Mold device for forming high polymer-concrete cylindrical sample

Abstract

The utility model discloses a mould device for forming a high polymer-concrete cylinder sample, which comprises a base, a side mould and a cover plate, the base is provided with two first bolt holes and a groove, a first rubber pad is attached in the groove, the side mould is placed on the upper portion of the groove, the side mould is composed of a first half mould and a second half mould, and the cover plate is arranged on the first half mould. Four bolt holes are formed in the periphery of the upper portion of the side die and used for being connected with the cover plate, second bolt holes are formed in the middle of the first half die and the middle of the second half die, the cover plate is provided with a grouting hole and a pressure release valve connector, a second rubber pad is embedded in a groove in the bottom of the cover plate, and four bolt holes are formed in the periphery of the cover plate. According to the utility model, molding of materials with high fluidity and easy expansion can be realized, grouting under different pressures can be carried out, samples with different densities can be obtained, and the problems of exosmosis and incapability of pressurization when an existing mold is used for molding high polymer materials are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of preparing penetration specimens, in particular to a mold device for molding polymer-concrete cylindrical specimens. Background Art

[0002] Joint leakage is a common hazard in shield tunnels, and grouting is a common treatment method for leaking water from joints. With the development and implementation of the green development concept, non-polluting polymer materials have been used for seepage prevention and plugging in various underground projects. Polymer-concrete interfaces in weak areas of anti-seepage exhibit excellent impermeability, leading to increasing research on the impermeability of polymer-concrete interfaces. For example, concrete impermeability testers are used to determine interfacial impermeability, but these instruments can only perform tests at room temperature and atmospheric pressure. For polymer materials that are sensitive to temperature, this testing instrument is clearly inadequate for testing. The Rock Top-50 HT multi-field coupled triaxial testing system can achieve these goals, but there are currently no commercially available polymer-concrete specimen molds suitable for this instrument. Conventional molds with a diameter of 50 mm and a height of 100 mm cannot be used to mold highly fluid materials or pressurize specimens of varying densities. Therefore, this paper presents a mold device for molding cylindrical polymer-concrete specimens. Utility Model Content

[0003] To address the problems of existing molds, this utility model provides a mold device for forming polymer-concrete cylindrical specimens. This device solves the problem of polymer material overflowing along the mold gaps or top during the specimen forming process, enabling the preparation of polymer specimens of varying densities. The mold comprises a base, side molds, and a cover plate. The base is connected to the cover plate via a first bolt that passes through the side molds, ensuring height accuracy and mold stability.

[0004] The side mold is divided into a first half mold and a second half mold. The bottom of the side mold is inserted into the base groove. The middle of the first half mold and the second half mold is provided with a second bolt hole for fastening the first half mold and the second half mold. The connection between the first half mold and the second half mold adopts a concave and convex curved surface connection, which can effectively prevent the slurry from overflowing. Four bolt holes are provided around the upper part of the side mold for connecting the cover plate. The top of the side mold is in a groove shape, which can effectively prevent the slurry from flowing out.

[0005] The cover plate is provided with a grouting hole and a pressure relief valve interface. The grouting hole is used to connect the grouting equipment, and polymer slurry is injected through this hole. The pressure relief valve interface is used to connect the pressure relief valve equipped with a pressure gauge. Four bolt holes are provided around the cover plate for connecting the base and the side mold.

[0006] Furthermore, a first rubber pad is installed within the base groove. This pad has good elasticity and can return to its original shape after deformation within a limited number of uses. This pad further prevents the polymer slurry from escaping through the gap between the base groove wall and the side mold. Ultimately, through multiple anti-seepage measures, no slurry leaks from the bottom of the mold.

[0007] Furthermore, second bolt holes are provided in the middle of each of the first and second mold halves. When the first and second mold halves are assembled, if a certain amount of horizontal pressure is not applied, the concave and convex surfaces of the joint alone cannot reliably prevent the liquid from leaking out. Using two second bolts to secure the first and second mold halves not only ensures a tight connection but also ensures the overall safety of the mold, ensuring the safety of those around it during pressure grouting.

[0008] Furthermore, a second rubber pad is embedded in the groove at the bottom of the cover. When the polymer slurry reaches a height of 100mm, it will spread outward. At this time, the second rubber pad prevents this process, ensuring that the slurry does not flow out of the gap on the top contact surface. The second rubber pad has the same performance as the first rubber pad at the base, but is thicker. Four bolt holes are set around the cover to connect the base and side molds, making the mold a whole and able to withstand a certain amount of pressure without damage.

