A compaction mold for soil test

Abstract

The utility model discloses a kind of compaction mould for geotechnical test, belong to compaction mould technical field, including cylinder, the cylinder is made of first splicing piece, second splicing piece and third splicing piece, the bottom plate is connected in the cylinder bottom, longitudinal fastener and transverse fastener are provided on the cylinder, the transverse fastener is installed on the outer circumferential surface of the cylinder, the longitudinal fastener includes several tenons, several tenons are arranged in the bottom of cylinder, rotating mortise is provided on the bottom plate and is engaged with the tenon, the through side of rotating mortise is inserted with clamping pin block, solve the problem that the existing mould is deformed and difficult to demould in high density compaction test due to lack of longitudinal constraint.

Description

Technical Field

[0001] This utility model belongs to the field of compaction mold technology, specifically relating to a compaction mold for geotechnical testing. Background Technology

[0002] The compaction test is a conventional laboratory test method that studies the compaction characteristics of soil samples by repeatedly tamping them. This method involves controlling different compaction efforts (compaction effort = hammer weight × drop height × number of blows) to compact soil samples with different moisture contents, and measuring the corresponding dry density. This allows for the plotting of a dry density-moisture content curve, obtaining the maximum dry density and optimum moisture content. These parameters provide important data for the design and construction of roadbed filling projects.

[0003] However, in actual experiments, the soil sample density gradually increases with the number of tamping blows. When a high level of compaction is reached, some of the energy generated by the hammer blows is transferred to the mold body, which can easily cause permanent deformation of the mold. Furthermore, excessively high compaction can make it difficult to remove the sample completely, affecting subsequent testing or observation. Therefore, to solve these problems, this paper designs a novel compaction mold structure, aiming to ensure experimental accuracy while preventing mold damage and facilitating complete sample removal.

[0004] Chinese patent CN209665717U discloses an easy-to-demold cylindrical mold, including a base and a cylindrical mold box. The base is provided with an annular guide groove. Two half-mold boxes can be spliced ​​together and installed through support blocks and pins to achieve a simple demolding operation. Multiple concentric annular guide grooves and support blocks support the preparation of specimens of various specifications, realizing a simple demolding operation for cylindrical specimens, improving sample preparation efficiency, and adapting to the preparation of specimens of various specifications, reducing material consumption. However, this cylindrical mold only uses two half-mold boxes, connected by a T-shaped protrusion and a slot, mainly to prevent lateral separation, but lacks longitudinal constraint and relies on external support blocks for fixation. The mold is prone to deformation and demolding difficulties in high-density compaction tests. Utility Model Content

[0005] In view of the problems existing in the prior art, the purpose of this utility model is to provide a compaction mold for geotechnical testing, so as to solve the problem that the existing molds are prone to deformation and demolding difficulties due to lack of longitudinal restraint in high-density compaction tests.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] This utility model provides a compaction mold for geotechnical testing, including a cylindrical body. The cylindrical body is composed of a first splicing piece, a second splicing piece, and a third splicing piece spliced ​​together. A base plate is connected to the bottom of the cylindrical body. Longitudinal fasteners and transverse fasteners are provided on the cylindrical body. The transverse fasteners are installed on the outer circumferential surface of the cylindrical body. The longitudinal fasteners include a plurality of tenons, which are located at the bottom of the cylindrical body. The base plate is provided with a rotating mortise that engages with the tenons. A locking pin is inserted into the through side of the rotating mortise.

[0008] Preferably, the longitudinal fastener includes a plurality of pin locks, and a plurality of pin holes for engaging the pin locks are provided at the splice joint of the first splice piece, the second splice piece and the third splice piece; the structure of the pin lock is the same as the structure of the pin holes.

[0009] Preferably, the upper and lower end faces of the latch lock are provided with a first groove, and the upper and lower end faces of the latch hole are provided with a protrusion, the protrusion and the first groove engaging with each other.

[0010] More preferably, the protrusion and the first groove are V-shaped.

[0011] Preferably, the tenon is provided in three parts.

[0012] Preferably, the locking block has a hexahedral structure, and a spherical object is mounted on the top of the hexahedron.

[0013] Preferably, the bottom plate has a second groove at its center for holding the cylinder.

[0014] Preferably, the transverse fastener includes a plurality of ring clamps, which are longitudinally arranged on the outer circumferential surface of the cylinder.

[0015] Preferably, the ring includes a first ring plate and a second ring plate, which are connected by two fasteners.

[0016] Preferably, a through hole is provided at the joint between the first and second ring clamps, and the through hole is used to insert a fastener. The through hole design allows the fastener to be adjusted in tightness as needed to accommodate the compaction strength of different soil samples.

