JPH06257152A - Method and device for measuring height of concrete placing - Google Patents

Abstract

PURPOSE:To measure the top height at multiple points efficiently and economically in addition to the automatic, accurate and simple measurement of the top height of the underwater concrete during the placing, the cast-in-place concrete of mud replacement or the like. CONSTITUTION:A guide pipe 4 is stood within an area, in which concrete is placed, and a magnetic cursor 5 moved vertically along the guide pipe 4 is positioned on a top of the placed concrete, and a magnetic sensor 8 suspended in the guide pipe 4 detects the magnetic cursor 5. Height of the placed concrete is measured on the basis of the suspending-down quantity of the magnetic cursor 8 at the time of detection. The magnetic cursor 5 is pushed up by the concrete with a rise of the top height of the placed concrete.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for measuring a concrete pouring height (top height) in an underwater concrete construction method, a muddy water displacement cast-in-place concrete construction method or the like.

[0002]

2. Description of the Related Art Conventionally, the following method has been known as a method for measuring the casting height (top height) of underwater concrete.

Method by Red Using red having a weight at the lower end of the rope, the weight is suspended until the weight reaches the top of the concrete, and the length required for the suspension is read artificially by a scale.

Method using an acoustic sounder (Actual Kaihei 1-9
(See Japanese Patent No. 3504) The ultrasonic transmitter / receiver is suspended by a cord and the time until the ultrasonic wave from the ultrasonic transmitter / receiver is reflected from the concrete crown and received is measured. The distance to the top of the concrete is measured, and the height of the concrete top is calculated based on the amount of rotation of the motor while controlling the winding motor of the rope so that the distance becomes constant.

Method using pressure sensor (Japanese Patent Laid-Open No. 4-6
(See Japanese Patent No. 2227) A pipe with two pressure sensors attached at two upper and lower positions is erected in a poured concrete, and muddy water on the concrete is introduced and filled into the pipe, and in this state, the concrete pressure outside the pipe and the pipe The muddy water pressure inside is detected by each of two pressure sensors, the differential pressure is measured, and the crown height of the concrete is calculated from this differential pressure.

[0006]

However, in the method according to Red, it is inevitable that individual differences among measuring persons and reading errors occur. Although the method using the acoustic sounding machine described above can perform automatic measurement, it is difficult to control the height of the ultrasonic transmitter / receiver, and the measurement and control device becomes large in size, so that the cost is high and it is not suitable for simultaneous measurement of multiple points. With the method using the pressure sensor, stable high accuracy cannot be obtained.

Therefore, an object of the present invention is to make it possible to automatically and accurately and easily measure the top heights of underwater concrete, muddy water displacement cast-in-place concrete, and the like during pouring, and also to obtain multipoint crown heights. It is an object of the present invention to provide a concrete pouring height measuring method and a device therefor, which can measure the height efficiently and economically.

[0008]

In the measuring method according to the present invention, a guide pipe is erected in a region where concrete is placed, and a magnetic cursor which moves up and down along the guide pipe is placed on the top of the placed concrete. A magnetic cursor is positioned and suspended in the guide tube to detect the magnetic cursor, and the concrete pouring height is measured from the suspended amount of the magnetic sensor at the time of detection. The magnetic cursor is pushed up by the concrete as the top height of the cast concrete rises.

The measuring device according to the present invention comprises a guide pipe installed upright in an area where concrete is placed, and a guide pipe which is vertically slidably fitted so as to follow the top end of the placed concrete. A magnetic cursor, a magnetic sensor for detecting the magnetic cursor, a suspension member for suspending the magnetic sensor in a guide tube, a measuring device for measuring the suspension amount by the suspension member, and a magnetic sensor It is composed of a signal transmission system for transmitting the detection signal, and an arithmetic means for calculating the top height of the pouring concrete from the hanging amount when the detection signal is transmitted from the signal transmission system.

[0010]

In the method and apparatus according to the present invention, when concrete is poured, the magnetic cursor is raised along the guide tube according to the height of the top of the concrete, so that the magnetic cursor is always on the top of the poured concrete. To position. When the magnetic sensor is suspended and moved in the guide tube, the magnetic sensor is responsive to the magnetic cursor and outputs a detection signal. Since the hanging amount of the magnetic sensor is measured at all times or during its movement, the ceiling height of the cast concrete can be obtained from the hanging amount when the detection signal is obtained from the magnetic sensor. When measuring multiple points, even if the same number of guide tubes and magnetic cursors as the number of measuring points are required, it can be economically measured by one measuring unit (consisting of a magnetic sensor, its hanging mechanism, a hanging amount measuring device, and an arithmetic means). .

