A segment wall back grouting defect detection device and a detection method thereof

Abstract

The application discloses a kind of pipe piece wall post grouting defect detection device and its detection method, belong to tunnel pipe piece detection technical field, method steps: the flow state slurry stage and solidification slurry stage of pipe piece wall post grouting are constructed in different specific positions in different specific defect types corresponding ultrasonic waveform model;Real-time acquisition pipe piece slurry pouring flow state slurry stage and the ultrasonic waveform data of specific position in solidification slurry stage;Ultrasonic waveform data are compared with the ultrasonic waveform model that has been constructed to judge, to obtain pipe piece wall post grouting defect position and defect type.The application pipe piece wall post grouting defect detection device and its detection method can be aimed at the flow state slurry stage and solidification slurry stage of pipe piece wall post grouting in different specific positions in different specific defects Real-time detection, accurate and efficient, convenient and easy to operate.

Description

Technical Field

[0001] This invention belongs to the field of tunnel segment inspection technology, specifically relating to a device and method for detecting defects in grouting behind tunnel segments. Background Technology

[0002] For tunnels under construction, when using segment lining for support, grouting reinforcement can effectively fill the gaps between the surrounding rock and the segments, and provide a certain bearing capacity, thereby stabilizing the segment lining. It is an essential and important part of the construction process.

[0003] For tunnels under construction and planned, there are numerous segment grouting structures. However, many of these grouting structures suffer from defects such as insufficient local compaction and inadequate grout thickness, posing safety hazards to the tunnels. For example, during the grouting process behind the segment walls, due to the characteristics of the surrounding geological formations, the grout may not be densely packed in certain areas, or the filling thickness may be insufficient, failing to meet the filling requirements. Therefore, it is necessary to conduct defect detection on these segment grouting structures. Summary of the Invention

[0004] The purpose of this invention is to overcome the inability of existing address radar methods to accurately detect grouting quality defects, and to make up for the shortcomings of its technology by providing a device and method for detecting grouting defects behind the pipe segment wall.

[0005] To achieve the above objectives, the present invention is implemented using the following technical solution:

[0006] In a first aspect, the present invention provides a method for detecting defects in grouting behind tunnel lining segments, comprising the following steps:

[0007] Construct ultrasonic waveform models corresponding to different specific defect types at different specific locations in the fluid grout stage and solidification grout stage of the segment wall back grouting.

[0008] Real-time acquisition of ultrasonic waveform data at specific locations during the fluid slurry stage and the solidification slurry stage of segment slurry pouring;

[0009] The ultrasonic waveform data is compared with the constructed ultrasonic waveform model to determine the location and type of grouting defects behind the segment wall.

[0010] As a further improvement, the method for acquiring ultrasonic waveform data includes the following steps:

[0011] Several piezoelectric ceramic sensitive modules with the same height as the grout layer thickness are pre-embedded in the circumferential and longitudinal directions behind the tunnel segment wall, and several receiving transducers corresponding to the piezoelectric ceramic sensitive modules are set on the tunnel segment.

[0012] During grouting, a periodic pulse is used to excite the piezoelectric ceramic sensitive module to generate ultrasonic waves that pass through the grouting layer and are received and recorded by the receiving transducer.

[0013] The receiving transducer receives and records ultrasonic waveform data of the fluid grout stage at different grout layer thicknesses during the grouting process, as well as ultrasonic waveform data of the solidified grout stage when the grout layer is solidifying.

[0014] As a further improvement, the method for constructing an ultrasonic waveform model includes the following steps:

[0015] A piezoelectric ceramic sensitive module and receiving transducer are set at a distance that corresponds to the thickness of the grouting layer of the tunnel segment;

[0016] A grouting material with the same raw materials, mix ratio and age as the grouting layer of the segment is configured between the piezoelectric ceramic sensitive module and the receiving transducer, and the grouting material is simulated to be configured with different grouting layer thicknesses and different specific defect types.

[0017] The ultrasonic waves transmitted by the piezoelectric ceramic sensitive module and passing through the simulated grout are received by a receiving transducer to obtain ultrasonic data corresponding to different ultrasonic emission frequencies, different thicknesses, and different specific defect types. The ultrasonic data includes propagation time / velocity, received wave amplitude, and frequency.

