Shield tunnel segment circumferential grouting effect detection device

Abstract

The utility model relates to the technical field of shield tunnel engineering detection, in particular to a shield tunnel segment circumferential grouting effect detection device. Comprising an assembled annular sliding rail fixed on the inner surface of a tunnel segment, and the assembled annular sliding rail is formed by continuously splicing a plurality of sections of I-shaped steel arranged in the annular direction of the tunnel segment; an electric rail car is arranged on the assembly type circumferential sliding rail, and the electric rail car does circumferential motion along the assembly type circumferential sliding rail; and a ground penetrating radar detection system is fixed on the electric rail car. The grouting effect detection device can accurately detect the grouting effect within the range of 0-360 degrees, is flexible to use, can automatically detect the grouting effect, and is flexible to use.

Description

Technical Field

[0001] The utility model relates to the technical field of shield tunnel engineering detection, in particular to a device for detecting the circumferential grouting effect and voids behind the segment during the tunneling process of a shield tunnel. Background Technique

[0002] During the construction of a shield tunneling method, circumferential grouting (synchronous grouting) behind the segment is a key link in tunnel construction. Synchronous grouting is to fill the shield tail gap with grout during the tunneling process of the shield machine. The grout load supports the surrounding rock mass of the segment, preventing the soil above the shield tail from collapsing, thereby effectively controlling the formation deformation and the attitude of the shield machine, improving the quality of tunnel assembly, and ensuring the stability of the tunnel structure. With the development of shield tunnel engineering towards "large diameter" and "long distance", etc., the problem of controlling the grouting effect of long tunnels has gradually emerged. If the parameters such as the grouting volume and grouting pressure are set unreasonably, it will lead to poor filling effect of the grouting behind the tunnel segment, voids appear, and the overall stability of the tunnel structure is reduced. Therefore, the detection of the grouting effect behind the segment is a key step in shield tunnel construction, and the grouting effect determines whether to carry out secondary grouting or compensatory grouting, thereby effectively reducing the ground settlement and segment structure deformation caused by tunnel construction.

[0003] At present, the methods for detecting the synchronous grouting effect of shield tunnels at home and abroad mainly include the analytical method, the inspection hole method, and the ground penetrating radar method. Among them, as an efficient non-destructive detection means, the ground penetrating radar technology uses non-grounding measurement, can perform fast and continuous detection, and can more intuitively display the detection target, and is widely used in the non-destructive detection field of the grouting effect behind the segment of soft soil shield tunnels. For example, during the construction of the Shanghai Yangtze River Tunnel Project, the ground penetrating radar was used to detect the distribution pattern of the grouting liquid along the circumferential and longitudinal directions of the tunnel and whether there are voids between the segment and the soil behind the wall.

[0004] The ground penetrating radar system includes a host tablet, an antenna box, and an external cable. In the actual tunnel engineering detection, multiple operators need to hold the host tablet and the antenna box by hand and stand on the shield machine assembly frame, closely attach the bottom of the antenna box to the surface of the tunnel segment, and scan around the tunnel circumferentially for one week. The detection process is complicated and the operation efficiency is low; at the same time, due to the scattered sealing grease on the assembly frame and the wet ground, it brings great hidden dangers to the personal safety of the operators; in addition, the space on the shield machine assembly frame is narrow, the ground penetrating radar system has many components, and it is necessary to hold the equipment by hand for a long time on the segment surface, resulting in limited detection positions of the segment, poor detection effect, and lack of flexibility. Content of the Utility Model

[0005] The purpose of the present utility model is to overcome the above-mentioned defects of the prior art and propose a shield tunnel segment circumferential grouting effect detection device, which can accurately realize the detection of grouting effect within the range of 0-360°, is flexible to use, and can realize automatic detection of grouting effect, and is flexible to use.

[0006] The technical solution of the utility model is: a device for detecting the effect of circumferential grouting of a shield tunnel segment, which comprises an assembled circumferential slide rail fixed on the inner surface of the tunnel segment, the assembled circumferential slide rail being formed by continuously splicing together a plurality of I-steel sections arranged along the circumference of the tunnel segment;

[0007] An electric rail car is provided on the assembled circular slide rail, and the electric rail car performs circular motion along the assembled circular slide rail;

[0008] A ground penetrating radar detection system is fixed on the electric rail car.

