Model box test static loading device and use method thereof

Abstract

The present invention relates to a static loading device for a model box test and a method for using the device, belonging to the field of building construction technology. The device comprises a device body, the device body comprising a base plate, a loading frame, and a support assembly and a telescopic assembly arranged between the base plate and the loading frame. The telescopic assembly comprises an electric telescopic rod, the bottom end of the electric telescopic rod being rotatably connected to the base plate, the telescopic end being upward and fixedly connected to the bottom end of the loading frame, and the electric telescopic rod being sleeved with a driven gear; a driving device is also provided on the base plate, the driving device being connected to a dial through a driving shaft, and the dial is provided with three groups of gear groups that are meshed with the driven gears and rotate in an array with the axis of the dial as the rotation axis, each group of gear groups comprising at least three gears. The present invention has a simple structure, low cost, reliable loading, stable force, greatly reduces the influence of eccentric loads, and ensures the stability of the test process.

Description

Technical Field

[0001] The invention relates to a model box test static loading device and a use method thereof, belonging to the technical field of building construction. Background Art

[0002] Model box testing is a crucial step in geotechnical laboratory testing. During these tests, a vertical static load is often applied to observe the physical and mechanical properties of the geotechnical model under the static load. Different test types require different static loads, and varying model box sizes lead to a wide variety of static loading device sizes.

[0003] There are two main existing ways of applying static loads: one is to use an electronically controlled instrument to apply a stable load, and the other is to pile up a certain mass block to meet the static load requirement.

[0004] While electronically controlled instruments are convenient and precise in applying loads, they are susceptible to the size of the model box. Furthermore, electronically controlled instruments are generally expensive, making them prohibitively expensive for some simple model box tests. Static loading with stacked masses is simple and widely applicable. Applying static forces with stacked masses often requires a structurally stable loading device to support a large number of masses. This requires a sufficient loading space for the loading device. Placing the masses within the loading device can easily generate eccentric loads, requiring the loading device to possess a sufficient torque resistance capability.

[0005] However, existing static loading devices often do not consider the resistance to eccentric force, which is prone to test errors during testing. Especially when loading the model box test of silt soil with high fluidity, the eccentric pressure will cause the soil to flow and the loading plate to tilt, which is dangerous.

[0006] The horizontal and vertical loading device for pile foundation model testing disclosed in Chinese invention patent publication number CN104099954A includes a model box filled with sand with the same soil quality as the pile foundation construction site. The top of the model box is provided with a positioning device, which adjusts the pile pressing position of the model pile in the model box. The vertical loading device applies a vertical load to the model pile, and the horizontal loading device applies a horizontal load to the model pile.

[0007] Although the above reference example can perform lateral and vertical loading, it has more components and a more complex structure, so the cost is high. In addition, the influence of eccentric load is not considered, which easily increases the error of the test. Therefore, improvement is urgently needed. Summary of the Invention

[0008] In order to overcome the shortcomings of existing electronically controlled loading instruments, such as high cost and the fact that ordinary loading devices do not consider the influence of eccentric loads, the present invention designs a static loading device for model box testing and a method for using the same. The device has a simple structure, low cost, reliable loading, stable force, greatly reduces the influence of eccentric loads, and ensures the stability of the test process.

[0009] In order to achieve the above object, the present invention adopts the following technical solutions:

[0010] A static loading device for a model box test comprises a device body, which comprises a base plate, a loading frame, and a support assembly and a telescopic assembly arranged between the base plate and the loading frame. The telescopic assembly comprises an electric telescopic rod, the bottom end of the electric telescopic rod is rotatably connected to the base plate, and the telescopic end is upward and fixedly connected to the bottom end of the loading frame. A driven gear is also sleeved on the electric telescopic rod; a driving device is also provided on the base plate, and the driving device is connected to a dial through a driving shaft. The dial is provided with three groups of gear groups that are meshed with the driven gears and rotate in an array with the axis of the dial as the rotation axis, and each group of gear groups comprises at least three gears; the support assembly comprises a plurality of supporting outer rods evenly arranged on the base plate, and each supporting outer rod is provided with a guide wheel group for supporting external pressure. The guide wheel group comprises a plurality of guide wheels arranged along the length direction of the supporting outer rod, and the working surface of each guide wheel is coplanar with the side surface of the base plate.

