A method for detecting water leakage at the milling joint

Abstract

The present invention discloses a method for detecting water leakage at the milling joint, which uses a controller, a plurality of wire reels, a water level gauge, a transmitting transducer, a first receiving transducer and a measuring tube. The distance between the joint of adjacent diaphragm wall segments and the two adjacent measuring tubes on both sides is equal. The transmitting transducer and the first receiving transducer move up and down in the measuring tubes on both sides of the joint to be detected through the corresponding wire reels respectively. When the transmitting transducer and the first receiving transducer move up a certain distance each time and the corresponding water level gauges are at the same horizontal height, the transmitting transducer emits ultrasonic signals, and the first receiving transducer receives ultrasonic signals. The first acoustic signal parameter curve along the depth direction of the joint area between the first segment and the second segment is drawn based on the ultrasonic signals received by the first receiving transducer. According to the acoustic signal parameter curve, the position of the water leakage defect section and the degree of the water leakage defect at the joint of adjacent diaphragm wall segments can be quickly and effectively judged.

Description

Technical Field

[0001] The present invention belongs to the technical field of construction quality inspection of underground structures, and particularly relates to a method for detecting seepage and leakage of a milling joint. Background Art

[0002] In recent years, with the development of underground space towards deeper and larger directions, the construction technology of using milling joints has been gradually widely applied in the construction of underground retaining wall structures. At present, affected by various factors such as formation conditions, mechanical equipment, construction technology, and personnel quality, the retaining wall body constructed by the milling joint construction technology is prone to problems such as mud and sand inclusion and staggered joints at the joints of the first and second phase trench sections, ultimately leading to adverse phenomena such as water seepage and leakage. Especially for the sandy confined aquifer commonly existing in the Shanghai area, the milling construction joint is the weakest link of the retaining wall structure, and the problem of water stop performance failure occurs from time to time.

[0003] At present, for the actual evaluation of the water stop performance of the milling construction joint, it is often through a series of pumping tests inside and outside the area after the completion of the entire wall body construction for overall performance evaluation. At this time, if the local water stop performance does not meet the standard, it is actually impossible to accurately locate the leakage area, and only the high-pressure jet grouting water stop piles can be successively constructed behind the soil body of each adjacent trench section joint. At the same time, this method belongs to indirect estimation, with a large amount of detection work and lag, and because the actual defect position of the wall body cannot be accurately located, the construction of a large range of high-pressure jet grouting water stop piles is costly and delays the construction period, lacking economy.

[0004] At present, there is no direct and effective detection means on the market to accurately detect and locate the seepage and leakage position of the milling joint. Summary of the Invention

[0005] The present invention aims to invent a method for detecting seepage and leakage of a milling joint, which is used to solve the problem that it is difficult to accurately locate the seepage and leakage position of the trench section joint of the retaining wall body brought by the milling construction technology, so as to further solve the quality control problem of the retaining wall based on the milling joint construction technology; provide a strong basis for the accurate implementation of the supplementary reinforcement for the problem section in the future.

[0006] To solve the above technical problems, the present invention provides the following technical solutions:

[0007] A method for detecting seepage and leakage of a milling joint, comprising the following steps:

[0008] Step 1: The measuring tubes are arranged along the perimeter direction of the retaining wall. In the retaining wall groove sections on both sides of the joint between adjacent retaining wall groove sections, a measuring tube is vertically arranged respectively. The distances of the two measuring tubes from the joint are equal, and the distances of the measuring tubes from the inner and outer walls of the retaining wall groove section are equal. The retaining wall groove sections on both sides of the joint of the adjacent retaining wall groove sections to be detected are the first groove section and the second groove section respectively. The measuring tube is fixed together with the corresponding steel reinforcement cage, and the measuring tube is lowered into the groove section together with the corresponding steel reinforcement cage. Subsequently, concrete pouring is completed to form the retaining wall groove section;

