JP2010151464A - Salt measuring device for structure surface - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a salt measuring device for a surface of a structure having high measurement precision. <P>SOLUTION: The salt measuring device includes: a device body 30 having an operation panel 30a and a display section 30b along with an arithmetic processing unit; and a detection section 11 that is connected to the device body 30 for detection in contact with a surface S of a steel structure. The detection section 11 includes: a liquid holding chamber 12 that has an opening 12a at one end and receives and holds demineralized water for extracting salt when measuring the salt; a liquid supply channel 13 for supplying demineralized water to the liquid holding chamber 12; a stirring element 14 for stirring liquid in the liquid holding chamber 12; a sensor 15 for measuring salt, where a detection end is exposed into the liquid holding chamber 12; a sealing member 18 that is adhered to the surface S of the steel structure and keeps a liquid-tight state of the liquid holding chamber 12; a magnet 19 for attracting the detection section 11 on the surface S of the steel structure; and a separation means 20 for separating one portion of the sealing member 18 from the surface S of the steel structure against magnetic force of the magnet 19. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an apparatus for extracting and collecting salt attached to the surface of various structures and simultaneously measuring the salt.

  Steel structures such as railway and road bridges, ships, and large tanks in plants need to be surface-coated when newly constructed or maintained in order to prevent corrosion.

  However, if surface coating is performed with salt such as sea salt particles attached to the surface of these steel structures, the coating film may swell or delaminate, or rust may occur on the surface of the steel structure. The anticorrosion effect cannot be obtained. Therefore, before performing surface coating, it is conventionally performed to measure the salinity concentration on the surface of the steel structure and to manage the cleanliness of the surface of the steel structure.

The concentration of salt attached to the surface of the steel structure varies depending on the type of steel structure and the environment, but may exceed 1000 mg / m ² near the coast. This salt content is removed by washing, sandblasting, etc., and it is necessary to make it below the control concentration which is usually set to about 50 to 300 mg / m ² at the stage before surface coating.

  In such a case, as an apparatus for measuring the salinity concentration on the surface of the steel structure, as shown in FIG. 1 in Patent Documents 1 to 3, the detection unit 1 is brought into contact with the steel structure surface S to detect the detection unit 1. Pure water for salt extraction is supplied from a pure water supply source W such as a syringe to the liquid holding chamber 2 provided in the liquid via the liquid supply flow path 3, and purified using a stirrer 4 provided in the liquid holding chamber 2. An apparatus is known that measures the salt concentration of the steel structure surface S by stirring the water and dissolving and extracting the salt content from the steel structure surface S and then measuring the electrical conductivity of the liquid with the sensor 5. .

Japanese Patent No. 3912776 No. 4-5003 Japanese Utility Model Publication No. 6-13475

  In order for the measurement apparatus to perform highly accurate measurement, it is desirable that the amount of pure water received and held in the liquid holding chamber 2 is always constant. Therefore, conventionally, a plurality of air vent channels for exhausting the air in the liquid holding chamber 2 when receiving pure water have been provided.

  For example, in the apparatus shown in FIG. 1, a first air vent channel 6 and a second air vent channel 7 are provided on the opening 2 a side and the upper bottom surface 2 b side of the liquid holding chamber 2, respectively. As a result, when measuring the salinity concentration of the steel structure surface S facing directly downward (ceiling surface) or diagonally downward, air is extracted from the first air vent channel 6 provided on the opening 2a side. When measuring the salinity concentration of the steel structure surface S facing diagonally upward, the liquid holding chamber is obtained by removing air from the second air vent channel 7 provided on the upper bottom surface 2b side of the liquid holding chamber 2. 2 can always receive a substantially constant amount of pure water for measurement. In addition, when measuring the salinity concentration of the vertical steel structure surface S, any one of the first air vent channel 6 or the second air vent channel 7 may be used.