[0009] In the utility model, the electric rail vehicle comprises a vehicle body, and a plurality of rollers are respectively provided on both sides of the assembled circular slide rail, and the rollers on both sides are symmetrically arranged;

[0010] The roller is arranged in a horizontal direction and is rotatably arranged in the slide groove of the I-beam;

[0011] A driving motor is provided on the vehicle body, and the driving motor drives the roller to rotate in the slide groove.

[0012] The vehicle body is also provided with a servo controller and a sensor, and the servo controller is electrically connected to the drive motor and the sensor respectively;

[0013] One end of the vehicle body that is away from the moving direction thereof is fixedly connected to the rear hanging steel plate, and the ground penetrating radar detection system is fixed on the rear hanging steel plate.

[0014] The ground penetrating radar detection system comprises a host flat panel, an antenna box and an external cable. The ground penetrating radar detection system is fixed on a rear hanging steel plate through a flexible rubber belt.

[0015] The two ends of the flexible rubber belt are fixed on the rear hanging steel plate, and the ground penetrating radar detection system is fixed between the flexible rubber belt and the rear hanging steel plate through the elastic force of the flexible rubber belt itself.

[0016] The beneficial effects of the utility model are:

[0017] (1) In this application, an electric rail car is placed on an assembled circumferential slide rail. Under the control of a drive motor, a servo controller and a sensor, the electric rail car drives the ground penetrating radar detection system to perform uniform circular motion along the circumference of the tunnel segment, thereby realizing the detection of the grouting effect within a range of 0-360°. Moreover, the detection work can be completed automatically without manual operation, and the use is flexible;

[0018] (2) The servo controller can accurately control the speed, steering, and torque of the driving motor, improving the detection quality of the ground penetrating radar for the post-grouting effect behind the tunnel segment.

[0019] (3) In this application, the detection frequency range of the antenna box in the ground penetrating radar detection system is between 100 MHz and 1500 MHz, which can effectively improve the post-grouting effect and detection accuracy behind the tunnel segment under various adverse geological conditions.

[0020] (4) The assembled circumferential slide rail is fixed on the inner surface of the tunnel segment by modified epoxy resin, which is convenient to disassemble and is suitable for the detection of the post-grouting effect behind the shield tunnel under various adverse geological conditions.

[0021] (5) Through the flexible rubber band, the antenna boxes with different frequencies can be fixed on the rear hanging steel plate of the electric rail vehicle, making the antenna box closely attached to the surface of the tunnel segment, improving the detection quality of the post-grouting and the stability of the radar reflection wave.

[0022] (6) The mainframe tablet of the ground penetrating radar detection system can monitor the diffusion state of the slurry behind the segment in real time. By the self-calibrated radar detection parameters, including dielectric constant, wave velocity, time window and other parameters, the degree of real-time automatic image processing is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic installation structure diagram of the detection device described in the present utility model;

[0024] Figure 2 is a schematic structure diagram of the assembled reversing slide rail;

[0025] Figure 3 is a schematic structure diagram of the electric rail vehicle;

[0026] Figure 4 is a schematic structure diagram of the flexible rubber band;

[0027] Figure 5 is a schematic structure diagram of the antenna box;

[0028] Figure 6 is a schematic diagram of the measuring line layout of the tunnel segment provided in Embodiment 1;

[0029] Figure 7 is a radar detection profile of Point B2423 in Embodiment 1;

[0030] Figure 8 is a radar detection profile of Point B2424 in Embodiment 1;

[0031] Figure 9 is a radar detection profile of Point B2425 in Embodiment 1.