[0009] Step 2: After the first groove section and the second groove section are both poured and reach the required strength, inject clear water into the measuring tubes on both sides of the joint of the first groove section and the second groove section respectively. The transmitting transducer and the first receiving transducer are respectively placed into the measuring tubes on both sides of the joint of the first groove section and the second groove section through two wire reels and moved to the bottom of the corresponding measuring tubes. A water level gauge is respectively arranged on the transmitting transducer and the first receiving transducer, and the water level gauges can respectively reflect the water level information of the transmitting transducer and the receiving transducer. The wire reels are respectively connected to and controlled by a controller, and the controller can receive the water level information measured by each water level gauge;

[0010] Step 3: According to the water level information of the transmitting transducer and the first receiving transducer fed back by the water level gauges, adjust the positions of the transmitting transducer and the first receiving transducer through their respective wire reels to ensure that the transmitting transducer and the first receiving transducer are at the same depth position;

[0011] Step 4: Start the transmitting transducer and the first receiving transducer through the controller. The transmitting transducer emits ultrasonic signals, and the first receiving transducer receives ultrasonic signals;

[0012] Step 5: Lift the transmitting transducer a certain distance through the wire reel. According to the water level information of the transmitting transducer and the first receiving transducer fed back by the water level gauges, adjust the position of the first receiving transducer through the wire reel to make the first receiving transducer reach the depth position where the receiving transducer is located;

[0013] Step 6: Repeat the operations in Steps 4 and 5 until the transmitting transducer and the first receiving transducer reach the ground surface. Draw the acoustic signal parameter curve along the depth direction of the joint area between the first groove section and the second groove section through the ultrasonic signals received by the first receiving transducer as the first acoustic signal parameter curve;

[0014] Step 7: Judge the position of the leakage defect section and the degree of the leakage defect of the joint between adjacent retaining wall groove sections according to the first acoustic signal parameter curve.

[0015] Preferably, in the above-mentioned milling joint leakage detection method, in step 7, the position of the leakage defect section of the joint between adjacent retaining wall segments is the area where distortion or a sudden rise in amplitude appears in the first acoustic signal parameter curve, and the amplitude of the area with distortion or a sudden rise in amplitude in the first acoustic signal parameter curve characterizes the defect degree of the leakage defect section of the joint between adjacent retaining wall segments.

[0016] Preferably, in the above-mentioned milling joint leakage detection method, lifting the transmitting transducer a certain distance on the wire reel means lifting the transmitting transducer 10 - 20 cm on the wire reel.

[0017] Preferably, in the above-mentioned milling joint leakage detection method, by comparing and analyzing the first acoustic signal parameter curve with the normal span acoustic signal parameter curve, the position of the leakage defect section of the joint between adjacent retaining wall segments and the leakage defect degree are judged.

[0018] Preferably, in the above-mentioned milling joint leakage detection method, two vertically arranged sounding tubes are set in each retaining wall segment, namely the first sounding tube and the second sounding tube. The distance between each sounding tube and the joint of the adjacent retaining wall segment is 1 / 4 of the length of the retaining wall segment, and the distance between the two sounding tubes is 1 / 2 of the length of the retaining wall segment. The distances from the sounding tubes to the inner and outer walls of the retaining wall segment are equal. The transmitting transducer is arranged in the second sounding tube of the first segment, and the first receiving transducer is arranged in the first sounding tube of the second segment.

[0019] Preferably, in the above-mentioned milling joint leakage detection method, a second receiving transducer is further included. The second receiving transducer is arranged in the first sounding tube of the first segment. The second receiving transducer moves up and down in the corresponding sounding tube through the corresponding wire reel. The sounding tubes where the first receiving transducer and the second receiving transducer are located are respectively at the same distance from the sounding tube where the transmitting transducer is located.

[0020] Preferably, in the above-mentioned milling joint leakage detection method, in step 4, the transmitting transducer, the first receiving transducer and the second receiving transducer are started by the controller. When the transmitting transducer emits ultrasonic signals, the first receiving transducer and the second receiving transducer receive ultrasonic signals; in step 5, the transmitting transducer is lifted a certain distance on the wire reel. According to the water level information of the transmitting transducer, the first receiving transducer and the second receiving transducer fed back by the water level gauge, the positions of the first receiving transducer and the second receiving transducer are respectively adjusted by the wire reel so that the first receiving transducer and the second receiving transducer reach the depth position where the transmitting transducer is located.