[0018] As a further improvement, when single-liquid grout is used for grouting behind the segment wall, the receiving transducer receives and records the ultrasonic waveform data of the fluid grout stage when the grout layer thickness is 50%, 75%, and 100% during the grouting process;

[0019] When a two-component grout is used for grouting behind the pipe segment wall, the receiving transducer receives and records the ultrasonic waveform data of the fluid grout stage when the grout layer thickness is 50% and 100% during the grouting process.

[0020] As a further improvement, the measurement points of the piezoelectric ceramic sensitive module and the receiving transducer are arranged in a circumferential and longitudinal manner.

[0021] Circular layout: One ring is arranged every 15 rings, and the layout range of each ring is the entire ring tunnel, with no less than N measuring points, where N is the number of tunnel circumferential segments;

[0022] Longitudinal layout: 1 to 3 measuring points are arranged on the upper part of the tunnel for each ring, and the measuring points are arranged to avoid all fixed interference objects, including segment joints and segment bolts.

[0023] As a further improvement, different specific defect types include loose grout layer, foreign matter in grout layer, cracks in grout layer, and intact grout layer.

[0024] In a second aspect, the present invention also provides a detection device for the method of detecting defects in grouting behind the segment wall as described in the first aspect, comprising:

[0025] The tunnel segment layer, and the grouting layer voids are formed between the tunnel segment layer and the surrounding rock of the tunnel;

[0026] The piezoelectric ceramic sensitive module is installed in the grouting layer voids, and the height of the distance from the tunnel segment layer is equal to the thickness of the grouting layer at the location of the measurement point.

[0027] A receiving transducer is installed on the tunnel segment layer and corresponds one-to-one with the piezoelectric ceramic sensitive module. It is used to receive ultrasonic data corresponding to different ultrasonic emission frequencies, different thicknesses and different specific defect types that penetrate the grouting layer.

[0028] The signal source is configured to send periodic pulses to the piezoelectric ceramic sensitive module to excite the piezoelectric ceramic sensitive module to send ultrasonic waves to the grouting layer and the receiving transducer;

[0029] The oscilloscope is connected to both the signal source and the receiving transducer.

[0030] As a further improvement, when single-liquid grout is used for grouting behind the segment wall, the receiving transducer receives and records the ultrasonic waveform data of the fluid grout stage when the grout layer thickness is 50%, 75%, and 100% during the grouting process;

[0031] When a two-component grout is used for grouting behind the pipe segment wall, the receiving transducer receives and records the ultrasonic waveform data of the fluid grout stage when the grout layer thickness is 50% and 100% during the grouting process.

[0032] As a further improvement, the measurement points of the piezoelectric ceramic sensitive module and the receiving transducer are arranged in a circumferential and longitudinal manner.

[0033] Circular layout: One ring is arranged every 15 rings, and the layout range of each ring is the entire ring tunnel, with no less than N measuring points, where N is the number of tunnel circumferential segments;

[0034] Longitudinal layout: 1-3 points are arranged on the upper part of the tunnel for each ring, and the layout of the measuring points avoids all fixed interference objects, including segment joints and segment bolts.

[0035] Furthermore, the piezoelectric ceramic sensitive module is pre-embedded and fixed to the outside of the tube segment by a fixing bracket; the receiving transducer is pre-embedded to the outer surface of the tube segment by a fixing plate.

[0036] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The grouting defect detection device and method provided by the present invention construct waveform models of different stages, different grouting thicknesses, and different defect types, and combine them with a pre-embedded piezoelectric ceramic sensitive module and a receiving transducer to acquire ultrasonic waveform data under the corresponding stages, thicknesses, and other conditions in real time. By comparing and judging, the current state of the grouting layer (defects and their locations) can be obtained. It can perform real-time detection of different specific defects at different specific locations in the fluid grouting stage and the solidified grouting stage of the grouting behind the tunnel segment wall, which is accurate, efficient, convenient and easy to operate. Attached Figure Description

[0037] Figure 1 A flowchart of a method for detecting defects in grouting behind tunnel lining segments provided in an embodiment of the present invention;

[0038] Figure 2 This is a schematic diagram of a grouting defect detection device for pipe segment walls provided in an embodiment of the present invention;

[0039] Figure 3 This is a schematic diagram of the pre-embedded layout location of a piezoelectric ceramic sensitive module provided in an embodiment of the present invention;

[0040] Figure 4 This is a simulated schematic diagram of a grouting defect detection device for pipe segment walls provided in an embodiment of the present invention.