[0009] Furthermore, when the grouting material does not expand and the grouting is normal, the cover plate may not be installed, so that the weight of the entire mold will be lighter and the operation during grouting will be more convenient. At this time, the mold can be used like an ordinary mold.

[0010] Furthermore, when the grouting material has poor fluidity, such as cement slurry, mortar, etc., the rubber pad on the base may not be placed, and the test piece may be directly cast based on the shape of the mold design.

[0011] A mold device for forming a polymer-concrete cylindrical specimen, the operation process includes the following steps:

[0012] S1. Pass the screw of the first bolt 4 through the first bolt hole 11 of the base 1 and place it on a horizontal surface;

[0013] S2. Place the first rubber pad 12 in the groove of the base 1;

[0014] S3. Align the first mold half 21 with the second mold half 22, then insert the second bolt 5 through the second bolt hole 211 to secure the first and second mold halves. Finally, insert the first bolt 4 through the third bolt hole at the top of the side mold 2 and place it in the groove of the base 1. Apply oil or vaseline to the inside of the mold to facilitate demolding.

[0015] S4. Pour half of the concrete into the mold, cover the mold with the cover plate 3, tighten the first bolts 4 on both sides, and then take the third bolt 6, pass it through the side mold and the cover plate, and tighten it to fix the top of the mold;

[0016] S5. Install the pressure relief valve, connect the grouting port 31 to the grouting equipment, and inject the polymer slurry.

[0017] S6. Wait for 6 hours for the slurry to solidify, remove the top bolts, take away the cover plate 3, take out the side mold 2, loosen the second bolt 5, separate the first half mold 21 and the second half mold 22, and then cure the sample.

[0018] The beneficial effects of the utility model are:

[0019] The contact surfaces of the various parts of this mold are designed as concave and convex joints, which can effectively prevent leakage. At the same time, anti-seepage rubber pads are installed at the bottom and top to meet the requirements of polymer molding without leakage. For materials with low viscosity and high fluidity, this mold can achieve the needs of molding samples of these materials.

[0020] For expansive materials, the utility model can form a closed space for preparing samples, solving the problem that existing molds cannot be used to prepare expansive material samples. At the same time, the utility model can pressurize the grouting slurry to prepare samples of different densities, which cannot be performed by existing molds. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the overall structure of the mold;

[0022] Figure 2 Schematic diagram of the base structure;

[0023] Figure 3 Schematic diagram of the side mold structure;

[0024] Figure 4 Schematic diagram of the half-mold structure;

[0025] Figure 5 Schematic diagram of the upper structure of the cover plate;

[0026] Figure 6 Schematic diagram of the bottom structure of the cover.

[0027] In the figure: 1 base, 12 first rubber pad, 2 side mold, 21 first half mold, 22 second half mold, 3 cover plate, 31 grouting hole, 32 pressure relief valve interface, 35 second rubber pad, 4 first bolt, 5 second bolt, 6 third bolt. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the drawings described below are only part of the implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0029] A mold device for forming polymer-concrete cylindrical specimens, see Figure 1-6 , including a base 1, a side mold 2, and a cover plate 3. The base 1 is provided with two first bolt holes 11 for passing the first bolts 4, and a first rubber pad 12 is provided in the groove to prevent the gap between the side mold 2 and the base 1 from overflowing the polymer slurry.

[0030] The side mold 2 consists of a first mold half 21 and a second mold half 22. A second bolt hole 211 is provided in the center of each mold half 21 and the two mold halves are secured together by a second bolt 5. A third bolt hole 212 for the first bolt 4 and a fourth bolt hole 213 for the third bolt 6 are provided at the top of each mold half 21 and the second mold half 22. The contact surface between the first and second mold halves 21 and 22 is designed as a concave-convex curved surface to further prevent leakage of the polymer slurry. The upper groove facilitates docking with the cover plate 3 and prevents slurry from overflowing from the top.

[0031] The cover plate 3 has an interface 32 for connecting to the pressure relief valve and a grouting hole 31 for grouting. A second rubber pad 35 is embedded in the groove at the bottom of the cover plate 3. This rubber pad has a certain degree of elasticity. When the bolts around the cover plate 3 are tightened, it is compressed to be flush with the bottom of the cover plate. The cover plate 3 has four bolt holes around its perimeter: a fifth bolt hole 33 for the first bolt 4 and a sixth bolt hole 34 for the third bolt 6.

