Concrete structure chloride ion monitoring system

Abstract

The invention discloses a concrete structure chloride ion monitoring system, and belongs to the technical field of concrete structure monitoring, the concrete structure chloride ion monitoring system comprises a spiral sleeve, the spiral sleeve is provided with a plurality of through holes communicated with the interior of the spiral sleeve, and the through holes are arranged at equal intervals along the spiral direction of the spiral sleeve; the spiral sleeve is fixedly connected with a connecting pipe sleeve coaxial with the through hole, the through hole penetrates through the connecting pipe sleeve, a transmission optical fiber is installed in the spiral sleeve, one end of the transmission optical fiber extends out of the opening end of the spiral sleeve to be connected with main control equipment, and an optical fiber connector used for being electrically connected with the transmission optical fiber is fixedly installed in the connecting pipe sleeve. The outer wall of the connecting pipe sleeve is in threaded connection with a plugging cover capable of sealing the connecting pipe sleeve, and the plugging cover is provided with a chloride ion sensor which is connected with the optical fiber connector in an inserted mode through an RS-485 interface. Chloride ion penetration of different depths in the inner circumferential direction and the axial direction of the concrete structure is monitored through the spiral sleeve, and the stability of the concrete structure in the long-term monitoring process is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of concrete structure monitoring, and in particular relates to a chloride ion monitoring system for a concrete structure. Background Art

[0002] Coastal reinforced concrete structures are located in harsh corrosive environments such as seawater and marine climate. There are a large number of chloride ions that are corrosive to steel bars. The process of chloride ions penetrating into concrete is gradual from the surface to the inside. When chloride ions penetrate into the inner layer of the reinforced concrete structure where the steel bars are located and reach the critical concentration of chloride ions, they will corrode the steel bars, thereby affecting the durability of the concrete structure. Therefore, it is necessary to monitor the chloride ion concentration of the concrete structure in real time.

[0003] In the prior art, a chloride ion penetration status monitoring device and a monitoring method in concrete are disclosed in the announcement number CN113376061B. The annular fixing frame for fixing the optical fiber sensor is placed in the steel structure of the pile body, and the optical fiber sensors are connected one by one by wires through the optical fiber signal acquisition device to achieve all-round detection. The above technology requires setting a fixing frame and a connecting rod in the concrete structure, and setting multiple sensors circumferentially near the center of the pile body. The circuit is complicated and affects the stability of the concrete structure during use.

[0004] Therefore, it is necessary to propose a chloride ion monitoring system for concrete structures to solve the above problems. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a concrete structure chloride ion monitoring system for solving the problems in the prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] The invention provides a chloride ion monitoring system for a concrete structure, comprising a spiral sleeve, wherein the spiral sleeve is provided with a plurality of through holes communicating with the interior of the spiral sleeve, the plurality of through holes are arranged at equal intervals along the spiral direction of the spiral sleeve, the spiral sleeve is fixedly connected with a connecting sleeve coaxially arranged with the through hole, the through hole penetrates the connecting sleeve, one end of the spiral sleeve is closed, a transmission optical fiber is installed in the spiral sleeve, one end of the transmission optical fiber extends out of an open end of the spiral sleeve and is connected with a main control device, an optical fiber connector for being electrically connected to the transmission optical fiber is fixedly installed in the connecting sleeve, a blocking cover capable of sealing the connecting sleeve is threadedly connected to the outer wall of the connecting sleeve, an RS-485 interface capable of being plugged with the optical fiber connector is rotatably connected in the blocking cover, a chloride ion sensor electrically connected to the RS-495 interface is fixedly installed on the blocking cover, a plurality of chloride ion sensors are electrically connected to the main control device through the transmission optical fiber, the main control device allocates a unique Modbus address to each chloride ion sensor, and sends an instruction to specify the chloride ion sensor address through the Modbus protocol to read the measurement data of each sensor.

[0008] Furthermore, the spiral sleeve is in a truncated cone shape, and the top diameter of the spiral sleeve is smaller than the bottom diameter of the spiral sleeve.

[0009] Furthermore, the outer wall of the connecting sleeve is provided with an external thread section, the diameter of the external thread section is smaller than the diameter of the connecting pipe, a first sealing ring is sleeved on the external thread section, and the sealing cover is threadedly connected to the external thread section so that the first sealing ring can be clamped between the connecting sleeve and the sealing cover.

[0010] Furthermore, a second sealing ring is arranged inside the blocking cover, and the blocking cover is threadedly connected to the external thread section so that the second sealing ring can be clamped between the external thread section and the inner wall of the blocking cover.

[0011] Furthermore, the spiral sleeve is provided with a plurality of injection holes corresponding one to one with the through holes.

