JPH0448186B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for measuring moisture in concrete, mortar, etc., and an electrode and an electrode driving jig used in this method.

Conventional technology After pouring concrete or mortar, measuring changes in the amount of water contained in it is carried out during the next process, such as painting interior and exterior walls; floor painting work, waterproofing work, sealing work, interior work, etc. This is important when carrying out Furthermore, the moisture that evaporates from concrete or mortar has a great effect on the humidity conditions inside the building after completion, and it is important to measure the amount of moisture inside to predict this.

In addition, when water leaks from the roof or outer wall of a building that has aged, it is important to measure changes in the amount of water in order to search for the leakage route.

The conventional method for measuring moisture in concrete, mortar, etc. is to apply an electrode surface that emits a high-frequency electric field to the surface of concrete or mortar, and measure the amount of moisture in concrete or mortar based on the change in capacitance measured at that time. It's summery. However, this method can only measure areas very close to the surface and cannot measure internal moisture.

Problems to be Solved by the Invention Therefore, it is an object of the present invention to solve the above-mentioned problems of the conventional method for measuring moisture in concrete, mortar, etc., and to provide a simple and convenient method for measuring moisture in concrete, mortar, etc. For the purpose of
Another object of the present invention is to provide an electrode and an electrode implantation jig that can be used directly to carry out this method.

Means for Solving the Problems In order to solve the above problems, the present invention forms two holes at a predetermined interval d on the surface of a formed body such as concrete or mortar, and attaches an electrode to each of the holes as desired. The method is characterized in that the electrode is implanted to a deep depth and the electrode is electrically connected to an electric moisture meter to measure the amount of moisture in the concrete, mortar, or other formed body.

The electrodes used in this measurement method can also be used in a method in which electrodes are placed at predetermined intervals d at positions at desired depths before pouring concrete or mortar.

Further, the above used in the present invention is made of a conductive material having an outer diameter slightly larger than the inner diameter of the hole, and has one end of a lead wire connected to the moisture meter fixed to one surface. has been done.

Furthermore, the electrode driving jig used to drive the electrode into the hole is open at both ends and is made of a tubular body having an outer diameter smaller than the inner diameter of the hole, and is used to drive the electrode into the hole with the lead wire fixed. A lead wire is caused to pass through the inside of the tubular body and protrude from the other end of the tubular body by abutting one end of the tubular body, and a notch for passing the lead wire is formed at the other end of the tubular body, and a cutout is formed on the outer circumferential surface of the tubular body. The tubular body is configured with scale lines indicating the longitudinal distance from the one end.

Effect With the above configuration, the electrodes are placed inside the walls of concrete, mortar, etc., so the electrical signals picked up by the electrodes accurately indicate information about the moisture content of the concrete, mortar, etc.
It is not affected by finishes or treatments applied to the wall surface.

In addition, since the electrode is configured to have an outer diameter slightly larger than the inner diameter of the hole after being set, when the electrode is driven into the hole, it will embed in the concrete or mortar, minimizing the contact resistance between them. Make it.

Furthermore, when driving the electrode into the hole, extend the lead wire into the notch and hit the other end of the electrode driving jig with a tool such as a hammer to drive the electrode into the hole, and at this time, do not damage the lead wire with the tool. Moreover, the implantation depth of the electrode can be read from the scale line marked on the outside of the jig, and when implantation is completed, only the jig can be removed from the hole.

EXAMPLE FIGS. 2A and 2B show one example of a concrete wall 1 whose moisture content is measured by the method of the invention.

In implementing the method of the present invention on the concrete wall 1 constructed in this way, first, holes 4 of relatively small diameter are drilled at two suitable locations with a predetermined distance d.
and 4' are respectively formed to extend inwardly substantially parallel to each other. Electrodes 5 are then placed within these holes 4, 4', respectively, as will be explained below.

The electrode 5 shown in FIG. 1A has a disk-like shape, the diameter of which is slightly larger than the inner diameter of the holes 4 and 4', and the material thereof is a metal having some elasticity, Made of conductive material, such as conductive rubber.

However, the electrode 5 is not limited to only those having the above-mentioned shape and properties, and various shapes and properties can be used.

