JPH06229959A - Method for confirmation of concrete fill - Google Patents

Abstract

PURPOSE:To provide a method for confirming concrete fill to confirm the degree of fill in the concrete placing without using a transparent form. CONSTITUTION:A high-resistance element 3 is fixed to a specific position inside a from 1 for placing concrete and the high-resistance element 3 is buried inside when placing the concrete 2 into the from 1. The concrete 2 is densely filled into the form 1 previosuly and at that time current Io on charging flowing to the high-resistance element 3 according to application of a constant voltage V is measured. When placing the concrete 2 into the mold 1, the current Ic at the placing time flowing in the high-resistance element 3 according to the application of the constant voltage V is measured and then the current Ic on placing is compared with the current Io on filling, thus obtaining the degree of filling of the placed concrete 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete filling confirmation method, and more particularly to a method for confirming the filling degree while placing concrete.

[0002]

2. Description of the Related Art Conventionally, when placing concrete in a mold, vibration compaction work is performed by a vibrator in order to fill the concrete in every corner of the mold.

[0003]

However, with the conventional method using a vibrator, it is not possible to confirm whether or not the concrete is sufficiently filled. A method of checking the filling degree of concrete using infrared rays, laser, etc. has been proposed, but it is difficult to manage the equipment at the work site because it is fragile, and the operation is complicated, so the filling degree is checked in parallel with the placement. Difficult to do.

Further, when superfluid concrete which has been developed recently is used, it can be constructed without compaction work, but it is necessary to confirm that the poured concrete is sufficiently filled. There is. In the superfluid concrete construction model, the filling status is also checked using a transparent form such as acrylic. However, the transparent form is expensive and it is often difficult to adopt it in terms of construction cost.

Therefore, an object of the present invention is to provide a concrete filling confirmation method capable of confirming the filling degree at the time of placing without using a transparent mold.

[0006]

With reference to FIG. 1, a concrete filling confirmation method according to the present invention comprises fixing a high resistance element 3 at a predetermined position to be filled with concrete 2 in a concrete placing formwork 1. When the concrete 2 is densely filled in the formwork 1, the filling current Io flowing through the high resistance element 3 in response to the application of the constant voltage V is measured, and when the concrete 2 is placed in the formwork 1. The filling current Ic flowing through the high resistance element 3 in response to the application of the constant voltage V is measured, and the filling current Io is compared with the filling current Ic to obtain the filling degree of the placed concrete 2. It becomes.

[0007]

The high resistance element 3 of the present invention is fixed at a predetermined position inside the mold 1 and is embedded in the concrete 2 that is cast into the mold 1. FIG. 1 (A1) shows the high resistance element 3 before being embedded in the concrete 2, and FIG. 1 (B1) shows the high resistance element 3 when the concrete 2 is densely filled in the mold 1. Figure 1 (A
In the case of 1), air is an insulator, whereas in the case of FIG. 1 (B1), the concrete 2 passes current, so a circuit in which the high resistance element R and the resistance Ro of the filled concrete are connected in parallel (see FIG. 1 ( B
It is equivalent to 2)). Therefore, the filling current Io flowing under the situation of FIG. 1 (B1) in response to the application of the constant voltage V is larger than the current I (FIG. 1 (A2)) before being buried in the concrete 2.
On the other hand, when a void is created in the concrete 2 cast as shown in FIG. 1 (C1), the resistance Rc of the concrete 2 (FIG. 1 (C2)) becomes larger than the resistance Ro at the time of filling. Therefore, the pouring current Ic flowing under the situation of FIG. 1 (C1) in response to the application of the constant voltage V becomes smaller than the filling current Io.

FIG. 1D shows an example of comparison between the filling current Io (shown by the solid line) and the pouring current Ic (shown by the dotted line). When the pouring current Ic and the filling current Io are compared, if the two have the same size, the concrete 2 is sufficiently filled, and if the pouring current Ic is smaller than the filling current Io, the unfilled portion It can be seen that

Therefore, the object of the present invention is to "provide a concrete filling confirmation method capable of confirming the filling degree during pouring without using a transparent form".

[0010]

FIG. 2 shows an embodiment in which a high resistance element 3 is fixed at a plurality of predetermined positions of different heights in a mold 1 and the high resistance elements 3 are connected in series to form a resistance circuit. . First, the concrete 2 is gradually and densely filled to a height at which each high resistance element 3 is fixed, each high resistance element 3 is sequentially embedded in the concrete 2, and a constant voltage V is applied to flow into the resistance circuit. The current Io is measured at each stage. The illustrated example shows a resistance circuit in which six high resistance elements 3 are connected. However, the number of high resistance elements 3 is not limited to the illustrated example. Next, using the mold 1 having the same shape as or the same shape as the current Io measured at the time of filling, concrete 2 is placed while gradually filling each high resistance element 3 in the same manner as at the time of filling, and a constant voltage V The pouring current Ic flowing through the resistance circuit according to the application is measured at each stage, and the pouring current Ic and the filling current Io are compared at each stage.

