Shield tail gap on-line measuring system

Abstract

The utility model belongs to the technical field of shield construction, and particularly relates to a shield tail gap online measuring system. The shield tail gap online measuring system comprises a laser distance measuring sensor, a control box and an industrial personal computer, the laser distance measuring sensor is connected with the control box through a signal cable, the control box is connected with the industrial personal computer through a signal cable, and the laser distance measuring sensor is installed on a segment assembling machine. The laser distance measuring sensor is used for detecting the distance between the laser distance measuring sensor and the inner side wall of the shield tail, the laser distance measuring sensor is also used for detecting the distance between the laser distance measuring sensor and the inner side wall of the duct piece, and the laser distance measuring sensor is used for sending detection data to the industrial personal computer. The laser distance measuring sensor is installed on the duct piece assembling machine, the laser distance measuring sensor can be used for measuring the inner side wall of the shield tail and the inner side wall of the duct piece for multiple times in real time, the industrial personal computer is used for calculating the shield tail gap value, and workers can conveniently know the moving postures of the shield tunneling machine and the duct piece in the tunneling process in real time.

Description

Technical Field

[0001] The utility model belongs to the technical field of shield construction, and particularly relates to an on-line measurement system for shield tail clearance. Background Technique

[0002] Shield machines are widely used in applications such as subway tunnels, underground pipe galleries, water supply plants, and coal mining. They are deeply loved by construction enterprises for their high efficiency, economy, and low equipment failure rate. During the tunneling construction of a shield machine, after each ring of tunneling is completed, a ring of segment needs to be assembled for support. Generally, the longitudinal width of a ring of segment is 1500 mm, and a large number of segments are required to connect a tunnel. The shield tail clearance refers to the clearance between the shield tail and the segment. If the clearance is too small, the shield tail will interfere with the segment during the propulsion process of the shield machine. In the light case, it will increase the resistance of the shield machine to move forward and reduce the tunneling speed. In the heavy case, the shield tail will damage the segment, causing tunnel water leakage or ground settlement. Therefore, the shield tail clearance data is related to the segment selection of the tunnel, the segment assembly quality, and the overall tunnel safety system.

[0003] However, at present, the measurement of the shield tail clearance of shield machines is all manual measurement. On-site measurement personnel use a steel ruler or a steel tape measure to measure in the middle section or at the end of each ring of tunneling of the shield machine. For manual measurement, on the one hand, it is difficult to ensure the accuracy of the measurement, and on the other hand, it is difficult to perform real-time measurement. Therefore, it is necessary to design an on-line measurement system for shield tail clearance to solve the above problems. Summary of the Utility Model

[0004] In view of the above problems, the utility model provides an on-line measurement system for shield tail clearance to solve the problems put forward in the above background technique.

[0005] To achieve the above object, the utility model provides the following technical solution: An on-line measurement system for shield tail clearance is applied to a shield machine. The shield machine includes a shield tail, a segment, and a segment erector. The shield tail and the segment are both arranged in a cylindrical structure. The segment erector is located inside the segment, and the segment is located inside the shield tail. The on-line measurement system for shield tail clearance includes a laser distance sensor, a control box, and an industrial control computer. The laser distance sensor is connected to the control box through a signal cable, and the control box is connected to the industrial control computer through a signal cable. The laser distance sensor is installed on the segment erector. The laser distance sensor is used to detect the distance between the laser distance sensor and the inner wall of the shield tail, and the laser distance sensor is also used to detect the distance between the laser distance sensor and the inner wall of the segment. The laser distance sensor is used to send the detected data to the industrial control computer.

[0006] Further, 6 groups of laser distance sensors are provided, and the 6 groups of laser distance sensors are circumferentially distributed on the segment erector.

[0007] Further, the industrial control computer is installed in the central control room of the shield machine.

[0008] Further, a PLC program is installed in the industrial control computer, and the PLC program is used to calculate the detected data.

[0009] Further, a display screen is installed on the industrial control computer, and the display screen is used to display the gap between the shield tail and the segment.

[0010] The technical effects and advantages of the present utility model:

[0011] 1. By installing a laser ranging sensor on the segment erector, the inner wall of the shield tail and the inner wall of the segment can be measured in real time multiple times by using the laser ranging sensor, and the shield tail gap value can be calculated by using the industrial control computer, which is convenient for the staff to understand the movement postures of the shield machine and the segment in real time during the tunneling process.

