Freeze-thaw cycle test piece compaction device

Abstract

The utility model provides a compaction device for a freeze-thaw cycle test piece, and belongs to the field of compaction devices for freeze-thaw experiments. The utility model aims to solve the problem that the freezing and thawing experiment result deviates due to non-uniform stress when the existing test piece is subjected to layered compaction. Comprising an upper cover and a base which are connected through a stand column, a compaction barrel is arranged on the base, the outer wall of the upper side of a spinning rod is clamped in an annular sliding groove in the inner wall of a spinning rod penetrating opening through an annular sliding block, a pressing block assembly comprises a pressing block and a pressing block connecting rod, and a spinning rod connecting opening is formed in the upper end of the pressing block connecting rod; an axial limiting sliding block is arranged on the outer wall of the pressing block connecting rod. The spinning rod penetrates through the spinning rod penetrating opening and then is inserted into the spinning rod connecting opening, penetrating through the connecting rod penetrating opening, of the pressing block connecting rod in a connected mode through threads. The compaction force is controlled to be consistent as far as possible through the downward moving depth of the pressing block or the number of rotation turns of the spinning rod in the compaction process of each layer of soil sample, the stress is relatively uniform, the sample compaction effect is improved, and a good guarantee is provided for obtaining experimental data.

Description

Technical Field

[0001] The utility model relates to the technical field of freeze-thaw experiment compaction devices, and particularly relates to a freeze-thaw cycle specimen compaction device. Background Art

[0002] Frozen soil refers to soil (rock) with negative temperature or zero temperature and containing ice. The research on the freeze-thaw law of frozen soil plays a very important role and significance in road construction, agricultural production, and water resource prediction and evaluation. During the preparation of specimens, some factors will affect the mechanical property test of specimens. Regarding the compaction during the preparation of freeze-thaw cycle specimens, the traditional method is to use simple tools such as rammers for multiple-layer compaction. However, this method is prone to the disadvantages that the specimens in the same batch are unevenly stressed and the stress magnitudes of the specimens in the same batch are different, resulting in deviations in the experimental results. Therefore, it is necessary to design a specimen compaction device for geotechnical tests to ensure the uniformity of the compaction stress of specimens in the same batch and the consistency of the compaction stress of specimens in the same batch. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is:

[0004] To solve the problem that the deviation of the freeze-thaw experiment results is caused by uneven stress during the multi-layer compaction of existing specimens.

[0005] The technical solution adopted by the utility model to solve the above technical problem:

[0006] The utility model provides a freeze-thaw cycle specimen compaction device, which includes an upper cover, a base, a pressing block assembly and a spinning rod. The upper cover and the base are parallel and connected by columns at four corners. The compaction barrel is arranged at the center of the base. A limiting plate is arranged in parallel below the upper cover. A spinning rod through-hole is opened at the center of the upper cover. A connecting rod through-hole is opened at the center of the limiting plate. An annular sliding block is arranged on the outer wall of the upper side of the spinning rod. An annular sliding groove is arranged on the inner wall of the spinning rod through-hole. The annular sliding block is clamped in the annular sliding groove to enable the spinning rod to only rotate and not move up and down. The pressing block assembly includes a pressing block and a pressing block connecting rod. The pressing block is a cylinder. The pressing block is aligned with the barrel opening of the compaction barrel, and the diameter of the pressing block is the same as the inner diameter of the compaction barrel. A spinning rod connection port is opened at the upper end of the pressing block connecting rod. An axial limiting sliding block is arranged on the outer wall of the pressing block connecting rod. The shape of the connecting rod through-hole matches the cross-sectional shape of the pressing block connecting rod. After the spinning rod penetrates through the spinning rod through-hole, it is inserted into the spinning rod connection port of the pressing block connecting rod passing through the connecting rod through-hole and is connected by threads.

[0007] Furthermore, a compaction barrel limiting groove is arranged at the center of the upper end of the base, and the compaction barrel is arranged in the compaction barrel limiting groove.

[0008] Further, a handle is provided at the end of the spinning rod extending out of the upper cover.

[0009] Further, an arrow is provided on the handle, and a circular scale is provided at the outer edge of the outlet through which the spinning rod on the upper cover passes.

[0010] Further, a scale is provided on the outer wall of the pressing block.

