Cement stabilized soil shear strength testing device

Abstract

The utility model discloses a device for testing shear strength of cement stabilized soil, which belongs to the technical field of soil detection and comprises a base, a shear box is arranged on the base and comprises a lower box and an upper box, the upper box is placed at the top end of the lower box and provided with four second through holes, and the second through holes are communicated with the lower box. According to the utility model, the tops of the four positioning rods on the positioning assembly slide into the four through holes II in the upper box, so that the upper box can be conveniently positioned and fixed, the placement time of a sample is greatly shortened, and the test efficiency of the direct shear apparatus is effectively improved; the lifting scraping disc is pushed to move upwards in the lower box through the lifting cleaning assembly, so that the fractured part of the sample in the lower box can be quickly taken out, residual sample scraps on the surface of the inner wall of the lower box can be conveniently scraped and cleaned, the operation time is greatly shortened, and the cleaning efficiency of the fractured part of the sample in the lower box is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of soil testing technology, specifically to a device for testing the shear strength of cement-stabilized soil. Background Technology

[0002] To systematically evaluate the long-term performance of Class A4 soil in cement-soil subbases, it is necessary to monitor and analyze the performance of Class A4 soil under different environmental conditions. This will allow for a deeper understanding of the changes in key performance indicators such as compressive strength, shear strength, durability, deformation characteristics, and permeability of Class A4 soil over long-term use, and to assess the impact of external environmental factors such as climate and traffic loads on the long-term performance of Class A4 soil. Therefore, to ensure the stability and reliability of Class A4 soil in practical engineering applications, it is necessary to use testing equipment (i.e., a direct shear tester) to detect and analyze the shear strength of Class A4 soil in road construction.

[0003] However, existing direct shear testers require multiple screws to position and fix the upper box before placing the ring cutter sample into the shearing chamber for testing. This operation is cumbersome, time-consuming, and labor-intensive, and can easily affect the testing efficiency of the direct shear tester. After the test is completed, the tester needs to manually scrape off the broken part of the sample from the lower box to facilitate the subsequent detection of moisture content near the shear surface. Manual scraping reduces efficiency and is cumbersome. Furthermore, the residual debris from the sample tends to adhere to the inner wall surface of the lower box, making cleaning difficult. Utility Model Content

[0004] The purpose of this invention is to provide a shear strength testing device for cement-stabilized soil. Through the structural design of the positioning component and the lifting and cleaning component, the upper box can be conveniently positioned and fixed, and the broken part of the sample in the lower box can be quickly removed. This solves the problems of the cumbersome positioning and fixing of the upper box and the need for manual scraping and removal of the broken part of the sample in the lower box.

[0005] This utility model is achieved through the following technical solution:

[0006] This utility model relates to a shear strength testing device for cement-stabilized soil, comprising a base, a shear box mounted on the base, the shear box comprising a lower box and an upper box, the upper box being placed on top of the lower box, the upper box having four through holes (two in total), a rectangular groove at the bottom of the lower box communicating with the interior of the lower box, two movable through grooves on the lower box communicating with the interior of the rectangular groove, four through holes (one in total) on the lower box communicating with the interior of the rectangular groove, a positioning component fitting within the rectangular groove, the positioning component comprising a rectangular frame, four vertically mounted positioning rods on the rectangular frame, springs fitting on the outer surface of the positioning rods, the positioning rods engaging with the first through hole, the top surface of the positioning rods engaging with the second through hole, two movable blocks on the rectangular frame, the movable blocks engaging with the second through hole. The movable channel is fitted with a sliding groove. The end of the movable channel away from the rectangular frame passes through the movable channel. An L-shaped rod is set at the end of the movable channel away from the rectangular frame. A horizontal plate is set at one end of the two L-shaped rods. A T-shaped block is set on the horizontal plate. A locking bolt is threaded on the T-shaped block. A lifting scraper is fitted to the bottom inner wall of the lower box. A lifting cleaning component is set at the bottom center of the lifting scraper. The lifting cleaning component includes a screw and a rotating rod. A circular groove is opened on the base. The screw rotates and fits in the circular groove. A drive plate is threaded on the outer surface of the screw. A connecting rod is set on the drive plate. There are three connecting rods. A lifting plate is set at the bottom end of the three connecting rods. A driven bevel gear is interference-fitted on the bottom end surface of the screw. A driving bevel gear is interference-fitted on one end of the rotating rod. The driven bevel gear meshes with the driving bevel gear. A through hole is opened on the lower box. The surface of the rotating rod away from the driving bevel gear rotates and fits in the through hole.