[0021] Preferably, in the above milling joint leakage detection method, in step 6, repeat steps 4 and 5 until the transmitting transducer, the first receiving transducer, and the second receiving transducer reach the ground surface. Draw the acoustic signal parameter curve along the depth direction of the joint area between the first groove section and the second groove section through the ultrasonic signal received by the first receiving transducer as the first acoustic signal parameter curve, and draw the acoustic signal parameter curve of the first groove section itself through the ultrasonic signal received by the second receiving transducer as the second acoustic signal parameter curve.

[0022] Preferably, in the above milling joint leakage detection method, step 7 further includes being able to judge the wall-forming quality of the first groove section itself according to the second acoustic signal parameter curve.

[0023] Preferably, in the above milling joint leakage detection method, step 7 further includes comparing the first acoustic signal parameter curve and the second acoustic signal parameter curve to judge the position and degree of the leakage defect section of the joint between adjacent retaining wall groove sections. When comparing the two, the area where distortion or sudden increase in amplitude appears in the first acoustic signal parameter curve is the position of the leakage defect section of the joint between adjacent retaining wall groove sections, and the amplitude of the area where distortion or sudden increase in amplitude appears in the first acoustic signal parameter curve represents the degree of the leakage defect section of the joint between adjacent retaining wall groove sections.

[0024] Preferably, in the above milling joint leakage detection method, the sounding tube is fixed together with the corresponding steel reinforcement cage, and the sounding tube is lowered into the groove section together with the corresponding steel reinforcement cage, and then concrete pouring is completed to form the retaining wall groove section.

[0025] As can be seen from the above disclosed technical solutions, compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] A method for detecting seepage and leakage at the milling joint provided by the present invention uses a controller, a measuring tube, a plurality of wire reelers, a water level gauge, a transmitting transducer, and a first receiving transducer. A water level gauge is respectively arranged on the transmitting transducer and the first receiving transducer. The wire reelers are respectively connected to the controller and controlled by it. The controller receives the water level information measured by each water level gauge. The measuring tubes are uniformly arranged along the circumferential direction of the retaining wall. At least one vertically arranged measuring tube is provided in each diaphragm wall groove section. The distance between the joint of adjacent diaphragm wall groove sections and the two adjacent measuring tubes on both sides is equal. The distance from the measuring tube to the inner and outer wall surfaces of the diaphragm wall groove section is equal. The transmitting transducer and the first receiving transducer respectively move up and down in the measuring tubes on both sides of the joint to be detected through the corresponding wire reelers. The transmitting transducer and the first receiving transducer are gradually moved up from top to bottom by the wire reelers. When the transmitting transducer and the first receiving transducer are moved up by a certain distance and the corresponding water level gauges are at the same horizontal height, the transmitting transducer emits ultrasonic signals, and the first receiving transducer receives ultrasonic signals. The acoustic signal parameter curve of the joint area between the first groove section and the second groove section along the depth direction is drawn through the ultrasonic signals received by the first receiving transducer, as the first acoustic signal parameter curve. The controller judges the position of the seepage and leakage defect section and the degree of the seepage and leakage defect at the joint of adjacent diaphragm wall groove sections according to the first acoustic signal parameter curve. Compared with the existing method for detecting and evaluating the seepage and leakage at the milling joint of the retaining wall by pumping test, the advantages of the present invention are as follows: The present invention can detect the water stop performance of the milling joint during the construction stage of the retaining wall before earth excavation, and the detection method is more timely, avoiding problems such as difficult handling due to site limitations even if the leakage position is found later. Through the distribution characteristics of the first acoustic signal parameter curve, that is, the cross-span detection curve of the retaining wall body, it can quickly and effectively judge whether there is a hidden danger of seepage and leakage at the joint, and at the same time, it can accurately locate the actual section position in the depth direction of the seepage and leakage at the wall section joint, greatly reducing the scope and volume of the later supplementary construction, which is of great significance for improving the construction efficiency and shortening the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 FIG. 1 is a schematic structural diagram of Embodiment 1 of a method for detecting seepage and leakage at the milling joint of the present invention.

