JPS62197567A - Method for casting solid granular concrete/mortar - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a method for placing solid particulate concrete mortar into formwork.

(b) The prior art applicant disclosed in Japanese Patent Application Laid-open No. 60-218100 that cement and aggregate were mixed in air in a sub-zero atmosphere, and at that time, micronized ice was poured into the cement. Kneading in the air,
The dry cement is similarly put into a formwork in a sub-zero atmosphere, compressed and formed, and then heated to melt the ice mixed into the cement. We are proposing a method of solidifying cement by causing it to react.

(C)0 Problems that the invention attempts to solve In this method,
It is now possible to solidify cement with water at a level equivalent to its theoretical hydration amount, making it possible to manufacture concrete and mortar components with high strength and durability. It is conceivable that the reinforcing bars, etc., present in the formwork may interfere with the compaction work and prevent it from being carried out properly.

Additionally, in addition to the method of mixing water in the form of ice into cement to obtain concrete/mortar components, there is also a method of mixing water in the form of microcapsules into cement. Recently, there are methods to coagulate water with a permanent hydration amount, and further methods to mix water into cement in the form of particulate water-absorbing polymer and coagulate the cement with water in a theoretical hydration amount. This is a common problem when using the various cement mixing and placing methods that have been studied.

In view of the above-mentioned circumstances, the present invention has developed a solid particulate material that can compress (compact) water and cement put into a formwork without being hindered by the presence of reinforcing bars in the formwork. Its purpose is to provide a method for placing concrete and mortar.

(d) Means for solving the zero problem, that is, the present invention provides a suction means (1b15) in the formwork (1), and when pouring solid particulate concrete mortar (6), the suction means ( lb, 5) to compact the solid particulate concrete mortar (6) introduced into the formwork (1).

Note that the numbers in parentheses are for convenience and indicate corresponding elements in the drawings, and therefore, this description is not limited to the descriptions on the drawings. The following r (el
The same applies to the column ``, action''.

(e) 0 effect With the above-described configuration, the present invention provides a structure in which the solid particulate concrete mortar (6) charged into the formwork (1) is sucked by the suction means (lb, 5). (1
) so that it is densely compressed and packed.

(f), Example Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a front view showing an example of a column formwork to which the method for placing solid particulate concrete and mortar according to the present invention is applied.

As shown in FIG. 1, the column formwork 1 is erected on a floor 2, and the column formwork 1 has a formwork material 1a having a planar closed cross-sectional shape. Therefore, a columnar concrete casting space 3 is formed by the floor 2 and the formwork 1a in the vertical direction in the figure.

On the left side of the formwork material 1a in the figure, there are suction holes 1 in the vertical direction in the figure.
A plurality of holes b are drilled through the suction hole 1b, and a filter 1c is installed on the concrete placement space 3 side of the suction hole 1b.

Note that a vacuum pump 5 is connected to each suction hole 1b.

In addition, reinforcing bars are installed inside the column formwork 1, but the first
In the figures, illustration thereof is omitted to simplify the explanation.

Since the column formwork 1 has the above configuration, the column formwork 1
When placing solid particulate concrete/mortar 6 in concrete placing space 3 formed by
The vacuum pump 5 is driven to suck air in the concrete placement space 3 through each suction hole 1b.

In addition, "solid particulate concrete mortar" as used herein refers to concrete mortar in which water is mixed into cement in the form of ice, and concrete mortar in which water is mixed into cement in the form of microcapsules. Concrete
Concrete in which water is mixed in mortar and cement in the form of water absorbed by fine particles of water-absorbing polymer.
Concrete mortar, such as mortar, that maintains a solid particle state when poured into the formwork 1.

In this state, solid particulate concrete mortar 6 is poured into the concrete placement space 3 from above in the figure. Then, the solid particulate concrete mortar 6
The concrete 1 and the pouring space 3 are compacted by the suction force acting from each suction hole 1b, which compacts the cement and aggregate that make up the solid particulate concrete mortar 6.
is densely compressed and packed. Each suction hole 1b has a filter I.
C, the solid particulate concrete/mortar 6 will not be sucked into the vacuum pump 5 side.

Below, a case where water is mixed with cement in the form of fine ice particles will be explained in more detail. That is,
First, aggregate such as sand is added to cement in a dry state and dry mixing is performed. The purpose of this dry mixing is to mix cement and aggregate evenly, and during this dry mixing, ice in the form of fine particles is simultaneously added to the cement and mixed. This operation is carried out in sub-zero conditions, so that the ice mixed with the cement is mixed as a solid with the cement and other aggregates, resulting in a solid particulate concrete mortar. The particle size of ice is preferably similar to that of cement, and ice with this particle size is produced by applying ultrasonic vibrations to liquid water to atomize it, and then instantaneously cooling the atomized water. do.

