Rock-like multi-angle joint cylindrical test piece manufacturing mold

Abstract

The utility model discloses a manufacturing mold for a rock-like multi-angle joint cylindrical test piece, and relates to the technical field of mold manufacturing. Comprising a base, the base is of a cylindrical structure, and a base groove is downwards formed in the top face of the base; the bottom end of the cylinder body is arranged in the groove of the base; an annular track is formed in the top surface of the cylinder body; the number of the arc-shaped beams is at least two. An arc-shaped groove is formed in the bottom face of the arc-shaped beam, and a clamp is arranged in the arc-shaped groove in a sliding mode. The two ends of the arc-shaped beam are movably arranged on the annular track through movable assemblies. A joint simulation piece is arranged in the cylinder body, the bottom end of the joint simulation piece abuts against the base, and the top end of the joint simulation piece extends out of the cylinder body and is clamped and fixed through a clamp on the arc-shaped beam. When the manufacturing mold is used, the arc-shaped beam and the clamp are used for fixing the joint simulation piece, so that the joint can be positioned more accurately, and errors caused by deviation of the joint simulation piece when the joint simulation piece is inserted for vibration are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of mold manufacturing, in particular to a mold for manufacturing a cylindrical specimen with multi-angle joints of rock-like materials. Background Technique

[0002] With the rapid development of China's economy, rock mechanics problems have become increasingly prominent in various fields, such as tunnel engineering, underground mines, water conservancy and hydropower projects, etc. Understanding the fracture law of rocks is of great significance for predicting the stability of rock masses and preventing geological disasters. However, the fracture process of natural rocks is affected by various factors, such as joints, fissures, mineral particles, etc., making the prediction of rock fracture behavior extremely complex. Therefore, the research on the background technology of rock-like materials with multi-angle joints is of great significance; however, traditional model components cannot simulate the joints inside rocks from multiple angles.

[0003] This kind of model is simple and efficient to manufacture, and is more practical, convenient and economical compared with cutting natural rocks to make specimens.

[0004] However, at present, there is no preparation device that can prepare rock-like specimens with multi-angle joints, which has great disadvantages for the research on the multi-angle joint failure of rocks.

[0005] The existing patents can only simulate the situation where the joints are located at the center of the rock mass sample or other positions and the joint direction is vertically downward, and cannot simulate the situation where the joint direction has an inclined angle in the vertical direction, and the number and relative positions of the joints that can be simulated are limited. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a mold for manufacturing a cylindrical specimen with multi-angle joints of rock-like materials, so as to solve the problems existing in the above-mentioned prior art, and be able to overcome the difficulties that the joint angles of general rock-like joint manufacturing molds are limited, the number is limited, and rocks with complex joint forms cannot be manufactured and their mechanical properties cannot be tested, thereby helping to analyze and evaluate the safety risks in rock engineering and providing a scientific basis for the stability control and accident prevention of rock mass engineering.

[0007] To achieve the above purpose, the utility model provides the following solutions: The utility model provides a mold for manufacturing a cylindrical specimen with multi-angle joints of rock-like materials, including:

[0008] A base, the base is of a cylindrical structure, and a base groove is opened downward on the top surface of the base;

[0009] A cylinder body, the bottom end of the cylinder body is placed in the base groove; a circular track is opened on the top surface of the cylinder body;

[0010] Arc-shaped beams, with at least two arc-shaped beams provided; an arc-shaped groove is formed on the bottom surface of the arc-shaped beam, and a clamp is slidably arranged in the arc-shaped groove; both ends of the arc-shaped beam are movably arranged on the annular track through movable components;

[0011] A joint simulation sheet is arranged inside the cylinder body. The bottom end of the joint simulation sheet abuts against the base, and the top end of the joint simulation sheet extends out of the cylinder body and is clamped and fixed by the clamp on the arc-shaped beam.

[0012] Preferably, the arc-shaped beam is of a semi-circular arc structure, and the inner wall of the arc-shaped groove is rough.

[0013] Preferably, the movable component includes a sliding wheel. The sliding wheel is installed at the bottom of the movable seat through a fixed shaft. A plurality of connecting columns are fixedly installed at the top end of the movable seat, and the connecting columns are fixedly installed on the bottom surface of one side of the arc-shaped beam.