[0012] Further, the monitoring method of the concrete structure chloride ion monitoring system comprises the following steps:

[0013] S1, assembling the spiral sleeve: installing the transmission optical fiber in the spiral sleeve, and then installing the optical fiber connector in the connecting sleeve, and connecting the optical fiber connector to the transmission optical fiber, and then injecting epoxy resin into the spiral sleeve through the injection hole to fix the transmission optical fiber and the optical fiber connector and seal the injection hole, and then connecting the sealing cover with the connecting sleeve through a threaded connection so that the chloride ion sensor is connected to the optical fiber connector through the RS-485 interface;

[0014] S2, sensor initialization and address allocation: Assign a unique Modbus address to each chloride ion sensor on the master device, send an initialization command through the master device, check the connection status of each sensor, and ensure that all sensors can communicate normally;

[0015] S3, installing the spiral sleeve: fixing the assembled spiral sleeve at a preset height in the pile body by binding, wherein the spiral sleeve 1 is sleeved on the steel cage in the pile body, and recording the radial distance and axial height between each sensor and the outer wall of the pile body;

[0016] S4, real-time monitoring and data collection: the main control device sends instructions regularly through the Modbus protocol to read the chloride ion concentration data measured by each chloride ion sensor and record the timestamp of data collection;

[0017] S5, generating a chloride ion concentration distribution diagram and a permeation rate curve according to the address of each chloride ion sensor and its corresponding radial distance and axial height.

[0018] The beneficial effects of the present invention are:

[0019] The present invention realizes monitoring of chloride ion penetration in the circumferential direction and at different axial depths in a concrete structure through the design of a spiral sleeve, thereby ensuring the stability of the concrete structure during long-term monitoring, and multiple chloride ion sensors are connected in series on the same transmission optical fiber, without the need to set multiple transmission optical fibers, thereby reducing the diameter of the spiral sleeve; at the same time, the spiral sleeve has an axial deformation function due to its spiral design, and the tail ends of the spiral sleeve can be fixed at different heights in the concrete structure according to the monitoring depth; and the transmission optical fiber extends out of the open end of the spiral sleeve and is connected to a main control device, thereby reducing the complexity of the external circuit of the concrete; and the blocking cover is threadedly connected to the connecting pipe sleeve, thereby ensuring the stability of the chloride ion sensor after installation, thereby avoiding the spiral sleeve being covered during the concrete pouring process or the position of the chloride ion sensor being offset during the concrete vibrating process.

[0020] Other advantages, objectives and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art may be taught from the practice of the present invention. The objectives and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration:

[0022] Figure 1 A schematic diagram of the spiral casing structure according to an embodiment of the present invention;

[0023] Figure 2 This is a cross-sectional view of the installation of a chloride ion sensor according to an embodiment of the present invention.

[0024] The markings in the accompanying drawings are as follows: spiral sleeve 1, through hole 101, injection hole 102, connecting sleeve 2, external thread section 201, first sealing ring 202, transmission optical fiber 3, optical fiber connector 4, sealing cover 5, second sealing ring 501, RS-485 interface 6, chloride ion sensor 7. DETAILED DESCRIPTION

[0025] like Figures 1-2 As shown, the present invention provides a chloride ion monitoring system for a concrete structure, comprising: a spiral sleeve 1, a plurality of through holes 101 communicating with the interior of the spiral sleeve 1 are arranged on the spiral sleeve 1, and the plurality of through holes 101 are arranged at equal intervals along the spiral direction of the spiral sleeve 1, a connecting sleeve 2 coaxially arranged with the through hole 101 is fixedly connected to the spiral sleeve 1, the through hole 101 is arranged through the connecting sleeve 2, one end of the spiral sleeve 1 is closed, a transmission optical fiber 3 is installed in the spiral sleeve 1, one end of the transmission optical fiber 3 extends out of the open end of the spiral sleeve 1 and is connected to a main control device, an optical fiber connector 4 for electrically connecting to the transmission optical fiber 3 is fixedly installed in the connecting sleeve 2, a blocking cover 5 capable of closing the connecting sleeve 2 is threadedly connected to the outer wall of the connecting sleeve 2, an RS-485 interface 6 capable of plugging with the optical fiber connector 4 is rotatably connected in the blocking cover 5, and a chloride ion sensor 7 electrically connected to the RS-485 interface 6 is fixedly installed on the blocking cover 5.

[0026] In this solution, when installing the spiral sleeve 1, the spiral sleeve 1 is pre-installed on the vertical reinforcement of the concrete structure by binding and fixing, and then concrete is poured to form a reinforced concrete structure, so that the spiral sleeve 1 acts as a spiral reinforcement and is arranged in the concrete structure. On the one hand, the stability of the concrete structure is ensured, and on the other hand, it is convenient for the installation of the chloride ion sensor 7. The multiple chloride ion sensors 7 are electrically connected to the main control device through the same transmission optical fiber 3. Before installing the chloride ion sensor 7, a unique Modbus address is assigned to each chloride ion sensor 7 through the main control device. The main control device sends instructions through the Modbus protocol to specify the address of the chloride ion sensor 7 and read the measurement data of each sensor.

