Shield tunnel segment wall back grouting real-time detection device

Abstract

The utility model discloses a shield tunnel segment wall back grouting real-time detection device which is arranged at the shield tail of a shield tunneling machine, two construction platforms are symmetrically arranged in the shield tunneling machine, and the shield tunnel segment wall back grouting real-time detection device comprises an annular track which is movably installed between the two construction platforms in the tunneling direction of the shield tunneling machine. The circular track has an arc consistent with the radian of the outer wall of the duct piece; the sound wave detector is arranged on the outer side of the annular track in a reciprocating motion mode along the annular track, and the height of the sound wave detector can be adjusted in the radial direction of the duct piece; according to the grouting plumpness detection device, the grouting plumpness on a propagation path is reflected by utilizing the propagation speed of the sound waves in different media and the frequency change of the waves, the grouting plumpness can be detected in real time along with tunneling of a shield, and the grouting plumpness can be accurately detected. And a certain popularization value is achieved.

Description

Technical Field

[0001] This utility model relates to the field of tunnel engineering construction technology, and in particular to a real-time detection device for grouting behind shield tunnel segments. Background Technology

[0002] Because the excavation diameter of the tunnel boring machine (TBM) cutterhead is larger than the outer diameter of the tunnel segments, after the segments are assembled and removed from the tail of the shield, an annular gap is formed between the segments and the soil, known as the over-excavation gap. If the over-excavation gap is not filled in time, it will inevitably cause ground deformation, leading to settlement of adjacent surface buildings and structures or displacement of the tunnel itself. Filling the over-excavation gap and preventing significant ground deformation caused by its existence is one of the most important purposes of tail grouting. Therefore, synchronous grouting is an indispensable and crucial auxiliary method in shield tunneling. However, during the process of synchronous grouting to fill the over-excavation gap, the grout produced can cause a series of problems, such as uneven stress on the tunnel segments, incomplete filling of the gap, grout solidification shrinkage, grout cross-contamination, and groundwater dilution, all of which can significantly affect the tunnel axis and tunnel quality.

[0003] To address the issues of insufficient or poor-quality grouting behind tunnel segments in shield tunnels, researchers have proposed a method using ground-penetrating radar (GPR) technology. GPR is a non-destructive testing method capable of measuring the location, shape, and characteristics of various underground objects. During the installation of shield tunnel segments, GPR can quickly and accurately detect the grouting status behind the segment walls by scanning them. If insufficient or poor-quality grouting is detected, construction personnel can take timely measures to ensure the quality and safety of the segment walls. However, this method using GPR technology has drawbacks: poor applicability; high manpower requirements for grouting inspection behind tunnel walls; difficulty in controlling grout fullness; and slow efficiency and long processing time. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a real-time detection device for grouting behind the tunnel lining segments, thereby improving the quality and efficiency of grouting construction.

[0005] To achieve the above technical effects, this utility model provides a real-time detection device for grouting behind tunnel segments, located at the tail of the tunnel boring machine (TBM). Two construction platforms are symmetrically arranged inside the TBM. The real-time detection device for grouting behind tunnel segments includes:

[0006] A ring track is movably installed between two construction platforms along the tunneling direction of the tunnel boring machine. The ring track has an arc shape that matches the curvature of the outer wall of the tunnel segment. Both ends of the ring track are provided with a longitudinal displacement adjustment mechanism for driving the ring track to move relative to the construction platform along the tunneling direction of the tunnel boring machine, thereby realizing the adjustment of the longitudinal displacement of the ring track.

[0007] An acoustic wave detector is reciprocally mounted on the outer side of the annular track, and the height of the acoustic wave detector is adjustable along the radial direction of the tube segment. A drive motor is provided between the acoustic wave detector and the annular track to drive the acoustic wave detector to reciprocate along the annular track. The acoustic wave detector is provided with a lifting adjustment mechanism to drive the acoustic wave detector to rise and fall along the radial direction of the tube segment, thereby adjusting the distance between the acoustic wave detector and the tube segment.

[0008] A waveform analyzer is connected to the acoustic wave detector and is used to receive and analyze the acoustic waves emitted by the acoustic wave detector.

[0009] Preferably, each of the longitudinal adjustment mechanisms includes two adjustment blocks respectively disposed on the corresponding construction platform along the tunneling direction of the tunnel boring machine, a longitudinal hydraulic cylinder is connected between the two adjustment blocks, and the end of the annular track is fixedly connected to one of the adjustment blocks on the corresponding construction platform.

[0010] Preferably, a rack is provided on the outer periphery of the annular track, and a gear is fixedly installed on the bottom of the acoustic wave detector. The gear meshes with the rack and is driven by the drive motor to roll along the annular track, thereby driving the acoustic wave detector to reciprocate along the annular track. The gear is coaxially connected to the output shaft of the drive motor.

