Rock point load test device with stable measurement

Abstract

The utility model discloses a stable measurement rock point load test device, which comprises an upper pressure head and a lower pressure plate which are oppositely arranged up and down, the upper pressure head is arranged in a loading frame, the lower end of the upper pressure head is conical, and the lower pressure plate is arranged in the loading frame through a loading assembly. The loading assembly is used for achieving movement of the upper pressing plate to the upper pressing head, and the loading frame is suspended in the supporting frame. The upper pressing head and the lower pressing plate are combined, so that the stability is good, and the deviation phenomenon occurring when an irregular rock block is tested is avoided; the telescopic foot rods are arranged at the bottom of the supporting frame, it is conveniently guaranteed that the supporting frame can be kept in a stable state on an uneven site, meanwhile, the supporting frame and the loading frame are installed in a ball head hoisting mode, it can be effectively guaranteed that rock blocks are in a horizontal state before and after being placed, and the stability of a test is further guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to rock mechanics testing device technical field, concretely relates to a rock point load test device of stable measurement. BACKGROUND

[0002] Rock point load test is a simple method for testing rock material mechanics parameters under point load, and is suitable for weathered rock, soft and broken rock and the like which are difficult to sample in indoor test, and solves the problem of rock mechanics strength determination which is not easy to prepare samples in conventional test. In the field of engineering site, such as expressway, railway tunnel, large water conservancy and hydropower hub engineering and geological disaster rescue and the like, point load test can quickly provide rock strength data, and provide important reference for engineering design and construction.

[0003] In order to facilitate rock point load test on site, the current point load tester has the advantages of light equipment, rapid data acquisition, sample without processing and the like, but the upper and lower pressure heads for breaking rock block in the existing point load tester are mostly conical, and due to irregular shape of natural rock block, the phenomenon of rock block deviation easily occurs under the loading of upper and lower conical pressure heads, thereby affecting test data, and if rock block is manually adjusted and clamped and fixed between upper and lower pressure heads before test, it leads to more tedious preparation work in early test stage; in addition, the tester is placed on site, but the ground of project site is not very flat, and the stability of rock block in the measuring process is affected. UTILITY MODEL CONTENT

[0004] The utility model provides a rock point load test device of stable measurement, which is not only convenient to carry, but also can stably place rock block during test, and avoids rock block deviation.

[0005] Therefore, the utility model adopts the technical scheme that a rock point load test device of stable measurement, which comprises upper and lower oppositely arranged upper pressure head and lower pressure plate, the upper pressure head is arranged in loading frame, and the lower end of the upper pressure head is arranged in conical shape, the lower pressure plate is arranged in loading frame through loading assembly, the loading assembly is used for realizing the movement of the upper pressure plate to the upper pressure head, and the loading frame is suspended in supporting frame.

[0006] As preferred in the above scheme, the loading frame comprises oppositely arranged loading top plate and loading bottom plate, at least two vertical columns are arranged between the loading top plate and the loading bottom plate, and the upper pressure head is arranged on the bottom surface of the loading top plate.

[0007] Further preferably, the loading assembly comprises a jack arranged below the lower pressure plate, a vertical guide rod is slidably arranged on the lower pressure plate, and the upper end of the guide rod is arranged on the upper end of the loading frame.

[0008] Further preferably, the lower pressing plate is provided with at least two opposite clamps for clamping the rock mass, the clamps comprising a fixed plate provided on the lower pressing plate and a horizontally arranged telescopic rod, and the end of the telescopic rod is provided with a contact pad.

[0009] Further preferably, the support frame comprises a support top block and a support bottom plate arranged oppositely, at least three support columns are arranged obliquely between the support top block and the support bottom plate, the bottom surface of the support bottom plate is provided with a plurality of telescopic foot rods, and a connecting piece is arranged between the upper end of the loading frame and the support top block, and when the loading frame is arranged in the support frame through the connecting piece, a distance is left between the bottom surface of the loading frame and the support bottom plate.

[0010] Further preferably, the lower end of the telescopic foot rod is tapered.

[0011] Further preferably, the connecting piece comprises a fixed segment at the upper end for connecting with the support top block and a ball head at the lower end for connecting with the loading frame, the upper end of the loading frame is provided with a mounting groove for slidingly mounting the ball head and a spherical limiting groove for preventing the ball head from moving out upwardly, and when the loading frame is mounted, the ball center of the ball head is located in the loading frame.

