JP2000282688A - Concrete placing work method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide noise-controlled concrete placing work method suiting high fluid concrete placement and allowing quick wide-range concrete placement at a time. SOLUTION: Placement chutes 3 are mounted at openings provided at the lower part of a concrete container 2 and a rotational shaft 31 having spiral partitions 32 therearound are rotationally mounted inside the placement chutes 3. Ready-mixed concrete 100 is therefore placed while rotating the rotational shaft 31 and the partitions 32 with its dead weight and stirring and falling itself. Concrete having a nature as designed can be placed quickly in a wide range, eliminating noises due to the use of a force feed pump.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete casting method which is suitable for placing high-fluidity concrete, can perform concrete placement widely and quickly at a time, and suppresses noise. .

[0002]

2. Description of the Related Art High fluidity concrete has high fluidity and appropriate material separation resistance by means of adding high-performance water reducing materials and thickeners, and increasing the proportion of powder in a binder. It is a concrete that has a good filling property. Therefore, in addition to being used for the production of a complex body,
It is used when it is necessary to cast a large amount in a wide area.

Conventionally, as a method of casting high-fluidity concrete, a method of pumping using a pump has been generally used. At this time, as a condition for stably pumping and pouring the high-fluidity concrete, for example, when a 4 to 5 inch pipe is used as the pipe for pumping, the total length of the pipe is 300 m or less, and Maximum free fall height and maximum horizontal flow distance are less than 5m and 1 respectively
The standard is 5 m or less.

[0004]

When an oblique chute is used for placing high-fluidity concrete, the high-fluidity concrete can be poured over a wide area and quickly. Material could separate. Therefore, it was not possible to cast high-fluidity concrete using an oblique chute. Also, in the case of pumping, the pressure at the time of pumping was high because high-fluid concrete had high viscosity. Therefore, in the conventional method described above, the load applied to the pump during pumping increases, and the properties of the highly fluid concrete may change during casting. Further, there is a problem that noise is generated from the pump during the pumping of the high-pressure concrete and the high-pressure concrete.

In view of the above circumstances, the present invention provides a concrete placing method in which the properties of concrete hardly change at the time of placing, despite the use of an oblique chute without using a pump. Aim.

[0006]

In order to solve the above-mentioned problems, the invention according to claim 1 provides a rotary shaft (31) having a partition (32) spirally wound therearound and fixed to a chute (for example, a driving chute). 3) rotatably mounted inside
Further, the concrete casting method is characterized in that concrete is conveyed obliquely downward by using the chute and cast.

According to the first aspect of the present invention, the concrete is dropped by its own weight while rotating the rotating shaft and the partition and agitating itself. In addition, since the inside of the chute is partitioned by the partition in the vertical direction, the pressure applied to the concrete at the time of falling is significantly smaller than that in the related art. Therefore, unlike the conventional oblique chute, material separation hardly occurs at the time of casting, and the chute is hardly clogged. For this reason, for example, even when high-fluidity concrete is cast, concrete having the material ratio, that is, the property as designed can be cast over a wide range and quickly. In addition, noise is reduced because no pressure pump is used.

Accordingly, the construction period required for placing concrete can be shortened, so that construction can be performed more economically.

The concrete in the chute may be made to flow by forcibly rotating the rotating shaft by a power source (for example, a motor 33) provided outside. In this case, the rotating shaft and the partition are forcibly rotated by the power source, so that the concrete can be efficiently poured even when the viscosity of the concrete is high. Also, since the rotation speed of the rotating shaft and the partition can be controlled, the concrete placing speed can be easily controlled.

The invention described in claim 1 is the same as the invention described in claim 2.
As described in (1), the chute may be branched into a plurality at the tip end side (for example, the driving chute 4), and concrete may be poured into a plurality of locations at the same time. In this case, concrete can be cast over a wider area. Here, the separation distance at the tip of each branch is adjusted in consideration of the fluidity of the ready-mixed concrete, the shape of the casting location, and the like.

According to the first or second aspect of the present invention, as described in the third aspect, the concrete container (2) for holding the concrete conveyed by the chute may be rotatable. . in this case,
Since the concrete pouring point can be changed without moving the position of the concrete container, the concrete pouring range can be more easily expanded.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A concrete placing mechanism 1 for realizing a concrete placing method according to the present invention with reference to the drawings.
Will be described in detail. FIG. 1 is a schematic perspective view of the concrete placing mechanism 1, and FIG. 2 is a schematic bottom view illustrating the configuration of a driving chute 4, which is a component of the concrete placing mechanism 1. FIG. 3 is a schematic diagram illustrating a modified example of the driving chute 3 which is a component of the concrete placing mechanism 1.

First, the configuration of the concrete placing mechanism 1 will be described. The concrete casting mechanism 1 is roughly composed of a concrete container 2 for holding concrete therein, and a driving chute 3 and a driving chute 4 attached to an opening at a lower portion of the concrete container 2 for driving concrete into a predetermined location. It is configured.

The concrete container 2 is a container for holding ready-mixed concrete 100 such as high-fluidity concrete, and is rotatably supported on a ground or the like by a support portion 5 which is a well-known rotating mechanism. Further, the capacity is changed according to the amount of ready-mixed concrete 100 required for one casting.

