Test piece forming device for semi-rigid base strength compressive strength test

Abstract

The invention belongs to the technical field of semi-rigid base layer compressive strength tests, and particularly relates to a test piece forming device for a semi-rigid base layer compressive strength test, which comprises a forming mold with a barrel-shaped structure and a static pressure assembly, a static pressure plate of the static pressure assembly is mounted at the inner top of the forming die and is penetrated by a mandrel, a static pressure conical cylinder is rotationally connected with the static pressure plate and a static pressure nail, and the static pressure nail is in threaded connection with the mandrel; and the static pressure nail applies continuous static pressure to the semi-rigid base mixture in the forming mold through the static pressure conical cylinder and the static pressure plate so as to form a static pressure formed test piece. The forming mold in the scheme has high compatibility and can be used in cooperation with different accessories, so that test pieces formed in different forming modes are obtained, for example, when the forming mold is used in cooperation with a static pressure assembly, the test pieces formed in a static pressure mode can be machined, and the compressive strength can be conveniently tested; in addition, the forming die of the scheme is simple in structure, small in occupied area, low in use cost and suitable for manufacturing test pieces in batches.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of semi-rigid base course compressive strength experiment, and particularly relates to a test piece forming device for semi-rigid base course compressive strength experiment. BACKGROUND

[0002] Semi-rigid base course materials are widely used in road engineering due to their high strength, good stability and low cost. As a key factor affecting the performance of semi-rigid base course, the forming method is directly related to the compactness, structural integrity and final compressive strength of the base course. Different forming methods apply different degrees of external force, resulting in differences in particle arrangement and cementation state within the semi-rigid base course, which in turn significantly affects its compressive strength. In-depth study of the influence of forming method on the compressive strength of semi-rigid base course is of great practical significance for optimizing construction technology and improving road engineering quality.

[0003] Different component formulations of semi-rigid base course materials have different structural strengths after being formed using different forming methods. The existing forming methods are mainly divided into static pressure forming, vibration forming and compaction forming. In the prior art, semi-rigid base course materials with the same components often require different molds and supporting equipment when making semi-rigid base course test pieces, resulting in significant differences in semi-rigid base course test pieces, making it difficult to determine the influence of the forming method, a single factor, on the compressive strength of the test piece.

[0004] Therefore, it is necessary to design a test piece forming device that can reduce the interference of other factors and form standard-shaped test pieces with different accessories. SUMMARY

[0005] To solve the above problems existing in the prior art, the present application provides a test piece forming device for semi-rigid base course compressive strength experiment.

[0006] The technical scheme adopted by the present application is as follows:

[0007] A test piece forming device for semi-rigid base course compressive strength experiment, comprising a forming mold and a static pressure assembly.

[0008] The forming mold comprises two mold halves; the two mold halves form a barrel-shaped structure with a barrel bottom and an open top after being closed; a tubular core shaft is arranged at the center of the barrel-shaped structure; the lower end of the core shaft is fixedly connected with a sealing disc, and the sealing disc is embedded in the barrel bottom of the barrel-shaped structure.

[0009] The static pressure assembly comprises a static pressure plate, a static pressure cone and a static pressure nail; the static pressure plate is installed on the inner top of the forming mold and is penetrated by the mandrel, the lower end of the static pressure cone is abutted with the static pressure plate, the upper end is rotationally connected with the cap end of the static pressure nail, and the threaded end of the static pressure nail is threadedly connected with the mandrel; the static pressure nail applies continuous static pressure on the semi-rigid base mixture in the forming mold through the static pressure cone and the static pressure plate, so as to form a static pressure formed test piece.

[0010] As an alternative or supplement to the above structure: further comprising a vertical pipe and a tamping weight; after the static pressure assembly is disassembled, the lower end of the vertical pipe is coaxially and threadedly connected to the upper end of the mandrel; the tamping weight is in the shape of a round cake and is sleeved outside the vertical pipe; the tamping weight reciprocally falls from a high place to impact the semi-rigid base mixture in the forming mold for multiple times, so as to form a tamping formed test piece.