[0011] Further, the limiting slider has an arc-shaped cross-section, the number of the limiting sliders is at least one, and they are circumferentially and evenly distributed on the outer wall of the pressing block connecting rod.

[0012] Further, the compaction barrel can be of a tubular structure.

[0013] Further, the compaction barrel includes at least two ring plates connected by a mortise and tenon structure at the edges to form an annular tubular structure.

[0014] Further, a limiting ring is sleeved outside the compaction barrel after being connected by a mortise and tenon.

[0015] Further, the pressing block includes at least two magnetically attracted pressing block units, and each pressing block unit is a cylinder with the same diameter.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0017] A freeze-thaw cycle specimen compaction device of the present utility model includes an upper cover and a base connected by columns. The compaction barrel is arranged on the base. The upper side outer wall of the spinning rod is clamped in the annular sliding groove on the inner wall of the outlet through which the spinning rod passes by an annular slider. The pressing block assembly includes a pressing block and a pressing block connecting rod. A spinning rod connection port is opened at the upper end of the pressing block connecting rod. An axial limiting slider is provided on the outer wall of the pressing block connecting rod. The spinning rod passes through the outlet through which the spinning rod passes and is inserted into the spinning rod connection port of the pressing block connecting rod passing through the through connecting rod outlet and is connected by a thread; by adding the same weight of soil samples for each layer, the downward movement depth of the pressing block or the number of rotation turns of the spinning rod during the compaction process is used to control the compaction force as much as possible to be consistent, the force is relatively uniform, the compaction effect of the specimen is improved, and a good guarantee is provided for obtaining experimental data. Description of the Drawings

[0018] Figure 1 is a perspective view of a freeze-thaw cycle specimen compaction device in an embodiment of the present utility model;

[0019] Figure 2 is a perspective view of the spinning rod and the pressing block assembly in an embodiment of the present utility model;

[0020] Figure 3 is a perspective view of the spinning rod in an embodiment of the present utility model;

[0021] Figure 4This is a perspective view of the pressing block assembly in the embodiment of the present utility model;

[0022] Figure 5 This is a perspective view of the limit plate in the embodiment of the present utility model;

[0023] Figure 6 This is a perspective view of the upper plate in the embodiment of the present utility model.

[0024] Explanation of reference numerals:

[0025] 1. Upper cover; 2. Column; 3. Base; 4. Compaction barrel; 5. Pressing block assembly; 6. Limit plate; 7. Handle; 8. Spinning rod; 9. Thread; 101. Spinning rod passing hole; 102. Annular chute; 103. Annular scale; 501. Pressing block; 502. Pressing block connecting rod; 503. Limit slider; 504. Spinning rod connection port; 601. Connecting rod passing hole; 701. Arrow; 801. Annular slider. Detailed implementation manners

[0026] In the description of the present utility model, it should be noted that the term nouns in each embodiment, such as "upper", "lower", "front", "rear", "left", "right", etc., which indicate directions, are only used to simplify the description of the positional relationship based on the drawings in the specification, and do not represent that the elements and devices referred to must operate according to the specific directions, limited operations, methods, and structures described in the specification. Such direction nouns do not constitute a limitation to the present utility model.

[0027] In order to make the above-mentioned objects, features, and advantages of the present utility model more obvious and understandable, the following detailed description of the specific embodiments of the present utility model will be given with reference to the drawings.

[0028] Specific implementation plan one: Combine Figures 1 to 6As shown in the figure, the utility model provides a compaction device for freeze-thaw cycle specimens, which includes an upper cover 1, a base 3, a pressing block assembly 5 and a spinning rod 8. The upper cover 1 and the base 3 are parallel and connected by columns 2 at four corners. A compaction barrel limiting groove is provided at the center of the upper end of the base 3, and a compaction barrel 4 is arranged in the compaction barrel limiting groove. A limiting plate 6 is arranged in parallel below the upper cover 1. A spinning rod through-hole 101 is opened at the center of the upper cover 1, and a connecting rod through-hole 601 is opened at the center of the limiting plate 6. An annular slider 801 is arranged on the outer wall of the upper side of the spinning rod 8, and an annular sliding groove 102 is arranged on the inner wall of the spinning rod through-hole 101. The annular slider 801 is clamped in the annular sliding groove 102 to enable the spinning rod 8 to only rotate and cannot move up and down. The pressing block assembly 5 includes a pressing block 501 and a pressing block connecting rod 502. The pressing block 501 is a cylinder. The pressing block 501 is aligned with the barrel mouth of the compaction barrel 4, and the diameter of the pressing block 501 is the same as the inner diameter of the compaction barrel 4. A spinning rod connection port 504 is opened at the upper end of the pressing block connecting rod 502. A limiting slider 503 in the axial direction is arranged on the outer wall of the pressing block connecting rod 502. The shape of the connecting rod through-hole 601 matches the cross-sectional shape of the pressing block connecting rod 502. After the spinning rod 8 passes through the spinning rod through-hole 101, it is inserted into the spinning rod connection port 504 of the pressing block connecting rod 502 passing through the connecting rod through-hole 601 and is connected by a thread 9.

