Stress monitoring device based on top-down covering and digging station holing roof structure

Abstract

The invention discloses a stress monitoring device based on a top-down covering and digging station holing roof structure, and relates to the technical field of civil engineering, the stress monitoring device comprises a stress monitoring device main body, a detection head is installed on the stress monitoring device main body, a handle is installed on the outer wall of the detection head, a sleeve is installed on the outer wall of the handle, and the sleeve is connected with the stress monitoring device main body. A plurality of strip-shaped openings are formed in the outer wall of the sleeve, the strip-shaped openings extend in the axial direction of the sleeve, and supporting plates and sliding blocks are arranged in the strip-shaped openings; according to the invention, the detection head is placed in a to-be-detected gap, the handle enters along with the detection head, the right end of the supporting plate is fixed in the strip-shaped opening, the left end of the supporting plate can horizontally reciprocate and is fixed on the sliding block, the sliding block can slide in the strip-shaped opening, the sliding block moves rightwards, and the left end of the supporting plate is close to the right end, gradually bends and protrudes and stops when abutting against the inner wall of the gap. The bent supporting plate is clamped between the gap fixing handle and the detection head, and the bending degree can be adjusted according to needs, so that the detection head is stabilized in the gap.

Description

Technical Field

[0001] The invention relates to the technical field of civil engineering, and in particular to a force monitoring device based on a cover-and-cut reverse construction station opening top plate structure. Background Art

[0002] The stress monitoring device based on the top plate structure of the cover-and-cut reverse-construction station opening is mainly used to monitor in real time the stress state and deformation of the top plate and supporting structure during the construction process, to ensure structural safety and optimize the construction process. Its core function is to dynamically monitor the stress, displacement and other parameters of key parts through sensors and data acquisition systems, thereby preventing the risk of structural failure and providing a scientific basis for construction adjustments.

[0003] The top plate of a hole is prone to cracks during construction or operation due to stress concentration, settlement differences, etc. These cracks are important indicators of structural safety. When monitoring, sensors need to be embedded inside the cracks to directly monitor the width changes, strain distribution, and expansion rate of the cracks, thereby evaluating the degree of structural damage in real time. After the monitoring head of the force monitoring device is inserted into the gap, the structure will produce a small displacement due to disturbance. It is necessary to wait for 1-2 hours for the initial deformation to stabilize and avoid the influence of dynamic changes on the reference value. During this process, the user needs to hold the monitoring head. Since keeping a fixed posture for a long time can easily cause hand tremors or muscle strain, it will cause the monitoring head to shift or poor contact. Therefore, in the prior art, a fixing frame is usually required to assist in fixing the monitoring head. However, there is a defect: the location of the crack and the surrounding terrain are different. Not all terrains are suitable for the placement and installation of the fixing frame, which will reduce the adhesion between the fixing frame and the structural surface, making the fixing frame easy to loosen and shift, thereby causing displacement and instability of the monitoring head. Summary of the invention

[0004] The object of the present invention is to provide a force monitoring device based on the top plate structure of a cover-and-excavation station opening, so as to solve the problem that the locations of the cracks and the surrounding terrains mentioned in the above background technology are different, and not all terrains are suitable for the placement and installation of the fixing frame, which will reduce the adhesion between the fixing frame and the surface of the structure, making the fixing frame easy to loosen and shift, thereby causing the displacement and instability of the monitoring head.

[0005] In order to solve the above technical problems, the present invention provides a force monitoring device based on a cover-excavation reverse construction station opening roof structure, comprising a force monitoring device body, a detection head is installed on the force monitoring device body, a handle is installed on the outer wall of the detection head, and further comprising: A sleeve is installed on the outer wall of the handle, and a plurality of strip openings are opened on the outer wall of the sleeve. The strip openings extend along the axial direction of the sleeve, and a support plate and a slider are arranged inside the strip openings. The slider is slidably arranged inside the strip openings, one end of the support plate is connected to the inner wall of the strip opening, and the other end is connected to the top of the slider. The support plate is elastic, and the support plate is located at the exit of the strip opening.

