Shield tunnel stratum stress monitoring device

Abstract

The utility model relates to a kind of shield tunnel stratum stress monitoring devices, including frame body, slide plate, positioning plate, monitoring pile, driving rod and height monitoring piece, slide plate is equipped with at least two, slide plate is slidably connected with frame body, and slide plate has frame body one end to the distribution setting of other end;Positioning plate is connected between two adjacent slide plates;Monitoring pile is connected on positioning plate;Driving rod driving end is connected with the slide plate located in one end of frame body, remaining slide plate is slidably connected with driving rod, height monitoring piece includes multiple fixed plate groups distributed along vertical direction, multiple fixed plate groups are respectively fixed on each slide plate, when monitoring pile is inserted to corresponding depth of stratum, with corresponding fixed plate group abuts.This application technical scheme has beneficial technical effects: by adjusting driving screw, the spacing between positioning plate can be adjusted by slide plate, the accuracy of spacing control is improved when monitoring pile is constructed;Monitoring pile and fixed plate group cooperate, improve the accuracy of monitoring data.

Description

Technical Field

[0001] This utility model relates to the field of shield tunnels, and specifically to a shield tunnel ground stress monitoring device. Background Technology

[0002] A shield tunnel refers to a construction method that uses a tunnel boring machine (TBM). This method allows for tunnel excavation and muck removal while controlling the excavation face and surrounding rock to prevent collapse and instability. It also involves assembling tunnel segments inside the machine to form a lining and performing backfill grouting, thus constructing a tunnel without disturbing the surrounding rock.

[0003] During shield tunnel construction, the cutting of the soil by the shield cutterhead and the grouting reinforcement of the strata both affect the surrounding soil and rock. Soil loss and reconsolidation can lead to the redistribution of stress in the surrounding soil and rock and deformation of the tunnel structure. Therefore, monitoring of soil stress during shield tunnel construction is particularly important.

[0004] Existing methods for monitoring ground stress in shield tunnels typically involve driving monitoring piles into the ground to collect relevant information. However, during use and observation, it has been found that it is difficult to accurately control the distance between adjacent monitoring piles during construction. This can cause deviations in the spacing between monitoring piles, which in turn reduces the accuracy of the monitoring data.

[0005] Therefore, it is very necessary to provide a shield tunnel ground stress monitoring device to solve the above-mentioned technical problems. Utility Model Content

[0006] Based on the above description, this utility model provides a shield tunnel stratum stress monitoring device to solve the problem that in the prior art, it is difficult to accurately control the distance between adjacent monitoring piles during construction, which will cause deviations in the spacing between monitoring piles and thus reduce the accuracy of monitoring data.

[0007] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A shield tunnel stratum stress monitoring device includes a monitoring pile, a frame, a sliding plate, a positioning plate, a drive screw, and a height monitoring component. At least two sliding plates are provided, and the sliding plates are slidably connected to the frame, with the sliding plates distributed from one end of the frame to the other. The positioning plate is connected between two adjacent sliding plates, and the monitoring pile is connected to the positioning plate. The drive end of the drive screw is connected to the sliding plate located at one end of the frame, and the remaining sliding plates are slidably connected to the drive screw. The drive screw is configured to drive the sliding plate at its drive end to move, so that each sliding plate presses against each other to adjust the position of the center hole of the positioning plate. The height monitoring component includes multiple fixed plate groups distributed vertically, each fixed plate group being fixed on a sliding plate. When the monitoring pile is inserted to a corresponding depth in the stratum, it abuts against the corresponding fixed plate group.

[0008] Preferably, before inserting the monitoring pile, the sliding plate on that side is moved by driving the drive screw. The frontmost and rearmost sliding plates will move closer and press against each other, thus pressing the sliding plates together and adjusting the positioning plate to the appropriate position. Then, the monitoring pile is inserted into the positioning plate, allowing the monitoring pile to enter the tunnel stratum and begin monitoring the stratum stress.

[0009] In the above solution, the drive screw is threaded at the rotatable connection end with the frame, and the drive screw is also threaded to the front sliding plate. Therefore, after the drive screw rotates, its position will not easily change, thus ensuring that the center hole of the positioning plate remains fixed after adjustment. Furthermore, a limiting block is provided at the tail of the drive screw to prevent it from disengaging, which should also fall within the scope of protection of this application.

