Soil layer strength detection mechanism suitable for foundation pit grouting reinforcement

Abstract

The application belongs to the technical field of soil layer reinforcement detection, and discloses a soil layer strength detection mechanism suitable for foundation pit grouting reinforcement, which comprises a protection cylinder, a supporting mechanism, a positioning plate, a locking piece, a driving piece, a measuring steel needle, a sampling groove and the like. The measuring steel needle is fixedly connected to the bottom of the positioning plate and extends out of the protection cylinder at the lower end. The sampling groove is arranged at the lower end of the measuring steel needle and is used for allowing soil samples to enter during the process of the measuring steel needle penetrating into the soil layer to be detected. The first spring in the force storage state instantaneously extends to push the measuring steel needle to penetrate into the soil layer to be detected. According to the penetration depth, the strength of the soil layer reinforcement can be known. During the process of the measuring steel needle penetrating into the soil layer, the soil samples can enter the sampling groove and be stored. When the measuring steel needle is taken out of the soil layer, the soil samples can be taken out, and the soil layer strength detection and soil sampling can be simultaneously completed, so that the overall detection efficiency is greatly improved.

Description

Technical Field

[0001] This invention belongs to the field of soil reinforcement testing technology, and specifically relates to a soil strength testing mechanism suitable for foundation pit grouting reinforcement. Background Technology

[0002] During the construction of foundation pits, grouting is typically used to reinforce the surrounding soil layers to prevent pit wall collapse, groundwater seepage, and ground settlement. After grouting, the soil layers need to be tested to check if their strength meets requirements. Some companies may also test whether the soil strength meets requirements due to grout penetration and whether the soil strength does not meet requirements because the grout did not penetrate, in order to verify the effectiveness of the grouting reinforcement.

[0003] Existing methods for soil strength testing mostly employ the penetration method, which uses a compression spring to instantly push and measure the depth of a steel nail penetrating the soil layer to determine soil strength. After testing the soil strength, a soil sampling device is used to take samples separately. Since multiple areas of soil need to be tested, and soil strength testing and soil sampling cannot be performed simultaneously, this greatly reduces the overall testing efficiency. Therefore, we propose a soil strength testing device suitable for foundation pit grouting reinforcement to solve the above problems. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a soil strength testing mechanism suitable for foundation pit grouting reinforcement, which solves the problem that soil strength testing and soil sampling cannot be performed simultaneously, resulting in low overall testing efficiency.

[0005] This invention is achieved through the following solution: a soil strength testing mechanism suitable for foundation pit grouting reinforcement, comprising: Protective casing; The support mechanism, connected to the outside of the protective cylinder, is used to support the protective cylinder above the soil layer to be tested; A positioning plate is movably disposed inside the protective cylinder along the height direction of the protective cylinder, and a first spring is fixedly connected to the top of the positioning plate; The locking element has a locked state that prevents the positioning plate from moving downward relative to the protective cylinder and an unlocked state that allows the positioning plate to move downward relative to the protective cylinder; A driving component is fixed to the outside of the protective cylinder, and the output end of the driving component extends into the inside of the protective cylinder and is connected to the first spring. It is used to pull up or press down the first spring. When the locking component is in the locked state, the first spring can be compressed and stored. A measuring steel needle is fixedly connected to the bottom of a positioning plate, with a protective cylinder extending from the lower end of the needle. The locking mechanism switches from a spring-loaded state to an unlocked state, causing the positioning plate to be pushed downwards by the spring, thereby driving the measuring steel needle into the soil layer to be tested, thus achieving soil strength testing. The sampling slot, located at the lower end of the measuring needle, is used to allow soil samples to enter as the measuring needle penetrates the soil layer to be tested.

[0006] A further improvement of the present invention for soil strength testing mechanism for foundation pit grouting reinforcement is that it also includes a feeding mechanism for jacking soil samples out of the sampling trough.