[0006] Furthermore, the bottom and top of the support plate are provided with a plurality of cutouts, the cutout at the bottom of the support plate is located on one side of the slider, and the cutout at the top of the support plate is close to an end where the support plate is connected to the sleeve.

[0007] Furthermore, the cutout is configured to be triangular in shape, and the open end of the cutout is located on the outer wall of the support plate.

[0008] Furthermore, a screw rod is provided in the strip-shaped opening, and the screw rod extends along the axial direction of the strip-shaped opening. One end of the screw rod is rotatably connected to the inner wall of the strip-shaped opening, and the other end is inserted into the sleeve and extends to the outside of the sleeve. The screw rod is rotatably connected to the inner wall of the sleeve, and the slider is threadedly connected to the outer wall of the screw rod, and the top of the slider is against the inner top wall of the strip-shaped opening.

[0009] Furthermore, there is a gap between one side of the support plate and the inner wall of one side of the strip opening, and the support plate is provided with a strip slide groove, in which a pull rod is slidably buckled, and one end of the pull rod extends to the outside of the strip opening, and the area where the pull rod is located between the support plate and the strip opening is against the support plate and the inner wall of the strip opening.

[0010] Furthermore, a strip groove is provided on one side of the strip opening, and the strip groove is opened on the outer wall of the sleeve. A connecting rod is installed on the outer wall of the pull rod, and one end of the connecting rod extending to the inside of the strip groove is connected to a limiting bead. A plurality of steel balls are connected to the inner wall of the strip groove, and the steel balls are arranged at equal intervals along the axial direction of the strip groove, and the outer wall of the steel ball is against the outer wall of the limiting bead.

[0011] Furthermore, one end of the limiting bead is narrower, the narrow end of the limiting bead is gradually widened, and the outer wall of the limiting bead is smooth. There is an inclined surface between the wide end and the narrow end of the limiting bead. The limiting bead is provided with an annular groove, and a ring is sleeved in the annular groove. The end of the connecting rod extending to the inside of the strip groove is connected to the outer wall of the ring.

[0012] Furthermore, a knob is installed on one end of the screw rod extending to the outside of the sleeve.

[0013] Furthermore, the support plate is penetrated by a through opening, the through opening extends along the axial direction of the support plate, the inner wall of the through opening is provided with a strip groove, a ball is slidably buckled in the strip groove, the outer wall of the ball is connected to a support rod, the end of the support rod away from the ball is connected to a squeezing ball, and the outer wall of the squeezing ball is abutted against the inner wall on the other side of the through opening.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, the detection head is placed in the gap to be detected, and the handle is inserted therewith. The right end of the support plate is fixed in the strip opening, and the left end can move horizontally back and forth and is fixed on the slider. The slider can slide in the strip opening. The slider moves to the right, and the left end of the support plate approaches the right end and gradually bends and protrudes, and stops when it touches the inner wall of the gap. The bent support plate is stuck in the gap to fix the handle and the detection head. The degree of bending can be adjusted as needed to make the detection head stable in the gap.

[0015] 2. In the present invention, when the left end of the support plate approaches the right end and gradually bends, the area below the left end will bend inward. The material here is prone to accumulate toward the neutral axis due to pressure and wrinkles appear. The incision allows the material to slide or fold along it, which not only disperses the stress and makes the deformation more uniform, but also diffuses the originally concentrated stress, avoiding the stress peak metamaterial yield strength causing fracture. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the appearance of the present invention; Figure 2 It is a schematic diagram of the overall structure of the present invention; Figure 3 It is a schematic diagram of the connection structure between the handle and the sleeve in the present invention; Figure 4 It is a schematic diagram of the connection structure between the sleeve and the strip-shaped opening in the present invention; Figure 5 It is a schematic diagram of the connection structure between the strip opening and the support plate in the present invention; Figure 6 It is a schematic diagram of the connection structure between the screw rod and the slider in the present invention; Figure 7 It is a schematic diagram of the connection structure between the support plate and the strip slide in the present invention; Figure 8 Schematic diagram of the connection structure between the support plate and the through hole in the present invention Fig. 9 It is a schematic diagram of the connection structure between the pull rod and the connecting rod in the present invention; Fig.10 for Figure 4 A magnified view of the structure at center.

