Sleeve mold for solidifying sandy soil sample

Abstract

The utility model relates to the technical field of geotechnical engineering sample preparation, and discloses a sleeve mold for solidifying a sandy soil sample, which is characterized in that a Teflon cloth cylinder structure is sleeved in a stainless steel sleeve, and the Teflon cloth cylinder structure is filled with the solidified sandy soil sample, so that the solidified sandy soil sample can be completely hooped by the stainless steel sleeve; the problem of sample swelling deformation caused by curing does not exist, the lateral liquid leakage phenomenon does not occur, and it is ensured that the bacterial liquid and the cementing liquid flow through the whole sample from top to bottom; wherein the stainless steel sleeve is resistant to high temperature and not prone to deformation, and after the stainless steel sleeve is dried, due to the high-temperature-resistant characteristic and the smooth surface characteristic of the Teflon cloth, the solidified sandy soil sample can be easily separated from the stainless steel sleeve, the standard and refined sample preparation target is achieved, and the test precision and reliability are improved.

Description

Technical Field

[0001] This utility model relates to the field of geotechnical engineering sample preparation technology, specifically a sleeve mold for solidifying sand samples. Background Technology

[0002] Microbial-induced calcium carbonate (MICP) precipitation is a novel, green, pollution-free, low-carbon, environmentally friendly, and widely applicable method for solidifying soil. It utilizes the biochemical reactions of microorganisms to secrete urease, which decomposes urea to produce carbonate ions, which then combine with calcium ions in the solution to form calcium carbonate. In today's increasingly low-carbon society, MICP-solidified soil applications are becoming more widespread, and research on MICP solidification of sandy soils is deepening. The mechanical research of solidified sand inevitably involves the dynamic and static mechanical studies of the soil, particularly dynamic triaxial, static triaxial, and unconfined compressive strength measurements. Unlike conventional triaxial specimen preparation, MICP-solidified sand sample preparation requires multiple rounds of repeated infiltration with the bacterial cementitious solution. After curing, it must be dried to constant weight, and multiple sets of specimens are prepared for testing at once. This necessitates that the sample preparation sleeve possess strong structural integrity, high reusability, accurate triaxial sample preparation, and minimal dimensional differences after sample molding. Furthermore, due to the expansion characteristics of the dried specimens, the sleeve should also facilitate demolding while ensuring specimen integrity and dimensional accuracy.

[0003] Currently, most sample preparation methods involve either cutting acrylic sleeves and then fixing them, or directly testing with plastic tubes made of materials such as PC and PVC. Cutting and fixing acrylic sleeves facilitates demolding, and integral PC / PVC sleeves are readily available and inexpensive. However, two problems exist: First, the cut and fixed acrylic sleeves undergo deformation, resulting in a non-standard circular inner diameter, poor component precision, and significant individual differences. Furthermore, the acrylic sleeves deform slightly during drying due to sample expansion, leading to severe deformation and breakage after repeated use. Second, PC and PVC sleeves are prone to deformation under heat, causing deformation during drying, which interferes with test results. After drying and molding, the complete sleeve needs to be cut, which disturbs the sample and damages some parts, affecting sample precision. Utility Model Content

[0004] In order to overcome the defects of the existing technology, the purpose of this utility model is to provide a sleeve mold for solidifying sand samples, so as to solve the technical problems of easy deformation of the sleeve and difficulty in demolding in the existing technology.

[0005] This utility model is achieved through the following technical solution:

[0006] A sleeve mold for solidifying sand samples includes a stainless steel sleeve and a Teflon cloth; the Teflon cloth is rolled to form a Teflon cloth cylindrical structure, which is fitted inside the stainless steel sleeve and connected to the inner wall of the stainless steel sleeve; the solidified sand sample is filled into the Teflon cloth cylindrical structure.

[0007] Preferably, the inner wall of the stainless steel sleeve is coated with a petroleum jelly coating, and the Teflon cloth cylindrical structure is attached to the petroleum jelly coating and connected to the inner wall of the stainless steel sleeve through the petroleum jelly coating.

[0008] Furthermore, the Teflon cloth cylindrical structure and the top two sides of the stainless steel sleeve are fixed with electrical waterproof tape.