[0032] In the figure: 1 assembled circumferential slide rail; 101 I-beam; 2 ground penetrating radar detection system; 3 antenna box; 4 flexible rubber band; 5 electric rail vehicle; 6 vehicle body; 7 sensor; 8 drive motor; 9 rear hanging steel plate; 10 servo controller; 11 roller; 12 tunnel segment. Specific embodiments

[0033] In order to make the above objects, features and advantages of the present utility model more obvious and understandable, the specific embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

[0034] In the following description, specific details are set forth in order to provide a thorough understanding of the present utility model. However, the present utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0035] As Figure 1 shown, the circumferential grouting effect detection device for shield tunnel segments of the present utility model includes an assembled circumferential slide rail 1 fixed to the inner side of the tunnel segment ring, and an electric rail vehicle 5 arranged on the slide rail. The ground penetrating radar detection system 2 is installed on the electric rail vehicle 5. During the process of the electric rail vehicle 5 sliding along the assembled circumferential slide rail 1 and driving the ground penetrating radar detection system 2 to move along the tunnel circumference, the detection of the grouting effect is realized.

[0036] As Figure 2 shown, the assembled circumferential slide rail 1 in the present application includes several sections of I-beams 101. The I-beams 101 are continuously laid along the tunnel circumference, and the ends of adjacent two I-beams are assembled and connected through modified epoxy resin, thus forming a complete and closed-loop assembled circumferential slide rail 1. The gap between the I-beam 101 and the tunnel segment 12 is filled with assembled modified epoxy resin. Therefore, the circumferential slide rail 1 is fixedly adhered to the inner surface of the tunnel segment 12 through the modified epoxy resin. In this embodiment, the assembled circumferential slide rail 1 is made of aluminum alloy, and has the characteristics of light weight, high strength, corrosion resistance, etc.

[0037] As Figure 3 shown, the electric rail vehicle 5 includes a vehicle body 6 in the shape of a flat plate. Rollers 11 are respectively arranged on both sides of the vehicle body 6 along the circumference of the assembled circumferential slide rail, and the rollers between the two sides are symmetrically arranged. In this embodiment, two rollers 11 are arranged on each side of the vehicle body 6, and the rollers on both sides are symmetrically arranged. The rollers 11 are arranged in the horizontal direction so that the rollers 11 can roll in the chute on the I-beam 101. During the process of the rollers rolling along the chute, it can ensure that the ground penetrating radar detection system 2 arranged on the electric rail vehicle 5 can be closer to the inner surface of the tunnel segment 12, improving the quality of the backfill grouting detection and the stability of the radar reflection wave.

[0038] A driving motor 8, a servo controller 10 and a sensor 7 are provided on the vehicle body 6. The driving motor 8 is connected to the roller 11. The driving motor 8 converts electrical energy into mechanical energy through an external power supply, thereby driving the roller 11 to roll in the chute, so as to realize the circumferential movement of the entire electric rail vehicle 5 along the assembled circumferential slide rail 1. During the circumferential movement of the electric rail vehicle 5, the ground penetrating radar detection system 2 is realized to perform a circular motion along the circumferential track 1, and the detection of the grouting effect within the range of 0-360° is realized. The servo controller 10 precisely controls the speed, steering and torque of the driving motor by adjusting parameters such as the voltage, current and frequency output by the external power supply. The sensor 7 is used to detect the operating states such as the rotational speed, position and temperature of the driving motor, and feeds back the temperature to the servo controller 10, thereby forming a closed-loop control of the driving motor 8.

[0039] A rear hanging steel plate 9 is fixed at the end of the vehicle body opposite to the moving direction of the electric rail vehicle. The ground penetrating radar detection system 2 is fixed on the rear hanging steel plate 9. In this embodiment, the rear hanging steel plate 9 is fixedly connected to the vehicle body 6 by bolts. That is to say, relative to the moving direction of the electric rail vehicle, the ground penetrating radar detection system 2 is connected behind the electric rail vehicle.

[0040] The ground penetrating radar detection system 2 includes a mainframe plate, an antenna box 3 and an external cable. The mainframe plate is responsible for the processing of transmitting and receiving electromagnetic wave signals, the storage and control of electromagnetic wave signal data, etc. The detection frequency of the antenna box includes 100-1500 MHz. The main function is to transmit high-frequency electromagnetic waves to the ground through the transmitting antenna, so as to detect the spatial position, structure, shape and burial depth of underground media.