[0007] Furthermore, the bottom of the base is provided with two sliding bars.

[0008] Furthermore, two sliders are provided on the rectangular frame, and two grooves are provided in the rectangular slot, with the sliders cooperating with the grooves.

[0009] Furthermore, a limiting groove is provided on the lower box, and one end of the locking bolt is engaged with the limiting groove.

[0010] Furthermore, a pull ring is provided on the T-block, and a handle is provided on the end of the locking bolt away from the limiting groove.

[0011] Furthermore, the end of the rotating rod away from the driving bevel gear passes through the through hole, and a turntable is provided at the end of the rotating rod away from the driving bevel gear.

[0012] This utility model has the following beneficial effects:

[0013] 1. This utility model, through the structural design of the positioning component, allows the tops of the four positioning rods on the positioning component to slide into the four through holes on the upper box, which can conveniently position and fix the upper box. The operation is simple and the sample can be placed quickly, which greatly shortens the sample placement time, improves the sample placement speed, and effectively improves the testing efficiency of the direct shear tester.

[0014] 2. This utility model, through the structural design of the lifting and cleaning component, pushes the lifting scraper plate upward in the lower box, thereby quickly removing the broken sample from the lower box and conveniently scraping and cleaning the sample debris remaining on the inner wall surface of the lower box, greatly shortening the operation time and effectively improving the cleaning efficiency of the broken sample in the lower box. It is simple and practical to operate.

[0015] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the assembly structure of the shear box.

[0017] Figure 2 This is a schematic diagram of the clipboard structure.

[0018] Figure 3 This is a schematic diagram of the structure at the top of the clipboard.

[0019] Figure 4 This is a schematic diagram of the positioning component.

[0020] Figure 5 This is a structural diagram of the lifting and cleaning assembly.

[0021] Figure 6 This is a structural diagram of the lower box.

[0022] In the diagram: 1. Base; 2. Shearing box; 3. Lower box; 301. Rectangular groove; 302. Movable through groove; 303. Through hole one; 304. Slide groove; 305. Restriction groove; 4. Upper box; 401. Through hole two; 5. Positioning assembly; 501. Rectangular frame; 5011. Movable block; 5012. Slider; 502. Positioning rod; 503. Spring; 504. L-shaped rod; 505. Horizontal plate; 506. T-shaped block; 507. Locking bolt; 6. Lifting and cleaning assembly; 601. Screw; 602. Drive plate; 6021. Connecting rod; 603. Driven bevel gear; 604. Rotating rod; 6041. Turntable; 605. Driven bevel gear; 606. Lifting plate; 7. Lifting scraper. Detailed Implementation

[0023] The technical solutions of the present utility model 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 utility model, and not 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 effort are within the protection scope of the present utility model.

[0024] Please see Figure 1-6 This utility model provides a technical solution: a shear strength testing device for cement-stabilized soil, including a base 1. The bottom of the base 1 is provided with two sliding clips to facilitate the insertion of the shear box 2 into the direct shear tester. The shear box 2 is provided on the base 1. The shear box 2 includes a lower box 3 and an upper box 4. The upper box 4 is placed on top of the lower box 3. The upper box 4 has four through holes 401.

[0025] The bottom of the lower box 3 has a rectangular groove 301 that communicates with the interior of the lower box 3. The lower box 3 has two movable through grooves 302 that communicate with the interior of the rectangular groove 301. The lower box 3 also has four through holes 303 that communicate with the interior of the rectangular groove 301.

[0026] A positioning component 5 is fitted inside the rectangular groove 301. The positioning component 5 includes a rectangular frame 501, on which four positioning rods 502 are vertically mounted. A spring 503 is fitted on the outer surface of each positioning rod 502. The positioning rods 502 engage with through holes 303 and their top surfaces engage with through holes 401. Two sliders 5012 are mounted on the rectangular frame 501. Two sliding grooves 304 are formed inside the rectangular groove 301. The sliders 5012 engage with the sliding grooves 304 to ensure that the rectangular frame 501 can move stably within the rectangular groove 301.