[0009] Preferably, a connecting buckle is provided on the inner wall of the stainless steel sleeve along the circumferential direction of the cylinder. The Teflon cloth cylindrical structure is connected to the inner wall of the stainless steel sleeve after being connected to the connecting buckle by a connector.

[0010] Furthermore, the connector is a stainless steel thin sleeve structure formed by rolling stainless steel sheet, wherein the fluoropolymer cloth cylindrical structure is connected to the inner side of the stainless steel thin sleeve structure, and the outer side of the stainless steel thin sleeve structure is connected to the inner wall of the stainless steel sleeve through connecting buckles.

[0011] Furthermore, the outer side of the stainless steel thin sleeve structure is provided with a connecting slot along the axial direction of the cylinder. The stainless steel thin sleeve structure is connected to the inner wall of the stainless steel sleeve after a connecting buckle is inserted into the connecting slot.

[0012] Furthermore, magnetic patches are provided on both sides of the stainless steel sheet, and the stainless steel sleeve structure is formed by the magnetic patches on both sides attracting each other.

[0013] Furthermore, the inner wall of the stainless steel thin sleeve structure is coated with adhesive, and the fluoropolymer cloth cylindrical structure is adhered to the stainless steel thin sleeve structure by the adhesive.

[0014] Preferably, the two ends of the stainless steel sleeve are smooth.

[0015] Preferably, the length of the stainless steel sleeve corresponds to the length of the fluoropolymer cloth cylindrical structure.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects:

[0017] This invention provides a sleeve mold for solidifying sand samples. By fitting a Teflon cloth cylindrical structure inside a stainless steel sleeve, and filling the solidified sand sample inside the Teflon cloth cylindrical structure, the solidified sand sample can be completely contained by the stainless steel sleeve. There is no problem of sample expansion and deformation due to solidification, and no lateral leakage occurs. This ensures that the bacterial solution and cementing liquid flow through the entire sample from top to bottom. The stainless steel sleeve is heat-resistant and not easily deformed. After the stainless steel sleeve is dried, due to the heat-resistant properties and smooth surface of the Teflon cloth, the solidified sand sample can be easily removed from the stainless steel sleeve. This achieves the goal of standardized and refined sample preparation, improving the accuracy and reliability of the test.

[0018] Furthermore, the inner wall of the stainless steel sleeve is coated with petroleum jelly, and the Teflon cloth cylindrical structure is attached to the petroleum jelly coating and connected to the inner wall of the stainless steel sleeve through the petroleum jelly coating. Petroleum jelly is a transparent petroleum product with good lubricity. After coating the inner wall of the stainless steel sleeve with petroleum jelly, the friction between the stainless steel and the Teflon cloth cylindrical structure can be effectively reduced, making the connection between the two smoother, reducing wear, and facilitating demolding.

[0019] Furthermore, the Teflon cloth cylindrical structure and the stainless steel sleeve are fixed to the top two sides with electrical waterproof tape, which effectively improves the connection stability between the Teflon cloth cylindrical structure and the stainless steel sleeve.

[0020] Furthermore, a connecting buckle is provided on the inner wall of the stainless steel sleeve along the circumferential direction of the cylinder. After the Teflon cloth cylindrical structure is connected to the connecting buckle through the connector, it is connected to the inner wall of the stainless steel sleeve. The mechanical connection improves the connection stability between the Teflon cloth cylindrical structure and the stainless steel sleeve.

[0021] Furthermore, the connecting slot is set along the axial direction of the cylinder. When the connecting buckle is inserted, it not only provides radial fixing force, but also ensures the stability of the stainless steel thin sleeve structure in the axial direction.

[0022] Furthermore, by utilizing the magnetic attraction of the magnetic patches, stainless steel sheets can be quickly assembled into sleeve structures without the need for screws, bolts, or other complex connecting tools, greatly simplifying the assembly process and improving work efficiency.

[0023] Furthermore, the adhesive can tightly bond the fluoropolymer cylindrical structure to the inner wall of the stainless steel thin sleeve structure, forming a strong connection. This connection method is more secure than traditional mechanical fixing methods and is less prone to loosening or falling off.