[0028] Figure 2 FIG. 2 is a schematic diagram of the distribution of the measuring tubes in Embodiment 1 of a method for detecting seepage and leakage at the milling joint of the present invention.

[0029] Figure 3 FIG. 3 Figure 1 is an enlarged view of part A of FIG. 2.

[0030] Figure 4 FIG. 4 is a schematic diagram of the first acoustic signal parameter curve in Embodiment 1.

[0031] Figure 5It is a schematic comparison diagram of the first acoustic signal parameter curve and the normal span acoustic signal parameter curve in the first embodiment.

[0032] Figure 6 It is a schematic structural diagram of the second embodiment of a method for detecting seepage and leakage at a milled joint of the present invention.

[0033] Figure 7 It is a schematic distribution diagram of measuring tubes in the second embodiment of a method for detecting seepage and leakage at a milled joint of the present invention.

[0034] Figure 8 It is Figure 6 The enlarged view of part B of

[0035] Figure 9 It is a schematic diagram of the first acoustic signal parameter curve in the second embodiment.

[0036] Figure 10 It is a schematic diagram of the second acoustic signal parameter curve in the second embodiment.

[0037] Figure 11 It is a schematic comparison diagram of the first acoustic signal parameter curve and the second acoustic signal parameter curve in the second embodiment.

[0038] In the figure: 1 - controller, 2 - wire reel, 3 - water level gauge, 4 - transmitting transducer, 5 - first receiving transducer, 6 - second receiving transducer, 7 - retaining wall trench segment, 7a - first slot segment, 7b - second slot segment, 8 - measuring tube, 8a - first measuring tube, 8b - second measuring tube, 9 - joint, 10 - first acoustic signal parameter curve, 10' - normal span acoustic signal parameter curve, 11 - second acoustic signal parameter curve. Specific implementation manners

[0039] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The following will describe the technical content and features of the present invention in detail in combination with the enumerated embodiments and the accompanying drawings. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise scales, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. For the sake of description convenience, the "upper" and "lower" directions mentioned below are consistent with the upper and lower directions of the accompanying drawings, but this cannot be a limitation to the technical solution of the present invention.

[0040] Embodiment 1

[0041] Please refer to Figures 1 to 5 , this embodiment discloses a method for detecting seepage and leakage at a milled joint, including the following steps:

[0042] Step 1: The measuring tubes 8 are arranged along the circumferential direction of the retaining wall. In the retaining wall trench segments on both sides of the joint 9 between adjacent retaining wall trench segments, a measuring tube 8 is vertically arranged respectively. The distances of the two measuring tubes from the joint 9 are equal. The distances from the measuring tube 8 to the inner and outer walls of the retaining wall trench segment are equal. In this embodiment, the distance between the joint 9 of adjacent retaining wall trench segments and the two adjacent measuring tubes 8 on both sides is 2 / L, where L is the length of the retaining wall trench segment. The distances from the measuring tube 8 to the inner and outer walls of the retaining wall trench segment are both 1 / B, where B is the thickness of the retaining wall trench segment. The retaining wall trench segments on both sides of the joint 9 of the adjacent retaining wall trench segments to be detected are the first trench segment 7a and the second trench segment 7b respectively. The measuring tube 8 is fixed together with the corresponding steel reinforcement cage. The measuring tube 8 is lowered into the trench segment together with the corresponding steel reinforcement cage, and then concrete pouring is completed to form the retaining wall trench segment;

[0043] Step 2: After the first trench segment 7a and the second trench segment 7b are both poured and reach the required strength, clear water is injected into the measuring tubes 8 on both sides of the joint of the first trench segment 7a and the second trench segment 7b respectively. The transmitting transducer 4 and the first receiving transducer 5 are respectively placed into the measuring tubes 8 on both sides of the joint of the first trench segment 7a and the second trench segment 7b through two wire reels 2 and moved to the bottom of the corresponding measuring tube 8. A water level gauge 3 is respectively arranged on the transmitting transducer 4 and the first receiving transducer 5. The water level gauge 3 can respectively reflect the water level information of the transmitting transducer 4 and the receiving transducer. The wire reels 2 are respectively connected to the controller 1 and controlled by it. The controller 1 can receive the water level information measured by each water level gauge 3;

