Sample preparation device of hollow torsional shear apparatus corresponding to nano silica sol solidified sandy soil

Abstract

The utility model discloses a sample preparation device of a hollow torsional shear apparatus corresponding to nano silica sol solidified sandy soil, the device comprises an inner tube, an outer tube, a sample sealing cover and a base, the device is of a hollow cylindrical structure, the bottom of the inner tube is integrally connected with the base, the top of the inner tube is connected with the sample sealing cover in a nested manner, and the bottom of the outer tube is connected with the base in a nested manner; a rubber membrane sleeves the inner tube, one end of the rubber membrane sleeves the base and is fixed on the base through a rubber ring, and the other end of the rubber membrane is flanged and sleeves the top of the outer tube and is used for wrapping a sample during sample preparation; a suction nozzle is arranged in the middle of the outer tube and is used for sucking out air between the outer tube and the rubber membrane during sample preparation, so that the rubber membrane is attached to the inner surface of the outer tube. According to the device, the function that a liquid curing agent such as nano silica sol is separated from a hollow torsional shear apparatus to prepare a sample independently when sandy soil is cured is realized, the sample can be integrally formed and manufactured in a rubber membrane, and the practicability is high.

Description

Technical Field

[0001] This application relates to the field of mechanical testing devices for building materials, and in particular to a sample preparation device for a hollow torsion shear apparatus for nano-silica sol-cured sand. Background Technology

[0002] Hollow cylindrical torsion shear apparatuses are widely used in geotechnical engineering due to their capabilities in dynamic loading and simulating complex stress paths. The sample loading process primarily involves uniformly pressing soil into the sample container, typically using a layered loading method. Sample preparation is a crucial step in hollow cylindrical torsion shear tests, especially when preparing colloid-cured samples. Problems often arise when adding liquid curing agents such as nano-silica sol; improper handling can damage the soil sample. For colloid-cured soils, particularly those with liquid curing agents like nano-silica sol, direct curing of the colloid solution on the hollow cylindrical torsion shear apparatus requires considerable time. Furthermore, if colloid loading is performed directly within the apparatus's loading device, the colloid may seep into screw holes, vents, and pressurization pipes during curing, causing blockages in the instrument's pores and pipes. This reduces instrument utilization and, in severe cases, can damage the instrument, resulting in wasted research resources. Utility Model Content

[0003] Objective: In order to overcome the shortcomings of the existing technology, this utility model provides a sample preparation device for a hollow torsion shear apparatus for solidified sand with nano-silica sol, which can directly complete the sample preparation inside the rubber membrane and form it in one piece.

[0004] Technical solution: To solve the above technical problems, the technical solution adopted by this utility model is as follows:

[0005] In one aspect, this application provides a sample preparation device for a hollow torsion shear apparatus for solidified sand using nano-silica sol, comprising an inner tube, an outer tube, a sample cap, and a base, and having a hollow cylindrical structure.

[0006] The bottom of the inner tube is integrally connected to the base, the top of the inner tube is nested and connected to the sample cap, and the bottom of the outer tube is nested and connected to the base.

[0007] The inner tube is covered with a rubber membrane. One end of the rubber membrane is inserted into the base and fixed to the base by a rubber ring, while the other end is flanged and fitted onto the top of the outer tube for wrapping the sample during sample preparation.

[0008] A suction nozzle is provided in the middle of the outer tube to suck out the air between the outer tube and the rubber membrane during sample preparation, so that the rubber membrane adheres to the inner surface of the outer tube.

[0009] After the rubber membrane is attached to the inner surface of the outer tube, it is used to ensure that the rubber membrane is directly packed together with the test soil sample during sample preparation, avoiding the problem of packing the rubber membrane separately later.

[0010] The inner tube is integrally connected to the base, and the outer tube is nested with the base under the wrapping of a rubber membrane. The sample cap is nested with the inner tube, which together makes the entire device internally sealed.

[0011] In some embodiments, the base includes a cylindrical nesting portion, a slot, a platform, a support, and a through-hole.

[0012] The cylindrical nested part is nested and connected to the bottom of the outer tube, and its size is smaller than that of the support platform;

[0013] The bottom surface of the platform is integrally connected to the support, and the top surface is integrally connected to the cylindrical nesting part. Its size is larger than that of the outer tube, which is used to support the nested outer tube and the sample, and facilitates the nesting of the rubber tube.

[0014] The side of the support platform is provided with a slot. The rubber membrane is fitted into the cylindrical nesting part and fixed on the support platform by a rubber ring. The rubber ring falls into the slot on the cylindrical nesting part. The slot is used to limit the position of the rubber ring.