[0024] Furthermore, the stainless steel sleeve has smooth edges at both ends to facilitate demolding and prevent burrs from scratching the sample. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the sleeve mold structure of Embodiment 1 of this utility model;

[0026] Figure 2 This is a schematic diagram of the structure of the petroleum jelly coating in Embodiment 1 of this utility model;

[0027] Figure 3 This is a schematic diagram of the solidified sand sample preparation structure in Embodiment 1 of this utility model;

[0028] Figure 4 This is a schematic diagram of the sleeve mold structure of Embodiment 2 of this utility model;

[0029] Figure 5 This is a schematic diagram of the unfolded state of the stainless steel sheet according to Embodiment 2 of this utility model;

[0030] In the picture: 1. Stainless steel sleeve; 2. Vaseline coating; 3. Teflon cloth; 4. Electrical waterproof tape; 5. Release rod; 6. Solidified sand sample; 7. Stainless steel sheet; 8. Connecting buckle; 9. Connecting slot; 10. Magnetic patch. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0032] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, system, product, or device that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, products, or devices.

[0033] The purpose of this invention is to provide a sleeve mold for solidifying sand samples, so as to solve the technical problems of easy deformation of the sleeve and difficulty in demolding in the prior art.

[0034] The present invention will now be described in further detail with reference to the accompanying drawings:

[0035] Example 1

[0036] In one embodiment of this utility model, a sleeve mold for solidifying sand samples is provided, including a stainless steel sleeve 1 and a Teflon cloth 3; the Teflon cloth 3 is rolled to form a Teflon cloth cylindrical structure, the Teflon cloth cylindrical structure is sleeved inside the stainless steel sleeve 1 and connected to the inner wall of the stainless steel sleeve 1; the solidified sand sample 6 is filled into the Teflon cloth cylindrical structure.

[0037] Specifically, according to Figure 1 and Figure 2 As shown, the inner wall of the stainless steel sleeve 1 is coated with a petroleum jelly coating 2, and the Teflon cloth cylindrical structure is attached to the petroleum jelly coating 2 and connected to the inner wall of the stainless steel sleeve 1 through the petroleum jelly coating 2.

[0038] The Teflon cloth cylindrical structure and the top two sides of the stainless steel sleeve 1 are fixed by electrical waterproof tape 4 respectively.

[0039] This embodiment provides a sleeve mold for solidifying sand samples. The manufacturing process of the sleeve mold is as follows:

[0040] Polish both ends of the stainless steel sleeve 1 with a file to smooth the inner edges of the top and bottom rings of the sleeve 1, and wipe the inner wall of the sleeve 1 clean. After evenly applying a thin layer of petroleum jelly coating 2 to the inner wall of the stainless steel sleeve 1, roll up the cut Teflon cloth 3 and place it inside the sleeve, allowing it to naturally expand and adhere to the petroleum jelly coating 2. Rotate and press along the inner wall of the stainless steel sleeve 1 with your fingers. Since the Teflon cloth 3 can effectively absorb petroleum jelly, it will fully adhere to the inner wall of the stainless steel sleeve 1. Press repeatedly on areas with air bubbles to remove them. Cut two pieces of electrical waterproof tape 4, one piece to be bonded to the joint of the Teflon cloth 3 and the outer edge of the top of the stainless steel sleeve 1, and the other piece to the joint end. Evenly apply petroleum jelly coating 2 to the Teflon cloth 3 to make a triaxial sleeve mold that can be used for MIP-cured sand samples. After MICP curing and drying, the cured sand sample 6, together with the stainless steel sleeve 1, is placed on the vertical release bar 5. The electrical waterproof tape 4 is peeled off, and the stainless steel sleeve 1 is pushed down. The cured sand sample 6, along with the Teflon cloth 3, is removed from the stainless steel sleeve 1, and the triaxial standard sample is completed.

[0041] according to Figure 3 As shown, in this embodiment, during demolding, the demolding rod 5 is aligned with the center of the solidified sand sample 6. Because the inner diameter of the stainless steel sleeve 1 is slightly larger than the size of the demolding rod 5, it can slide downwards along the demolding rod 5 under the lubrication of the petroleum jelly coating 2. The solidified sand sample 6, together with the Teflon cloth 3, is pushed out of the stainless steel sleeve 1 as a whole, completing the demolding.

