CN-122017015-A - Method, system and device for detecting leakage of outer wall of underground structure

CN122017015ACN 122017015 ACN122017015 ACN 122017015ACN-122017015-A

Abstract

The invention relates to the technical field of ultrasonic detection, in particular to a method, a system and a device for detecting leakage of an outer wall of an underground structure, wherein the method comprises the steps of analyzing the disorder condition of ultrasonic waveforms of detection points of the outer wall of the underground structure to obtain the possibility of a reinforced bar area of the detection points; and obtaining standard amplitude of each moment in the standard waveform of the reinforcing steel bar by the reinforcing steel bar area possibility of each detection point in the target range of the target detection point and the ultrasonic amplitude of each detection point at each moment, removing the standard waveform of the reinforcing steel bar from the ultrasonic waveform to obtain an abnormal signal waveform, thereby carrying out leakage detection on the outer wall of the underground structure. According to the invention, the interference of the steel bar is subjected to characteristic modeling and removed, so that the obstacle is cleared for the leakage detection of the outer wall of the underground structure, and the detection precision and reliability of the leakage of the outer wall of the underground structure are improved.

Inventors

NAN JIANG
GONG NING
ZHENG ZHICHAO
CUI HONGCHAO
LIU YUANBO
ZHANG XUANMING
ZHANG YAJUN
XUE PENGJUN

Assignees

中交三公局华中建设有限责任公司

Dates

Publication Date: 20260512
Application Date: 20260126

Claims (10)

1. The method for detecting leakage of the outer wall of the underground structure is characterized by comprising the following steps: Analyzing the disorder condition of ultrasonic waveforms of detection points of an outer wall of the underground structure to obtain the possibility of a reinforced bar area of the detection points; determining the referential property of the detection point for participating in the acquisition of the standard waveform of the steel bar according to the symmetry condition of the possibility of the steel bar area in the transverse direction and the longitudinal direction in the local range of the detection point; Screening to obtain target detection points according to the referential of each detection point; obtaining standard amplitude of each moment in the standard waveform of the reinforcing steel bar according to the possibility of the reinforcing steel bar area of each detection point in the target range of the target detection point and the ultrasonic amplitude of each detection point at each moment; removing the standard waveform of the steel bar from the ultrasonic waveform to obtain an abnormal signal waveform; And carrying out leakage detection on the outer wall of the underground structure according to the abnormal signal waveform.
2. The method for detecting leakage of an outer wall of an underground structure according to claim 1, wherein the process for obtaining the possibility of the reinforced bar area comprises the steps of: Screening a plurality of peaks from each maximum value in the ultrasonic waveform; Obtaining peak intensity from the peak amplitude average value; obtaining the fluctuation degree of the peak time interval according to the time interval between adjacent peaks; And obtaining the possibility of the reinforced bar area according to the peak intensity, the peak time interval fluctuation degree and the peak quantity, wherein the possibility of the reinforced bar area is positively correlated with the peak intensity and the peak quantity and inversely correlated with the peak time interval fluctuation degree.
3. The method for detecting leakage of an outer wall of an underground structure according to claim 1, wherein the reference acquisition process comprises the steps of: Acquiring the difference of the possibility of the reinforced bar area of each symmetrical point pair in the transverse direction by taking the detection point as the center to obtain a transverse symmetrical characteristic, wherein the symmetrical point pair comprises two other detection points with a position symmetrical relation by taking the detection point as the center; acquiring the difference of the possibility of the reinforced bar area of each symmetrical point pair in the longitudinal direction by taking the detection point as the center to obtain longitudinal symmetrical characteristics, wherein the longitudinal symmetrical characteristics are inversely related to the difference of the possibility of the reinforced bar area of each symmetrical point pair in the longitudinal direction; And fusing the transverse symmetry feature and the longitudinal symmetry feature to obtain the referential.
4. The method for detecting leakage of an outer wall of an underground structure according to claim 1, wherein the step of obtaining the target detection point by screening from the references of the detection points comprises: Determining the referential of each detection point and the size of a preset referential threshold, and if detection points corresponding to the referential which is larger than the preset referential threshold exist, acquiring the detection point with the largest referential as the target detection point.
5. The method for detecting leakage of an outer wall of an underground structure according to claim 1, wherein the process of obtaining the standard amplitude comprises the steps of: Obtaining the influence weight of each detection point according to the steel bar area possibility of each detection point in the target range of the target detection point, wherein the influence weight is positively related to the steel bar area possibility; according to the influence weight of each detection point, carrying out weighted summation on the ultrasonic amplitude of each detection point at any moment to obtain the standard amplitude of the steel bar at any moment in the standard waveform; Correspondingly, the standard waveform of the reinforcing steel bar is composed of standard amplitude at each moment.
6. The method for detecting leakage of an outer wall of an underground structure according to claim 1, wherein the process for acquiring the abnormal signal waveform comprises the steps of: time alignment is carried out on the ultrasonic wave form and the steel bar standard wave form; Subtracting the standard waveform of the steel bar from the ultrasonic waveform after time alignment to obtain the abnormal signal waveform.
7. The method for detecting leakage of an outer wall of an underground structure according to claim 1, wherein the detecting leakage of the outer wall of the underground structure according to the waveform of the abnormal signal comprises: Acquiring a peak amplitude difference sequence of the abnormal signal waveform of the detection point to be detected, wherein the peak amplitude difference sequence is formed by the amplitude differences of two adjacent peaks in the abnormal signal waveform; And determining the amplitude difference fluctuation degree of the peak amplitude difference sequence to obtain the initial possibility of leakage of the underground structure outer wall of the detection point to be detected.
8. The method for detecting leakage of an exterior wall of an underground structure according to claim 7, wherein after the initial possibility of leakage of the exterior wall of the underground structure at the detection point to be detected is obtained, the method for detecting leakage of the exterior wall of the underground structure further comprises: Obtaining the waveform similarity of abnormal signals between a detection point to be detected and a neighborhood detection point; obtaining the final leakage possibility of the outer wall of the underground structure of the detection point to be detected according to the waveform similarity of the abnormal signal and the initial leakage possibility of the outer wall of the underground structure, wherein the final leakage possibility of the outer wall of the underground structure is positively correlated with the waveform similarity of the abnormal signal and the initial leakage possibility of the outer wall of the underground structure.
9. An underground structure exterior wall leak detection system, comprising a memory and a processor, wherein the memory is connected with the processor, the memory is used for storing program instructions, and the processor is used for realizing the underground structure exterior wall leak detection method according to any one of claims 1-8 when the program instructions are executed.
10. An underground structure exterior wall leak detection apparatus comprising a computer readable storage medium storing a computer program which when executed by a processor performs the steps in the underground structure exterior wall leak detection method of any one of claims 1 to 8.

