An earth pressure box

Abstract

The present invention relates to the technical field of soil pressure detection, and specifically to a soil pressure box, comprising a box body, an annular disc frame installed on the box body, a connecting disc frame being arranged on the box body, an additional disc frame being arranged on one side of the connecting disc frame, a clockwork timer being installed on the outer wall of one side of the additional disc frame, a driving shaft body being installed at the output end of the clockwork timer, an intermittent gear being installed on the driving shaft body, a screw rod being installed on the additional disc frame, a driven gear being installed at the end of the screw rod, a driving frame body being installed on the screw rod, and a connecting rod frame being installed on the driving frame body. This soil pressure box uses the screw rod and the driving frame body to drive the box body to move in a direction away from the surface of the soil layer, at which time the pressure membrane of the box body will not contact the surface of the soil layer, and under the action of the clockwork timer, the box body moves to a position in contact with the surface of the soil layer within a specified time, and through the structural design of the present invention, it is effectively avoided that the pressure membrane of the box body will not contact with the soil layer or touch hard objects during the process of the box body being inserted into the soil layer along with the steel sheet pile.

Description

Technical Field

[0001] This invention relates to the field of soil pressure detection technology, specifically to a soil pressure cell. Background Art

[0002] An earth pressure cell, also known as an earth pressure sensor, is an embedded general-purpose stress sensor primarily used to measure and test the internal stress of soil under complex conditions. It is particularly suitable for long-term and automated monitoring of soil structures to fully understand the pressure state at the measured point. Typical applications of earth pressure cells include earth pressure testing in special industries such as road foundations, highway / railway slope protection, mining, and dam structures, as well as in engineering projects such as roadbeds, anti-slide piles, retaining walls, and tunnels. The main testing principle of an earth pressure cell is to collect data at different times using a BP vibrating wire frequency reader, record the sensor's frequency value, instrument number, design number, and measurement time, and then use relevant formulas to calculate the specific value of the earth pressure.

[0003] When monitoring soil pressure at the insertion point of sheet piles is required, existing technologies often use the insertion method to fix the earth pressure cell inside the sheet pile. When using the insertion method, a hole is first pre-drilled in the sheet pile, and then the earth pressure cell is embedded in the sheet pile, ensuring the pressure membrane of the cell is flush with the surface of the soil to be measured. A rigid support is then installed on the other side of the pressure cell, fixedly connected to the inner wall of the pre-drilled hole to ensure the pressure cell does not shift under soil pressure, thus guaranteeing measurement reliability. The earth pressure cell is then driven into the soil along with the sheet pile. However, during this insertion process, the pressure membrane on one side of the cell comes into contact with the soil, causing wear. Compared to pressure cells fixed using other methods (such as the hanging method or the jacking method), this type of installation results in a shorter service life. Furthermore, if hard objects are present in the soil during insertion, they can easily damage the surface of the pressure membrane, affecting the normal use of the pressure cell. Therefore, we propose an earth pressure cell. Summary of the Invention

[0004] The purpose of this invention is to provide an earth pressure cell to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an earth pressure box, comprising a box body, an annular disc frame fixedly mounted on the box body, a connecting disc frame also provided on the box body, multiple guide shafts fixedly mounted on the connecting disc frame, multiple fixed seats fixedly mounted on the annular disc frame, the fixed seats slidingly passing through the guide shafts one by one, an additional disc frame provided on one side of the connecting disc frame, multiple extension frames fixedly mounted on the outer wall of the connecting disc frame, the extension frames being connected to the additional disc frame by bolts, a spring-loaded timer fixedly mounted on the additional disc frame, a drive shaft fixedly mounted at the output end of the spring-loaded timer, the end of the drive shaft passing through to the other side of the additional disc frame and connected to an intermittent gear, a lead screw rotatably mounted on the additional disc frame, a driven gear fixedly mounted on the lead screw, the driven gear meshing with the intermittent gear, a drive frame mounted on the lead screw, multiple connecting rod frames fixedly mounted on the drive frame, the ends of the connecting rod frames slidingly passing through the guide shafts, and the drive frame being connected to the box body by bolts.

[0006] Preferably, a silicone membrane is mounted on the annular disc rack, and an opening is provided on the silicone membrane. The opening is located at the lowest point of the silicone membrane, and the annular edge on one side of the silicone membrane is curved and bends toward the central axis of the box body.

