A cement soil fragment core sample strength testing system and testing method

Abstract

The present invention provides a cement soil fragment core sample strength test system and test method, which are used to solve the problem that the conventional technology cannot produce core sample samples that meet the standard size requirements by hole sampling and cannot quickly and accurately test the strength of cement soil fragment core samples. It includes: a sample processing device, a strength estimation device for estimating the strength range of standard samples, and a strength testing device for testing the strength of standard samples. The sample processing device includes a base, a rotating pillar rotatably arranged above the base, a first column vertically and fixedly connected to the top of the base, a first support platform fixedly connected to the top of the first column, a loading part arranged at the top of the first support platform, a sample support platform vertically and fixedly connected to the top of the rotating pillar, a mixing casting part fixedly connected to the bottom of the first support platform, a plurality of sample tubes, and a rotating power assembly for driving the rotating pillar to rotate. The sample support platform has a plurality of grooves. The system can not only quickly produce standard samples that meet the standard size requirements, but also quickly and accurately test.

Description

Technical Field

[0001] The invention belongs to the technical field of geotechnical engineering, and in particular relates to a cement soil fragment core sample strength testing system and a testing method. Background Art

[0002] High-pressure jet grouting piles and cement-soil mixing piles are a commonly used foundation reinforcement technology, which is widely used in the reinforcement of soft foundations in housing construction, highways, bridges, tunnels and other projects. In terms of the inspection of pile quality, the Technical Specification for Building Foundation Treatment (JGJ79-2012) specifies the strength test method, that is, after 28 days of pile construction, a double-tube single-action sampler is used to drill core samples for cement soil compressive strength test. The Technical Specification for Building Foundation Testing (JGJ340-2015) specifies that the diameter of the sample for the compressive strength test should not be less than 70mm, and the height-to-diameter ratio of the specimen should be 1:1. After coring on site, it is cut into standard size samples (generally 70~150mm in diameter, 1:1 cylindrical sample with a height-to-diameter ratio) according to the requirements of the specification for unconfined compressive strength test. However, during the coring process, due to many reasons such as uneven cement-soil content in the pile body, improper installation or operation of the drilling equipment, and unreasonable setting of drilling parameters, the core samples taken appear as short columns, split samples, and fragments. It is impossible to produce core samples that meet the standard size requirements, resulting in the inability to accurately evaluate the effect of foundation reinforcement.

[0003] According to Section 2.13 of the Standard for Engineering Rock Mass Test Methods (GB / T 50266-2013), the point load strength test can be used to test the compressive strength of irregular rock blocks. However, the rock strength is generally greater than 10MPa. The point load test can generally measure relatively stable results. The strength of cement soil fragments is generally between 0.1 and 5MPa. When using the point load test, a slight pressure will destroy the core sample, and stable and reliable results cannot be measured. The rebound hammer is another instrument that can quickly test the strength of structures such as concrete, mortar, and brick walls. According to their uses, they can be divided into concrete rebound hammers (10MPa~60MPa), mortar rebound hammers (2MPa~15MPa), and brick rebound hammers (6MPa~30MPa). The strength test range is basically between 2MPa~60MPa. Since the strength of cement soil is between 0.1MPa~5MPa, the use of rebound hammers to test the strength of cement soil is easy to break the test block, resulting in poor test accuracy. In addition, the rebound tester is generally handheld, requiring manual pressing of the spring rod and keeping the instrument perpendicular to the surface of the test structure, which results in large human operating errors.

[0004] Prior to the present invention, an invention patent (CN 118150334 A) disclosed a method and system for testing the compressive strength of broken rock blocks. The method placed the rock block in a cylindrical test chamber and vibrated it, radially limited the test rock block through the test chamber, and cooperated with the axial pressure of the pressure plate to achieve axial compressive testing of the broken rock block. The porosity of the test rock block was measured by the water filling method, and the displacement data and pressure data of the test rock block obtained during the downward pressure on the sample rock block were used to correlate the compressive strength of the test rock block with the porosity and fracture pressure, thereby establishing an evaluation system for the compressive strength of broken rock blocks.

[0005] However, this method is not suitable for testing cement soil core samples. Due to the uneven cement content in the construction process, the strength of cement soil varies greatly. The results of pressure testing with multiple fragments cannot truly reflect the strength of a single fragment, and it is impossible to quickly and accurately test the strength of cement soil fragment core samples. Summary of the invention

[0006] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a cement soil fragment core sample strength testing system and testing method, which is used to solve the problems in the prior art that the transfer hole sampling cannot produce core samples that meet the standard size requirements and cannot quickly and accurately test the strength of cement soil fragment core samples.

[0007] In order to achieve the above-mentioned object and other related objects, the present invention provides a cement soil fragment core sample strength testing system, comprising:

[0008] A sample processing device, the sample processing device comprises a base, a rotating pillar rotatably arranged above the base, a first column vertically and fixedly connected to the base, a first support platform fixedly connected to the top of the first column, a loading part arranged at the top of the first support platform, a sample support platform vertically and fixedly connected to the top of the rotating pillar, a mixing and pouring part fixedly connected to the bottom of the first support platform, a plurality of sample tubes, and a rotating power assembly driving the rotating pillar to rotate, wherein the sample support platform has a plurality of grooves for placing the sample tubes along the circumference of its top.

[0009] A strength estimation device, wherein the strength estimation device is used to estimate the strength range of the standard sample;

[0010] A strength testing device, the strength testing device includes a bottom plate fixedly connected to the base, a second column rotatably and vertically mounted on the bottom plate, a workbench fixedly connected to the bottom plate, a second support, a pressing assembly, a strength testing assembly, a clamping portion arranged above the workbench, and a test operation screen fixedly connected to the second support, the second column side wall has an external thread, the second support has an internal thread matching the external thread on the second column, the strength testing assembly is arranged at the bottom of the second support for performing strength testing on a standard sample, and the second support is driven up and down by the pressing assembly to drive the strength testing assembly up and down.

[0011] Optionally, the loading part includes a solid barrel fixedly connected to the top of the first support platform and a liquid barrel fixedly connected to the top of the first support platform, the solid barrel and the liquid barrel are used to load kaolin and water glass respectively, the modulus of the water glass is 1.4, and the mass ratio of water glass / kaolin is 1.15.