FIG. 3 shows various electrode configurations. In other words, a demon nut with protrusions formed around the periphery (Fig. 3A), a conductive rubber disk (Fig. 3B), or a laminated disk formed by laminating thin conductive rubber disks (Fig. 3B). B′)
A lead disc structure (Fig. 3 C), a disc structure made of metal wire bundled in a brush shape (Fig. 3 D), and a structure made of a thin metal strip wound in a spiral shape (Fig. 3 D') ), structures shown in FIGS. 5, 6, and 7 can be used as the electrode 5.

In any case, when the electrodes are placed in the holes 4, 4', they are embedded in the concrete hole walls so that a good electrical contact is obtained between them. Also, the thickness of the electrode should be as small as possible (preferably 5-10 mm) to minimize the longitudinal contact area within the hole and to allow accurate setting of the measurement point at the desired depth within the hole. Make it. Furthermore, the cross-sectional shape of the holes 4, 4' can be any other suitable shape than circular, and in that case it is desirable to match the shape of the electrode to the shape of the hole.

One end of the lead wire 6 is fixed to one plane of the electrode 5 constructed as described above in an appropriate direction by caulking or screwing. Next, the other end of the lead wire 6 is inserted from one end of the tubular electrode driving jig 7 as shown in FIG. It is brought into contact with the above-mentioned one end of the jig 7 (see FIG. 1B).

The jig 7 is made of a strong material such as a metal tube with both ends open, and its outer diameter is smaller than the inner diameter of the holes 4 and 4'. It has dimensions that allow easy insertion. Furthermore, as shown in FIG. 4, the jig 7 has a scale line 9 printed or engraved on its outer circumferential surface to indicate a distance measured in the longitudinal direction from one end 8, that is, the end with which the electrode 5 comes into contact. Furthermore, the jig 7 has a notch 11 at the other end 10.
The lead wire 6 extending inside the jig 7 projects laterally outward through this notch 11.
The lead wire 6 is designed not to protrude outward in the longitudinal direction from the end 10 of the jig 7.

In this way, the electrode 5 which is in contact with one end 8 of the jig 7 is pressed against the entrance of the hole 4 or 4', and the other end 10 of the jig 7 is inserted with a tool 12 such as a hammer, as shown in FIG. 1C. The electrode 5 is hammered into the hole to the desired depth. At this time, since the lead wire is within the notch 11, it will not be hit by the hammer 12 and will not be damaged in any way. This driving depth can be easily read while monitoring the scale line 9 on the outer peripheral surface of the jig 7. The same effect can be obtained by cutting the upper end of the jig 7 obliquely instead of providing the notch 11.

When the electrode 5 has been implanted to the desired depth within the hole or 4', the jig can be withdrawn from the hole to place the electrode 5 in the desired position within the hole (see Figure 1D). At this time, if the lead wire 6 is a bare wire, it is covered with an insulating tube 13.

In this way, the electrodes 5 are placed in each of the holes 4 and 4', and each electrode 5 is connected to the lead wire 6.
The moisture content in the concrete 1 can be measured by connecting it to the terminal of a suitable electrical resistance moisture meter (not shown) through the connector.

Another embodiment of the present invention will be described with reference to FIG. In this embodiment, the electrode 5 is a nut 51
A thin elastic metal piece 52 is suspended along the periphery of the lower surface of the rod, and this nut 51 is screwed into the lower end of the threaded rod 52. In this state, if the electrode 5 is deeply inserted into the holes 4 and 4', and the threaded rod 52 is twisted, the tip of the threaded rod 52 will hit the inwardly bent part of the thin piece 52, widening the thin piece 52, and twisting the threaded rod 52. The tip of the thin piece 52 is pressed against the inner wall surface to improve contact.

Another embodiment of the present invention will be further described with reference to FIG.

In this embodiment, the electrode 5 has a configuration in which a thin plate 54 made of a shape memory alloy is wound into a coil shape.
If the coil diameter is reduced by heating or cooling before use and inserted into the holes 4, 4', the coil diameter will be enlarged when returning to normal temperature, so the diameter of the coil will be increased.
good contact with the inner wall of the Note that the shape memory alloy thin plate 54 in this embodiment may have a shape other than a coil shape. For example, it may have a flared shape as shown in FIG.