[0007] A further improvement of the soil strength testing mechanism for foundation pit grouting reinforcement of the present invention is that the feeding mechanism includes a push rod, a piston plate, a movable cavity, and a first one-way valve. The movable cavity is opened at the upper end of the measuring steel needle and communicates with the sampling groove. One end of the push rod is fixedly connected to the output end of the driving component, and the other end of the push rod movably passes through the positioning plate and extends into the movable cavity. The piston plate is fixedly connected to the other end of the push rod. The first one-way valve is set on the piston plate and is used to connect the area above the piston plate and the area below the piston plate. During the process of the first spring pushing the positioning plate to drive the measuring steel needle to penetrate the soil layer to be tested, the piston plate moves upward relative to the movable chamber, so that the gas in the area above the piston plate of the movable chamber enters the area below the piston plate of the movable chamber through the first one-way valve to achieve gas storage. When the locking member is locked, the drive unit presses down the push rod, causing the piston plate to compress the gas in the area below the piston plate in the active chamber, and the high-pressure gas pushes the soil sample out of the sampling slot.

[0008] A further improvement of the present invention for a soil strength testing mechanism for foundation pit grouting reinforcement is that the locking component includes a storage box and a stop block. The storage box is fixed to the protective cylinder, and the stop block is slidably connected inside the storage box. The sliding direction of the stop block is perpendicular to the compression direction of the first spring. The stop block extends out of the storage box to the bottom of the positioning plate to lock the locking component. The stop block retracts into the storage box to unlock the locking component.

[0009] A further improvement of the present invention for soil strength testing mechanism for foundation pit grouting reinforcement is that the locking component further includes a driving mechanism for driving the stop block to extend out of or retract into the storage box.

[0010] A further improvement of the present invention for a soil strength testing mechanism for foundation pit grouting reinforcement is that the driving mechanism includes a second spring and a pull rope. The second spring is fixedly connected inside the storage box and fixedly connected to the stop block. One end of the pull rope is fixedly connected to the stop block, and the other end extends out of the storage box to form an operating end. By pulling the pull rope through the operating end, the stop block is pulled to compress the second spring and retract into the storage box. By releasing the pull rope, the compressed second spring pushes the stop block out of the storage box.

[0011] A further improvement of the present invention for a soil strength testing mechanism applicable to foundation pit grouting reinforcement is that the measuring steel needle is rotatably connected to the bottom of the positioning plate, and the soil strength testing mechanism also includes a guide for controlling the rotation of the measuring steel needle when it is raised or lowered.

[0012] A further improvement of the present invention for soil strength testing mechanism for foundation pit grouting reinforcement is that the guide component includes a guide rod, a spiral guide groove and a ball bearing. The guide rod is fixed to the inner wall of the protective cylinder, the spiral guide groove is opened outside the measuring steel needle, and the ball bearing is fixed to the guide rod and can slide along the spiral guide groove.

[0013] A further improvement of the present invention for soil strength testing mechanism for foundation pit grouting reinforcement is that the support mechanism includes two legs and two shafts, the two shafts are respectively fixedly connected to both sides of the protective cylinder, and the two legs are respectively rotatably sleeved on the two shafts. The support mechanism also includes a fixing component for fixing the two legs to the two shafts respectively.

[0014] A further improvement of the present invention for soil strength testing mechanism for foundation pit grouting reinforcement is that the outer surface of the measuring steel needle is provided with a scale.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention utilizes a first spring in a stored state to instantly extend and push a measuring steel needle into the soil layer to be tested. The depth of penetration indicates the strength of the soil layer reinforcement. During the penetration process, soil samples can be stored in a sampling trench. When the measuring steel needle is removed from the soil layer, the soil sample is also taken out. This allows for simultaneous soil strength testing and soil sampling, greatly improving overall testing efficiency. Furthermore, soil strength testing and soil sampling only leave a single hole, causing less damage to the soil layer compared to traditional separate methods, thus reducing the labor intensity of subsequent repairs. Attached Figure Description

[0016] Figure 1 A schematic diagram of the appearance of the present invention is shown.

[0017] Figure 2A schematic cross-sectional view of the present invention is shown.

[0018] Figure 3 The present invention is shown. Figure 2 Enlarged diagram of point A in the middle.

[0019] Figure 4 A schematic diagram of the location of the spiral guide groove of the present invention is shown.

[0020] Figure 5 A schematic diagram of the feeding mechanism of the present invention is shown.