[0012] Optionally, the mixing and pouring part includes a fixed box fixedly connected to the bottom of the first pedestal, a mixing tank rotatably connected to the bottom of the fixed box, a laser ranging mechanism fixedly connected to the outer wall of the mixing tank, a stirring column rotatably connected to the bottom of the fixed box, a control panel fixedly connected to the first pedestal, a stirring sheet, a driving mechanism, and a cleaning mechanism arranged in the mixing tank; the mixing tank is connected to the charging part through a feeding pipe passing through the fixed box; the stirring sheets are provided in plurality, and the plurality of stirring sheets are arranged at intervals along the axial and circumferential directions of the stirring column; the mixing tank has a coaxial discharge pipe at the bottom, the discharge pipe has an extraction pump and a discharge solenoid valve, and the driving mechanism drives the stirring column and the mixing tank to rotate in opposite directions to evenly mix the mixture in the mixing tank;

[0013] The driving mechanism and the cleaning mechanism cooperate with each other to thoroughly clean the stirring column, the stirring blade and the residual mixed material in the mixing tank.

[0014] Optionally, the driving mechanism includes a U-shaped frame fixedly connected to the bottom of the fixed box, a first gear rotatably connected to the U-shaped frame, a third gear coaxially fixedly matched with the stirring column, an internal gear coaxially fixedly matched with the inner wall of the mixing tank, and a driving member that drives the first gear to rotate, and the first gear is meshed with the internal gear and the third gear for transmission.

[0015] Optionally, the cleaning mechanism includes a water tank arranged on the top of the first support platform, an air source fixedly installed on the first support platform, an annular mixing chamber fixedly connected to the inner wall of the mixing tank and located below the driving mechanism, a linear telescopic module, a telescopic conveying module, and an annular scraper, the air source and the water tank are respectively connected to the inside of the annular mixing chamber through an air pipe and a water pipe passing through the fixed box, the air pipe is provided with an air pump and a switch control valve, the water pipe is provided with a water pump and a switch solenoid valve, the fixed end and the telescopic end of the linear telescopic module are respectively fixedly connected to the driving mechanism and the annular scraper, and the annular scraper is coaxially slidably matched with the inner wall of the mixing tank;

[0016] The telescopic conveying module is used to convey and spray the gas-water mixture or gas in the annular mixing chamber downward as the annular scraper moves downward.

[0017] Optionally, there are multiple telescopic conveying modules, and the multiple telescopic conveying modules are arranged at intervals along the circumference of the annular mixing chamber;

[0018] Each of the telescopic conveying modules includes a first tube body, a second tube body, a third tube body, a first cleaning nozzle, a second cleaning nozzle and a third cleaning nozzle. The first tube body is connected to the interior of the annular mixing chamber, the outer wall of the second tube body is coaxially slidably matched with the inner wall of the first tube body, the outer wall of the third tube body is coaxially slidably matched with the inner wall of the second tube body, the first cleaning nozzle is fixedly connected to the bottom end of the third tube body and is located below the annular scraper, the spraying direction of the first cleaning nozzle is toward the oblique downward direction of the inner wall of the mixing tank, the second cleaning nozzle and the third cleaning nozzle are both fixedly connected to the outer wall of the third tube body and connected to the interior, the spraying direction of the second cleaning nozzle is toward the oblique downward direction of the inner wall of the mixing tank, and the spraying direction of the third cleaning nozzle is toward the oblique downward direction of the central axis of the stirring column.

[0019] Optionally, the clamping portion includes two arc-shaped claws, a rotating shaft and two sliders, the two arc-shaped claws are respectively fixedly connected to the tops of the two sliders, and reinforcing ribs are provided between the sliders and the arc-shaped claws. A receiving groove for receiving standard samples is provided above the workbench, and a sliding groove slidably matched with the two sliders is provided below the receiving groove. The rotating shaft is rotatably arranged in the sliding groove, and the rotating shaft has two sections of threads of the same length but different rotation directions. The two sliders are respectively threadedly matched with threads of different rotation directions on the rotating shaft, and the two sliders are driven to move toward or in opposite directions on the rotating shaft at the same time by shaking the hand wheel to clamp or loosen the standard sample.

[0020] Optionally, the strength testing assembly comprises an improved strength rebound tester, a fixing block fixed to the end of the improved strength rebound tester, and a fixing rod fixed to the bottom of the second support platform, the improved strength rebound tester has four groups, and the elastic modulus of the built-in spring in each group of improved strength rebound testers is different, the fixing block has an inwardly concave threaded hole, and the fixing rod has an external thread that matches the threaded hole on the fixing block;

[0021] The test ranges of the strength of the standard samples tested by the four groups of improved strength rebound testers are 0~0.5MPa, 0.5~1.0MPa, 1.0~2.0MPa, and 2.0~5.0MPa, respectively.

[0022] Optionally, the strength estimation device includes a telescopic component fixed to the bottom of the second support platform, a fixed frame fixed to the telescopic end of the telescopic component, a scanner fixed to the fixed frame, a scanning data processor, and a scanning operation screen arranged on the second support platform. The top of the second support platform has a placement slot for placing a standard sample. The scanning data processor is connected to the scanning operation screen through a cable, and the fixed frame is driven by the telescopic component to drive the scanner up and down.

[0023] A testing method for a cement soil fragment core sample strength testing system, characterized in that it is applicable to the cement soil fragment core sample strength testing system described above, and comprises the following steps:

[0024] Placing the broken core samples: After the bottom surfaces of the multiple broken core samples are polished and leveled, they are placed in multiple sample tubes, and then the multiple sample tubes are respectively placed in the multiple grooves of the sample receiving platform;

[0025] Mixed material preparation: turn on the control panel, convey the material in the loading section to the mixing tank through the conveying pipe, and drive the stirring column and the mixing tank to rotate in opposite directions through the driving mechanism to evenly mix the mixed material in the mixing tank;

[0026] Preparation of standard samples: The laser distance measuring mechanism, the discharge solenoid valve and the extraction pump are turned on through the control panel, so that the mixture passes through the discharge pipe to fill and pour the internal gap of the sample tube. The laser distance measuring mechanism is used to measure the distance between the fixed point and the mixture in the sample tube. When the mixture fills the sample tube, the distance data is transmitted to the control panel. The control panel turns off the extraction pump and the discharge solenoid valve. At this time, the preparation of a single standard sample is completed. The control panel controls the rotation of the rotating support so that the next sample tube is located below the discharge pipe, and the next sample preparation is started until the preparation of the designed number of standard samples is completed;

[0027] Cleaning of the mixing and pouring part: through the control panel, the driving mechanism and the cleaning mechanism are simultaneously turned on to cooperate with each other to thoroughly clean the residual mixed material in the mixing tank;

[0028] Estimate sample strength: Estimate the strength range of standard samples through the strength estimation device;

[0029] Strength test: The downward pressure component drives the second support platform to move up and down, which drives the strength test component to move up and down to perform strength test on the standard sample. The test is performed three times in a row. If the range of the three test data is ≤30%, the average value is taken as the test result. If the range is greater than 30%, the standard sample is replaced and retested.