[0015] The supports are configured in a multiple and circular array at the bottom of the base to support the overall structure of the sample preparation device;

[0016] The base has one or more through holes vertically, which penetrate the base from the vertical geometric center and are connected to a rubber tube for introducing liquid curing agent into the soil during sample preparation.

[0017] Liquid curing agent is introduced into the device from below to ensure uniform penetration of the sample by the liquid curing agent.

[0018] In some embodiments, a hollow fine-mesh mesh is placed at the upper end of the cylindrical nesting part to prevent the sample sand from entering the through-hole.

[0019] In some embodiments, the through-hole further includes a first rounded corner at its bottom, which facilitates nesting operations when connecting the rubber tube while ensuring the airtightness of the device.

[0020] In some embodiments, the bottom of the outer tube further includes a second rounded corner, which is used to nest the outer tube with the base.

[0021] In some embodiments, the inner tube and outer tube are used to shape the prepared sample. The outer diameter of the inner tube is the same as the inner diameter of the sample, and the inner diameter of the outer tube is the same as the outer diameter of the sample. The space formed by the inner tube, outer tube, sample cap and base after being connected and nested is the same as the required sample size.

[0022] In some embodiments, the inner tube, outer tube, sample cap, and base are all made of transparent rigid material.

[0023] In some embodiments, one end of the rubber tube extends into a through-hole via a first rounded corner, and the other end is connected to the outlet of a peristaltic pump, used to add liquid curing agent to the sample under the action of the peristaltic pump during sample preparation.

[0024] In some embodiments, the liquid curing agent is nano-silica sol.

[0025] Beneficial effects: Compared with the prior art, the sample preparation device for the hollow torsion shear apparatus for nano-silica sol-cured sand provided by this utility model has the following advantages:

[0026] (1) It realizes the function of preparing samples separately from the hollow torsion shear when solidifying sand and soil, thus avoiding instrument contamination caused by direct contact between the solidifying agent and the hollow torsion shear.

[0027] (2) It realizes the function of directly completing the integral molding of the sample in the rubber membrane required for the hollow torsion shear tester. The finished sample can be directly used for the test operation of the hollow torsion shear tester, which is highly practical.

[0028] (3) The nano-silica sol was able to penetrate the sand sample from bottom to top, which improved the saturation state and uniformity of the sample. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a three-dimensional structural diagram of the sample preparation device in an embodiment of this utility model;

[0031] Figure 2 This is a top view of the sample preparation device in an embodiment of this utility model;

[0032] Figure 3 This is a schematic diagram of the connection and nesting of the sample preparation device in an embodiment of this utility model;

[0033] Figure 4 This is a schematic diagram of the hollow fine-mesh mesh in an embodiment of this utility model;

[0034] Figure 5 This is a schematic diagram of the connection of the sample preparation device in an embodiment of this utility model.

[0035] In the figure: 1 Inner tube, 2 Outer tube, 3 Suction nozzle, 4 Sample cap, 5 Base, 6 Cylindrical nesting part, 7 Slot, 8 Foundation, 9 Support, 10 Through-hole, 11 First fillet, 12 Second fillet, 13 Peristaltic pump, 14 Rubber tube, 15 Liquid curing agent, 16 Rubber membrane, 17 Rubber ring, 18 Hollow fine mesh. Detailed Implementation

[0036] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this utility model or its application or use.

[0037] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may include different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0038] Example 1:

[0039] This embodiment provides a sample preparation device for a hollow torsion shear apparatus corresponding to nano-silica sol-cured sand, including as follows: Figure 1 The inner tube 1, outer tube 2, sample cap 4, and base 5 shown are hollow cylindrical structures.

[0040] like Figure 1 As shown, the bottom of the inner tube 1 is integrally connected to the base 5, the top of the inner tube 1 is nested and connected to the sample cap 4, and the bottom of the outer tube 2 is nested and connected to the base 5.

[0041] The inner tube 1 is covered with a rubber membrane 16. One end of the rubber membrane 16 is inserted into the base 5 and fixed to the base 5 by a rubber ring 17. The other end is flanged and wrapped around the top of the outer tube 2 for wrapping the sample during sample preparation.

[0042] The outer tube 2 is provided with a suction nozzle 3 in the middle, which is used to suck out the air between the outer tube 2 and the rubber membrane 16 during sample preparation, so that the rubber membrane 16 is attached to the inner surface of the outer tube 2.

[0043] In some embodiments, such as Figures 1 to 3 As shown, the base 5 includes a cylindrical nested part 6, a slot 7, a platform 8, a support 9, and a through-hole 10.