The driving chute 3 is attached to the concrete container 2 obliquely downward. Further, inside the driving chute 3, there is provided a rotary shaft 31 having a partition 32 wound and fixed in a spiral shape. This rotating shaft 3
The 1 and the partition 32 are made of, for example, steel and have a strength enough to withstand the pressure applied when the fresh concrete flows down the inside of the driving chute 3 according to the operation described later.

The driving chute 4 has a structure in which two driving chutes 3 are attached to the front end of the driving chute 3 so that the front ends are branched. Here, the tips of the branches are separated from each other to some extent. The separation distance is adjusted in consideration of the fluidity of the ready-mixed concrete 100, the shape of the casting location, and the like. The connecting portion of the three driving chutes 3 is firmly fixed using a fixing tool 41 as shown in FIG.

Next, the operation of the concrete placing mechanism 1 will be described. The ready-mixed concrete 100 inside the concrete container 2 falls down inside the driving chutes 3 and 4 by its own weight.

Here, since there is a rotating shaft 31 provided with a spiral partition 32 inside the driving chute 3, the ready-mixed concrete 100 causes the rotating shaft 31 and the partition 32 to rotate while stirring itself. While falling. In addition, the inside of the driving chute 3 is, in the vertical direction,
Since the partition is partitioned by the partition 32, the pressure applied to the ready-mixed concrete 100 at the time of dropping is much smaller than in the past. Therefore, unlike the conventional oblique chute, material separation hardly occurs at the time of driving, and the driving chutes 3 and 4 are hardly clogged.

Therefore, concrete having properties as designed can be cast over a wide area and quickly.

Further, since the tip of the driving chute 4 has a branched shape, the fresh concrete 100 can be spread over a wider area.
Can be cast.

Further, by placing the ready-mixed concrete 100 while rotating the concrete container 2, or by rotating the concrete container 2 every time one cup of ready-mixed concrete 100 is placed, the ready-mixed concrete 1 can be easily prepared.
00 can be extended.

Further, the noise generated when the ready-mixed concrete 100 is poured is also significantly reduced because no pump is used.

As described above, according to the concrete placing mechanism 1 according to the embodiment of the present invention, the driving chute 3 is attached to the opening provided at the lower part of the concrete container 2, and further, the spiral is inserted inside the driving chute 3. The rotating shaft 31 having a partition 32 around the periphery is rotatably attached, so that the ready-mixed concrete 100 falls under its own weight while rotating the rotating shaft 31 and the partition 32 and stirring itself. Is established. For this reason, concrete having the properties as designed can be cast over a wide area and quickly, and noise due to the use of the pressure pump is eliminated. Therefore, even if high-fluidity concrete is used as the ready-mixed concrete 100, it can be poured over a wider area and quickly without impairing its properties.

Further, since the concrete container 2 is rotatably installed, the point of placing the ready-mixed concrete 100 can be changed without moving the position of the concrete container 2. Therefore, the range of placing the ready-mixed concrete 100 can be more easily expanded.

Therefore, the construction period required for placing the ready-mixed concrete 100 can be shortened, and the construction can be performed more economically.

The present invention is not limited to the present embodiment, and can be arbitrarily modified without departing from the gist.

For example, as shown in FIG. 3, a motor 33 (power source) is mounted outside the driving chute 3 and the power is transmitted to the rotating shaft 31 via a power transmission mechanism 34 such as a gear or a belt. Is also good. In this case, since the rotating shaft 31 and the partition 32 rotate using the motor 33 as a power source, even when the viscosity of the ready-mixed concrete 100 is high,
The fresh concrete 100 can be efficiently placed. Also,
The rotation shaft 31 and the partition 32 are controlled by the rotation speed of the motor 33.
Since the rotation speed of the concrete can be controlled, the casting speed of the ready-mixed concrete 100 can be controlled.

Further, when a plurality of concrete placing mechanisms 1 are used in one placing location, the ready-mixed concrete 100 can be placed more quickly and widely.

[0029]

According to the first aspect of the present invention, concrete is dropped and poured by its own weight while rotating the rotating shaft and the partition and stirring itself. Hardly cause material separation during installation,
Further, it is difficult to close the chute. For this reason, even when, for example, high-fluidity concrete is cast, concrete having properties as designed can be cast in a wide range and quickly. In addition, noise is reduced because no pressure pump is used. Accordingly, the construction period required for placing concrete can be shortened, so that construction can be performed more economically.

According to the second aspect of the present invention, concrete can be cast over a wider area.

According to the third aspect of the present invention, since the concrete pouring point can be changed without moving the position of the concrete container, the concrete pouring range can be more easily expanded.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a concrete placing mechanism 1 according to an embodiment of the present invention.

FIG. 2 is a schematic bottom view illustrating a configuration of a driving chute 4 which is a component of the concrete placing mechanism 1.

FIG. 3 is a schematic diagram illustrating a modified example of a driving chute 3 which is a component of the concrete placing mechanism 1.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Concrete pouring mechanism 2 Concrete container 3, 4 Driving chute (chute) 31 Rotary shaft 32 Partition 33 Motor (power source) 34 Power transmission mechanism

Claims (3)

[Claims] 1. A rotating shaft having a partition spirally wound therearound and fixed thereto is rotatably mounted inside a chute, and further, using this chute, concrete is conveyed obliquely downward and cast. A concrete casting method characterized by the following. 2. The concrete casting method according to claim 1, wherein the chute is branched into a plurality at the tip end side and concrete is poured into a plurality of places at the same time. 3. The concrete casting method according to claim 1, wherein the concrete container holding the concrete conveyed by the chute is rotatable.