[0007] Preferably, multiple limiting sleeves are fixedly installed on the annular disc frame, and a sliding plate frame is installed on the inner wall of the limiting sleeve. The sliding plate frame slides within the limiting sleeve. An extension shaft is fixedly installed on the sliding plate frame. The end of the extension shaft extends through the limiting sleeve. The extension shaft and the limiting sleeve are coaxially arranged. One end of the extension shaft located outside the limiting sleeve is fixedly connected to an annular pressure plate. The annular pressure plate is located on the inner wall of the silicone membrane.

[0008] Preferably, a magnetic shaft is fixedly installed on the sliding plate frame, a straight groove is opened on the inner wall of the limiting sleeve, and an arc-shaped groove is connected to the straight groove. The magnetic shaft slides within the straight groove and the arc-shaped groove. A magnet is installed on the inner wall of the arc-shaped groove away from the straight groove. The magnet generates an attractive force with the magnetic shaft that moves into the arc-shaped groove. A return spring is abutted between the end of the sliding plate frame inside the limiting sleeve and the bottom of the limiting sleeve.

[0009] Preferably, a waterproof membrane is installed on one side of the box body, and the waterproof membrane is curved outward.

[0010] Preferably, the annular pressure plate corresponds to the curved area of ​​the silicone membrane.

[0011] Preferably, an additional sleeve is fixedly installed on both sides of the fixed seat body, a circular panel is slidably connected to the inner wall of the additional sleeve, a compression spring is connected between the circular panel and the inner wall of the additional sleeve, and a clamping shaft is fixedly installed on the side of the circular panel away from the compression spring, and the end of the clamping shaft passes through the outside of the additional sleeve.

[0012] Preferably, an additional mounting plate is fixedly installed on both sides of the extension frame. The additional mounting plate has through holes located on the movement trajectory of the snap-fit ​​shaft. A snap-fit ​​sleeve is fixedly installed on the outer wall of the additional mounting plate. An action shaft is installed inside the snap-fit ​​sleeve. One end of the action shaft is located in the through hole, and the other end of the action shaft passes through and extends to the outside of the snap-fit ​​sleeve.

[0013] Preferably, a circular plate frame is rotatably sleeved on the actuating shaft, the circular plate frame slides within the locking sleeve, and a working spring connects the circular plate frame and the inner wall of the locking sleeve.

[0014] Preferably, a sliding shaft is fixedly installed on the actuating shaft, and an L-shaped groove is provided on the inner wall of the snap-fit ​​sleeve, so that the sliding shaft can slide within the L-shaped groove.

[0015] The beneficial effects of the present invention are:

[0016] This invention utilizes a lead screw and a drive frame to move the housing away from the soil surface, preventing the pressure membrane of the housing from contacting the soil surface. Under the action of a clockwork timer, the housing moves to the position of contact with the soil surface within a set time. The self-locking property of the lead screw effectively ensures that the housing is in a fixed state. At the same time, the intermittent gears prevent the housing from moving towards the soil surface during the insertion of the sheet pile into the ground, effectively avoiding wear caused by the pressure membrane of the housing coming into contact with hard objects in the soil during the insertion of the sheet pile. Attached Figure Description

[0017] Figure 1 It is a schematic structural diagram of the present invention as a whole;

[0018] Figure 2 This is a partial structural diagram of the extension frame in this invention;

[0019] Figure 3 This is a schematic diagram showing the structural separation of the box body and the connecting tray frame in this invention;

[0020] Figure 4 This is a schematic diagram showing the separation of the connecting tray and the added tray structure in this invention;

[0021] Figure 5 This is a schematic diagram showing the separation of the drive frame and the added disc frame in this invention;

[0022] Figure 6 This is a schematic diagram of one side of the annular disc frame in this invention;

[0023] Figure 7 Schematic diagram of the structure of the silica gel membrane in the present invention;

[0024] Figure 8 This is a schematic diagram of the internal structure of the limiting sleeve in this invention;

[0025] Figure 9 This is a schematic diagram of the internal structure of the sleeve added in this invention;

[0026] Figure 10 This is a schematic diagram of the internal structure and through hole of the snap-fit ​​sleeve in this invention;

[0027] Figure 11 This is a schematic diagram showing the separation of the snap-fit ​​sleeve and the working shaft in this invention.

