Soil body fixing mechanism for detection of quadruple direct shear apparatus

Abstract

The invention discloses a soil body fixing mechanism for detection of a quadruple direct shear apparatus, and relates to the technical field of soil detection. The soil body fixing assembly is embedded in the shearing box and is used for fixing the soil body; wherein the soil body fixing assembly comprises an upper cover and a lower cover which correspond to each other up and down, the upper cover and the lower cover are filled with filling liquid, and the filling liquid is solid at normal temperature and is liquid after being heated; when the soil body is inserted into the lower cover, the space between the lower cover and the soil block is filled with the filling liquid. According to the soil body fixing mechanism for detection of the quadruple direct shear apparatus, the filling liquid capable of being solidified at normal temperature is adopted to block the gap between the soil body and the shear box, so that the technical problem that the stability of the soil body cannot be guaranteed when an existing quadruple direct shear apparatus is used is effectively solved, and the soil body fixing mechanism can be used for fixing the soil body during shearing. The soil body in the shearing box cannot move, so that the stability of the soil body during shearing is ensured, and the accuracy of shearing experiment data is improved.

Description

Technical Field

[0001] The invention relates to the technical field of soil detection, and in particular to a soil fixing mechanism for detection by a quadruple direct shear instrument. Background Art

[0002] Direct shear test is referred to as "direct shear test". It is a test method that uses a direct shear instrument (abbreviated as "direct shear instrument") to carry out shear test on soil samples, so as to determine the shear strength index of soil. The soil sample is placed in the fixed upper box and movable lower box of the direct shear instrument. During the test, vertical pressure is first applied to the soil sample, and then horizontal thrust is applied to the lower box. The displacement between the upper and lower boxes causes the soil sample to be sheared. To determine the shear strength of a certain type of soil, four soil samples are usually used, and the corresponding shear strength is measured under different vertical pressures.

[0003] At present, when the existing quadruple direct shear apparatus is used, the container box is divided into an upper container box and a lower container box, and the container box is installed and positioned by grooves and bosses, so that it is convenient to clean the container box after the experiment, which can effectively improve work efficiency and make cleaning more thorough; by setting a limit block, it can prevent forward and backward movement and ensure the accuracy of the experiment; by adding a screw at the top of the container box, the gap between the push rod and the shear box can be eliminated, shortening the test time and speeding up the progress.

[0004] However, during the implementation of the above technical solution, it was found that there were at least the following technical problems:

[0005] 1. The stability of the soil cannot be maintained during shearing (the soil outside the shearing position): When using the existing quadruple direct shear apparatus, the soil needs to be cut into a specified size and shape before being placed in a shear box for shearing testing. However, when the soil is cut, it cannot be guaranteed that the soil can fully fill the shear box, which will transfer to other directions (the soil on the shear plane transfers to the gap between the soil and the shear box), resulting in a reduction in the soil at the detection shear plane position. Therefore, the data obtained by shearing is inaccurate and unstable;

[0006] 2. Large manual shearing errors and single shearing data: When using the existing four-in-one direct shear tester, it mainly relies on manual cutting of the soil into a specified size and shape, and then placing it in a shear box for shearing experiments. Due to manual uncertainty, the soil surface is deformed during cutting, so there is a large discrepancy between the cutting data and the actual data during cutting. Secondly, a shear box can only shear soil of a specified size and shape (that is, it can only shear soil blocks of a specified diameter), and it is impossible to detect the shearing data of soils of different diameters (in the same shear box). Therefore, a shear box of one diameter can only shear soils with a specific outer diameter. For this reason, we propose a soil fixing mechanism for the four-in-one direct shear tester. Summary of the invention

[0007] 1. Technical issues to be resolved

[0008] In view of the shortcomings of the prior art, the present invention provides a soil fixing mechanism for detection by a quadruple direct shear instrument, which solves the technical problems that the existing quadruple direct shear instrument cannot maintain the stability of the soil (except the soil at the shear point) during shearing, the manual shearing error is large, and the shearing data is single.