[0027] Two movable blocks 5011 are provided on the rectangular frame 501. Each movable block 5011 mates with a movable through slot 302. One end of the movable through slot 302, away from the rectangular frame 501, passes through the slot. An L-shaped rod 504 is provided at the end of the movable through slot 302 away from the rectangular frame 501. A horizontal plate 505 is horizontally provided at one end of each L-shaped rod 504. A T-shaped block 506 is provided on the horizontal plate 505, and a threaded hole is provided on the T-shaped block. A locking bolt 507 is threaded onto the T-block 506. The T-block 506 has a threaded hole, and the locking bolt 507 fits into the threaded hole. The lower box 3 has a limiting groove 305, and one end of the locking bolt 507 fits into the limiting groove 305, which facilitates the fixing of the positioning component 5 as a whole. The T-block 506 is provided with a pull ring, which makes it easy to pull the T-block 506 upward. The end of the locking bolt 507 away from the limiting groove 305 is provided with a handle, which makes it easy to rotate the locking bolt 507.

[0028] Before conducting the shear strength test, the shear box 2 is first inserted into the two slots on the operating table of the direct shearing instrument via the two sliding clips at the bottom of the base 1. Then, the upper box 4 is placed at the bottom of the lower box 3, aligning the four through holes 401 on the upper box 4 with the four through holes 303 on the lower box 3. Next, the pull ring on the T-block 506 is pulled upward, causing the horizontal plate 505 to move upward and pulling the two L-shaped rods 504 upward. Through the cooperation of the movable block 5011 and the movable through slot 302, the two movable blocks 5011 slide within their respective movable through slots 302. The rectangular frame 501 is pulled upward within the rectangular groove 301. This upward movement causes the four positioning rods 502 on the frame to slide within their corresponding through holes 303. The limiting rings at the top of the springs 503 press against the inner wall of the rectangular groove 301, causing the four springs 503 to contract on the outer surface of their respective positioning rods 502. This contraction of the springs 503 causes the tops of the positioning rods 502 to slide upward within the through hole 303 and out of the through hole 303 into the through hole 401 on the upper box 4. When the four positioning rods... After the top of the positioning rod 502 slides into the four through holes 401 on the upper box 4, the locking bolt 507, which is threaded onto the T-block 506, is turned by the shank on the locking bolt 507. This causes one end of the locking bolt 507 to contact and press against the inner wall surface of the limiting groove 305 on the lower box 3, thus fixing the T-block 506. This keeps the rectangular frame 501 in place within the rectangular groove 301, achieving the positioning and fixing of the upper box 4. Then, the sample is placed into the space between the upper box 4 and the lower box 3, so that the upper half of the sample... The upper part is located in the upper box 4, and the lower part is located in the lower box 3. After the sample is placed, the handle on the locking bolt 507 is turned so that one end of the locking bolt 507 is separated from the limiting groove 305. Through the rebound force of the four springs 503, the four positioning rods 502 are moved down and separated from the four through holes 401 on the upper box 4. Then the top cap is put into the upper box 4 and connected to the vertical pressure system on the straight shear instrument. Then one side of the lower box 3 is connected to the horizontal pressure system. Then the straight shear instrument is operated to test the shear strength of the sample placed on the shear box 2.

[0029] The bottom inner wall of the lower box 3 is fitted with a lifting scraper 7. A lifting cleaning assembly 6 is located at the center of the bottom of the lifting scraper 7. The lifting cleaning assembly 6 includes a screw 601 and a rotating rod 604. A circular groove is provided on the base 1, and the screw 601 is rotatably fitted into the groove. A drive disc 602 is threaded onto the outer surface of the screw 601. Three connecting rods 6021 are provided on the drive disc 602. A lifting disc 606 is located at the bottom end of each of the three connecting rods 6021. The bottom surface is interference-fitted with a driven bevel gear 603, and one end of the rotating rod 604 is interference-fitted with a driving bevel gear 605. The driven bevel gear 603 meshes with the driving bevel gear 605. A through hole is provided on the lower box 3. The surface of the rotating rod 604 away from the driving bevel gear 605 is rotatably fitted in the through hole. The end of the rotating rod 604 away from the driving bevel gear 605 passes through the through hole. A turntable 6041 is provided at the end of the rotating rod 604 away from the driving bevel gear 605, which can facilitate the rotation of the rotating rod 604.

