CN111270713A - Ultrasonic thickness measurement probe mounting structure, tunnel immersed tube and mounting method - Google Patents
Ultrasonic thickness measurement probe mounting structure, tunnel immersed tube and mounting method Download PDFInfo
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- CN111270713A CN111270713A CN202010084210.9A CN202010084210A CN111270713A CN 111270713 A CN111270713 A CN 111270713A CN 202010084210 A CN202010084210 A CN 202010084210A CN 111270713 A CN111270713 A CN 111270713A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/063—Tunnels submerged into, or built in, open water
- E02D29/073—Tunnels or shuttering therefor assembled from sections individually sunk onto, or laid on, the water-bed, e.g. in a preformed trench
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/10—Miscellaneous comprising sensor means
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)
Abstract
The invention discloses an ultrasonic thickness measuring probe mounting structure, a tunnel immersed tube and a mounting method. The ultrasonic thickness measuring probe mounting structure comprises a liner tube, an ultrasonic probe and a fixing piece, wherein the liner tube is arranged in a solid structure layer, one end of the liner tube is fixed on a measured metal layer in a sealing mode, the other end of the liner tube is provided with a sealing piece for sealing the inner space of the liner tube, the sealing piece is located on two sides of the solid structure layer respectively with the measured metal layer, the ultrasonic probe is arranged at one end, close to the measured metal layer, of the liner tube, the ultrasonic probe is fixed at one end of the fixing piece, the fixing piece is fixed in the liner tube, and the ultrasonic probe is connected with ultrasonic equipment through an outgoing line. The invention realizes the quantitative measurement of the outer wall thickness of the immersed tube steel shell by using ultrasonic waves, monitors the thinning degree of the immersed tube steel shell after being corroded in the service process, predicts the residual service life of the immersed tube steel shell, has easy operation of the installation monitoring method, prolongs the service life, reduces the cost and has accurate and reliable measurement data.
Description
Technical Field
The invention relates to the technical field of metal corrosion prevention, in particular to an ultrasonic thickness measurement probe mounting structure, a tunnel immersed tube and a mounting method.
Background
At present, various cathodic protection monitoring probes in the field of maritime work only can qualitatively evaluate the cathodic protection state of a protected body, but cannot quantitatively detect the corrosion state and the corrosion amount of a steel structure, cannot accurately measure the corrosion thickness and the residual thickness, cannot evaluate the residual service life, and cannot judge and early warn the limit state of the steel structure.
In a seawater corrosion environment, the corrosion resistance of the steel plate is poor, although the steel plate is subjected to corrosion protection by adopting an anticorrosive coating and a sacrificial anode method, the steel plate is in a severe marine environment for a long time, under the combined action of various physical and chemical factors, the corrosion state of the steel plate in a long service life is continuously changed, and the corrosion protection state of the steel plate needs to be monitored. For a steel shell concrete combined structure, the steel shell can be used as a concrete pouring template and can also be used as an outer waterproof layer, and the corrosion thickness, the corrosion rate and the residual thickness of the immersed tube steel shell are extremely important for the evaluation of the health state and the design of subsequent remedial measures. At present, a monitoring system is added in a tunnel to monitor the corrosion protection state of the tunnel in the ocean engineering field. And arranging probes of a plurality of monitoring devices at a plurality of typical positions where the steel plate is in contact with the seawater to monitor parameters of the typical positions. The monitoring device can be a reference electrode, a pH meter, a temperature sensor, an oxygen content sensor and the like. However, the existing anticorrosion detection and monitoring methods for tunnel immersed tube steel shells, ships, semi-submersible type ocean platforms, storage tanks and the like still have the following disadvantages:
1. the artificial diving is used for checking the corrosion prevention state, so that the cost is high and the operation is difficult;
2. the submarine tunnel is buried with gravels, the steel shell on the surface and the probe of the monitoring device arranged on the surface are all buried, and the probe cannot be replaced once being damaged.
Disclosure of Invention
Aiming at the problems, the invention provides an ultrasonic thickness measuring probe mounting structure, a tunnel immersed tube and a mounting method. The technical means adopted by the invention are as follows:
the utility model provides an supersound thickness measuring probe mounting structure, includes bushing pipe, ultrasonic probe and mounting, the bushing pipe sets up in solid structure layer, the one end of bushing pipe is sealed to be fixed in on the measured metal layer of solid structure layer one side, the other end of bushing pipe is equipped with the messenger the inclosed sealing member of inner space of bushing pipe, the sealing member with it is located the both sides of solid structure layer respectively to be surveyed the metal layer, ultrasonic probe sets up the one end that is close to the measured metal layer in the bushing pipe, ultrasonic probe is fixed in the one end of mounting, the mounting is fixed in the bushing pipe, ultrasonic probe links to each other with the lead-out wire.