[0029] A handle 7 is arranged at the end of the spinning rod 8 extending out of the upper cover 1. An arrow 701 is arranged on the handle 7. An annular scale 103 is arranged on the outer edge of the spinning rod through-hole 101 on the upper cover 1. When viewed from above, the number of rotation circles of each spinning can be read through the scale pointed by the arrow 701, so as to control the number of rotation circles during compaction of each layer and achieve the purpose of uniform compaction.

[0030] Scales are arranged on the outer wall of the pressing block 501, and the compaction force can be further controlled according to the depth of the pressing block 501 inserted into the compaction barrel 4, and the purpose of uniform compaction is achieved again. The scales are arranged on the pressing block 501 again because it is difficult to adjust the initial position of the pressing block 501 to the same horizontal plane every time when reading the number of rotation circles through the handle 7. The compaction force can be better controlled through the penetration depth of the pressing block 501.

[0031] The limiting slider 503 is a long strip-shaped structure with an arc-shaped or other cross-section. The number of the limiting sliders 503 is at least one, and they are circumferentially and evenly distributed on the outer wall of the pressing block connecting rod 502. Through the arrangement of the limiting sliders 503, it can be ensured that the pressing block 501 cannot rotate by itself and can only move up and down.

[0032] The compaction barrel 4 can be a tubular structure. During the compaction process, the compaction barrel 4 is clamped in the compaction barrel limit groove, and the bottom of the compaction barrel limit groove is used as the bottom of the compaction barrel 4. When the compaction is completed, the compaction barrel 4 is picked up, and then the specimen in the compaction barrel 4 is pushed out by the pressing block 501. Compared with the compaction barrel 4 with a bottom, the removal of the specimen is more convenient and easier to operate.

[0033] The compaction barrel 4 can also be formed by connecting at least two ring plates through tenon and mortise structures at the edges to form an annular tubular structure. After being connected by tenon and mortise, a limiting ring can be sleeved outside the compaction barrel 4 to play a further fixing role, which is convenient for installation and disassembly. The compacted specimen is easier to take out compared with the tubular compaction barrel 4 (not shown in the figure).

[0034] The pressing block 501 includes at least two magnetically attracted pressing block units, and each pressing block unit is a cylinder with the same diameter. The purpose of setting multiple pressing block units is to avoid the problem that the pressing block 501 is too long or too short and cannot achieve layered compaction.

[0035] Specific operation steps:

[0036] 1. Place the compaction barrel 4 in the compaction barrel limit groove on the base 3, weigh the mass of the first layer of soil sample to be compacted, and put it into the compaction barrel 4. Rotate the spinning rod 8. Since the spinning rod 8 does not move up and down, under the limit of the connecting rod passing hole 601, the pressing block 501 only moves up and down. When the bottom end face of the pressing block 501 is parallel to the upper end face of the compaction barrel 4, read and record the position where the arrow 701 on the handle 7 corresponds to the thread 9 on the upper cover 1 as the initial position n0. Rotate the spinning rod 8 to move the pressing block down until the spinning rod 8 cannot be rotated, and record the number of rotations n1 at this time. The zero scale on the outer wall of the pressing block 501 is at the top, and read the depth h1 at which the pressing block 501 enters. Complete the compaction of the first layer of soil sample, unscrew the pressing block 501 and perform shaving treatment on the first layer of soil sample;