[0011] Preferably, the lifting adjustment mechanism includes a lifting hydraulic cylinder disposed between the acoustic wave detector and the drive motor.

[0012] The technical effects achieved by this utility model due to the adoption of the above technical solution are as follows:

[0013] 1) By utilizing the changes in the propagation speed and frequency of sound waves in different media, the grouting fullness along the propagation path can be reflected. As the tunnel boring machine (TBM) advances, the grouting fullness can be detected in real time, saving grouting costs and improving the construction quality and efficiency of the TBM tunnel segments.

[0014] 2) It can be applied not only to newly built tunnels, but also to the health checks of existing tunnels;

[0015] 3) By setting up a circular track, a longitudinal adjustment mechanism, and a jacking adjustment mechanism, the dimensions can be finely adjusted according to the actual situation of the tunnel to meet the needs of different tunnels. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a perspective view of the real-time detection device for grouting behind the tunnel lining segments, according to an embodiment of this utility model.

[0018] Figure 2 This is a structural diagram of the circular track in this utility model.

[0019] Figure 3 This is an installation node diagram of the lifting and adjusting mechanism of the annular track in an embodiment of this utility model.

[0020] Figure 4 This is a diagram showing the installation nodes of the longitudinal movement adjustment mechanism of the annular track in an embodiment of this utility model.

[0021] Figure 5 This is a schematic diagram of the installation of the real-time detection device for grouting behind the tunnel lining segments in an embodiment of this utility model.

[0022] Figure 6 This is a flowchart illustrating the construction method for detecting grouting behind the tunnel lining using an embodiment of this utility model.

[0023] The correspondence between the numbers in the attached diagram is as follows:

[0024] 1-Shield tail of tunnel boring machine; 2- Acoustic wave detector; 3- Lifting hydraulic cylinder; 4- Drive motor; 5- Segment; 6- Circular track; 61- Rack; 7- Longitudinal hydraulic cylinder; 8- Adjusting block; 9- Construction platform. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figures 1 to 6As shown, this utility model embodiment provides a real-time detection device for grouting behind the tunnel segment wall of a shield tunnel. It is installed at the tail 1 of the shield machine. Two construction platforms 9 are symmetrically arranged inside the shield machine. The real-time detection device for grouting behind the tunnel segment wall of a shield tunnel includes a ring track 6, an acoustic wave detector 2, and a waveform analyzer. The ring track 6 is movably installed between the two construction platforms 9 along the tunneling direction of the shield machine. The ring track 6 has an arc shape that matches the curvature of the outer wall of the segment 5. Both ends of the ring track 6 are provided with a longitudinal displacement adjustment mechanism for driving the ring track 6 to move relative to the construction platform 9 along the tunneling direction of the shield machine, thereby realizing the adjustment of the longitudinal displacement of the ring track 6.

[0027] Furthermore, the acoustic wave detector 2 is reciprocally movable on the outside of the circular track 6, and the height of the acoustic wave detector 2 along the radial direction of the tube segment 5 is adjustable. A drive motor 4 is provided between the acoustic wave detector 2 and the circular track 6 to drive the acoustic wave detector 2 to reciprocate along the circular track 6. The acoustic wave detector 2 is provided with a lifting adjustment mechanism to drive the acoustic wave detector 2 to rise and fall radially along the tube segment, thereby adjusting the distance between the acoustic wave detector 2 and the tube segment 5.

[0028] Furthermore, the waveform analyzer is signal-connected to the acoustic wave detector 2 and is used to receive and analyze the acoustic waves emitted by the acoustic wave detector 2.

[0029] Please see Figures 2 to 4 As shown, each longitudinal adjustment mechanism includes two adjustment blocks 8 respectively installed on the corresponding construction platform along the tunneling direction of the tunnel boring machine. A longitudinal hydraulic cylinder 7 is connected between the two adjustment blocks 8, and the end of the annular track 6 is fixedly connected to one of the adjustment blocks 8 on the corresponding construction platform 9. It should be noted that in this embodiment, the longitudinal movement of the annular track 6 can be adjusted by the longitudinal hydraulic cylinder 7, thereby adapting to the needs of different tunnels.

[0030] Furthermore, a rack 61 is provided on the outer periphery of the annular track 6, and a gear (not shown in the figure) is fixedly installed on the bottom of the acoustic wave detector 2. The gear meshes with the rack 61 and is driven by the drive motor 4 to roll along the annular track 6, thereby driving the acoustic wave detector 2 to reciprocate along the annular track 6. The gear is coaxially connected with the output shaft of the drive motor 4. Preferably, in this embodiment, the lifting adjustment mechanism includes a lifting hydraulic cylinder 3 located between the acoustic wave detector 2 and the drive motor 4. By setting the lifting hydraulic cylinder 3, the distance between the acoustic wave detector 2 and the pipe segment 5 can be adjusted. The acoustic wave detector 2 includes an acoustic wave transmitter and an acoustic wave receiver, which have the functions of actively emitting acoustic waves and receiving acoustic waves along the propagation path. During operation, it actively vibrates the pipe segment by contacting it to emit acoustic waves and receives acoustic waves along the propagation path. The fullness of the grouting behind the wall is reflected by the changes in the propagation speed and attenuation of acoustic waves in different media.