[0044] Step 3: According to the water level information of the transmitting transducer 4 and the first receiving transducer 5 fed back by the water level gauge 3, the positions of the transmitting transducer 4 and the first receiving transducer 5 are adjusted through their respective wire reels 2 to ensure that the transmitting transducer 4 and the first receiving transducer 5 are at the same depth position;

[0045] Step 4: The transmitting transducer 4 and the first receiving transducer 5 are started through the controller 1. The transmitting transducer 4 emits ultrasonic signals, and the first receiving transducer 5 receives ultrasonic signals;

[0046] Step 5: The transmitting transducer 4 is lifted a certain distance through the wire reel 2. According to the water level information of the transmitting transducer 4 and the first receiving transducer 5 fed back by the water level gauge 3, the position of the first receiving transducer 5 is adjusted through the wire reel 2 to make the first receiving transducer 5 reach the depth position where the receiving transducer is located;

[0047] Step 6: Repeat the operations in Steps 4 and 5 until the transmitting transducer 4 and the first receiving transducer 5 reach the ground surface. The acoustic signal parameter curve along the depth direction of the joint area between the first trench segment 7a and the second trench segment 7b is drawn through the ultrasonic signals received by the first receiving transducer 5 as the first acoustic signal parameter curve 10;

[0048] Step 7: Determine the location and degree of the leakage defect section at the joint of adjacent diaphragm wall segments based on the first acoustic signal parameter curve.

[0049] Compared with the existing method for detecting and evaluating the leakage of the milling joint of the diaphragm wall by pumping test, the milling joint leakage detection method provided by the present invention can detect the water-stop performance of the milling joint during the construction stage of the diaphragm wall before earth excavation. The detection method is more timely, avoiding problems such as difficult treatment due to site restrictions even if the leakage location is found later. Through the distribution characteristics of the first acoustic signal parameter curve, that is, the cross-span detection curve of the diaphragm wall body, it is possible to quickly and effectively determine whether there is a potential leakage at the joint, and at the same time, accurately locate the actual section position in the depth direction of the leakage at the wall segment joint, greatly reducing the scope and volume of the subsequent supplementary construction, which is of great significance for improving construction efficiency and shortening the construction period.

[0050] Preferably, in the above-mentioned milling joint leakage detection method, in Step 7, the position of the leakage defect section at the joint of adjacent diaphragm wall segments is the area where distortion or a sudden rise in amplitude appears in the first acoustic signal parameter curve, and the amplitude of the area where distortion or a sudden rise in amplitude appears in the first acoustic signal parameter curve represents the degree of the leakage defect section at the joint of adjacent diaphragm wall segments. The determination of the section where distortion or a sudden rise in amplitude appears in the first acoustic signal parameter curve indicates that there are significant non-uniform characteristics at the joint of this depth section, which is an important passage for mud and sand inclusion and water leakage. Based on this, the position of the leakage defect section at the milling joint and the approximate degree of the leakage defect can be directly obtained.

[0051] Preferably, in the above-mentioned milling joint leakage detection method, by comparing and analyzing the first acoustic signal parameter curve 10 with the normal cross-span acoustic signal parameter curve 10', the position of the leakage defect section at the joint of adjacent diaphragm wall segments and the degree of the leakage defect are determined. When comparing the two, the area where distortion or a sudden rise in amplitude appears in the acoustic signal parameter curve is the position of the leakage defect section at the joint of adjacent diaphragm wall segments, and the amplitude of the area where distortion or a sudden rise in amplitude appears in the acoustic signal parameter curve represents the degree of the leakage defect section at the joint of adjacent diaphragm wall segments. Thus, it is possible to quickly and effectively determine whether there is a potential leakage at the joint, and at the same time, accurately locate the actual section position in the depth direction of the leakage at the wall segment joint.

[0052] Generally, the retaining walls of a single project often consist of hundreds of segments. By comparing a series of acoustic parameter sample libraries corresponding to the groove joint seams with different construction qualities and water-stop performance levels continuously established during the previous construction process and even in existing similar projects, similarity comparison and analysis can be carried out to effectively judge the actual on-site construction quality of this segment of the wall and provide a certain quantitative basis for the construction quality and water-stop performance after the wall is formed.

