JPS6287841A - Method for measuring water content of concrete, mortar, etc., electrode and electrode insert jig - Google Patents

Abstract

PURPOSE:To accurately measure internal water content, by forming two holes to the surface of a molded body composed of concrete or mortar and inserting electrodes in respective holes up to a desired depth. CONSTITUTION:At first, holes 4, 4' each having a relatively small diameter are respectively formed at two proper areas at a predetermined interval (d) so as to be inwardly extend in almost parallel to each other. Next, electrodes 5 are respectively arranged in said holes 4, 4'. One end of a lead wire 6 is fixed to one flat surface of each electrode 5 and the other end thereof is inserted in each of the holes 4, 4' from one end of a tubular electrode insert jig 7 to be protruded to the outside from the other end of said jig 7 and the upper surface of the electrode 5 is contacted with one end 8 of the jig 7. Thus contacted electrode 5 is applied to the inlet of the hole 4 or 3' and the other end 10 of the jig 7 is struck by a tool 12 to drive the electrode 5 into a desired depth. When the electrode 5 has been driven into the desired depth, the jig 7 is pulled off from the hole to arrange the electrode 5 at a desired position. By this method, the electrodes 5 are respectively arranged in the holes 4, 4' and connected to an electric resistance type moisture meter to measure the water content in concrete 1.

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 moisture contained in it is carried out in the next step, such as painting interior and exterior walls; floor coating work, waterproofing work, sealing work, and interior work. This is important when carrying out such operations. 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.

Furthermore, when water leaks from the roof or outer wall of a building after many years have passed, it is important to measure changes in water levels 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 the concrete or mortar, and measure the moisture content in the concrete or mortar based on the change in electric capacity measured at that time. It has become. 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, the present invention solves the problem of conventional concrete as described above.
The purpose is to solve the problems of the method of measuring moisture in mortar, etc., and to provide a simple and convenient method for measuring moisture in concrete, mortar, etc. In addition, we have developed an electrode and an electrode driving jig that can be used directly to carry out this method. The purpose is to provide.

Means for Solving the Problems In order to solve the above problems, the present invention provides concrete,
Two holes are formed at a predetermined interval d in the surface of a formed body such as mortar, electrodes are driven 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. It is characterized by measuring the amount of water inside the 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 desired depths before pouring concrete or mortar.

Further, the electrode 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. It is configured.

Furthermore, the electrode driving jig used to drive the electrode into the hole 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, and the surface of the electrode to which the lead wire is fixed is is brought into contact with one end of the tubular body so that the lead wire passes through the inside of the tubular body and protrudes from the other end of the tubular body, a notch for passing the lead wire is formed at the other end of the tubular body, and a tubular It is constructed with scale lines indicating the longitudinal distance from the one end of the body.

Operation With the above configuration, the electrode is placed inside the wall of concrete, mortar, etc., so the electrical signal picked up by the electrode accurately indicates information on the moisture itself in the concrete, mortar, etc. unaffected by any finishes or treatments used.

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 sink into 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 an example of a concrete wall 1 whose moisture content is measured by the method of the invention.

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

The electric ff15 shown in FIG. 1(A) has a disk-like shape, its diameter is slightly larger than the inner diameter of the hole 4.4', and its material is a metal with some elasticity. It is made of conductive material, such as conductive rubber or 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, an onime nut with protrusions formed on the periphery (Fig. 3 (A)), a conductive rubber disc body (Fig. 3 (B)), or a laminated disc body in which thin conductive rubber disc bodies are laminated. (Fig. 3 (B')) A lead disc structure (Fig. 3 (C)), a disc structure in which metal wires are bundled in a brush shape (Fig. 3 (D)), and a thin metal strip in a spiral shape. Figure 3 (D')), as well as Figures 5 and 6,
A structure such as that shown in FIG. 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. In addition, the thickness of the electrode is made as small as possible (preferably in the order of 5 to 10),
The longitudinal contact area within the hole is minimized so that the measurement point can be accurately set at the desired depth within the hole. Furthermore, the cross-sectional shape of the hole 4.degree. 4' can be any other shape than circular, and in that case it is desirable to match the shape of the electrode to the shape of the hole.

A lead wire 6 is provided on one plane of the electrode 5 configured as described above.
Secure one end in an appropriate direction, such as 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. jig 7
(See FIG. 1(B)).

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', and its inner diameter allows the lead wire 6 to be placed within the inner space of the jig. The dimensions are such that it can be easily inserted into the Furthermore, the jig 7
As shown in the figure, a scale line 9 indicating a distance measured in the longitudinal direction from one end 8, that is, the end with which the electrode 5 comes into contact, is printed or engraved on the outer peripheral surface. Furthermore, the jig 7 has a notch 1 at the other end 1o.
1, and the lead wire 6 extending inside the jig 7 passes through this notch 11 and protrudes laterally outward, and the lead wire 6
does not protrude outward from the end 10 of the jig 7 in the longitudinal direction.