[0011] As an alternative or supplement to the above structure: a magnetic attraction mechanism is arranged on the vertical pipe, the magnetic attraction mechanism comprises a threaded sleeve, a connecting arm and a seat ring; the seat ring is sleeved outside the vertical pipe, the threaded sleeve is arranged inside the vertical pipe and is threadedly connected with the lead screw; one end of the connecting arm is connected with the threaded sleeve, the other end extends out of the vertical slot on the vertical pipe and is connected with the seat ring; a second magnet is arranged at the bottom of the seat ring, a first magnet is arranged at the top of the tamping weight, when the first magnet and the second magnet are magnetically attracted, the rotation of the lead screw can drive the tamping weight to rise through the magnetic attraction mechanism; when the first magnet and the second magnet are disengaged, the tamping weight falls and impacts the semi-rigid base mixture.

[0012] As an alternative or supplement to the above structure: the magnetic attraction mechanism further comprises a plurality of radial sliders, the radial sliders are slidingly connected to the bottom of the seat ring and are annularly distributed; the second magnet is mounted on the radial slider, when the radial slider slides radially, the first magnet and the second magnet are opposite or misaligned, so as to realize mutual magnetic attraction or disengagement.

[0013] As an alternative or supplement to the above structure: the radial slider is in the shape of a long strip, a plurality of second magnets are arranged along the length direction of the radial slider, the magnetic poles of adjacent second magnets face opposite directions; the second magnet corresponds to the first magnet arranged at the top of the tamping weight one by one, the magnetic poles of adjacent second magnets face opposite directions.

[0014] As an alternative or supplement to the above structure: a release mechanism is arranged on the vertical pipe and is fixed by a pin, the release mechanism comprises a conical block, the lower end of the conical block is conical, when the magnetic attraction mechanism rises to the release mechanism, the conical block cooperates with the inclined surface of the radial slider and pushes the radial slider to slide in the radial direction.

[0015] As an alternative or supplement to the above structure: a fixed disc is connected to the outside of the upper end of the conical block, a guide rod is slidingly connected to the edge of the fixed disc, a thrust ring is fixedly connected to the lower end of the guide rod, and a compression spring is sleeved outside the guide rod and abuts against the thrust ring and the fixed disc at both ends.

[0016] As an alternative or supplement to the above structure: the lead screw is connected to the rotor of the lifting motor through a coupling.

[0017] As an alternative or supplement to the above structure: the test piece forming device further comprises a vibrating platform; the vibrating platform comprises an upper platform, a lower platform and elastic pads; the upper platform is connected to the lower platform through a plurality of elastic pads; a vibrator is installed on the lower surface of the upper platform; the forming mold is fixed on the upper surface of the upper platform through bolts; after the static pressure assembly is disassembled, the vibrator is powered on to vibrate the semi-rigid base layer mixture in the forming mold, thereby forming a vibrated test piece.

[0018] As an alternative or supplement to the above structure: the upper platform is threadedly connected with a jacking nail, and when the lower end of the jacking nail abuts against the lower platform, the locking of the vibrating platform is realized; the vibrator has a plurality of vibrators distributed in a ring shape; the rotors of the vibrators all face the center of the upper platform.

[0019] The forming mold in the scheme has high compatibility and can be used with different accessories to obtain test pieces formed by different forming modes, for example, when used with the static pressure assembly, the static pressure formed test piece can be machined to facilitate the compression strength test; in addition, the forming mold has simple structure, small footprint and low use cost, and can be suitable for batch test piece manufacturing. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiment of the scheme or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced.