[0028] In the diagram: 1. Box body; 101. Waterproof membrane; 2. Annular disc frame; 21. Fixed base; 22. Silicone membrane; 221. Opening; 23. Limiting sleeve; 231. Straight groove; 232. Arc groove; 233. Magnet block; 24. Sliding plate frame; 241. Extension shaft; 242. Annular pressure plate; 243. Magnetic shaft; 25. Return spring; 26. Adding sleeve; 261. Circular panel; 262. Compression spring; 263. Snap-fit ​​shaft 3. Connecting disc frame; 31. Guide shaft; 32. Extension frame; 33. Mounting plate frame; 331. Through hole; 34. Snap-fit ​​sleeve; 341. Actuating shaft; 342. Circular plate frame; 343. Working spring; 344. Sliding shaft; 345. L-shaped groove; 4. Mounting disc frame; 41. Clockwork timer; 42. Drive shaft; 43. Intermittent gear; 44. Lead screw; 45. Driven gear; 46. Drive frame; 47. Connecting rod frame. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] Please see Figure 1-11This invention provides a technical solution: an earth pressure box, comprising a box body 1, an annular disc frame 2 fixedly mounted on the box body 1, a connecting disc frame 3 also provided on the box body 1, a plurality of guide shafts 31 fixedly mounted on the connecting disc frame 3, a plurality of fixing seats 21 fixedly mounted on the annular disc frame 2, the fixing seats 21 being slidably inserted through the guide shafts 31 one-to-one, an additional disc frame 4 provided on one side of the connecting disc frame 3, a plurality of extension frames 32 fixedly mounted on the outer wall of the connecting disc frame 3, the extension frames 32 being connected to the additional disc frame 4 by bolts, and a spring-loaded timer 41 fixedly mounted on the additional disc frame 4. A drive shaft 42 is fixedly installed at the output end of the clockwork timer 41. The end of the drive shaft 42 extends through to the other side of the mounting plate 4 and is connected to the intermittent gear 43. A lead screw 44 is rotatably installed on the mounting plate 4. A driven gear 45 is fixedly installed on the lead screw 44. The driven gear 45 meshes with the intermittent gear 43. A drive frame 46 is installed on the lead screw 44. Multiple connecting rods 47 are fixedly installed on the drive frame 46. The ends of the connecting rods 47 slide through the guide shaft 31. The drive frame 46 is connected to the housing 1 by bolts. The connecting rods 47 are located on one side of the fixed base 21.

[0031] Combined with attachment Figure 1-5 As shown, when installing the above components, the annular disc frame 2 is first fixedly installed on the box 1. Then, the guide shaft 31 on the connecting disc frame 3 passes through the fixed base 21. At this time, the box 1 and the annular disc frame 2 are restricted on the guide shaft 31. Then, the threaded hole on the mounting disc frame 4 and the threaded hole on the extension frame 32 are aligned, and the mounting disc frame 4 and the extension frame 32 are connected with bolts. The guide shaft 31 passes through the mounting disc frame 4 and is fixedly connected to the mounting disc frame 4 with a nut. The connecting disc frame 3, the extension frame 32 and the mounting disc frame 4 are fixed to the inner wall of the reserved hole of the steel sheet pile with bolts.

[0032] Following the above, before the sheet pile is inserted into the soil, the clockwork timer 41 is rotated. The output of the clockwork timer 41 drives the shaft 42, which in turn drives the driven gear 45 through the intermittent gear 43. The driven gear 45 drives the lead screw 44 to rotate, and the connecting rod frame 47 slides at the upper limit of the guide shaft 31. When the lead screw 44 rotates, the drive frame 46 moves synchronously and linearly with the connecting rod frame 47. The drive frame 46 is fixedly connected to the housing 1 by bolts, thereby driving the housing 1 to move synchronously, causing the housing 1 to move away from the soil surface. At this time, the pressure membrane of the housing 1 will not contact the soil surface. It should be noted that the time set by the clockwork timer 41 must be greater than the insertion time of the sheet pile, preferably about three times the insertion time. During the process of the sheet pile being inserted into the soil, the clockwork timer 41, in conjunction with the attached... Figure 5As shown, when the output end of the clockwork timer 41 drives the driving shaft 42 to start reverse movement, the teeth on the intermittent gear 43 will not engage with the driven gear 45, and the driven gear 45 is stationary. When the steel sheet pile is inserted into the specified position, the intermittent gear 43 engages with the driven gear 45 and rotates, and the driving frame 46 on the screw rod 44 moves in the opposite direction, causing the box body 1 to move toward the soil layer, so that the pressure membrane of the box body 1 contacts the surface of the soil layer through the reserved cavity. Since the screw rod 44 has a self-locking property, the box body 1 is in a fixed state.