In this way, the electrode 5 in contact with -@8 of the jig 7 is inserted into the hole 4.
Alternatively, the other end 10 of the jig 7 is struck with a tool 12 such as a hammer to drive the electrode 5 into the hole to a desired depth, as shown in FIG. 1(C). At this time, since the lead wire is inside the notch 11, it will not be hit by the hammer 12 and will not be damaged in any way. This driving depth is determined by jig 7.
can be easily read while monitoring the scale lines 9 on the outer circumferential surface. 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 driven into the hole 4 or 4' to the desired depth, the jig can be withdrawn from the hole to place the electrode 5 at the desired position in the hole (see Figure 1 (D)). ).At this time, if the lead wire 6 is a bare wire, it is covered with an insulating tube 13.

In this way, an electrode 5 is placed in each of the holes 4 and 4', and each electrode 5 is connected via a lead wire 6 to a terminal of a suitable electrical resistance moisture meter (not shown). It is possible to measure the moisture content inside.

Another embodiment of the present invention will be described with reference to FIG. In this embodiment, the electrode 5 has a structure in which a metal elastic thin piece 52 is suspended along the periphery of the lower surface of a nut 51, and this nut 51 is screwed into the lower end of a threaded rod 52. In this state, deeply insert the electrodes 5 into the holes 4 and 4',
When the threaded rod 52 is twisted, the tip of the threaded rod 52 comes into contact with the inwardly bent portion of the thin piece 52, spreading the thin piece 52 and pressing the tip of the thin piece 52 against the inner wall surface of the hole 4.4' to improve contact.

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

In this embodiment, the electrode 5 is a shape memory alloy thin plate 54.
It has a structure in which it is wound into a coil shape.

If the coil is heated or cooled before use, the diameter of the coil is reduced, and the coil is inserted into the hole 4.4', the diameter of the coil will be expanded when the temperature returns to room temperature, allowing good contact with the inner wall of the hole 4.4'. The state is obtained. 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.

The detailed structure of the invention allows the present invention to accurately measure the moisture content inside concrete, mortar, etc. even if the surface of the concrete or mortar is tiled or has undergone waterproofing treatment. 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 drawings]

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.
FIG. 2(A) is a diagram showing an example of a concrete structure to which the method can be applied, and FIG. 2(A) is a broken plan view thereof, and FIG.
) is its fracture cross section, FIG. 3 is a diagram showing a preferred example of an electrode that can be used in the method of the present invention, and FIG. 4 is a diagram showing a preferred example of an electrode driving jig that can be used in the method of the present invention. FIG. 5 is a perspective view showing another embodiment of the present invention, FIG. 6 is a perspective view showing still another embodiment, and FIG.
The figure is a perspective view showing a modification of the electrode of FIG. 6. 1... Concrete wall, 4.41...
Hole, 5... Electrode, 6... Lead wire, 7
... Electrode driving jig 9 ... Scale line, 11
...notch, 12...tool, 13...
...Insulating tube.

Claims (9)

[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) 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. In an electrode used in a method for measuring the amount of moisture in walls of concrete, mortar, etc., the lead 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 by having one end of a wire fixed to one surface. (3) 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. An electrode driving jig used for measuring the amount of moisture in walls of concrete, 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. The surface of the electrode to which the wire is fixed is brought into contact with one end of the tubular body, the lead wire passes through the inside of the tubular body and protrudes from the other end of the tubular body, and a notch is formed in the other end of the tubular body through which the lead wire is passed. An electrode driving jig characterized in that the outer peripheral surface of the tubular body is marked with a scale line indicating a longitudinal distance from the one end of the tubular body. (4) The electrode used in claims (1) and (2) is an electrode characterized in that it is a blind nut with protrusions formed around the periphery. (5) An electrode characterized in that the electrode used in claims (1) and (2) is a conductive rubber plate. (6) An electrode characterized in that the electrode used in claims (1) and (2) is a lead disk. (7) The electrode used in claims (1) and (2) is characterized in that it has a disc structure in which metal wires are bundled into a brush shape. (8) The electrodes used in claims (1) and (2) are made of metal, and the outer diameter expands by screwing in a metal screw so that the electrodes come into closer contact with the inner diameter of the hole. Characteristic electrodes. (9) The electrodes used in claims (1) and (2) are made of a shape memory alloy, and have a function of firmly adhering to the inner diameter of the hole when restored to its original shape. An electrode characterized by: