JPH10196113A - Concrete-placing control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control concrete charging speed to a large-sized wall body, etc., at a real time by utilizing the detection of a top end by a wave motion. SOLUTION: Relationship between the place 4 of the top end of placed concrete 3 in a building space 2 and concrete charging speed is set to an adjusting device 10. The place of the top end is measured by a time when a wave 9c transmitted from the top section of the space 2 is reflected by the concrete top end 4 in the space 2 and returned. Laser beams are used preferably as the wave for measurement. The value of the measured place is transmitted to the adjusting device 10 as a top-end place signal. Concrete charging speed to the top-end place signal is computed from the relationship by the adjusting device 10, and a control signal corresponding to the computed charging speed is generated. The control signal is added to a variable-speed charging means 5, the concrete charging speed is adjusted and concrete placing speed is controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete placement control method, and more particularly to a concrete placement method for controlling the concrete introduction speed to a large wall or the like of a submerged box in real time based on a measured value of a concrete top position already placed. It relates to a control method.

[0002]

2. Description of the Related Art Referring to FIG. 5, when a concrete 3 is poured into a construction space 2 for a large wall such as a side wall 1a of a submerged box 1, a concrete top 4 in the construction space 2 is formed.
Measure the position of the concrete and manage the concrete placement. In the case of a typical submerged box 1, first, in a production yard or a dock of a factory, for a side wall 1a as a hollow box component, a middle wall.
The building space 2 for 1b, the upper floor 1c, and the bottom floor 1d is made of an iron plate or the like. After casting concrete into the construction space 2 to construct the walls of the side walls 1a, the middle wall 1b, the upper floor panel 1c, and the bottom floor panel 1d to form a hollow box, the hollow box is placed at the installation position. Tow and buried at that location.

To measure the top end 4, (1) a measurer 20 suspends a weight 21 and reaches the top end 4 by a method called red measurement as shown in FIG. 5 (B1). The top position is determined by reading the scale of the tape 22 with the scale at that time, and (2) based on the differential pressure between the atmospheric pressure and the concrete pressure as shown by the differential pressure gauge 23 in FIG. 5 (B2). Conventionally, a method of detecting, (3) a method called a capacitance type by a top end detecting device 24 utilizing capacitance as shown in FIG. 6 is used. The illustrated capacitive detection device 24 has two capacitance lines 25.
In principle depends on whether there is air or concrete between the two lines 25. Using a bow member 27 and a guide line 28 protruding from the instrument main body 26, a spring 29
Then, the capacitance line 25 is insulated and stretched from the main body 26 under tension with the Teflon ring 30, and the capacitance line 25 is connected to the meter input terminal 32 by the jumper line 31. The guide line 28 is removed after the capacity line 25 is stretched.

[0004]

However, (1) Red measurement depends on human senses and is liable to cause a measurement error. Moreover, since it is not mechanical automatic measurement, construction management and adjustment of concrete placing speed etc. It has the disadvantage that feedback to control is difficult. (2) The method based on the differential pressure between the atmosphere and the concrete has a disadvantage that it is necessary to provide a large number of differential pressure gauges 23 or to move the concrete following the rise of the concrete top 4, which makes the equipment and operation complicated. (3) The capacitance type has a disadvantage that the detection device is expensive and costly, and that maintenance such as disconnection of the capacitance line or the like is troublesome.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a concrete placement control method utilizing the detection of a concrete top by wave motion. The control method of the present invention solves the above disadvantages of the prior art.

[0006]

Referring to the embodiment shown in FIG. 1, a concrete placing control method according to the present invention comprises a construction space 2;
Of concrete placed in the construction space 2 at the top position 4
Is set in the adjusting device 10, and the wave 9c transmitted from the top of the space 2 is reflected by the concrete top 4 in the space 2 and returns according to the time required for the top position. Sends the top position signal to the adjustment device 10,
The concrete pouring speed is calculated by the adjusting device 10 from the relational expression with respect to the top position signal, and a control signal corresponding to the calculated pouring speed is sent to the variable speed pouring means 5 to control concrete pouring.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG.
FIG. 4 shows a flowchart of the operation of the embodiment in which the detection is performed by the laser light range finder 9. Referring to the figure, when the control of concrete input is started, in step 401, in this case, the distance between the top of the construction space 2 and the concrete top 4 is measured by the distance meter 9 by the wave 9c which is a laser beam. Then, the position of the top 4 is detected, and a top position signal is transmitted from the distance meter 9 to the adjusting device 10 in step 402. However, the wave used for detecting the concrete top 4 in the present invention is not limited to laser light. For example, visible light or directional ultrasonic waves may be used.

In the adjusting device 10, a relational expression between the position of the concrete top 4 and the concrete charging speed is set.
For example, as shown in FIG. 3 (C), this relational expression divides the height of the concrete top 4 in the construction space 2 into a plurality of regions, for example, ranges 1 to 4, and inputs concrete to each region. The speed (m ³ / min) can be in the form of an assignment table. However, the relational expression used in the present invention is not limited to the table type, but may be a numerical expression. In step 403, when a required amount of concrete is put into the construction space 2 from the position of the top end 4, and it is determined that the placing of the side wall 1a having the required height is completed, the concrete placing work is finished.