[0017] Preferably, the fastener includes a bolt and a nut, which are rotatably connected.

[0018] Preferably, the nut is a wing nut.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] This invention provides a compaction mold for geotechnical testing. The tenon on the cylinder is aligned with a rotating mortise on the base plate via a through-hole side and then rotated. A locking pin is then inserted into the through-hole side to fix the position, enabling rapid connection and locking between the cylinder and the base plate. During compaction testing, this mold limits the movement of the cylinder. The tenon, rotating mortise, and locking pin work together to create longitudinal constraint on the cylinder, suppressing radial expansion. Lateral fasteners installed on the outer circumference of the cylinder prevent lateral misalignment of the first, second, and third splicing pieces, improving the cylinder's stability. The rigid connection formed by the tenon and rotating mortise effectively resists compaction impact and prevents upward displacement or bottom deformation of the cylinder. Unlocking is achieved by first pulling out the locking pin and then rotating the base plate in the opposite direction to the initial rotation, allowing for rapid separation of the rotating mortise and tenon, avoiding the cumbersome operation of traditional bolt disassembly and reducing the risk of sample damage. The three-piece spliced ​​cylinder facilitates assembly, maintenance, and transportation, reducing manufacturing costs.

[0021] Furthermore, by longitudinally setting several pin locks at the splicing points of the first, second, and third splicing pieces, the three splicing pieces are more tightly spliced ​​through mutual engagement with the pin holes, restricting the movement between the first, second, and third splicing pieces, effectively enhancing the longitudinal constraint force of the compaction mold. The locking of the pin locks at the splicing points prevents the three splicing pieces from misaligning and separating under high impact, ensuring the integrity of the cylinder. At the same time, the pin locks can be quickly inserted and removed, simplifying the disassembly and assembly process.

[0022] Furthermore, the three tenons provide multi-point fixation to disperse the impact stress and avoid deformation of the base plate or breakage of the tenons due to single-point overload; the tenons are unlocked by rotating in stages to reduce the risk of the sample suddenly falling off.

[0023] Furthermore, the first groove on the upper and lower end faces of the bolt lock engages with the protrusions on the upper and lower end faces of the bolt hole, increasing the contact area with the splicing piece. Friction prevents accidental unlocking caused by compaction vibration. The first groove structure facilitates finger application of force and improves the operating feel. The protrusions on both sides of the upper and lower ends can limit the splicing piece during compaction.

[0024] Furthermore, the design of the second groove ensures that the base plate and the cylinder fit precisely, preventing the cylinder from shifting or tilting during compaction; the second groove guides the cylinder to separate vertically, reducing frictional damage to the sidewalls of the sample.

[0025] Furthermore, the ring is longitudinally positioned on the outer circumference of the cylinder to provide outer ring reinforcement and resist the expansion and deformation of the cylinder caused by compaction pressure.

[0026] Furthermore, the two fixing components apply pressure evenly to the ring clamps, preventing local deformation of the cylinder and improving the consistency of test data. The multi-point fixing allows for segmented disassembly, shortening the overall operation time.

[0027] Furthermore, the bolts and nuts work together to control the pressure of the ring clamp on the cylinder by rotating the bolts, thus precisely suppressing deformation; loosening the nuts releases the fasteners, thereby releasing the constraint on the ring clamp and accelerating the disassembly process.

[0028] Furthermore, the wing nut can be manually tightened or loosened without tools, significantly improving testing efficiency and making it especially suitable for high-frequency testing scenarios. Attached Figure Description

[0029] Figure 1 This is a structural diagram of the compaction device for geotechnical testing according to this utility model;

[0030] Figure 2 This is a schematic diagram of the cylinder assembly state of this utility model;

[0031] Figure 3 This is a schematic diagram of the cylindrical body of this utility model in the state before splicing;

[0032] Figure 4 This is a schematic diagram of the ring hoop of this utility model;

[0033] Figure 5 This is a schematic diagram of the base plate of this utility model;

[0034] Figure 6 This is a structural diagram of the locking pin block of this utility model;

[0035] Figure 7 This is a structural diagram of the bolt lock of this utility model;

[0036] Among them, 1-cylinder; 2-ring; 3-base plate; 4-bolt; 5-locking pin; 6-pin lock; 7-first splicing piece; 8-second splicing piece; 9-third splicing piece; 10-tenon; 11-first ring hoop piece; 12-second ring hoop piece; 13-nut; 14-rotating mortise; 15-second groove; 16-pin hole. Detailed Implementation

[0037] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0038] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0039] The present invention will now be described in further detail with reference to the accompanying drawings:

[0040] Example 1

[0041] like Figure 1 As shown, this utility model provides a compaction mold for geotechnical testing, including a cylinder 1. The cylinder 1 is composed of a first splicing piece 7, a second splicing piece 8, and a third splicing piece 9 spliced ​​together. A base plate 3 is connected to the bottom of the cylinder 1. Longitudinal fasteners and transverse fasteners are provided on the cylinder 1. The transverse fasteners are installed on the outer circumferential surface of the cylinder 1. The longitudinal fasteners include a plurality of tenons 10, which are provided at the bottom of the cylinder 1. The base plate 3 is provided with a rotating mortise 14 that engages with the tenons 10. A locking pin 5 is inserted into the through side of the rotating mortise 14.