Description

Method, system and device for detecting leakage of outer wall of underground structure Technical Field The invention relates to the technical field of ultrasonic detection, in particular to a method, a system and a device for detecting leakage of an outer wall of an underground structure. Background The underground structure is an artificial structure which is built below the ground surface and has the functions of bearing, enclosing, space utilization and the like, and comprises building basements, underground garages, subway tunnels, underground comprehensive pipe galleries, foundation pit supporting structures, hydraulic tunnels and the like. The underground structure outer wall is used as a key barrier for isolating underground water from an inner space, and infiltration of the underground water can lead to corrosion of reinforcing steel bars, acceleration of carbonization of concrete, weakening of structural bearing capacity, and even initiation of potential safety hazards such as crack expansion, wall peeling and the like. Thus, it is important to detect leakage from the exterior wall of an underground structure. The existing common detection mode is ultrasonic detection, ultrasonic detection is carried out on an outer wall of a subsurface structure, the waveform characteristics of the received ultrasonic waves are analyzed, and the leakage state of the wall is obtained through analysis of the waveform characteristics, wherein when the wall structure is complete and has no leakage, the ultrasonic wave waveform only shows an initial wave and a normal boundary wave, the peak shape is sharp and clear, the wave crest interval is stable, no redundant clutter exists between the initial wave and the boundary wave, and the whole waveform is regular and has no abnormal disturbance. If a leakage channel exists in the wall body, the acoustic properties of the medium can be changed due to accumulated water at the leakage position, the acoustic wave can be scattered and reflected in a crack interface, at the moment, irregular extra amplitude peaks, such as irregular peak morphology disorder and obvious amplitude fluctuation, can appear between the initial wave and the interface wave, and the irregular peak interval can be circulated. Because the outer wall of the underground structure is usually a reinforced concrete structure (main reinforcements and stirrups are arranged in a staggered way to form a dense reinforcement mesh), when the ultrasonic waves encounter rigid media such as reinforcements in the propagation process, strong reflection and scattering can occur, and the continuity of acoustic wave propagation is directly damaged. The reflected signal of the steel bar can form a large number of extra peaks of non-initial wave and abnormal boundary wave in the received ultrasonic wave, wherein the peaks are more periodic (matched with the distance between the steel bars), the amplitude of the peaks is obviously higher than that of leakage defect signals, the clear outline of the initial wave and the boundary wave can be covered, and the peaks can be overlapped with the clutter of the leakage defect, so that the reflected signal of the steel bar and the leakage defect signals are difficult to distinguish, and the detection precision of the leakage of the outer wall of the underground structure is influenced. Disclosure of Invention In order to solve the technical problem that the detection accuracy of the leakage of the outer wall of the underground structure is affected due to the interference of the reflected signals of the reinforcing steel bars, the invention aims to provide a method, a system and a device for detecting the leakage of the outer wall of the underground structure, and the adopted technical scheme is as follows: in a first aspect of the present invention, there is provided a method of leak detection of an exterior wall of an underground structure, comprising: Analyzing the disorder condition of ultrasonic waveforms of detection points of an outer wall of the underground structure to obtain the possibility of a reinforced bar area of the detection points; determining the referential property of the detection point for participating in the acquisition of the standard waveform of the steel bar according to the symmetry condition of the possibility of the steel bar area in the transverse direction and the longitudinal direction in the local range of the detection point; Screening to obtain target detection points according to the referential of each detection point; obtaining standard amplitude of each moment in the standard waveform of the reinforcing steel bar according to the possibility of the reinforcing steel bar area of each detection point in the target range of the target detection point and the ultrasonic amplitude of each detection point at each moment; removing the standard waveform of the steel bar from the ultrasonic waveform to obtain an abnormal signal waveform; And carrying out le