[0021] Figure 1 is a structural schematic view of the forming mold;

[0022] Figure 2 is a structural view of the forming mold cooperating with the static pressure assembly;

[0023] Figure 3 is a structural view of the forming mold, the tamping weight, the magnetic attraction mechanism and the release mechanism;

[0024] Figure 4 is a sectional view of the forming mold, the tamping weight, the magnetic attraction mechanism and the release mechanism;

[0025] Figure 5 is a structural view of the forming mold, the tamping weight and the magnetic attraction mechanism;

[0026] Figure 6 is a structural view of the tamping weight and the magnetic attraction mechanism;

[0027] Figure 7It is a structural diagram showing the coordination of the compaction weight, magnetic attraction mechanism, and release mechanism;

[0028] Figure 8 This is a structural diagram showing the combination of the vibration platform and the molding die;

[0029] Figure 9 This is a schematic diagram of the vibration platform.

[0030] Figure 10 This is a distribution diagram of the vibrators;

[0031] Figure 11 It is a structural diagram showing the coordination of the vibration platform, forming mold, compaction weight, magnetic attraction mechanism, and release mechanism.

[0032] In the diagram: 1-Vibration platform; 11-Lower platform; 12-Elastic pad; 13-Upper platform; 14-Tightening pin; 15-Vibrator; 2-Lifting motor; 21-Coupling; 22-Screw; 4-Forming mold; 41-Mold piece; 42-Mandrel; 43-Sealing disc; 5-Compacting weight; 51-First magnet; 6-Magnetic attraction mechanism; 61-Threaded sleeve; 62-Connecting arm; 63-Seat ring; 64-Radial slider; 7-Vertical tube; 8-Release mechanism; 81-Conical block; 82-Fixing disc; 83-Compression spring; 84-Thrust ring; 85-Guide rod; 9-Hydrostatic pressure assembly; 91-Hydrostatic pressure plate; 92-Hydrostatic pressure cone; 93-Hydrostatic pressure pin. Detailed Implementation

[0033] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are only a part of the embodiments, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments in this solution without creative effort are within the protection scope of this solution.

[0034] Example 1

[0035] like Figure 1 As shown in the figure, this embodiment designs a specimen molding device for testing the compressive strength of semi-rigid base layers, including a molding mold 4.

[0036] The molding die 4 in this embodiment includes two die segments 41, a mandrel 42, and a sealing disc 43. The two die segments 41, when closed, form a barrel-shaped structure with a bottom and an open top. A tubular mandrel 42 is positioned at the center of the barrel-shaped structure; the lower end of the mandrel 42 is fixedly connected to the sealing disc 43, which is embedded in the bottom of the barrel-shaped structure. A semi-circular groove is provided at the bottom of the die segments 41, into which the sealing disc 43 is inserted. The sealing disc 43 improves the sealing performance of the bottom of the molding die 4 and simultaneously secures the mandrel 42, ensuring that the mandrel 42 remains stably centered in the molding die 4 when subjected to tension or pressure. The upper end of the mandrel 42 has an internal thread for external threaded connection.

[0037] Example 2

[0038] like Figures 1-2 As shown, this embodiment designs a specimen molding device for testing the compressive strength of semi-rigid base layers, which is used to make specimens using a static pressure molding method, including a molding mold 4 and a static pressure component 9.

[0039] The molding die 4 adopts the structure in Example 1.

[0040] The static pressure assembly 9 includes components such as a static pressure plate 91, a static pressure cone 92, and a static pressure nail 93.

[0041] The static pressure plate 91 is installed on the inner top of the molding die 4 and passes through the mandrel 42. Serrations are provided on the outer and inner edges of the static pressure plate 91 to facilitate the venting of the semi-rigid base mixture through the tiny gaps formed between the serrations. The lower end of the static pressure cone 92 abuts against the static pressure plate 91, and the upper end is rotatably connected to the cap end of the static pressure nail 93. When the static pressure nail 93 moves downward, it can drive the static pressure cone 92 downward, thereby pressing against the static pressure plate 91.

