CN-122015684-A - Device and method for monitoring deformation of ice-coated concrete structure through optical fibers

CN122015684ACN 122015684 ACN122015684 ACN 122015684ACN-122015684-A

Abstract

The invention discloses an optical fiber monitoring device and method for deformation of an ice-coated concrete structure, and relates to the technical field of structural health monitoring. The device comprises an air pump, a balancing weight, armored optical fibers, an air cap, an injection type pump pipe and a spray gun, wherein the air pump is connected with the spray gun to blow the optical fibers with the air cap and the balancing weight into a temperature control water pipe reserved in the structure, and the injection type pump pipe is used for grouting and is integrated with a plurality of piezoelectric sensors. During operation, the temperature control water pipe is used as a channel, the prestressed optical fiber with the balancing weight is blown in, the balancing weight is connected through the injection type pump pipe, grouting material is injected, meanwhile, the grouting compactness and interface bonding quality are monitored by the piezoelectric sensor, and the optical fiber demodulator is started to perform long-term deformation and temperature monitoring. The invention realizes the efficient and reliable layout and grouting reinforcement of the sensor in the structure without large-area ice breaking or surface grooving under the severe icing condition, realizes the controllable construction quality and the accurate monitoring of long-term deformation, and has the advantages of good concealment, high sensitivity, strong engineering adaptability and the like.

Inventors

SHAN CHANGXI
HU SHAOWEI
YE YUXIAO
SUN PANXU
ZHAO YAHONG

Assignees

六合郑大科学技术转化中心
郑州大学

Dates

Publication Date: 20260512
Application Date: 20260211

Claims (8)

1. The device for monitoring the deformation of the ice-coated concrete structure by using the optical fiber is characterized by comprising an air pump (11), a balancing weight (12), an armored optical fiber (13), an air cap (14), an injection pump pipe (15) and a spray gun (16); the air pump (11) is connected with the spray gun (16) and is used for blowing the armored optical fiber (13) into the temperature control water pipe (2) reserved in the concrete structure (3), and the spray gun (16) is connected with the temperature control water pipe (2) to form a channel for blowing the armored optical fiber (13) into the concrete structure (3).
2. The device for monitoring the deformation of the ice coated concrete structure according to claim 1, wherein the top of the armored optical fiber (13) is provided with an air cap (14) with a size slightly smaller than the inner diameter of the temperature-controlled water pipe (2) for bringing the armored optical fiber (13) into the temperature-controlled water pipe (2) by means of the air flow of the spray gun (16); The middle part of the armored optical fiber (13) is provided with a plurality of balancing weights (12) which provide prestress for the optical fiber in the process of blowing in the temperature control water pipe (2) and are used for avoiding the optical fiber from loosening and improving the initial monitoring sensitivity.
3. The optical fiber monitoring device for deformation of the ice-coated concrete structure according to claim 1, wherein the balancing weight (12) is positioned at a T-shaped opening of a surface temperature control water pipe (2) of the concrete structure (3); The balancing weight (12) comprises a piezoelectric sensor slot (121), a steel block (122) and a concrete block (123), wherein the piezoelectric sensor slot (121) is a groove at the center of the steel block (122) and is used for being connected with a first piezoelectric sensor (154) on an injection pump pipe (15), the size of the concrete block (123) is slightly smaller than that of an air cap (14), and the property of the adopted concrete material is similar to that of a follow-up grouting material.
4. The device for monitoring deformation of an ice coated concrete structure according to claim 1, wherein the injection pump pipe (15) comprises a pipe barrel (151), and a grouting material discharging port (152) is arranged at the side edge of the end part of the pipe barrel (151) and used for filling the whole temperature controlled water pipe (2) with grouting material along the T-shaped port of the temperature controlled water pipe (2); The end part of the pipe barrel (151) is provided with a magnetic attraction block (153) which can press the first piezoelectric sensor (154) into the piezoelectric sensor slot (121) and is tightly connected with the first piezoelectric sensor, so as to ensure the testing effect of the first piezoelectric sensor (154) on the combination property between the concrete block (123) and the grouting material; A second piezoelectric sensor (155) is arranged in the pipe barrel (151) and used for testing the compactness of grouting material in the pipe barrel (151); The third piezoelectric sensor (156) is arranged in the pipe barrel (151) near the grouting material discharging hole (152) and can be brought into the grouting material when the grouting material is poured into the temperature control water pipe (2) for testing the compactness of the grouting material in the temperature control water pipe (2).
5. The method for monitoring the deformation of the ice-coated concrete structure by using the optical fiber is characterized by comprising the following steps of: S1, checking a temperature control water pipe (2) reserved in a concrete structure in a cold region in a pouring period, ensuring smoothness, removing part of surface ice coating (4), ensuring exposure of a water injection valve (21), checking the T-shaped opening position of the temperature control water pipe (2), setting the position of a balancing weight (12) of an armored optical fiber (3), and installing an air cap (14); s2, connecting a spray gun (16) with the temperature control water pipe (2), blocking a water injection valve (21) which is not arranged on an air blowing path, and blowing the armored optical fiber (13) into the concrete structure (3); S3, opening a water injection valve (21), and connecting an injection pump pipe (15) with the balancing weight (12) along a T-shaped opening of the temperature control water pipe (2); S4, testing equipment connected with the first piezoelectric sensor (154), the second piezoelectric sensor (155) and the third piezoelectric sensor (156), and injecting grouting materials into the temperature control water pipe (2) through an injection pump pipe (15) until the grouting materials are completely filled; S5, starting an optical fiber demodulator, and starting to monitor the deformation of the ice-coated concrete structure (3).
6. The method for monitoring deformation of an ice coated concrete structure according to claim 5, wherein the step S1 is intended to use the existing temperature-controlled water pipe (2) as a sensor channel, and the operations of removing ice coating and grooving on the surface of the structure can be omitted.
7. The method according to claim 5, wherein the step S4 is intended to monitor the whole process of grouting and compaction.
8. The method for monitoring deformation of an iced concrete structure according to claim 5, wherein the step S5 further comprises monitoring temperature changes conducted from the injection pump pipe (15) to the inside of the concrete structure (3) to determine the temperature difference between the inside and the outside.

