JP2000037720A - Method for handling concrete material and concrete construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate time restriction from the manufacture of a ready mixed concrete to the construction of the concrete, and make the handling of concrete materials easy by storing a mixture of cement and coarse aggregates and/or fine aggregates into a container and transporting the container to a concrete application site. SOLUTION: The respectively required quantities of cement, aggregates and, if necessary, an admixture material are added and mixed and the obtained mixture (concrete materials) is stored in a transportable container in a waterless addition state. Further the container is transported to a concrete construction site by truck, trailer, freight car or the like. In addition, the mixture is stored in a storage tank. Thus it is possible to perform the concrete construction work without a distance (a time) handicap between the manufacture of a ready mixed concrete to a concrete construction site. Further the mixture thus transported can be very easily applied even at an elevated site for concrete application by air-feeding the concrete to a specified spot at the 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 handling concrete material and a method for applying concrete, and more particularly, to a method for handling concrete material which is not subject to time constraints from the production of ready-mixed concrete to the construction of concrete and which is easy to handle. Also, the present invention relates to a concrete construction method having excellent workability.

[0002]

2. Description of the Related Art Conventionally, when concrete is constructed, ready-mixed concrete is used. The ready-mixed concrete is kneaded with cement, aggregate, water and admixture materials such as a water reducing agent that is added as needed in the ready-mixed concrete production facility, and put into a mixer truck.
After being transported to the construction site while kneading with a mixer truck, it is injected into the construction site by pumping.

On the other hand, concrete is roughly classified into ordinary concrete using natural gravel and sand as aggregate, and lightweight concrete using lightweight aggregate as aggregate. In the case of concrete construction, there are restrictions on construction based on the properties of concrete for both ordinary concrete and lightweight concrete.In the case of lightweight concrete, both the properties of concrete and the properties of lightweight aggregate used for lightweight concrete are considered. There was a restriction on construction based on. [Construction restrictions based on the properties of concrete (ordinary concrete, lightweight concrete):] (1): Distance (time) restrictions between the ready-mixed concrete production equipment and the concrete construction site; Approximately 70% is used as ready-mixed concrete [: ready-mixed concrete (unsolidified concrete)] manufactured in concrete manufacturing equipment. When using ready-mixed concrete, JIS A is used to prevent consolidation before concrete construction. By 5308, raw materials (cement, gravel,
It is stipulated that after mixing sand and water, the agitator truck (: mixer truck) can be unloaded to the concrete construction site within 1.5 hours and the dump truck within 1 hour.

[0004] For this reason, there is a distance (time) restriction between the ready-mixed concrete production facility and the concrete construction site, and when the mixer truck is caught in traffic congestion, the loaded ready-mixed concrete must be discarded. In some cases it was not. (2): Problems when the concrete construction site is at a high place; currently, the ready-mixed concrete is received and then pumped to the concrete construction site, but when the construction site is at a high place, high pressure and high output Pumps are required, and accordingly, a lot of energy such as electric power is required.

[0005] Because of the above-described restrictions on construction based on the characteristics of concrete, there is no time restriction from the production of ready-mixed concrete to concrete construction, and a method of handling concrete material that is easy to handle and concrete construction with excellent workability. A way was sought. [Constraints on construction based on the characteristics of lightweight aggregate (lightweight concrete):] Lightweight concrete achieves weight reduction of concrete structures and has a large number of air bubbles inside particles of lightweight aggregate used as aggregate. It excels in heat insulation and contributes to energy saving.

The above-mentioned lightweight concrete is mainly constructed using both artificial lightweight aggregate and cement having a small specific gravity, which are produced mainly from expansive shale, and concrete for various constructions such as floors and walls of buildings, and roadbeds. It is used as concrete for various types of civil engineering, such as materials or lightweight backing materials that cover the soil bearing capacity. FIG. 8 shows an example of a process for producing an artificial lightweight aggregate using expansive shale as a raw material.