Furthermore, one end, far away from the measured metal layer, of the liner tube is provided with a first flange fixed in a sealing manner between the liner tubes, a second flange is fixed on the first flange, the fixing part is of a tubular structure and is fixed in the liner tube through the second flange, the outgoing line is led out through the second flange and the sealing cover, the outgoing line and the sealing cover are sealed, the sealing part is a sealing cover, the sealing cover is fixed on the first flange in a sealing manner, and the second flange is arranged in the sealing cover.
Further, the second flange plate is mutually abutted to the fixing piece, the fixing piece is locked in the lining pipe, the sealing cover is provided with an observation window, and a watertight gasket is arranged between the sealing cover and the first flange plate.
Further, the solid structure layer is a concrete layer, the metal layer to be detected is a steel layer, and the liner tube is welded and fixed on the metal layer to be detected.
Furthermore, one side of the concrete layer is also provided with a second metal layer, the metal layer to be detected and the second metal layer are respectively positioned at two sides of the concrete layer, the second metal layer is provided with a through hole, and the liner tube is hermetically fixed at the through hole of the second metal layer, so that the inner space of the liner tube is communicated with the through hole.
The tunnel immersed tube comprises a concrete layer, an external metal shell arranged on the concrete layer and the ultrasonic thickness measuring probe mounting structure, wherein the concrete layer of the tunnel immersed tube is a solid structural layer, and the external metal shell of the tunnel immersed tube is a measured metal layer.
Further, the tunnel immersed tube further comprises an inner metal shell arranged on the inner side of the concrete layer, a through hole is formed in the inner metal shell, and the end portion of the liner tube is fixed in the through hole in a sealing mode, so that the inner space of the liner tube is communicated with the through hole.
The invention relates to an ultrasonic thickness measuring probe mounting method, which comprises the following steps:
a. sealing and fixing the liner pipe on one side of the measured metal layer facing the solid structural layer, and presetting the liner pipe in the solid structural layer;
b. fixing the ultrasonic probe at the end part of the fixing piece, inserting the fixing piece into the lining pipe, pushing the ultrasonic probe to one side of the measured metal layer facing the solid structure layer, fixing the fixing piece, and installing the sealing piece.
Further, in the step a, the metal layer to be detected is an external metal shell of the immersed tube, a through hole is formed in the internal metal shell of the immersed tube, one end of the liner tube is fixed on the inner side of the external metal shell in a watertight manner, the other end of the liner tube is fixed at the through hole of the internal metal shell in a watertight manner, concrete is poured between the external metal shell and the internal metal shell, and the concrete is solidified into a solid structure layer; and b, fixing the ultrasonic probe at the end part of the tubular fixing piece through threads, coating a coupling agent on the ultrasonic probe, inserting the fixing piece into the lining pipe, pushing the ultrasonic probe to one side of the measured metal layer facing the solid structure layer, penetrating the outgoing line through the second flange plate, installing the second flange plate on the first flange plate, locking the fixing piece, penetrating the outgoing line through the sealing cover, and sealing and fixing the sealing cover on the first flange plate.
Compared with the prior art, the ultrasonic thickness measuring probe mounting structure, the tunnel immersed tube and the mounting method have the following advantages:
1. the method has the advantages that the thickness of the outer wall of the immersed tube steel shell is quantitatively measured by utilizing ultrasonic waves, the thinning degree of the immersed tube steel shell after being corroded in the service process is monitored, the remaining service life of the immersed tube steel shell is predicted, the outer steel shell does not need to be provided with a hole, a steel shell thickness detection probe can directly reach the inner surface of the outer wall of the steel shell in a pushing mode, and the water tightness is completely ensured;
2. the ultrasonic probe is arranged on the inner wall of the solid structure layer, is not easy to damage, prolongs the service life and reduces the cost;
3. the positions of the key points are regularly detected, the thickness data of the steel shell most directly and visually reflect the health state, and the measured data are accurate and reliable;
4. the detection data is input into a database, the health state of the steel shell is evaluated and analyzed, indexes are given, and the measuring method is easy to operate.
Drawings
Fig. 1 is a schematic structural diagram of an ultrasonic thickness measurement probe mounting structure according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a tunnel sinking pipe according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of an implementation state of the embodiment of the invention.
