Earth pressure box

Abstract

The invention relates to the technical field of soil pressure detection, in particular to a soil pressure box which comprises a box body, an annular plate frame installed on the box body, a connecting plate frame arranged on the box body, an additionally-installed plate frame arranged on one side of the connecting plate frame, a spring timer installed on the outer wall of one side of the additionally-installed plate frame, and a driving shaft body installed at the output end of the spring timer. A driving shaft body is installed on the box body, an intermittent gear is installed on the driving shaft body, a lead screw is installed on the additionally-installed disc frame, a driven gear is installed at the end of the lead screw, a driving frame body is installed on the lead screw, and a connecting rod frame is installed on the driving frame body. At the moment, the pressure film of the box body does not make contact with the surface of the soil layer, under the action of the spring timer, the box body moves to the position making contact with the surface of the soil layer within the set time, and through the structural design, the situation that the pressure film makes contact with the soil layer or makes contact with hard objects in the process that the box body is inserted into the soil layer along with the steel sheet pile is effectively avoided.

Description

Technical Field

[0001] The invention relates to the technical field of soil pressure detection, in particular to a soil pressure box. Background Art

[0002] Earth pressure cell, also known as earth pressure sensor, is an embedded general stress sensor, which is mainly used to measure and test the stress inside the soil under complex conditions. It is particularly suitable for long-term and automated monitoring of soil structures in order to fully understand the pressure state of the measured point. Typical applications of earth pressure cells include road foundations, highway / railway slope protection, mines, dam structures and other special industries' roadbeds, anti-slide piles, retaining walls, tunnels and other projects. The main testing principle of the earth pressure cell is to collect data from different periods through a BP vibrating string frequency reader, record the frequency value of the sensor, instrument number, design number and measurement time, and then use the relevant formulas for calculation to obtain the specific value of the earth pressure.

[0003] When it is necessary to monitor the soil pressure at the insertion point of the steel sheet pile, the existing technology often uses the insertion method to fix the earth pressure box in the steel sheet pile. When the earth pressure box is fixed using the insertion method, a hole is first reserved on the steel sheet pile, and then the earth pressure box is embedded in the sheet pile so that the pressure membrane of the box body is flush with the structural surface of the earth pressure to be measured. Then, a bracket with good rigidity is installed on the other side of the pressure box. The bracket is fixedly connected to the inner wall of the reserved hole to ensure that the pressure box will not produce any displacement under the action of the earth pressure to ensure the reliability of the measurement. Then, the earth pressure box is driven into the soil layer with the steel sheet pile. However, in the process of inserting the steel sheet pile into the soil layer, the pressure membrane on one side of the pressure box contacts the soil layer, causing wear to the pressure membrane. Compared with the pressure box fixed by other methods (such as the hanging cloth method, the jacking method, etc.), the working life of the pressure box installed in this way is shorter, and in the process of inserting with the sheet pile, if there are hard objects in the soil layer, it is easy to cause damage to the surface of the pressure membrane, affecting the normal use of the pressure box. For this reason, we propose an earth pressure box. Summary of the invention

[0004] The object of the present invention is to provide an earth pressure cell to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a soil pressure box, comprising a box body, a ring-shaped disc frame is fixedly installed on the box body, and a connecting disc frame is also provided on the box body, a plurality of guide shaft bodies are fixedly installed on the connecting disc frame, a plurality of fixed seat bodies are fixedly installed on the ring-shaped disc frame, and the fixed seat bodies are slidably penetrated on the guide shaft bodies one by one, an additional disc frame is provided on one side of the connecting disc frame, a plurality of extension frames are fixedly installed on the outer wall of the connecting disc frame, the extension frames and the additional disc frame are connected by bolts, a clockwork timer is fixedly installed on the additional disc frame, a driving shaft body is fixedly installed on the output end of the clockwork timer, the end of the driving shaft body passes through the other side of the additional disc frame and is connected with the intermittent gear, a screw rod is rotatably installed on the additional disc frame, a driven gear is fixedly installed on the screw rod, the driven gear is meshed with the intermittent gear, a driving frame is installed on the screw rod, a plurality of connecting rod frames are fixedly installed on the driving frame, the ends of the connecting rod frames are slidably penetrated on the guide shaft body, and the driving frame body is connected to the box body by bolts.