[0042] In this embodiment, after the solidified sand sample 6 in the stainless steel sleeve 1 is dried, the Teflon cloth, due to its high-temperature resistance and smooth surface, can easily be removed from the stainless steel sleeve, achieving the goal of standardized and refined sample preparation and improving experimental accuracy and reliability. When drying the solidified sand sample 6 after MICP treatment, it can be placed together with the stainless steel sleeve in a 105°C environment for heating, greatly shortening the drying time and accelerating the experimental process. Both the stainless steel sleeve and the Teflon cloth can be reused, saving experimental costs and facilitating the simultaneous solidification of multiple sets of samples.

[0043] Example 2

[0044] This embodiment provides a sleeve mold for solidifying sand samples, including a stainless steel sleeve 1 and a Teflon cloth 3; the Teflon cloth 3 is rolled to form a Teflon cloth cylindrical structure, which is sleeved inside the stainless steel sleeve 1 and connected to the inner wall of the stainless steel sleeve 1; the solidified sand sample 6 is filled into the Teflon cloth cylindrical structure.

[0045] Specifically, according to Figure 4 As shown, a connecting buckle 8 is provided on the inner wall of the stainless steel sleeve 1 along the circumferential direction of the cylinder. The Teflon cloth cylindrical structure is connected to the inner wall of the stainless steel sleeve 1 after being connected to the connecting buckle 8 through a connector.

[0046] Among them, according to Figure 5 As shown, the connector is a stainless steel thin sleeve structure formed by rolling stainless steel sheet 7, wherein the fluoropolymer cloth cylindrical structure is connected to the inner side of the stainless steel thin sleeve structure, and the outer side of the stainless steel thin sleeve structure is connected to the inner wall of the stainless steel sleeve 1 through connecting buckle 8.

[0047] The stainless steel thin sleeve structure has a connecting slot 9 on the outer side along the axial direction of the cylinder. The stainless steel thin sleeve structure is connected to the inner wall of the stainless steel sleeve 1 after a connecting buckle 8 is inserted into the connecting slot 9.

[0048] The stainless steel sheet 7 has magnetic patches 10 on both sides, and the stainless steel sheet sleeve structure is formed by the magnetic patches 10 adsorbing each other.

[0049] The inner wall of the stainless steel thin sleeve structure is coated with adhesive, and the fluoropolymer cloth cylindrical structure is attached to the stainless steel thin sleeve structure by adhesive.

[0050] This embodiment provides a sleeve mold for solidifying sand samples. The manufacturing process of the sleeve mold is as follows:

[0051] Unfold the stainless steel sheet 7 to a flat state, ensuring that its surface is flat and free of wrinkles or damage.

[0052] Then, the Teflon cloth 3 is smoothly attached to the inner wall of the stainless steel sheet 7, ensuring a tight fit without air bubbles or gaps. The connection between the Teflon cloth 3 and the stainless steel sheet 7 can be achieved using [specific pasting methods or fixing techniques, such as adhesive bonding].

[0053] Utilizing the adsorption properties of the magnetic patch 10, the two sides of the stainless steel sheet 7 are attracted to each other, forming a cylindrical structure. During the adsorption process, it is important to check whether the adsorption is complete to ensure the integrity and stability of the entire structure.

[0054] The cylindrical body formed by the stainless steel sheet 7 is connected to the stainless steel sleeve 1 by connecting buckle 8 and connecting slot 9, ensuring a firm connection and accurate relative position between the cylindrical body formed by the stainless steel sheet 7 and the stainless steel sleeve 1.

[0055] The stainless steel sheet 7, through its connection with the stainless steel sleeve 1 and its own cylindrical structure, organically combines the various components into a unified functional unit. The connection method of the connecting buckle 8 and the connecting slot 9 ensures the structural stability between the stainless steel sheet 7 and the stainless steel sleeve 1, while the adsorption of the magnetic patch 10 ensures the formation and stability of the cylindrical structure of the stainless steel sheet 7.