[0030] As described above, the cement soil fragment core sample strength testing system and testing method of the present invention have at least the following beneficial effects:

[0031] By using the sample processing device, the strength estimation device and the strength testing device, all steps from the preparation of the core sample to the strength test can be completed in one stop, which simplifies the operation process and improves the work efficiency. After the materials in the loading part are evenly mixed according to the designed mass ratio by the mixing and pouring part, the core sample of the broken piece is filled and poured, so that a standard sample that meets the standard size requirements can be obtained, thereby solving the problem of being unable to accurately evaluate the foundation reinforcement effect. The motor gear is driven by the pillar power part to rotate and drive the fixed gear to rotate, so that the rotating support is rotated, and then the sample bearing table is driven to rotate. The sample cylinder set in multiple grooves is convenient for batch standard sample preparation, which improves the efficiency of the sample processing link. The upper and lower power parts drive the long gear to rotate and drive the upper and lower gears to rotate. The upper and lower gears drive the second column to rotate, so that the rotational movement of the second column is converted into the up and down movement of the second bearing platform, and then drive the strength test assembly to perform strength test on the standard sample, so that the test can be automated, which significantly improves the test efficiency and accuracy, reduces the complexity and error of manual operation, and thus solves the problem of being unable to quickly and accurately test the strength of cement soil core samples. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Shown is a schematic diagram of the three-dimensional structure of the sample processing device of the present invention;

[0033] Figure 2 Shown is a schematic diagram of the three-dimensional structure of the strength testing device of the present invention;

[0034] Figure 3 It is a schematic diagram of the three-dimensional structure of the mixing and pouring part of the present invention;

[0035] Figure 4 It is a schematic diagram showing the internal structure of the mixing and pouring part of the present invention;

[0036] Figure 5 Shown is an enlarged view of part A of the present invention;

[0037] Figure 6 It is a schematic diagram of the three-dimensional structure of the clamping part of the present invention;

[0038] Figure 7 Shown is a schematic diagram of the three-dimensional structure of the sample tube of the present invention;

[0039] Figure 8 Shown is a schematic diagram of the strength test assembly structure of the present invention;

[0040] Fig. 9 Shown is a schematic diagram of the three-dimensional structure of the strength estimation device of the present invention.

[0041] Component number description

[0042] Sample processing device 1, base 11, rotating support 12, first column 13, first support platform 14, charging part 15, solid barrel 151, liquid barrel 152, sample support platform 16, groove 161, mixing and pouring part 17, fixed box 171, mixing tank 172, laser ranging mechanism 173, stirring column 174, control panel 175, stirring blade 176, driving mechanism 177, U-shaped frame 1771, first gear 1772, third gear 1774, internal gear 1775, driving member 1776, cleaning Mechanism 178, water tank 1781, air source 1782, annular mixing chamber 1783, linear telescopic module 1784, telescopic conveying module 1785, first tube body 17851, second tube body 17852, third tube body 17853, first cleaning nozzle 17854, second cleaning nozzle 17855, third cleaning nozzle 17856, annular scraper 1786, air pipe 1787, water pipe 1788, discharge pipe 179, extraction pump 1791, discharge solenoid valve 1792, sample cylinder 18;

[0043] Strength estimation device 2, telescopic component 21, fixing frame 22, scanner 23, scanning data processor 24, scanning operation screen 25, placement slot 26, cable 27;

[0044] Strength testing device 3, bottom plate 31, second column 32, workbench 33, second support platform 34, pressing assembly 35, strength testing assembly 36, improved strength rebound tester 361, fixing block 362, fixing rod 363, spring 364, clamping part 37, arc-shaped claw 371, rotating shaft 372, slider 373, reinforcing rib 374, accommodating groove 375, sliding groove 376, hand wheel 377, test operation screen 38;

[0045] Fragment core sample 4. DETAILED DESCRIPTION

[0046] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0047] See also Figures 1 to 9 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0048] The following embodiments are only for illustration purposes and can be combined with each other, and are not limited to the contents presented in the following single embodiments.

[0049] In this embodiment, please refer to Figures 1 to 9The present invention provides a strength test system for cement soil fragment core samples, comprising: a sample processing device 1, a strength estimation device 2 and a strength testing device 3, wherein the sample processing device 1 comprises a base 11, a rotating pillar 12 rotatably arranged above the base 11, a first column 13 vertically and fixedly connected to the base 11, a first support 14 fixedly connected to the top of the first column 13, a loading portion 15 arranged at the top of the first support 14, a sample receiving platform 16 vertically and fixedly connected to the top of the rotating pillar 12, a mixing and pouring portion 17 fixedly connected to the bottom of the first support 14, a plurality of sample tubes 18, and a rotating power assembly driving the rotating pillar 12 to rotate, wherein the sample receiving platform 16 has a plurality of grooves 161 for placing the sample tubes 18 along the circumference of its top, so that a plurality of sample tubes 18 can be placed at one time, so as to facilitate batch testing. The sample preparation work improves the efficiency of the sample processing link, and is particularly suitable for situations where a large number of samples are required for testing and comparison; the strength estimation device 2 is used to estimate the strength range of standard samples; the rotating power component includes a fixed gear coaxially fixedly matched with the side wall of the rotating pillar 12, a motor gear meshing with the fixed gear, and a pillar power member fixedly installed on the base 11. The pillar power member includes a motor or a hydraulic motor, and the output shaft of the pillar power member is coaxially fixedly connected with the motor gear. The fixed gear is driven to rotate by the pillar power member to drive the motor gear to rotate, so that the rotating support can be rotated. The gear meshing transmission method has the characteristics of precise transmission ratio and high transmission efficiency, which can ensure that the rotating pillar 12 is stable and rotates at the set speed and angle, which is helpful to achieve uniform and precise processing during operations such as processing samples.