[0044] The cylindrical nested part 6 is nested and connected to the bottom of the outer tube 2, and its size is smaller than that of the support platform 8;

[0045] The bottom surface of the support 8 is integrally connected to the support 9, and the top surface is integrally connected to the cylindrical nested part 6. The size of the support 8 is larger than that of the outer tube 2, and it is used to support the nested outer tube 2 and the sample.

[0046] The side of the support platform 8 is provided with a slot 7. The rubber membrane 16 is fitted into the cylindrical nesting part 6 and fixed on the support platform 8 by the rubber ring 17. The slot 7 is used to limit the position of the rubber ring 17.

[0047] The supports 9 are configured in multiple and arranged in a ring array at the bottom of the base 5 to support the overall structure of the sample preparation device;

[0048] One or more through holes 10 are vertically formed on the base 5. The through holes 10 penetrate the base 5 from the vertical geometric center point and are connected to a rubber tube 14 for introducing liquid curing agent 15 into the soil during sample preparation.

[0049] In some embodiments, the upper end of the cylindrical nesting portion 6 is placed with a... Figure 4 The hollow fine mesh 18 shown is used to prevent sample sand from entering the through-hole 10.

[0050] In this embodiment, the hollow fine-pore mesh 18 is a hollow fine-pore nylon mesh.

[0051] In some embodiments, the through-hole 10 further includes a first rounded corner 11 at its bottom, which is used to ensure the airtightness of the device when connecting the rubber tube 14.

[0052] In some embodiments, the bottom of the outer tube 2 further includes a second rounded corner 12, which is used to nest and connect the outer tube 2 with the base 5.

[0053] In some embodiments, the inner tube 1 and the outer tube 2 are used to shape the prepared sample. The outer diameter of the inner tube 1 is the same as the inner diameter of the sample, and the inner diameter of the outer tube 2 is the same as the outer diameter of the sample. The space formed by the inner tube 1, the outer tube 2, the sample cap 4 and the base 5 after being connected and nested is the same as the required sample size.

[0054] In some embodiments, the inner tube 1, outer tube 2, sample cap 4, and base 5 are all made of transparent rigid material.

[0055] like Figure 5As shown, in some embodiments, one end of the rubber tube 14 extends into the through hole 10 via the first rounded corner 11, and the other end is connected to the pump outlet of the peristaltic pump 13, which is used to add liquid curing agent 15 to the sample under the action of the peristaltic pump 13 during the sample preparation process.

[0056] In this embodiment, the liquid curing agent 15 is a nano-silica sol.

[0057] Example 2:

[0058] This embodiment provides a sample preparation method for a hollow torsion shear apparatus corresponding to nano-silica sol-cured sand, using the sample preparation device for the hollow torsion shear apparatus corresponding to nano-silica sol-cured sand as described in Embodiment 1. The method includes:

[0059] S1. Place the hollow fine mesh 18 on the cylindrical nesting part 6, put the paper pattern rubber membrane 16 into the cylindrical nesting part 6, tighten one end with the rubber ring 17 and fix it in the slot 7, and nest the outer tube 2 on the support platform 8.

[0060] S2. Flip the other end of the sample preparation rubber membrane 16 that protrudes from the outer tube 2 and put it over the upper end of the outer tube 2. Suction out the air between the sample preparation rubber membrane 16 and the outer tube 2 from the suction nozzle 3 so that the sample preparation rubber membrane 16 is tightly attached to the inner wall of the outer tube 2.

[0061] S3. Connect the suction end of the peristaltic pump 13 to the liquid curing agent 15 with a rubber tube 14, and connect the pump outlet end of the peristaltic pump 13 to the through hole 10 with a rubber tube 14.

[0062] S4. Add the test sand layer by layer into the sample preparation rubber membrane 16 until the upper surface of the sand is flush with the upper end of the outer tube 2.

[0063] S5. Turn on the power of the peristaltic pump 13 to allow the liquid curing agent 15 to slowly and uniformly penetrate the sample from bottom to top. When the liquid curing agent 15 has penetrated to the top of the sample, keep the peristaltic pump 13 working for ten seconds until the top slightly overflows.

[0064] S6. Turn off the peristaltic pump 13, pull out the rubber tube 14 located at the through hole 10, immediately close the through hole 10, nest the sample cap 4 to the upper end of the inner tube 1, and keep the sample preparation device stationary before the liquid curing agent 15 cures.

[0065] S7. After curing, flip the sample preparation rubber membrane 16 at the top edge of the outer tube 2 back, slowly remove the outer tube 2 vertically, gently hold the middle of the sample preparation rubber membrane 16, slowly twist the base 5 as a whole, and then remove the base 5 and the inner tube 1 that is integrally connected to it.

[0066] The nano-curing agent used in this embodiment is nano-silica sol.