[0042] The threaded end of the static pressure nail 93 is threadedly connected to the upper end of the mandrel 42; the static pressure nail 93 applies continuous static pressure to the semi-rigid base mixture in the molding die 4 through the static pressure cone 92 and the static pressure plate 91 to form a statically pressed specimen.

[0043] In this embodiment, when the molding mold 4 and the static pressure component 9 are used together: the uniformly mixed semi-rigid base material is loaded into the molding mold 4, the static pressure component 9 is installed into the molding mold 4, and the static pressure nail 93 is rotated using a torque wrench. When the preset pressure value matches the torque of the torque wrench, it can be determined that the pressure of the static pressure component 9 on the semi-rigid base material meets the actual requirements.

[0044] Selection of test materials for semi-rigid base course mixtures:

[0045] Cement (as semi-rigid base layer): P.O 42.5 grade ordinary portland cement is selected, and each performance index meets the national standard.

[0046] Aggregate: including limestone crushed stone and stone chips, the gradation meets the specification requirements, and the crushing value, needle flake content and other indexes meet the technical requirements of aggregate for road base.

[0047] Water: ordinary drinking water is used for mixing of the mixture.

[0048] Mixing ratio design: according to the specification requirements, the mixing ratio of cement stabilized crushed stone mixture is designed, the cement dosage is 5%, and the target compaction degree is 98%.

[0049] Example 3

[0050] As shown in Figures 3-7 , the embodiment designs a specimen forming device for strength and compressive strength test of semi-rigid base layer, which is used for manufacturing the specimen by using the method of impact compaction forming, and includes a forming mold 4, a vertical pipe 7, a magnetic attraction mechanism 6 and an impact compaction weight 5.

[0051] The forming mold 4 adopts the structure in example 1; or the structure in example 2 can be adopted, and the static pressure assembly 9 is detached.

[0052] The vertical pipe 7 is a vertically arranged hollow pipe, and the lower end of the vertical pipe 7 is provided with external threads so as to be coaxially screwed to the upper end of the mandrel 42. Long strip-shaped holes are arranged on the left and right walls of the vertical pipe 7.

[0053] The impact compaction weight 5 is in the shape of a round cake and is sleeved outside the vertical pipe 7; when the impact compaction weight 5 falls from a high place back and forth, the impact compaction weight 5 can fall and impact the semi-rigid base layer mixture under the action of gravity, and after multiple impacts on the semi-rigid base layer mixture in the forming mold 4, the specimen can be manufactured in the manner of impact compaction forming.

[0054] The magnetic attraction mechanism 6 is arranged on the vertical pipe 7, and comprises a threaded sleeve 61, a connecting arm 62, a seat ring 63, a radial slider 64 and the like. The seat ring 63 is sleeved on the outer side of the vertical pipe 7, and a large gap is formed between the inner ring side of the seat ring 63 and the side wall of the vertical pipe 7. The threaded sleeve 61 is arranged in the vertical pipe 7 and is threadedly connected with the lead screw 22. One end of the connecting arm 62 is connected with the threaded sleeve 61, and the other end extends out of the vertical slot on the vertical pipe 7 and is connected with the seat ring 63. When the lead screw 22 is controlled to rotate by the lifting motor 2, the threaded sleeve 61 can be controlled to move up and down, and the connecting arm 62 and the seat ring 63 also move up and down. A second magnet is arranged at the bottom of the seat ring 63, and a first magnet 51 is arranged at the top of the tamping weight 5. When the first magnet 51 and the second magnet are magnetically attracted, the tamping weight 5 can be lifted by the magnetic attraction mechanism 6 when the lead screw 22 rotates. When the first magnet 51 and the second magnet are separated from each other, the tamping weight 5 falls and impacts the semi-rigid base layer mixture.

