JP2869605B2 - 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 (ascending situation) 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 end position of the poured concrete, for example, a weight is attached to a tape with a scale, and the weight is dripped down into the stable liquid in the excavation hole with a sense of an operator, and the scale with the scale is attached. It is common to measure the position of the top of the concrete by stretching the tape. 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 problems, a top-end measuring device for cast concrete according to the present invention has a closed lower end and water or the like inside as shown in the embodiment in the drawings. And the hose 2 installed along the inner wall of the drilling hole 3 from the bottom to the upper end of the drilling hole 3 and the volume of the liquid 1 flowing out from the upper end opening 2b of the hose 2 The hose 2 is made of a flexible material that is crushed by the lateral pressure of concrete 5 placed in the excavation hole 3. The hose 2 is crushed. As a result, the volume or weight of the liquid 1 flowing out and contained in the measuring device 4 is measured to measure the position of the top end of the cast concrete 5.

[0006]

The hose 2 has a flexible structure in which the lower end 2a is closed, the liquid 1 such as water is injected into the inside, and the material can be crushed by the lateral pressure of the cast concrete 5 from the bottom to the top of the borehole 3. Since the measuring device 4 for measuring the volume or weight of the liquid 1 flowing out from the upper end opening 2b of the hose 2 is installed on the ground, When the hose 2 is crushed by the lateral pressure of the concrete 5, the liquid 1 in the crushed portion overflows and is stored in the measuring device 4. Therefore, the volume or weight of the liquid 1 in the measuring device 4 is measured,
By converting to the internal volume of the hose 2 (cross-sectional area x length), the concrete 5
Can be determined.

[0007]

Next, an embodiment of the present invention shown in the drawings will be described. FIG. 1 shows an overall view of a device for measuring the top of cast concrete according to the present invention. In the figure, reference numeral 2 denotes a hose installed in an excavation hole 6 excavated when constructing a cast-in-place concrete pile or the like. The lower end 2a of the hose 2 is hermetically sealed and blinded.
A liquid 1 (but usually water) having a higher specific gravity than the stabilizing liquid 6 in the inside is fully filled to the ground level. And
Normally, the hose 2 is attached to a side wall of a reinforced cage, not shown, and the reinforced cage is inserted into the drilled hole 3 so as to extend along the inner wall of the drilled hole 3 from the bottom to the upper end of the drilled hole 3. is set up. That is, the hose 2 has an overall length slightly longer than the depth of the borehole 3 and an inner diameter of about 10 to 100 m.
m, and is made of a flexible tube made of synthetic resin or the like that can be completely crushed by the lateral pressure of the concrete 5 cast into the excavation hole 3.

In the figure, reference numeral 4 denotes a measuring device for measuring the volume or weight of the liquid 1 flowing out of the upper end opening 2b of the hose 2, and is installed on the ground. The upper end opening 2 b of the hose 2 is installed toward the inside of the measuring device 4. The relationship between the volume (or weight) and the concrete placement position is marked and displayed on the measuring device 4 in advance. Therefore, when the concrete 5 is poured into the excavation hole 3, the hose 2 is crushed by the lateral pressure of the concrete 5 filling from the bottom of the excavation hole 3, and the liquid 1 in the crushed portion is crushed. Is the upper end opening 2b of the hose 2 on the ground
And overflows from the measuring device 4. Therefore,
Only by measuring the volume or weight of the liquid 1 in the measuring device 4, the top position of the cast concrete 5 can be determined and managed simply and in real time.

[0009]

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 can be simply and accurately measured in real time by the simple apparatus. Since the concrete can be poured accurately according to the measured value, the cost can be reduced and the cost can be reduced, and it is economical and contributes to the construction of a high quality, high strength cast-in-place concrete pile or the like.

[Brief description of the drawings]

FIG. 1 is an overall view of a top end measuring device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid 2 Hose 3 Drilling hole 2b Upper end opening 4 Meter 5 Concrete

──────────────────────────────────────────────────続 き Continuing on the front page (72) Eiji Sato, Inventor 2-5-1-14 Minamisuna, Koto-ku, Tokyo Inside the Technical Research Institute, Takenaka Corporation (72) Inventor Atsushi Okawara 2-5-1, Minamisuna, Koto-ku, Tokyo No. Takenaka Corporation Technical Research Institute Co., Ltd. (56) References JP-A-4-62227 (JP, A) JP-A-4-62226 (JP, A) (58) Fields studied (Int. Cl. ⁶ , DB (Name) E02D 15/04

Claims (1)

(57) [Claims] 1. A hose which is closed along its lower end and which is filled with a liquid such as water therein and which is installed along the inner wall of the drilling hole from the bottom to the upper end of the drilling hole, and the hose which flows out from the upper end opening of the hose. It consists of a measuring device installed on the ground to measure the volume or weight of the liquid, and the hose is made of a flexible material that is crushed by the lateral pressure of concrete poured into the drilling hole, and the hose is crushed. The top position of the poured concrete is measured by measuring the volume or weight of the liquid flowing out and stored in the measuring instrument.