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings. As shown in FIG. 1, the case where the underwater concrete 3 is poured into the caisson formwork 1 installed in water at a plurality of locations by the concrete placing pipes 2 will be described as an example. As shown in FIGS. 2 and 3, a non-magnetic guide tube 4 is erected vertically at a required place in the caisson form 1, and a ring-shaped magnetic cursor 5 is slidably fitted on the outer circumference of each guide tube 4. The magnetic cursor 5 is moved down along the guide tube 4 to the top of the underwater concrete 3. In this case, all of the guide pipes 4 are still for measuring the top height of the underwater concrete 3, but in part, the concrete cover height of the concrete placing pipe 2 is measured. Intended to stand in the vicinity of the concrete placing pipe 2, and for others, between the concrete placing pipe 2 and the concrete placing pipe 2 and around the caisson formwork 1 for the purpose of measuring the flow gradient of concrete. Stand up.

FIG. 4 shows a cross section of a part of one guide tube 4 and a cross section of the magnetic cursor 5, and FIG. 5 shows an appearance of a similar part. The magnetic cursor 5 has a hollow ring structure with a non-magnetic outer shell so that the specific gravity of the magnetic cursor 5 is lighter than that of the underwater concrete 3 so that the magnetic cursor 5 does not sink into it even when it is in a flowing state. Accordingly, when the top height of the underwater concrete 3 rises as the casting of the underwater concrete 3 progresses, the magnetic cursor 5 is pushed up by the underwater concrete 3 and is always positioned on the top. On the inner peripheral surface of the cavity of this magnetic cursor 5,
The magnet 6 is fixed in a continuous continuous ring shape or a divided ring shape, and the magnetic flux of the magnet 6 reaches the inside through the guide tube 4 which is a non-magnetic material. The guide pipe 4 is provided with a large number of concrete introduction holes 7 in its peripheral wall so that the underwater concrete 3 can be introduced and buried therein.

In order to detect the magnetic cursor 5 from the inside of the guide tube 4, the magnetic sensor 8 is attached to the suspension member 9 such as a wire or a chain.
By the working stage 10 on the caisson formwork 1 (Fig. 1)
Hanging in the guide tube 4 from. The hanging member 9 is wound around the reel 12 by the rotation of the winding motor 11 shown in FIG. 6 installed on the work stage 10. Winding motor 1
The rotation amount of 1 is measured by a known measuring device using a rotary encoder or the like. In the case of this example, the suspension height of the magnetic sensor 8, that is, the current height of the magnetic sensor 8 is calculated from this rotation amount by a computer or the like. It can be measured by calculation by a calculation means.

A cable that is integral with or parallel to the suspension member 9 is connected to the magnetic sensor 8, and a detection signal from the magnetic sensor 8 is transmitted to the computing means such as the computer through the cable. Note that if the magnetic sensor 8 is suspended by the cable itself, a special suspension member such as a wire or a chain becomes unnecessary.

The top height of the underwater concrete 3 having the above-mentioned structure is measured as follows. The winding motor 11 is rotated to feed the suspension member 9, and the magnetic sensor 8 is lowered while measuring the amount of rotation. When the magnetic sensor 8 approaches the magnet 6 of the magnetic cursor 5 and responds to this, a detection signal is output from the magnetic sensor 5 and transmitted to a computing means such as a computer through a cable. At this time, the calculation means fetches the measurement data of the measuring device for measuring the rotation amount of the winding motor 11, and calculates the current height of the magnetic sensor 8 from the fetched data. Since the magnetic cursor 5 is always located on the top of the underwater concrete 3, the calculated height represents the top height of the underwater concrete 3 at the penetration position of the guide tube 4.
In addition, a guide pipe 4 installed near the concrete placing pipe 2
In the case of, the concrete cover height of the concrete placing pipe 2 can be obtained from the calculation result of the top height.

