A pipeline settlement deformation monitoring device in subway foundation pit excavation construction

Abstract

The present invention relates to the field of pipeline settlement detection, and discloses a pipeline settlement deformation monitoring device in subway foundation pit excavation construction, including a detection box and a positioning slide rail, wherein the positioning slide rail is installed on a base, and fixed frames are installed at both ends of the positioning slide rail, the positioning slide rail is arranged horizontally, the detection box is slidably connected to the positioning slide rail, and a level meter is connected between the two fixed frames. The present invention installs two fixed frames on a base equipped with pipelines, and then puts the two bases and the positioning slide rails in a horizontal position by observing the level meter. When detecting, the detection box is slid on the base, and a detection seam is excavated in the base under the action of a digging shovel, and the bottom end of the digging shovel contacts the top of the pipeline. At this time, a pulley located behind the detection box contacts the top of the pipeline. When a certain position of the pipeline is higher or lower, the pulley is allowed to slide up or down, thereby completing the detection of the settlement degree of the pipeline.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline settlement detection, and in particular to a pipeline settlement deformation monitoring device in subway foundation pit excavation construction. Background Art

[0002] Pipeline settlement refers to the vertical displacement of the pipeline, which is usually caused by factors such as changes in internal stratum stress, changes in groundwater levels, soil compression or external loads. During pipeline design and construction, the impact of various factors on pipeline settlement should be considered, and corresponding measures should be taken to reduce or avoid the occurrence of settlement; the existing pipeline settlement device cannot intuitively see the area where the pipeline has settled during detection, and it is necessary to observe the digital display to make a judgment. Summary of the invention

[0003] The present invention provides the following technical solutions:

[0004] A pipeline settlement deformation monitoring device in subway foundation pit excavation construction comprises a detection box and a positioning slide rail, wherein the positioning slide rail is installed on a base, and fixing frames are installed at both ends of the positioning slide rail, the positioning slide rail is arranged horizontally, the detection box is slidably connected to the positioning slide rail, and a level meter is connected between the two fixing frames;

[0005] A pulley is installed inside the detection box, a pulley frame is installed above the pulley, the pulley is rotatably connected to the bottom of the pulley frame, a digging device is arranged in front of the pulley, the digging device includes a digging shovel, the front end of the digging shovel has a cutting edge, the digging shovel is fixed to the bottom of the detection box, when the detection box moves forward, the digging shovel digs the soil of the base, so that the base forms a detection seam, the detection seam extends to the top of the pipeline inside the base, so that the bottom end of the pulley can contact the top surface of the pipeline;

[0006] The pulley frame extends to the interior of the detection box, a detection spring is connected to the top of the pulley frame, a pressure sensor is connected to the top of the detection spring, a controller is installed inside the detection box, a display screen is connected to the top of the detection box, and the pressure sensor, controller and display screen are electrically connected;

[0007] By installing two fixed frames on the base with pipelines, and then observing the level meter to make the two bases and the positioning slide rails in a horizontal position, when testing, slide the test box on the base, and dig a test seam in the base under the action of the digging shovel, and the bottom end of the digging shovel contacts the top of the pipeline. At this time, the pulley behind the test box contacts the top of the pipeline. When a certain position of the pipeline is higher or lower, the pulley will slide up or down, driving the pulley frame to slide up and down, and the top of the pulley frame drives the detection spring to compress or stretch. Finally, the pressure change of the detection spring is detected by the pressure sensor, and then the data is transmitted to the controller. The controller detects the settlement degree of the pipeline according to the pressure value of the detection spring, and finally converts the electrical signal into a digital signal and displays it on the display screen, thereby completing the detection of the settlement degree of the pipeline.

[0008] Preferably, running wheels are installed at both ends of the detection box, and the running wheels are rotatably installed on the left and right sides of the detection box. A shovel is connected to the front and rear ends of the detection box, and the bottom end of the shovel is flush with the top of the base.

[0009] Preferably, the digging device also includes a reciprocating block, the bottom of the reciprocating block is connected to a scraper piece, the scraper piece is V-shaped, a groove is provided at the bottom of the digging shovel, the inner wall of the groove is connected to a limiting sleeve, a first spring is connected between the two ends of the reciprocating block and the inner wall of the limiting sleeve, a first sliding sleeve is provided at the bottom of the inner wall of the detection box, the digging shovel is slidably connected to the first sliding sleeve, a fourth spring is connected to the top of the digging shovel, and the top of the fourth spring is connected to the top of the inner wall of the first sliding sleeve.