[0042] Furthermore, the longitudinal fastener includes a plurality of pin locks 6, and a plurality of pin holes 16 for engaging the pin locks are provided at the splicing points of the first splicing piece 7, the second splicing piece 8 and the third splicing piece 9; the structure of the pin lock 6 is the same as the structure of the pin hole 16.

[0043] Preferably, the upper and lower end faces of the latch lock 6 are provided with a first groove, and the upper and lower end faces of the latch hole 16 are provided with a protrusion, the protrusion and the first groove engaging with each other.

[0044] More preferably, the protrusion and the first groove are V-shaped.

[0045] Preferably, the tenon 10 is provided with three tenons.

[0046] Preferably, the locking block 5 has a hexahedral structure, and a spherical object is mounted on the top of the hexahedron.

[0047] Preferably, a second groove 15 for holding the cylinder 1 is provided at the center of the bottom plate 3.

[0048] Preferably, the transverse fastener includes a plurality of ring clamps 2, which are longitudinally arranged on the outer circumferential surface of the cylinder 1.

[0049] Preferably, the ring 2 includes a first ring 11 and a second ring 12, and the first ring 11 and the second ring 12 are connected by two fasteners.

[0050] More preferably, a through hole is provided at the connection between the first ring clamp 11 and the second ring clamp 12, and the through hole is used to insert a fixing member.

[0051] Preferably, the fastener includes a bolt 4 and a nut 13, which are rotatably connected.

[0052] Preferably, the nut 13 is a wing nut.

[0053] Further preferred, such as Figure 6 and Figure 7 As shown, several pin holes 16 are provided at the joints between the first splicing piece 7, the second splicing piece 8, and the third splicing piece 9, and the pin lock 6 is installed in the pin holes 16. During the compaction process, the cylinder 1 will be subjected to a force that causes it to expand outward. Because the cylinder 1 is spliced ​​from the first splicing piece 7, the second splicing piece 8, and the third splicing piece 9, the assembled cylinder 1 will have a force that causes it to expand outward. Figure 3 The trend of change means that the protrusions on both sides of the upper and lower ends of the latch lock 6 will limit the outward expansion of the first splicing piece 7, the second splicing piece 8, and the third splicing piece 9.

[0054] Figure 2 and Figure 3 The diagram shows the assembled and unassembled states of cylinder 1. When assembling cylinder 1, the first splicing piece 7, the second splicing piece 8, and the third splicing piece 9 are placed coaxially, with the pin holes 16 at the splicing points aligned neatly, forming a complete cylinder 1. The pin locks 6 are then inserted into the pin holes 16 to restrict movement between the first splicing piece 7, the second splicing piece 8, and the third splicing piece 9. During the compaction test, the pin-lock structure composed of the locking block 5 and the pin lock 6 bears the longitudinal force, providing a limiting function for the first splicing piece 7, the second splicing piece 8, and the third splicing piece 9.

[0055] More preferably, the bolt lock 6 is inserted into the bolt hole 16 using a neodymium magnet, which facilitates the installation and removal of the bolt lock 6.

[0056] like Figure 4As shown, a ring hoop 2 is circumferentially arranged on the outer surface of the cylinder 1. The ring hoop 2 includes a first ring hoop piece 11 and a second ring hoop piece 12, which are connected by a fastener. After the cylinder 1 is spliced ​​and fixed, the ring hoop 2 is circumferentially fitted onto the outer surface of the cylinder 1 to prevent excessive energy from impacting the soil inside the cylinder, which could cause deformation of the cylinder 1. A total of three ring hoops 2 are installed on the cylinder 1, with each ring hoop 2 positioned on the surface of the locking structure. The ring hoop 2 serves two purposes: firstly, it tightens the cylinder 1 to prevent the spliced ​​pieces from loosening during soil compaction; secondly, it limits the locking pin 5 to prevent the soil from squeezing out the locking pin 5 during impact. The connection between the first ring hoop piece 11 and the second ring hoop piece 12 is made of bolts 4, and the nut 13 is a wing nut, which ensures the ring hoop pieces are locked while facilitating disassembly.