  However, as shown in FIG. 2, a sealing member 8 such as an O-ring made of silicone rubber is provided around the opening 2a of the liquid holding chamber 2 in order to keep the liquid holding chamber 2 in a liquid-tight state. It has been. Since the exhaust port 6a of the first air vent channel 6 must be provided closer to the liquid holding chamber 2 than the seal member 8, when measuring the salinity of the steel structure surface S facing directly below or diagonally downward, The air A cannot be exhausted at least as much as the thickness of the seal member 8, causing an error in the measured value.

  The present invention has been made in view of such conventional circumstances, and even when the salinity concentration of the surface of a structure such as steel facing directly below or obliquely below is measured, the liquid holding chamber is almost full. An object of the present invention is to provide a salinity measuring apparatus with a high measurement accuracy capable of receiving pure water up to.

  In order to achieve the above object, a salinity measuring device for a surface of a structure according to claim 1 provided by the present invention comprises a device body including an operation panel and a display unit together with an arithmetic processing device, and a structure connected to the device body. A detection unit that performs detection by contacting the object surface, the detection unit having an opening at one end and receiving and holding pure water for salt extraction at the time of salt measurement; and A liquid supply channel for supplying pure water to the liquid holding chamber, a stirrer for stirring the liquid in the liquid holding chamber, a salt measurement sensor with the detection end exposed in the liquid holding chamber, and the surface of the structure A seal member that maintains a liquid-tight state of the liquid holding chamber, a magnet that attracts the detection unit to the surface of the structure, and a separating unit that separates a part of the seal member from the surface of the structure against the magnetic force of the magnet. It is characterized by that.

  In the salinity measuring apparatus for a surface of a structure according to the present invention, the separation means is an interposed member that is sandwiched between the surface of the structure and a contact surface of a detection unit that contacts the structure surface.

  In the above-described salinity measuring apparatus for a structure surface according to the present invention, the separation means is a movable member that appears and disappears from a contact surface of a detection unit that contacts the structure surface.

  In the salinity measuring apparatus for a surface of a structure according to the present invention, the movable member is characterized in that it can rotate or move in and out between a position protruding from the contact surface and a retracted position.

  In the salinity measuring apparatus for a structure surface according to the present invention, the movable member has a contact tool that contacts the structure surface, and the positional relationship between the structure surface and the contact tool that contacts the structure surface. The movable member can be projected and retracted from the contact surface without changing the angle.

  In the salinity measuring apparatus for a surface of a structure according to the present invention, the movable member is a rod-like member that is inserted into a through-hole that is formed in the detection unit, and protrudes against the magnetic force of the magnet. It is characterized by having a locking mechanism for maintaining.

  According to the present invention, since pure water can be received until the liquid holding chamber is almost full, highly accurate salinity measurement can be performed.

  A specific example of the salinity measuring apparatus for the structure surface according to the present invention will be described with reference to FIG. This salinity measuring apparatus is composed of an apparatus main body 30 provided with an operation panel 30a, a display unit 30b and the like together with an arithmetic processing unit (not shown), and a detection unit 11 connected to the apparatus main body 30 via a cord, and is lightweight and small in size. It is a simple device that can. The detection unit 11 has an outer shape composed of a substantially cylindrical portion 11a and a flange portion 11b formed at the tip thereof, so that the contact surface 11s of the flange portion contacts the steel structure surface S. It has become.

  The detection unit 11 has a liquid holding chamber 12 having a capacity of about 2 to 20 ml for receiving and holding pure water for salt extraction. The liquid holding chamber 12 has a preferably circular opening 12a having a predetermined opening area so that the received pure water can be brought into contact with the surface S of the steel structure and the salt adhering thereto can be extracted and collected. is doing. The liquid holding chamber 12 is defined by an upper bottom surface 12b facing the opening 12a and a side surface 12c surrounding the opening 12a. These surfaces are preferably ABS, PVC (polyvinyl chloride), PMMA (acrylic), PA. (Polyamide), PTFE (fluororesin), PVDF (polyvinylidene fluoride), and epoxy resin.