Description

Device and method for monitoring deformation of ice-coated concrete structure through optical fibers Technical Field The invention belongs to the technical field of structural health monitoring, in particular to a deformation monitoring method of a concrete structure in a cold region, and particularly relates to an optical fiber monitoring device and method for deformation of an ice-coated concrete structure. Background In the research field of long-term service performance and safety monitoring of concrete structures in cold regions, structural deformation monitoring is used as an important state sensing and early warning means, and is important to ensure the durability and safety of infrastructure in severe environments such as ice, snow, freeze thawing and the like. At present, the deformation monitoring of the ice-coated concrete structure mainly depends on the technologies of surface mounting sensors or grooving and embedding sensing elements on the surface layer of the structure. However, these traditional monitoring methods have a series of significant limitations in cold region icing conditions. Especially when dealing with the concrete structure with continuous ice coating in winter, the traditional method has the defects that the ice coating needs to be thoroughly removed before the surface sensor is installed, the engineering is difficult to implement and the surface of the structure under the ice layer is easy to damage, the construction is complex when the sensor is embedded in the surface layer slot, the cross section of the structure can be weakened, and new freeze thawing damage weak points can be introduced. Meanwhile, the existing method is generally difficult to monitor in a long-term, stable and distributed high-sensitivity mode in the structure, and cannot accurately sense the internal deformation development of the concrete under the coupling action of temperature stress and ice coating load, so that the structure safety state is in a passive and hysteresis judgment situation, and the reliability, instantaneity and engineering applicability of the concrete structure health monitoring in a cold region are greatly limited. According to the inspection, the disclosed deformation monitoring methods related to the concrete structure in the cold region are not few, but the optical fiber monitoring method for the deformation of the ice-coated concrete structure is not inspected. The relevant schemes now partially published are listed: The China patent with publication number CN120995641A discloses a method, a system, equipment and a medium for evaluating the icing failure of a reinforced concrete electric pole, and the actual stress state of the electric pole can be accurately predicted by analyzing the stress distribution and potential cracks of the electric pole under different loads. The Chinese patent with publication number of CN120649692A discloses an active repair device and method for microcracks on the surface of a concrete structure of a covered ice, and the problems that microcracks on the surface of the concrete structure of the covered ice are difficult to find and repair in time can be realized by combining a distributed optical fiber sensing technology and the microcrack repair device. However, the above technology does not mention a method for monitoring deformation of an ice coated concrete structure. Therefore, the current urgent need is an internal deformation monitoring method of the ice-coated concrete structure, which can realize the whole process from the arrangement of the optical fiber sensor, grouting consolidation to data acquisition and interpretation, and realize the accurate, directional capture and long-term stable transmission of the internal deformation information of the structure by the sensor. Disclosure of Invention The invention aims to provide a method for monitoring internal deformation of an ice-coated concrete structure, which aims to solve the problems in the background technology. In order to achieve the above purpose, the present invention provides the following technical solutions: The device is characterized by comprising an air pump, a balancing weight, armored optical fibers, an air cap, an injection type pump pipe and a spray gun. Preferably, the device further comprises an integrated control unit, and the air pump, the spray gun and the injection pump pipe are electrically connected with the control unit and used for realizing automatic program control of the optical fiber blowing and grouting process. Preferably, the connection interface of the spray gun and the temperature control water pipe is a quick-connection type sealing joint, and the quick-connection type sealing joint is suitable for standard temperature control water pipe ports with different pipe diameters. Preferably, the device is integrally integrated in a portable engineering box, and a special storage bin for armored optical fibers, balancing weights and pump pipes is arranged