[0050] The strength testing device 3 includes a bottom plate 31 fixedly connected to the base 11, a second column 32 rotatably and vertically mounted on the bottom plate 31, a workbench 33 fixedly connected to the bottom plate 31, a second support platform 34, a pressing assembly 35, a strength testing assembly 36, a clamping portion 37 provided above the workbench 33, and a test operation screen 38 fixedly connected to the second support platform 34. The second column 32 has an external thread on its side wall, and the second support platform 34 has an internal thread that matches the external thread on the second column 32. The strength testing assembly 36 is provided at the bottom of the second support platform 34 for performing strength testing on standard samples. The second support platform 34 is driven up and down by the pressing assembly 35, which drives the strength testing assembly 36 to move up and down. The pressing assembly 35 includes upper and lower gears coaxially fixedly matched with the second column 32, upper and lower power members fixedly mounted on the second support platform 34, and long gears meshing with the upper and lower gears. The output shafts of the upper and lower power members are coaxially fixedly connected with the long gears. The upper and lower power members include an electric motor or a hydraulic motor. The upper and lower power members drive the long gears to rotate, which drives the upper and lower gears to rotate. The upper and lower gears drive the second column 32 to rotate, so that the rotational motion of the second column 32 is converted into the up and down motion of the second support platform 34. During the up and down motion, the long gears are always in meshing state with the upper and lower gears.

[0051] By using the sample processing device 1, the strength estimation device 2 and the strength testing device 3, all steps from the preparation of the broken core sample 4 to the strength test can be completed in one stop, simplifying the operation process and improving work efficiency. After the materials in the charging part 15 are evenly mixed according to the designed mass ratio by the mixing and pouring part 17, the broken core sample 4 is filled and poured, so that a standard sample that meets the standard size requirements can be obtained, thereby solving the problem of being unable to accurately evaluate the foundation reinforcement effect. The motor gear is driven by the support power part to rotate to drive the fixed gear to rotate, so that the rotating support can be rotated, and then the sample support table 16 is driven to rotate. The sample tube 18 set in multiple grooves 161 is convenient for batch standard sample preparation work, which improves the efficiency of the sample processing link. The upper and lower gears are driven to rotate by the upper and lower power parts to drive the long gear to rotate, and the upper and lower gears drive the second column 32 to rotate, so that the rotational movement of the second column 32 is converted into the up and down movement of the second support platform 34, and then drive the strength test component 36 to perform strength test on the standard sample, so that automated testing can be performed, which significantly improves the test efficiency and accuracy, reduces the complexity and errors of manual operation, and thus solves the problem of being unable to quickly and accurately test the strength of the cement soil fragment core sample 4.

[0052] In this embodiment, please refer to Figure 1The loading part 15 includes a solid barrel 151 fixedly connected to the first support platform 14 and a liquid barrel 152 fixedly connected to the first support platform 14. The solid barrel and the liquid barrel 152 are used to load kaolin and water glass respectively. The modulus of water glass is 1.4, and the mass ratio of water glass to kaolin is 1.15. When the water glass with a modulus of 1.4 is combined with kaolin, it can produce a good bonding effect and improve the strength of the cement soil fragment core sample 4. The strength after solidification is between 30 and 50 MPa, which is much higher than the strength of the fragment core sample 4 (5). By placing kaolin and water glass in the solid barrel 151 and the liquid barrel 152 respectively, the operation process of preparing the standard sample can be simplified, and the ratio of the two materials can be accurately controlled when preparing the standard sample. The standard sample obtained after casting is cured at 60°C for 24 hours to complete the sample preparation.

[0053] In this embodiment, please refer to Figure 1 , Figures 3 to 5 The mixing and pouring part 17 includes a fixed box 171 fixedly connected to the bottom of the first support platform 14, a mixing tank 172 rotatably connected to the bottom of the fixed box 171, a laser distance measuring mechanism 173 fixedly connected to the outer wall of the mixing tank 172, a stirring column 174 rotatably connected to the bottom of the fixed box 171, a control panel 175 fixedly connected to the first support platform 14, a stirring sheet 176, a driving mechanism 177, and a cleaning mechanism 178 arranged in the mixing tank 172. The mixing tank is connected to the charging part 15 through a feeding pipe passing through the fixed box 171. The feeding pipe includes a first feeding pipe and a second feeding pipe. The mixing tank is connected to the solid material barrel 151 and the liquid material barrel 152 respectively through the first feeding pipe and the second feeding pipe, and the first feeding pipe and the second feeding pipe are both provided with a feeding solenoid valve and a feeding flow valve. There are multiple stirring blades 176, and the multiple stirring blades 176 are arranged at intervals along the axial and circumferential directions of the stirring column 174. The bottom of the mixing tank 172 has a coaxial discharge pipe 179, and the discharge pipe 179 has an extraction pump 1791 and a discharge solenoid valve 1792. The driving mechanism 177 drives the stirring column 174 and the mixing tank 172 to rotate in opposite directions to evenly mix the mixture in the mixing tank 172; the driving mechanism 177 and the cleaning mechanism 178 cooperate to thoroughly clean the stirring column 174, the stirring blades 176 and the residual mixture in the mixing tank 172. The laser ranging mechanism 173 includes a phase laser ranging sensor or an interference laser ranging sensor, which is used to measure the distance between the fixed point of the laser ranging mechanism 173 fixed to the outer wall of the mixing tank 172 and the liquid level in the sample tube 18 during pouring and filling.

[0054] The materials in the solid barrel 151 and the liquid barrel 152 are added to the mixing tank 172 in proportion through the feed solenoid valve and the feed flow valve on the first feed pipe and the second feed pipe, and the stirring column 174 and the mixing tank 172 are driven to rotate in opposite directions through the driving mechanism 177. When the mixing tank 172 rotates, the material is driven to rotate with it, and the stirring column 174 rotates in the opposite direction. The stirring blades 176 on the stirring column 174 will cut and stir the mixture in the opposite direction of the mixing tank 172, so that the materials added to the mixing tank 172 are fully stirred and mixed. The stirring blades 176 are arranged at intervals along the axial and circumferential directions of the stirring column 174, which further enhances the mixing effect, thereby achieving a more uniform mixing effect, and finally the discharge is controlled by the extraction pump 1791 and the discharge solenoid valve 1792 on the discharge pipe 179 at the bottom of the mixing tank 172. A cleaning mechanism 178 is provided in the mixing tank 172, and the driving mechanism 177 and the cleaning mechanism 178 cooperate with each other to thoroughly clean the stirring column 174, the stirring blade 176 and the residual mixture in the mixing tank 172, which is very important for the long-term use and maintenance of the equipment. After completing a mixing and pouring operation, the driving mechanism 177 and the cleaning mechanism 178 cooperate with each other to thoroughly clean the inside of the mixing tank 172 to avoid material residue, which affects the accuracy of subsequent tests and affects the service life of the mixing and pouring part 17.

