hole. This device not only allows for height adjustment, but also provides excellent axial load-bearing capacity, bending stiffness, and overall stability in its extended state, ensuring accurate load transfer.

[0040] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.

Claims

1. An adjustable deep plate load test force transmission column device, comprising a load-bearing platform (1), wherein a force transmission column assembly is provided at the bottom of the load-bearing platform (1), and a pressure plate (2) is provided at the bottom of the force transmission column assembly; Its features are: The force transmission column assembly consists of multiple short columns (3). Each short column (3) includes a first hollow rectangular shell (4) and a second hollow rectangular shell (5). The first hollow rectangular shell (4) and the second hollow rectangular shell (5) are connected to each other on opposite sides. The bottom of the first hollow rectangular shell (4) is provided with a first rectangular reinforcing frame (6). The top of the second hollow rectangular shell (5) is provided with a rectangular groove (7) for sliding the first rectangular reinforcing frame (6). An electric telescopic rod (8) is provided on the inner wall of the top of the first hollow rectangular shell (4). The telescopic end of the electric telescopic rod (8) is connected to the inner wall of the bottom of the second hollow rectangular shell (5). Telescopic reinforcing components are provided on the four side walls of the first hollow rectangular shell (4) and the second hollow rectangular shell (5).

2. The adjustable deep plate load test force transmission column device according to claim 1, characterized in that: The first hollow rectangular shell (4) and the second hollow rectangular shell (5) have the same length and width.

3. The adjustable deep plate load test force transmission column device according to claim 1, characterized in that: The first rectangular reinforcing frame (6) is matched with the rectangular groove (7).

4. The adjustable deep plate load test force transmission column device according to claim 1, characterized in that: The first rectangular reinforcing frame (6), the first hollow rectangular shell (4), and the second hollow rectangular shell (5) are provided with anti-corrosion layers.

5. The adjustable deep plate load test force transmission column device according to claim 1, characterized in that: The telescopic reinforcement assembly includes four reinforcement plates (9), which are hinged to each other. The four reinforcement plates (9) form a reinforced rectangular frame, and the hinged joints of two of the reinforcement plates (9) are respectively connected to the side walls of the first hollow rectangular shell (4) and the second hollow rectangular shell (5).

6. The adjustable deep plate load test force transmission column device according to claim 5, characterized in that: A reinforcing telescopic rod (10) is provided between the side walls of each pair of reinforcing plates (9).

7. The adjustable deep plate load test force transmission column device according to claim 1, characterized in that: Each pair of short posts (3) is connected by bolts.

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