Effects of the Invention With the configuration described above, the present invention can accurately measure water inside concrete, mortar, etc. even if the surface of the concrete or mortar has been tiled or waterproofed. The contact resistance between the electrode and concrete or mortar can be minimized to improve measurement accuracy, and the electrode can be placed at the desired depth within the hole without damaging the lead wire. It has excellent effects such as:

[Brief explanation of the drawing]

FIG. 1 is a process explanatory diagram of an example of the method for measuring moisture in concrete, mortar, etc. according to the present invention, and FIG. 2 is a diagram showing an example of a concrete structure to which the method of the present invention can be applied. A is its fractured plan view, FIG. 2B is its fractured cross section, and the third
The figures are views showing a preferred example of an electrode that can be used in the method of the present invention, FIG. 4 is a cutaway perspective view of a preferred example of an electrode driving jig that can be used in the method of the present invention, and FIG.
The figures are perspective views showing other embodiments of the present invention, FIG. 6 is a perspective view showing still another embodiment, and FIG. 7 is a perspective view showing another embodiment.
The figure is a perspective view showing a modification of the electrode of FIG. 6. 1... Concrete wall, 4, 4'... Hole, 5...
...electrode, 6...lead wire, 7...electrode driving jig,
9...Scale line, 11...Notch, 12...Tool, 1
3...Insulating tube.

Claims (1)

[Claims] 1. Two holes are formed at a predetermined interval on the surface of a formed body such as concrete or mortar, an electrode is implanted into each of the holes to a desired depth, and the electrode is electrically connected to an electric moisture meter. A method for measuring the amount of moisture in the walls of concrete, mortar, etc. 2. The method according to claim 1, wherein the electrode is a cylindrical nut with protrusions formed around the periphery. 3. The method according to claim 1, wherein the electrode is a conductive rubber plate. 4. The method according to claim 1, wherein the electrode is a lead disk. 5. The method according to claim 1, wherein the electrode has a disc structure in which metal wires are bundled into a brush shape. 6. The method according to claim 1, characterized in that the electrode is made of metal, and its outer diameter expands by screwing in a metal screw so that it comes into closer contact with the inner diameter of the hole. . 7. The method according to claim 1, wherein the electrode is made of a shape memory alloy, and has a function of firmly adhering to the inner diameter of the hole when the electrode returns to its original shape. Method. 8. Two holes are formed at a predetermined interval in a wall surface of concrete, mortar, etc., electrodes are implanted into each of the holes to a desired depth, and the electrodes are electrically connected to an electric moisture meter to measure the concrete, mortar, etc. In an electrode used in a method for measuring the amount of moisture in a wall of mortar, etc., one end of a lead wire is made of a conductive material having an outer diameter slightly larger than the inner diameter of the hole, and is connected to the moisture meter. An electrode characterized in that it is formed by fixing on one surface. 9. The electrode according to claim 8, wherein the electrode is a round nut with protrusions formed around the periphery. 10. The electrode according to claim 8, wherein the electrode is a conductive rubber plate. 11. The electrode according to claim 8, wherein the electrode is a lead disk. 12. The electrode according to claim 8, wherein the electrode has a disc structure in which metal wires are bundled into a brush shape. 13. The electrode according to claim 8, wherein the electrode is made of metal, and is configured such that its outer diameter expands by screwing in a metal screw so that it comes into closer contact with the inner diameter of the hole. . 14. The electrode according to claim 8, wherein the electrode is made of a shape memory alloy, and has a function of firmly adhering to the inner diameter of the hole when the electrode returns to its original shape. electrode. 15. Two holes are formed at a predetermined interval in a wall surface of concrete, mortar, etc., electrodes are implanted into each of the holes to a desired depth, and the electrodes are electrically connected to an electric moisture meter to measure the concrete, mortar, etc.
An electrode driving jig used in a method for measuring the amount of moisture in the walls of mortar, etc. is made of a tubular body that is open at both ends and has an outer diameter smaller than the inner diameter of the hole. a surface of the fixed electrode is brought into contact with one end of the tubular body, and a lead wire is passed through the interior of the tubular body and protrudes from the other end of the tubular body;
Electrode implantation characterized in that a notch is formed at the other end of the tubular body for passing the lead wire, and a scale line indicating a longitudinal distance from the one end of the tubular body is marked on the outer peripheral surface of the tubular body. jig.