[0037] 2. Weigh the second layer of soil sample and put it into the compaction barrel 4, and repeat the above operation. The initial position of the pressing block 501 is also n0. Record the second number of rotations as n2 and the depth h2 at which the pressing block 501 enters. In order to make the compaction force of the two times the same, it is required that n1 = n2 and h2 = 2h1. After completing the compaction of the second layer of soil sample, also perform shaving treatment on the second layer of soil sample;

[0038] 3. And so on. When compacting the third layer and the fourth layer of soil samples, n1 = n2 = n3 = n4, h3 = 3h1, h4 = 4h1. The preparation of a specimen compacted in four layers is completed. It is also possible to select appropriate layer heights and the number of layers according to experimental requirements;

[0039] 4. Remove the compaction barrel 4 from the base 3 and lift it upward. The sample in the compaction barrel 4 can be pushed out by using the pressing block 501, or the sample can be removed after disassembling the compaction barrel 4.

[0040] Although the present utility model is disclosed as above, the scope of protection of the present utility model is not limited thereto. Those skilled in the art of the present utility model can make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will all fall within the scope of protection of the present utility model.

Claims

1. A compaction device for freeze-thaw cycle specimens, characterized in that: It includes an upper cover (1), a base (3), a pressing block assembly (5) and a spinning rod (8). The upper cover (1) and the base (3) are parallel and connected by columns (2) at four corners. The compaction barrel (4) is arranged at the center of the base (3). A limiting plate (6) is arranged in parallel below the upper cover (1). A spinning rod through-hole (101) is opened at the center of the upper cover (1). A connecting rod through-hole (601) is opened at the center of the limiting plate (6). An annular slider (801) is arranged on the outer wall of the upper side of the spinning rod (8). An annular chute (102) is arranged on the inner wall of the spinning rod through-hole (101). The annular slider (801) is clamped in the annular chute (102) to enable the spinning rod (8) to only rotate and not move up and down. The pressing block assembly (5) includes a pressing block (501) and a pressing block connecting rod (502). The pressing block (501) is a cylinder. The pressing block (501) is aligned with the barrel opening of the compaction barrel (4), and the diameter of the pressing block (501) is the same as the inner diameter of the compaction barrel (4). A spinning rod connection port (504) is opened at the upper end of the pressing block connecting rod (502). An axial limiting slider (503) is arranged on the outer wall of the pressing block connecting rod (502). The shape of the connecting rod through-hole (601) matches the cross-sectional shape of the pressing block connecting rod (502). The spinning rod (8) passes through the spinning rod through-hole (101) and is inserted into the spinning rod connection port (504) of the pressing block connecting rod (502) passing through the connecting rod through-hole (601) and is connected by a thread (9).

2. The compaction device for freeze-thaw cycle specimens according to claim 1, wherein: A compaction barrel limiting groove is arranged at the center of the upper end of the base (3), and the compaction barrel (4) is arranged in the compaction barrel limiting groove.

3. A compaction device for freeze-thaw cycle test specimens according to claim 1, characterized in that: A handle (7) is arranged at the end of the spinning rod (8) extending out of the upper cover (1).

4. A compaction device for freeze-thaw cycle specimens according to claim 3, characterized in that: An arrow (701) is arranged on the handle (7), and an annular scale (103) is arranged on the outer edge of the spinning rod through-hole (101) on the upper cover (1).

5. A compaction device for freeze-thaw cycle test specimens according to claim 2 or 4, characterized in that: A scale is arranged on the outer wall of the pressing block (501).

6. The compaction device for freeze-thaw cycle test specimens according to claim 5, wherein: The limiting slider (503) has an arc-shaped cross-section. The number of the limiting sliders (503) is at least one, and they are circumferentially and evenly distributed on the outer wall of the pressing block connecting rod (502).

7. A compaction device for freeze-thaw cycle specimens according to claim 6, characterized in that: The compaction barrel (4) can be a tubular structure.

8. A compaction device for freeze-thaw cycle specimens according to claim 6, characterized in that: The compaction barrel (4) includes at least two ring plates connected by a mortise and tenon structure at the edges to form an annular tubular structure.

9. A compaction device for freeze-thaw cycle specimens according to claim 7, characterized in that: A limiting ring is sleeved outside the compaction barrel (4) connected by the mortise and tenon.

10. A compaction device for freeze-thaw cycle specimens according to claim 9, characterized in that: The pressing block (501) includes at least two magnetically attracted pressing block units, and each pressing block unit is a cylinder with the same diameter.

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