[0053] Preferably, in the above-mentioned leakage detection method for the milling joint, lifting the transmitting transducer 4 a certain distance on the wire reel 2 means lifting the transmitting transducer 4 by 10 - 20 cm on the wire reel 2. That is to say, every time the transmitting transducer 4 and the first receiving transducer 5 are lifted by 10 - 20 cm on the wire reel 2, the transmitting transducer 4 emits ultrasonic signals, and the first receiving transducer 5 receives ultrasonic signals. In this way, the detection efficiency can be improved on the premise of ensuring that the ultrasonic signal inspection covers all areas of the joint.

[0054] Embodiment 2

[0055] Please refer to Figures 6 to 11 In this embodiment, the difference from Embodiment 1 is that: two vertically arranged measuring tubes 8 are arranged in each groove section of the retaining wall, namely the first measuring tube 8a and the second measuring tube 8b. The distance between each measuring tube and the adjacent groove joint seam of the retaining wall is 1 / 4 of the length of the groove section of the retaining wall, and the distance between the two measuring tubes is 1 / 2 of the length of the groove section of the retaining wall. The distance from the measuring tube 8 to the inner and outer walls of the groove section of the retaining wall is equal. The transmitting transducer 4 is arranged in the second measuring tube 8b of the first groove section 7a, and the first receiving transducer 5 is arranged in the first measuring tube 8a of the second groove section 7b.

[0056] Preferably, in the above-mentioned leakage detection method for the milling joint, it further includes a second receiving transducer 6. The second receiving transducer 6 is arranged in the first measuring tube 8a of the first groove section 7a. The second receiving transducer 6 moves up and down in the corresponding measuring tube through the corresponding wire reel 2. The measuring tubes where the first receiving transducer 5 and the second receiving transducer 6 are located are respectively at equal distances from the measuring tube where the transmitting transducer 4 is located.

[0057] Preferably, in the above-mentioned leakage detection method for the milling joint, in step 4, the controller 1 is used to start the transmitting transducer 4, the first receiving transducer 5, and the second receiving transducer 6. When the transmitting transducer 4 emits ultrasonic signals, the first receiving transducer 5 and the second receiving transducer 6 receive ultrasonic signals.

[0058] Preferably, in the above method for detecting seepage leakage at the milling joint, in step 4 and step 5, the transmitting transducer 4 is lifted a certain distance by the wire reel 2. According to the water level information of the transmitting transducer 4, the first receiving transducer 5 and the second receiving transducer 6 fed back by the water level gauge 3, the positions of the first receiving transducer 5 and the second receiving transducer 6 are adjusted respectively by the wire reel 2 so that the first receiving transducer 5 and the second receiving transducer 6 reach the depth position where the transmitting transducer 4 is located.

[0059] Preferably, in the above method for detecting seepage leakage at the milling joint, in step 6, steps 4 and 5 are repeated until the transmitting transducer 4, the first receiving transducer 5 and the second receiving transducer 6 reach the ground surface. An acoustic signal parameter curve along the depth direction of the joint area between the first groove section 7a and the second groove section 7b is drawn by the ultrasonic signal received by the first receiving transducer 5 as the first acoustic signal parameter curve, and an acoustic signal parameter curve of the first groove section 7a itself is drawn by the ultrasonic signal received by the second receiving transducer 6 as the second acoustic signal parameter curve 11.

[0060] Preferably, in the above method for detecting seepage leakage at the milling joint, step 7 further includes being able to judge the wall-forming quality of the first groove section 7a itself according to the second acoustic signal parameter curve. The position of the defect section of the first groove section 7a itself is the area where distortion or a sudden rise in amplitude appears in the second acoustic signal parameter curve, and the amplitude of the area where distortion or a sudden rise in amplitude appears in the second acoustic signal parameter curve represents the defect degree of the defect section of the first groove section 7a itself.