[0011] Furthermore, four supporting outer rods are provided, and the four supporting outer rods are arranged in a rectangular shape and are sequentially provided at the four corners of the base plate.

[0012] Furthermore, four inner supporting rods arranged in a rectangular shape are provided inside the four outer supporting rods.

[0013] Furthermore, a counterweight block for balancing the gravity of the driving device is also provided on the bottom plate.

[0014] Furthermore, a plurality of observation ports are provided on each side wall of the loading frame.

[0015] Furthermore, four lifting rings are evenly arranged on the top of the loading frame along the circumference.

[0016] Furthermore, the cross section of the bottom plate in the horizontal direction and the cross section of the loading frame in the horizontal direction have exactly the same size and shape, and are both square.

[0017] A method for using a static loading device based on a model box test comprises the following steps:

[0018] S1: Measure the mass of the device and convert it into static force value;

[0019] S2: Place and stack several mass blocks of known mass and identical size and shape evenly in the loading frame;

[0020] S3: Lift the device body and place it into the model box;

[0021] S4: Control the extension of the electric telescopic rod to extend the loading frame out of the model box;

[0022] S5: Start the driving device, and the driving shaft drives the dial and the driven gear to rotate in sequence, and then the driven gear drives the electric telescopic rod and the loading frame to rotate.

[0023] Furthermore, in step S2, the mass of each layer of mass blocks is symmetrically distributed with the two horizontal midlines of the square bottom surface of the loading frame as symmetry axes.

[0024] Furthermore, in step S4 , the electric telescopic rod is controlled to extend so that the loading frame just extends out of the model box 6 .

[0025] Compared with the prior art, the present invention has the following characteristics and beneficial effects:

[0026] 1. Through the setting of the electric telescopic rod, the dial and the drive device, the loading frame can be rotated at a uniform speed after the mass block is placed, preventing the eccentric load caused by excessive mass in a certain direction, effectively reducing the impact of the eccentric load and improving the safety and stability of the test.

[0027] 2. Through the setting of the support assembly and the guide wheel group, it can effectively play a supporting role to prevent the generation of eccentric force due to uneven placement of the mass block.

[0028] 3. By setting the supporting inner rod, the stability and supporting capacity of the loading frame are improved to prevent the loading frame from being deformed due to uneven force when loading the mass block, which will affect the next use. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the present invention from a first perspective;

[0030] Figure 2 It is a structural schematic diagram of the second viewing angle of the present invention;

[0031] Figure 3 It is a front view of the present invention;

[0032] Figure 4 yes Figure 3 Cross-sectional view in the AA direction;

[0033] Figure 5 It is a schematic diagram of the use of the present invention.

[0034] The figures are marked as follows: 10, device body; 1, base plate; 11, counterweight; 2, loading frame; 21, observation port; 22, lifting ring; 3, support assembly; 31, support outer rod; 311, guide wheel group; 32, support inner rod; 4, telescopic assembly; 41, electric telescopic rod; 42, driven gear; 5, driving device; 51, driving shaft; 52, dial; 521, shifting gear; 6, model box; 7, mass block. DETAILED DESCRIPTION

[0035] The present invention will be described in more detail below with reference to the embodiments.