[0033] Both sides of the fixed seat body 21 are fixedly installed with an additional sleeve 26, a circular panel 261 is slidably connected to the inner wall of the additional sleeve 26, a compression spring 262 is connected between the circular panel 261 and the inner wall of the additional sleeve 26, and a clamping shaft 263 is fixedly installed on the side of the circular panel 261 away from the compression spring 262, and the end of the clamping shaft 263 passes through the outside of the additional sleeve 26; the two sides of the extension frame 32 are fixedly installed with an additional plate frame 33, and a through hole 331 is opened on the additional plate frame 33. The through hole 331 is located on the movement trajectory of the clamping shaft 263, and a clamping sleeve is fixedly installed on the outer wall of the additional plate frame 33 The cylinder 34, an operating shaft 341 is installed inside the clamping sleeve 34, one end of the operating shaft 341 is located in the through hole 331, and the other end of the operating shaft 341 passes through and extends to the outside of the clamping sleeve 34; a circular plate frame 342 is rotatably sleeved on the operating shaft 341, and the circular plate frame 342 slides within the clamping sleeve 34, and a working spring 343 is connected between the circular plate frame 342 and the inner wall of the clamping sleeve 34; a sliding shaft 344 is fixedly installed on the operating shaft 341, and an L-shaped groove 345 is opened on the inner wall of the clamping sleeve 34, and the sliding shaft 344 slides within the L-shaped groove 345.

[0034] Combined with attachment Figure 4 、 9As shown in FIG-11, before the steel sheet pile is inserted into the soil layer, the end of the clamping shaft 263 is in contact with the outer wall of the extension frame 32, and the compression spring 262 is in a compressed state. When the box body 1 moves toward the soil layer, the clamping shaft 263 also moves toward the through hole 331 accordingly. When the pressure membrane of the box body 1 contacts the surface of the soil layer, the clamping shaft 263 moves to the through hole 331. At this time, the compression spring 262 exerts a force on the circular panel 261, so that the circular panel 261 drives the clamping shaft 263 to move. The clamping shaft 263 moves into the through hole 331 and passes through the through hole 33 The first clamping shaft 263 is limited in position, thereby fixing the fixed seat body 21, the annular disc rack 2 and the box body 1, thereby increasing the fixing strength; when the box body 1 needs to be taken out for maintenance, the fixation is released, and the end of the working shaft 341 located on the outside is pushed, so that the other end of the working shaft 341 applies a force to the end of the clamping shaft 263, so that the clamping shaft 263 moves toward the inside of the clamping sleeve 34, and the circular panel 261 on the clamping shaft 263 compresses the compression spring 262. In this process, the sliding shaft 344 on the working shaft 341 moves along the track of the L-shaped groove 345; combined with the attached Figure 11 As shown, when the end of the clamping shaft 263 leaves the through hole 331, the sliding shaft 344 moves to the bottom of the L-shaped groove 345. In this state, the acting shaft 341 cannot be pushed and can only rotate. Since multiple fixed seat bodies 21 are installed on the annular disc rack 2, each fixed seat body 21 has two clamping shafts 263. When the sliding shaft 344 moves to the bottom of the L-shaped groove 345, the acting shaft 341 is rotated to make the sliding shaft 344 move to one end of the L-shaped groove 345, so that the acting shaft 341 is fixed in this state to prevent the clamping shaft 263 that has left the through hole 331 from returning to the through hole 331.