[0041] In the picture:

[0042] 1. Tunnel; 2. Segment layer; 3. Grouting layer; 4. Piezoelectric ceramic sensitive module; 5. Receiving transducer; 6. Fixing frame; 7. Fixing plate; 8. Lead wire. Detailed Implementation

[0043] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0044] Example

[0045] like Figure 1 and Figure 2 As shown, this embodiment of the invention provides a method and device for detecting defects in grouting behind the tunnel segment wall, enabling the detection of different structural defects in solid grout and fluid grout during grouting behind the tunnel segment wall.

[0046] Among them, reference Figure 2 and Figure 3 The segment wall grouting defect detection device includes:

[0047] Tunnel segment layer 2, and the grouting layer 3 voids are formed between the tunnel segment layer 2 and the surrounding rock of tunnel 1;

[0048] The piezoelectric ceramic sensitive module 4 is installed in the gap of the grouting layer 3, and the height of the distance from the tunnel segment layer 2 is equal to the thickness of the grouting layer 3 at the location of the measurement point.

[0049] The receiving transducer 5 is set on the tunnel segment layer 2 and corresponds one-to-one with the piezoelectric ceramic sensitive module 4. It is used to receive ultrasonic data corresponding to different ultrasonic emission frequencies, different thicknesses and different specific defect types that penetrate the grouting layer 3.

[0050] The signal source is configured to send periodic pulses to the piezoelectric ceramic sensitive module 4 to excite the piezoelectric ceramic sensitive module 4 to send ultrasonic waves to the grouting layer 3 and the receiving transducer 5.

[0051] The oscilloscope is connected to the signal source and the receiving transducer 5, respectively.

[0052] The detection method employed with the aforementioned detection device includes the following steps:

[0053] Step S1: Construct ultrasonic waveform models corresponding to different specific defect types at different specific locations in the fluid grout stage and solidification grout stage of the segment wall grouting.

[0054] Step S2: Real-time acquisition of ultrasonic waveform data at specific locations during the fluid grout stage and the solidification grout stage of segment grout casting;

[0055] Step S3: Compare and judge the ultrasonic waveform data with the constructed ultrasonic waveform model to obtain the location and type of grouting defects behind the pipe segment wall;

[0056] Step S4: When the type and location of the defects in the current grouting layer 3 are determined, the defects are repaired in a timely manner.

[0057] In this embodiment, reference Figure 4 As shown, the method for constructing an ultrasonic waveform model includes the following steps:

[0058] Step S1-1: Set up piezoelectric ceramic sensitive modules 4 and receiving transducers 5 at the same distance as the thickness of the grouting layer 3 of the tunnel segment;

[0059] Step S1-2: A grouting material with the same raw materials, mix ratio, and age as the grouting layer 3 of the tunnel segment is configured between the piezoelectric ceramic sensitive module 4 and the receiving transducer 5. The grouting material is simulated to have different thicknesses of the grouting layer 3 and different specific defect types. The distance between the piezoelectric ceramic sensitive module 4 and the receiving transducer 5 can be adjusted in concrete specimens (molds) to simulate the thickness of the grouting layer 3. At the same time, the thickness of the grouting material can be adjusted in concrete specimens (molds) to simulate different stages of the grouting process.

[0060] Step S1-3: Use the receiving transducer 5 to receive the ultrasonic waves transmitted by the piezoelectric ceramic sensitive module 4 and passing through the simulated grouting material to obtain ultrasonic data corresponding to different ultrasonic emission frequencies, different thicknesses and different specific defect types. The ultrasonic data includes propagation time / velocity, received wave amplitude and frequency.