[0061] Preferably, in the above method for detecting seepage leakage at the milling joint, step 7 further includes judging the position and degree of the seepage leakage defect section of the joint between adjacent retaining wall groove sections by comparing the first acoustic signal parameter curve and the second acoustic signal parameter curve. When comparing the two, the area where distortion or a sudden rise in amplitude appears in the first acoustic signal parameter curve is the position of the seepage leakage defect section of the joint between adjacent retaining wall groove sections, and the amplitude of the area where distortion or a sudden rise in amplitude appears in the first acoustic signal parameter curve represents the defect degree of the seepage leakage defect section of the joint between adjacent retaining wall groove sections. By comparing the first acoustic signal parameter curve and the second acoustic signal parameter curve, the overall defect degree generated by the milling joint and the position with serious defect hidden dangers can be obtained more intuitively and pertinently.

[0062] In summary, in view of the relative lack of evaluation methods for the construction quality and water-stop performance of the diaphragm wall groove segment joints brought about by the existing milling construction process, the present invention utilizes the acoustic propagation characteristics of ultrasonic waves inside the concrete diaphragm wall, and conducts detection and processing based on the relative change characteristics of acoustic parameters such as acoustic time, wave velocity, wave amplitude, and PSD value during the propagation process, so as to provide a detection scheme for the integrity, uniformity, construction quality, and water-stop performance of the groove segment joints. According to the given quality detection and evaluation results, construction personnel can gradually adjust the construction progress during the trench construction process, and immediately reinforce the mixing piles on-site for some groove segment joints with significantly poor construction quality. At the same time, combined with the results of the later pumping test, based on the acoustic parameter database of each diaphragm wall groove segment in the problem area, the specific location of the problem groove segment joint can be further locked, significantly reducing the scope and volume of the later supplementary reinforcement construction.

[0063] The above description is only a description of the preferred embodiments of the present invention, and does not limit the scope of the present invention in any way. Any changes and modifications made by those of ordinary skill in the art of the present invention based on the above disclosure are within the protection scope of the claims.

Claims

1. A method for detecting water leakage at a milled joint, characterized in that It includes the following steps: Step 1: The measuring tubes are arranged along the perimeter direction of the retaining wall. In the retaining wall trench segments on both sides of the joint of adjacent retaining wall trench segments, one measuring tube is vertically arranged respectively. The distances of the two measuring tubes from the joint are equal, and the distances of the measuring tubes from the inner and outer walls of the retaining wall trench segments are equal. The retaining wall trench segments on both sides of the joint of the adjacent retaining wall trench segments to be detected are the first trench segment and the second trench segment respectively. The measuring tubes are fixed together with the corresponding steel reinforcement cages, and the measuring tubes are lowered into the trench segments together with the corresponding steel reinforcement cages. Subsequently, concrete pouring is completed to form the retaining wall trench segments; Step 2: After the first trench segment and the second trench segment are both poured and reach the required strength, clear water is injected into the measuring tubes on both sides of the joint of the first trench segment and the second trench segment respectively. The transmitting transducer and the first receiving transducer are respectively placed into the measuring tubes on both sides of the joint of the first trench segment and the second trench segment through two wire reels and moved to the bottom of the corresponding measuring tubes. A water level gauge is respectively arranged on the transmitting transducer and the first receiving transducer, and the water level gauges can respectively reflect the water level information of the transmitting transducer and the receiving transducer. The wire reels are respectively connected to the controller and controlled by it, and the controller can receive the water level information measured by each water level gauge; Step 3: According to the water level information of the transmitting transducer and the first receiving transducer fed back by the water level gauges, the positions of the transmitting transducer and the first receiving transducer are adjusted through their respective wire reels to ensure that the transmitting transducer and the first receiving transducer are at the same depth position; Step 4: The transmitting transducer and the first receiving transducer are started through the controller. The transmitting transducer emits ultrasonic signals, and the first receiving transducer receives ultrasonic signals; Step 5: The transmitting transducer is lifted a certain distance through the wire reel. According to the water level information of the transmitting transducer and the first receiving transducer fed back by the water level gauges, the position of the first receiving transducer is adjusted through the wire reel so that the first receiving transducer reaches the depth position where the receiving transducer is located; Step 6: Repeat the operations in Steps 4 and 5 until the transmitting transducer and the first receiving transducer reach the ground surface. The acoustic signal parameter curve along the depth direction of the joint area of the first trench segment and the second trench segment is drawn through the ultrasonic signals received by the first receiving transducer as the first acoustic signal parameter curve; Step 7: Judge the position of the leakage defect section and the degree of the leakage defect of the joint of the adjacent retaining wall trench segments according to the first acoustic signal parameter curve. The area where distortion or the amplitude suddenly rises in the first acoustic signal parameter curve is the position of the leakage defect section of the joint of the adjacent retaining wall trench segments, and the amplitude of the area where distortion or the amplitude suddenly rises in the first acoustic signal parameter curve represents the degree of the leakage defect of the joint of the adjacent retaining wall trench segments; In Step 5, lifting the transmitting transducer a certain distance through the wire reel means lifting the transmitting transducer 10 - 20 cm through the wire reel.