[0036] like Figures 1 to 4 As shown, the model box test static loading device of this embodiment includes a device body 10, the device body 10 includes a base plate 1, a loading frame 2, and a support assembly 3 and a telescopic assembly 4 arranged between the base plate 1 and the loading frame 2, the telescopic assembly 4 includes an electric telescopic rod 41, the bottom end of the electric telescopic rod 41 is rotatably connected to the base plate 1, the telescopic end is upward and fixedly connected to the bottom end of the loading frame 2, and the electric telescopic rod 41 is also sleeved with a driven gear 42; a driving device 5 is also provided on the base plate 1, and the driving device 5 is connected to a dial 52 through a driving shaft 51. The dial 52 is provided with three groups of gear groups that are meshed with the driven gear 42 and rotated in an array with the axis of the dial 52 as the rotation axis, and each group of gear groups includes three gears 521;

[0037] The support assembly 3 includes four outer support rods 31 and four inner support rods 32 arranged on the inner sides of the four outer support rods 31; the four outer support rods 31 and the four inner support rods 32 are arranged in a rectangular shape, and the four outer support rods 31 are arranged in sequence at the four corners of the base plate 1; the two side surfaces of the outer support rods 31 close to the edge of the base plate 1 are provided with guide wheel groups 311; each guide wheel group 311 includes three guide wheels arranged along the length direction of the outer support rod 31, and the working surface of each guide wheel is coplanar with the side surface of the base plate 1.

[0038] In particular, the working surface of the guide wheel is the section of the contact surface with the mold box 6.

[0039] Furthermore, a counterweight 11 is provided on the bottom plate 1 to balance the gravity of the driving device 5 and ensure uniform mass of the device.

[0040] Furthermore, a plurality of observation ports 21 are provided on each side wall of the loading frame 2 to facilitate observation of the situation inside the loading frame 2. If any mass block 7 deviates or falls, the test can be stopped in time to avoid damage to the device.

[0041] Furthermore, four lifting rings 22 are evenly arranged along the circumference at the top of the loading frame 2 to facilitate lifting and evenly distribute the lifting force, thereby avoiding excessive lifting force in a certain direction causing the mass block 7 to move in a certain direction and causing uneven mass distribution.

[0042] Furthermore, the horizontal cross-section of the base plate 1 and the horizontal cross-section of the loading frame 2 are exactly the same in size and shape, and are both square, ensuring that the ground size of the base plate 1 and the loading frame 2 are exactly the same, so that the mass of the entire device is evenly distributed, avoiding the influence of its own weight on the static test.

[0043] like Figure 5 As shown, the method for using the static loading device based on the model box test includes the following steps:

[0044] S1: Measure the mass of the device body 10 and convert it into a static force value;

[0045] S2: several mass blocks 7 of known mass and identical size and shape are evenly stacked in the loading frame 2;

[0046] S3: Lift the device body 10 and place it into the model box 6;

[0047] S4: Control the electric telescopic rod 41 to extend so that the loading frame 2 extends out of the model box 6;

[0048] S5: Start the driving device 5, and drive the dial 52 and the driven gear 42 to rotate in sequence through the driving shaft 51, and then the driven gear 42 drives the electric telescopic rod 41 and the loading frame 2 to rotate.

[0049] Furthermore, in step S2, the mass of each layer of mass blocks 7 is symmetrically distributed with the two center lines of the square bottom surface of the loading frame 2 as symmetry axes, ensuring uniform force, improving the accuracy of the static test results, and avoiding interference caused by uneven mass.

[0050] Furthermore, in step S4 , the electric telescopic rod 41 is controlled to extend so that the loading frame 2 just extends out of the model box 6 . Excessive extension of the electric telescopic rod 41 may cause instability of the device and risk of tipping over. It is sufficient to make the loading frame 2 just extend out of the model box 6 .

[0051] Particularly, the model box 6 is a rectangular parallelepiped box without a top cover, and its length and width are the same as the dimensions of the bottom plate 1 .