[0055] The radial slider 64 is connected to the bottom of the seat ring 63 and can slide radially. A plurality of radial sliders 64 are arranged in a ring shape, and the end of the radial slider 64 extends beyond the seat ring 63 and extends to the vertical pipe 7. The second magnet is installed on the radial slider 64. When the radial slider 64 slides radially, the first magnet 51 and the second magnet can move from a position facing each other to a position offset from each other, so that the first magnet 51 and the second magnet change from a magnetically attracted state to a separated state. When the magnetic force between the two cannot support the weight of the tamping weight 5, the tamping weight 5 can fall under the action of gravity and impact the semi-rigid base layer mixture. A third magnet can be arranged on the seat ring 63, and the number of the third magnet corresponds to the number of the radial slider 64. The third magnet can repel the second magnet of the radial slider 64, so as to reset the radial slider 64.

[0056] The radial slider 64 is in a long strip shape, and a plurality of second magnets are arranged along the length direction thereof. The magnetic poles of adjacent second magnets face in opposite directions. The second magnet corresponds to the first magnet 51 arranged at the top of the tamping weight 5, and the magnetic poles of adjacent second magnets face in opposite directions. That is, any second magnet on the seat ring 63 has a first magnet 51 matched therewith on the tamping weight 5, and the second magnet and the adjacent first magnet 51 matched with the first magnet 51 have a repelling relationship with each other. When the radial slider 64 moves the second magnet, the second magnet can move from a position above the matched first magnet 51 to a position above the adjacent first magnet 51, so as to push the tamping weight 5 to fall faster.

[0057] A release mechanism 8, fixed by a pin, is provided on the vertical pipe 7. The release mechanism 8 can be fixed to any position on the vertical pipe 7, thereby changing the height at which the compaction weight 5 is released, and thus changing the impact force on the semi-rigid base mixture. The release mechanism 8 includes a conical block 81, the lower end of which is conical. When the magnetic suction mechanism 6 rises to the release mechanism 8, the conical block 81 engages with the inclined surface of the radial slider 64 and pushes the radial slider 64 to slide in the radial direction, so as to control the falling of the compaction weight 5.

[0058] A fixed disk 82 is connected to the outer side of the upper end of the conical block 81. A guide rod 85 is slidably connected to the edge of the fixed disk 82. A thrust ring 84 is fixedly connected to the lower end of the guide rod 85. A compression spring 83 is sleeved on the guide rod 85, and its two ends abut against the thrust ring 84 and the fixed disk 82. During the upward movement of the compacted weight 5, the edge of the compacted weight 5 abuts against the thrust ring 84, and then the compression spring 83 is compressed. After the compacted weight 5 is released, the elastic force of the compression spring 83 accelerates the descent of the compacted weight 5, which helps to reduce the height of the vertical pipe 7 and improve the stability of the device.

[0059] The lead screw 22 is connected to the rotor of the lifting motor 2 via a coupling 21. When the lifting motor 2 is powered on, it can control the lead screw 22 to rotate forward or backward, thereby driving the seat ring 63 to rise or fall. When the seat ring 63 moves down, it can magnetically connect the compaction weight 5 that has fallen into the forming mold. When the seat ring 63 moves down, it can drive the compaction weight 5 to rise until it is released by the release mechanism 8, causing the compaction weight 5 to fall into the forming mold. This process can be repeated to achieve multiple compaction molding.

[0060] Example 4

[0061] like Figures 8-10 As shown, this embodiment designs a specimen molding device for testing the compressive strength of semi-rigid base layers, which is used to make specimens using a vibration molding method, including a molding mold 4 and a vibration platform 1.

[0062] The molding die 4 adopts the structure in Example 1; it can also adopt the structure in Example 2 and remove the static pressure component 9; it can also adopt the structure in Example 3 and remove the vertical tube 7, magnetic attraction mechanism 6, compaction weight 5, lead screw 22 and other components.

[0063] The vibration platform 1 includes components such as an upper platform 13, a lower platform 11, and an elastic pad 12.