  A seal member 18 such as an O-ring made of silicone rubber or the like is provided at the periphery of the opening 12a. When the contact surface 11s comes into contact with the steel structure surface S, the seal member 18 is in close contact with the steel structure surface S and maintains the liquid-tight state of the liquid holding chamber 12. A permanent magnet 19 is provided outside the seal member 18. Thereby, the contact surface 11s can be adsorbed to the steel structure surface S.

  Pure water from which salt is extracted and collected is supplied to the liquid holding chamber 12 through the liquid supply channel 13 from a pure water supply source W such as a syringe or a soft plastic container illustrated in FIG. A connecting portion 13a is provided at one end of the liquid supply channel 13 so that the pure water supply source W is detachably attached.

  The detection unit 11 further includes a stirrer 14 that stirs the liquid in the liquid holding chamber 12 at a rotational speed of about 500 to 3000 rpm. The stirring bar 14 is driven by a motor 14a. Driving start and stop of the motor 14a are performed by the switch 14b, and the power of the motor 14a is supplied from the battery 14c.

  The electrical conductivity of the liquid in the liquid holding chamber 12 is measured by the salt content measurement sensor 15. The salinity measurement sensor 15 is desirably provided so as to be exposed from the upper bottom surface 12b or the side surface 12c. Since the electrical conductivity measured by the salinity measurement sensor 15 varies depending on the temperature change of the liquid, a temperature sensor (not shown) for compensating for this may be provided. The salinity measurement sensor 15 and the temperature sensor are connected to the arithmetic processing unit of the apparatus main body 30 by lead wires.

  It is desirable that an air vent channel 17 communicating with the outside is provided on the upper bottom surface 12 b side of the liquid holding chamber 12. Thereby, when measuring the steel structure surface S which faces directly upward or diagonally upward, the air in the liquid holding chamber 12 can be extracted from the air vent channel 17 when pure water is received. An air vent plug 17a that can be opened and closed is provided at the outlet of the air vent channel 17 in order to keep the liquid holding chamber 12 in a liquid-tight state after the completion of receiving pure water. In order to improve operability, the air vent channel 17 is preferably provided at a position facing the liquid supply channel 13.

  When measuring a steel structure surface S that faces directly below or diagonally downward or a vertical steel structure surface S, air is removed using a separation means described later, and therefore the opening 12a side of the liquid holding chamber 12 It is not necessary to provide an air vent channel in Further, when the air vent channel 17 is provided, as shown in FIG. 1, the shape of the upper bottom surface 12b is formed in an inverted conical shape that gradually rises toward the opening 12a toward the center. May be. As a result, when pure water is supplied to the liquid holding chamber 12, the air in the liquid holding chamber 12 moves smoothly along the tapered surface of the upper bottom surface 12b toward the peripheral edge with the flow of pure water. The air is exhausted to the outside from the air vent channel 17 located at the position.

  The detection unit 11 includes a separation unit 20 that separates a part of the seal member 18 from the steel structure surface S against the magnetic force of the permanent magnet 19 when pure water is supplied. As a result, when measuring the steel structure surface S facing directly or obliquely downward or the vertical (vertical downward) steel structure surface S, a part of the seal member 18 and the steel structure are received when pure water is received. The space between the object surface S can be separated, and the air in the liquid holding chamber 12 can be extracted from the gap.

  The distance to be separated by the separating means 20 is appropriately determined according to the shape and opening area of the opening 12a, the thickness of the seal member 18, and the size of the contact surface 11s of the detection unit 11. Specifically, the distance T to be separated can be obtained from the following mathematical formula.