[0041] In this embodiment, the ground penetrating radar detection system 2 is fixed on the rear hanging steel plate 9 through a flexible rubber band 4. Both ends of the flexible rubber band 4 are fixedly connected to the rear hanging steel plate 9. By using the elasticity of the flexible rubber band 4 itself, the mainframe plate and the antenna box 3 are fixed between the flexible rubber band 4 and the rear hanging steel plate 9. The electric rail vehicle equipped with the antenna box 3 performs a circular motion along the tunnel circumference, so as to detect the diffusion form of the slurry behind the tunnel segment wall and the grouting effect.

[0042] When using this device for detection, first, the I-beams 101 are laid along the circumference of the tunnel. The joints between adjacent two I-beams are assembled and connected through modified epoxy resin, and the gap between the I-beams 101 and the tunnel segment 12 is filled with modified epoxy resin. After the laying of the I-beams is completed, the assembled circumferential slide rail 1 fixed on the surface of the tunnel segment is formed.

[0043] Install the electric rail vehicle 5 with the ground penetrating radar detection system 2 fixed thereon on the assembled circumferential slide rail 1, and place the rollers 11 on both sides of the electric rail vehicle 5 in the chute of the assembled circumferential slide rail 1. Driven by an external power supply, the drive motor 8 operates and drives the rollers 11 to roll in the chute, thereby driving the electric rail vehicle 5 and the ground penetrating radar detection system 2 to perform a circumferential circular motion along the assembled circumferential slide rail 1. During the movement of the ground penetrating radar detection system 2, it can detect the diffusion form of the slurry behind the tunnel segment and the grouting effect.

[0044] The device described in this application has been applied to the tunnel engineering site. As Figure 6 shown, in the tunnel section from the Airport New City Station to the Airport Station of Xi'an Rail Transit Line 14, this device is used to detect whether there are voids behind the tunnel segments and the grouting filling and sealing conditions behind the segments. Figure 7 Figure 7 is the radar detection profile of Point B2423 detected by this device; Figure 8 Figure 8 is the radar detection profile of Point B2424 detected by this device; Figure 9 Figure 9 is the radar detection profile of Point B2425 detected by this device. Through Figures 7 to 9 explanation, the device proposed in this application can obtain relatively accurate detection results.

[0045] The above has introduced in detail the device for detecting the circumferential grouting effect of the shield tunnel segment provided by the present utility model. Specific examples are used in this article to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and modifications can still be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model. The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to these embodiments shown in this article, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for detecting the circumferential grouting effect of shield tunnel segments, characterized in that, It includes an assembled annular slide rail fixed on the inner surface of the tunnel segment, and the assembled annular slide rail is formed by continuously splicing several sections of I-beams arranged along the annular direction of the tunnel segment; An electric rail car is provided on the assembled circular slide rail, and the electric rail car performs circular motion along the assembled circular slide rail; A ground penetrating radar detection system is fixed on the electric rail car.

2. The segment circumferential grouting effect detection device according to claim 1, characterized in that The electric rail car comprises a car body, and a plurality of rollers are respectively provided on both sides of the car body along the assembled circular slide rail, and the rollers on both sides are symmetrically arranged; The roller is arranged in a horizontal direction and is rotatably arranged in the slide groove of the I-beam; A driving motor is provided on the vehicle body, and the driving motor drives the roller to rotate in the slide groove.

3. The circumferential grouting effect detection device for segment of shield tunnel according to claim 2, wherein The vehicle body is also provided with a servo controller and a sensor, and the servo controller is electrically connected to the drive motor and the sensor respectively; One end of the vehicle body that is away from the moving direction is fixedly connected to the rear hanging steel plate, and the ground penetrating radar detection system is fixed on the rear hanging steel plate.

4. The circumferential grouting effect detection device for segment of shield tunnel according to claim 3, characterized in that, The ground penetrating radar detection system comprises a host flat panel, an antenna box and an external cable. The ground penetrating radar detection system is fixed on a rear hanging steel plate through a flexible rubber belt.

5. The circumferential grouting effect detection device for segment of shield tunnel according to claim 4, wherein The two ends of the flexible rubber belt are fixed on the rear hanging steel plate, and the ground penetrating radar detection system is fixed between the flexible rubber belt and the rear hanging steel plate through the elastic force of the flexible rubber belt itself.

Images