[0014] Preferably, the clamp includes a roller. The roller is arranged in the arc-shaped groove. Plug plates are fixedly installed at both ends of the roller. A connecting shaft is fixedly installed at the center of each plug plate. A wedge-shaped member is fixedly installed at one end of the connecting shaft extending into the roller; the end of the wedge-shaped member away from the connecting shaft is a smooth inclined surface; the two wedge-shaped members are symmetrically arranged with respect to the roller;

[0015] A connecting hole is further formed at the center of the side wall of the roller. A support column is installed in the connecting hole, and a clip is fixedly installed at the bottom end of the support column.

[0016] Preferably, an adjusting protrusion is formed in the middle of the support column; the top end of the support column is of a frustum structure and extends into the roller, and is in fit with the smooth inclined surfaces of the two wedge-shaped members.

[0017] Preferably, an installation ring is formed at the top end of the clip, and the bottom end of the support column is fixedly installed in the installation ring.

[0018] The following technical effects are disclosed by the present utility model: The present utility model can directly prepare a rock-like specimen with multiple joints at different angles, avoiding the complex process of using a drilling device to prepare the specimen, effectively improving the preparation efficiency of the specimen, and also improving its success rate.

[0019] When in use, the present production mold uses the arc-shaped beam and the clamp to fix the joint simulation sheet, which can make the joint positioning more accurate and avoid the error caused by the offset of the inserted joint simulation sheet during vibration. Description of the Drawings

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 Structural schematic diagram of the present invention;

[0022] Figure 2 Structural schematic diagram of the arc beam of the present invention;

[0023] Figure 3 Structural schematic diagram of the sliding wheel of the present invention;

[0024] Figure 4 Structural schematic diagram of the movable seat of the present invention;

[0025] Figure 5 Structural schematic diagram of the fixture of the present invention;

[0026] Figure 6 Cross-sectional view of the fixture of the present invention;

[0027] Figure 7 Schematic diagram of the cooperation between the arc beam and the fixture of the present invention;

[0028] Among them, 1. Arc beam; 2. Cylinder body; 3. Base; 4. Ring track; 5. Arc groove; 6. Sliding wheel; 7. Fixed shaft; 8. Movable seat; 9. Connecting column; 10. Drum; 11. Plug plate; 12. Wedge-shaped piece; 13. Support column; 14. Clip; 15. Adjusting protrusion. Specific embodiments

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0030] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0031] The present invention provides a mold for fabricating a cylindrical specimen with multi-angle joints similar to rock, including:

[0032] Base 3, the base is of a cylindrical structure, and a base groove is opened downward on the top surface of the base 3;

[0033] Barrel body 2, the bottom end of the barrel body 2 is placed in the base groove; a circular track 4 is opened on the top surface of the barrel body 2;

[0034] Arc-shaped beam 1, at least two arc-shaped beams 1 are provided; an arc-shaped groove 5 is opened on the bottom surface of the arc-shaped beam 1, and a clamp is slidably arranged in the arc-shaped groove 5; both ends of the arc-shaped beam 1 are movably arranged on the circular track 4 through movable components;

[0035] A joint simulation sheet is arranged in the barrel body 2, the bottom end of the joint simulation sheet abuts against the base 3, and the top end of the joint simulation sheet extends out of the barrel body 2 and is clamped and fixed by the clamp on the arc-shaped beam 1.

[0036] The arc-shaped beam 1 is of a semi-circular arc structure, and the inner wall of the arc-shaped groove 5 is rough.

[0037] The movable component includes a sliding wheel 6, the sliding wheel 6 is installed at the bottom of the movable seat 8 through a fixed shaft 7, a plurality of connecting columns 9 are fixedly installed at the top end of the movable seat 8, and the connecting columns 9 are fixedly installed on one side bottom surface of the arc-shaped beam 1.

[0038] In an embodiment of the present utility model, the sliding wheel 6 is movably arranged on the circular track 4.