[0010] Preferably, the top of the pulley frame extends to the interior of the detection box, the bottom of the inner wall of the detection box is connected to the second sliding sleeve, the top of the pulley frame is slidingly connected to the inside of the second sliding sleeve, a second spring is connected between the top of the pulley frame and the top of the inner wall of the second sliding sleeve, the top of the inner wall of the detection box is connected to the third sliding sleeve, the top of the pulley frame is connected to the drive frame, the top of the drive frame and the top of the inner wall of the third sliding sleeve are connected via a detection spring, and the pressure sensor is installed on the top of the inner wall of the third sliding sleeve.

[0011] Preferably, both ends of the bottom of the driving frame are connected to a driving frame, the driving frame has a triangular block inside, the end of the triangular block close to the side wall of the detection box is connected to a driving rod, the side wall of the detection box is connected to a fourth sliding sleeve, the driving rod is slidably connected to the fourth sliding sleeve, the driving rod passes through the outside of the detection box, a third spring is connected between the triangular block and the fourth sliding sleeve, and when the pulley frame moves up and down, the driving frame can drive the triangular block to slide toward the side wall of the detection box.

[0012] Preferably, one end of the driving rod located outside the detection box is connected to a cleaning plate, and both ends of the cleaning plate are provided with arcs matching the walking wheel, and the inner wall of the arc area is provided with bristles, and the bristles are against the outer wall of the walking wheel.

[0013] Preferably, a marking block is connected to the bottom of the cleaning plate, and when the driving rod slides back and forth, it can drive the marking block to draw lines and marks on the surface of the substrate;

[0014] When the pulley frame moves up and down, it drives the driving frame to move up and down. When the driving frame moves up and down, it drives the driving frame to move up and down. When the driving frame moves up and down, it can drive the triangular block to slide toward the side wall of the detection box, so that the marking block can mark the surface of the base, so that the detection personnel can intuitively see the position of the pipeline settlement and facilitate the repair of the pipeline.

[0015] Preferably, a soil filling device is installed at the rear end of the detection box, and the soil filling device includes a telescopic member, one end of the telescopic member is fixed to the detection box, the other end of the telescopic member is connected to a connecting plate, the other end of the connecting plate is connected to two pull ropes, one end of the pull rope is connected to a soil filling plate, the bottom of the soil filling plate is connected to soil filling teeth, and the soil filling teeth are inserted into the interior of the base, the rear end of the detection box is fixedly connected to a fixed block, the soil filling plate is movably connected to the fixed block, and when the telescopic member drives the connecting plate and the soil filling plate to be pulled toward the detection box, the two soil filling plates are close to each other;

[0016] By setting up two symmetrical filling plates, after the detection box has detected one place, the two filling plates are moved closer to each other, so that the filling teeth at the bottom of the two filling plates are also moved closer to each other. When the two sets of symmetrically set filling teeth are closer to each other, the soil on the base can be driven to move toward the detection seam, thereby filling the detection seam. In this way, there is no need to repair the detection seam separately later, thereby improving work efficiency.

[0017] Preferably, a first connecting rod is connected between one end of the fixed block and one end of the soil-filling plate, and both ends of the first connecting rod are respectively hinged to the fixed block and the soil-filling plate through a torsion spring, a second connecting rod and a third connecting rod are connected between the other end of the fixed block and the other end of the soil-filling plate, and both ends of the second connecting rod are respectively hinged to the third connecting rod and the soil-filling plate through a torsion spring, and one end of the third connecting rod is hinged to the fixed block through a torsion spring.

[0018] Compared with the prior art, the present invention provides a pipeline settlement deformation monitoring device in subway foundation pit excavation construction, which has the following beneficial effects:

[0019] 1. The present invention installs two fixing frames on a base with pipelines, and then places the two bases and positioning slide rails in a horizontal position by observing a level meter. When testing, the test box is slid on the base, and a test gap is dug out of the base under the action of a digging shovel, and the bottom end of the digging shovel contacts the top of the pipeline. At this time, the pulley located behind the test box contacts the top of the pipeline. When a certain position of the pipeline is higher or lower, the pulley will slide up or down, thereby completing the detection of the settlement degree of the pipeline.