[0055] In this embodiment, please refer to Figure 4 and Figure 5 The driving mechanism 177 includes a U-shaped frame 1771 fixed to the bottom of the fixed box 171, a first gear 1772 rotatably connected to the U-shaped frame 1771, a third gear 1774 coaxially fixedly matched with the stirring column 174, an internal gear 1775 coaxially fixedly matched with the inner wall of the mixing tank 172, and a driving member 1776 for driving the first gear 1772 to rotate. The driving member 1776 includes a motor. The first gear 1772 is meshed with the internal gear 1775 and the third gear 1774 for transmission. When the first gear 1772 transmits power to the internal gear 1775 and the third gear 1774, due to the different meshing conditions (such as the number of teeth, etc.) between the internal gear 1775 and the third gear 1774 and the first gear 1772, the power distribution ratio is the same or different, so that the rotation speed of the internal gear 1775 and the third gear 1774 is the same or different, thereby driving the rotation speed of the stirring column 174 and the mixing tank 172 to be the same or different. The first gear 1772 is driven to rotate by the driving member 1776, and at the same time, the internal gear 1775 and the third gear 1774 are driven to rotate in opposite directions, so that the stirring column 174 and the mixing tank 172 can rotate in opposite directions at the same speed or different speeds, thereby significantly improving the mixing uniformity and efficiency of the mixture.

[0056] In this embodiment, please refer to Figure 4 and Figure 5The cleaning mechanism 178 includes a water tank 1781 disposed on the top of the first support 14, an air source 1782 fixedly mounted on the first support 14, an annular mixing chamber 1783 fixedly connected to the inner wall of the mixing tank 172 and located below the driving mechanism 177, a linear telescopic module 1784, a telescopic conveying module 1785, and an annular scraper 1786. The air source 1782 and the water tank 1781 are respectively connected to the inside of the annular mixing chamber 1783 through an air pipe 1787 and a water pipe 1788 through the fixed box 171. The air pipe 1787 has an air pump and a switch control valve, and the water pipe 1788 is provided. It is provided with a water pump and a switch solenoid valve, the linear telescopic module 1784 includes a hydraulic rod, a pneumatic rod or an electric push rod, the fixed end and the telescopic end of the linear telescopic module 1784 are respectively fixedly connected to the driving mechanism 177 and the annular scraper 1786, and the annular scraper 1786 is coaxially slidably matched with the inner wall of the mixing tank 172; the telescopic conveying module 1785 is used to convey and spray the gas-water mixture or gas in the annular mixing chamber 1783 downward while the annular scraper 1786 moves downward, the gas source 1782 can blow hot air into the annular mixing chamber 1783, and the water tank 1781 can contain distilled water.

[0057] The driving mechanism 177 and the cleaning mechanism 178 cooperate with each other to thoroughly clean the residual mixed material in the stirring column 174, the stirring blade 176 and the mixing tank 172, wherein the thorough cleaning includes the first gas-water mixture cleaning and the second gas purge cleaning. During the first gas-water mixture cleaning, the gas source 1782 and the water tank 1781 blow hot air and provide water into the annular mixing chamber 1783 through the gas pipe 1787 and the water pipe 1788. When the hot air is mixed with water, the temperature of the water will be increased. The water with a higher temperature can better clean the residual materials during cleaning. The gas pipe 1787 and the water pipe 1788 are both provided with switch control valves, so that the air flow and The supply of water flow can be precisely controlled as needed. The linear telescopic module 1784 pushes the annular scraper 1786 to move downward, while driving the telescopic conveying module 1785 to move downward and convey the gas-water mixture in the annular mixing chamber 1783 downward for spraying. The gas-water mixture with a higher temperature can better clean the residual materials on the inner wall of the stirring column 174, the stirring blade 176 and the mixing tank 172 during cleaning. At the same time, the driving mechanism 177 drives the stirring column 174 and the mixing tank 172 to rotate in opposite directions, so that the stirring column 174 and the stirring blade 176 use centrifugal force to throw away the residual materials. The mixing tank 172 rotates with the stirring blade 176 at the same time. The annular scraper 1786 cooperates with cutting to cut and scrape off the solidified material remaining on the inner wall of the mixing tank 172. The cleaning of the gas-water mixture can not only reduce the use of water and save water, but also achieve thorough cleaning of the residual materials. After the first gas-water mixture cleaning is completed, the linear telescopic module 1784 returns to the initial position; when the second gas purge is performed, the water pipe 1788 is closed, and the gas source 1782 blows hot air into the annular mixing chamber 1783 through the gas pipe 1787. The linear telescopic module 1784 pushes the annular scraper 1786 to move downward, while driving the telescopic conveying module 1785 to move downward and transport the gas in the annular mixing chamber 1783 downward The hot air is sprayed out and can quickly dry the residual water droplets on the inner wall of the stirring column 174, the stirring blade 176 and the mixing tank 172. At the same time, the driving mechanism 177 drives the stirring column 174 and the mixing tank 172 to rotate in opposite directions, so that the stirring column 174 and the stirring blade 176 can use centrifugal force to shake off the residual water droplets, which can achieve an all-round drying effect. After the linear telescopic module 1784 moves to the bottom of the mixing tank 172, it continues to blow hot air for a period of time, which can effectively dry the residual water droplets on the inner wall of the discharge pipe 179, the extraction pump 1791 in the discharge pipe 179 and the discharge solenoid valve 1792, thereby effectively improving the service life and preventing damage.

[0058] In this embodiment, please refer to Figure 4 and Figure 5 The telescopic conveying modules 1785 include a plurality of telescopic conveying modules 1785, and the plurality of telescopic conveying modules 1785 are arranged at intervals along the circumference of the annular mixing chamber 1783;

[0059] Each of the telescopic conveying modules 1785 comprises a first tube body 17851, a second tube body 17852, a third tube body 17853, a first cleaning nozzle 17854, a second cleaning nozzle 17855 and a third cleaning nozzle 17856. The first tube body 17851 is connected to the interior of the annular mixing chamber 1783, the outer wall of the second tube body 17852 is coaxially slidably matched with the inner wall of the first tube body 17851, the outer wall of the third tube body 17853 is coaxially slidably matched with the inner wall of the second tube body 17852, and the first cleaning nozzle 17854 is connected to the interior of the annular mixing chamber 1783. 4 is fixedly connected to the bottom end of the third tube body 17853 and is located below the annular scraper 1786, the first cleaning nozzle 17854 sprays in a direction toward the oblique downward direction of the inner wall of the mixing tank 172, the second cleaning nozzle 17855 and the third cleaning nozzle are both fixedly connected to the outer wall of the third tube body 17853 and connected to the interior, the second cleaning nozzle 17855 sprays in a direction toward the oblique downward direction of the inner wall of the mixing tank 172, and the third cleaning nozzle sprays in a direction toward the oblique downward direction of the central axis of the stirring column 174.

