Multi-angle rock joint test piece manufacturing mold

Abstract

The utility model discloses a multi-angle rock joint test piece manufacturing mould, which relates to the technical field of moulds and comprises a left mould and a right mould which are identical in structure, the right mould is positioned on one side of the left mould, symmetrical rotatable discs are arranged on the left mould and the right mould on the device, rectangular holes are arranged on the discs, and the discs are rotated after thin copper sheets are inserted. Prepared rock-like material mortar is poured into the mold, rock-like joint test pieces with different angles are manufactured, molds with different dip angle cracks do not need to be prepared, and the research economic expenditure is reduced; meanwhile, the disc is fixed through the fixing mechanism, only one rotary knob needs to be rotated during operation, the operation of releasing disc fixing by a worker is simple, the disc on the device is fixed to a circular ring through cooperation of two first bolts and first bolt holes, the disc can be taken down from the device, and operation is convenient. And the device can also be provided with discs with rectangular holes of different sizes, so that the mold can be used for manufacturing rock-like joint test pieces with cracks of various sizes, and the practicability of the device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of molds, in particular to a mold for manufacturing multi-angle rock joint specimens. Background Technique

[0002] With the passage of time and under the action of external forces, joint cracks in jointed surrounding rock will crack, and cracks will generate, develop, connect and penetrate, resulting in macroscopic splitting cracks until the surrounding rock undergoes splitting failure. The occurrence of splitting failure destroys the integrity of the surrounding rock, causes the loss of bearing capacity, and even leads to a series of major accidents such as cave collapse. Therefore, the research on rock masses containing various forms of joints is of great significance.

[0003] Rock masses are usually obtained by on-site sampling. However, due to geological effects during the formation of rocks, the fissures in rocks are often uneven and discontinuous. To obtain regular intermittent joints will greatly increase the test cost. A large number of studies have shown that there are similarities in mechanical parameters between rock materials and rock-like materials. Therefore, many researchers use rock-like materials to simulate the mechanical parameters of rocks and form rock joint specimens with different dip angles by pouring. Usually, a rectangular hole is opened on the side of the mold, and then a thin copper sheet coated with vaseline lubricant is inserted. Then, the prepared rock-like material (cement, gypsum) mortar is poured in layers, and left standing for 4h - 6h. After the mortar solidifies, the pre-placed copper sheet is pulled out, and demolding is carried out after 24h, and a joint can be generated on the side of the rock joint specimen. However, the rectangular holes of this kind of mold are directly opened on the surface of the mold. Since the rock joints in nature have different dip angles, it is necessary to manufacture rock joint specimens with different angle cracks. However, the rectangular holes of this kind of mold are opened on the mold and cannot be rotated, resulting in the need to manufacture multiple molds, and the angles of the rectangular holes on the side of each mold are different. Therefore, to manufacture rock joint specimens with different angle cracks, multiple molds need to be prepared, resulting in a large economic expenditure for research. Therefore, the technical personnel in this field have proposed a mold for manufacturing multi-angle rock joint specimens. Content of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the utility model provides a mold for manufacturing multi-angle rock joint specimens. The rotation device provided by this mold solves the problem that the rectangular holes on the surface of the mold in the above background cannot be rotated and requires the preparation of multiple molds with a large economic expenditure.

[0005] To achieve the above purposes, the utility model is realized through the following technical solutions:

[0006] A multi-angle rock joint specimen manufacturing mold, comprising a left mold and a right mold with exactly the same structure. The right mold is located on one side of the left mold. The left mold and the right mold form a cylinder or cuboid with an open upper end and a closed lower end. The internal size of the cylinder is a diameter of 50 mm and a height of 100 mm. The internal size of the cuboid is length × width × height = 100 mm × 100 mm × 100 mm. Circular holes are provided on the sides of the left mold and the right mold. A rotating device is installed in each circular hole, and a fixing mechanism is provided below each rotating device. Four fixing supports are arranged in a rectangle near the edge of the mold side.