[0012] Further preferably, the upper pressing head is provided with a pressure sensor for testing pressure.

[0013] The beneficial effects of the present application are as follows:

[0014] 1) Compared with the structure of the upper and lower tapered pressing heads, the present application adopts the combination of the upper pressing head and the lower pressing plate, so that the rock mass can be placed conveniently, good stability is achieved, and the deviation phenomenon during the test on irregular rock mass is avoided, thereby ensuring the accuracy of data.

[0015] 2) The overall structure is simple, and the support frame and the loading frame can be detachably mounted, so that the support frame is convenient to carry; meanwhile, the telescopic foot rods are arranged at the bottom of the support frame, so that the stable state of the support frame on the uneven site can be ensured, and the ball head hoisting mounting mode is adopted between the support frame and the loading frame, so that the rock mass can be effectively ensured to be in a horizontal state before and after being placed, and the stability of the test is further ensured. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The present application is a schematic view.

[0017] Figure 2 is Figure 1 a top view.

[0018] Figure 3 is Figure 1 an enlarged perspective view of A in the figure.

[0019] Reference numerals: Support base plate-1, Support column-2, Support top block-3, Telescopic foot rod-4, Connector-5, Loading top plate-6, Upper pressure head-7, Column-8, Guide rod-9, Clamp-10, Lower pressure plate-11, Jack-12, Loading base plate-13. Detailed Implementation

[0020] The present invention will be further described below with reference to embodiments and accompanying drawings:

[0021] like Figures 1-3 As shown, a rock point load testing device for stable measurement mainly consists of an upper pressure head 7, a lower pressure plate 11, a loading frame, a loading assembly, and a support frame. The upper pressure head 7 and the lower pressure plate 11 are arranged vertically opposite each other. The upper pressure head 7 is located within the loading frame, and its lower end is tapered. The lower pressure plate 11 is positioned within the loading frame via the loading assembly, which enables the upper pressure plate 11 to move upwards towards the upper pressure head 7. The loading frame is suspended within the support frame.

[0022] The loading frame includes a loading top plate 6 and a loading bottom plate 13 arranged opposite each other. At least two columns 8 are provided between the loading top plate 6 and the loading bottom plate 13, and the upper pressure head 7 is provided on the bottom surface of the loading top plate 6. Preferably, four columns are arranged in a rectangle, and the upper pressure head is fixed on the bottom surface of the loading top plate.

[0023] The loading assembly includes a jack 12 positioned below the lower pressure plate 11. A vertical guide rod 9 is slidably mounted on the lower pressure plate 11, with its upper end positioned on the upper end of the loading frame, i.e., on the loading top plate. Preferably, the upper end of the guide rod is threadedly connected to the loading top plate, and the lower end of the guide rod passes through the lower pressure plate and is fitted with an anti-drop nut. A guide sleeve is provided between the guide rod and the lower pressure plate. Alternatively, the jack can employ other telescopic structures capable of pushing the lower pressure plate upwards, such as a telescopic cylinder.

[0024] To prevent the rock block from moving during the test, at least two opposing clamps 10 are provided on the lower pressure plate 11 for holding the rock block. Preferably, there are two clamps arranged opposite each other on the left and right sides. The clamp 10 includes a fixed plate provided on the lower pressure plate 11 and a horizontally arranged telescopic rod. The end of the telescopic rod is fitted with a contact pad, which prevents the telescopic rod from damaging the rock block. The telescopic rod allows the clamp to adapt to rock blocks of different sizes, and the telescopic rod can be set to be manually or electrically adjustable as needed.

[0025] The support frame includes a support top block 3 and a support bottom plate 1 arranged opposite each other. At least three support columns 2 are inclinedly arranged between the support top block 3 and the support bottom plate 1. Preferably, three support columns are arranged between the support top block and the support bottom plate, and both the support top block and the support bottom plate are provided with blind insertion holes for the support columns to be inclinedly inserted.

[0026] To facilitate the installation of the support base plate on uneven ground, several telescopic legs 4 are provided on the bottom surface of the support base plate 1. The telescopic legs can be adjusted manually or electrically as in the prior art. At the same time, for convenient support, the lower end of the telescopic legs 4 is tapered.

[0027] A connector 5 is provided between the supporting top block 3 and the upper end of the loading frame. When the loading frame is set in the supporting frame through the connector 5, there is a distance between the bottom surface of the loading frame and the supporting base plate 1, so that the loading frame is hoisted in the supporting frame.