[0052] The working principle of the present invention is as follows: after the mass block 7 is evenly installed on the device body 10, the device body 10 is hoisted into the model box 6, and then the electric telescopic rod 41 is started to extend the loading frame 2 out of the model box 6, and then the driving device 5 is started, and the driving shaft 51 drives the dial 52 and the driven gear 42 to rotate in turn, and then the driven gear 42 drives the electric telescopic rod 41 and the loading frame 2 to rotate. Due to the setting of the dial teeth 521 on the dial 52, the electric telescopic rod 41 will rotate periodically, and the entire loading device will be evenly stressed, ensuring that the entire model box 6 will not fail the force test due to excessive force in a certain direction during the force application process.

[0053] In the description of the present invention, it should be noted that the terms "inside", "outside", "upper", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0054] In the description of the present invention, it should be noted that, unless otherwise specified or limited, the term "connection" should be understood in a broad sense. For example, it can mean a fixed connection, a detachable connection, or an integral connection; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0055] Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

Claims

1. A static loading device for a model box test, characterized by: The device comprises a main body (10), the main body (10) comprising a base plate (1), a loading frame (2), and a support assembly (3) and a telescopic assembly (4) arranged between the base plate (1) and the loading frame (2), the telescopic assembly (4) comprising an electric telescopic rod (41), the bottom end of the electric telescopic rod (41) being rotatably connected to the base plate (1), the telescopic end being upward and fixedly connected to the bottom end of the loading frame (2), and the electric telescopic rod (41) being further provided with a driven gear (42); the base plate (1) is further provided with a driving device (5), the driving device (5) being connected to the dial through a driving shaft (51). The dial (52) is provided with three groups of shifting teeth that are meshed with the driven gear (42) and are arranged in a rotating array on the dial (52) with the axis of the dial (52) as the rotation axis, and each group of shifting teeth includes at least three shifting teeth (521); the support assembly (3) includes a plurality of supporting outer rods (31) evenly arranged on the bottom plate (1), and each supporting outer rod (31) is provided with a guide wheel group (311) for supporting external pressure, and the guide wheel group (311) includes a plurality of guide wheels arranged along the length direction of the supporting outer rod (31), and the working surface of each guide wheel is coplanar with the side surface of the bottom plate (1); Four supporting outer rods (31) are provided, and the four supporting outer rods (31) are arranged in a rectangular shape and are sequentially arranged at the four corners of the bottom plate (1); A counterweight (11) for balancing the gravity of the driving device (5) is also provided on the bottom plate (1).

2. A static loading device for model box testing according to claim 1, characterized in that: Four supporting inner rods (32) arranged in a rectangular shape are further provided on the inner sides of the four supporting outer rods (31).

3. A static loading device for model box testing according to claim 1, characterized in that: A plurality of observation ports (21) are provided on each side wall of the loading frame (2).

4. A static loading device for model box testing according to claim 1, characterized in that: Four lifting rings (22) are evenly arranged along the circumference of the top end of the loading frame (2).

5. The static loading device for model box testing according to claim 1, characterized in that: The cross section of the bottom plate (1) in the horizontal direction and the cross section of the loading frame (2) in the horizontal direction are exactly the same in size and shape, and are both square.

6. A method for using the static loading device for model box testing according to any one of claims 1 to 5, characterized in that: The steps include: S1: Measure the mass of the device body (10) and convert it into a static force value; S2: several mass blocks (7) with known mass and identical size and shape are evenly stacked in the loading frame (2); S3: Lift the device body (10) and place it into the model box (6); S4: Control the electric telescopic rod (41) to extend so that the loading frame (2) extends out of the model box (6); S5: Start the driving device (5), and drive the dial (52) and the driven gear (42) to rotate in sequence through the driving shaft (51), and then the driven gear (42) drives the electric telescopic rod (41) and the loading frame (2) to rotate.

7. The method for using the static loading device for model box testing according to claim 6, characterized in that: In step S2, the mass of each layer of mass blocks (7) is symmetrically distributed with the two horizontal midlines of the square bottom surface of the loading frame (2) as symmetry axes.

8. The method for using the static loading device for model box testing according to claim 6, characterized in that: In step S4, the electric telescopic rod (41) is controlled to extend so that the loading frame (2) just extends out of the model box (6).

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