[0061] Step S1-4: In constructing the waveform model, multiple transmission frequencies are used to detect each specified type of defect, and the waveform data obtained from the detection at multiple frequencies are used to construct the waveform model corresponding to the specified type of defect, so as to obtain richer and more accurate detection results.

[0062] Furthermore, when constructing waveform models for single-liquid and dual-liquid slurries, different thickness stage data are selected. Since the dual-liquid slurry rapidly changes from a high-flow state to a gel state after the addition of water glass, only the waveforms of the slurry height model are constructed for the flow into 1 / 2 and the complete burial of the sensitive module. The rest of the process is the same as that of the single-liquid slurry.

[0063] 1) When single-liquid grout is used for grouting behind the pipe segment wall, the receiving transducer 5 receives and records the ultrasonic waveform data of the fluid grout stage when the thickness of the grout layer 3 is 50%, 75%, and 100% during the grouting process;

[0064] 2) When the grouting behind the pipe segment wall uses a two-liquid grout, the receiving transducer 5 receives and records the ultrasonic waveform data of the fluid grout stage when the thickness of the grouting layer 3 is 50% and 100% during the grouting process.

[0065] In this embodiment, for the fluid slurry stage and the solidified slurry stage, the ultrasonic waveform data output by the piezoelectric ceramic sensitive module 4 is used to establish the waveform model corresponding to the defect type. The different specific defect types include the grouting layer 3 not being dense, the grouting layer 3 having foreign matter, the grouting layer 3 having cracks, and the grouting layer 3 being intact.

[0066] In this embodiment, the method for acquiring ultrasonic waveform data includes the following steps:

[0067] Step S2-1: Several piezoelectric ceramic sensitive modules 4 with the same height as the grouting layer 3 are pre-embedded in the rear of the tube wall along the circumferential and longitudinal directions, and several receiving transducers 5 corresponding to the piezoelectric ceramic sensitive modules 4 are set on the tube.

[0068] Step S2-2: During grouting, the piezoelectric ceramic sensitive module 4 is excited by periodic pulses to generate ultrasonic waves that pass through the grouting layer 3 and are received and recorded by the receiving transducer 5.

[0069] Step S2-3: The receiving transducer 5 receives and records the ultrasonic waveform data of the fluid grout stage when the grout layer 3 has different thicknesses during the grouting process, and receives and records the ultrasonic waveform data of the solidified grout stage when the grout layer 3 is solidifying.

[0070] In this embodiment, the measurement points of the piezoelectric ceramic sensitive module 4 and the receiving transducer 5 are arranged in a circumferential and longitudinal manner.

[0071] Among them, the circumferential layout is as follows: one ring is arranged every 15 rings, and the layout range of each ring is the entire ring of tunnel 1, and the number of measuring points is not less than N, where N is the number of circumferential segments of tunnel 1.

[0072] Longitudinal layout: 1 to 3 measuring points are arranged on the upper part of each ring of tunnel 1, and the measuring points are arranged to avoid all fixed interference objects, including segment joints and segment bolts.

[0073] See Figure 2 The piezoelectric ceramic sensitive module 4 is pre-embedded and fixed to the outside of the tunnel segment via a fixing bracket 6. The height of the piezoelectric ceramic sensitive module 4 from the tunnel segment can be adjusted by changing the length of the fixing bracket 6 during pre-embedding. The receiving transducer 5 is pre-embedded on the outer surface of the tunnel segment via a fixing plate 7. Both the piezoelectric ceramic sensitive module 4 and the receiving transducer 5 are equipped with lead-out lines 8 for external devices. Pre-embedding on the tunnel segment allows for subsequent testing operations after the tunnel segment 1 is laid, avoiding the problems of limited space, poor distance and dimensional control accuracy, and operational difficulties associated with installing the corresponding modules and receivers after the tunnel segment is laid.