[Equation 1]
T = (tan θ × L) + h

  Here, the distance L is a distance between the position P1 and the position P2, as shown in FIG. 4A, and the position P1 is the abutment farthest from the steel structure surface S by the separating means 20. The end of the surface 11s is a position on the steel structure surface S that contacts when the separating means 20 is pulled out or retracted, and the position P2 is the steel structure surface S when separated by the separating means 20. This is the central portion of a portion of the seal member 18 that is in close contact with the surface. Further, as shown in FIG. 4B, the angle θ is an angle formed by the steel structure surface S and the contact surface 11s when the state separated by the separating means 20 is viewed from the side. Furthermore, the height h is a gap (distance) generated by the seal member 18 when the seal member 18 comes into close contact with the steel structure surface S, as shown in FIG. As can be seen from the above formula, the distance T is a value obtained by adding the gap generated by the seal member 18 to the distance separated by inclining by the angle θ.

  The angle θ is preferably 0.1 to 3.0 °. If the angle is less than 0.1 °, the gap between a part of the seal member 18 and the steel structure surface S when they are separated from each other is too narrow to efficiently extract air. On the other hand, if the angle is larger than 3.0 °, the magnetic force of the permanent magnet 19 becomes difficult to reach the steel structure, and the detection unit 11 may be detached from the steel structure surface S and fall. When pure water exceeding the capacity is supplied to the liquid holding chamber 12 in a state where the steel structure surface S and the contact surface 11s are separated from each other, the water surface rises from the contact surface 11s. No leakage occurs due to the surface tension of water.

  As a specific example of the separation means 20, an interposition member 120 sandwiched between the steel structure surface S and the contact surface 11 s of the detection unit 11 that contacts the steel structure surface S as shown in FIG. 5A is used. be able to. The interposition member 120 is made of, for example, a round bar or a plate-like member, and is interposed so as to be inserted in the longitudinal direction. In the case of a plate-like member, the width is preferably 20 mm or less. If it exceeds 20 mm, the distance at which a part of the seal member 18 is separated from the steel structure surface S becomes too wide when sandwiched, and the detection unit 11 may fall off the steel structure surface S as described above.

  The material of the interposition member 120 is preferably a material that is not easily affected by the magnetic force of the permanent magnet 19. Specific examples include nonmagnetic metals such as aluminum, titanium, and stainless steel, plastic materials such as polyethylene, polypropylene, ABS, polystyrene, and polycarbonate, and composite materials thereof.

  In addition, after the acceptance of the pure water into the liquid holding chamber 12 is completed, the magnetic force of the permanent magnet 19 is brought into contact with the steel structure surface S as shown in FIG. It is preferable that the intervening member 120 can be easily pulled out against the above, so that it is preferable that the end of the intervening member 120 is provided with a bent portion, an uneven portion or the like, or a string is tied. . Moreover, it is more preferable that the structure is such that it can be attached to the detection unit 11 so as not to be lost when the interposition member 120 is not used.

  As another specific example of the separation means 20, a movable member that protrudes and appears from the contact surface 11 s of the detection unit 11 that contacts the steel structure surface S can be used. For example, as shown in FIG. 6, a lever 220 that can rotate between a position protruding from the contact surface 11s and a position retracted can be used. When the detection unit 11 is not used or when salinity is measured, the lever 220 is raised vertically with respect to the contact surface 11s so as not to protrude from the contact surface 11s, as shown in FIG. 6B. When pure water is received in the liquid holding chamber 12, as shown in FIG. 6A, the end of the lever 220 protrudes from the contact surface 11s by being inclined by a predetermined angle with respect to the contact surface 11s. Let Thereby, a part of the sealing member 18 can be separated from the steel structure surface S against the magnetic force of the permanent magnet 19.

  Even in this separated state, the magnetic force of the permanent magnet 19 is strongly applied to the steel structure, so that the detection unit 11 does not fall off the steel structure surface S, and the pure water into the liquid holding chamber 12 does not fall. After the acceptance is completed, the lever 220 is merely raised in a direction perpendicular to the contact surface 11s, and the magnetic force attracts the detection unit 11 to the steel structure surface S, so that the entire circumference of the seal member 18 is steel. Adheres to the surface S of the structure.

