Shield tunnel segment structure clearance convergence monitoring method

Abstract

The invention discloses a shield tunnel segment structure clearance convergence monitoring method. A laser range finder, a range finder matched support, a laser target, a measuring platform, a channel bolt and a pre-buried channel are included. The pre-buried channel is pre-buried in a pipe piece of a tunnel, the measuring platform comprises a side arc-shaped plate, a top flat plate and an adjustable telescopic supporting rod, the side arc-shaped plate is fixedly connected to the pre-buried channel pre-buried in the pipe piece through a channel bolt, and the tail end of the top flat plate is hinged to the top end of the side arc-shaped plate; the adjustable telescopic supporting rod is installed between the top flat plate and the side arc-shaped plate, and the levelness of the top flat plate is adjusted by adjusting the length of the adjustable telescopic supporting rod. The distance measuring instrument matching support is installed on the top flat plate, the laser distance measuring instrument is installed on the distance measuring instrument matching support, and the laser target is installed on the segment on the opposite side of the laser distance measuring instrument. During working, the horizontal distance between the laser range finder and the laser target is measured, and the difference of the measurement distances at different times is the clearance convergence amount of the shield tunnel segment structure.

Description

Technical Field

[0001] The invention belongs to the technical field of tunnel monitoring, and in particular relates to a method for monitoring the clearance convergence of a shield tunnel segment structure. Background Art

[0002] As the urban ground space is insufficient, the scale of underground rail transit and cross-river tunnels is increasing, the forms of tunnel support structures are constantly being innovated, and various monitoring projects are also increasing. Among them, the clearance convergence of the segment structure is crucial to the safety control of the entire tunnel, and it is one of the conventional indicators for safety monitoring of tunnels of all levels.

[0003] The clearance convergence of the segment structure is mainly caused by the displacement of the surrounding soil into the tunnel after the shield construction segment structure support is completed, the segment structure is deformed by the water and soil pressure on the outside, and the distance between the midpoints of the waistline on both sides of the segment changes. Larger segment clearance convergence directly affects the safety of the main structure of the tunnel and the surrounding ground environment. Therefore, it is necessary to monitor the clearance convergence of the segment structure during the tunnel construction process in order to adjust the shield excavation speed and grouting volume in time.

[0004] At present, the clearance convergence monitoring of the segment structure is usually carried out by using convergence meters and total stations. The convergence meter takes a long time to measure and is complicated to operate. The total station is greatly affected by the environment and humidity in the tunnel, has high investment costs, and has the disadvantages of heavy manual load. Summary of the invention

[0005] In view of the problems of high cost and complex operation in the existing tunnel segment structure clearance convergence monitoring method, the present invention proposes a shield tunnel segment structure clearance convergence monitoring method which is easy to operate, has high measurement accuracy, low cost, and saves time and effort.

[0006] The present invention is achieved through the following technical solutions:

[0007] A shield tunnel segment structure clearance convergence monitoring method, comprising a laser rangefinder, a rangefinder supporting bracket, a laser target, a measuring platform, a channel bolt and a pre-buried channel;

[0008] The embedded groove is embedded in the tunnel segment, and the measuring platform includes a side arc plate, a top plate and an adjustable telescopic support rod. The side arc plate is fixedly connected to the embedded groove embedded in the segment by a groove bolt, the tail end of the top plate is hinged to the top end of the side arc plate by a hinge, the top end of the adjustable telescopic support rod is hinged to the top plate, and the bottom end of the adjustable telescopic support rod is hinged to the side arc plate. The horizontality of the top plate is adjusted by adjusting the length of the adjustable telescopic support rod, so as to provide a stable and horizontal installation foundation for the installation of the supporting bracket of the rangefinder;

[0009] The rangefinder supporting bracket is fixedly mounted on the top plate of the measuring platform through the connecting bolts, the laser rangefinder is mounted on the rangefinder supporting bracket, and the laser target is mounted on the pipe segment on the opposite side of the laser rangefinder;

[0010] During operation, after using the visible lens of the laser rangefinder to find the laser target, use the horizontal fine-tuning screw and vertical fine-tuning screw of the rangefinder's supporting bracket to align the centering crosshairs emitted by the laser rangefinder with the center of the laser target, and then measure the horizontal distance between the laser rangefinder and the laser target. The difference in the measured distances at different times is the clearance convergence of the shield tunnel segment structure.

[0011] In the above technical solution, the side curved plates and the top flat plate are both made of 4 mm thick steel plates, and the curvature of the side curved plates is consistent with the curvature of the pipe segments.

[0012] In the above technical solution, bolt holes corresponding to the channel bolts are arranged on the side arc-shaped plates.

[0013] In the above technical solution, the number of the adjustable telescopic support rods is preferably two, so as to ensure the strength between the side arc plate and the top flat plate.

[0014] In the above technical solution, the adjustable telescopic support rod includes a first rod and a second rod, the first rod and the second rod are arranged along the same straight line, the first rod and the second rod are connected by bolts, and the relative position of the first rod and the second rod is adjusted by adjusting the bolts, thereby adjusting the length of the entire adjustable telescopic support rod.

[0015] In the above technical solution, the channel bolts match the embedded channels in the segments. This embodiment uses M10 bolts with a bolt cap length of 20 mm and a width of 10 mm.

[0016] In the above technical solution, the laser target is a 30cm×30cm waterproof and moisture-proof coated sticker.

[0017] The advantages and beneficial effects of the present invention are:

[0018] The measuring platform used in the present invention is simple to manufacture and flexible and convenient to install, so that the measuring position of the instrument can be fixed, and it can better adapt to the complex construction environment on site; the monitoring instrument is small in size, simple to operate, with high measuring accuracy and short measuring time, and single-person measurement can be realized, thus reducing labor costs; the rangefinder is low in price, thus reducing the initial investment in instrument purchase; the monitoring data processing is simple, and the convergence change of the pipe clearance can be obtained after on-site measurement, which is conducive to timely feedback of monitoring data and has strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the clearance convergence monitoring device of the shield tunnel segment structure of the present invention.

[0020] Figure 2 This is a schematic diagram of the connection between the measuring platform and the pipe segment.

[0021] Figure 3 It is a structural diagram of the measurement platform.

[0022] Figure 4 This is a schematic diagram of the supporting bracket for the rangefinder.

[0023] Figure 5 This is a large-scale image of a laser target.

[0024] For ordinary technicians in this field, other relevant drawings can be obtained based on the above drawings without any creative work. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is further described below in conjunction with specific embodiments.

[0026] A shield tunnel segment structure clearance convergence monitoring device comprises a laser rangefinder 1, a rangefinder supporting bracket 2, a laser target 3, a measuring platform 4, a channel bolt 5 and a pre-buried channel 6.

[0027] The pre-embedded groove 6 is pre-embedded in the pipe segment 7 of the tunnel (ie, the pre-embedded groove 6 is a pre-embedded component in the pipe segment 7).

[0028] The measuring platform 4 is fixedly connected to the embedded groove 6 in the pipe segment 7 by the groove bolts 5. Specifically, the measuring platform 4 includes a side arc plate 4-1, a top plate 4-2 and an adjustable telescopic support rod 4-3. The side arc plate 4-1 and the top plate 4-2 are both made of 4mm thick steel plates. The curvature of the side arc plate 4-1 is consistent with the curvature of the pipe segment 7. In this embodiment, the curvature is 22.50°. The side arc plate 4-1 is fixedly connected to the embedded groove 6 embedded in the pipe segment 7 by the groove bolts 4-2 (the side arc plate 4-1 is provided with bolt holes corresponding to the groove bolts 4-2), so that the side arc plate 4-1 can be fixedly connected to the embedded groove 6 embedded in the pipe segment 7 by the groove bolts 4-2. The upper curved plate 4-1 is fixed on the tunnel segment 7; the tail end of the top flat plate 4-2 is hinged to the top end of the side curved plate 4-1 through a hinge 4-4, the top end of the adjustable telescopic support rod 4-3 is hinged to the top flat plate 4-2, and the bottom end of the adjustable telescopic support rod 4-3 is hinged to the side curved plate 4-1. By adjusting the length of the adjustable telescopic support rod 4-3, the horizontality of the top flat plate 4-2 can be adjusted, thereby providing a stable horizontal installation platform foundation for the subsequent installation of the rangefinder supporting bracket 2.

[0029] Furthermore, the number of the adjustable telescopic support rods 4-3 is preferably two, so as to ensure the strength between the side arc plate 4-1 and the top flat plate 4-2. Furthermore, the adjustable telescopic support rod 4-3 includes a first rod and a second rod, the first rod and the second rod are arranged along the same straight line, the first rod and the second rod are connected by bolts, and the relative position of the first rod and the second rod is adjusted by adjusting the bolts, thereby adjusting the length of the entire adjustable telescopic support rod 4-3.

[0030] A pair of connecting bolts 4 - 5 are provided on the top plate 4 - 2 of the measuring platform 4 , and the rangefinder supporting bracket 2 is fixedly mounted on the top plate 4 - 2 of the measuring platform 4 through the connecting bolts 4 - 5 .

[0031] The laser rangefinder 1 is a high-precision measuring instrument with an accuracy of ±1 mm / 100 m. The laser rangefinder 1 is mounted on a rangefinder supporting bracket 2 , and the rangefinder supporting bracket 2 can fine-tune the horizontal and vertical directions of the laser rangefinder 1 .

[0032] The laser target 3 is adhered to the waistline of the pipe segment 7 on the opposite side of the laser rangefinder 1 by means of nail-free glue, and the adhering position is preferably on the same horizontal plane as the measuring line of the laser rangefinder 1 .

[0033] During operation, after finding the laser target 3 with the visible lens of the laser rangefinder 1, align the centering crosshairs emitted by the laser rangefinder 1 with the center of the laser target 3 using the horizontal fine-tuning screw 2-2 and the vertical fine-tuning screw 2-3 of the rangefinder supporting bracket 2, and then measure the horizontal distance between the laser rangefinder 1 and the laser target 3. The difference in the measured distances at different times is the clearance convergence amount of the shield tunnel segment structure.

[0034] Furthermore, the groove bolt 5 matches the embedded groove 6 in the pipe segment 7. This embodiment uses M10 bolts with a bolt cap of 20 mm in length and 10 mm in width. The laser target 3 is a 30 cm × 30 cm waterproof and moisture-proof film sticker. The rangefinder supporting bracket 2 is an existing conventional product.

[0035] The present invention is described above by way of example. It should be noted that, without departing from the core of the present invention, any simple deformation, modification or other equivalent replacement that can be made by those skilled in the art without inventive effort falls within the protection scope of the present invention.

Claims

1. A shield tunnel segment structure clearance convergence monitoring method, characterized by: It includes a laser rangefinder, a rangefinder supporting bracket, a laser target, a measuring platform, channel bolts and a pre-buried channel; The embedded groove is embedded in the tunnel segment, and the measuring platform includes a side arc plate, a top plate and an adjustable telescopic support rod. The side arc plate is fixedly connected to the embedded groove embedded in the segment by a groove bolt, the tail end of the top plate is hinged to the top end of the side arc plate by a hinge, the top end of the adjustable telescopic support rod is hinged to the top plate, and the bottom end of the adjustable telescopic support rod is hinged to the side arc plate. The horizontality of the top plate is adjusted by adjusting the length of the adjustable telescopic support rod, so as to provide a stable and horizontal installation foundation for the installation of the supporting bracket of the rangefinder; The rangefinder supporting bracket is fixedly mounted on the top plate of the measuring platform through the connecting bolts, the laser rangefinder is mounted on the rangefinder supporting bracket, and the laser target is mounted on the pipe segment on the opposite side of the laser rangefinder; After finding the laser target with the visible lens of the laser rangefinder, use the horizontal fine-tuning screw and vertical fine-tuning screw of the rangefinder's supporting bracket to align the centering crosshairs emitted by the laser rangefinder with the center of the laser target, and then measure the horizontal distance between the laser rangefinder and the laser target. The difference in the measured distance at different times is the clearance convergence of the shield tunnel segment structure.

2. The shield tunnel segment structure clearance convergence monitoring method according to claim 1 is characterized by: The side curved plates and top flat plates are both made of 4mm thick steel plates, and the curvature of the side curved plates is consistent with the curvature of the pipe segments.

3. The shield tunnel segment structure clearance convergence monitoring method according to claim 1 is characterized by: Bolt holes corresponding to the channel bolts are arranged on the side arc-shaped plates.

4. The shield tunnel segment structure clearance convergence monitoring method according to claim 1 is characterized by: The number of the adjustable telescopic support rods is preferably two.

5. The shield tunnel segment structure clearance convergence monitoring method according to claim 1 is characterized by: The adjustable telescopic support rod comprises a first rod and a second rod, the first rod and the second rod are arranged along the same straight line, and the first rod and the second rod are connected by bolts.

6. The shield tunnel segment structure clearance convergence monitoring method according to claim 1 is characterized by: The groove bolts match the pre-buried grooves in the pipe segments.

7. The shield tunnel segment structure clearance convergence monitoring method according to claim 1 is characterized by: The laser target is a 30cm×30cm waterproof and moisture-proof film-coated sticker.

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