Detailed Description
As shown in fig. 1, an ultrasonic thickness measuring probe mounting structure comprises a liner tube 1, an ultrasonic probe 2 and a fixing piece 3, the liner tube 1 is arranged in the solid structure layer 4, one end of the liner tube 1 is hermetically fixed on the measured metal layer 5 at one side of the solid structure layer 4, the other end of the liner tube 1 is provided with a sealing element 6 for sealing the inner space of the liner tube 1, the sealing element 6 and the metal layer 5 to be detected are respectively positioned at two sides of the solid structure layer 4, the ultrasonic probe 2 is arranged at one end of the liner tube 1 close to the metal layer 5 to be detected, the ultrasonic probe 2 is fixed at one end of the fixing piece 3, the fixing piece 3 is fixed in the liner tube 1, the ultrasonic probe 2 is connected with an outgoing line 7, the outgoing line 7 is connected with an ultrasonic device 13 when being used for monitoring, and a coupling agent is filled between the ultrasonic probe 2 and the metal layer 5 to be detected. The principle of ultrasonic thickness measurement is similar to the principle of optical wave measurement, the thickness measurement is carried out by generating ultrasonic pulse by an ultrasonic probe, transmitting the ultrasonic pulse to a measured object through a coupling agent, reflecting a part of ultrasonic signal by the bottom surface of the object when the ultrasonic pulse reaches a material boundary surface through the measured object, receiving echo reflected by the bottom surface of the measured object by the probe, accurately measuring the round-trip time of the ultrasonic wave in the material, calculating the thickness value according to the following formula, and displaying the calculation result. Based on the principle, the thickness monitoring system for the steel shell can realize quantitative measurement of the thickness of the outer wall of the immersed tube steel shell by utilizing ultrasonic waves, monitor the thinning degree of the immersed tube steel shell after being corroded in the service process, and predict the residual service life of the immersed tube steel shell.
One end of liner tube 1, which is far away from measured metal layer 5, is equipped with and sealed fixed first ring flange 8 between the liner tube 1, be fixed with second ring flange 9 on the first ring flange 8, mounting 3 is the tubular structure, mounting 3 is fixed in the liner tube through second ring flange 9, lead-out wire 7 passes second ring flange 9 and sealed lid and draws forth, it is sealed between lead-out wire 7 and the sealed lid, sealing member 6 is sealed lid, sealed lid is sealed to be fixed on the first ring flange 8, second ring flange 9 set up in the sealed lid. The second flange plate 9 is abutted against the fixing part 3, the fixing part 3 is locked in the lining pipe, the sealing cover is provided with an observation window 10, and a watertight gasket 11 is arranged between the sealing cover and the first flange plate 8.
The solid structure layer 4 is a concrete layer, the metal layer 5 to be detected is a steel layer, and the liner tube 1 is welded and fixed on the metal layer 4 to be detected. The concrete layer is characterized in that a second metal layer 12 is further arranged on one side of the concrete layer, the metal layer 5 to be detected and the second metal layer 12 are respectively located on two sides of the concrete layer, a through hole is formed in the second metal layer 12, and the lining pipe 1 is fixed at the through hole of the second metal layer 12 in a sealing mode, so that the inner space of the lining pipe is communicated with the through hole. For tunnel sinkers, the second metal layer is the inner metal shell of the sinker.
This embodiment supersound thickness measurement probe mounting structure utilize the ultrasonic wave to realize the quantitative measurement to immersed tube steel casing outer wall thickness, monitor its attenuate degree after receiving the corruption in the in-service process, predict its remaining life, the difficult operational situation of monitoring of specially adapted surveyed metal level one side, will install measurement operation and be surveyed the metal level and set up respectively in the both sides of solid structure layer, realize the installation and the monitoring operation to the monitoring devices of being surveyed the metal level of the difficult one side of operating in the one side of easy operation more, reduce the operation degree of difficulty, simultaneously reduce cost, extension ultrasonic probe's life.
As shown in fig. 2, the tunnel immersed tube comprises a concrete layer and an external metal shell arranged on the concrete layer, and further comprises the ultrasonic thickness measurement probe mounting structure 100, wherein the concrete layer of the tunnel immersed tube is the solid structural layer 4, and the external metal shell of the tunnel immersed tube is the measured metal layer 5. The tunnel immersed tube further comprises an inner metal shell arranged on the inner side of the concrete layer, a through hole is formed in the inner metal shell 12, and the end portion of the lining tube is fixed in the through hole in a sealing mode, so that the inner space of the lining tube 1 is communicated with the through hole. In this embodiment, the liner tube 1 is hermetically welded at its two ends to the outer metal shell and the inner metal shell, respectively.