[0035] During soil pressure monitoring, groundwater seepage exists within the soil layer. To prevent the pressure membrane of box 1 from contacting water and causing errors in the monitoring data, the present invention incorporates the following design: A silicone membrane 22 is mounted on the annular disc frame 2. An opening 221 is provided on the silicone membrane 22, located at the lowest point of the membrane. One side of the annular edge of the silicone membrane 22 is curved towards the central axis of box 1. Multiple limiting sleeves 23 are fixedly mounted on the annular disc frame 2. A sliding plate frame 24 is installed on the inner wall of the limiting sleeve 23. The sliding plate frame 24 slides within the limiting sleeve 23, providing a limiting effect. An extension shaft 241 is fixedly installed on the upper part of the box 1. The end of the extension shaft 241 extends through the limiting sleeve 23. The extension shaft 241 and the limiting sleeve 23 are coaxially arranged. One end of the extension shaft 241 located outside the limiting sleeve 23 is fixedly connected to an annular pressure plate 242, which is located on the inner wall of the silicone membrane 22. It should be noted that when the pressure membrane of the box 1 is not in contact with the soil surface, the ends of the silicone membrane 22 and the annular pressure plate 242 are both located on one side of the pressure membrane of the box 1. That is, when the box 1 moves towards the soil, the silicone membrane 22 first contacts the soil, then the annular pressure plate 242 contacts the soil through the silicone membrane 22, and finally the pressure membrane of the box 1 contacts the soil. The bending area of ​​the annular pressure plate 242 corresponds to that of the silicone membrane 22 (see attached diagram for details). Figure 6 A magnetic shaft 243 is fixedly installed on the sliding plate frame 24. A straight groove 231 and an arc-shaped groove 232 communicating with the straight groove 231 are formed on the inner wall of the limiting sleeve 23. The magnetic shaft 243 slides within the straight groove 231 and the arc-shaped groove 232. A magnet 233 is installed on the inner wall of the arc-shaped groove 232 away from the straight groove 231. The magnet 233 generates an attractive force with the magnetic shaft 243 that moves into the arc-shaped groove 232. A return spring 25 is abutted between one end of the limiting sleeve 23 and the bottom of the limiting sleeve 23; a waterproof membrane 101 is installed on one side of the box body 1, and the waterproof membrane 101 is curved outward. The waterproof membrane 101 is used to block water approaching the box body 1, while the silicone membrane 22 is used to block water from top to bottom; when there is a lot of soil moisture, the waterproof membrane 101 effectively blocks water approaching the box body 1, and the waterproof membrane 101 and the silicone membrane 22 achieve the effect of blocking water.

[0036] Specifically, when the box 1 moves toward the soil surface, the silicone membrane 22 first contacts the soil. The silicone membrane 22 continues to bend under the pressure of the soil. As the end of the silicone membrane 22 bends toward the centerline of the box 1, the bending of the silicone membrane 22, which continues to bend under the force of the soil, increases. Subsequently, the annular pressure plate 242 contacts the soil through the silicone membrane 22 and is subjected to the force of the soil, thereby extending the shaft 241 to drive the sliding plate frame 24 toward the interior of the limiting sleeve 23. During this process, the magnetic shaft 243 on the sliding plate frame 24 moves along the straight groove. 231 Movement: When the magnetic shaft 243 moves to the arc-shaped groove 232, the pressure membrane side of the box 1 contacts the soil layer, and the magnetic shaft 243 enters the arc-shaped groove 232 under the action of the magnet block 233. Then the sliding plate frame 24 is limited in this state. Under the action of the extension shaft 241, the annular pressure plate 242 always acts on the silicone membrane 22, which plays a role in sealing the silicone membrane 22. The opening 221 at the bottom of the silicone membrane 22 is used to drain the water between the silicone membrane 22 and the waterproof membrane 101 to avoid the accumulation of water.

[0037] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0038] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An earth pressure cell, characterized in that: The invention comprises a box body (1), an annular disc frame (2) is fixedly mounted on the box body (1), a connecting disc frame (3) is also arranged on the box body (1), a plurality of guide shaft bodies (31) are fixedly mounted on the connecting disc frame (3), a plurality of fixed seat bodies (21) are fixedly mounted on the annular disc frame (2), the fixed seat bodies (21) are slidably arranged on the guide shaft bodies (31) in a one-to-one correspondence, an additional disc frame (4) is arranged on one side of the connecting disc frame (3), a plurality of extension frames (32) are fixedly mounted on the outer wall of the connecting disc frame (3), the extension frames (32) and the additional disc frame (4) are connected by bolts, a clockwork timer (41) is fixedly mounted on the additional disc frame (4), and the timer (41) is fixedly mounted on the additional disc frame (4). A driving shaft (42) is fixedly mounted on the output end of the timer (41), and the end of the driving shaft (42) passes through the other side of the mounting disc frame (4) and is connected to the intermittent gear (43). A screw rod (44) is rotatably mounted on the mounting disc frame (4), and a driven gear (45) is fixedly mounted on the screw rod (44). The driven gear (45) is meshedly connected with the intermittent gear (43). A driving frame (46) is mounted on the screw rod (44), and a plurality of connecting rod frames (47) are fixedly mounted on the driving frame (46). The ends of the connecting rod frames (47) are slidably mounted on the guide shaft (31), and the driving frame (46) is connected to the box body (1) by bolts.