If the driving is not completed, the control proceeds to step
Proceeding to 404, the adjusting device 10 finds the concrete input speed corresponding to the top position signal from the distance meter 9 at step 404, and sends a control signal corresponding to the input speed to the concrete input means 5. In the embodiment shown in FIGS. 1 and 2, the dosing device 5 has a control circuit 6 and a motor-driven pump 7, and the control circuit 6 determines in step 405 the required concrete dosing speed based on the control signal from the adjusting device 10. The rotation speed of the motor drive pump 7 is determined. In step 406, the control circuit 6 rotates the pump 7 at the rotation speed, and
Builds concrete at the required input speed set in the space 2
To

Control then returns to step 401 to repeat the above operation. In this way, the concrete placing can be controlled by utilizing the concrete top detection by the wave motion. Moreover, according to the concrete placing control method of the present invention, the problems of measurement errors due to human senses and obstacles to the realization of feedback control in the prior art are eliminated, and the operation of moving the differential pressure gauge and the expensive and maintenance-intensive capacitive sensing are eliminated. No equipment is required, and the disadvantages of the prior art are solved.

In this manner, the object of the present invention is to provide a "concrete placement control method utilizing the detection of a concrete top by wave motion".

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction space 2 of the embodiment shown in FIG. 1 corresponds to the side wall 1a of the submerged box 1. A guide tube 1e of a concrete charging hose 8 is mounted on the top thereof, and a distance meter is provided on the top wall. Nine support devices 9e are provided. The distance meter 9 in the illustrated example is
Transmitter 9a for transmitting wave 9c and receiver for receiving reflected wave
9b. Preferably, the measured value output of the distance meter 9 is a digital signal, and the adjusting device 10 and the concrete charging means 5 such as a concrete pump are of a digital control type.

Preferably, the adjusting device 10 is a computer having a display means 11 as shown in FIGS. In FIG.
The set value of the concrete charging speed is input and displayed as a setting screen 12, and the contents of the table are displayed as a graph 13. When the height of the construction space 2 is 10 m, the height is divided into four ranges, that is, ranges 1 to 4. For example, a concrete injection speed corresponding to a casting speed of 20 cm / min for a range of 5 m to 9.9 m is set. Assign. When the position of the top end 4 reaches a predetermined height close to the required height of 10 m, the concrete charging speed is reduced, and finally the automatic stop is performed smoothly. Also,
A display 14 of the current value of the top position during the concrete placing operation can also be provided.

As is apparent from the illustrated embodiment, according to the present invention, the elevation of the top end 4 as a result of concrete injection can be automatically and quickly fed back to a construction device such as a concrete pump. In addition, there is no need to move the sensor unit so as to follow the rising of the top end 4, and the equipment cost can be reduced.

[0015]

As described in detail above, the concrete placing control method of the present invention has the following remarkable effects since the concrete top position is detected by the wave motion and sent to the adjusting device to control the concrete charging device. .

(A) The concrete feeding speed can be controlled in real time according to the concrete top position. (B) A feedback control system can be configured using a commercially available relatively inexpensive device. (C) It is possible to avoid measurement errors due to human senses and to enhance control accuracy. (D) Labor saving can be achieved by automation of control. (E) The work efficiency can be improved by optimizing the concrete charging speed.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of a concrete placing control method according to the present invention.

FIG. 2 is a block diagram of the control element of FIG.

FIG. 3 is an explanatory diagram showing a display example on the display device of FIG. 2;

FIG. 4 is a flowchart of the control method in FIG. 1;

FIG. 5 is an explanatory view of a conventional technique of placing concrete in a buried box.

FIG. 6 is a schematic perspective view of a capacitive type top end position measuring device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Sinking box 2 ... Construction space 3 ... Concrete 4 ... Top end 5 ... Injection means 6 ... Control circuit 7 ... Motor driven pump 8 ... Hose 9 ... Wave type distance meter 10 ... Adjustment device 11 ... Display 12 ... Setting screen 13 … Graph display 14… Present value display 20… Measurer 21… Weight 22… Scaled tape 23… Differential pressure gauge 24… Capacitance type top end detection device 25… Capacitance line 26… Meter body 27… Arch member 28… Guide line 29… Spring 30 Teflon ring 31 Jumper wire 32 Instrument input terminal.

Claims (6)

[Claims] In the concrete placing by a variable speed charging means into a construction space, a relational expression between the top position of the concrete already placed in the construction space and the concrete charging speed is set in an adjusting device, and the top of the space is set. A top position signal corresponding to the top position obtained by the time required for the wave transmitted from the top to be reflected at the top of the concrete in the space and returned is sent to the adjusting device. A concrete placing control method comprising: calculating a charging speed from the relational expression; and transmitting a control signal corresponding to the calculated charging speed to the variable speed charging means to control a concrete charging speed. 2. The concrete placement control method according to claim 1, wherein said variable speed input means is a concrete pump. 3. The concrete placement control method according to claim 1, wherein the wave transmitted from the top of said space is visible light or laser light. 4. The method according to claim 1, wherein the wave transmitted from the top of the space is a directional ultrasonic wave. 5. The method according to claim 1, wherein said construction space is a space for forming a concrete wall of a submerged box. 6. The control method according to claim 1, wherein the relational expression is defined as a relation between a plurality of concrete top position height areas assumed in the construction space and a concrete input speed assigned to each of the height areas. Becomes a concrete casting control method.