[0017] In the figure: 1. The main body of the force monitoring device; 2. Detection head; 3. Handle; 4. Sleeve; 5. Strip opening; 6. Support plate; 7. Strip groove; 8. Screw rod; 9. Slider; 10. Strip groove; 11. Steel ball; 12. Pull rod; 13. Limiting bead; 14. Connecting rod; 15. Incision; 16. Annular groove; 17. Ring; 18. Through port; 19. Strip slot; 20. Ball; 21. Support rod; 22. Extrusion ball. 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] The present invention provides a technical solution: See also Figure 1-Figure 10 As shown, a force monitoring device based on a top plate structure of a station opening for cover-excavation reverse construction includes a force monitoring device body 1, a detection head 2 is installed on the main body 1 of the force monitoring device, a handle 3 is fixedly installed on the outer wall of the detection head 2, and further includes: A sleeve 4 is fixedly mounted on the outer wall of the handle 3. A plurality of strip openings 5 ​​are formed on the outer wall of the sleeve 4. The strip openings 5 ​​extend axially along the sleeve 4. A support plate 6 and a slider 9 are arranged inside the strip opening 5. The slider 9 is slidably arranged inside the strip opening 5. One end of the support plate 6 is fixedly connected to the inner wall of the strip opening 5, and the other end is fixedly connected to the top of the slider 9. The support plate 6 is elastic and is located at the exit of the strip opening 5.

[0020] After the detection head 2 is placed in the gap to be detected, the handle 3 is placed in the gap along with the detection head 2, and then Figure 4 From the perspective of the support plate 6, the right end of the support plate 6 is fixed in the strip opening 5, and the left end of the support plate 6 can freely reciprocate horizontally. The left end of the support plate 6 is fixed on the slider 9, and the slider 9 can slide along the inside of the strip opening 5. The width of the slider 9 is larger than the exit of the strip opening 5, so the slider 9 will not fall out of the strip opening 5. When the slider 9 is at the leftmost side of the strip opening 5, the support plate 6 will be close to the outer surface of the sleeve 4. When the slider 9 moves to the right, since the right end of the support plate 6 is fixed, as the left end of the support plate 6 moves toward the right end of the support plate 6, the elastic support plate 6 will gradually bend and then protrude from the outer surface of the sleeve 4 until the bent support plate 6 hits the inner wall of the gap, the slider 9 stops moving, and then the bent support plate 6 is stuck in the gap, so that the handle 3 and the detection head 2 are fixed; Furthermore, there are multiple support plates 6, and the bending degrees of the multiple support plates 6 can be adjusted according to the distances between the different inner walls of the gap and the sleeve 4. The multiple support plates 6 can be tightly against the gap, further fixing the position of the detection head 2 to ensure the stability of the detection head 2.

[0021] See also Figure 4-Figure 10 A plurality of cutouts 15 are provided at the bottom and the top of the support plate 6 . The cutout 15 at the bottom of the support plate 6 is located on one side of the slider 9 , and the cutout 15 at the top of the support plate 6 is close to the end where the support plate 6 is connected to the sleeve 4 .

[0022] exist Figure 7 It can be seen that one of the cutouts 15 is at the lower left of the support plate 6, while the other cutout 15 is at the upper right of the support plate 6. When the left end of the support plate 6 approaches the right end of the support plate 6, the left end of the support plate 6 will gradually bend, and the area where the left cutout 15 is located will bend inward. This part of the inwardly bent material will be compressed and accumulate toward the neutral axis, which is prone to wrinkling due to excessive local stress. The existence of the cutout 15 allows the material to slide or fold along the direction of the cutout 15, dispersing the compressive stress and making the deformation more uniform. In addition, the cutout 15 diffuses the stress originally concentrated on the inner side of the bend to a larger area, avoiding fracture caused by the stress peak exceeding the yield strength of the material. When the right side end of the support plate 6 is bent, since the bending is from left to right, the upper side is bent inward when the right side is bent, so the cutout 15 on the right side is above the support plate 6.

[0023] See also Fig.10 The cutout 15 is set to be triangular in shape, and the open end of the cutout 15 is located on the outer wall of the support plate 6.