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

[0007] Preferably, a plurality of limiting sleeves are fixedly mounted on the annular disc rack, a sliding plate rack is mounted on the inner wall of the limiting sleeve, the sliding plate rack slides within the limiting sleeve, an extension shaft body is fixedly mounted on the sliding plate rack, the end of the extension shaft body passes through the limiting sleeve, the extension shaft body is coaxially arranged with the limiting sleeve, one end of the extension shaft body located outside the limiting sleeve is fixedly connected to the annular pressure plate, and the annular pressure plate is arranged on the inner wall of the silicone membrane.

[0008] Preferably, a magnetic shaft is fixedly mounted on the sliding plate frame, a straight groove and an arcuate groove connected to the straight groove are formed on the inner wall of the limiting sleeve, the magnetic shaft slides within the straight groove and the arcuate groove, a magnet block is mounted on the inner wall of one end of the arcuate groove away from the straight groove, the magnet block generates suction with the magnetic shaft moving into the arcuate groove, and a return spring is connected between one end of the sliding plate frame in 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 outwards.

[0010] Preferably, the annular pressing plate corresponds to the bending 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 body is fixedly installed on the side of the circular panel away from the compression spring, and the end of the clamping shaft body passes through the outside of the additional sleeve.

[0012] Preferably, additional plate frames are fixedly installed on both sides of the extension frame, and through holes are opened on the additional plate frames, which are located on the movement trajectory of the clamping shaft. A clamping sleeve is fixedly installed on the outer wall of the additional plate frame, and an active shaft body is installed inside the clamping sleeve. One end of the active shaft body is located in the through hole, and the other end of the active shaft body passes through and extends to the outside of the clamping sleeve.

[0013] Preferably, a circular plate frame is rotatably sleeved on the action shaft, the circular plate frame slides within the clamping sleeve in a limited position, and a working spring is connected between the circular plate frame and the inner wall of the clamping sleeve.

[0014] Preferably, a sliding shaft body is fixedly mounted on the action shaft body, an L-shaped groove body is provided on the inner wall of the clamping sleeve, and the sliding shaft body slides within a limited position in the L-shaped groove body.

[0015] The beneficial effects of the present invention are: The present invention utilizes a screw rod and a driving frame to drive the box body to move away from the surface of the soil layer, so that the pressure membrane of the box body will not contact the surface of the soil layer, and under the action of a clockwork timer, the box body moves to a position in contact with the surface of the soil layer within a set time. The self-locking property of the screw rod effectively ensures that the box body is in a fixed state, and at the same time, intermittent gears are utilized to prevent the box body from moving toward the surface of the soil layer during the process of inserting the steel sheet pile into the ground, effectively preventing the pressure membrane of the box body from contacting hard objects in the soil layer and causing wear during the process of inserting the steel sheet pile into the soil layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a structural schematic diagram of a part of the extension frame in the present invention; Figure 3 It is a schematic diagram of the structural separation of the box body and the connecting disc frame in the present invention; Figure 4 It is a schematic diagram of the structural separation of the connecting disk rack and the additional disk rack in the present invention; Figure 5 It is a schematic diagram of the structural separation of the driving frame and the additional disk rack in the present invention; Figure 6 It is a structural schematic diagram of one side of the annular disc rack in the present invention; Figure 7 Schematic diagram of the structure of the silica gel membrane in the present invention; Figure 8 It is a schematic diagram of the structure inside the limiting sleeve in the present invention; Fig. 9 It is a schematic diagram of the structure inside the additional sleeve in the present invention; Fig.10 It is a schematic diagram of the structure of the interior of the clamping sleeve and the through hole in the present invention; Fig.11It is a schematic diagram of the structural separation of the clamping sleeve and the active shaft body in the present invention.