[0056] In this embodiment, a stainless steel sheet 7 is added between the stainless steel sleeve 1 and the Teflon cloth 3. The stainless steel sheet 7 is unfolded into a flat state, which facilitates the laying of the Teflon cloth 3 on its inner side. The stainless steel sheet 7 forms a cylindrical structure by mutual attraction between the two sides of the magnetic patches 10. This design brings several benefits. First, it significantly improves assembly convenience. The flat state of the stainless steel sheet 7 makes the laying of the Teflon cloth 3 and its combination with other components easier, reducing assembly difficulty and time costs, and improving production efficiency. Second, the cylindrical structure formed by the stainless steel sheet 7 has a certain degree of flexibility. With the adsorption properties of the magnetic patches 10, it is more convenient to adjust or disassemble when needed, and it is also convenient for transportation and storage, saving space. Furthermore, the combination and interaction of the various components enable the structure to achieve diverse functions according to actual needs.

[0057] The connecting buckle 8 and connecting slot 9 connect the stainless steel sheet 7 and the stainless steel sleeve 1, ensuring the stability and integrity of the structure. This allows the entire structure to function stably and reliably during use, improving the product's quality and durability. In summary, Embodiment 2, through the optimization of components and structure, has achieved good results in assembly, use, functional implementation, and product performance, providing a more advantageous solution for practical applications.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of this utility model. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the protection scope of the claims of this utility model.

Claims

1. A sleeve mold for solidifying sand samples, characterized in that, It includes a stainless steel sleeve (1) and a Teflon cloth (3); the Teflon cloth (3) is rolled up to form a Teflon cloth cylindrical structure, which is fitted inside the stainless steel sleeve (1) and connected to the inner wall of the stainless steel sleeve (1); the solidified sand sample (6) is filled into the Teflon cloth cylindrical structure.

2. A sleeve mold for solidifying sand samples according to claim 1, characterized in that, The inner wall of the stainless steel sleeve (1) is coated with a petroleum jelly coating (2), and the Teflon cloth cylindrical structure is attached to the petroleum jelly coating (2) and connected to the inner wall of the stainless steel sleeve (1) through the petroleum jelly coating (2).

3. A sleeve mold for solidifying sand samples according to claim 2, characterized in that, The Teflon cloth cylindrical structure and the top two sides of the stainless steel sleeve (1) are fixed by electrical waterproof tape (4).

4. A sleeve mold for solidifying sand samples according to claim 1, characterized in that, The stainless steel sleeve (1) has a connecting buckle (8) along the circumferential direction of the cylinder on its inner wall. The Teflon cloth cylindrical structure is connected to the connecting buckle (8) through a connector and then connected to the inner wall of the stainless steel sleeve (1).

5. A sleeve mold for solidifying sand samples according to claim 4, characterized in that, The connector is a stainless steel thin sleeve structure formed by rolling a stainless steel sheet (7), wherein the fluoropolymer cylindrical structure is connected to the inner side of the stainless steel thin sleeve structure, and the outer side of the stainless steel thin sleeve structure is connected to the inner wall of the stainless steel sleeve (1) by a connecting buckle (8).

6. A sleeve mold for solidifying sand samples according to claim 5, characterized in that, The outer side of the stainless steel thin sleeve structure is provided with a connecting slot (9) along the axial direction of the cylinder. The stainless steel thin sleeve structure is connected to the inner wall of the stainless steel sleeve (1) after the connecting buckle (8) is inserted into the connecting slot (9).

7. A sleeve mold for solidifying sand samples according to claim 5, characterized in that, The stainless steel sheet (7) is provided with magnetic patches (10) on both sides, and the stainless steel sleeve structure is formed by the magnetic patches (10) on both sides adsorbing each other.

8. A sleeve mold for solidifying sand samples according to claim 5, characterized in that, The inner wall of the stainless steel thin sleeve structure is coated with adhesive, and the fluoropolymer cloth cylindrical structure is attached to the stainless steel thin sleeve structure by adhesive.

9. A sleeve mold for solidifying sand samples according to claim 1, characterized in that, The stainless steel sleeve (1) has smooth edges at both ends.

10. A sleeve mold for solidifying sand samples according to claim 1, characterized in that, The length of the stainless steel sleeve (1) corresponds to the length of the fluoropolymer cloth cylindrical structure.

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