2. An earth pressure cell according to claim 1, characterized in that: A silicone film (22) is mounted on the annular disc frame (2). An opening (221) is formed on the silicone film (22). The opening (221) is located at the lowest point of the silicone film (22). The annular edge on one side of the silicone film (22) is curved and curved towards the central axis of the box body (1).

3. An earth pressure cell according to claim 2, characterized in that: A plurality of limiting sleeves (23) are fixedly mounted on the annular disc frame (2), a sliding plate frame (24) is mounted on the inner wall of the limiting sleeve (23), the sliding plate frame (24) slides within the limiting sleeve (23), an extension shaft (241) is fixedly mounted on the sliding plate frame (24), the end of the extension shaft (241) passes through the limiting sleeve (23), the extension shaft (241) and the limiting sleeve (23) are coaxially arranged, one end of the extension shaft (241) located outside the limiting sleeve (23) is fixedly connected to an annular pressure plate (242), and the annular pressure plate (242) is arranged on the inner wall of the silicone film (22).

4. An earth pressure cell according to claim 3, characterized in that: A magnetic shaft (243) is fixedly mounted on the sliding plate frame (24); a straight groove (231) and an arc groove (232) connected to the straight groove (231) are formed on the inner wall of the limiting sleeve (23); the magnetic shaft (243) slides in the straight groove (231) and the arc groove (232) in a limited manner; a magnet block (233) is mounted on the inner wall of one end of the arc groove (232) away from the straight groove (231); the magnet block (233) generates suction force with the magnetic shaft (243) moving into the arc groove (232); and a return spring (25) is connected between one end of the sliding plate frame (24) in the limiting sleeve (23) and the bottom of the limiting sleeve (23).

5. The earth pressure cell according to claim 4, characterized in that: A waterproof membrane (101) is installed on one side of the box body (1), and the waterproof membrane (101) is in an outwardly curved shape.

6. The earth pressure cell according to claim 4, characterized in that: The annular pressing plate (242) corresponds to the bending area of ​​the silicone membrane (22).

7. The earth pressure cell according to claim 1, characterized in that: An additional sleeve (26) is fixedly mounted on both sides of the fixed seat body (21); a circular panel (261) is slidably connected to the inner wall of the additional sleeve (26); a compression spring (262) is connected between the circular panel (261) and the inner wall of the additional sleeve (26); a clamping shaft (263) is fixedly mounted on one side of the circular panel (261) away from the compression spring (262); and an end of the clamping shaft (263) passes through the outside of the additional sleeve (26).

8. An earth pressure cell according to claim 7, characterized in that: An additional plate frame (33) is fixedly mounted on both sides of the extension frame (32), a through hole (331) is opened on the additional plate frame (33), and the through hole (331) is located on the movement track of the clamping shaft body (263). A clamping sleeve (34) is fixedly mounted on the outer wall of the additional plate frame (33), and an active shaft body (341) is mounted inside the clamping sleeve (34), one end of the active shaft body (341) is located in the through hole (331), and the other end of the active shaft body (341) passes through and extends to the outside of the clamping sleeve (34).

9. An earth pressure cell according to claim 8, characterized in that: A circular plate frame (342) is rotatably sleeved on the action shaft (341), the circular plate frame (342) slides within the clamping sleeve (34) in a limited position, and a working spring (343) is connected between the circular plate frame (342) and the inner wall of the clamping sleeve (34).

10. An earth pressure cell according to claim 9, characterized in that: A sliding shaft body (344) is fixedly mounted on the action shaft body (341), an L-shaped groove body (345) is provided on the inner wall of the clamping sleeve (34), and the sliding shaft body (344) slides in a limited position in the L-shaped groove body (345).

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