By changing the guide tube 4 for suspending the magnetic sensor 8 one after another and repeating the same measurement and calculation, it is possible to perform multi-point measurement with one measuring unit, and also to obtain the crown height between the measuring points. The gradient of the top end surface of the underwater concrete 3 can also be calculated from the difference in height by the same calculation means.

Although the magnet 6 is installed in the cavity of the magnetic cursor 5 in FIG. 4, it can be measured in the same manner as above even if it is fixed to the outside of the magnetic cursor 5 as shown in FIG.

Further, as shown in FIG.
Is formed as a hollow sphere and a magnet 6 is provided therein, and a guide cavity 4a for the magnetic cursor 5 and a guide cavity 4b for the magnetic sensor 8 are formed in one guide tube 4 by partition walls 4c. Alternatively, if two guide tubes for separately guiding the magnetic cursor 5 and the magnetic sensor 8 are provided in parallel, it is possible to accurately prevent the magnetic cursor 5 from being immersed in the underwater concrete 3.

In the above example, the magnetic cursor 5 provided with the magnet 6 is used and detected by the magnetic sensor 8 of the magnetic sensitive type. However, the magnetic sensor is of the magnetic sensitive type, that is, generated from the magnetic sensor 8 side. In the case of the type that is sensitive to the magnetic flux generated when the adjacent magnetic material is changed, it is not necessary to provide the magnetic cursor 5 with the magnet 6. Further, the present invention is not limited to the underwater concrete construction method, but can be applied to a muddy water replacement cast-in-place concrete construction method or the like.

[0020]

As described above, according to the present invention, the magnetic cursor is moved up along the guide tube and is always positioned on the top of the cast concrete as the height of the top of the concrete rises. The magnetic sensor suspended in the guide pipe detects the magnetic cursor in a non-contact manner. Therefore, it is possible to obtain the ceiling height of the concrete poured from the suspension amount when the detection signal is obtained from the magnetic sensor. it can. Therefore,
It is possible to automatically and accurately and easily measure the top height of underwater concrete during pouring or cast-in-place concrete with muddy water displacement. Further, in the case of multipoint measurement, it is economical to mount a magnetic cursor on each guide tube and to use one measuring unit (consisting of a magnetic sensor, its hanging mechanism, a hanging amount measuring device and a computing means). Can be measured.

[Brief description of drawings]

FIG. 1 is a front view showing a construction example of an underwater concrete construction method to which the present invention is applied.

FIG. 2 is a front view showing an example of the method according to the present invention applied to the construction example.

FIG. 3 is a plan view of the same.

FIG. 4 is a sectional view of a main part of the above.

FIG. 5 is an external perspective view of the same portion.

FIG. 6 is a diagram showing a suspension mechanism of a magnetic sensor.

FIG. 7 is a diagram showing a measurement example in which a magnet is provided outside a magnetic cursor.

FIG. 8 is a cross-sectional view showing an embodiment in which a magnetic cursor has a spherical shape and is arranged in a guide tube.

[Explanation of symbols]

 1 Caisson formwork 2 Concrete placing pipe 3 Concrete 4 Guide pipe 5 Magnetic cursor 6 Magnet 8 Magnetic sensor 9 Suspension member 11 Winding motor

Claims (3)

[Claims] 1. A guide pipe is erected in an area where concrete is placed, and a magnetic cursor which moves up and down along the guide pipe is positioned on the top end of the placed concrete and is suspended in the guide pipe. A concrete pouring height measuring method characterized by detecting a magnetic cursor with a magnetic sensor and measuring the pouring height of concrete from the amount of suspension of the magnetic sensor at the time of detection. 2. The concrete pouring height measuring method according to claim 1, wherein the magnetic cursor is pushed up by the concrete as the top height of the pouring concrete rises. 3. A guide tube installed upright in an area where concrete is poured, and a magnetic cursor fitted vertically slidably on the guide tube so as to follow the top end of the placed concrete. A magnetic sensor for detecting the magnetic cursor, a suspension member for suspending the magnetic sensor in the guide tube, a measuring device for measuring the suspension amount by the suspension member, and a detection signal from the magnetic sensor. A concrete pouring height, which comprises a signal transmission system for transmitting and a calculating means for calculating a ceiling height of the pouring concrete from the hanging amount when the detection signal is transmitted from the signal transmission system. Measuring device.