[0009] (II) Technical solution

[0010] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0011] A soil fixing mechanism for a quadruple direct shear tester, the soil fixing mechanism comprising a shear box for shearing test, the interior of the shear box being provided with a soil fixing assembly for fixing the soil (for maintaining the stability of the soil except the shearing surface during shearing)

[0012] Shear box, used for shear experiments;

[0013] The soil fixing component is embedded in the shear box to fix the soil and maintain the stability of the soil except the shear surface to prevent the soil at the shear surface (the plane between the upper cover and the lower cover) from moving into the gap between the soil and the shear box during shearing.

[0014] The soil fixing assembly includes an upper cover and a lower cover corresponding to each other, and the interior of the upper cover and the lower cover is filled with a filling liquid, which is solid at room temperature and liquid after heating;

[0015] When the soil is inserted into the lower cover, the filling liquid is filled between the lower cover and the soil block, blocking the gap between the soil and the soil fixing assembly, making the soil unable to move, and the soil on the shear surface cannot move into the soil fixing assembly.

[0016] Preferably, the inner walls of the upper cover and the lower cover are both bonded with films for solid-liquid separation. After use, the filling liquid (such as wax, etc.) is melted to separate the melted filling liquid from the soil, which is convenient for reuse.

[0017] Preferably, a cutting assembly for cutting soil is installed outside the soil fixing assembly, and the cutting assembly includes a fixing ring (rotatable on the soil fixing assembly) for connecting the cutting piece and the soil fixing assembly and a shaft for driving the cutting piece to rotate, and the cutting piece for cutting soil is installed on the shaft;

[0018] A fixed ring, movably connected between the upper cover and the lower cover, and rotating on the outer wall of the cover body;

[0019] A limit seat connected to the outside of the fixing ring, and a shaft (used to drive the cutting member to rotate) is installed inside the limit seat; and

[0020] The cutting member is connected to the outside of the shaft rod. When the fixing ring rotates, the cutting member cuts the soil between the upper cover and the lower cover.

[0021] Preferably, the fixing ring includes an upper fixing ring connected to the outer wall of the upper cover (the upper fixing ring rotates along the outer wall of the upper cover, as Figure 3 shown) and a lower fixing ring connected to the outer wall of the lower cover (the lower fixing ring rotates along the outer wall of the lower cover, as Figure 3 shown).

[0022] Preferably, there are two limiting seats. One is connected to the outside of the upper fixing ring, and the other is connected to the outside of the lower fixing ring, and the two limiting seats correspond to each other up and down;

[0023] A pin is provided on the outside of one of the limiting seats, and the pin is inserted between the limiting seat and the pin slot on the outside of the shaft rod. After the shaft rod rotates in place, the pin is inserted into the limiting seat and inserted into the pin slot on the outside of the shaft rod, so that the shaft rod and the limiting seat are connected together. At this time, the shaft rod cannot rotate, so as to keep the position of the shaft rod (and the cutting member outside the shaft rod), so as to cut the stable soil. A scale is provided on the upper cover, and the cutting depth of the cutting member when cutting the soil can be intuitively seen.

[0024] Preferably, the shaft rod includes a rotating shaft and a driven shaft inserted into the limiting seat, and the cutting member is connected between the rotating shaft and the driven shaft;

[0025] Among them, an indicating rod is installed on the outside of the rotating shaft, corresponding to the scale on the upper cover, and the cutting depth of the cutting member can be obtained. The rotating surface of the indicating rod is parallel to the top plane of the upper cover and corresponds to the cutting member up and down, as Figure 3 shown.

[0026] Preferably, the length of the cutting member is the same as the length of the indicating rod, and the two rotate synchronously, which is convenient for displaying the position of the cutting member.

[0027] Preferably, the shape of the cutting member is "匚"-shaped, and both ends of the cutting member are inserted into the rotating shaft and the driven shaft respectively, so that the rotating shaft and the driven shaft rotate synchronously.

[0028] Preferably, the rotating plane of the cutting member is located at the gap between the upper cover and the lower cover, so as to cut the soil between the upper cover and the lower cover, and adjust the outer diameter size of the position of the soil shear plane. The plane between the upper cover and the lower cover is the soil shear plane.