[0060] By arranging multiple telescopic conveying modules 1785 at intervals along the circumference of the annular mixing chamber 1783, it can be ensured that during the cleaning process, cleaning nozzles can be operated from all positions in the circumferential direction of the inner wall of the mixing tank 172, effectively avoiding the occurrence of cleaning dead corners. During the cleaning process, when the annular scraper 1786 moves up and down, the coaxial sliding cooperation between the second tube body 17852 and the first tube body 17851, and the third tube body 17853 and the second tube body 17852 can be extended and retracted accordingly according to the position change of the annular scraper 1786, which can adapt to the cleaning needs of different height positions in the mixing tank 172, ensure the accuracy and comprehensiveness of the cleaning, and also realize the function of accelerating the ejection of the gas-water mixture or gas. Through the first cleaning nozzle 17854 and the annular scraper 1786 The cooperation between the first cleaning nozzle 17854 and the mixing tank 172 enables the first cleaning nozzle 17854 to preliminarily clean the inner wall of the mixing tank 172, and the annular scraper 1786 and the mixing tank 172 rotate to produce a cutting force to remove the solidified residual materials for the second time. The second cleaning nozzle 17855 performs three cleanings, which improves the targeted cleaning, thereby effectively improving the cleaning efficiency and quality. The third cleaning nozzle 17856 rotates with the stirring column 174 and the stirring blade 176 to produce centrifugal force to quickly clean the residual materials. The design that the first cleaning nozzle 17854, the second inclined nozzle and the third cleaning nozzle 17856 all spray the gas-water mixture or gas obliquely downward can make the gas-water mixture or gas form a downward flushing force after being sprayed, which can maximize the use of cleaning flushing and a large coverage area.

[0061] In this embodiment, please refer to Figure 6The clamping portion 37 includes two arc-shaped claws 371, a rotating shaft 372 and two sliders 373. The two arc-shaped claws 371 are respectively fixed to the tops of the two sliders 373. The bottoms of the arc-shaped claws 371 can be in contact with the top of the workbench 33. A reinforcing rib 374 is provided between the slider 373 and the arc-shaped claw 371. The reinforcing rib 374 provided between the slider 373 and the arc-shaped claw 371 can enhance the strength and rigidity of the arc-shaped claw 371. The top of the workbench 33 has a storage space for accommodating standard samples. The receiving groove 375 has a sliding groove 376 below the receiving groove 375, which is slidably matched with the two sliders 373. The rotating shaft 372 is rotatably arranged in the sliding groove 376. The rotating shaft 372 has two sections of threads of the same length but different rotation directions. The two sliders 373 respectively cooperate with the threads of different rotation directions on the rotating shaft 372. The two sliders 373 are driven to move toward or in the opposite direction on the rotating shaft 372 by shaking the hand wheel 377 to clamp or loosen the standard sample. The two sliders 373 are driven to move toward or in the opposite direction on the rotating shaft 372 by shaking the hand wheel 377 to clamp or loosen the standard sample. The two arc-shaped claws 371 can evenly apply clamping force or loosening force to the standard sample placed in the receiving groove 375.

[0062] In this embodiment, please refer to Figure 2 and Figure 8 The strength testing assembly 36 includes an improved strength rebound tester 361, a fixing block 362 fixed to the end of the improved strength rebound tester 361, and a fixing rod 363 fixed to the bottom of the second support platform 34. The improved strength rebound tester 361 has four groups, and the elastic modulus of the built-in spring 364 in each group of the improved strength rebound tester 361 is different. The other parts of the improved strength rebound tester 361 apply the existing technology and are not repeated here. The fixing block 362 has an inwardly concave threaded hole, and the fixing rod 363 has an external thread that matches the threaded hole on the fixing block 362; the test ranges of the strength of the standard samples tested by the four groups of the improved strength rebound testers 361 are 0~0.5MPa, 0.5~1.0MPa, 1.0~2.0MPa, and 2.0~5.0MPa, respectively.

[0063] The design of the strength testing assembly 36 has multiple sets of improved strength rebound testers 361, and the elastic modulus of the built-in springs 364 in each set is different, which can cover a wide test range from 0 to 5.0 MPa and can better adapt to the strength characteristics of the standard samples. During the test, the appropriate elastic modulus of the springs 364 can ensure that the improved strength rebound tester 361 has sufficient sensitivity within the measuring range, and can accurately test standard samples of different strength levels, thereby improving the accuracy, reliability and applicability of the test.

[0064] In this embodiment, please refer to Figure 2 and Fig. 9 The strength estimation device 2 includes a telescopic component 21 fixed to the bottom of the second support platform 34, a fixed frame 22 fixed to the telescopic end of the telescopic component 21, a scanner 23 fixed to the fixed frame 22, a scanning data processor 24, and a scanning operation screen 25 arranged on the second support platform 34. The top of the second support platform 34 has a placement groove 26 for placing standard samples. The scanning data processor 24 is connected to the scanning operation screen 25 through a cable 27. The scanner 23 includes an X-ray computed tomography (XCT) instrument or a laser particle size analyzer. The scanner 23 can scan the cement and soil particle grading of the standard sample. The fixed frame 22 is driven by the telescopic component 21 to drive the scanner 23 to move up and down. The telescopic component 21 includes a hydraulic rod, a pneumatic rod or an electric push rod. The scanner 23 is driven up and down by the telescopic component 21 to drive the fixed frame 22, so that the scanner 23 can adjust its position according to the height of the standard sample, so as to adapt to samples of different sizes, and it is also convenient for the scanner 23 to focus and scan. The scanner 23 works in conjunction with the scanning data processor 24 to efficiently process the scanned data, so as to obtain the estimated strength of the standard sample, which is convenient for selecting different strength test components 36, reducing the adjustment time and complexity during the test, and improving work quality and efficiency.