[0020] 2. The present invention sets a pressure sensor, a detection spring and a display screen. When the pulley drives the pulley frame to slide up and down, the top of the pulley frame drives the detection spring to compress or stretch. Finally, the pressure change of the detection spring is detected by the pressure sensor, and then the data is transmitted to the controller. The controller detects the settlement degree of the pipeline according to the pressure value of the detection spring, and finally converts the electrical signal into a digital signal and displays it on the display screen.

[0021] 3. The present invention sets two symmetrical filling plates, so that after the detection box detects one place, the two filling plates are moved closer to each other, so that the filling teeth at the bottom of the two filling plates are also moved closer to each other. When the two sets of symmetrically set filling teeth are moved closer to each other, the soil on the base can be driven to move toward the detection seam, so that the detection seam is filled, so that there is no need to repair the detection seam separately later, thereby improving work efficiency.

[0022] 4. The present invention sets a marking block. When the pulley frame moves up and down, it drives the driving frame to move up and down. When the driving frame moves up and down, it drives the driving frame to move up and down. When the driving frame moves up and down, it can drive the triangular block to slide toward the side wall of the detection box, so that the marking block can mark the surface of the base, so that the detection personnel can intuitively see the position of the pipeline settlement and facilitate the repair of the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is an overall stereogram of the present invention;

[0024] Figure 2 It is a three-dimensional diagram of the pipeline and the detection box of the present invention;

[0025] Figure 3 A side sectional view of the present invention;

[0026] Figure 4 is another side sectional view of the present invention;

[0027] Figure 5 For the present invention Figure 4 Enlarged view of point A in the middle;

[0028] Figure 6 This is a schematic diagram of the internal structure of the detection box of the present invention;

[0029] Figure 7 It is a three-dimensional exploded view of the earth-shoveling device of the present invention;

[0030] Figure 8 is a three-dimensional diagram of the soil filling device of the present invention;

[0031] Fig. 9 It is a stereoscopic diagram of the detection box and the soil filling device of the present invention.

[0032] In the figure: 100, detection box; 101, fixed frame; 102, positioning slide rail; 103, level; 104, walking wheel; 105, pulley frame; 106, pulley; 107, second sliding sleeve; 109, second spring; 110, driving frame; 111, third sliding sleeve; 112, detection spring; 113, pressure sensor; 114, controller; 115, display screen; 116, driving frame; 118, fourth sliding sleeve; 119, driving rod; 120, triangular block; 121, third spring; 122, marking block; 123, cleaning plate; 124, 4. Brush; 200. Base; 201. Detection seam; 202. Pipeline; 300. Filling device; 301. Connecting plate; 302. Telescopic member; 303. Filling plate; 304. Filling teeth; 305. First connecting rod; 306. Second connecting rod; 307. Third connecting rod; 308. Fixed block; 309. Pull rope; 400. Digging device; 401. Digging shovel; 402. Blade; 403. Groove; 404. Reciprocating block; 405. Scraper; 406. First spring; 407. Limit sleeve; 408. Fourth spring; 409. First sliding sleeve. DETAILED DESCRIPTION

[0033] See also Figure 1-9 , this embodiment discloses a pipeline settlement deformation monitoring device in subway foundation pit excavation construction, including a detection box 100 and a positioning slide rail 102, the positioning slide rail 102 is installed on a base 200, and fixed frames 101 are installed at both ends of the positioning slide rail 102. The positioning slide rail 102 is horizontally arranged, the detection box 100 is slidably connected to the positioning slide rail 102, and a level meter 103 is connected between the two fixed frames 101;

[0034] A pulley 106 is installed inside the detection box 100, and a pulley frame 105 is installed above the pulley 106. The pulley 106 is rotatably connected to the bottom of the pulley frame 105. A digging device 400 is arranged in front of the pulley 106. The digging device 400 includes a digging shovel 401. The front end of the digging shovel 401 has a cutting edge 402. The digging shovel 401 is fixed to the bottom of the detection box 100. When the detection box 100 moves forward, the digging shovel 401 digs the soil of the base 200 to form a detection gap 201 on the base 200. The detection gap 201 extends to the top of the pipeline 202 inside the base 200, so that the bottom end of the pulley 106 can contact the top surface of the pipeline 202.