[0021] In the diagram: 1. Protective cylinder; 2. Support mechanism; 201. Support leg; 202. Shaft; 203. Fixing sleeve; 204. Bolt; 3. Driving component; 4. Locking component; 401. Lifting plate; 402. Pull rope; 403. Storage box; 404. Stop block; 405. Second spring; 5. Measuring steel needle; 501. Penetration section; 502. Shaft section; 503. Sampling groove; 504. Inlet and outlet; 6. Positioning plate; 7. First spring; 8. Connecting plate; 9. Limiting rod; 10. Handle; 11. Protective cover; 12. Guide rod; 13. Spiral guide groove; 14. Feeding mechanism; 141. Movable cavity; 142. Push rod; 143. Piston plate; 144. First one-way valve; 145. Air inlet pipe. Detailed Implementation

[0022] To address the problem of low overall testing efficiency caused by the inability to simultaneously perform soil strength testing and soil sampling, this invention provides a soil strength testing mechanism suitable for foundation pit grouting reinforcement. The following detailed description, in conjunction with the accompanying drawings, provides further illustration of this soil strength testing mechanism suitable for foundation pit grouting reinforcement.

[0023] See Figures 1-5 As shown, a soil strength testing mechanism suitable for foundation pit grouting reinforcement includes: Protective cylinder 1; Support mechanism 2 is connected to the outside of protective cylinder 1 and is used to support protective cylinder 1 above the soil layer to be tested; The positioning plate 6 is movable inside the protective cylinder 1 along the height direction of the protective cylinder, and the top of the positioning plate 6 is fixedly connected to the first spring 7; A locking element is movably disposed on the protective cylinder. The locking element has a locked state that is inserted into the moving path of the positioning plate to prevent the positioning plate from moving downward, and an unlocked state that is retracted out of the moving path of the positioning plate to allow the positioning plate to move downward. The driving component 3 is fixed to the outside of the protective cylinder 1, and the output end of the driving component 3 extends into the inside of the protective cylinder 1 and is connected to the first spring 7. It is used to pull up or press down the first spring 7. When the locking component 4 is in the locked state, the driving component 3 can press down the first spring 7 to compress and store the first spring 7. The measuring steel needle 5 is fixedly connected to the bottom of the positioning plate 6, and the lower end of the measuring steel needle 5 extends out of the protective cylinder 1. The locking member 4 switches to the unlocked state when the first spring 7 is in a charged state, so that the positioning plate is pushed down by the first spring 7, thereby driving the measuring steel needle 5 to penetrate into the soil layer to be tested, so as to realize the soil strength test; and The sampling groove 503 is located at the lower end of the measuring steel needle 5 and is used to allow soil samples to enter during the process of the measuring steel needle 5 penetrating the soil layer to be tested.

[0024] The first spring 7, in its stored state, extends instantaneously to push the measuring steel needle 5 into the soil layer to be tested. The depth of penetration indicates the strength of the soil layer reinforcement. During the penetration process, the soil sample can be stored in the sampling slot 503. When the measuring steel needle 5 is removed from the soil layer, the soil sample can be taken out with it. Soil strength testing and soil sampling can be completed simultaneously, greatly improving the overall testing efficiency. Moreover, soil strength testing and soil sampling only leave a single hole, which is less damaging to the soil layer compared to the traditional separate methods, reducing the labor intensity of subsequent repairs.

[0025] Further, see Figure 1-2 As shown, handles 10 are fixedly connected to both sides of the protective cylinder 1, making it convenient for operators to hold and carry the entire testing mechanism.

[0026] It also includes a feeding mechanism 14, which is used to push the soil sample out of the sampling trough 503.

[0027] The feeding mechanism 14 includes a push rod 142, a piston plate 143, a movable chamber 141, and a first one-way valve 144. The movable chamber 141 is located at the upper end of the measuring steel needle 5 and communicates with the sampling groove 503. One end of the push rod 142 is fixedly connected to the output end of the driving component 3, and the other end of the push rod 142 movably passes through the positioning plate 6 and extends into the movable chamber 141. The piston plate 143 is fixedly connected to the other end of the push rod 142. The first one-way valve 144 is provided on the piston plate 143 and is used to connect the area above the piston plate and the area below the piston plate. During the process of the first spring 7 pushing the positioning plate to drive the measuring steel needle 5 to penetrate the soil layer to be tested, the piston plate 143 moves upward relative to the movable chamber 141, so that the gas in the area above the piston plate 143 of the movable chamber 141 enters the area below the piston plate 143 of the movable chamber 141 through the first one-way valve 144 to achieve gas storage. When the driving component 3 presses down the push rod 142 while the locking component 4 is in the locked state, the piston plate 143 compresses the gas in the area below the piston plate 143 of the active chamber 141, and the high-pressure gas pushes the soil sample out of the sampling slot 503.