[0028] To ensure the loading frame is level, connector 5 includes a fixed section at the upper end for connecting to the support block 3 and a ball head at the lower end for connecting to the loading frame. The upper end of the loading frame has an installation groove for the ball head to slide into and a spherical limiting groove to prevent the ball head from moving upwards. Both the spherical limiting groove and the installation groove are located on the loading top plate. After the loading frame is installed, the center of the ball head is located within the loading frame. Alternatively, the ball head of the connector can be configured as a ball joint, in which case the fixed section and the support block are connected by a threaded connection.

[0029] A pressure sensor for testing pressure is installed inside the upper pressure head 7 to directly obtain the rock strength.

[0030] Based on the above-mentioned test apparatus, a rock point load test method includes the following steps:

[0031] The first step is to assemble the sample apparatus. First, assemble the support frame, then hoist the loading frame into the support frame using connectors. Next, support the support frame on the ground using telescopic legs, and adjust the telescopic legs to keep the lower pressure plate horizontal.

[0032] Specifically, the following steps are taken: First, insert the support column at an angle into the top support block, then insert the support column into the bottom support plate, then install the telescopic legs under the bottom support plate, then install all the components in the loading frame, then slide the ball head into the mounting groove and lock it into the spherical limiting groove, and finally support the support frame on the ground with the telescopic legs. At the same time, adjust the telescopic legs to keep the lower pressure plate horizontal.

[0033] The second step is to conduct a test. Place the rock block in the middle of the lower pressure plate, ensuring that the rock block will not fall off. Then, fix the rock block with the clamps and start the jack to conduct the test.

Claims

1. A rock point load test device for stable measurement, characterized in that: It includes an upper pressure head (7) and a lower pressure plate (11) arranged opposite each other. The upper pressure head (7) is set inside the loading frame, and the lower end of the upper pressure head (7) is set in a conical shape. The lower pressure plate (11) is set inside the loading frame through a loading component. The loading component is used to realize the movement of the lower pressure plate (11) to the upper pressure head (7). The loading frame is suspended inside the support frame.

2. The rock point load test apparatus for stable measurement according to claim 1, characterized in that: The loading frame includes a loading top plate (6) and a loading bottom plate (13) arranged opposite to each other. At least two columns (8) are provided between the loading top plate (6) and the loading bottom plate (13). The upper pressure head (7) is provided on the bottom surface of the loading top plate (6).

3. The rock point load test apparatus for stable measurement according to claim 1, characterized in that: The loading assembly includes a jack (12) disposed below the lower pressure plate (11), and a vertical guide rod (9) is slidably disposed on the lower pressure plate (11), with the upper end of the guide rod (9) disposed on the upper end of the loading frame.

4. The rock point load test apparatus for stable measurement according to claim 3, characterized in that: The lower pressure plate (11) is provided with at least two opposing clamps (10) for clamping rock blocks. Each clamp (10) includes a fixed plate and a horizontally arranged telescopic rod on the lower pressure plate (11). The end of the telescopic rod is fitted with a contact pad.

5. The rock point load test apparatus for stable measurement according to claim 1, characterized in that: The support frame includes a support top block (3) and a support bottom plate (1) arranged opposite each other. At least three support columns (2) are inclinedly arranged between the support top block (3) and the support bottom plate (1). Several telescopic legs (4) are provided on the bottom surface of the support bottom plate (1). A connector (5) is provided between the support top block (3) and the upper end of the loading frame. When the loading frame is set in the support frame through the connector (5), there is a distance between the bottom surface of the loading frame and the support bottom plate (1).

6. The rock point load test apparatus for stable measurement according to claim 5, characterized in that: The lower end of the telescopic leg (4) is tapered.

7. The rock point load test apparatus for stable measurement according to claim 5, characterized in that: The connector (5) includes a fixed section at the upper end for connecting with the support block (3) and a ball head at the lower end for connecting with the loading frame. The upper end of the loading frame is provided with an installation groove for the ball head to slide into and a spherical limiting groove for preventing the ball head from moving upward. When the loading frame is installed, the center of the ball head is located inside the loading frame.

8. The rock point load test apparatus for stable measurement according to claim 1, characterized in that: The upper pressure head (7) is equipped with a pressure sensor for testing pressure.

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