[0024] When the support plate 6 is bent, the inner side is subjected to compressive stress. The wide end of the triangular cutout 15 is located on the outside, that is, close to the outer wall of the support plate 6, while the narrow end points to the inner compression zone. This design can diffuse the concentrated compressive stress along the hypotenuse of the triangle to a larger area, avoiding the local stress peak from exceeding the yield strength of the material. Compared with the rectangular cutout 15, the hypotenuse of the triangular cutout 15 can effectively reduce the stress concentration at the tip of the cutout 15, thereby reducing the risk of crack initiation caused by stress concentration.

[0025] See also Figure 4-Figure 10 A screw rod 8 is arranged in the strip opening 5, and the screw rod 8 extends along the axial direction of the strip opening 5. One end of the screw rod 8 is rotatably connected to the inner wall of the strip opening 5, and the other end is inserted into the sleeve 4 and extends to the outside of the sleeve 4. The screw rod 8 is rotatably connected to the inner wall of the sleeve 4, and the slider 9 is threadedly connected to the outer wall of the screw rod 8, and the top of the slider 9 is against the inner top wall of the strip opening 5.

[0026] by Figure 4From the perspective of , when the screw rod 8 is turned outside the sleeve 4, the screw rod 8 can be driven to slide along the outer wall of the screw rod 8 when the screw rod 8 is turned, so that when the screw rod 8 is turned clockwise, the slide block 9 will move to the right, and when the screw rod 8 is turned counterclockwise, the slide block 9 will rotate to the left, so that the moving slide block 9 can drive the support plate 6 to bulge or approach the outer wall of the sleeve 4, the outlet of the strip opening 5 is narrower than the overall width of the strip opening 5, and the slide block 9 is wider than the outlet of the strip opening 5, and the width of the support plate 6 is within the range of the outlet width of the strip opening 5, so the support plate 6 can move in the outlet of the strip opening 5, and the slide block 9 will not fall out of the outlet of the strip opening 5; At the same time, the outer wall of the slider 9 is in close contact with the inner wall of the strip-shaped opening 5 , so when the screw rod 8 rotates, the slider 9 does not rotate but only moves along the outer wall of the screw rod 8 .

[0027] See also Figure 5 There is a gap between one side of the support plate 6 and the inner wall of one side of the strip opening 5. The support plate 6 is provided with a strip slide groove 10. A pull rod 12 is slidably buckled in the strip slide groove 10. One end of the pull rod 12 extends to the outside of the strip opening 5. The pull rod 12 is located in the area between the support plate 6 and the strip opening 5, and is against the support plate 6 and the inner wall of the strip opening 5.

[0028] Since it is impossible to determine whether the support plate 6 is convex on the left or right side after the support plate 6 is convex, for irregular gaps, the pull rod 12 can be moved. Figure 5 It can be seen that the part of the pull rod 12 extending to the outside of the sleeve 4 fits the outer wall of the sleeve 4. When the left side of the support plate 6 is fixed, the pull rod 12 can be pushed to move toward the right end of the support plate 6. When the pull rod 12 moves, it will flatten the raised part of the support plate 6, so that the raised part on the left side of the support plate 6 is pushed to the right; The raised portion of the support plate 6 is changed to adapt to the shape of the crack, so that the support plate 6 can better fit the inner wall of the crack.

[0029] See also Figure 5 A strip groove 7 is also provided on one side of the strip opening 5. The strip groove 7 is opened on the outer wall of the sleeve 4. A connecting rod 14 is fixedly installed on the outer wall of the pull rod 12. One end of the connecting rod 14 extends to the inside of the strip groove 7 and is connected to a limiting bead 13. A plurality of steel balls 11 are fixedly connected to the inner wall of the strip groove 7. The steel balls 11 are arranged at equal intervals along the axial direction of the strip groove 7, and the outer wall of the steel ball 11 is against the outer wall of the limiting bead 13.