An ultrasonic thickness measuring probe installation method comprises the following steps:
a. sealing and fixing the liner tube 1 on the side of the metal layer 5 to be tested, which faces the solid structural layer 4, and pre-placing the liner tube in the solid structural layer 4;
b. fixing an ultrasonic probe 2 at the end part of a fixing piece 3, inserting the fixing piece 3 into a liner tube 2, pushing the ultrasonic probe 2 to one side of a measured metal layer 5 facing a solid structure layer 4, fixing the fixing piece 3, and installing a sealing piece 6;
as shown in fig. 3, during monitoring, the outgoing line 7 is connected with the ultrasonic device 13 for detection, data are collected by monitoring personnel, and the data are input into a database and processed by the processing system 14; or the outgoing line 7 is connected with the ultrasonic device 13, the ultrasonic device is directly connected with the database, and the data is transmitted to the processing system in real time for real-time monitoring.
In the step a, the metal layer 5 to be detected is an external metal shell of the immersed tube, when the immersed tube is installed, a through hole is formed in the internal metal shell of the immersed tube, one end of the liner tube 1 is fixed on the inner side of the external metal shell in a watertight manner, the other end of the liner tube 1 is fixed at the through hole of the internal metal shell in a watertight manner, concrete is poured between the external metal shell and the internal metal shell, the concrete is solidified into a solid structure layer 4, the internal metal shell of the immersed tube can be simultaneously used as an internal mold for pouring the immersed tube, and the liner tube 1 is fixed at the through holes of the external metal shell and the internal metal shell. In the step b, the ultrasonic probe 2 is fixed at the end part of the tubular fixing piece 3 through threads, the ultrasonic probe 2 is coated with a coupling agent, the fixing piece 3 is inserted into the liner, the ultrasonic probe 2 is pushed to one side of the measured metal layer 5, which faces the solid structure layer 4, the outgoing line 7 penetrates through the second flange 9, the second flange 9 is installed on the first flange 8, the fixing piece 3 is locked, and the outgoing line 7 penetrates through the sealing cover and hermetically fixes the sealing cover on the first flange 8.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (9)
1. The utility model provides an supersound thickness measuring probe mounting structure which characterized in that: including bushing pipe, ultrasonic probe and mounting, the bushing pipe sets up in solid structure layer, the one end of bushing pipe is sealed to be fixed in on the measured metal level of solid structure layer one side, the other end of bushing pipe is equipped with the messenger the inclosed sealing member of inner space of bushing pipe, the sealing member with it is located the both sides of solid structure layer respectively to be surveyed the metal level, ultrasonic probe sets up in the bushing pipe and is close to the one end of being surveyed the metal level, ultrasonic probe is fixed in the one end of mounting, the mounting is fixed in the bushing pipe, ultrasonic probe links to each other with the lead-out wire.
2. The ultrasonic thickness measuring probe mounting structure according to claim 1, wherein: one end of the liner tube, which is far away from the metal layer to be tested, is provided with a first flange plate fixed in a sealing manner between the liner tube, a second flange plate is fixed on the first flange plate, the fixing part is of a tubular structure and is fixed in the liner tube through the second flange plate, the outgoing line is led out through the second flange plate and the sealing cover, the outgoing line and the sealing cover are sealed, the sealing part is a sealing cover, the sealing cover is fixed on the first flange plate in a sealing manner, and the second flange plate is arranged in the sealing cover.
3. The ultrasonic thickness measuring probe mounting structure according to claim 2, wherein: the second flange plate is mutually abutted to the fixing part, the fixing part is locked in the lining pipe, the sealing cover is provided with an observation window, and a watertight gasket is arranged between the sealing cover and the first flange plate.
4. The ultrasonic thickness measuring probe mounting structure according to any one of claims 1 to 3, wherein: the solid structure layer is a concrete layer, the metal layer to be detected is a steel layer, and the liner tube is welded and fixed on the metal layer to be detected.
5. The ultrasonic thickness measuring probe mounting structure according to claim 4, wherein: the concrete layer is characterized in that a second metal layer is further arranged on one side of the concrete layer, the metal layer to be detected and the second metal layer are respectively located on two sides of the concrete layer, a through hole is formed in the second metal layer, and the lining pipe is fixed at the through hole of the second metal layer in a sealing mode, so that the inner space of the lining pipe is communicated with the through hole.