[0064] The upper platform 13 is connected with the lower platform 11 through a plurality of elastic pads 12, the upper and lower ends of the elastic pads 12 are fixedly connected with the upper platform 13 and the lower platform 11 respectively, the elastic pads 12 can adopt cylindrical rubber columns; a vibrator 15 is installed on the lower surface of the upper platform 13; the forming mold 4 is fixed on the upper surface of the upper platform 13 through bolts; after the static pressure assembly 9 is disassembled, the vibrator 15 is powered on, and vibration can be transmitted to the forming mold through the upper platform 13, so that the semi-rigid base layer mixture in the forming mold 4 is vibrated, thereby forming a vibrated test piece.

[0065] The vibrator 15 has a plurality of and is distributed in a ring shape; the rotor of each vibrator 15 faces the center of the upper platform 13. Thus, the vibration direction of the vibrator 15 can be adjusted, the horizontal vibration or vertical vibration of different vibrators 15 is offset by changing the initial position of the pendulum on different vibrators 15, thereby strengthening the vibration in a specific direction, and the controllability of the vibration direction can be improved through the cooperation of a plurality of vibrators 15.

[0066] As shown in Figure 11 When the test piece is made by using the structure in Embodiment 3 without disassembling after the forming mold 4 is installed on the upper platform 13 to make the vibrated test piece, the damping of the elastic pad 12 will affect the forming effect of the test piece. Therefore, a plurality of jacks 14 can be threadedly connected to the upper platform 13, and the lower end of the jack 14 can pass through the lower platform 11 when the elastic pad 12 is in contact with the lower platform 11, thereby realizing the direct force transmission from the upper platform 13 to the lower platform 11 and locking the vibration platform 1, so that the forming mold 4 can realize the test piece manufacturing in Embodiment 3 without disassembling from the vibration platform 1.

[0067] The above embodiments are only examples for clearly illustrating the embodiments, and are not limited to the embodiments; all the embodiments do not need to be exhausted, and obvious changes or variations derived therefrom are still within the protection scope of the technology.

Claims

1. A test piece molding device for a semi-rigid base strength compressive strength test, characterized by: The forming die (4) and the static pressure assembly (9) are included. The forming die (4) includes two die halves (41); the two die halves (41) are folded to form a barrel-shaped structure with a barrel bottom and an open top, and a tubular mandrel (42) is arranged at the center of the barrel-shaped structure; the lower end of the mandrel (42) is fixedly connected with a sealing disc (43), and the sealing disc (43) is embedded in the barrel bottom of the barrel-shaped structure; The static pressure assembly (9) includes a static pressure plate (91), a static pressure cone (92) and a static pressure pin (93); the static pressure plate (91) is installed on the inner top of the forming die (4) and is penetrated by the mandrel (42), the lower end of the static pressure cone (92) abuts against the static pressure plate (91), the upper end is rotationally connected with the cap end of the static pressure pin (93), and the threaded end of the static pressure pin (93) is threadedly connected with the mandrel (42); the static pressure pin (93) applies a continuous static pressure on the semi-rigid base mixture in the forming die (4) through the static pressure cone (92) and the static pressure plate (91) to form a static pressure formed test piece.

2. The test piece molding apparatus for semi-rigid base course strength compression strength test according to Claim 1, wherein: Further including a vertical pipe (7) and a tamping weight (5); after the static pressure assembly (9) is disassembled, the lower end of the vertical pipe (7) is coaxially and threadedly connected to the upper end of the mandrel (42); the tamping weight (5) is in the shape of a round cake and is sleeved outside the vertical pipe (7); the tamping weight (5) reciprocally falls from a high place to impact the semi-rigid base mixture in the forming die (4) for multiple times to form a tamping formed test piece.