[0030] After completing the shear strength test, in order to facilitate the detection of moisture content near the shear surface of the sample and to clean up the remaining broken samples in the lower box 3, it is necessary to remove some samples from the lower box 3. First, rotate the turntable 6041 so that the rotating rod 604 rotates in the rectangular groove 301. The rotation of the rotating rod 604 causes the driving bevel gear 605 at one end of the rotating rod 604 to rotate. Through the meshing of the driven bevel gear 603 with the driving bevel gear 605, the driven bevel gear 603 rotates and drives the screw 601 to the center of the top surface of the base 1. The rotation of the screw 601 causes the drive disc 602 to move upward on the outer surface of the screw 601, which in turn causes the lifting disc 606 to move upward via the three connecting rods 6021. The upward movement of the lifting disc 606 pushes the lifting scraper 7 to move upward within the lower box 3. The friction between the outer surface of the lifting scraper 7 and the inner wall of the lower box 3 causes the broken sample in the lower box 3 to be pushed upward and pushed out, and the sample residue remaining on the inner wall surface of the lower box 3 is scraped off, thus achieving rapid removal of the broken sample from the lower box 3.

[0031] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A shear strength testing device for cement-stabilized soil, comprising a base (1), characterized in that: The base (1) is provided with a shearing box (2), which includes a lower box (3) and an upper box (4). The upper box (4) is placed on the top of the lower box (3). The upper box (4) has four through holes (401). The bottom of the lower box (3) is provided with a rectangular groove (301), which is connected to the interior of the lower box (3). The lower box (3) is provided with two movable through grooves (302), which are connected to the interior of the rectangular groove (301). The lower box (3) is provided with four through holes (303), which are connected to the interior of the rectangular groove (301). A positioning component (5) is fitted inside the rectangular groove (301). The positioning component (5) includes a rectangular frame (501). A positioning rod (502) is vertically arranged on the rectangular frame (501). There are four positioning rods (502). A spring (503) is fitted on the outer surface of the positioning rod (502). The positioning rod (502) is fitted with a through hole one (303). The top surface of the positioning rod (502) is fitted with a through hole two (401). The rectangular frame (501) is provided with two movable blocks (5011). The movable blocks (5011) cooperate with the movable through slot (302). The end of the movable through slot (302) away from the rectangular frame (501) passes through the movable through slot (302). An L-shaped rod (504) is provided at the end of the movable through slot (302) away from the rectangular frame (501). A horizontal plate (505) is provided at one end of the two L-shaped rods (504). A T-shaped block (506) is provided on the horizontal plate (505). A locking bolt (507) is threaded on the T-shaped block (506). The bottom inner wall of the lower box (3) is fitted with a lifting scraper (7), and a lifting cleaning assembly (6) is provided at the bottom center of the lifting scraper (7). The lifting cleaning assembly (6) includes a screw (601) and a rotating rod (604). A circular groove is provided on the base (1), and the screw (601) is rotatably fitted in the circular groove. A drive disc (602) is threaded on the outer surface of the screw (601), and a connecting rod (6021) is provided on the drive disc (602). 21) There are three of them. The bottom end of the three connecting rods (6021) is provided with a lifting plate (606). The bottom end surface of the screw (601) is interference-fitted with a driven bevel gear (603). One end of the rotating rod (604) is interference-fitted with a driving bevel gear (605). The driven bevel gear (603) meshes with the driving bevel gear (605). The lower box (3) is provided with a through hole. The end surface of the rotating rod (604) away from the driving bevel gear (605) is rotatably fitted in the through hole.

2. The shear strength testing device for cement-stabilized soil according to claim 1, characterized in that, The base (1) has two sliding bars at its bottom.

3. The shear strength testing device for cement-stabilized soil according to claim 1, characterized in that, The rectangular frame (501) is provided with two sliders (5012). The rectangular groove (301) is provided with two sliding grooves (304). The sliders (5012) cooperate with the sliding grooves (304).

4. The shear strength testing device for cement-stabilized soil according to claim 3, characterized in that, The lower box (3) is provided with a limiting groove (305), and one end of the locking bolt (507) is engaged with the limiting groove (305).

5. The shear strength testing device for cement-stabilized soil according to claim 4, characterized in that, The T-block (506) is provided with a pull ring, and the locking bolt (507) is provided with a handle at the end away from the limiting groove (305).

6. The shear strength testing device for cement-stabilized soil according to claim 1, characterized in that, The end of the rotating rod (604) away from the driving bevel gear (605) passes through a through hole, and a turntable (6041) is provided at the end of the rotating rod (604) away from the driving bevel gear (605).

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