[0057] Figure 5 The base plate 3 is shown, including a rotating mortise 14 and a second groove 15. After the cylinder 1 is assembled and fixed, it is placed in the second groove 15 from the through side of the rotating mortise 14, and the cylinder 1 is rotated so that the tenon 10 enters the inside of the rotating mortise 14. Then, the locking block 5 is inserted into the through side of the rotating mortise 14 to limit the position of the cylinder 1 during the compaction test.

[0058] The implementation method of the soil testing compaction mold of this utility model includes the following steps:

[0059] 1) Before the test begins, the first splicing piece 7, the second splicing piece 8, and the third splicing piece 9 are assembled into the cylinder 1. When the cylinder 1 is assembled from the unassembled state to the assembled state, the neodymium magnet is used to insert the locking pin 6 into the locking pin hole. At this time, the assembly and fixation of the cylinder 1 are completed.

[0060] 2) After the cylinder body 1 is assembled, install the ring clamps 2 from bottom to top to the designated positions according to the position of the pin locks 6 at the same height. When installing the ring clamps 2, first move the first ring clamp plate 11 and the second ring clamp plate 12 to the designated positions of the cylinder body 1, and ensure that the pin locks 6 are completely covered by the first ring clamp plate 11 and the second ring clamp plate 12. Then, use bolts 4 and wing nuts 13 to fix the first ring clamp plate 11 and the second ring clamp plate 12.

[0061] 3) After the upper structure of the mold is fixed, install the base plate 3. Align the tenon 10 on the cylinder 1 with the through side of the rotating mortise 14, press the cylinder 1 down into the second groove 15, and then rotate the cylinder 1 so that the tenon 10 enters the inner side of the rotating mortise 14. Then insert the locking block 5 into the through side of the rotating mortise 14 to connect the base plate 3 and the upper structure into a whole, preventing the cylinder 1 from shaking during the compaction test;

[0062] 4) After the compaction test is completed, repeat the steps in reverse order to remove the complete compacted soil sample.

[0063] The above content is only for illustrating the technical concept of this utility model and should not be construed as limiting the scope of protection of this utility model. Any modifications made to the technical solution based on the technical concept proposed in this utility model shall fall within the scope of protection of the claims of this utility model.

Claims

1. A compaction mold for geotechnical testing, characterized in that, The device includes a cylindrical body (1), which is composed of a first splicing piece (7), a second splicing piece (8) and a third splicing piece (9) spliced ​​together. A bottom plate (3) is connected to the bottom of the cylindrical body (1). Longitudinal fasteners and transverse fasteners are provided on the cylindrical body (1). The transverse fasteners are installed on the outer circumferential surface of the cylindrical body (1). The longitudinal fasteners include a number of tenons (10). The number of tenons (10) are provided at the bottom of the cylindrical body (1). A rotating mortise (14) is provided on the bottom plate (3) to engage with the tenons (10). A locking pin (5) is inserted into the through side of the rotating mortise (14).

2. The compaction mold for geotechnical testing according to claim 1, characterized in that, The longitudinal fastener includes several pin locks (6), and several pin holes (16) for inserting the pin locks are provided at the splicing points of the first splicing piece (7), the second splicing piece (8) and the third splicing piece (9); the structure of the pin lock (6) is the same as the structure of the pin hole (16).

3. The compaction mold for geotechnical testing according to claim 2, characterized in that, The upper and lower end faces of the latch lock (6) are provided with a first groove, and the upper and lower end faces of the latch hole (16) are provided with a protrusion, and the protrusion and the first groove engage with each other.

4. The compaction mold for geotechnical testing according to claim 1, characterized in that, The tenon (10) is provided in three parts.

5. A compaction mold for geotechnical testing according to claim 1, characterized in that, The locking block (5) has a hexahedral structure, and a spherical body is installed on the top of the hexahedron.

6. The compaction mold for geotechnical testing according to claim 1, characterized in that, A second groove (15) for holding the cylinder (1) is provided at the center of the bottom plate (3).

7. The compaction mold for geotechnical testing according to claim 1, characterized in that, The transverse fasteners include several rings (2), which are longitudinally arranged on the outer circumferential surface of the cylinder (1).

8. A compaction mold for geotechnical testing according to claim 7, characterized in that, The ring clamp (2) includes a first ring clamp piece (11) and a second ring clamp piece (12), which are connected by two fasteners.

9. A compaction mold for geotechnical testing according to claim 8, characterized in that, The fastener includes a bolt (4) and a nut (13), which are rotatably connected.

10. A compaction mold for geotechnical testing according to claim 9, characterized in that, The nut (13) is a wing nut.

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