3. The test piece molding apparatus for semi-rigid base course strength compression strength test according to claim 2, characterized by: A magnetic attraction mechanism (6) is arranged on the vertical pipe (7); the magnetic attraction mechanism (6) includes a threaded sleeve (61), a connecting arm (62) and a seat ring (63); the seat ring (63) is sleeved outside the vertical pipe (7), the threaded sleeve (61) is arranged inside the vertical pipe (7) and is threadedly connected with a lead screw (22); one end of the connecting arm (62) is connected with the threaded sleeve (61), the other end extends out of a vertical slot on the vertical pipe (7) and is connected with the seat ring (63); a second magnet is arranged at the bottom of the seat ring (63), a first magnet (51) is arranged at the top of the tamping weight (5), when the first magnet (51) and the second magnet are magnetically attracted, the rotation of the lead screw (22) can drive the tamping weight (5) to rise through the magnetic attraction mechanism (6); when the first magnet (51) and the second magnet are disengaged, the tamping weight (5) falls and impacts the semi-rigid base mixture.

4. The test piece molding apparatus for semi-rigid base course strength compression strength test according to claim 3, characterized by: The magnetic attraction mechanism (6) further includes a plurality of radial sliding blocks (64); the radial sliding blocks (64) are slidingly connected to the bottom of the seat ring (63) and are annularly distributed; the second magnets are installed on the radial sliding blocks (64); when the radial sliding blocks (64) slide radially, the first magnet (51) and the second magnet are opposite or misaligned to realize magnetic attraction or disengagement.

5. The specimen forming device for semi-rigid base course strength compression strength test according to claim 4, characterized by: The radial sliding blocks (64) are in the shape of a long strip and are provided with a plurality of second magnets along the length direction; the magnetic poles of adjacent second magnets are opposite to each other. The second magnets correspond one-to-one to the first magnets (51) arranged at the top of the tamping weight (5); the magnetic poles of adjacent second magnets are opposite to each other.

6. The specimen molding device for semi-rigid base course strength compression strength test according to claim 4, characterized by: A release mechanism (8) is arranged on the vertical pipe (7) and fixed by a pin, the release mechanism (8) comprises a tapered block (81), the lower end of the tapered block (81) is tapered, when the magnetic attraction mechanism (6) rises to the release mechanism (8), the tapered block (81) cooperates with the inclined surface of the radial slider (64) and pushes the radial slider (64) to slide in the radial direction.

7. The test piece molding apparatus for semi-rigid base course strength compression strength test according to claim 6, characterized by: The upper end of the tapered block (81) is connected with a fixed disc (82), the edge of the fixed disc (82) is slidably connected with a guide rod (85), the lower end of the guide rod (85) is fixedly connected with a thrust ring (84), a compression spring (83) is sleeved on the guide rod (85) and abuts against the thrust ring (84) and the fixed disc (82) at both ends.

8. The specimen forming device for semi-rigid base course strength compression strength test according to claim 3, characterized by: The lead screw (22) is connected with the rotor of the lifting motor (2) through the coupling (21).

9. A test piece molding apparatus for semi-rigid base course strength compression strength test according to one of claims 1 to 8, characterized in that: The test piece forming device further comprises a vibrating platform (1); the vibrating platform (1) comprises an upper platform (13), a lower platform (11) and elastic pads (12); the upper platform (13) and the lower platform (11) are connected through a plurality of elastic pads (12); a vibrator (15) is installed on the lower surface of the upper platform (13); the forming mold (4) is fixed on the upper surface of the upper platform (13) through bolts; after the static pressure assembly (9) is disassembled, the vibrator (15) is powered on, so that the semi-rigid base layer mixture in the forming mold (4) is vibrated, thereby forming a vibrated test piece.

10. The test piece molding apparatus for semi-rigid base course strength compression strength test according to claim 9, characterized by: The upper platform (13) is threadedly connected with a jacking nail (14), when the lower end of the jacking nail (14) abuts against the lower platform (11), the locking of the vibrating platform (1) is realized; the vibrator (15) has a plurality of and is distributed in a ring shape; the rotors of the vibrators (15) are all directed to the center of the upper platform (13).

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