6. The utility model provides a tunnel immersed tube, includes concrete layer and sets up in concrete layer's outside metal-back, its characterized in that: the ultrasonic thickness measuring probe installation structure comprising any one of claims 1 to 5, wherein the concrete layer of the tunnel immersed tube is the solid structural layer, and the outer metal shell of the tunnel immersed tube is the measured metal layer.
7. The tunnel sink of claim 6, wherein: the tunnel immersed tube further comprises an inner metal shell arranged on the inner side of the concrete layer, a through hole is formed in the inner metal shell, and the end portion of the lining tube is fixed in the through hole in a sealing mode, so that the inner space of the lining tube is communicated with the through hole.
8. An ultrasonic thickness measuring probe installation method according to any one of claims 1 to 7, characterized in that: the method comprises the following steps:
a. sealing and fixing the liner pipe on one side of the measured metal layer facing the solid structural layer, and presetting the liner pipe in the solid structural layer;
b. fixing the ultrasonic probe at the end part of the fixing piece, inserting the fixing piece into the lining pipe, pushing the ultrasonic probe to one side of the measured metal layer facing the solid structure layer, fixing the fixing piece, and installing the sealing piece.
9. The ultrasonic thickness measuring probe installation method of claim 8, wherein:
in the step a, the metal layer to be detected is an external metal shell of the immersed tube, a through hole is formed in the internal metal shell of the immersed tube, one end of the liner tube is fixed on the inner side of the external metal shell in a watertight manner, the other end of the liner tube is fixed at the through hole of the internal metal shell in a watertight manner, concrete is poured between the external metal shell and the internal metal shell, and the concrete is solidified into a solid structure layer;
and b, fixing the ultrasonic probe at the end part of the tubular fixing piece through threads, coating a coupling agent on the ultrasonic probe, inserting the fixing piece into the lining pipe, pushing the ultrasonic probe to one side of the measured metal layer facing the solid structure layer, penetrating the outgoing line through the second flange plate, installing the second flange plate on the first flange plate, locking the fixing piece, penetrating the outgoing line through the sealing cover, and sealing and fixing the sealing cover on the first flange plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010084210.9A CN111270713A (en) | 2020-02-10 | 2020-02-10 | Ultrasonic thickness measurement probe mounting structure, tunnel immersed tube and mounting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010084210.9A CN111270713A (en) | 2020-02-10 | 2020-02-10 | Ultrasonic thickness measurement probe mounting structure, tunnel immersed tube and mounting method |
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| CN111270713A true CN111270713A (en) | 2020-06-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010084210.9A Pending CN111270713A (en) | 2020-02-10 | 2020-02-10 | Ultrasonic thickness measurement probe mounting structure, tunnel immersed tube and mounting method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115217152A (en) * | 2022-07-29 | 2022-10-21 | 招商局重庆交通科研设计院有限公司 | Method and device for predicting opening and closing deformation of immersed tunnel pipe joint |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105066918A (en) * | 2015-08-10 | 2015-11-18 | 上海应用技术学院 | Ultrasonic underwater target thickness measuring system and thickness measuring method |
| CN205530349U (en) * | 2016-01-27 | 2016-08-31 | 中交公路规划设计院有限公司 | Immersed tube is tube coupling box hat concrete integrated configuration for tunnel |
| CN110118721A (en) * | 2019-05-31 | 2019-08-13 | 大连科迈尔防腐科技有限公司 | A kind of replacing options in place and more changing device in place of etch state monitoring device |
-
2020
- 2020-02-10 CN CN202010084210.9A patent/CN111270713A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105066918A (en) * | 2015-08-10 | 2015-11-18 | 上海应用技术学院 | Ultrasonic underwater target thickness measuring system and thickness measuring method |
| CN205530349U (en) * | 2016-01-27 | 2016-08-31 | 中交公路规划设计院有限公司 | Immersed tube is tube coupling box hat concrete integrated configuration for tunnel |
| CN110118721A (en) * | 2019-05-31 | 2019-08-13 | 大连科迈尔防腐科技有限公司 | A kind of replacing options in place and more changing device in place of etch state monitoring device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115217152A (en) * | 2022-07-29 | 2022-10-21 | 招商局重庆交通科研设计院有限公司 | Method and device for predicting opening and closing deformation of immersed tunnel pipe joint |
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Application publication date: 20200612 |