[0007] As a further technical solution of the present invention, the rotating device includes a ring rotatably installed in the circular hole. A disc is arranged in each of the rings. A rectangular hole is provided at the center of each disc. The length of the rectangular hole is 10 mm - 15 mm, and the width is 0.5 mm - 3 mm. Two first through holes are correspondingly provided on the side of each disc. A first bolt hole aligned with each first through hole is provided on the side of each ring at one side of each first through hole. A first bolt is arranged between each first through hole and the first bolt hole aligned with it.

[0008] As a further technical solution of the present invention, the fixing mechanism includes a mounting seat installed on the side of the mold and below the rotating device. A moving groove is provided on the upper surface of the mounting seat. A bidirectional screw is rotatably installed in the moving groove. A threaded seat adapted to the moving groove is arranged on each thread of the bidirectional screw. One end of the bidirectional screw extends outside the mounting seat and is installed with a knob. An L-shaped frame is installed on the upper surface of each threaded seat. An arc-shaped plate adapted to the side of the disc is installed at the upper end of each L-shaped frame.

[0009] As a further technical solution of the present invention, the fixing support includes four fixing plates installed in a rectangle near the edge of the side of the left mold. A fixed seat is installed on the side of the right mold at one side of the fixing plate. A second through hole is provided on each fixing plate. A second bolt hole aligned with the corresponding second through hole is provided on the side of each fixed seat at one side of the second through hole. A second bolt is arranged between each second through hole and the second bolt hole aligned with it.

[0010] Beneficial effects

[0011] The present invention provides a multi-angle rock joint specimen manufacturing mold. Compared with the prior art, it has the following beneficial effects:

[0012] 1. On the left and right molds of the device of the present utility model, there are symmetrically arranged rotatable discs. Rectangular holes are opened on the discs. A thin copper sheet is inserted into the rectangular hole on one side and extended to the rectangular hole on the other side. By rotating the disc, the thin copper sheet shows different angles inside the mold. Then, the stirred rock-like material is poured into the mold, and thus rock-like joint specimens with different angles can be produced. There is no need to prepare multiple molds, reducing the research economic expenditure. At the same time, a fixing mechanism is used to fix the disc. During operation, only one knob needs to be rotated, making the operation of releasing the fixation of the disc by the staff simple.

[0013] 2. The disc on the mold of the present utility model is fixed on its fixing ring through two first bolts cooperating with first bolt holes. By removing the first bolts, the disc can be taken off the device. Furthermore, discs with rectangular holes of different sizes can be installed on the device. Therefore, this mold can produce rock-like joint specimens with various sizes of cracks, increasing the practicality of the device.

[0014] 3. The mold provided by the present utility model has a simple structure, is reasonable and feasible. The preparation steps of the rock-like joint specimens using this mold are clear, and the preparation of specimens with different joint dip angles can be easily realized, achieving good application effects in the preparation process of multi-angle rock-like joint specimens in indoor tests. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of a mold for making multi-angle rock-like joint specimens;

[0016] Figure 2 It is a schematic diagram of the rotating device of a mold for making multi-angle rock-like joint specimens;

[0017] Figure 3 It is a schematic diagram of the fixing mechanism of a mold for making multi-angle rock-like joint specimens;

[0018] Figure 4 It is a schematic diagram of the disassembly of a mold for making multi-angle rock-like joint specimens;

[0019] Figure 5 It is a cross-sectional view of a mold for making multi-angle rock-like joint specimens;

[0020] Figure 6 It is a schematic structural diagram of a mold for making rock-like joint specimens with an inclination angle of 0°;

[0021] Figure 7 It is a schematic structural diagram of a mold for making rock-like joint specimens with an inclination angle of 45°.