  The lever 220 is not limited to the shape shown in FIG. 6, and as shown in FIG. 7A, the protruding side end portion protrudes when raised in a direction perpendicular to the contact surface 11s. A lever 220a having a convex shape may be used, or as shown in FIG. 7B, the lever 220a protrudes even if it is tilted in either direction from the position raised in the direction perpendicular to the contact surface 11s. As described above, a lever 220b having a protruding end portion in a rectangular shape may be used.

  As another specific example of the movable member protruding and retracting from the contact surface 11s of the detection unit 11 that contacts the steel structure surface S, a member that can be freely moved between a position protruding from the contact surface 11s and a retracted position is used. Can be used. For example, as shown in FIG. 8, a screw hole 21 intersecting the contact surface 11 s of the detection unit 11 is provided in the flange portion 11 b, and a screw member 320 is screwed into the screw hole 21, so that the screw member 320 Depending on the degree of screwing, the tip of the screw-shaped member 320 may be protruded from and abutted on the contact surface 11s. Thereby, the protruding position of the screw-like member 320 when separating a part of the seal member 18 from the steel structure surface S is set to the maximum protruding position shown in FIG. 8 (a) and the retracted position shown in FIG. 8 (b). Can be in any position between. In this case, a rotational force is applied to the screw-like member 320 as well as a force to be protruded. As a result, these forces are applied to the steel structure surface S in contact with the tip.

  As shown in FIG. 9, a contact tool 320a that contacts the steel structure surface S may be provided as a separate member at the tip of the screw member 320. When it is desired to project the contact tool 320a from the steel structure surface S by using a separate member, the screw-shaped member 320 is rotated while being screwed upward. It does not rotate, only the force to make it project. Thus, while maintaining the positional relationship when the contact tool 320a and the steel structure surface S are in contact with each other, the screw-like member 320 is moved to the maximum projecting position shown in FIG. 9 (a) and FIG. 9 (b). It can be made to appear and retract between the retracted positions shown in FIG. As a result, there is no possibility of scratching the contact portion of the steel structure surface S.

  The member that can be freely inserted and removed between the position protruding from the contact surface 11s and the retracted position is not limited to a screw-like member screwed into the screw hole as shown in FIGS. As shown in the figure, a rod-shaped member 420 having no thread groove may be inserted into the through hole 121 having no thread groove formed in the flange portion 11b. As a result, the tip can be easily projected by simply pushing the end of the rod-shaped member 420 like a knock-type ballpoint pen.

  However, in the case of this rod-shaped member 420, it is desirable to include a locking mechanism that maintains the protruding state against the magnetic force of the permanent magnet 19. For example, as shown in FIG. 10, a small hole 420a is formed in the side surface of the rod-shaped member 420 facing the inner wall of the through-hole 121, and the engaging tool 420b protruding and retracting the small hole 420a and the direction in which the engaging tool 420b protrudes. Energizing means 420c such as a spring for energizing is housed. When the tip of the rod-shaped member 420 is retracted from the contact surface 11s, the engaging tool 420b is pressed against the inner wall of the through hole 121 and retracted in the small hole 420a.

  On the other hand, an engagement hole 121a is formed in the inner wall portion of the through hole 121 so that the engagement tool 420b can be fitted when the tip end of the rod-shaped member 420 comes to a predetermined protruding position. Accordingly, when the distal end of the rod-shaped member 420 is pushed and the tip of the rod-shaped member 420 protrudes from the contact surface 11 s, the engaging tool 420 b slides on the inner wall of the through hole 121, and the tip of the rod-shaped member 420. When the portion comes to a predetermined protruding position, it protrudes from the small hole 420a by the urging force of the urging means 420c and engages with the engaging hole 121a. As a result, even if a force for retracting the rod-shaped member 420 is exerted by the magnetic force of the permanent magnet 19, the tip of the rod-shaped member 420 is fixed at a position protruding from the contact surface 11s.