[0031] Please see Figure 6 As shown, the construction method of using the real-time detection device for grouting behind the tunnel segment wall provided in this embodiment of the invention for grouting behind the tunnel segment wall includes the following steps:

[0032] 1) Install the entire device at the tail of the tunnel boring machine and fix it together with the construction platform of the tunnel boring machine. You can add appropriate connecting parts to ensure that the device is installed firmly.

[0033] 2) Test the circular track with power to ensure smooth movement of the acoustic wave detector and effective operation of the lifting hydraulic cylinder;

[0034] 3) Select measurement points. Generally, 7 measurement points are selected based on the vertical angles of 0°, ±60°, ±120°, and ±150°. Alternatively, the first 5 measurement points can be selected, or the entire path can be detected.

[0035] 4) During normal shield tunneling, segment assembly, and backfill grouting operations, adjust the equipment and start testing from one end (-150° or 150°);

[0036] 5) The acoustic wave detector (transmitter and receiver) is in operation, and the contact tube segment actively vibrates to emit acoustic waves and receives the acoustic waves in the propagation path;

[0037] 6) The waveform analyzer is used to detect the fullness of the grouting behind the wall. Generally, a relatively flat waveform indicates a good grouting effect. If there is a sudden change or break in the waveform curve, it indicates that the grouting is not full at this point.

[0038] 7) The inspection work moves forward along with the tunnel boring machine. If the inspection results are abnormal, the longitudinal hydraulic cylinder can be used to adjust the position of the equipment back and forth for re-inspection.

[0039] 8) If the waveform test results indicate that the grouting is not full, continue grouting and check the position that needs to be tested again by adjusting the longitudinal hydraulic cylinder and the ring track until the grouting is full.

[0040] 9) Continue tunnel excavation, and conduct back-wall grouting tests in sequence until the tunnel is completed.

[0041] All parts not described in this utility model are the same as or can be implemented using existing technology. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this utility model, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A real-time detection device for grouting behind the tunnel lining segments, installed at the tail of the tunnel boring machine (TBM), wherein two construction platforms are symmetrically arranged inside the TBM, characterized in that... The real-time detection device for grouting behind the tunnel segment wall of the shield tunnel includes: A ring track is movably installed between two construction platforms along the tunneling direction of the tunnel boring machine. The ring track has an arc shape that matches the curvature of the outer wall of the tunnel segment. Both ends of the ring track are provided with a longitudinal displacement adjustment mechanism for driving the ring track to move relative to the construction platform along the tunneling direction of the tunnel boring machine, thereby realizing the adjustment of the longitudinal displacement of the ring track. An acoustic wave detector is reciprocally mounted on the outer side of the annular track, and the height of the acoustic wave detector is adjustable along the radial direction of the tube segment. A drive motor is provided between the acoustic wave detector and the annular track to drive the acoustic wave detector to reciprocate along the annular track. The acoustic wave detector is provided with a lifting adjustment mechanism to drive the acoustic wave detector to rise and fall along the radial direction of the tube segment, thereby adjusting the distance between the acoustic wave detector and the tube segment. A waveform analyzer is connected to the acoustic wave detector and is used to receive and analyze the acoustic waves emitted by the acoustic wave detector.

2. The real-time detection device for grouting behind shield tunnel segments as described in claim 1, characterized in that: Each of the longitudinal adjustment mechanisms includes two adjustment blocks respectively disposed on the corresponding construction platform along the tunneling direction of the tunnel boring machine, a longitudinal hydraulic cylinder connecting the two adjustment blocks, and the end of the annular track being fixedly connected to one of the adjustment blocks on the corresponding construction platform.

3. The real-time detection device for grouting behind shield tunnel segments as described in claim 1, characterized in that: A rack is provided on the outer periphery of the annular track, and a gear is fixedly installed on the bottom of the acoustic wave detector. The gear meshes with the rack and is driven by the drive motor to roll along the annular track, thereby driving the acoustic wave detector to reciprocate along the annular track. The gear is coaxially connected to the output shaft of the drive motor.

4. The real-time detection device for grouting behind shield tunnel segments as described in claim 3, characterized in that: The lifting adjustment mechanism includes a lifting hydraulic cylinder located between the acoustic wave detector and the drive motor.

Images