[0030] When the pull rod 12 moves, it will drive the limiting bead 13 to move along the inside of the strip groove 7. The steel ball 11 in the strip groove 7 has a squeezing effect on the limiting bead 13. Although the limiting bead 13 can pass through the steel ball 11, the outer wall of the steel ball 11 is in close contact with the outer wall of the limiting bead 13. This can prevent the pull rod 12 from being pushed and moved by the raised support plate 6 after reaching the position. After the pull rod 12 moves to the appropriate position, you can just let go. The steel ball 11 can prevent the limiting bead 13 from easily shifting by friction with the limiting bead 13.

[0031] See also Fig. 9 One end of the limiting bead 13 is narrower, the narrow end of the limiting bead 13 is gradually widened, and the outer wall of the limiting bead 13 is smooth. There is an inclined surface between the wide end and the narrow end of the limiting bead 13. The limiting bead 13 is provided with an annular groove 16, and a ring 17 is sleeved in the annular groove 16. One end of the connecting rod 14 extends to the inside of the strip groove 7 and is fixedly connected to the outer wall of the ring 17.

[0032] When the narrow end of the limiting bead 13 faces right, the pull rod 12 moves to the right, and the limiting bead 13 can easily pass through the steel ball 11 through the narrow end. When the limiting bead 13 stops moving, the wide end of the limiting bead 13 abuts against the outer wall of the steel ball 11, and the wide end abuts against the outer wall of the steel ball 11, so that the limiting bead 13 will not move to the left. This is because when the narrow end contacts first, the force decomposition and the smaller contact area reduce the resistance; when the wide end contacts first, the reverse component force and the increased friction force make it impossible to pass. When the pull rod 12 needs to move to the left, it is only necessary to rotate the limiting bead 13 to turn the narrow end of the limiting bead 13 to the left. At this time, the pull rod 12 can be pushed to move to the left, and the annular groove 16 will rotate along the inner wall of the ring 17 when the limiting bead 13 moves.

[0033] See also Figure 4 One end of the screw rod 8 extending to the outside of the sleeve 4 is fixedly mounted with a knob.

[0034] Holding the knob and turning it can drive the screw rod 8 to rotate. Since the outer wall of the screw rod 8 has threads, directly turning the screw rod 8 with bare hands can easily scratch the palm and is not easy to operate.

[0035] See also Figure 7-Figure 8 A through opening 18 is formed through the support plate 6, and the through opening 18 extends along the axial direction of the support plate 6. A strip groove 19 is formed on the inner wall of the through opening 18, and a ball 20 is slidably buckled in the strip groove 19. A support rod 21 is fixedly connected to the outer wall of the ball 20, and an extrusion ball 22 is fixedly connected to one end of the support rod 21 away from the ball 20, and the outer wall of the extrusion ball 22 is against the inner wall of the other side of the through opening 18.

[0036] After the support plate 6 bulges, the left and right sides of the through hole 18 will gradually separate, and the two inner walls of the through hole 18 will gradually move away from each other, so that the outer wall of the gap in contact with the support plate 6 can be widened, increasing the contact area between the support plate 6 and the gap. Figure 8 It can be seen that the length of the support rod 21 is slightly longer than the distance between the two inner walls after the opening 18 is widened. Therefore, when the expansion area of ​​the support plate 6 is reached, the support rod 21 and the ball 20 can be slid along the strip groove 19 to the bulging part of the support plate 6; Then, the squeezing ball 22 is moved to slide along the inner wall of the opening 18 so that the squeezing ball 22 is moved to a position parallel to the ball 20. In this way, the inner walls on both sides of the opening 18 can be lifted up by the length of the support rod 21. The closer the squeezing ball 22 is to a position parallel to the ball 20, the wider the outer wall of the support plate 6 is, and the easier it is to get stuck in the gap. At the same time, the support rod 21 is pushed into the opening 18, which also prevents the opening 18 from being easily closed due to the squeezing of the gap.

Claims

1. A force monitoring device based on a top plate structure of a station opening with cover and excavation reverse construction, comprising a force monitoring device body (1), a detection head (2) being mounted on the force monitoring device body (1), and a handle (3) being mounted on the outer wall of the detection head (2), characterized in that: Also includes: A sleeve (4) is mounted on the outer wall of the handle (3). A plurality of strip openings (5) are formed on the outer wall of the sleeve (4). The strip openings (5) extend in the axial direction of the sleeve (4). A support plate (6) and a slider (9) are arranged inside the strip opening (5). The slider (9) is slidably arranged inside the strip opening (5). One end of the support plate (6) is connected to the inner wall of the strip opening (5), and the other end is connected to the top of the slider (9). The support plate (6) is elastic, and is located at the outlet of the strip opening (5).