In this way, when the dry kneading of the fine particle ice, cement, and aggregate at below freezing temperatures is completed, the dried cement that has been dry mixed is similarly placed in the formwork 1 with reinforcing bars in the below freezing atmosphere. The material is then compacted using a vacuum pump, etc., as described above.

In this way, when the solid particulate concrete mortar is heated either forcibly or naturally, the ice in the compacted cement melts and turns into water, which causes a hydration reaction with the surrounding cement and solidifies and hardens. . Since the ice in the cement is thoroughly and uniformly mixed with the cement by dry mixing, the cement is sufficiently hydrated and solidified with water at a theoretical hydration amount.

Next, a case will be described in which water is mixed into cement in a state where water is absorbed by a particulate water-absorbing polymer.

First, aggregate such as sand is added to cement in a dry state and dry mixing is performed. The purpose of this dry mixing is to mix cement and aggregate evenly, but during this dry mixing, water is impregnated into a water-absorbing polymer (for example, acrylic acid resin) in a fine powder state. Pour into cement and mix. The water impregnated into the water-absorbing polymer does not suddenly release the water to the outside, but gradually releases the water to the outside during the dry kneading operation and the subsequent time of pouring. During dry kneading, the solid state with cement adsorbed around the polymer is maintained, and the aggregate, cement, and water-absorbing polymer are kneaded while maintaining the state of a solid mixture as a whole. The particle size of the water-absorbing polymer is preferably the same as that of cement in a water-absorbing state in order to obtain a uniform mixture with cement.

After the water Ie impregnated with the cement, aggregate, and finely powdered water-absorbing polymer is mixed, the mixed cement is transported to the casting site using an appropriate transport means. The cement emptying site and the cement pouring site do not necessarily have to be close to each other; if they are far apart, a dump truck or the like is used to transport them. As mentioned above, concrete in the mixed state maintains a solid mixture state as a whole, so when transporting it, it is sufficient to use a normal transport vehicle without using a special vehicle such as a concrete mixer truck. be.

When the mixed concrete is transported to the pouring site, the formwork 1 into which the concrete is to be poured is placed.
Insert it into the container and compact it according to the procedure already explained. At this time, the concrete as a whole remains in a solid mixture state (particle state) (however, due to water gradually seeping out from the water-absorbing polymer, the size of the cement core around the water-absorbing polymer gradually decreases). Therefore, the concrete is smoothly poured into the formwork and compacted by the vacuum pump 5 or the like.

Even after the concrete 1 is poured into the formwork 1, water continues to flow from the water-absorbing polymer to the surrounding cement (or water is absorbed into the polymer from the surrounding cement), and the surrounding unreacted water continues. A hydration reaction occurs between the existing cement and the water that has flowed out, and after a predetermined period of time, the hydration reaction between all of the cement that has been put in and the water that has flowed out is completed, and the concrete solidifies.

Since the water-absorbing polymer is uniformly distributed in the cement by kneading, all the water flows out from the water-absorbing polymer, so that the cement in the formwork 1 hardens in a uniform state. Note that after the water has drained out, the water-absorbing polymer remains in the solidified concrete and acts as an aggregate to reinforce the concrete.

In the above embodiment, the case where the formwork in which the solid granular concrete mortar 6 is cast is the column formwork 1 is explained, but the formwork in which the solid granular concrete mortar 6 is cast is the column formwork 1. Of course, it is not limited to the formwork 1, but may be a beam formwork or other formworks.

(g) 0 Effects of the Invention As explained above, according to the present invention, suction means such as the vacuum pump 5 and the suction hole 1b are provided in the formwork such as the column formwork 1,
When placing solid particulate concrete mortar 6,
By driving the suction means, the solid particulate concrete/mortar 6 put into the formwork is compacted, so that the solid particulate concrete/mortar 6 is compacted by the presence of reinforcing bars in the formwork. Regardless of the size, it can be compressed and filled into the mold without any gaps.

[Brief explanation of drawings]

FIG. 1 is a front view showing an example of a column formwork to which the method for placing solid particulate concrete mortar according to the present invention is applied. 1... Formwork (column formwork) 1b... Suction means (suction hole) 5... Suction means (vacuum pump) 6...
Solid particulate concrete/mortar Applicant Mitsui Construction Co., Ltd. Agent Patent attorney Phase 1) Shinji (and 1 other person)

Claims (1)

[Claims] A suction means is provided in the formwork, and when placing the solid particulate concrete/mortar, the suction means is driven to compact the solid particulate concrete/mortar put into the formwork. Method for placing solid particulate concrete/mortar constructed as described above