[0017] In the figure: 1, box body; 101, waterproof film; 2, annular disc frame; 21, fixed seat body; 22, silicone film; 221, opening; 23, limit sleeve; 231, straight groove body; 232, arc groove body; 233, magnet block; 24, sliding plate frame; 241, extension shaft body; 242, annular pressure plate; 243, magnetic shaft body; 25, reset spring; 26, additional sleeve; 261, circular panel; 262, compression spring; 263, clamping shaft body; 3, connecting disc frame; 31, guide shaft body; 32, extension frame body; 33, additional plate frame; 331, through hole; 34, snap-on sleeve; 341, working shaft body; 342, circular plate frame; 343, working spring; 344, sliding shaft body; 345, L-shaped groove body; 4, additional disc frame; 41, spring timer; 42, driving shaft body; 43, intermittent gear; 44, screw rod; 45, driven gear; 46, driving frame body; 47, connecting rod frame. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0019] See also Figure 1-11 The present invention provides a technical solution: an earth pressure box, comprising a box body 1, a ring-shaped disc frame 2 is fixedly mounted on the box body 1, a connecting disc frame 3 is also provided 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 ring-shaped disc frame 2, the fixed seat bodies 21 are slidably penetrated on the guide shaft bodies 31 in a one-to-one correspondence, an additional disc frame 4 is provided 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 are connected to the additional disc frame 4 by bolts, and a clockwork timer 41 is fixedly mounted on the additional disc frame 4, A driving shaft 42 is fixedly installed at the output end of the clockwork timer 41, and the end of the driving shaft 42 passes through the other side of the additional disc frame 4 and is connected to the intermittent gear 43. A screw rod 44 is rotatably installed on the additional disc frame 4, and a driven gear 45 is fixedly installed on the screw rod 44. The driven gear 45 is meshed and connected with the intermittent gear 43. A driving frame 46 is installed on the screw rod 44, and a plurality of connecting rod frames 47 are fixedly installed on the driving frame 46. The ends of the connecting rod frames 47 are slidably penetrated on the guide shaft 31. The driving frame 46 is connected to the box body 1 by bolts, and the connecting rod frame 47 is located on one side of the fixed seat body 21.

[0020] Combined with Figure 1-5 As shown, when installing the above components, first fix the annular disc frame 2 on the box body 1, and then the guide shaft body 31 on the connecting disc frame 3 passes through the fixed seat body 21. At this time, the box body 1 and the annular disc frame 2 are restricted on the guide shaft body 31, and then the threaded holes on the additional disc frame 4 and the threaded holes on the extension frame body 32 are aligned, and the additional disc frame 4 and the extension frame body 32 are connected with bolts. The guide shaft body 31 passes through the additional disc frame 4 and is fixedly connected to the additional disc frame 4 with nuts, and the connecting disc frame 3, the extension frame body 32 and the additional disc frame 4 are fixed to the inner wall of the reserved hole of the steel sheet pile by bolts.

[0021] In connection with the above, before the steel sheet pile is inserted into the soil layer, the clockwork timer 41 is rotated, and the output end drive shaft 42 of the clockwork timer 41 drives the driven gear 45 to rotate through the intermittent gear 43, and the driven gear 45 drives the screw rod 44 to rotate, and the connecting rod frame 47 slides on the upper limit of the guide shaft body 31. When the screw rod 44 rotates, the driving frame 46 moves synchronously with the connecting rod frame 47 in a directional linear motion, and the driving frame 46 is fixedly connected to the box body 1 by bolts, and then the driving frame 46 drives the box body 1 to move synchronously, so that the box body 1 moves away from the surface of the soil layer. At this time, the pressure membrane of the box body 1 will not contact the surface of the soil layer; it should be noted that the time set for the clockwork timer 41 needs to be greater than the time for the steel sheet pile to be inserted, preferably about 3 times the insertion time. In the process of inserting the steel sheet pile into the soil layer, the clockwork timer 41 is combined with the attached Figure 5 As 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 mesh with the driven gear 45, and the driven gear 45 is stationary. When the steel sheet pile is inserted to the specified position, the intermittent gear 43 meshes with the driven gear 45 and rotates, and the driving frame 46 on the screw rod 44 moves in the opposite direction, so that the box body 1 moves 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.

[0022] Both sides of the fixed seat body 21 are fixedly installed with an additional sleeve 26, and 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 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; both 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 acting shaft body 341 is installed inside the clamping sleeve 34, one end of the acting shaft body 341 is located in the through hole 331, and the other end of the acting shaft body 341 passes through and extends to the outside of the clamping sleeve 34; a circular plate frame 342 is rotatably sleeved on the acting shaft body 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 body 344 is fixedly installed on the acting shaft body 341, and an L-shaped groove body 345 is opened on the inner wall of the clamping sleeve 34, and the sliding shaft body 344 slides within the L-shaped groove body 345.