[0039] The clamp includes a roller 10, the roller 10 is arranged in the arc-shaped groove 5, blocking plates 11 are fixedly installed at both ends of the roller 10, a connecting shaft is fixedly installed at the center of each blocking plate 11, and a wedge-shaped member 12 is fixedly installed at one end of the connecting shaft extending into the roller 10; the end of the wedge-shaped member 12 away from the connecting shaft is a smooth inclined surface; the two wedge-shaped members 12 are symmetrically arranged with respect to the roller 10;

[0040] A connecting hole is further opened at the center of the side wall of the roller 10, a support column 13 is installed in the connecting hole, and a clip 14 is fixedly installed at the bottom end of the support column 13.

[0041] An adjusting protrusion 15 is formed in the middle of the support column 13; the top end of the support column 13 is of a frustum structure and extends into the roller 10 and fits with the smooth inclined surfaces of the two wedge-shaped members 12.

[0042] An installation ring is formed at the top end of the clip 14, and the bottom end of the support column 13 is fixedly installed in the installation ring.

[0043] In an embodiment of the present utility model, as Figure 1 shown, two arc-shaped beams 1 are provided; the outer wall of the barrel body 2 fits with the inner wall of the base groove.

[0044] Furthermore, at least one clamp is provided on each arc-shaped beam 1.

[0045] Further, the fixture is respectively combined with the two arc-shaped beams 1 and clamps different joint simulation pieces to simulate various joints in natural rocks.

[0046] In an embodiment of the present utility model, the base 3 has a diameter of 70 mm and a thickness of 10 mm. The base groove on the base 3 has an inner diameter of 50 mm, an outer diameter of 56 mm, and a groove depth of 6 mm.

[0047] The barrel body 2 is a cylinder with a thickness of 6 mm, an inner diameter of 50 mm, and a height of 100 mm. An annular track 4 is provided along the upper edge of the cylinder.

[0048] The arc-shaped beam 1 has an inner diameter of 52 mm. Its cross-sectional shape is a hollow square tube with an opening on the inner side. The inner side is rough, the wall thickness is 2 mm, and the overall shape is a semi-circle with an inner diameter of 52 mm.

[0049] The fixture includes a roller 10 with a diameter of 8 mm. There are two wedge-shaped pieces 12 with connecting shafts inside the barrel body and are fixed in the roller 10 through a plug plate 11.

[0050] In an embodiment of the present utility model, taking the preparation of a rock-like cylindrical specimen with two joints as an example, where the roughness of the open single joint is 1, the opening degree is 2 mm, the width is 20 mm, the length is 50 mm, and the position is at the center of the rock-like specimen. The diameter of the rock-like specimen is 50 mm, and the height of the rock-like specimen is 100 mm. The specific operation steps of the mold made by using this device are as follows:

[0051] Step 1: Assemble the mold. The mold includes a base 3, a barrel body 2, two arc-shaped beams 1 with different sizes, a fixture that can slide on the arc-shaped beam 1, and a movable component for the arc-shaped beam 1 to slide on the barrel body 2.

[0052] First, evenly apply vaseline inside the base 3 and the barrel body 2 to ensure smooth demolding later. Place the barrel body 2 in the base groove and install the arc-shaped beam 1 on the movable component; then place the assembled arc-shaped beam 1 on the annular track 4.

[0053] Step 2: Model through CAD software and print joint simulation pieces using a 3D printing device. The width, roughness, and thickness are consistent with the geometric shape, roughness, and opening degree of the prefabricated joints.

[0054] In this embodiment, the width of the inserted piece is 20 mm, the roughness is 1, the thickness is 2 mm, the length is 50 mm, and the printing material of the joint simulation piece is water-insoluble polylactic acid; model through CAD software and print the corresponding cover plate using a 3D printing device. The thickness of the cover plate is 5 mm, and the tendency, dip angle, and roughness of the preset cracks in the cover plate are consistent with the tendency, dip angle, and roughness of the prefabricated joints.

[0055] In this embodiment, the inclination of the preset crack in the cover plate is 0°, the dip angle is 45°, the roughness is 1, the position is at the center of the rock-like specimen, and the 3D printing material of the cover plate is water-insoluble polylactic acid.