[0067] In the description of this disclosure / application, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to explain the relative positional relationship and movement between components in a specific orientation. If the specific orientation changes, the directional indication will also change accordingly. These terms are used only for the convenience of describing this disclosure / application and for simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure / application.

[0068] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this disclosure / application, unless otherwise stated, "a plurality of" means two or more.

[0069] In the description of this disclosure / application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art will understand the specific meaning of the above terms in this disclosure / application based on the specific circumstances.

[0070] The above description is only a preferred embodiment of this disclosure / application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this disclosure / application, and these improvements and modifications should also be considered within the protection scope of this disclosure / application.

Claims

1. A sample preparation device for hollow torsional shear apparatus of nanosilica sol solidified sand, characterized in that, It comprises an inner tube (1), an outer tube (2), a sample cover (4) and a base (5), and is in a hollow cylindrical structure, The bottom of the inner tube (1) is integrally connected with the base (5), and the top of the inner tube (1) is nestedly connected with the sample cover (4), and the bottom of the outer tube (2) is nestedly connected with the base (5). The outer part of the inner tube (1) is sleeved with a rubber film (16), one end of the rubber film (16) is sleeved into the base (5) and is fixed on the base (5) through a rubber ring (17), and the other end is folded and sleeved on the top of the outer tube (2) and is used for wrapping the sample during sample preparation. The middle part of the outer tube (2) is provided with a suction nozzle (3) for sucking out the air between the outer tube (2) and the rubber film (16) during sample preparation, so that the rubber film (16) is attached to the inner surface of the outer tube (2).

2. The sample preparation device for hollowed torsion shear test of nanosilica sol solidified sand according to claim 1, characterized in that, The base (5) comprises a cylindrical nesting part (6), a clamping groove (7), a bearing platform (8), a support (9) and a through-hole (10), The cylindrical nesting part (6) is nestedly connected with the bottom of the outer tube (2), and the size is smaller than the bearing platform (8); The bottom surface of the bearing platform (8) is integrally connected with the support (9), the top surface is integrally connected with the cylindrical nesting part (6), and the size is larger than the outer tube (2), which is used for supporting the nested outer tube (2) and the sample; The side surface of the bearing platform (8) is provided with a clamping groove (7), the rubber film (16) is sleeved into the cylindrical nesting part (6) and is fixed on the bearing platform (8) through the rubber ring (17), and the clamping groove (7) is used for limiting the position of the rubber ring (17); The support (9) is arranged in multiple and annular array at the bottom of the base (5), and is used for supporting the overall structure of the sample preparation device; One or more through-holes (10) are vertically arranged on the base (5), the through-holes (10) penetrate the base (5) from the vertical geometric center point, and are connected with a rubber tube (14), which is used for introducing liquid curing agent (15) into the soil during sample preparation.

3. The sample preparation device for hollowed-out torsion shear test of nanosilica sol solidified sand according to claim 2, characterized in that, The upper end of the cylindrical nesting part (6) is provided with a hollow fine mesh (18) for preventing the sample sand from entering the through-hole (10).

4. The sample preparation device for hollowed torsion shear test of nanosilica sol solidified sand according to claim 2, characterized in that, The through-hole (10) further comprises a first round corner (11) at the bottom, which is used to ensure the air tightness of the device when connecting the rubber tube (14).

5. The sample preparation device for hollowed-out torsion shear test of nanosilica sol solidified sand according to claim 2, characterized in that, The bottom of the outer tube (2) further comprises a second round corner (12), which is used to nest the outer tube (2) with the base (5).

6. The sample preparation device for hollowed-out torsion shear test of nanosilica sol solidified sand according to claim 1 or 2, characterized in that, The inner tube (1) and the outer tube (2) are used for shaping the prepared sample, the outer diameter of the inner tube (1) is the same as the inner diameter of the sample, and the inner diameter of the outer tube (2) is the same as the outer diameter of the sample.

7. The nanosilica sol solidified soil sample preparation device for hollowed-out torsion shear apparatus according to claim 1 or 2, characterized in that, The inner tube (1), the outer tube (2), the sample cover (4) and the base (5) are all transparent and hard materials.

8. The sample preparation device for hollowed-out torsion shear test of nanosilica sol solidified sand according to claim 4, characterized in that, One end of the rubber tube (14) extends into the through-hole (10) through the first round corner (11), and the other end is connected with the pump outlet end of the peristaltic pump (13), which is used for adding liquid curing agent (15) into the sample under the action of the peristaltic pump (13) during sample preparation.

9. The sample preparation device for hollowed-out torsion shear test of nanosilica sol solidified sand according to claim 8, characterized in that, The liquid curing agent (15) is nano silicon sol.

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