JPH04360963A - Placing method for celluler concrete in site - Google Patents

Abstract

PURPOSE:To improve workability by feeding a fixed quantity of mortar with additional water, to a continuous mixer, after the mortar is accepted into an agitating hopper from an agitator truck, and by applying following bubbles produced by a preforming method. CONSTITUTION:The dry mortar of a slump equal to or less than 18cm is accepted into an agitator hopper 2 with a non-pulsating fixed quantity discharging device as a fixed quantity feeder 3 from an agitator truck 1. After that, the fixed quantity of the mortar is fed to a continuous mixer 4 and at the same time, the fixed quantity of water is added to the mixer 4 from a water tank 5 by a pump 6, and the soft degree of the mortar is set as a slump equal to or greater than 25cm. After that, bubbles produced by a preforming method are added to the mixer 4 from a bubble tank 7, and the mortar is pressure-fed by a squeezing pump 8 and is placed in site.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for placing aerated concrete on-site.

0002

[Prior Art] Conventionally, the commonly used on-site pouring method for aerated concrete involves loading approximately half the amount of mortar on an agitator truck, and adding the equivalent of half of the amount of air bubbles produced by the preforming method to this mortar. Method of mixing by rotation and force-feeding with a squeeze pump car
No. 8505), or by pumping up the mortar alone and placing an airtight mixer (static mixer, etc.) in the middle of the pressure-feeding piping, injecting air bubbles using the preforming method and mixing to form aerated concrete. A method of force-feeding and pouring (Japanese Unexamined Patent Publication No. 1-105868) is known.

0003

[Problems to be Solved by the Invention] However, in such conventional pouring methods, the former method has insufficient transport efficiency because only half the amount of mortar is loaded, and the foam remaining in the agitator truck is There is a risk that the agent may enter ordinary concrete through the recovered water. In addition, the latter method has problems such as the airtight mixer increasing piping resistance and significantly reducing pumping capacity.

[0004] In general, it is often difficult to manufacture cellular mortar at an on-site plant in a confined space, and the use of mortar made at a ready-mixed concrete factory is advantageous in that the on-site plant can be greatly simplified. be. In addition, since cellular mortar is generally required to have high fluidity, the mortar used has a water-cement ratio of 50% or more and a slump of 25%.
cm or more, which is difficult to pass through with ordinary raw concrete mixers, low-airtight discharge hoppers, etc., and there are many problems such as overflowing on slopes during transportation.

[0005] Furthermore, in order to mix mortar and foam at a predetermined ratio on-site, it is necessary to supply both mortar and foam in fixed quantities. This quantitative supply of bubbles is carried out using foaming liquid, dilution water,
Air is supplied through a flow meter.

[0006] On the other hand, mortar has hitherto been supplied in a constant quantity by controlling the rotation speed using a squeeze pump or the like, but fluctuations due to pulsation are unavoidable, which is unfavorable in terms of quality.

Therefore, an object of the present invention is to solve such conventional problems, and in the manufacturing process of cellular mortar, a hardness with a slump of 18 cm or less is required during the manufacturing process of mortar, transportation, acceptance to on-site plant, and quantitative supply. Kneaded,
Just before adding air bubbles, add water to slump the softness to 25c.
It is an object of the present invention to provide an on-site pouring method for aerated concrete that has excellent workability and is extremely economical by adjusting the diameter to a value greater than m.

[0008]

[Means for Solving the Problems] In order to achieve the above-mentioned object, according to the present invention, an on-site pouring method for aerated concrete includes a method for pouring mortar with a slump of 18 cm or less from an agitator truck with a non-pulsating quantitative discharge device. After receiving the material into the agitate hopper, it is fed in a constant quantity to a continuous mixer, and first, water is added to adjust the softness to make the slump 25 cm or more, and then air bubbles made by the preforming method are added to obtain a predetermined amount of air. It is characterized by

Other objects, features and advantages of the invention will become apparent from the following detailed description, taken in conjunction with the accompanying drawings, which schematically illustrate the in-situ casting method of aerated concrete according to the invention.

