Device for recovering standard sand for sand filling method test
By designing the storage chamber, baffle, primary screen and secondary screen devices in the skeleton, the problem of low recovery efficiency of standard sand is solved, efficient screening and recycling is achieved, and the testing cost is reduced.
Patent Information
- Application Number
- CN202422617379.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-29
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-10-29
AI Technical Summary
The existing standard sand recycling device has a simple structure, which leads to multiple screenings during standard sand recycling, which increases the workload of workers and is inefficient.
A device including a skeleton, storage chamber, baffle, primary screen and secondary screen were designed. Standard sand was screened through primary screen and secondary screen to filter out larger and smaller particles respectively to simplify the recycling process.
It improves the recycling quality and efficiency of standard sand, reduces waste during the test process, and saves test costs.
Smart Images
Figure CN223145299U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of soil compaction degree detection, in particular to a device for standard sand used in the sand replacement method test for recovery. Background Technique
[0002] The sand replacement method is an important means for detecting the soil compaction degree, used for the quality detection of various undisturbed soils and backfill soils, and is an important index for judging the backfill compaction quality. Standard sand is one of the most important materials in this test. The particle size of the standard sand generally adopts 0.25mm - 0.5mm. During the test, the standard sand needs to be filled into the test pit according to the requirements for detection. After the test, the standard sand needs to be taken out for recycling, so as to achieve the purpose of saving the test cost.
[0003] Taking the "Code for Highway Geotechnical Tests" (JTG 3430 - 2020) as an example, when the maximum particle size of the subgrade soil does not exceed 60mm, the sand replacement method can be used to measure the density of the soil on site. The particle size of the standard sand in this specification is 0.25mm - 0.5mm, clean, dry and uniform sand, and the amount required for each test is about 20kg - 40kg. The standard sand should be dried first and left for enough time to reach thermal equilibrium with the air.
[0004] During on-site tests, if the test ground is flat, the test pit can be directly excavated at the test ground. After the test pit is completed, the sand storage bucket containing the standard sand is placed above the test pit, the switch is opened, and the standard sand freely falls until the test pit and the cone are filled, and then the switch is closed to complete the process of filling with sand; if the test ground is uneven, the base plate needs to be placed first, the sand storage bucket is placed on the base plate, the mass of the standard sand in the base plate and the cone is measured, then the measuring sand is taken away, and then the test pit is excavated to complete the process of filling with sand. After the test is completed, the measuring sand in the test pit is recovered for use in the next test.
[0005] The common method for recovering the measuring sand currently is to directly recover the standard sand in the test pit that has not contacted the surrounding soil with a spoon for standby, and the rest that may be contaminated by the soil is recovered for standby after being sieved through standard sand with particle sizes of 0.25mm and 0.50mm. During the recovery, the standard sand needs to be sieved twice, the operation process is cumbersome, increasing the workload of the construction workers and reducing the efficiency of the workers in recovering the standard sand. Content of the Utility Model
[0006] In view of the above situation, to overcome the defects of the prior art, the utility model provides a device for standard sand used in the sand replacement method test for recovery, which effectively solves the problems that the existing standard sand recovery device has a simple structure, requires multiple sieving during the recovery of standard sand, thus increasing the workload of workers and slow efficiency of standard sand recovery.
[0007] To achieve the above object, the present utility model provides the following technical solutions: The present utility model includes a skeleton, a material storage cavity is provided inside the skeleton, a baffle is provided above the material storage cavity, the baffle is fixedly connected to the skeleton, a primary screen is fixedly connected between the skeleton and the baffle, a secondary screen is provided below the material storage cavity, the secondary screen is fixedly connected to the bottom end of the skeleton, and a discharge port is provided on the skeleton between the primary screen and the secondary screen.
[0008] Preferably, the discharge port is located below the baffle, the baffle is provided with screening holes, and the aperture of the screening holes is smaller than the aperture of the secondary screen.
[0009] Preferably, a threaded pipe is fixedly connected at the discharge port, and a sealing plug is threadedly connected to the threaded pipe.
[0010] Preferably, the skeleton is a hollow columnar structure, handles are fixedly connected to both sides of the skeleton, and the upper end of the skeleton is higher than the upper end of the bottom plate.
[0011] Preferably, clamping rings are fixedly connected to the edges of both the primary screen and the secondary screen, and the clamping rings are fixedly connected to the skeleton by bolts.
[0012] Compared with the prior art, the prominent advantages of the present utility model are:
[0013] The present utility model screens out oversized and undersized particles in the standard sand through the primary screen and the secondary screen, ensures the recycling quality of the standard sand, reduces the waste of the standard sand during the test process, thereby improving the test efficiency and saving the test cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the overall structure of the present utility model.
[0015] Figure 2 It is a schematic axonometric sectional view of the skeleton of the present utility model.
[0016] Figure 3 It is a schematic front sectional view of the skeleton of the present utility model.
[0017] Reference numerals in the figures: 1, skeleton; 2, material storage cavity; 3, baffle; 4, primary screen; 5, secondary screen; 6, discharge port; 7, screening holes; 8, threaded pipe; 9, sealing plug; 10, handle; 11, clamping ring; 12, bolt. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0018] Combined with the accompanying drawings in the embodiments of the present utility model, the technical solutions in the embodiments of the present utility model are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments; based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the protection scope of the present utility model.