  When the tip of the rod-shaped member 420 is retracted from the contact surface 11s, the engagement tool 420b and the engagement hole 121a are pushed by pressing the pressing rod 121b extending to the engagement hole 121a against the urging force of the urging means 420c. And the rod-shaped member 420 is retracted by the magnetic force of the permanent magnet 19, and the detection unit 11 is attracted to the steel structure surface S and the entire circumference of the seal member 18 is in close contact with the steel structure surface S.

  In order to extract the air in the liquid holding chamber 12 from the gap between a part of the seal member 18 and the steel structure surface S, the detection unit 11 is provided with a steel structure so that the above-described various separating means 20 are always located on the upper side. It is desirable to attach to the object surface S. For this reason, as shown in FIG. 11, it is preferable that the detection unit 11 is provided with a level 22 that indicates the inclination of the contact surface 11s that contacts the steel structure surface S. The type of the level 22 may be any type such as a rod or circle. In addition, as a material of the levers 220, 220a, 220b, the screw-like member 320, the contact tool 320a, and the rod-like member 420, a magnetic metal can be used in addition to the materials mentioned for the interposition member 120.

  As described above, since almost no air remains in the liquid holding chamber 12 when pure water is received, a fixed amount of pure water can always be received in the liquid holding chamber 12. As a result, it is possible to eliminate the measurement error of the salinity concentration due to the difference in the liquid amount, and it is possible to perform the measurement with high accuracy.

  Next, a method for measuring the concentration of the salt attached to the steel structure surface S facing vertically or obliquely downward or the vertical steel structure surface S using the above-described salinity measuring apparatus will be described. First, the contact surface 11 s of the detection unit 11 is brought close to the steel structure surface S, and the detection unit 11 is attracted to the steel structure surface S by the magnetic force of the permanent magnet 19. At this time, a part of the seal member 18 is separated from the steel structure surface S by the separating means 20. In this state, a predetermined amount of pure water is injected into the liquid holding chamber 12 from the pure water supply source W through the liquid supply channel 13. As pure water is injected, the air in the liquid holding chamber 12 is exhausted to the outside through the gap between the portion of the seal member 18 and the steel structure surface S.

  When the injection of pure water is completed, the separation means 20 is retracted or removed from the contact surface 11s of the detection unit 11, and the entire circumference of the seal member 18 is brought into close contact with the steel structure surface S, so that the liquid holding chamber 12 is in a liquid-tight state. Keep. Thereafter, the switch 14b is turned on to rotate the stirrer 14 to stir the liquid in the liquid holding chamber 12, and dissolve and extract the salt attached to the steel structure surface S. After a predetermined time has elapsed, the switch 14b is turned off to stop the rotation of the stirring bar 14. The concentration of the salt dissolved and extracted in the liquid in the liquid holding chamber 12 is detected by the salt measuring sensor 15 in the liquid holding chamber 12, converted into an electrical signal, sent to the arithmetic processing unit of the apparatus main body 30, and processed. Then, it is displayed as the salinity concentration per unit area of the steel structure surface S on the display unit 30b.

  Using the salinity measuring apparatus shown in FIG. 3, as will be described in detail below, a part of the seal member 18 provided around the opening 12a of the liquid holding chamber 12 is separated from the steel structure surface S by the separating means 20. In this state, pure water was injected into the liquid holding chamber 12 to check for leakage. In this salinity measuring apparatus, the diameter of the flange portion 11 b of the detection unit 11 is 94 mm, and an O-ring having a ring diameter of 40 mm is used as the seal member 18. When this O-ring was brought into close contact with the steel structure surface S, the gap between the contact surface 11s and the steel structure surface S was 0.6 mm.

  As the separating means 20, a plate-shaped interposition member having a height of 2 mm is sandwiched at a position 5 mm inside from the edge of the flange portion 11b, and the detection unit 11 is moved by the magnetic force of the permanent magnet 19 on the steel structure surface S facing directly below. Pure water was supplied after adsorption. The angle θ formed by the steel structure surface S and the contact surface 11s at this time was 1.2 °. As a result, the air in the liquid holding chamber 12 could be satisfactorily extracted, and pure water did not leak unless the liquid holding chamber 12 was full.