[0012] 2. By using the laser ranging sensor for detection, the influence of human factors can be reduced, and the measured data can be prevented from being affected by factors such as the proficiency of the measuring personnel, the accuracy of the measured value read by the measuring personnel, and the wear and error of the tools used for measurement, which is beneficial to obtaining a relatively accurate shield tail gap value.

[0013] 3. By using the laser ranging sensor for detection, the accuracy of the measurement can be guaranteed, thereby ensuring the accuracy of the shield tail gap value, avoiding the wrong selection of segments and the misalignment phenomenon during the segment assembly process, and thus ensuring the safety of the overall tunnel construction.

[0014] Other features and advantages of the present utility model will be described in the subsequent description, and some of them will be obvious from the description or understood by implementing the present utility model. The objectives and other advantages of the present utility model can be realized and obtained through the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 The structural schematic diagram of the on-line shield tail gap measurement system according to the embodiment of the present utility model is shown;

[0017] Figure 2 The structural schematic diagram of another perspective of the on-line shield tail gap measurement system according to the embodiment of the present utility model is shown.

[0018] Reference numerals: 1, tail shield; 2, segment; 3, segment erector; 4, laser distance sensor. Detailed implementation mode

[0019] In order to make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0020] As Figure 1 and Figure 2 shown, an on-line tail shield clearance measurement system according to an embodiment of the present utility model is applied to a shield machine. The shield machine includes a tail shield 1, segments 2 and a segment erector 3. The tail shield 1 and the segments 2 are both arranged in a cylindrical structure. The segment erector 3 is located inside the segments 2, and the segments 2 are located inside the tail shield 1. The on-line tail shield clearance measurement system includes a laser distance sensor 4, a control box and an industrial control computer. The laser distance sensor 4 is connected to the control box through a signal cable, and the control box is connected to the industrial control computer through a signal cable. The laser distance sensor 4 is installed on the segment erector 3. The laser distance sensor 4 is used to detect the distance between the laser distance sensor 4 and the inner wall of the tail shield 1, and the laser distance sensor 4 is also used to detect the distance between the laser distance sensor 4 and the inner wall of the segments 2. The laser distance sensor 4 is used to send the detected data to the industrial control computer.

[0021] Specifically, the detected data includes the distance between the laser distance sensor 4 and the inner wall of the tail shield 1, and the distance between the laser distance sensor 4 and the inner wall of the segments 2.

[0022] In this embodiment, by arranging a laser distance sensor 4 on the segment erector 3, the control box is used to control the opening and closing of the laser distance sensor 4. The laser distance sensor 4 is used to detect the distance between the laser distance sensor 4 and the inner wall of the tail shield 1, and the laser distance sensor 4 is also used to detect the distance between the laser distance sensor 4 and the inner wall of the segments 2. By transmitting the detected data to the industrial control computer, the industrial control computer performs automatic calculation, and through the calculation formula: G = L1 - L2 - t, where G is the tail shield clearance value, L1 is the distance between the laser distance sensor 4 and the inside of the tail shield 1, L2 is the distance between the laser distance sensor 4 and the inside of the segments 2, and t is the thickness of the segments 2, the tail shield clearance value is obtained.

[0023] Thus, by installing a laser distance sensor 4 on the segment erector 3, the inner wall of the shield tail 1 and the inner wall of the segment 2 can be measured in real time multiple times using the laser distance sensor 4, and the shield tail clearance value can be calculated using an industrial control computer, which facilitates the staff to understand the movement postures of the shield machine and the segment 2 in real time during tunneling.

[0024] Secondly, using the laser distance sensor 4 for detection can reduce the influence of human factors and avoid the measurement data being affected by factors such as the proficiency of the measurement personnel, the accuracy of the measurement personnel in reading values, and the wear and error of the tools used in the measurement, which is conducive to obtaining a relatively accurate shield tail clearance value and facilitating the staff to make accurate judgments.

[0025] In addition, using the laser distance sensor 4 for detection can ensure the accuracy of the measurement, thereby ensuring the accuracy of the shield tail clearance value, avoiding incorrect selection of the segment 2 and the misalignment phenomenon during the segment 2 assembly process, and thus ensuring the safety of the overall tunnel construction.