[0035] The pulley frame 105 extends to the interior of the detection box 100, the top of the pulley frame 105 is connected to a detection spring 112, the top of the detection spring 112 is connected to a pressure sensor 113, a controller 114 is installed inside the detection box 100, the top of the detection box 100 is connected to a display screen 115, and the pressure sensor 113, the controller 114 and the display screen 115 are electrically connected;

[0036] By installing two fixing frames 101 on the base 200 with the pipeline 202, and then keeping the two bases 200 and the positioning slide rails 102 in a horizontal position by observing the level meter 103, when testing, the test box 100 is slid on the base 200, and the base 200 is dug out with the action of the digging shovel 401 to form a test gap 201, and the bottom end of the digging shovel 401 contacts the top of the pipeline 202. At this time, the pulley 106 located at the rear of the test box 100 contacts the top of the pipeline 202. When a certain position of the pipeline 202 When it is higher or lower, the pulley 106 will slide up or down, driving the pulley frame 105 to slide up and down, and the top of the pulley frame 105 will drive the detection spring 112 to compress or stretch, and finally the pressure change of the detection spring 112 is detected through the pressure sensor 113, and then the data is transmitted to the controller 114. The controller 114 detects the settlement degree of the pipeline 202 according to the pressure value of the detection spring 112, and finally converts the electrical signal into a digital signal and displays it on the display screen 115, thereby completing the detection of the settlement degree of the pipeline 202.

[0037] As a possible embodiment, walking wheels 104 are installed at both ends of the detection box 100, and the walking wheels 104 are rotatably installed on the left and right sides of the detection box 100. A shovel is connected to the front and rear ends of the detection box 100, and the bottom end of the shovel is flush with the top of the base 200.

[0038] As a possible embodiment, the digging device 400 also includes a reciprocating block 404, the bottom of which is connected to a scraper piece 405, the scraper piece 405 is V-shaped, a groove 403 is provided at the bottom of the digging shovel 401, the inner wall of the groove 403 is connected to a limiting sleeve 407, a first spring 406 is connected between the two ends of the reciprocating block 404 and the inner wall of the limiting sleeve 407, a first sliding sleeve 409 is provided at the bottom of the inner wall of the detection box 100, the digging shovel 401 is slidably connected to the first sliding sleeve 409, a fourth spring 408 is connected to the top of the digging shovel 401, and the top of the fourth spring 408 is connected to the top of the inner wall of the first sliding sleeve 409.

[0039] As a possible embodiment, the top of the pulley frame 105 extends to the interior of the detection box 100, the bottom of the inner wall of the detection box 100 is connected to the second sliding sleeve 107, the top of the pulley frame 105 is slidingly connected to the inside of the second sliding sleeve 107, a second spring 109 is connected between the top of the pulley frame 105 and the top of the inner wall of the second sliding sleeve 107, the top of the inner wall of the detection box 100 is connected to the third sliding sleeve 111, the top of the pulley frame 105 is connected to the drive frame 110, the top of the drive frame 110 is connected to the top of the inner wall of the third sliding sleeve 111 via a detection spring 112, and the pressure sensor 113 is installed on the top of the inner wall of the third sliding sleeve 111.

[0040] As a possible embodiment, both ends of the bottom of the driving frame 110 are connected to a driving frame 116, and a triangular block 120 is provided inside the driving frame 116. The end of the triangular block 120 close to the side wall of the detection box 100 is connected to a driving rod 119, and the side wall of the detection box 100 is connected to a fourth sliding sleeve 118. The driving rod 119 is slidably connected to the fourth sliding sleeve 118, and the driving rod 119 passes through the outside of the detection box 100. A third spring 121 is connected between the triangular block 120 and the fourth sliding sleeve 118. When the pulley frame 105 moves up and down, the driving frame 116 can drive the triangular block 120 to slide toward the side wall of the detection box 100.

[0041] As a possible embodiment, one end of the driving rod 119 located outside the detection box 100 is connected to a cleaning plate 123, and both ends of the cleaning plate 123 are provided with arcs matching the walking wheel 104, and the inner wall of the arc area is provided with bristles 124, and the bristles 124 are against the outer wall of the walking wheel 104.