2. The method for detecting water leakage at the milled joint as described in claim 1, wherein By comparing and analyzing the first acoustic signal parameter curve with the normal cross-span acoustic signal parameter curve, judge the position of the leakage defect section and the degree of the leakage defect of the joint of the adjacent retaining wall trench segments.

3. The milling joint leakage detection method according to claim 1, characterized in that Two vertical measuring tubes are arranged in each diaphragm wall groove section, namely the first measuring tube and the second measuring tube. The distance between each measuring tube and the joint of the adjacent diaphragm wall groove section is 1 / 4 of the length of the diaphragm wall groove section. The distance between the two measuring tubes is 1 / 2 of the length of the diaphragm wall groove section. The distances from the measuring tubes to the inner and outer walls of the diaphragm wall groove section are equal. The transmitting transducer is arranged in the second measuring tube of the first groove section, and the first receiving transducer is arranged in the first measuring tube of the second groove section.

4. The method for detecting water leakage at the milling joint according to claim 3, characterized in that, It further includes a second receiving transducer. The second receiving transducer is arranged in the first measuring tube of the first groove section. The second receiving transducer moves up and down in the corresponding measuring tube through the corresponding wire reel. The distances between the measuring tubes where the first receiving transducer and the second receiving transducer are located and the measuring tube where the transmitting transducer is located are equal.

5. The milling joint leakage detection method according to claim 4, characterized in that, In step 4, the transmitting transducer, the first receiving transducer and the second receiving transducer are started through the controller. When the transmitting transducer emits ultrasonic signals, the first receiving transducer and the second receiving transducer receive ultrasonic signals. In step 5, the transmitting transducer is lifted a certain distance by the wire reel. According to the water level information of the transmitting transducer, the first receiving transducer and the second receiving transducer fed back by the water level gauge, the positions of the first receiving transducer and the second receiving transducer are respectively adjusted through the wire reel so that the first receiving transducer and the second receiving transducer reach the depth position where the transmitting transducer is located.

6. The method for detecting seepage and leakage of the milled joint according to claim 5, wherein In step 6, steps 4 and 5 are repeated until the transmitting transducer, the first receiving transducer and the second receiving transducer reach the ground surface. The acoustic signal parameter curve along the depth direction of the joint area between the first groove section and the second groove section is drawn through the ultrasonic signals received by the first receiving transducer as the first acoustic signal parameter curve, and the acoustic signal parameter curve of the first groove section itself is drawn through the ultrasonic signals received by the second receiving transducer as the second acoustic signal parameter curve.

7. The milling joint leakage detection method according to claim 6, wherein, Step 7 further includes being able to judge the wall-forming quality of the first groove section itself according to the second acoustic signal parameter curve.

8. The milling joint leakage detection method according to claim 6, characterized in that, Step 7 further includes judging the position and degree of the leakage defect section of the joint of the adjacent diaphragm wall groove sections by comparing the first acoustic signal parameter curve and the second acoustic signal parameter curve. When comparing the two, the area where distortion or sudden rise in amplitude appears in the first acoustic signal parameter curve is the position of the leakage defect section of the joint of the adjacent diaphragm wall groove sections, and the amplitude of the area where distortion or sudden rise in amplitude appears in the first acoustic signal parameter curve characterizes the defect degree of the leakage defect section of the joint of the adjacent diaphragm wall groove sections.

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