[0056] Step 3: Pour cement mortar into the mold and vibrate it thoroughly. The mix ratio of the cement mortar is cement: quartz sand: water = 1:2:0.45.

[0057] Step 4: Cover the cylindrical mold top surface with the cover plate containing the prefabricated crack.

[0058] Step 5: Apply vaseline on the outside of the joint simulation sheet, then insert it into the inside of the mold through the joint preset on the cover plate and fix it with the fixture on the arc beam 1.

[0059] Step 6: After 24 hours, pull out the joint simulation sheet. After the cement mortar is solidified and formed, remove the mold, and take out the cylindrical specimen and place it in a constant temperature and humidity box at a temperature of 20°C and a humidity of 95% for 28 days to obtain a rock-like cylindrical specimen with joints.

[0060] In another embodiment of the present utility model, a cover plate may also be provided on the barrel body 2, and the shape of the cover plate needs to fit the part of the joint simulation sheet extending out of the barrel body 2.

[0061] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present utility model.

[0062] The above-described embodiments are only descriptions of the preferred modes of the present utility model, and do not limit the scope of the present utility model. Without departing from the design spirit of the present utility model, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present utility model should fall within the protection scope determined by the claims of the present utility model.

Claims

1. A mold for making a rock-like multi-angle joint cylindrical specimen, characterized in that: include: A base (3), the base being a cylindrical structure, and a base groove is provided on the top surface of the base (3) facing downward; A barrel (2), wherein the bottom end of the barrel (2) is placed in the groove of the base; and a circular track (4) is provided on the top surface of the barrel (2); An arc-shaped beam (1), wherein at least two arc-shaped beams (1) are provided; an arc-shaped groove (5) is provided on the bottom surface of the arc-shaped beam (1), and a clamp is slidably arranged in the arc-shaped groove (5); and both ends of the arc-shaped beam (1) are movably arranged on the annular track (4) through movable components; A joint simulation piece is arranged inside the cylinder body (2), the bottom end of the joint simulation piece is in contact with the base (3), and the top end of the joint simulation piece extends out of the cylinder body (2) and is clamped and fixed by the clamp on the arc beam (1).

2. The mold for making a rock-like multi-angle joint cylindrical specimen according to claim 1, characterized in that: The arc-shaped beam (1) is a semicircular arc structure, and the inner wall of the arc-shaped groove (5) is rough.

3. The mold for making a rock-like multi-angle joint cylindrical specimen according to claim 1, characterized in that: The movable assembly comprises a sliding wheel (6), the sliding wheel (6) is mounted on the bottom of a movable seat (8) via a fixed shaft (7), a plurality of connecting columns (9) are fixedly mounted on the top of the movable seat (8), and the connecting columns (9) are fixedly mounted on the bottom surface of one side of the arc-shaped beam (1).

4. The mold for making a rock-like multi-angle joint cylindrical specimen according to claim 1, characterized in that: The clamp comprises a roller (10), the roller (10) is arranged in the arc-shaped groove (5), a blocking plate (11) is fixedly installed at both ends of the roller (10), a connecting shaft is fixedly installed at the center of the blocking plate (11), and a wedge-shaped piece (12) is fixedly installed at one end of the connecting shaft extending into the roller (10); the end of the wedge-shaped piece (12) away from the connecting shaft is a smooth inclined surface; the two wedge-shaped pieces (12) are symmetrically arranged about the roller (10); A connecting hole is also provided at the center of the side wall of the drum (10), a supporting column (13) is installed in the connecting hole, and a clip (14) is fixedly installed at the bottom end of the supporting column (13).

5. The mold for making a rock-like multi-angle joint cylindrical specimen according to claim 4, characterized in that: An adjusting protrusion (15) is formed in the middle of the support column (13); the top end of the support column (13) is a truncated cone structure and extends into the roller (10) to fit with the smooth inclined surfaces of the two wedge-shaped pieces (12).

6. The mold for making a rock-like multi-angle joint cylindrical specimen according to claim 5, characterized in that: The top end of the clamp (14) is formed with a mounting ring, and the bottom end of the support column (13) is fixedly mounted in the mounting ring.

Images