[0023] Combined with Figure 4 , 9 As 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 331. 1 limits the clamping shaft body 263, so that the fixed seat body 21, the annular disc frame 2 and the box body 1 are fixed, which serves the purpose of 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 action shaft body 341 located on the outside is pushed, so that the other end of the action shaft body 341 applies a force to the end of the clamping shaft body 263, so that the clamping shaft body 263 moves toward the inside of the clamping sleeve 34, and the circular panel 261 on the clamping shaft body 263 compresses the compression spring 262. In this process, the sliding shaft body 344 on the action shaft body 341 moves along the track of the L-shaped groove body 345; combined with the attached Fig.11As 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 disk rack 2, each fixed seat body 21 has two clamping shaft bodies 263. When the sliding shaft body 344 moves to the bottom of the L-shaped groove 345, the acting shaft body 341 is rotated to make the sliding shaft body 344 move to one end of the L-shaped groove 345, so that the acting shaft body 341 is fixed in this state to prevent the clamping shaft body 263 that has left the through hole 331 from returning to the through hole 331.

[0024] When the box body 1 is monitoring the soil layer pressure, there is groundwater infiltration in the soil layer. In order to prevent the pressure membrane of the box body 1 from contacting with water and causing errors in the monitoring data, the present invention makes the following design for this; a silicone membrane 22 is installed on the annular disc frame 2, and an opening 221 is opened on the silicone membrane 22. The opening 221 is located at the lowest point of the silicone membrane 22. The annular edge of one side of the silicone membrane 22 is curved and bent toward the central axis of the box body 1. A plurality of limiting sleeves 23 are fixedly installed on the annular disc frame 2, and a sliding plate frame 24 is installed on the inner wall of the limiting sleeve 23. The sliding plate frame 24 slides in a limited position inside the limiting sleeve 23. The sliding plate frame 24 An extension shaft body 241 is fixedly installed on it, and the end of the extension shaft body 241 passes through the limiting sleeve 23. The extension shaft body 241 and the limiting sleeve 23 are coaxially arranged, and one end of the extension shaft body 241 located outside the limiting sleeve 23 is fixedly connected to the annular pressure plate 242, and the annular pressure plate 242 is arranged on the inner wall of the silicone membrane 22; it should be noted that when the pressure membrane of the box body 1 is not in contact with the surface of the soil layer, 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 body 1, that is, when the box body 1 moves toward the soil layer, the silicone membrane 22 first contacts the soil layer, and then the annular pressure plate 242 contacts the soil layer through the silicone membrane 22, and finally the pressure membrane of the box body 1 contacts the soil layer again, wherein the annular pressure plate 242 corresponds to the bending area of ​​the silicone membrane 22 (the specific details can be combined with the attached Figure 6); A magnetic shaft 243 is fixedly mounted on the slide 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 within the straight groove 231 and the arc groove 232, a magnet block 233 is mounted on the inner wall of the end of the arc groove 232 away from the straight groove 231, the magnet block 233 generates suction with the magnetic shaft 243 moving into the arc groove 232, and the slide frame 24 A return spring 25 is connected 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 bent outward. The waterproof membrane 101 is used to block the moisture approaching the box body 1, and the silicone membrane 22 is used to block the moisture from top to bottom; when the moisture in the soil layer is high, the waterproof membrane 101 effectively blocks the moisture approaching the box body 1, and the waterproof membrane 101 and the silicone membrane 22 achieve the effect of blocking moisture.

[0025] Specifically, when the box body 1 moves toward the surface of the soil layer, the silicone membrane 22 first contacts the soil layer, and the silicone membrane 22 is squeezed by the soil layer and continues to bend. Since the end of the silicone membrane 22 bends toward the center line of the box body 1, the silicone membrane 22, which continues to bend under the force of the soil layer, will increase its bending degree. Then the annular pressure plate 242 contacts the soil layer through the silicone membrane 22 and is subjected to the force of the soil layer, and then the extended shaft 241 drives the sliding plate frame 24 to move toward the inside of the limiting sleeve 23. In this process, the magnetic shaft 243 on the sliding plate frame 24 moves along the straight groove body 231 moves. When the magnetic shaft 243 moves to the arc groove 232, one side of the pressure membrane of the box body 1 contacts the soil layer, and the magnetic shaft 243 enters into the arc groove 232 under the action of the magnet block 233, and then the sliding plate frame 24 is restricted in this state. Under the action of the extended shaft 241, the annular pressure plate 242 always acts on the silicone membrane 22 to seal the silicone membrane 22, and the opening 221 at the bottom of the silicone membrane 22 is used to discharge the moisture between the silicone membrane 22 and the waterproof membrane 101 to avoid moisture accumulation.

[0026] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0027] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present 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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