[0010] In addition, the height monitoring device is equipped with multiple fixed plate groups distributed vertically and fixed to each sliding plate. When the monitoring pile at the corresponding position is inserted into the stratum at the corresponding depth, it abuts against the corresponding fixed plate group, which can intuitively obtain the depth position of the monitoring pile in the stratum, thereby improving the accuracy of the data.

[0011] Meanwhile, the positioning plates in this application are made of flexible material, specifically hard rubber, which ensures that the distance between the positioning plates remains consistent during movement. Furthermore, due to its inherent rigidity, it does not easily deform under pressure, thus allowing for more precise adjustment of the center position of the positioning plates.

[0012] It is worth mentioning that the monitoring piles mainly use vibrating wire stress sensors to collect pipeline stress. For details, please refer to the integrated pipeline stress monitoring pile disclosed in CN206556790U. Since it is a mature existing technology, it will not be elaborated here.

[0013] Furthermore, when two skateboards are provided, the front skateboard is slidably connected to one end of the frame, the rear skateboard is slidably connected to the other end of the frame, and the positioning plate is connected between the two skateboards.

[0014] Preferably, when two sliding plates are provided, the front sliding plate is closer to one end of the frame, and the rear sliding plate is closer to the other end of the frame. The drive screw drives the front sliding plate to move towards the rear sliding plate, while the rear sliding plate, supported by the frame, does not move. The two sliding plates will engage with the positioning plate between them, causing the center hole on the positioning plate to move precisely to the appropriate position, thereby achieving accurate positioning of the monitoring pile.

[0015] Furthermore, when there are three or more slide plates, the slide plate located at the front end is slidably connected to one end of the frame, the slide plate located at the rear end is slidably connected to the other end of the frame, and the remaining slide plates are slidably connected to the middle of the frame. The positioning plate is connected between two adjacent slide plates, and the positioning plate is sequentially and alternately connected between two adjacent slide plates in the order of the side closer to the drive screw and the side farther away from the drive screw.

[0016] Preferably, when there are three or more sliding plates, the drive screw drives the front sliding plate to move towards the middle sliding plate of the frame, while the rear sliding plate does not move under the support of the frame. The front sliding plate presses against the positioning plate on the middle sliding plate, and the middle sliding plate presses against the rear sliding plate, thereby causing the center hole on the positioning plate to move precisely to the appropriate position, thus achieving accurate positioning of the monitoring pile.

[0017] Furthermore, the height monitoring component includes a clamp and a vertical plate, the clamp being connected to the monitoring pile; the vertical plate being connected to the sliding plate, and the fixing plate assembly being connected to the vertical plate.

[0018] Preferably, the upright plate is the supporting structure of the fixed plate assembly, and the monitoring pile is connected to the clamp. The clamp abuts against the fixed plate assembly at different heights to intuitively display the depth of the monitoring pile inserted into the tunnel strata.

[0019] Furthermore, each of the fixed plate assemblies includes a support rod, a limiting plate, a spring telescopic rod, and a pressure plate. Two support rods are provided, symmetrically arranged, and rotatably connected to the upright plate. A torsion spring is provided at the point of rotation between the support rod and the upright plate; one end of the torsion spring is connected to the support rod, and the other end is connected to the upright plate. The limiting plate is correspondingly arranged to the support rod and connected to the upright plate. The spring telescopic rod is connected to the support rod. The pressure plate is connected to the spring telescopic rod.

[0020] Preferably, each fixed plate assembly has two symmetrically arranged support rods rotatably connected to the upright plate, which have specific initial positions and elastic reset capabilities under the action of torsion springs. When the monitoring pile is inserted into the stratum to the corresponding depth and abuts against the fixed plate assembly, the support rods can rotate flexibly under the action of the monitoring pile, allowing the pressure plate to better fit the surface of the monitoring pile. At the same time, the elastic extension and contraction characteristics of the spring telescopic rod can ensure that the pressure plate and the monitoring pile maintain stable and appropriate pressure contact.

[0021] In addition, the setting of the limiting plate allows the support rod to reset after being pressed to a certain extent, so that the clamp can continue to press the next layer of pressure plate.

[0022] Furthermore, at least one rod groove is provided on the support rod, and a corresponding column is connected to the pressure plate, with the column slidably connected to the rod groove.

[0023] Preferably, a groove is provided on the support rod, and a column is connected to the pressure plate. The column and the groove are slidably connected, thereby limiting the position of the pressure plate during movement.

[0024] Furthermore, a drive spring is connected between two adjacent slide plates, and the drive spring is located at the end away from the drive screw.