[0074] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0075] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0076] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for detecting defects in grouting behind tunnel lining segments, characterized in that, The methods and steps include the following: Construct ultrasonic waveform models corresponding to different specific defect types at different specific locations in the fluid grout stage and solidification grout stage of the segment wall back grouting. Real-time acquisition of ultrasonic waveform data at specific locations during the fluid slurry stage and the solidification slurry stage of segment slurry pouring; The ultrasonic waveform data is compared with the constructed ultrasonic waveform model to determine the location and type of grouting defects behind the segment wall. The method for acquiring ultrasonic waveform data includes the following steps: Several piezoelectric ceramic sensitive modules with the same height as the grout layer thickness are pre-embedded in the circumferential and longitudinal directions behind the tunnel segment wall, and several receiving transducers corresponding to the piezoelectric ceramic sensitive modules are set on the tunnel segment. During grouting, a periodic pulse is used to excite the piezoelectric ceramic sensitive module to generate ultrasonic waves that pass through the grouting layer and are received and recorded by the receiving transducer. The receiving transducer receives and records ultrasonic waveform data of the fluid grout stage at different grout layer thicknesses during the grouting process, as well as ultrasonic waveform data of the solidified grout stage when the grout layer is solidifying. The method for constructing an ultrasonic waveform model includes the following steps: A piezoelectric ceramic sensitive module and receiving transducer are set at a distance that corresponds to the thickness of the grouting layer of the tunnel segment; A grouting material with the same raw materials, mix ratio, and age as the grouting layer of the tunnel segment is configured between the piezoelectric ceramic sensitive module and the receiving transducer. The grouting material is simulated to have different grouting layer thicknesses and different specific defect types. The different specific defect types include grouting layer that is not dense, grouting layer with foreign matter, grouting layer with cracks, and grouting layer that is intact. The ultrasonic waves transmitted by the piezoelectric ceramic sensitive module and passing through the simulated grout are received by a receiving transducer to obtain ultrasonic data corresponding to different ultrasonic emission frequencies, different thicknesses, and different specific defect types. The ultrasonic data includes propagation time, propagation speed, received wave amplitude, and frequency. When single-liquid grout is used for grouting behind the pipe segment wall, the receiving transducer receives and records the ultrasonic waveform data of the fluid grout stage when the grout layer thickness is 50%, 75%, and 100% during the grouting process; When a two-component grout is used for grouting behind the tunnel lining wall, the receiving transducer receives and records the ultrasonic waveform data of the fluid grout stage when the grout layer thickness is 50% and 100% during the grouting process; The piezoelectric ceramic sensitive module is pre-embedded and fixed to the outside of the tube segment by a fixing bracket, and the height of the piezoelectric ceramic sensitive module from the tube segment can be adjusted by adjusting the length of the fixing bracket during pre-embedding; the receiving transducer is pre-embedded on the outer surface of the tube segment by a fixing plate.

2. The method for detecting defects in grouting behind the tunnel lining wall according to claim 1, characterized in that, The measurement points of the piezoelectric ceramic sensitive module and the receiving transducer are arranged in a circumferential and longitudinal manner. Circular layout: One ring is arranged every 15 rings, and the layout range of each ring is the entire ring tunnel, with no less than N measuring points, where N is the number of tunnel circumferential segments; Longitudinal layout: 1 to 3 measuring points are arranged on the upper part of the tunnel for each ring, and the measuring points are arranged to avoid all fixed interference objects, including segment joints and segment bolts.

3. The detection device for the method of detecting defects in grouting behind the tunnel lining wall as described in any one of claims 1 to 2, characterized in that, include: The tunnel segment layer, and the grouting layer voids are formed between the tunnel segment layer and the surrounding rock of the tunnel; The piezoelectric ceramic sensitive module is installed in the grouting layer voids, and the height of the distance from the tunnel segment layer is equal to the thickness of the grouting layer at the location of the measurement point. A receiving transducer is installed on the tunnel segment layer and corresponds one-to-one with the piezoelectric ceramic sensitive module. It is used to receive ultrasonic data corresponding to different ultrasonic emission frequencies, different thicknesses and different specific defect types that penetrate the grouting layer. The signal source is configured to send periodic pulses to the piezoelectric ceramic sensitive module to excite the piezoelectric ceramic sensitive module to send ultrasonic waves to the grouting layer and the receiving transducer; The oscilloscope is connected to both the signal source and the receiving transducer.

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