[0022] In the figure: 1, left mold; 2, right mold; 3, rotating device; 31, circular ring; 32, disc; 33, rectangular hole; 34, first through hole; 35, first bolt hole; 36, first bolt; 4, fixing mechanism; 41, mounting seat; 42, moving groove; 43, bidirectional screw; 44, threaded seat; 45, knob; 46, L-shaped frame; 47, arc-shaped plate; 5, fixed support; 51, fixing plate; 52, fixed seat; 53, second through hole; 54, second bolt hole; 55, second bolt. Detailed implementation mode

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0024] Embodiment 1: Please refer to Figures 1-5 The technical solution of a multi-angle rock joint specimen production mold provided by the present invention:

[0025] As Figure 1 , Figure 5 shown, the mold is a cylindrical mold with an inner diameter of 50 mm and a height of 100 mm, including a left mold 1 and a right mold 2 with exactly the same structure. The right mold 2 is located on one side of the left mold 1. The left mold 1 and the right mold 2 form a cylinder with an open upper end and a closed lower end. Circular holes with a diameter of approximately 15 mm are provided on the sides of both the left mold 1 and the right mold 2. A rotating device 3 is installed in each circular hole, and a fixing mechanism 4 is provided below each rotating device 3. Four fixed supports 5 are arranged in a rectangle near the edge of the side of the mold.

[0026] As Figure 2As shown in the figure, the rotating device 3 includes a ring 31 rotatably mounted in the circular hole. A disc 32 is arranged in each ring 31. A rectangular hole 33 with a length of 12 mm and a width of 1 mm is provided at the center of each disc 32. Two first through holes 34 are correspondingly provided on the side surface of each disc 32. A first bolt hole 35 aligned with each first through hole 34 is provided on the side surface of each ring 31 on one side of each first through hole 34. A first bolt 36 is arranged between each first through hole 34 and the first bolt hole 35 aligned with it; according to the required size of the specimen joint fissure to be made, the disc 32 can be replaced. Unscrew the two first bolts 36 corresponding to the disc 32 on the left mold 1, then remove the disc 32 from the ring 31, then insert the disc 32 with rectangular holes 33 of different sizes into this ring 31, align the two first through holes 34 of the disc 32 with the two first bolt holes 35 of the ring 31, and then screw the first bolt 36 into the first through hole 34 and the first bolt hole 35 aligned with it. Similarly, since the structures of the left and right molds are exactly the same, the same operation can be performed on the disc on the right mold.

[0027] As Figure 3 As shown in the figure, the fixing mechanism 4 includes a mounting seat 41 installed on the side surface of the mold and below the rotating device 3. A moving groove 42 is provided on the upper surface of the mounting seat 41. A bidirectional screw 43 is rotatably installed in the moving groove 42. A threaded seat 44 adapted to the moving groove 42 is arranged on each thread of the bidirectional screw 43. One end of the bidirectional screw 43 extends outside the mounting seat 41 and is installed with a knob 45. An L-shaped frame 46 is installed on the upper surface of each threaded seat 44. An arc-shaped plate 47 adapted to the side surface of the disc 32 is installed at the upper end of each L-shaped frame 46; when clamping and fixing the disc 32, rotate the knob 45 to drive the bidirectional screw 43 to rotate, drive the two threaded seats 44 to approach each other, drive the two arc-shaped plates 47 to approach each other through the L-shaped frame 46 until the arc-shaped plate 47 completely contacts the disc 32 and can no longer rotate, then stop rotating the knob 45, thereby clamping and fixing the disc 32.

[0028] As Figure 4 As shown in the figure, the fixed support 5 includes four fixing plates 51 installed in a rectangular shape near the edge on the side surface of the left mold 1. Fixed seats 52 are installed on the side surface of the right mold 2 on one side of the fixing plates 51. A second through hole 53 is provided on each fixing plate 51. A second bolt hole 54 aligned with the corresponding second through hole 53 is provided on the side surface of each fixed seat 52 on one side of the corresponding second through hole 53. A second bolt 55 is arranged between each second through hole 53 and the second bolt hole 54 aligned with it; when disassembling the mold, unscrew the four second bolts 55 to release the fixation between the left mold 1 and the right mold 2, and separate the left mold 1 and the right mold 2. When assembling, align the second through hole 53 on the left mold 1 with the corresponding second bolt hole 54 on the right mold 2, and then screw the second bolt 55 into it to recombine the left mold 1 and the right mold 2.