[0042] As a possible embodiment, the bottom of the cleaning plate 123 is connected to a marking block 122, and when the driving rod 119 slides back and forth, it can drive the marking block 122 to draw a line mark on the surface of the substrate 200;

[0043] When the pulley frame 105 moves up and down, it drives the driving frame 110 to move up and down. When the driving frame 110 moves up and down, it drives the driving frame 116 to move up and down. When the driving frame 116 moves up and down, it can drive the triangular block 120 to slide toward the side wall of the detection box 100, so that the marking block 122 can draw lines and marks on the surface of the base 200, so that the detection personnel can intuitively see the position of the pipeline 202 settlement, which is convenient for the repair of the pipeline 202.

[0044] As a possible embodiment, a soil filling device 300 is installed at the rear end of the detection box 100, and the soil filling device 300 includes a telescopic member 302, one end of the telescopic member 302 is fixed to the detection box 100, the other end of the telescopic member 302 is connected to a connecting plate 301, the other end of the connecting plate 301 is connected to two pull ropes 309, one end of the pull rope 309 is connected to a soil filling plate 303, the bottom of the soil filling plate 303 is connected to a soil filling tooth 304, and the soil filling tooth 304 is inserted into the interior of the base 200, the rear end of the detection box 100 is fixedly connected to a fixed block 308, and the soil filling plate 303 is movably connected to the fixed block 308. When the telescopic member 302 drives the connecting plate 301 and the soil filling plate 303 to be pulled toward the detection box 100, the two soil filling plates 303 are close to each other;

[0045] By setting two symmetrical filling plates 303, after the detection box 100 detects one place, the two filling plates 303 are moved closer to each other, so that the filling teeth 304 at the bottom of the two filling plates 303 are also moved closer to each other. When the two groups of symmetrically set filling teeth 304 are moved closer to each other, the soil on the base 200 can be driven to move toward the detection gap 201, so that the detection gap 201 is filled, so that there is no need to repair the detection gap 201 separately later, thereby improving work efficiency.

[0046] As a possible embodiment, a first connecting rod 305 is connected between one end of the fixed block 308 and one end of the filling plate 303, and both ends of the first connecting rod 305 are respectively hinged to the fixed block 308 and the filling plate 303 through a torsion spring, and a second connecting rod 306 and a third connecting rod 307 are connected between the other end of the fixed block 308 and the other end of the filling plate 303, and both ends of the second connecting rod 306 are respectively hinged to the third connecting rod 307 and the filling plate 303 through a torsion spring, and one end of the third connecting rod 307 is hinged to the fixed block 308 through a torsion spring.

Claims

1. A pipeline settlement deformation monitoring device in subway foundation pit excavation construction, characterized by: It comprises a detection box (100) and a positioning slide rail (102), wherein the positioning slide rail (102) is mounted on a base (200), fixing frames (101) are mounted on both ends of the positioning slide rail (102), the positioning slide rail (102) is arranged horizontally, and the detection box (100) is slidably connected to the positioning slide rail (102); A pulley (106) is installed inside the detection box (100), a pulley frame (105) is installed above the pulley (106), the pulley (106) is rotatably connected to the bottom of the pulley frame (105), and a digging device (400) is arranged in front of the pulley (106), the digging device (400) comprises a digging shovel (401), the digging shovel (401) is fixed to the bottom of the detection box (100), when the detection box (100) moves forward, the digging shovel (401) digs the soil of the base (200), so that the base (200) forms a detection gap (201), the detection gap (201) extends to the top of the pipeline (202) inside the base (200), so that the bottom end of the pulley (106) can contact the top surface of the pipeline (202); The pulley frame (105) extends into the interior of the detection box (100); a detection spring (112) is connected to the top of the pulley frame (105); a pressure sensor (113) is connected to the top of the detection spring (112); a controller (114) is installed inside the detection box (100); a display screen (115) is connected to the top of the detection box (100); and the pressure sensor (113), the controller (114) and the display screen (115) are electrically connected; The digging device (400) further comprises a reciprocating block (404), the bottom of the reciprocating block (404) being connected to a scraping piece (405), the scraping piece (405) being in a V-shape, the bottom of the digging shovel (401) being provided with a groove (403), the inner wall of the groove (403) being connected to a limiting sleeve (407), a first spring (406) being connected between the two ends of the reciprocating block (404) and the inner wall of the limiting sleeve (407), a first sliding sleeve (409) being provided at the bottom of the inner wall of the detection box (100), the digging shovel (401) being slidably connected to the first sliding sleeve (409), a fourth spring (408) being connected to the top of the inner wall of the first sliding sleeve (409), the top of the digging shovel (401) being connected to the top of the inner wall of the first sliding sleeve (409), the top of the fourth spring (408) being connected to the top of the inner wall of the first sliding sleeve (409).