FIG. 2C shows the charging current Io (solid line) and the driving current Ic (dotted line) measured stepwise. The example shown is
It is shown that the pouring current Ic measured at the stage of pouring up to the height h2 is different from the corresponding filling current Io. From the comparison of both, there is an unfilled portion around the high resistance element 3 fixed at the height h2. I know that there is. When an unfilled portion is detected, stirring can be performed with a vibrator or the like until the pouring current Ic becomes equal to the filling current Io to increase the filling degree. Preferably, the high resistance element 3 is fixed to a portion where the concrete 2 is difficult to fill. For example, as shown in FIG. 2A, the high resistance element 3 is insulated and fixed to the reinforcing bar 6, and the concrete 2 is poured while confirming the filling degree around the reinforcing bar 6.

Further, by comparing the pouring current Ic measured when pouring the concrete 2 with the pre-measured filling current Io at each stage as shown in FIG. 2 (C), It is possible to determine at which stage the height of the cast concrete 2 is. However, only when it is confirmed that there is no unfilled part by comparing the current Ic during pouring and the current Io during filling at each stage after the start of pouring, the height increase due to the subsequent pouring of concrete 2 You can ask.

The embodiment of FIG. 3 shows a resistance circuit formed by connecting a plurality of high resistance elements 3 of the present invention. In the example shown in the figure, multiple 30kΩ metal film resistors are connected at equal intervals, and 68k at one end.
Connect a metal film resistor of Ω. By arranging resistors at equal intervals, it is possible to check the filling degree at even intervals.
Further, it can be confirmed that the concrete 2 was cast up to the upper end by connecting a large resistance to one end. The charging current Io and the driving current Ic flowing in the resistance circuit are measured by a pen-writing oscillographic recorder for measuring the voltage across both ends of the same 30 kΩ resistor connected to the circuit and displayed as shown in FIG. 2 (C).

[0014]

As described in detail above, the concrete filling confirmation method of the present invention uses a high resistance element fixed in a mold, and flows when a voltage is applied to the high resistance element embedded in the concrete upon placing. Since the configuration for obtaining the filling degree from the change in the current is used, the following remarkable effects are obtained. (1) By comparing the electric current at the time of pouring with the pre-measured electric current at the time of filling, the filling degree can be immediately obtained while pouring concrete. (2) Since the resistance element which is easily available is used, the filling degree of concrete can be confirmed with a small construction cost. (3) Since the presence or absence of the unfilled portion is determined by comparing the current values, no special skill is required for the filling confirmation work.

[Brief description of drawings]

FIG. 1 is an explanatory view showing the operation of the present invention.

FIG. 2 is an explanatory diagram of an embodiment of the present invention.

FIG. 3 is an explanatory diagram of a resistance circuit used in the present invention.

[Explanation of symbols]

1 Concrete pouring formwork 2 Concrete 3 High resistance element 6 Reinforcing bar.

Claims (4)

[Claims] 1. A high resistance element is fixed at a predetermined position to be embedded in concrete in a concrete pouring formwork, and when the concrete is densely filled in the formwork, the high resistance element is applied in response to application of a constant voltage. Measuring the filling current flowing through the resistance element, measuring the pouring current flowing through the high resistance element in response to the application of the constant voltage when pouring concrete into the mold, and the filling current. A concrete filling confirmation method, wherein the filling degree of the cast concrete is obtained by comparing with the pouring current. 2. A high resistance element is fixed to each of a plurality of predetermined positions of different heights in a portion to be embedded in concrete in the formwork, and the high resistance elements are connected in series to form a resistance circuit, When filling each of the high-resistance elements into the formwork stepwise while densely filling the concrete, the filling current flowing in the resistance circuit according to the application of a constant voltage is measured for each step, and the concrete is When placing each high resistance element in a mold while placing it stepwise, the placement current flowing through the resistance circuit according to the application of the constant voltage is measured for each step, and the filling current and A concrete filling confirmation method for obtaining a filling degree of the placed concrete at each of the predetermined positions by comparing the pouring current at each stage. 3. The concrete filling confirmation method according to claim 1, wherein the high resistance element is insulated and fixed to a reinforcing bar provided in the mold. 4. A high resistance element is fixed to a plurality of predetermined positions at different heights in a portion to be embedded in concrete in a concrete casting formwork, and the high resistance elements are connected in series to form a resistance circuit. Forming, measuring the filling current flowing through the resistance circuit according to the application of a constant voltage for each step when densely filling the high resistance element in a stepwise manner by filling the concrete into the formwork, When pouring concrete into the mold, the pouring current flowing through the resistance circuit according to the application of the constant voltage is measured, and the pouring current and the filling current measured at each stage are A concrete pouring height measuring method for obtaining the height of the poured concrete by comparing.