[0025] Preferably, by setting the drive spring, the uniformity of force distribution on the skateboard during movement is improved.

[0026] Additionally, see below if necessary. Figure 8 As shown, increasing the length of the frame and positioning the drive screw at the center of the frame, with drive springs symmetrically connected to both ends of the drive screw to make the force on the slide plate more even during movement, should also fall within the scope of protection of this application.

[0027] Meanwhile, the drive spring can provide sufficient preload, and the Shore hardness of the positioning plate is preferably in the range of A80 to D60 to ensure that the positioning plate can undergo the necessary elastic bending to adapt to the spacing change when it moves with the slide to adjust the spacing. At the same time, it can provide sufficient support and guidance when the monitoring pile passes through, to prevent the monitoring pile from being inaccurately positioned due to the plate being too soft. Specific values ​​can be calibrated through experiments and are not limited here.

[0028] Furthermore, the frame is provided with a guide groove, and a guide slider is connected to the slide plate, with the guide slider slidably connected to the guide groove.

[0029] Preferably, by setting guide grooves on the frame and guide sliders on the slide, with the guide sliders slidably connected to the guide grooves, the slide remains on the same plane during movement.

[0030] Furthermore, a fixing ring is connected to the middle of the positioning plate, and multiple brush bristles are connected to the middle of the fixing ring.

[0031] Preferably, the bristles are used for cleaning the monitoring posts.

[0032] Furthermore, the fixing ring is connected in a ring shape with multiple scrapers, and the ring-shaped scrapers are arranged in multiple layers in the vertical direction; each scraper has a downwardly inclined arc structure.

[0033] Preferably, the monitoring pile is able to detach from the soil as it moves upward by using multiple layers of scrapers arranged in a ring shape with the scrapers having a downward-sloping arc structure.

[0034] Compared with the prior art, the technical solution of this application has the following beneficial technical effects: 1. By adjusting the drive screw, the sliding plate can adjust the spacing between the positioning plates, thereby improving the accuracy of spacing control during the construction of monitoring piles and making the acquired data more accurate; 2. When the monitoring piles at the corresponding locations are inserted to the corresponding depth in the stratum, they abut against the corresponding fixing plate group, which can intuitively obtain the depth of the monitoring piles inserted into the stratum, thereby improving the accuracy of the monitoring data. Attached Figure Description

[0035] Figure 1 A schematic diagram of the overall structure of a shield tunnel ground stress monitoring device provided for an embodiment of this utility model; Figure 2 A schematic diagram of the structure of a height monitoring component of a shield tunnel ground stress monitoring device provided in this embodiment of the utility model; Figure 3 for Figure 2 Enlarged structural diagram at point Q; Figure 4 This is one of the structural schematic diagrams of a fixed plate assembly in a shield tunnel ground stress monitoring device provided by an embodiment of the present utility model; Figure 5 A second schematic diagram of the structure of the fixed plate assembly in a shield tunnel ground stress monitoring device provided for an embodiment of this utility model; Figure 6 A schematic diagram of the structure of the fixing ring in a shield tunnel ground stress monitoring device provided for an embodiment of this utility model; Figure 7 A schematic diagram of the overall structure of a shield tunnel ground stress monitoring device with an added screw limiting head, provided for an embodiment of this utility model; Figure 8 A schematic diagram of a shield tunnel ground stress monitoring device with an added drive spring, provided for an embodiment of this utility model.

[0036] The attached diagram lists the components represented by each number as follows: 1. Frame; 11. Guide groove; 2. Slide board; 21. Guide slider; 3. Positioning plate; 4. Monitoring stake; 5. Drive screw; 51. Screw head; 52. Screw limit head; 6. Height monitoring components; 61. Fixed plate assembly; 611. Support rod; 612. Limiting plate; 613. Spring telescopic rod; 614. Pressure plate; 615. Rod groove; 616. Column; 62. Clamp; 63. Vertical board; 7. Drive spring; 8. Retaining ring; 81. Brush bristles; 82. Scraper; 9. Bumps. Detailed Implementation

[0037] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0038] Example 1: like Figure 1 , Figure 2 and Figure 4 As shown, a shield tunnel ground stress monitoring device includes a monitoring pile 4, a frame 1, sliding plates 2, positioning plates 3, a drive screw 5, and a height monitoring component 6. At least two sliding plates 2 are provided, slidably connected to the frame 1, and distributed from one end of the frame 1 to the other. The positioning plates 3 are connected between two adjacent sliding plates 2, and the monitoring pile 4 is connected to the positioning plates 3. The drive end of the drive screw 5 is connected to one of the sliding plates 2 located at one end of the frame 1, and the remaining sliding plates 2 are slidably connected to the drive screw 5. The drive screw 5 is configured to drive the sliding plates 2 at its drive end to move, so that each sliding plate 2 presses against each other to adjust the position of the center hole of the positioning plate 3. The height monitoring component 6 includes multiple fixed plate groups 61 distributed vertically, each fixed plate group 61 being fixed to each sliding plate 2. When the monitoring pile 4 is inserted to the corresponding depth in the ground, it abuts against the corresponding fixed plate group 61.

[0039] Meanwhile, when there are three or more slide plates 2, the slide plate 2 located at the front end is slidably connected to one end of the frame 1, the slide plate 2 located at the rear end is slidably connected to the other end of the frame 1, and the remaining slide plates 2 are slidably connected to the middle of the frame 1. The positioning plate 3 is connected between two adjacent slide plates 2, and the positioning plate 3 is sequentially and alternately connected between two adjacent slide plates 2 in the order of the side closer to the drive screw 5 and the side farther away from the drive screw 5.

[0040] Among them, see Figure 1 , Figure 2 and Figure 3 As shown, a drive spring 7 is connected between two adjacent slide plates 2, and the drive spring 7 is located at the end away from the drive screw 5. The frame 1 is provided with a guide groove 11, and a guide slider 21 is connected to the slide plate 2. The guide slider 21 is slidably connected to the guide groove 11.

[0041] During implementation, rotating the drive screw 5 moves the sliding plate 2 at the drive end. The force of the sliding plate 2 at the drive end is transmitted to the first positioning plate 3 and the drive spring 7. The first positioning plate 3 and the drive spring 7 then transmit the force to the middle positioning plate 3 and the drive spring 7, and further transmit the force to the subsequent corresponding sliding plates 2. This process continues until the force is transmitted to the last sliding plate 2 and the last drive spring 7. The last sliding plate 2 is then pressed against by the frame 1 and cannot move. This allows for adjustment of the center position of the positioning plate 3, making the installation position of the monitoring pile 4 more precise.

[0042] After adjusting the center position of the positioning plate 3, the monitoring pile 4 is inserted into the center position of the positioning plate 3. This ensures the accurate installation of the monitoring pile 4.

[0043] In this embodiment, by setting a guide groove 11 on the frame 1 and connecting a guide slider 21 on the slide plate 2, the guide slider 21 is slidably connected to the guide groove 11, ensuring that the slide plate 2 will not move in the vertical direction, thereby further improving the accuracy of the installation of the monitoring pile 4.

[0044] Additionally, see Figure 2 and Figure 7 As shown, multiple protrusions 9 are connected to the bottom of the frame 1. The protrusions 9 increase the contact area between the frame 1 and the ground, enhance the bonding effect between the frame 1 and the ground, and make the connection between the frame 1 and the ground more stable. In addition, a screw head 51 for easy rotation is connected to the drive screw 5, and a screw limit head 52 is connected to the tail end of the drive screw 5 to prevent the drive screw 5 from disengaging.

[0045] It should be noted that when there are three slide plates 2, the first positioning plate 3 is installed on the side closer to the drive spring 7, and the second positioning plate 3 is installed on the side closer to the drive screw 5. When there are more than three slide plates 2, the positioning plates 3 are arranged in this manner.

[0046] Example 2: Based on Example 1, see Figure 1 , Figure 4 and Figure 5 As shown, a height monitoring component 6 is provided, which includes a clamp 62 and a vertical plate 63. The clamp 62 is connected to the monitoring pile 4; the vertical plate 63 is connected to the sliding plate 2; and the fixing plate assembly 61 is connected to the vertical plate 63.

[0047] In the above embodiments, each fixed plate assembly 61 includes a support rod 611, a limiting plate 612, a spring telescopic rod 613, and a pressure plate 614. Two support rods 611 are provided, symmetrically arranged, and rotatably connected to the upright plate 63. A torsion spring is provided at the rotatable point between the support rod 611 and the upright plate 63, with one end connected to the support rod 611 and the other end connected to the upright plate 63. The limiting plate 612 is correspondingly arranged to the support rod 611 and connected to the upright plate 63. The spring telescopic rod 613 is connected to the support rod 611. The pressure plate 614 is connected to the spring telescopic rod 613.

[0048] In the above embodiment, at least one rod groove 615 is provided on the support rod 611, and a column 616 is correspondingly connected to the pressure plate 614. The column 616 is slidably connected to the rod groove 615.

[0049] In this embodiment, the clamp 62 on the monitoring pile 4 abuts against the uppermost pressure plate 614. During the descent of the monitoring pile 4, the pressure plate 614 presses against the spring telescopic rod 613. At the same time, the column 616 slides in connection with the rod groove 615, thereby ensuring that the pressure plate 614 always moves along the axial direction of the column 616 during the descent. When it moves to the limit position of the support rod 611, the clamp 62 slowly disengages from the pressure plate 614, the torsion spring drives the support rod 611 to reset, and the clamp 62 abuts against the pressure plate 614 of the next layer.

[0050] The working process of the height monitoring component 6 in the above embodiment is as follows: When the monitoring pile 4 descends, its outer clamp 62 first abuts against the uppermost pressure plate 614; as the monitoring pile 4 continues to descend, the pressure plate 614 is pressed and pushes the spring telescopic rod 613 to retract, while the column 616 slides along the rod groove 615 of the support rod 611 to ensure that the pressure plate 614 moves smoothly along the axial direction; when the support rod 611 rotates to the limit position defined by the limiting plate 612, the clamp 62 gradually disengages from the pressure plate 614 of that layer, the torsion spring drives the support rod 611 to reset, and then the clamp 62 abuts against the next layer of pressure plate 614, thereby realizing the step-like monitoring of the insertion depth of the monitoring pile 4.

[0051] In addition, the installation position of the limit plate 612 is adjusted according to the actual use to ensure the smooth rotation of the support rod 611 and to prevent interference with the rotation of the support rod 611 at the appropriate angle.

[0052] Simultaneously, when monitoring pile 4 is inserted into positioning plate 3, monitoring pile 18 moves along with clamp 62. As clamp 62 moves, it contacts support rod 611 and compresses it. Support rod 611 rotates under pressure, and when clamp 62 disengages from support rod 611, support rod 611 returns to its original position under the action of a spring. After the first monitoring pile 4 is inserted into the ground, the height of support rod 611 around clamp 62 can be used as a reference to ensure that the insertion depth of subsequent monitoring piles 4 is consistent with the depth of the first monitoring pile 4, thereby controlling the monitoring depth of the monitoring pile 4. When the monitoring pile 4 shakes during insertion, the support rod 611 will rotate in the opposite direction. When the support rod 611 rotates in the opposite direction, it will come into contact with the limiting plate 612 and be limited by the limiting plate 612, reducing the amplitude of the reverse rotation of the support rod 611, so that the monitoring pile 4 can be stably inserted into the formation. After the monitoring pile 4 is inserted into the formation, the clamp 62 will come into contact with the pressure plate 614. When the monitoring pile 4 shakes due to external factors, the clamp 62 will squeeze the pressure plate 614. After the pressure plate 614 is squeezed, it will transfer the pressure to the spring telescopic rod 613, so that the spring telescopic rod 613 is in a deformed state. Subsequently, under the elastic force of the spring telescopic rod 613, the pressure plate 614 applies pressure to the clamp 62 and the monitoring pile 4, reducing the amplitude of the shaking of the monitoring pile 4. When the monitoring pile 4 shakes due to external impact, it will squeeze the pressure plate 614. After being squeezed, the pressure plate 614 will move together with the spring telescopic rod 613. When the pressure plate 614 moves, it will move the column 616 together. When the column 616 moves, it will move smoothly under the limit of the rod groove 615. This further reduces the offset distance of the monitoring pile 4, making the movement of the monitoring pile 4 more stable.

[0053] Example 3: Based on the above embodiments, see Figure 1 and Figure 6As shown, a fixing ring 8 is connected to the middle of the positioning plate 3, and multiple bristles 81 are connected to the middle of the fixing ring 8. At the same time, multiple scrapers 82 are connected in a ring shape on the fixing ring 8, and the scrapers 82 arranged in a ring shape have multiple layers in the vertical direction; each scraper 82 has a downwardly inclined arc structure.

[0054] In this embodiment, when the monitoring pile 4 needs to be pulled upwards, the downward-sloping arc-shaped scraper 82 will remove the soil. The brush 81 will then clean the monitoring pile 4.