2. The pipeline settlement deformation monitoring device in subway foundation pit excavation construction according to claim 1 is characterized by: Travel wheels (104) are installed at both ends of the detection box (100), and the travel wheels (104) are rotatably installed on the left and right sides of the detection box (100). A shovel is connected to the front and rear ends of the detection box (100), and the bottom end of the shovel is flush with the top of the base (200).

3. The pipeline settlement deformation monitoring device in subway foundation pit excavation construction according to claim 2 is characterized by: The top of the pulley frame (105) extends to the interior of the detection box (100); the bottom of the inner wall of the detection box (100) is connected to a second sliding sleeve (107); the top of the pulley frame (105) is slidably connected to the interior of the second sliding sleeve (107); a second spring (109) is connected between the top of the pulley frame (105) and the top of the inner wall of the second sliding sleeve (107); the top of the inner wall of the detection box (100) is connected to a third sliding sleeve (111); the top of the pulley frame (105) is connected to a driving frame (110); the top of the driving frame (110) and the top of the inner wall of the third sliding sleeve (111) are connected via a detection spring (112); and the pressure sensor (113) is mounted on the top of the inner wall of the third sliding sleeve (111).

4. The pipeline settlement deformation monitoring device in subway foundation pit excavation construction according to claim 3 is characterized by: Both ends of the bottom of the driving frame (110) are connected to a driving frame (116), the driving frame (116) has a triangular block (120) inside, one end of the triangular block (120) close to the side wall of the detection box (100) is connected to a driving rod (119), the side wall of the detection box (100) is connected to a fourth sliding sleeve (118), the driving rod (119) is slidably connected to the fourth sliding sleeve (118), the driving rod (119) penetrates the outside of the detection box (100), a third spring (121) is connected between the triangular block (120) and the fourth sliding sleeve (118), and when the pulley frame (105) moves up and down, the driving frame (116) can drive the triangular block (120) to slide towards the side wall of the detection box (100).

5. The pipeline settlement deformation monitoring device in subway foundation pit excavation construction according to claim 4 is characterized by: One end of the driving rod (119) located outside the detection box (100) is connected to a cleaning plate (123), and arcs matching the running wheel (104) are arranged at both ends of the cleaning plate (123), and bristles (124) are arranged on the inner wall of the arc area, and the bristles (124) abut against the outer wall of the running wheel (104).

6. The pipeline settlement deformation monitoring device in subway foundation pit excavation construction according to claim 5 is characterized by: The bottom of the cleaning plate (123) is connected to a marking block (122), and when the driving rod (119) slides back and forth, it can drive the marking block (122) to draw a mark on the surface of the substrate (200).

7. The pipeline settlement deformation monitoring device in subway foundation pit excavation construction according to claim 1 is characterized by: A soil filling device (300) is installed at the rear end of the detection box (100), and the soil filling device (300) comprises a telescopic member (302), one end of the telescopic member (302) is fixed to the detection box (100), the other end of the telescopic member (302) is connected to a connecting plate (301), the other end of the connecting plate (301) is connected to two pull ropes (309), one end of the pull rope (309) is connected to a soil filling plate (303), and the soil filling plate (303) is connected to the detection box (100). The bottom of the detection box (100) is connected to a filling tooth (304), the filling tooth (304) is inserted into the interior of the base (200), the rear end of the detection box (100) is fixedly connected to a fixed block (308), the filling plate (303) is movably connected to the fixed block (308), and when the telescopic member (302) drives the connecting plate (301) and the filling plate (303) to be pulled toward the detection box (100), the two filling plates (303) are moved closer to each other.

8. The pipeline settlement deformation monitoring device in subway foundation pit excavation construction according to claim 7 is characterized by: A first connecting rod (305) is connected between one end of the fixed block (308) and one end of the earthfill plate (303); two ends of the first connecting rod (305) are respectively hinged to the fixed block (308) and the earthfill plate (303) via a torsion spring; a second connecting rod (306) and a third connecting rod (307) are connected between the other end of the fixed block (308) and the other end of the earthfill plate (303); two ends of the second connecting rod (306) are respectively hinged to the third connecting rod (307) and the earthfill plate (303) via a torsion spring; and one end of the third connecting rod (307) is hinged to the fixed block (308) via a torsion spring.

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