[0032] The entire process of preparing polymer-concrete specimens includes the following steps:

[0033] S1. Pass the screw of the first bolt 4 through the first bolt hole 11 of the base 1 and place it on a horizontal surface;

[0034] S2. Place the first anti-seepage rubber pad 12 in the groove of the base 1;

[0035] S3. Align the first mold half 21 with the second mold half 22. Then, insert the second bolt 5 through the second bolt holes 211 of the first and second mold halves to secure the first and second mold halves. Finally, insert the top of the side mold 2 through the first bolt 4 and place it in the groove of the base 1. Apply oil or vaseline to the inside of the mold to facilitate demolding.

[0036] S4. Pour half of the concrete into the mold, cover the mold with the cover plate 3, tighten the first bolts 4 on both sides, and then take the third bolt 6, pass it through the side mold and the cover plate, and tighten it to fix the top of the mold;

[0037] S5. Install the pressure relief valve, connect the grouting port 31 to the grouting equipment, and inject the polymer slurry.

[0038] S6. Wait 6 hours for the slurry to solidify. Remove the first and third bolts 4 and 6, remove the cover plate 3, remove the side mold 2, loosen the second bolt 5, separate the first and second mold halves 21 and 22, and then perform curing on the specimen. For other grouting materials or pressure grouting, the slurry solidifies and solidifies for 6 hours. When the conditions for demolding are met, follow the above steps to remove the mold.

[0039] The above are only preferred embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the practical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A mold device for molding polymer-concrete cylindrical specimens, comprising a base (1), characterized in that: A first rubber pad (12) is provided in the groove of the base, and the base is provided with two first bolt holes (11); a side mold (2) is placed in the groove of the base, and a second bolt hole (211) is provided in the middle of the side mold for passing the second bolt (5); four bolt holes are provided around the upper part of the side mold for connecting the cover plate (3), which are respectively a third bolt hole (212) and a fourth bolt hole (213) for passing the first bolt (4) and the third bolt (6); the cover plate (3) is provided with a grouting hole (31) and a pressure relief valve interface (32); a second rubber pad (35) is embedded in the groove at the bottom of the cover plate (3); four bolt holes are provided around the cover plate (3), which are respectively a fifth bolt hole (33) and a sixth bolt hole (34) for passing the first bolt (4) and the third bolt (6).

2. A mold device for molding polymer-concrete cylindrical specimens according to claim 1, characterized in that: The base (1) is provided with a groove, a first rubber pad (12) is provided in the groove, the side mold (2) is placed in the groove, and the first rubber pad is used to prevent slurry from flowing out of the bottom gap.

3. A mold device for molding polymer-concrete cylindrical specimens according to claim 2, characterized in that: The side mold (2) comprises a first half mold (21) and a second half mold (22), wherein a second bolt hole (211) is provided in the middle of each of the first half mold (21) and the second half mold (22), and the first half mold (21) and the second half mold (22) are connected via a second bolt (5). A third bolt hole (212) and a fourth bolt hole (213) are provided on the upper portion of the side mold (2), for respectively passing the first bolt (4) and the third bolt (6).

4. The mold device for molding polymer-concrete cylindrical specimens according to claim 1, characterized in that: The cover plate (3) is provided with a grouting hole (31) and a pressure relief valve interface (32), wherein the grouting hole (31) is used to connect to the grouting equipment of the grouting vehicle, and the pressure relief valve interface is used to connect to the pressure relief valve equipped with a pressure gauge; The bottom of the cover plate (3) is provided with a groove, in which a second rubber pad (35) is embedded, extending 2 mm beyond the bottom plane of the cover plate, for preventing the top slurry from flowing out along the gap.

5. The mold device for molding polymer-concrete cylindrical specimens according to claim 4, characterized in that: The cover plate (3) is provided with a fifth bolt hole (33) and a sixth bolt hole (34) around its periphery, for respectively passing the first bolt (4) and the third bolt (6).

6. The mold device for molding polymer-concrete cylindrical specimens according to claim 1, characterized in that: The first bolt (4) passes through the base (1), the side mold (2) and the cover plate (3) to ensure the accuracy of the height direction and the stability of the mold. The second bolt (5) passes through the second bolt hole (211) to fasten the first half mold (21) and the second half mold (22) so that the side molds will not separate and the slurry will not overflow.

7. The mold device for molding polymer-concrete cylindrical specimens according to claim 1, characterized in that: The third bolt (6) passes through the side mold (2) and the cover plate (3) and is used to fix the top of the mold.

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