0010

[Example] Fig. 1 of the drawings shows an example of implementing the method for placing aerated concrete on-site according to the present invention. In the mortar manufacturing process, from mortar production, transportation, on-site plant acceptance, and quantitative supply, hard kneaded mortar with a slump of 18 cm or less is transferred from an agitator truck 1 to an agitator with a non-pulsation quantitative discharge device as a quantitative supply device 3. After receiving the mortar into the hopper 2, the mortar is quantitatively supplied to the continuous mixer 4, and then, immediately before mixing air bubbles, water is added from the water tank 5 to the continuous mixer 4 using the metering pump 6 to adjust the softness of the mortar to a slump of 25 cm or more. However, by adding the bubbles created by the preforming method from the bubble tank 7 to the continuous mixer 4, and pumping them with a squeeze pump 8 to cast on-site, it is possible to create aerated concrete on-site with excellent workability and extremely low cost. This provides a new pouring method.

[0011] A valve screw conveyor or the like can be suitably used as the quantitative supply device 3 in the on-site pouring method for aerated concrete of the present invention. That is,
Hard-kneaded mortar has no problems when manufactured and shipped at a plant, and in particular, since a predetermined precision can be achieved only with hard-kneaded mortar when supplying a fixed amount on site, it is manufactured and shipped from plants such as ready-mixed concrete.

[0012] Furthermore, there is no problem in adding water for softness adjustment at the site because it is supplied from the water tank 5 by a metering pump 6 linked to the mortar metering supply device 3. Further, the continuous mixer 4 used here is preferably a horizontal twin-shaft mixer so that low-density bubbles and high-density mortar can be sufficiently mixed.

Furthermore, since the foam mortar is pumped directly from the continuous mixer 4 by the squeeze pump 8 after it becomes highly fluid, there is no need to consider piping troubles, and piping cleaning can also be done during operation. This has the advantage that it can be carried out by flowing a sponge into the piping.

[0014] Actual examples of the on-site pouring method for aerated concrete of the present invention include a conventional on-site plant method in which cement and sand supply equipment, a foaming device, and a mixing device are installed at the construction site, and a hard-mixed mortar method from a ready-mixed concrete factory. The table below compares the mixer truck mixing method, which uses a foaming device and a mixing device, in which water is added on-site by purchasing a foaming device.

On-site plant method Mixer truck mixing method Mole used in this invention Cement (kg/m3) 585
585 642 Tal blended sand (〃) 1170
1170 128
5 water (〃)
353 353
287 Mortar softness used (cm)
25 25
16 (slump) Air bubble mortar characteristic flow value (cm) 19±3
19±4 1
9±2 specific gravity 1.0
±0.6 1.0±0.8
1.0±0.3 compressive strength (kgf/cm2)
12±4 12±5
12±2 construction capacity (m3/day)
70 40
150

[0016]

[Effects of the Invention] As described above, according to the on-site pouring method for aerated concrete of the present invention, the slump can be reduced to 18 cm in the process of producing aerated mortar, from mortar production, transportation, on-site plant acceptance, and quantitative supply. Since the following hard-kneaded mortar is used, there is no need to take any special measures to obtain the mortar from the ready-mixed concrete, so a large amount of mortar can be supplied. Using a continuous mixer and squeeze pump, slump the mortar by adding water.
Since the foam is adjusted to 5 cm or more, mixed with air bubbles, and then poured and poured on-site, the on-site plant can be simplified to about half that of conventional plants, and the on-site casting of aerated concrete can be extremely economical and simple. Effects such as excellent workability can be obtained.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram illustrating the implementation state of the on-site pouring method for aerated concrete according to the present invention.

[Explanation of symbols]

1 Agitator track 2 Agitator hopper 3　　　　Quantity supply device 4 Continuous mixer 5 Water tank 6 Metering pump 7 Bubble tank 8 Squeeze pump

Claims (1)

[Claims] Claim 1: Mortar with a slump of 18 cm or less is received from an agitator truck into an agitate hopper equipped with a non-pulsating metering discharge device, and then fed in a constant quantity to a continuous mixer. A method for placing aerated concrete on-site, characterized by adding water and then adding air bubbles made by a preforming method to obtain a predetermined air content.