[0029] Preferably, the shear box includes a water storage box, and the top of the water storage box is provided with a lower shear box and an upper shear box corresponding to each other up and down, and the soil fixing assembly is embedded between the lower shear box and the upper shear box.

[0030] (III) Beneficial effects

[0031] 1. Since the gap between the soil and the shear box is blocked by a filling liquid that can solidify at room temperature, the technical problem that the existing quadruple direct shear apparatus cannot fully fix the soil during use is effectively solved, thereby ensuring the stability of the soil during shearing and improving the accuracy of the shear test data.

[0032] 2. Since a cutting piece is used to cut the soil, and the cutting piece can adjust the cutting depth as needed, the technical problems of large manual shearing errors and single shearing data when using the existing quadruple direct shear apparatus are effectively solved, thereby realizing mechanical cutting of the soil and ensuring the accuracy of soil cutting. At the same time, the outer diameter of the soil at the shear surface position can be adjusted as needed, thereby obtaining multiple sets of data and improving the applicability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0034] Figure 1 is an overall structural diagram of an embodiment of the present invention;

[0035] Figure 2 An exploded view of an embodiment of the present invention;

[0036] Figure 3 A connection diagram of a soil fixing assembly and a cutting assembly in an embodiment of the present invention;

[0037] Figure 4 is a cross-sectional view of a soil fixing assembly and a cutting assembly in an embodiment of the present invention;

[0038] Figure 5 An exploded view of a soil fixing assembly and a cutting assembly in an embodiment of the present invention;

[0039] Figure 6 This is one of the structural diagrams of the cutting assembly in an embodiment of the present invention;

[0040] Figure 7 This is the second structural diagram of the cutting assembly in the embodiment of the present invention;

[0041] Figure 8 Schematic diagram of the shaft and cutting member in an embodiment of the present invention.

[0042] Legend: 1. Water storage box; 2. Lower shear box; 3. Upper shear box; 4. Soil fixing assembly; 41. Upper cover; 42. Lower cover; 43. Film; 44. Filling liquid; 5. Cutting assembly; 51. Upper fixing ring; 52. Lower fixing ring; 53. Limit seat; 54. Rotating shaft; 55. Driven shaft; 56. Cutting piece; 57. Pin; 58. Pin groove. DETAILED DESCRIPTION

[0043] The embodiment of the present application provides a soil fixing mechanism for testing a quadruple direct shear apparatus, thereby solving the technical problems that the existing quadruple direct shear apparatus cannot maintain soil stability during shearing (soil except at the shearing point), has large manual shearing errors, and has single shearing data. When the existing quadruple direct shear apparatus is used, a filling liquid that can solidify at room temperature is used to block the gap between the soil and the shear box, thereby achieving the goal that the soil inside the shear box cannot move during shearing, thereby ensuring the stability of the soil during shearing and improving the accuracy of the shear test data. A cutting piece is used to cut the soil, and the cutting piece can adjust the cutting depth as needed, thereby achieving mechanical cutting of the soil and ensuring the accuracy of soil cutting. At the same time, the outer diameter of the soil at the shear surface position can be adjusted as needed, thereby obtaining multiple sets of data and improving the applicability of the device.

[0044] Example 1

[0045] The technical solution in the embodiment of the present application solves the technical problem that the existing quadruple direct shear apparatus cannot maintain the stability of the soil during shearing (the soil except the shearing part) when in use. The overall idea is as follows:

[0046] In view of the problems existing in the prior art, the present invention provides a soil fixing mechanism for testing a quadruple direct shear instrument, the soil fixing mechanism comprising a shear box for shearing test, a soil fixing assembly 4 for fixing the soil installed inside the shear box (used to maintain the stability of the soil except the shear surface during shearing)

[0047] Shear box, used for shear experiments;

[0048] The soil fixing assembly 4 is embedded in the shear box and is used to fix the soil to maintain the stability of the soil except for the shear surface, so as to prevent the soil at the shear surface (the plane between the upper cover 41 and the lower cover 42) from moving into the gap between the soil and the shear box during shearing;