[0065] In this embodiment, please refer to Figures 1 to 9 A testing method for a cement soil fragment core sample strength testing system, characterized in that it is applicable to the cement soil fragment core sample strength testing system described above, comprising the following steps:

[0066] Placing the broken core samples 4: After the bottom surfaces of the multiple broken core samples 4 are polished and leveled, they are placed in the multiple sample tubes 18, and then the multiple sample tubes 18 are respectively placed in the multiple grooves 161 of the sample receiving platform 16;

[0067] Mixture preparation: Turn on the control panel 175, transport the water glass in the liquid barrel 152 and the metakaolin in the solid barrel 151 to the mixing tank 172 through the feed pipe at a mass ratio of 1.15, and drive the stirring column 174 and the mixing tank 172 to rotate in opposite directions through the driving mechanism 177 to evenly mix the mixture in the mixing tank 172;

[0068] Preparation of standard samples: The laser distance measuring mechanism, the discharge solenoid valve 1792 and the extraction pump 1791 are turned on through the control panel 175, so that the mixture passes through the discharge pipe 179 to fill and pour the internal space of the sample tube 18. The laser distance measuring mechanism is used to measure the distance between the fixed point and the mixture in the sample tube 18. When the mixture fills the sample tube 18, the distance data is transmitted to the control panel 175. The control panel 175 turns off the extraction pump 1791 and the discharge solenoid valve 1792. At this time, the preparation of a single standard sample is completed. The control panel 175 controls the rotation of the rotating support 12 to make the next sample tube 18 located below the discharge pipe 179, and starts the next sample preparation until the preparation of the designed number of standard samples is completed.

[0069] Cleaning of the mixing and pouring part: through the control panel 175, the driving mechanism 177 and the cleaning mechanism 178 are simultaneously turned on to cooperate with each other to thoroughly clean the residual mixed material in the mixing tank 172;

[0070] Estimating sample strength: estimating the strength range of standard samples by the strength estimation device 2; placing each standard sample in the placement slot 26 on the workbench 33, controlling the telescopic assembly 21 to be telescopic by the scanning operation screen 25 so that the scanner 23 is adjusted to a suitable height, the scanner 23 scans the cement and soil particle gradations of the standard samples, and the scanning data processor 24 processes the scanning results of the scanner 23 to estimate the strength range of the standard samples;

[0071] Strength test: The pressing component 35 drives the second support platform 34 to move up and down, thereby driving the strength testing component 36 to move up and down to perform strength test on the standard sample. The test is performed three times in a row. If the range of the three test data is ≤30%, the average value is taken as the test result. If the range is greater than 30%, the standard sample is replaced and retested. According to the estimated strength of the standard sample, an improved strength rebound tester 361 of a suitable range is selected, and the fixed block is threadedly connected to the fixing rod 363 at the bottom of the second support platform 34. After the prepared standard sample is placed at a suitable position on the workbench 33, the clamping part 37 is used to clamp the standard sample, and the test operation screen 38 is opened to start the test. The pressing component 35 drives the second support platform 34 to move downward, thereby driving the improved strength rebound tester 361 to press down to test the strength of the standard sample. The test is performed three times in a row. If the range of the three test data is ≤30%, the average value is taken as the test result. If the range is greater than 30%, the standard sample is replaced and retested.

[0072] In summary, the present invention can complete all steps from preparing the broken core sample 4 to testing the strength in one stop by using the sample processing device 1, the strength estimation device 2 and the strength testing device 3, thereby simplifying the operation process and improving work efficiency. After the materials in the charging part 15 are evenly mixed according to the designed mass ratio by the mixing and pouring part 17, the broken core sample 4 is filled and poured, so that a standard sample that meets the standard size requirements can be obtained, thereby solving the problem of being unable to accurately evaluate the foundation reinforcement effect. The motor gear is driven by the support power part to rotate to drive the fixed gear to rotate, so that the rotating support can be rotated, and then the sample support table 16 is driven to rotate. The sample tube 18 arranged in a plurality of grooves 161 is convenient for batch preparation of standard samples, thereby improving the efficiency of the sample processing link. The upper and lower gears are driven to rotate by the upper and lower power members, and the upper and lower gears drive the second column 32 to rotate, so that the rotational movement of the second column 32 is converted into the up and down movement of the second support 34, and then the strength test assembly 36 is driven to perform strength test on the standard sample, so that the test can be automated, which significantly improves the test efficiency and accuracy, reduces the complexity and error of manual operation, and solves the problem of being unable to quickly and accurately test the strength of the cement soil fragment core sample 4. Therefore, the present invention effectively overcomes various shortcomings in the prior art and has a high industrial utilization value.

[0073] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A cement soil fragment core sample strength testing system, characterized in that: include: A sample processing device, the sample processing device comprises a base, a rotating pillar rotatably arranged above the base, a first column vertically and fixedly connected to the base, a first support platform fixedly connected to the top of the first column, a loading part arranged at the top of the first support platform, a sample support platform vertically and fixedly connected to the top of the rotating pillar, a mixing and pouring part fixedly connected to the bottom of the first support platform, a plurality of sample tubes, and a rotating power assembly driving the rotating pillar to rotate, wherein the sample support platform has a plurality of grooves for placing the sample tubes along the circumference of its top. A strength estimation device, wherein the strength estimation device is used to estimate the strength range of the standard sample; A strength testing device, the strength testing device comprising a bottom plate fixedly connected to the base, a second column rotatably and vertically mounted on the bottom plate, a workbench fixedly connected to the bottom plate, a second support, a pressing assembly, a strength testing assembly, a clamping portion arranged above the workbench, and a test operation screen fixedly connected to the second support, the side wall of the second column having an external thread, the second support having an internal thread matched with the external thread on the second column, the strength testing assembly being arranged at the bottom of the second support for performing strength testing on a standard sample, and the second support being driven up and down by the pressing assembly to drive the strength testing assembly to move up and down; The mixing and pouring part includes a fixed box fixedly connected to the bottom of the first pedestal, a mixing tank rotatably connected to the bottom of the fixed box, a laser distance measuring mechanism fixedly connected to the outer wall of the mixing tank, a stirring column rotatably connected to the bottom of the fixed box, a control panel fixedly connected to the first pedestal, a stirring sheet, a driving mechanism, and a cleaning mechanism arranged in the mixing tank. The mixing tank is connected to the charging part through a feeding pipe passing through the fixed box. There are a plurality of stirring sheets, which are arranged at intervals along the axial and circumferential directions of the stirring column. A coaxial discharge pipe is provided at the bottom of the mixing tank, and an extraction pump and a discharge solenoid valve are provided on the discharge pipe. The driving mechanism drives the stirring column and the mixing tank to rotate in opposite directions to evenly mix the mixed materials in the mixing tank. The driving mechanism and the cleaning mechanism cooperate to thoroughly clean the stirring column, the stirring blade and the residual mixed material in the mixing tank; The cleaning mechanism includes a water tank arranged on the top of the first support platform, an air source fixedly installed on the first support platform, an annular mixing chamber fixedly connected to the inner wall of the mixing tank and located below the driving mechanism, a linear telescopic module, a telescopic conveying module, and an annular scraper. The air source and the water tank are respectively connected to the inside of the annular mixing chamber through an air pipe and a water pipe passing through the fixed box. The air pipe is provided with an air pump and a switch control valve, and the water pipe is provided with a water pump and a switch solenoid valve. The fixed end and the telescopic end of the linear telescopic module are respectively fixedly connected to the driving mechanism and the annular scraper, and the annular scraper is coaxially slidably matched with the inner wall of the mixing tank. The telescopic conveying module is used to convey and spray the gas-water mixture or gas in the annular mixing chamber downward as the annular scraper moves downward.