[0019] Please refer to the attached Figures 1-3 , a device for standard sand in the recovery sand pouring method test in this embodiment: including a framework 1, a storage cavity 2 is arranged inside the framework 1, a baffle 3 is arranged above the storage cavity 2, the baffle 3 is fixedly connected with the framework 1, a primary sieve 4 is fixedly connected between the framework 1 and the baffle 3, a secondary sieve 5 is arranged below the storage cavity 2, the secondary sieve 5 is fixedly connected with the bottom end of the framework 1, and a discharge port 6 is arranged on the framework 1 between the primary sieve 4 and the secondary sieve 5.
[0020] This device is used to recover the standard sand used in the sand pouring method on-site experiment. The framework 1 serves as a support for the primary sieve, the secondary sieve 5 and the baffle 3. The mesh size of the primary sieve 4 is 0.5 mm, the mesh size of the secondary sieve 5 is 0.25 mm, and the sieve holes 7 on the baffle 3 have a pore diameter not greater than 0.25 mm. The baffle 3 is made of stainless steel material. When in use, the device is placed flat, and the standard sand in the test pit is directly placed on the 0.5-mm primary sieve 4. After screening, the larger particles mixed in the standard sand can be filtered out. The smaller particles pass through the primary sieve 4 and enter the storage cavity 2. The standard sand in the storage cavity 2 will continue to be screened on the secondary sieve 5 until no particles are screened out under the 0.25-mm sieve. The secondary sieve 5 filters out the smaller particles mixed in the standard sand. Then the device is placed upright with the discharge port 6 at the bottom, and the standard sand can be temporarily stored between the baffle 3 and the secondary sieve 5, so as to screen out the larger and smaller particles mixed in the standard sand in the sand pouring test pit and enclose the standard sand in the storage cavity 2. The storage cavity 2 is connected to the discharge port 6, and the discharge port 6 can be opened when needed to pour out the standard sand to complete the recovery of the standard sand.
[0021] The primary sieve 4 and the baffle 3 are at the same height. The framework 1 is a cylindrical structure without a bottom and a cover. The primary sieve 4 and the baffle 3 form a complete disc structure. The baffle 3 accounts for about 40%-50% of the area of this disc. The secondary sieve 5 is located in the disc structure by itself.
[0022] Further, in order to facilitate the replacement of the primary screen 4 and the secondary screen 5, ratchet clamps 11 are provided on the outer periphery of both the primary screen 4 and the secondary screen 5. The clamp 11 is made of stainless steel and fits against the inner wall of the frame 1. There are multiple fixing holes between the clamp 11 and the frame 1, and bolts 12 are installed in the fixing holes to complete the fixation of the clamp 11 through the bolts 12. After the primary screen 4 or the secondary screen 5 is damaged subsequently, it can be conveniently replaced.
[0023] When screening standard sand, in order to place more on the primary screen 4, the height of the primary screen 4 is lower than the upper edge of the frame 1, so as to avoid the leakage of standard sand during shaking. For the convenience of the user to operate, handles 10 are provided on both sides of the frame 1, and the handles 10 facilitate the user to apply force.
[0024] At the discharge port 6, the opening and closing of the discharge port 6 are controlled by a sealing plug 9. The sealing plug 9 is threadedly connected to the threaded pipe 8 of the discharge port 6, and the cooperation between the sealing plug 9 and the threaded pipe 8 is controlled by rotation. The threaded cooperation ensures the stability of the sealing of the discharge port 6 and avoids the non-artificial opening of the discharge port 6 due to the shaking of the frame 1.
[0025] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. An apparatus for recycling standard sand used in sand replacement method tests, characterized in that: It includes a framework (1), a material storage cavity (2) is arranged inside the framework (1), a baffle (3) is arranged on the upper side of the material storage cavity (2), the baffle (3) is fixedly connected with the framework (1), a primary screen (4) is fixedly connected between the framework (1) and the baffle (3), a secondary screen (5) is arranged on the lower side of the material storage cavity (2), the secondary screen (5) is fixedly connected with the bottom end of the framework (1), and a discharge port (6) is arranged on the framework (1) between the primary screen (4) and the secondary screen (5).
2. The device for recycling standard sand used in the sand pouring method test according to claim 1, characterized in that: The discharge port (6) is located below the baffle (3), the baffle (3) is provided with screen holes (7), and the aperture of the screen holes (7) is smaller than the aperture of the secondary screen (5).
3. The device for recycling standard sand used in the sand pouring method test according to claim 1, characterized in that: A threaded pipe (8) is fixedly connected at the discharge port (6), and a sealing plug (9) is threadedly connected to the threaded pipe (8).
4. The device for recycling standard sand used in the sand replacement method test according to claim 1, characterized in that: The framework (1) is of a hollow columnar structure, handles (10) are fixedly connected to both sides of the framework (1), and the upper end of the framework (1) is higher than the upper end of the bottom plate.
5. The device for recycling standard sand used in the sand pouring method test according to claim 1, characterized in that: Clamps (11) are fixedly connected to the edges of both the primary screen (4) and the secondary screen (5), and the clamps (11) are fixedly connected to the framework (1) through bolts (12).