[0049] The soil fixing assembly 4 comprises an upper cover 41 and a lower cover 42 corresponding to each other, and the interior of the upper cover 41 and the lower cover 42 is filled with a filling liquid 44, which is solid at room temperature and liquid after being heated;

[0050] When the soil is inserted into the lower cover 42 , the filling liquid 44 is filled between the lower cover 42 and the soil block, blocking the gap between the soil and the soil fixing assembly 4 , making the soil unable to move, and the soil on the shear surface cannot move into the soil fixing assembly 4 .

[0051] In some examples, the inner walls of the upper cover 41 and the lower cover 42 are bonded with a film 43 for solid-liquid separation. After use, the filling liquid 44 (such as wax, etc.) is melted to separate the melted filling liquid 44 from the soil for easy reuse.

[0052] In some examples, the shear box includes a water storage box 1 , and a lower shear box 2 and an upper shear box 3 corresponding to each other are provided on the top of the water storage box 1 , and a soil fixing component 4 is embedded between the lower shear box 2 and the upper shear box 3 .

[0053] Solution 1: When in use, the soil that needs to be sheared is placed in the cavity between the upper cover 41 and the lower cover 42, and then the distance between the upper cover 41 and the lower cover 42 is adjusted. After completion, the upper cover 41 (or the lower cover 42) is heated to melt the filling liquid 44 inside it. After it is completely melted, it is placed upside down (i.e., the upper cover 41 is up and down, and the soil is downward), so that the filling liquid 44 inside the upper cover 41 passes through the film 43 and flows into the gap between the soil and the upper cover 41, thereby filling the gap between the soil and the upper cover 41. After the filling liquid 44 solidifies, the shape of the soil and the filling liquid 44 is consistent with the shape of the inner cavity of the upper cover 41 (or the lower cover 42). Therefore, during the test, the soil inside the upper cover 41 cannot move. Therefore, during shearing, the soil on the shear surface cannot move toward the inside of the upper cover 41, thereby ensuring the stability of the soil during shearing. Similarly, the soil and the lower cover 42 are connected together.

[0054] Solution 2: When in use, the upper cover 41 is heated to melt the filling liquid 44 inside it. After it is completely melted, the soil is inserted into the upper cover 41. At this time, the filling liquid 44 (melted) inside the upper cover 41 is filled into the gap between the soil and the upper cover 41 under the squeezing force of the soil. Similarly, after the filling liquid 44 solidifies, the lower cover 42 is heated to melt the filling liquid 44 inside it, and the other end of the soil is inserted into the lower cover 42, and the distance between the upper cover 41 and the lower cover 42 is adjusted. After the filling liquid 44 inside the lower cover 42 solidifies, the connection between the soil and the soil fixing assembly 4 is completed.

[0055] This process does not require ensuring the shape of the soil inserted into the upper cover 41 (or lower cover 42), because the melted filling liquid 44 can fit tightly with the surface of the soil. After solidification, the shape of the soil and the filling liquid 44 is consistent with the shape of the inner cavity of the upper cover 41 (or lower cover 42), which reduces the difficulty of material preparation before the experiment and ensures stability during soil cutting (no shaking).

[0056] After use, the lower cover 42 is first heated to melt the filling liquid 44 inside it, and then the soil is pulled up. The melted filling liquid 44 passes through the film 43 and enters the gap between the film 43 and the lower cover 42. Then the soil is rotated to make the upper cover 41 face downward. Similarly, the upper cover 41 is heated to melt the filling liquid 44 inside it, thereby completely removing the soil.