[0028] For details, please refer to Figure 2 and Figure 5 As shown, in this embodiment, the measuring steel needle 5 includes a penetration section 501 and a shaft section 502. The sampling groove 503 is opened in the middle of the penetration section 501. The lower part of the penetration section 501 is provided with multiple inlets and outlets 504 that communicate with the sampling groove 503. During the process of the penetration section 501 penetrating the soil layer, the soil sample can enter the sampling groove 503 through the multiple inlets and outlets 504. This design can prevent the soil from falling out of the sampling groove 503 due to its own weight when the penetration section 501 is removed. The movable chamber 141 is located in the middle of the shaft section 502. An air inlet pipe 145 communicating with the movable chamber 141 is fixedly connected to the outside of the shaft section 502. A second one-way valve is installed on the air inlet pipe 145. When the push rod 142 is pressed down to make the piston plate 143 move down to compress the gas in the area below the piston plate 143, a negative pressure will be formed in the area above the piston plate 143. Therefore, outside air will enter the area above the movable chamber 141 through the air inlet pipe 145 to replenish the air for the next use. By adopting the above design, after the penetration section 501 penetrates into the soil layer, the first spring 7 and the push rod 142 are pulled up by the drive component 3. When the upward pulling force on the penetration section 501 is greater than the resistance of the soil layer, it will be driven to move upward by the positioning plate 6, thereby removing the penetration section 501 from the soil layer. The positioning plate 6 is locked by the locking component 4. Then, the first spring 7 can be pressed down by the drive component 3 to store force for the next test. At the same time, the push rod 142 is pressed down to push the piston plate 143. The piston plate 143 continuously compresses the gas in the area below the piston plate 143 in the active chamber 141. The high-pressure gas will push the soil sample in the sampling tank 503 to be discharged through multiple inlets and outlets 504.

[0029] The locking component 4 includes a storage box 403 and a stop 404. The storage box 403 is fixed to the protective cylinder 1, and the stop 404 is slidably connected inside the storage box 403. The sliding direction of the stop 404 is perpendicular to the compression direction of the first spring 7. The stop 404 extends from the storage box 403 to the bottom of the positioning plate 6 to lock the locking component 4. The stop 404 retracts into the storage box 403 to unlock the locking component.

[0030] Further, see Figure 2 As shown, there are two storage boxes 403 and two stop blocks 404 in the locking component 4, which are respectively set at the left and right ends of the protective cylinder 1 to ensure the stability of locking the positioning plate 6.

[0031] Among them, see Figure 3 As shown, the locking component 4 also includes a driving mechanism for driving the stop 404 to extend out of the storage box 403 or retract into the storage box 403.

[0032] The drive mechanism includes a second spring 405 and a pull rope 402. The second spring 405 is fixedly connected inside the storage box 403 and fixedly connected to the stop block 404. One end of the pull rope 402 is fixedly connected to the stop block 404, and the other end extends out of the storage box 403 to form an operating end. By pulling the pull rope 402 through the operating end, the stop block 404 is pulled to compress the second spring 405 and retract into the storage box 403. By releasing the pull rope 402, the compressed second spring 405 pushes the stop block 404 out of the storage box 403.

[0033] Further, see Figure 2 As shown, the protective cylinder 1 has grooves on both sides, and the grooves extend along the height direction of the protective cylinder 1. The inside of the groove is slidably connected to the lifting plate 401, and the other end of the lifting plate 401 is fixedly connected to the pull rope 402. The operator can hold the handle 10 and place the index finger on the lifting plate 401. By pulling the lifting plate 401 upward, the pull rope 402 can be driven to pull the stop block 404 into the storage box 403. The first spring 7 in the stored state can instantly push the positioning plate 6 and the measuring steel needle 5 to realize the soil strength detection. When the first spring 7 and the positioning plate 6 are pulled up by the driving component 3 and moved above the stop block 404, the lifting plate 401 can be released. The elastic second spring 405 can push the stop block 404 to move below the positioning plate 6, thereby blocking the positioning plate 6 from moving downward, so as to achieve locking.