  The plate-shaped interposition member having a height of 2 mm was left as it was, and pure water was supplied by adsorbing the detection unit 11 to the vertical steel structure surface S by the magnetic force of the permanent magnet 19. At this time, the side where the intervening member is located (the side where the end of the contact surface 11 s is farthest from the steel structure surface S) is the top surface. As a result, pure water leaked before the liquid holding chamber 12 became full. Therefore, when the plate-shaped interposition member is replaced with a 1.2 mm height member and the detection unit 11 is again adsorbed to the vertical steel structure surface S and pure water is supplied, the liquid holding chamber 12 becomes full. Pure water did not leak unless it was. The angle θ formed by the steel structure surface S and the contact surface 11s at this time was 0.4 °.

It is a partial fragmentary sectional side view of the detection part of the conventional salt content measuring apparatus. It is the general | schematic fragmentary sectional side view which showed the mode when the pure water was received in the liquid holding chamber of the conventional salt content measuring apparatus. It is a partial fragmentary side view of the outline of the salinity measuring apparatus which concerns on one embodiment of this invention. It is the schematic which showed the mode when the detection part of the salinity measuring apparatus which concerns on one embodiment of this invention was spaced apart from the steel structure surface. It is the schematic which showed the specific example of the separation means of this invention. It is the schematic which showed the other specific example of the separation means of this invention. It is the schematic which showed the modification of the separation means of FIG. It is the schematic which showed the other specific example of the separation means of this invention. It is the schematic which showed the modification of the separation means of FIG. It is the schematic which showed the other specific example of the separation means of this invention. It is the schematic which showed a mode when the salinity measuring apparatus which concerns on one embodiment of this invention was equipped with the level.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 11 Detection part 2, 12 Liquid holding chamber 3, 13 Liquid supply flow path 4, 14 Stirrer 5, 15 Sensor for salt content measurement 6, 7, 17 Air vent flow path 8, 18 Seal member 19 Permanent magnet 20 Separation means 30 Equipment body S Steel structure surface A Residual air W Pure water supply source

Claims (6)

  A salinity measuring device for a surface of a structure comprising an apparatus main body provided with an operation panel and a display unit together with an arithmetic processing unit, and a detection unit connected to the apparatus main body for detecting by contact with the surface of the structure, The detection unit has an opening at one end, receives a liquid for salt extraction and holds the pure water for salt measurement, a liquid supply channel for supplying pure water to the liquid holding chamber, and a liquid holding A stirrer that stirs the liquid in the chamber, a salinity measurement sensor with the detection end exposed in the liquid holding chamber, a seal member that is in close contact with the surface of the structure and maintains the liquid-tight state of the liquid holding chamber, and a detection unit A salinity measuring apparatus for a surface of a structure, comprising: a magnet that is attracted to the surface of the object; and a separation unit that separates a part of the seal member from the surface of the structure against the magnetic force of the magnet.   2. The salinity measuring apparatus for a structure surface according to claim 1, wherein the separation means is an interposition member sandwiched between the surface of the structure and a contact surface of a detection unit that contacts the structure surface.   2. The salinity measuring apparatus for a structure surface according to claim 1, wherein the separation means is a movable member that protrudes and protrudes from a contact surface of a detection unit that contacts the structure surface.   4. The salinity measuring apparatus for a surface of a structure according to claim 3, wherein the movable member is rotatable or retractable between a position protruding from the contact surface and a retracted position.   The movable member has an abutting tool at a portion that abuts on the surface of the structure, and the movable member does not change the positional relationship between the surface of the structure and the abutting tool abutted on the structure. The salinity measuring device for a surface of a structure according to claim 3 or 4, wherein the salinity measuring device can be projected and retracted from a contact surface.   The movable member is a rod-like member that is inserted into a through hole formed in the detection unit, and includes a locking mechanism that maintains a protruding state against the magnetic force of the magnet. The apparatus for measuring salinity on the surface of a structure according to claim 3 or 4.

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