[0055] Compared with the prior art, the technical solution of this application has the following beneficial technical effects: 1. By adjusting the drive screw, the sliding plate can adjust the spacing between the positioning plates, thereby improving the accuracy of spacing control during the construction of monitoring piles and making the acquired data more accurate; 2. When the monitoring piles at the corresponding locations are inserted to the corresponding depth in the stratum, they abut against the corresponding fixing plate group, which can intuitively obtain the depth of the monitoring piles inserted into the stratum, thereby improving the accuracy of the monitoring data.

[0056] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A ground stress monitoring device for shield tunnels, comprising monitoring piles (4), characterized in that, Also includes: Frame (1); The slide (2) is provided in at least two, the slide (2) is slidably connected to the frame (1), and the slide (2) is distributed from one end of the frame (1) to the other end; A positioning plate (3) is connected between two adjacent sliding plates (2), and the monitoring stake (4) is connected to the positioning plate (3); A drive screw (5) is connected at its drive end to a slide plate (2) located at one end of the frame (1), and the remaining slide plates (2) are slidably connected to the drive screw (5). The drive screw (5) is configured to drive the slide plate (2) at its drive end to move so that each slide plate (2) presses against each other to adjust the position of the center hole of the positioning plate (3). The height monitoring component (6) includes multiple fixed plate groups (61) distributed along the vertical direction. The multiple fixed plate groups (61) are respectively fixed on each of the sliding plates (2) and abut against the corresponding fixed plate group (61) when the monitoring pile (4) is inserted to the corresponding depth of the stratum.

2. The shield tunnel ground stress monitoring device according to claim 1, characterized in that, When there are two slide plates (2), the front slide plate (2) is slidably connected to one end of the frame (1), and the rear slide plate (2) is slidably connected to the other end of the frame (1). The positioning plate (3) is connected between the two slide plates (2).

3. The shield tunnel ground stress monitoring device according to claim 1, characterized in that, When there are three or more slide plates (2), the slide plate (2) located at the front end is slidably connected to one end of the frame (1), the slide plate (2) located at the rear end is slidably connected to the other end of the frame (1), and the remaining slide plates (2) are slidably connected to the middle of the frame (1). The positioning plate (3) is connected between two adjacent slide plates (2), and the positioning plate (3) is sequentially and alternately connected between two adjacent slide plates (2) in the order of the side closer to the drive screw (5) and the side farther away from the drive screw (5).

4. The shield tunnel ground stress monitoring device according to claim 1, characterized in that, The height monitoring device (6) includes: A clamp (62) is attached to the monitoring pile (4); The upright plate (63) is connected to the slide plate (2), and the fixed plate assembly (61) is connected to the upright plate (63).

5. The shield tunnel ground stress monitoring device according to claim 4, characterized in that, Each of the aforementioned fixed plate assemblies (61) includes: There are two support rods (611), which are symmetrically arranged. The two support rods (611) are rotatably connected to the upright plate (63). A torsion spring is provided at the rotatable part of the support rod (611) and the upright plate (63). One end of the torsion spring is connected to the support rod (611), and the other end of the torsion spring is connected to the upright plate (63). A limiting plate (612) is provided corresponding to the support rod (611), and the limiting plate (612) is connected to the upright plate (63); A spring telescopic rod (613) is connected to the support rod (611); Pressure plate (614) is connected to the spring telescopic rod (613).

6. The shield tunnel ground stress monitoring device according to claim 5, characterized in that, At least one rod groove (615) is provided on the support rod (611), and a column (616) is correspondingly connected to the pressure plate (614). The column (616) is slidably connected to the rod groove (615).

7. The shield tunnel ground stress monitoring device according to claim 1, characterized in that, A drive spring (7) is connected between two adjacent slide plates (2), and the drive spring (7) is located at the end away from the drive screw (5).

8. The shield tunnel ground stress monitoring device according to claim 1, characterized in that, The frame (1) is provided with a guide groove (11), and the slide plate (2) is connected with a guide slider (21), which is slidably connected to the guide groove (11).

9. A shield tunnel ground stress monitoring device according to claim 1, characterized in that, The positioning plate (3) is connected to a fixing ring (8) in the middle, and multiple bristles (81) are connected to the fixing ring (8) in the middle.

10. A shield tunnel ground stress monitoring device according to claim 9, characterized in that, The fixing ring (8) is connected in a ring shape with multiple scrapers (82), and the scrapers (82) arranged in a ring shape have multiple layers in the vertical direction; each scraper (82) has a downwardly inclined arc structure.

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