[0034] Among them, see Figure 4 As shown, the shaft segment 502 is rotatably connected to the bottom of the positioning plate 6. The soil strength testing mechanism also includes a guide component, which is used to control the rotation of the measuring steel needle 5 when the measuring steel needle 5 is raised and lowered.

[0035] The guide component includes a guide rod 12, a spiral guide groove 13, and balls. The guide rod 12 is fixed to the inner wall of the protective cylinder 1, the spiral guide groove 13 is opened on the outside of the shaft section 502, and the balls are fixed on the guide rod 12 and can slide along the spiral guide groove 13.

[0036] By adopting the above design, when the first spring 7 pushes the measuring steel needle 5 downward in the stored state, the ball bearings slide along the spiral guide groove 13, which drives the entire measuring steel needle 5 to rotate. This allows the penetration section 501 to drill into the soil layer for testing, reducing the resistance of the penetration section 501 to the holes formed in the soil layer during drilling and extraction (the rotating measuring steel needle 5 penetrates the soil layer more easily than the traditional non-rotating measuring steel needle 5, so the instantaneous thrust of the first spring 7 in the stored state should be reduced in the design to avoid affecting the detection accuracy), making the testing work smoother.

[0037] Among them, see Figure 1-2As shown, the support mechanism 2 includes two legs 201 and two shafts 202. The two shafts 202 are fixedly connected to both sides of the protective cylinder 1, and the two legs 201 are rotatably sleeved on the two shafts 202. The support mechanism 2 also includes a fixing component for fixing the two legs 201 to the two shafts 202 respectively.

[0038] Furthermore, the fixing assembly includes two fixing sleeves 203, two bolts 204, and two screw holes. The two fixing sleeves 203 are respectively fixedly connected to the outside of the two support legs 201 and rotatably sleeved on the corresponding shafts 202. The two screw holes are respectively opened on the two fixing sleeves 203. The two bolts 204 are respectively inserted into the two screw holes and abut against the corresponding shafts 202, thereby fixing the support legs 201 and the shafts 202. By adopting the above design, the tilt angle of the protective cylinder 1 can be adjusted to better calibrate with the detection position and adapt to situations where the detection position is tilted or uneven.

[0039] The outer surface of the measuring steel needle 5 is marked with graduations.

[0040] By adopting the above design, the depth of penetration of the 501 penetration section into the soil layer can be directly observed through the scale, thus enabling operators to directly and better judge the strength of the soil layer reinforcement.

[0041] Further, see Figure 2 As shown, during the inspection, a transparent protective cover 11 can be installed on the outside of the penetration section 501 to prevent sand and gravel from splashing and causing danger during the drilling inspection.

[0042] Among them, see Figure 4 As shown, a connecting plate 8 is fixedly connected to the output end of the drive component 3, and the first spring 7 is connected to the output end of the drive component 3 through the connecting plate 8. The soil strength testing mechanism also includes a limiting rod 9 and a limiting hole. The limiting hole passes through the connecting plate 8. One end of the limiting rod 9 is fixedly connected to the positioning plate 6, and the other end passes through the limiting hole and extends to the top of the connecting plate 8.

[0043] Furthermore, there are multiple limiting rods 9 and multiple limiting holes, with multiple limiting rods 9 arranged circumferentially along the positioning plate 6 and multiple limiting holes arranged circumferentially along the connecting plate 8; By adopting the above design, the positioning plate 6 and the first spring 7 can be stably adjusted by using the cooperation of the limiting rod 9 and the limiting hole.

[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0045] The present invention has been described in detail above with reference to the accompanying drawings and embodiments. Those skilled in the art can make various modifications to the present invention based on the above description. Therefore, certain details in the embodiments should not be construed as limiting the present invention, and the scope of protection of the present invention shall be defined by the appended claims.