2. A stress monitoring device based on the top plate structure of a cover-excavation station opening as claimed in claim 1, characterized in that: The bottom and top of the support plate (6) are both provided with a plurality of cutouts (15); the cutout (15) at the bottom of the support plate (6) is located on one side of the slider (9), and the cutout (15) at the top of the support plate (6) is close to an end where the support plate (6) is connected to the sleeve (4).

3. A stress monitoring device based on the top plate structure of a cover-excavation station opening as claimed in claim 2, characterized in that: The cutout (15) is arranged in a triangular shape, and the open end of the cutout (15) is located on the outer wall of the support plate (6).

4. A stress monitoring device based on the top plate structure of a station opening in a cover-excavation reverse construction according to claim 3, characterized in that: A screw rod (8) is arranged in the strip-shaped opening (5), and the screw rod (8) extends along the axial direction of the strip-shaped opening (5). One end of the screw rod (8) is rotatably connected to the inner wall of the strip-shaped opening (5), and the other end is inserted through the sleeve (4) and extends to the outside of the sleeve (4). The screw rod (8) is rotatably connected to the inner wall of the sleeve (4), and the slider (9) is threadedly connected to the outer wall of the screw rod (8), and the top of the slider (9) abuts against the inner top wall of the strip-shaped opening (5).

5. A stress monitoring device based on the top plate structure of a station opening in a cover-excavation reverse construction according to claim 4, characterized in that: There is a gap between one side of the support plate (6) and the inner wall of one side of the strip opening (5); the support plate (6) is provided with a strip slide groove (10); a pull rod (12) is slidably buckled in the strip slide groove (10); one end of the pull rod (12) extends to the outside of the strip opening (5); the area where the pull rod (12) is located between the support plate (6) and the strip opening (5) abuts against the support plate (6) and the inner wall of the strip opening (5).

6. A stress monitoring device based on the top plate structure of a cover-excavation station opening as claimed in claim 5, characterized in that: A strip groove (7) is also provided on one side of the strip opening (5), and the strip groove (7) is opened on the outer wall of the sleeve (4). A connecting rod (14) is installed on the outer wall of the pull rod (12), and one end of the connecting rod (14) extending to the inside of the strip groove (7) is connected to a limiting bead (13). The inner wall of the strip groove (7) is connected to a plurality of steel balls (11), and the steel balls (11) are arranged at equal intervals along the axial direction of the strip groove (7), and the outer wall of the steel ball (11) abuts against the outer wall of the limiting bead (13).

7. A stress monitoring device based on the top plate structure of a station opening in a cover-and-cut reverse construction according to claim 6, characterized in that: One end of the limiting bead (13) is relatively narrow, the narrow end of the limiting bead (13) is gradually widened, and the outer wall of the limiting bead (13) is smooth. The limiting bead (13) has an inclined surface between the wide end and the narrow end. The limiting bead (13) is provided with an annular groove (16), and a collar (17) is sleeved in the annular groove (16). One end of the connecting rod (14) extending to the inside of the strip groove (7) is connected to the outer wall of the collar (17).

8. A stress monitoring device based on the top plate structure of a station opening in a cover-excavation reverse construction according to claim 7, characterized in that: A knob is installed on one end of the screw rod (8) extending to the outside of the sleeve (4).

9. A stress monitoring device based on the top plate structure of a station opening in a cover-excavation reverse construction according to claim 8, characterized in that: The support plate (6) is provided with a through opening (18) extending along the axial direction of the support plate (6); the inner wall of the through opening (18) is provided with a strip-shaped slot (19); a ball (20) is slidably buckled in the strip-shaped slot (19); the outer wall of the ball (20) is connected to a support rod (21); an end of the support rod (21) away from the ball (20) is connected to a squeezing ball (22); the outer wall of the squeezing ball (22) abuts against the inner wall of the other side of the through opening (18).

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