[0027] This solution uses the design of the spiral sleeve 1 to monitor the chloride ion penetration in the circumferential direction and at different axial depths in the concrete structure, thereby ensuring the stability of the concrete structure during long-term monitoring. In addition, multiple chloride ion sensors 7 are connected in series on the same transmission optical fiber 3, without the need to set up multiple transmission optical fibers, thereby reducing the diameter of the spiral sleeve 1. At the same time, the spiral sleeve 1 has an axial deformation function due to its spiral design, and the two ends of the spiral sleeve 1 can be fixed at different heights in the concrete structure according to the monitoring depth. The transmission optical fiber 3 extends out of the open end of the spiral sleeve 1 and is connected to the main control device, thereby reducing the complexity of the external circuit of the concrete. The sealing cover 5 is threadedly connected to the connecting pipe sleeve 2 to ensure the stability of the chloride ion sensor 7 after installation, thereby avoiding the spiral sleeve 1 being covered during the concrete pouring process or the position of the chloride ion sensor 7 being offset during the concrete vibration process.

[0028] In one embodiment of the present invention, the spiral casing 1 is truncated cone-shaped, and the top diameter of the spiral casing 1 is smaller than the bottom diameter of the spiral casing 1. The circumferential diameters of the spiral casing 1 at different depths are made inconsistent. Since the penetration of chloride ions is positively correlated with pressure, when monitoring concrete structures below sea level in coastal areas, the chloride ion sensor 7 near the bottom side of the spiral casing 1 will first detect the penetration of chloride ions, that is, the safety threshold of chloride ion detection is improved. At the same time, since the diameters of the spiral casing 1 at different depths are inconsistent, the installation height of each chloride ion sensor 7 and the radial distance from the outer wall of the pile body are inconsistent, thereby improving the monitoring range, which is conducive to drawing a chloride ion concentration distribution diagram and a penetration rate curve of chloride ion concentration changing with depth and radial distance.

[0029] In one embodiment of the present invention, an external thread section 201 is provided on the outer wall of the connecting sleeve 2, and the diameter of the external thread section 201 is smaller than the diameter of the connecting pipe 2. A first sealing ring 202 is sleeved on the external thread section 201. The threaded connection between the sealing cover 5 and the external thread section 201 enables the first sealing ring 202 to be clamped between the connecting sleeve 2 and the sealing cover 5 to ensure the sealing of the spiral sleeve 1 and prevent concrete from flowing into the spiral sleeve 1 during pouring and causing damage to the transmission optical fiber 3.

[0030] In one embodiment of the present invention, a second sealing ring 501 is provided in the blocking cap 5 , and the blocking cap 5 is threadedly connected to the external thread section 201 so that the second sealing ring 501 can be clamped between the external thread section 201 and the inner wall of the blocking cap 5 , so as to further improve the sealing performance of the threaded sleeve 1 .

[0031] In one embodiment of the present invention, the spiral sleeve 1 is provided with a plurality of injection holes 102 corresponding to the through holes 101, and the injection holes 102 are connected to the interior of the spiral sleeve 1. After the transmission optical fiber 3 is installed in the spiral sleeve 1, the optical fiber connector 4 is installed in the connecting sleeve 2, and the optical fiber connector 4 is connected to the transmission optical fiber 3, and then epoxy resin is injected into the spiral sleeve 1 through the injection holes 102 to fix the transmission optical fiber 3 and the optical fiber connector 4 and to seal the injection holes 102.

[0032] A monitoring method for a chloride ion monitoring system for a concrete structure comprises the following steps:

[0033] S1, assembling the spiral sleeve 1: installing the transmission optical fiber 3 in the spiral sleeve 1, and then installing the optical fiber connector 4 in the connecting sleeve 2, and connecting the optical fiber connector 4 to the transmission optical fiber 3, and then injecting epoxy resin into the spiral sleeve 1 through the injection hole 102 to fix the transmission optical fiber 3 and the optical fiber connector 4 and plug the injection hole 102, and threading the plugging cover 5 with the connecting sleeve 2 to connect the chloride ion sensor 7 to the optical fiber connector 4 through the RS-485 interface 6;

[0034] S2, sensor initialization and address allocation: assign a unique Modbus address to each chloride ion sensor 7 on the master device, send an initialization command through the master device, check the connection status of each sensor, and ensure that all sensors can communicate normally;

[0035] S3, installing the spiral sleeve 1: fixing the assembled spiral sleeve 1 at a preset height in the pile body by binding, wherein the spiral sleeve 1 is sleeved on the steel cage in the pile body, and recording the radial distance and axial height between each sensor and the outer wall of the pile body;

[0036] S4, real-time monitoring and data collection: the main control device regularly sends instructions through the Modbus protocol to read the chloride ion concentration data measured by each chloride ion sensor 7, and records the timestamp of data collection;

[0037] S5, generating a chloride ion concentration distribution diagram and a permeation rate curve according to the address of each chloride ion sensor 7 and its corresponding radial distance and axial height.

