JP2869604B2 - Top measuring device for cast concrete - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to the construction of cast-in-place concrete piles and continuous underground walls (hereinafter referred to as high-strength cast-in-place concrete piles). The present invention relates to a top end measuring device for measuring a position in real time.

[0002]

2. Description of the Related Art When constructing a cast-in-place concrete pile or the like, concrete placement work is performed while measuring the position of the top of concrete placed in an excavation hole. Conventionally, as a method of measuring the top position of cast concrete, for example,
A method of attaching a weight to a tape with a scale, dropping the weight into the stable liquid in the drilling hole with the sense of an operator, stretching the tape with the scale, and measuring the position of the top of the concrete. Generally done. In addition, a wire attached with a weight is dripped into the stable liquid in the excavation hole, and as soon as it penetrates into the poured concrete, the vertical motion of hoisting the weight is performed at intervals of about 3 to 10 seconds. A method of continuously measuring the top position of cast concrete by automatic control is also used. In this case, whether the weight has penetrated into the concrete is confirmed by detecting the change in the weight of the weight due to the specific gravity difference between the stable liquid and the concrete in the drilling hole and the resistance of the weight to penetrate into the concrete. By doing.

[0003]

The above-described measuring method is very troublesome because it is a complete manual operation, and it is performed with a sensible scale. Difficult to measure. Although the measuring method is automated, there is a problem that the apparatus is complicated because continuous up and down movements need to be performed periodically and reliably, and the manufacturing cost of the apparatus increases. However, these points are issues to be solved.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an apparatus for measuring the top of cast concrete, which has a simple and simple mechanism and can accurately measure the position of the top of cast concrete.

[0005]

As a means for solving the above-mentioned problem, a top-end measuring device for cast concrete according to the present invention has a detector 1 attached to the tip as shown in the embodiment in the drawings. A wire 2, a winding device 4 for winding the other end of the wire 2 via an encoder 3, and a display 5 for displaying data of the winding device 4, and a detector for detecting the tip of the wire 2. 1 is suspended in the excavation hole 6 and stopped at a predetermined depth, and when the top end position of the cast concrete 7 reaches the detector 1 and the detector 1 is turned on, the winding is performed based on the input signal. The motor 8 of the take-off device 4 is operated, the length of the wound wire 2 is measured by the encoder 3, and the detector 8 is turned off at the same time as the motor 8 is turned off.
Is stopped, and the winding amount of the wire 2 is reduced to the concrete 7
Is displayed on the display meter 5 as the top end position.

[0006]

The detector 1 is attached to the tip of the wire 2 and the other end is attached to the winding device 4 via the encoder 3 so as to be wound. Therefore, if the detector 1 is suspended in the stable liquid 10 of the drilling hole 6 and stopped at a predetermined depth by its own weight of the attached weight 1b, the detector 1 is gradually driven into the drilling hole 6. The position of the top of the concrete 7 which has risen rises to reach the detector 1 at last, and the detector 1 is pushed by the top of the concrete due to the specific gravity difference between the cast concrete 7 and the stabilizing liquid 10 to be turned on. . The winding device 4 based on the input signal by the ON operation of the detector 1
The motor 8 is operated, and the length of the wire 2 wound by the operation of the motor 8 is measured by the encoder 3. When the detector 1 pulled up by the wire 2 is slightly separated from the top of the concrete 7, the detector 1 is turned off and the motor 8 is stopped. The winding amount of the wire 2 at this time is displayed on the indicator 5 as the top position of the concrete 7 to be poured, and the position of the top of the concrete 7 placed in the excavation hole 6 is automatically and accurately detected in real time. Is measured.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG.
FIG. 1 shows an overall view of an apparatus for measuring a top end of cast concrete according to the present invention. In the figure, reference numeral 2 denotes a wire, and a detector 1 such as a proximity switch is attached to a tip of the wire. Details of the proximity switch are shown in FIG. Basically, top lid 1
a and a weight 1b, and the weight 1b is a vertical support rod 1
e slidably suspends the upper lid 1a.
A switch unit 1c is installed downward at a substantially central position on the upper lid 1a, and an operation unit 1d is installed on the weight 1b so as to protrude upward at a position facing the switch unit 1c. Normally, the weight 1b is suspended from the upper lid 1a so that the operation unit 1d does not directly touch the switch unit 1c. And
When the weight 1b is pushed up from below by the top end of the cast concrete 7, the operation unit 1d is switched to the switch unit 1.
In this configuration, the detector 1 serving as a proximity switch is turned on in the vicinity of c.

In the drawing, reference numeral 4 denotes a motor 8 for winding the wire 2
Is a winding device having a basic configuration. The winding device 4 has an encoder 3 built therein. Therefore, the other end of the wire 2 inserted in the excavation hole 6 is configured such that it can be automatically wound on the ground by the pulley 9 and then automatically by the motor 8 via the encoder 3.

In the drawing, reference numeral 5 denotes a display connected to the winding device 4, and the winding amount (length) of the wire measured by the encoder 3 of the winding device 4 is displayed as data. ing. Therefore, the detector 1 which is a proximity switch at the end of the wire 2 is dropped into the stable liquid 10 in the excavation hole 6 by its own weight of the weight 1b, and starts measuring the top position of the cast concrete 7 Pause at depth. When the top position of the concrete 7 to be poured into the excavation hole 6 gradually rises and reaches the detector 1, the concrete 7 due to a specific gravity difference between the concrete 7 and the stabilizing liquid 10.
The detector 1 is turned on by the operation unit 1d of the weight 1b pushed up by the top end of the detector 1b. The motor 8 of the winding device 4 is started based on the input signal of the ON operation, and the length of the wound wire 2 is measured by the encoder 3. When the weight 1b thus lifted is separated from the top end of the concrete 7, the detector 1 is turned off, and at the same time, the motor 8 is stopped. The winding amount of the wire 2 during that time is the top position (depth) of the concrete 7
Is displayed on the display meter 5 as a change. Therefore, since the position of the top of the cast concrete 7 is always accurately and automatically measured in real time, the top of the concrete 7 can always be properly grasped and managed based on this display.

[0010]

According to the apparatus for measuring the top of cast concrete according to the present invention, the position of the top of concrete poured into the excavation hole is automatically and accurately measured in real time by the simple apparatus. Since the concrete can be poured accurately according to the display, it is possible to reduce the cost, and it is economical and contributes to the construction of a high-quality cast-in-place concrete pile with high strength.

[Brief description of the drawings]

FIG. 1 is an overall view showing a measuring device of the present invention.

FIG. 2 is an enlarged view showing a detector.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Detector 2 Wire 3 Encoder 4 Winding device 5 Indicator 6 Drilling hole 7 Concrete 8 Motor

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E02D 15/04

Claims (1)

(57) [Claims] A wire having a detector attached to a tip thereof;
A winding device for winding the other end of the wire via an encoder, and a display device for displaying data of the winding device, wherein the detector at the tip of the wire is suspended in a borehole and has a predetermined depth. Stopped, the top position of the poured concrete reaches the detector, and the detector is turned on, whereby the motor of the winding device is operated based on the input signal, and the length of the wound wire is reduced. It is measured by the encoder, at the same time the detector is turned off, the motor is stopped, and the winding amount of the wire is displayed on the indicator as the top position of the cast concrete. Top end measuring device.