[0026] Optionally, as Figure 1 and Figure 2 shown, six groups of the laser distance sensors 4 are provided, and the six groups of the laser distance sensors 4 are circumferentially distributed on the segment erector 3.

[0027] In this embodiment, in the manual measurement chamber, there is a need for a safe standing position for the measurement personnel at the measurement points. However, at angles such as 45° and 135° of the segment 2 where there is no safe standing position for the staff, the points at these angles cannot be measured. By circumferentially distributing the six groups of laser distance sensors 4 on the segment erector 3, specifically, the six groups of laser distance sensors 4 can correspond to angular positions such as 45° and 135°, which facilitates the measurement of each angular position of the shield tail 1 and the segment 2.

[0028] Optionally, the industrial control computer is installed in the central control room of the shield machine.

[0029] In this embodiment, by setting the industrial control computer in the central control room of the shield machine, it is conducive to integrating the device for controlling the advancement of the shield machine in the central control room with the industrial control computer, which facilitates the assembly of the industrial control computer.

[0030] Optionally, a PLC program is installed in the industrial control computer, and the PLC program is used to calculate the detection data.

[0031] In this embodiment, by setting the PLC program to calculate the data sent by the laser distance sensor 4, it is conducive to quickly obtaining the shield tail clearance value.

[0032] Optionally, a display screen is installed on the industrial control computer, and the display screen is used to display the clearance between the shield tail 1 and the segment 2.

[0033] In this embodiment, the system power supply is started; the laser distance sensor 4 is started through the control box for measurement; 6 sets of distance sensors perform real-time distance detection on the inner wall of the shield tail 1. The system identifies this set of data as the inner wall detection data of the shield tail 1 and displays the inner wall detection data of the shield tail 1 through the display screen. The system collects data every 5 minutes and saves it; when segment 2 is assembled, 6 sets of distance sensors perform real-time distance detection on the inner wall of segment 2. The system identifies this set of data as the inner wall detection data of segment 2 and displays the inner wall detection data of segment 2 through the display screen. The system collects data every 5 minutes and saves it; in each action cycle, the inner wall detection data of the shield tail 1 and the inner wall detection data of segment 2 are brought into the calculation formula through the PLC program: G = L1 - L2 - t, where G is the shield tail clearance value, L1 is the distance between the laser distance sensor 4 and the inner wall of the shield tail 1, L2 is the distance between the laser distance sensor 4 and the inner wall of segment 2, and t is the thickness of segment 2, to obtain the shield tail clearance value, and at the same time, the maximum, minimum, and average values of the 6 sets of detection points are displayed.

[0034] Secondly, all records can also be retrieved for viewing and copying through data query in the task file on the display screen interface.

[0035] Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A shield tail gap online measurement system, applied to a shield machine, the shield machine comprising a shield tail (1), a pipe segment (2) and a pipe segment assembly machine (3), the shield tail (1) and the pipe segment (2) are both configured as cylindrical structures, the pipe segment assembly machine (3) is located on the inner side of the pipe segment (2), and the pipe segment (2) is located on the inner side of the shield tail (1), characterized in that: The invention comprises a laser distance measuring sensor (4), a control box and an industrial computer, wherein the laser distance measuring sensor (4) is connected to the control box via a signal cable, the control box is connected to the industrial computer via a signal cable, the laser distance measuring sensor (4) is installed on the segment assembly machine (3), the laser distance measuring sensor (4) is used to detect the distance between the laser distance measuring sensor (4) and the inner wall of the shield tail (1), the laser distance measuring sensor (4) is also used to detect the distance between the laser distance measuring sensor (4) and the inner wall of the segment (2), and the laser distance measuring sensor (4) is used to send the detection data to the industrial computer.

2. The shield tail gap online measurement system according to claim 1 is characterized in that: Six groups of the laser distance measuring sensors (4) are provided, and the six groups of the laser distance measuring sensors (4) are distributed circumferentially on the segment assembly machine (3).

3. The shield tail gap online measurement system according to claim 2 is characterized in that: The industrial computer is installed in the central control room of the shield machine.

4. The shield tail gap online measurement system according to claim 3 is characterized in that: A PLC program is installed in the industrial computer, and the PLC program is used to calculate the detection data.

5. The shield tail gap online measurement system according to claim 3 is characterized in that: A display screen is installed on the industrial computer, and the display screen is used to display the gap between the shield tail (1) and the pipe segment (2).

Images