[0029] Example 2: As Figure 2 and 3 shown, the size of the rectangular hole 33 on the disc 32 used is changed to a length of 10 mm and a width of 3 mm, and the remaining structure and dimensional parameters are the same as those in Example 1.

[0030] Example 3: As Figure 2 and 3 shown, the size of the rectangular hole 33 on the disc 32 used is changed to a length of 15 mm and a width of 0.5 mm, and the remaining structure and dimensional parameters are the same as those in Example 1.

[0031] Example 4: As Figure 1 shown, a mold for making multi-angle rock joint specimens is replaced with a cuboid mold with dimensions of length × width × height = 100 mm × 100 mm × 100 mm. As Figure 2 and 3 shown, the size of the rectangular hole 33 on the disc 32 used is a length of 12 mm and a width of 1 mm, and the remaining structure and dimensional parameters are the same as those in Example 1.

[0032] It should be noted that according to different requirements such as the size and position of the joint, the mold can be adjusted appropriately. In this embodiment, the size of the rectangular hole 33 on the disc 32 is a length of 12 mm and a width of 1 mm. According to actual needs, the disc 32 with rectangular holes 33 of different sizes (such as a length of 10 mm and a width of 3 mm) can be replaced, so that the mold can make joints of different sizes by replacing rectangular holes 4 of different sizes and inserting thin copper sheets of different sizes, increasing the practicality of the device; the left mold 1 and the right mold 2 of this device are combined into a cylinder, so that the rock joint specimens made are cylinders with a size of 50×100 mm, or the left mold 1 and the right mold 2 are changed to a cuboid of 100 mm × 100 mm × 100 mm, and other structures of the device remain unchanged, so as to make rectangular rock joint specimens.

[0033] Using the mold for making multi-angle rock joint specimens of the present utility model to prepare specimens is divided into the following steps:

[0034] Step (1): First, assemble the mold. Align each second through hole 53 with the corresponding second bolt hole 54, then screw the second bolt 55 into it, and then combine the left mold 1 and the right mold 2. Apply oil to the mold to facilitate the final demolding of the specimen. Then insert the rectangular thin copper sheet coated with vaseline lubricant into the rectangular hole 33 of the disc 32 on the left mold 1 and insert it out from the rectangular hole 33 of the disc 32 on the right mold 2. Then rotate the thin copper sheet. The rotating thin copper sheet drives the two discs 32 and the ring 31 to rotate until the thin copper sheet rotates to 0°, which is the angle between the thin copper sheet and the horizontal plane. As Figure 6As shown, then rotate the knob 45 to drive the rotation of the bidirectional screw 43, drive the two threaded seats 44 to approach each other, drive the two arc-shaped plates 47 to approach each other through the L-shaped frame 46, until the two arc-shaped plates 47 completely contact the disc 32 and cannot rotate, then stop rotating the knob 45, thereby clamping and fixing the disc 32;

[0035] Step (2): Pour and vibrate the prepared rock-like material mortar into the mold in layers, level the upper surface of the mold, let it stand for 4h - 6h, and after the mortar solidifies, pull out the pre-embedded copper sheet. Because vaseline lubricant is applied, it is convenient to pull out the thin copper sheet from the solidified specimen;

[0036] Step (3): Demold after standing for 24h, unscrew the four second bolts 55, then the fixation between the left mold 1 and the right mold 2 can be released, separate the left mold 1 and the right mold 2, and take out the specimen therein;

[0037] Step (4): Cure for 28d, the curing conditions are temperature (20 ± 2) °C and relative humidity ≥ 95%, and then polish with sandpaper to make the surface of the specimen smooth, then a rock-like specimen with joints can be obtained;

[0038] Step (5): Clean the inside of the mold, then recombine the left mold 1 and the right mold 2, align each second through-hole 53 with the corresponding second bolt hole 54, and then screw the second bolts 55 into them to recombine the left mold 1 and the right mold 2;

[0039] Step (6): Rotate the thin copper sheet to 45°, as Figure 7 shown, repeat the above steps (1) to (4), then a rock-like joint specimen with a joint dip angle of 45° can be obtained; similarly, rock-like joint specimens with different dip angles can be obtained;