[0038] This solution achieves comprehensive monitoring of chloride ion penetration by arranging multiple chloride ion sensors at different depths inside the concrete, and uses optical fiber and RS-485 interface to achieve fast data transmission. The main control device can read the chloride ion concentration data in real time. Each sensor is assigned a unique address through the Modbus protocol. The main control device can independently read the data of each sensor, avoiding data interference and reducing the complexity of the optical fiber line; the chloride ion sensor 7 is pre-buried in the concrete, which does not affect the integrity and durability of the structure and realizes non-destructive monitoring; and optical fiber transmission has good anti-electromagnetic interference ability, which is suitable for long-term monitoring in complex environments.

[0039] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A chloride ion monitoring system for concrete structures, characterized in that: The invention comprises a spiral sleeve, wherein the spiral sleeve is provided with a plurality of through holes communicating with the interior of the spiral sleeve, the plurality of through holes are arranged at equal intervals along the spiral direction of the spiral sleeve, the spiral sleeve is fixedly connected with a connecting sleeve coaxially arranged with the through hole, the through hole penetrates the connecting sleeve, one end of the spiral sleeve is closed, a transmission optical fiber is installed in the spiral sleeve, one end of the transmission optical fiber extends out of the opening end of the spiral sleeve and is connected with a main control device, an optical fiber connector for electrically connecting with the transmission optical fiber is fixedly installed in the connecting sleeve, a blocking cap capable of closing the connecting sleeve is threadedly connected to the outer wall of the connecting sleeve, an RS-485 interface capable of being plugged with the optical fiber connector is rotatably connected in the blocking cap, a chloride ion sensor electrically connected with the RS-495 interface is fixedly installed on the blocking cap, a plurality of chloride ion sensors are electrically connected with the main control device through the transmission optical fiber, the main control device allocates a unique Modbus address to each chloride ion sensor, and sends an instruction to specify the chloride ion sensor address through the Modbus protocol to read the measurement data of each sensor.

2. The concrete structure chloride ion monitoring system according to claim 1, characterized in that: The spiral sleeve is in a truncated cone shape, and the top diameter of the spiral sleeve is smaller than the bottom diameter of the spiral sleeve.

3. The concrete structure chloride ion monitoring system according to claim 2 is characterized in that: The outer wall of the connecting sleeve is provided with an external thread section, the diameter of the external thread section is smaller than the diameter of the connecting pipe, a first sealing ring is sleeved on the external thread section, and the sealing cover is threadedly connected to the external thread section so that the first sealing ring can be clamped between the connecting sleeve and the sealing cover.

4. The concrete structure chloride ion monitoring system according to claim 3 is characterized in that: A second sealing ring is arranged inside the blocking cover, and the blocking cover is threadedly connected to the external thread section so that the second sealing ring can be clamped between the external thread section and the inner wall of the blocking cover.

5. The concrete structure chloride ion monitoring system according to claim 4, characterized in that: The spiral sleeve is provided with a plurality of injection holes corresponding to the through holes one by one.

6. The concrete structure chloride ion monitoring system according to claim 5, characterized in that: The monitoring method includes the following steps: S1, assembling the spiral sleeve: installing the transmission optical fiber in the spiral sleeve, and then installing the optical fiber connector in the connecting sleeve, and connecting the optical fiber connector to the transmission optical fiber, and then injecting epoxy resin into the spiral sleeve through the injection hole to fix the transmission optical fiber and the optical fiber connector and seal the injection hole, and then connecting the sealing cover with the connecting sleeve through a threaded connection so that the chloride ion sensor is connected to the optical fiber connector through the RS-485 interface; S2, sensor initialization and address allocation: Assign a unique Modbus address to each chloride ion sensor on the master device, send an initialization command through the master device, check the connection status of each sensor, and ensure that all sensors can communicate normally; S3, installing the spiral casing: fixing the assembled spiral casing at a preset height in the pile body by binding, wherein the spiral casing 1 is sleeved on the steel cage in the pile body, and recording the radial distance and axial height between each sensor and the outer wall of the pile body; S4, real-time monitoring and data collection: the main control device sends instructions regularly through the Modbus protocol to read the chloride ion concentration data measured by each chloride ion sensor and record the timestamp of data collection; S5, generating a chloride ion concentration distribution diagram and a permeation rate curve according to the address of each chloride ion sensor and its corresponding radial distance and axial height.

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