[0057] Example 2

[0058] Based on Example 1, the embodiment of the present application solves the technical problems of large manual shearing error and single shearing data when the existing quadruple direct shear apparatus is used. The overall idea is as follows:

[0059] A cutting assembly 5 for cutting soil is installed outside the soil fixing assembly 4, and the cutting assembly 5 includes a fixing ring for connecting a cutting member 56 and the soil fixing assembly 4 (rotatable on the soil fixing assembly 4) and a shaft for driving the cutting member 56 to rotate, and the cutting member 56 for cutting soil is installed on the shaft;

[0060] A fixed ring, movably connected between the upper cover 41 and the lower cover 42, and rotating on the outer wall of the cover body;

[0061] A limit seat 53 is connected to the outside of the fixing ring, and a shaft is installed inside the limit seat 53 (for driving the cutting member 56 to rotate); and

[0062] The cutting member 56 is connected to the outside of the shaft. When the fixing ring rotates, the cutting member 56 cuts the soil between the upper cover 41 and the lower cover 42 .

[0063] In some examples, the fixing ring includes an upper fixing ring 51 connected to the outer wall of the upper cover 41 (the upper fixing ring 51 rotates along the outer wall of the upper cover 41, such as Figure 3 ) and a lower fixing ring 52 connected to the outer wall of the lower cover 42 (the lower fixing ring 52 rotates along the outer wall of the lower cover 42, as shown Figure 3 shown).

[0064] In some examples, the limiting seats 53 include two, one connected to the outside of the upper fixing ring 51, and the other connected to the outside of the lower fixing ring 52, and the two limiting seats 53 correspond to each other up and down;

[0065] One of the limiting seats 53 is provided with a bolt 57 on its outer part, and the bolt 57 is inserted between the limiting seat 53 and the pin slot 58 on the outer part of the shaft rod. After the shaft rod rotates in place, the bolt 57 is inserted into the limiting seat 53 and is inserted into the pin slot 58 on the outer part of the shaft rod, so that the shaft rod and the limiting seat 53 are connected together. At this time, the shaft rod cannot rotate, thereby maintaining the position of the shaft rod (and the cutting member 56 on the outer part of the shaft rod), and thus cutting the soil mass stably. The upper cover 41 is provided with scales, and the cutting depth of the cutting member 56 when cutting the soil mass can be intuitively seen.

[0066] In some examples, the shaft rod includes a rotating shaft 54 and a driven shaft 55 inserted into the limiting seat 53, and the cutting member 56 is connected between the rotating shaft 54 and the driven shaft 55;

[0067] Among them, an indicating rod is installed on the outer part of the rotating shaft 54, corresponding to the scales on the upper cover 41, and the cutting depth of the cutting member 56 can be obtained. And the rotating surface of the indicating rod is parallel to the top plane of the upper cover 41 and corresponds to the cutting member 56 up and down, as Figure 3 shown. The length of the cutting member 56 is the same as that of the indicating rod, and the two rotate synchronously, which is convenient for displaying the position of the cutting member 56. The shape of the cutting member 56 is in a "C" shape, and both ends of the cutting member 56 are respectively inserted into the rotating shaft 54 and the driven shaft 55, so that the rotating shaft 54 and the driven shaft 55 rotate synchronously. The rotating plane of the cutting member 56 is located at the gap between the upper cover 41 and the lower cover 42, so as to cut the soil mass between the upper cover 41 and the lower cover 42 (i.e., the soil shear surface), and adjust the outer diameter size of the position of the soil shear surface.

[0068] After the soil mass is fixed to the soil fixing assembly 4, the cutting member 56 is inserted onto the shaft rod (that is, both ends of the cutting member 56 are respectively inserted onto the rotating shaft 54 and the driven shaft 55, as Figure 8 shown), so that the cutting member 56 and the shaft rod are connected together. Then, the rotating shaft 54 is rotated to drive the cutting member 56 to move in the gap between the upper cover 41 and the lower cover 42 (in this process, the soil mass inside the soil fixing assembly 4 will be cut), forming a shape as Figure 7 shown. While the rotating shaft 54 rotates, the external indicating rod moves on the surface of the upper cover 41. Since the upper cover 41 is provided with scales, the cutting depth of the cutting member 56 can be obtained. After the rotating shaft 54 rotates in place, the bolt 57 is inserted into the limiting seat 53 and is inserted into the pin slot 58 on the outer part of the shaft rod, so that the shaft rod and the limiting seat 53 are connected together. At this time, the shaft rod cannot rotate, thereby maintaining the position of the shaft rod (and the cutting member 56 on the outer part of the shaft rod), and thus maintaining the stability of cutting the soil mass. Finally, the fixing ring is rotated to drive the cutting member 56 to cut the soil mass inside the soil fixing assembly 4, adjust the outer diameter size of the position of the soil shear surface, and obtain the shear test data of soil masses with different outer diameters, improving the applicability of the device.