[0040] Among them, when replacing the disc 32, unscrew the two corresponding first bolts 36 on the disc 32 of the left mold 1, then take down the disc 32 from the ring 31, then insert the disc 32 with different-sized rectangular holes 33 into this ring 31, align the two first through-holes 34 of the disc 32 with the two first bolt holes 35 of the ring 31, and then screw the first bolts 36 into each first through-hole 34 and the aligned first bolt hole 35. Then, the disc 32 of the right mold 2 is also replaced according to the above operation, so that the mold can make joints of different sizes by replacing different-sized rectangular holes 33 and inserting thin copper sheets of different sizes, increasing the practicability of the device.

[0041] The mold provided by the utility model has a simple structure, is reasonable and feasible. The fixing mechanism fixes the disc. During operation, only one knob needs to be rotated, making the operation of releasing the fixation of the disc by the staff simple. The method steps for preparing multi-angle rock joint specimens using this mold are clear, and the preparation of specimens with different joint inclinations can be easily achieved.

Claims

1. A mold for making multi-angle rock joint specimens, characterized in that: The invention comprises a left mold (1) and a right mold (2) of completely identical structure, wherein the right mold (2) is located on one side of the left mold (1), and the left mold (1) and the right mold (2) form a cylinder or a cuboid with an open upper end and a closed lower end, wherein the internal dimensions of the cylinder are a diameter of 50 mm and a height of 100 mm, and the internal dimensions of the cuboid are length×width×height=100 mm×100 mm×100 mm, and the sides of the left mold (1) and the right mold (2) are provided with circular holes, and a rotating device (3) is installed in each of the circular holes, and a fixing mechanism (4) is arranged below each of the rotating devices (3), and four fixing supports (5) are arranged in a rectangular shape near the edge of the mold side.

2. A multi-angle rock joint specimen production mold according to claim 1, characterized in that: The rotating device (3) comprises a circular ring (31) rotatably mounted in a circular hole, each of the circular rings (31) is provided with a circular disk (32), the center of each of the circular disks (32) is provided with a rectangular hole (33), the rectangular hole (33) is 10 mm-15 mm long and 0.5 mm-3 mm wide, two first through holes (34) are correspondingly provided on the side surface of each of the circular disks (32), a first bolt hole (35) aligned with the first through hole (34) is provided on the side surface of each of the circular rings (31), and a first bolt (36) is provided between each of the first through holes (34) and the first bolt hole (35) aligned with the first through hole (34), and a first bolt (36) is provided between each of the first through holes (34) and the first bolt hole (35) aligned with the first through hole (34).

3. The multi-angle rock joint specimen production mold according to claim 1 is characterized in that: The fixing mechanism (4) comprises a mounting seat (41) mounted on the side of the mold and located below the rotating device (3); a movable groove (42) is provided on the upper surface of the mounting seat (41); a bidirectional screw (43) is rotatably mounted in the movable groove (42); each thread of the bidirectional screw (43) is provided with a threaded seat (44) matched with the movable groove (42); one end of the bidirectional screw (43) extends to the outside of the mounting seat (41) and is installed with a knob (45); an L-shaped frame (46) is installed on the upper surface of each threaded seat (44); and an arc plate (47) matched with the L-shaped frame (46) is installed on the upper end of each L-shaped frame (46) on the side of the disc (32).

4. The multi-angle rock joint specimen production mold according to claim 1, characterized in that: The fixed support (5) comprises four fixed plates (51) installed in a rectangular shape near the edge of the side of the left mold (1), and a fixed seat (52) is installed on the side of the right mold (2) on one side of the fixed plate (51), each of the fixed plates (51) is provided with a second through hole (53), and each of the fixed seats (52) is provided with a second bolt hole (54) aligned with the second through hole (53) on the side corresponding to the second through hole (53), and a second bolt (55) is arranged between each of the second through holes (53) and the second bolt hole (54) aligned with the second through hole (53).

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