2. The cement soil fragment core sample strength testing system according to claim 1, characterized in that: The loading part includes a solid barrel fixedly connected to the top of the first support platform and a liquid barrel fixedly connected to the top of the first support platform. The solid barrel and the liquid barrel are used to load kaolin and water glass respectively. The modulus of the water glass is 1.4, and the mass ratio of water glass / metakaolin is 1.

15.

3. The cement soil fragment core sample strength testing system according to claim 1, characterized in that: The driving mechanism includes a U-shaped frame fixedly connected to the bottom of the fixed box, a first gear rotatably connected to the U-shaped frame, a third gear coaxially fixedly matched with the stirring column, an internal gear coaxially fixedly matched with the inner wall of the mixing tank, and a driving member driving the first gear to rotate, and the first gear is meshed with the internal gear and the third gear for transmission.

4. The cement soil fragment core sample strength testing system according to claim 1, characterized in that: There are a plurality of telescopic conveying modules, and the plurality of telescopic conveying modules are arranged at intervals along the circumference of the annular mixing chamber; Each of the telescopic conveying modules includes a first tube body, a second tube body, a third tube body, a first cleaning nozzle, a second cleaning nozzle and a third cleaning nozzle. The first tube body is connected to the interior of the annular mixing chamber, the outer wall of the second tube body is coaxially slidably matched with the inner wall of the first tube body, the outer wall of the third tube body is coaxially slidably matched with the inner wall of the second tube body, the first cleaning nozzle is fixedly connected to the bottom end of the third tube body and is located below the annular scraper, the spraying direction of the first cleaning nozzle is toward the oblique downward direction of the inner wall of the mixing tank, the second cleaning nozzle and the third cleaning nozzle are both fixedly connected to the outer wall of the third tube body and connected to the interior, the spraying direction of the second cleaning nozzle is toward the oblique downward direction of the inner wall of the mixing tank, and the spraying direction of the third cleaning nozzle is toward the oblique downward direction of the central axis of the stirring column.

5. The cement soil fragment core sample strength testing system according to claim 1, characterized in that: The clamping part includes two arc-shaped claws, a rotating shaft and two sliders, the two arc-shaped claws are respectively fixedly connected to the tops of the two sliders, and reinforcing ribs are provided between the sliders and the arc-shaped claws. A receiving groove for receiving standard samples is provided above the workbench, and a sliding groove slidably matched with the two sliders is provided below the receiving groove. The rotating shaft is rotatably arranged in the sliding groove, and the rotating shaft has two sections of threads of the same length but different rotation directions. The two sliders are respectively threadedly matched with threads of different rotation directions on the rotating shaft, and the two sliders are driven to move toward or in opposite directions on the rotating shaft at the same time by shaking the hand wheel to clamp or loosen the standard sample.

6. The cement soil fragment core sample strength testing system according to claim 1, characterized in that: The strength test assembly includes an improved strength rebound tester, a fixing block fixed to the end of the improved strength rebound tester, and a fixing rod fixed to the bottom of the second support platform. The improved strength rebound tester has four groups, and the elastic modulus of the built-in spring in each group of the improved strength rebound tester is different. The fixing block has an inwardly concave threaded hole, and the fixing rod has an external thread that matches the threaded hole on the fixing block. The test ranges of the strength of the standard samples tested by the four groups of improved strength rebound testers are 0~0.5MPa, 0.5~1.0MPa, 1.0~2.0MPa, and 2.0~5.0MPa, respectively.

7. The cement soil fragment core sample strength testing system according to claim 1, characterized in that: The strength estimation device includes a telescopic component fixed to the bottom of the second support platform, a fixed frame fixed to the telescopic end of the telescopic component, a scanner fixed to the fixed frame, a scanning data processor, and a scanning operation screen arranged on the second support platform. The top of the second support platform has a placement slot for placing standard samples. The scanning data processor is connected to the scanning operation screen through a cable, and the fixed frame is driven by the telescopic component to drive the scanner up and down.

8. A testing method for a cement soil fragment core sample strength testing system, characterized in that: The cement soil fragment core sample strength testing system applicable to claim 1 comprises the following steps: Placing the broken core samples: After the bottom surfaces of the multiple broken core samples are polished and leveled, they are placed in multiple sample tubes, and then the multiple sample tubes are respectively placed in the multiple grooves of the sample receiving platform; Mixed material preparation: turn on the control panel, convey the material in the loading section to the mixing tank through the conveying pipe, and drive the stirring column and the mixing tank to rotate in opposite directions through the driving mechanism to evenly mix the mixed material in the mixing tank; Preparation of standard samples: The laser distance measuring mechanism, the discharge solenoid valve and the extraction pump are turned on through the control panel, so that the mixture passes through the discharge pipe to fill and pour the internal gap of the sample tube. The laser distance measuring mechanism is used to measure the distance between the fixed point and the mixture in the sample tube. When the mixture fills the sample tube, the distance data is transmitted to the control panel. The control panel turns off the extraction pump and the discharge solenoid valve. At this time, the preparation of a single standard sample is completed. The control panel controls the rotation of the rotating support so that the next sample tube is located below the discharge pipe, and the next sample preparation is started until the preparation of the designed number of standard samples is completed; Cleaning of the mixing and pouring part: through the control panel, the driving mechanism and the cleaning mechanism are simultaneously turned on to cooperate with each other to thoroughly clean the residual mixed material in the mixing tank; Estimate sample strength: Estimate the strength range of standard samples through the strength estimation device; Strength test: The downward pressure component drives the second support platform to move up and down, which drives the strength test component to move up and down to perform strength test on the standard sample. The test is performed three times in a row. If the range of the three test data is ≤30%, the average value is taken as the test result. If the range is greater than 30%, the standard sample is replaced and retested.

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