[0069] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of the present invention.

Claims

1. A soil fixing mechanism for quadruple direct shear instrument testing, characterized in that: The soil fixing mechanism includes: A shear box; A soil fixing component (4) embedded in the shear box for fixing the soil; Among them, the soil fixing component (4) includes an upper cover (41) and a lower cover (42) corresponding up and down, and the interior of the upper cover (41) and the lower cover (42) is filled with a filling liquid (44). The filling liquid (44) is solid at normal temperature and liquid after heating; When the soil is inserted into the lower cover (42), the filling liquid (44) fills the space between the lower cover (42) and the soil mass.

2. A soil fixing mechanism for quadruple direct shear instrument testing as claimed in claim 1, characterized in that: The inner walls of the upper cover (41) and the lower cover (42) are both adhered with a film (43) for solid-liquid separation.

3. A soil fixing mechanism for quadruple direct shear instrument detection as described in any one of claims 1-2, characterized in that: An external cutting component (5) for cutting soil is installed on the outside of the soil fixing component (4), and the cutting component (5) includes: A fixing ring movably connected between the upper cover (41) and the lower cover (42); A limit seat (53) connected to the outside of the fixing ring, and a shaft rod is installed inside the limit seat (53); And A cutting piece (56) connected to the outside of the shaft rod. When the fixing ring rotates, the cutting piece (56) cuts the soil between the upper cover (41) and the lower cover (42).

4. A soil fixing mechanism for quadruple direct shear instrument testing as claimed in claim 3, characterized in that: The fixing ring includes an upper fixing ring (51) connected to the outer wall of the upper cover (41) and a lower fixing ring (52) connected to the outer wall of the lower cover (42).

5. A soil fixing mechanism for quadruple direct shear instrument testing as claimed in claim 3, characterized in that: There are two limit seats (53), one connected to the outside of the upper fixing ring (51) and the other connected to the outside of the lower fixing ring (52), and the two limit seats (53) correspond up and down; A pin (57) is provided on the outside of one of the limit seats (53), and the pin (57) is inserted between the limit seat (53) and a pin slot (58) on the outside of the shaft rod.

6. A soil fixing mechanism for quadruple direct shear instrument testing as claimed in claim 5, characterized in that: The shaft rod includes a rotating shaft (54) and a driven shaft (55) inserted into the limit seat (53), and the cutting piece (56) is connected between the rotating shaft (54) and the driven shaft (55); Among them, an indicating rod is installed on the outside of the rotating shaft (54), and the rotating plane of the indicating rod is parallel to the top plane of the upper cover (41) and corresponds up and down to the cutting piece (56).

7. A soil fixing mechanism for quadruple direct shear instrument testing as claimed in claim 6, characterized in that: The length of the cutting piece (56) is the same as the length of the indicating rod, and the two rotate synchronously.

8. The soil fixing mechanism for quadruple direct shear instrument detection as claimed in claim 6, characterized in that: The shape of the cutting piece (56) is in a "匚" shape, and the two ends of the cutting piece (56) are respectively inserted into the rotating shaft (54) and the driven shaft (55).

9. A soil fixing mechanism for quadruple direct shear instrument testing as claimed in claim 3, characterized in that: The rotating plane of the cutting piece (56) is located at the gap between the upper cover (41) and the lower cover (42).

10. The soil fixing mechanism for quadruple direct shear instrument detection according to claim 1, characterized in that: The shear box includes a water storage box (1), and a lower shear box (2) and an upper shear box (3) corresponding up and down are provided on the top of the water storage box (1). The soil fixing component (4) is embedded between the lower shear box (2) and the upper shear box (3).

Images