Claims

1. A soil strength testing mechanism suitable for foundation pit grouting reinforcement, characterized in that, include: Protective casing; A support mechanism, connected to the outside of the protective cylinder, is used to support the protective cylinder above the soil layer to be tested; A positioning plate is movably disposed inside the protective cylinder along the height direction of the protective cylinder, and a first spring is fixedly connected to the top of the positioning plate; The locking element has a locked state that prevents the positioning plate from moving downward relative to the protective cylinder and an unlocked state that allows the positioning plate to move downward relative to the protective cylinder; A driving component is fixed to the outside of the protective cylinder, and the output end of the driving component extends into the inside of the protective cylinder and is connected to the first spring. It is used to pull up or press down the first spring. When the locking component is in the locked state, the first spring can be compressed and stored. A measuring steel needle is fixedly connected to the bottom of a positioning plate, with a protective cylinder extending from the lower end of the needle. The locking mechanism switches from a spring-loaded state to an unlocked state, causing the positioning plate to be pushed downwards by the spring, thereby driving the measuring steel needle into the soil layer to be tested, thus achieving soil strength testing. The sampling slot, located at the lower end of the measuring needle, is used to allow soil samples to enter as the measuring needle penetrates the soil layer to be tested.

2. The soil strength testing mechanism for foundation pit grouting reinforcement as described in claim 1, characterized in that, It also includes a feeding mechanism for pushing soil samples out of the sampling trough.

3. The soil strength testing mechanism for foundation pit grouting reinforcement as described in claim 2, characterized in that, The feeding mechanism includes a push rod, a piston plate, a movable chamber, and a first one-way valve. The movable chamber is located at the upper end of the measuring steel needle and communicates with the sampling slot. One end of the push rod is fixedly connected to the output end of the driving component, and the other end of the push rod movably passes through the positioning plate and extends into the movable chamber. The piston plate is fixedly connected to the other end of the push rod. The first one-way valve is disposed on the piston plate and is used to connect the area above and the area below the piston plate. During the process of the first spring pushing the positioning plate to drive the measuring steel needle to penetrate the soil layer to be tested, the piston plate moves upward relative to the movable chamber, so that the gas in the area above the piston plate of the movable chamber enters the area below the piston plate of the movable chamber through the first one-way valve to achieve gas storage. When the locking member is locked, the drive unit presses down the push rod, causing the piston plate to compress the gas in the area below the piston plate in the active chamber, and the high-pressure gas pushes the soil sample out of the sampling slot.

4. The soil strength testing mechanism for foundation pit grouting reinforcement as described in claim 1, characterized in that, The locking component includes a storage box and a stop block. The storage box is fixed to the protective cylinder, and the stop block is slidably connected inside the storage box. The sliding direction of the stop block is perpendicular to the compression direction of the first spring. The stop block extends out of the storage box to the bottom of the positioning plate to lock the locking component. The stop block retracts into the storage box to unlock the locking component.

5. The soil strength testing mechanism for foundation pit grouting reinforcement as described in claim 4, characterized in that, The locking component also includes a drive mechanism for driving the stop block to extend out of or retract into the storage box.

6. The soil strength testing mechanism for foundation pit grouting reinforcement as described in claim 5, characterized in that, The drive mechanism includes a second spring and a pull rope. The second spring is fixedly connected inside the storage box and fixedly connected to the stop block. One end of the pull rope is fixedly connected to the stop block, and the other end extends out of the storage box to form an operating end. By pulling the pull rope through the operating end, the stop block is pulled to compress the second spring and retract into the storage box. By releasing the pull rope, the compressed second spring pushes the stop block out of the storage box.

7. The soil strength testing mechanism for foundation pit grouting reinforcement as described in claim 1, characterized in that, The measuring steel needle is rotatably connected to the bottom of the positioning plate. The soil strength testing mechanism also includes a guide for controlling the rotation of the measuring steel needle when it is raised or lowered.

8. The soil strength testing mechanism for foundation pit grouting reinforcement as described in claim 7, characterized in that, The guide component includes a guide rod, a spiral guide groove, and a ball bearing. The guide rod is fixed to the inner wall of the protective cylinder, the spiral guide groove is formed on the outside of the measuring steel needle, and the ball bearing is fixed to the guide rod and can slide along the spiral guide groove.

9. The soil strength testing mechanism for foundation pit grouting reinforcement as described in claim 1, characterized in that, The support mechanism includes two legs and two shafts. The two shafts are fixedly connected to both sides of the protective cylinder, and the two legs are rotatably sleeved on the two shafts. The support mechanism also includes a fixing component for fixing the two legs to the two shafts respectively.

10. The soil strength testing mechanism for foundation pit grouting reinforcement as described in claim 1, characterized in that, The outer surface of the measuring steel needle is provided with graduations.

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