The rough (expandable shale) is first coarsely ground and sieved to have a shale having a particle size of 15 to 5 mm (coarse), a shale with a particle size of 5 to 3 mm (medium shale), and A shale (: fine stone) having a particle size of 3 mm or less is obtained. Next, the obtained coarse crushed stone, medium crushed stone, and fine crushed stone are each fired and sieved to obtain coarse aggregate (particle size: 20 to 5 mm, specific gravity of absolute dryness: 1.29 ± 0.0).
5) Fine aggregate (fine aggregate A; particle size: 5 to 3 mm, specific gravity of absolute dryness:
1.45 ± 0.05, fine aggregate B; particle size: -3mm, specific gravity: 1.65
± 0.05).

[0008] Coarse aggregate is used as a natural gravel, and fine aggregate is used as a concrete material corresponding to natural sand. Lightweight concrete using the above-mentioned artificial lightweight aggregate is 20-30% lighter than ordinary concrete, and has the same performance as ordinary concrete. The artificial lightweight aggregate described above is handled in the same manner as ordinary concrete using natural gravel and sand, and is used for concrete construction.

FIG. 7 shows a conventional method of handling concrete material using artificial lightweight aggregate and a method of applying concrete. That is, for example, the artificial lightweight aggregate manufactured by the method of FIG. 8 absorbs 28% of its own weight of water under the conditions of high temperature and high pressure immediately after the manufacture of the artificial lightweight aggregate (for the reason described below): After pre-soaking, the mixture is transported and mixed with various admixtures such as cement, water, and, if necessary, a water reducing agent in a concrete manufacturing facility to produce a so-called ready-mixed concrete.

[0010] The manufactured ready-mixed concrete is transported to a concrete construction site, where it is pumped to a construction site by pumping and supplied to concrete. On the other hand, when the above-mentioned lightweight concrete was constructed, there were restrictions on the construction based on the characteristics of the lightweight aggregate.

In the above-mentioned lightweight aggregate such as artificial lightweight aggregate, coarse aggregate (particle size: 20 to 5 mm, specific gravity of absolute dryness: less than 2.0)
(Corresponding to gravel) 24-hour water absorption is about 10%, fine aggregate (particle size: -5mm, specific gravity less than 2.3) (corresponding to sand)
Has a water absorption of about 15% for 24 hours. This is because bubbles existing inside the aggregate are continuous and easily absorb water.

[0012] Due to the above-mentioned characteristics of the lightweight aggregate, the ready-mixed concrete obtained by mixing the lightweight aggregate, the cement and the water absorbs water in the bubbles of the light-weight aggregate, lowers the fluidity of the ready-mixed concrete, and increases the pressure of the high-pressure pump. Pumping is required. Therefore, when constructing lightweight concrete, pumping is performed by using ready-mixed concrete in which lightweight aggregate, cement, and water, which have been sufficiently absorbed by the pre-soaking, are used.

However, pre-soaking of lightweight aggregates such as artificial lightweight aggregates requires a process of absorbing water under high pressure and high temperature conditions, and pre-soaking is carried out by taking advantage of the lightweight properties of lightweight aggregates. In addition, there has been a demand for a method of handling a concrete material capable of using ready-mixed concrete containing the aggregate and a method of applying concrete.

[0014]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems in the concrete construction using the ready-mixed concrete of the prior art, and is not subject to the time constraints from the production of the ready-mixed concrete to the concrete construction, and is easy to handle. It is another object of the present invention to provide a concrete material handling method that does not hinder pumping at a concrete construction site and a concrete construction method excellent in workability.

[0015]

According to a first aspect of the present invention, a concrete is characterized in that a mixture of cement and coarse aggregate and / or fine aggregate is stored in a container and the container is transported to a concrete construction site. How to handle materials. According to a second aspect of the present invention, a mixture of cement and coarse aggregate and / or fine aggregate is stored in a container, the container is transported to a concrete construction site, and the transported mixture is transferred to a predetermined location in the concrete construction site. This is a method for handling concrete materials characterized by being transported by air.

In the first and second aspects of the present invention, the mixture of the cement and the coarse and / or fine aggregate is preferably a mixture further containing an admixture material (first aspect). Invention and the first preferred embodiment of the second invention). Also, the first invention, the second invention,
In the first preferred embodiment of each of the first invention and the second invention, it is preferable that at least one of the coarse aggregate and the fine aggregate contains a lightweight aggregate (the first invention and the second invention).
Second preferred embodiment of each invention of the present invention).

Also, the first invention, the second invention,
In the first preferred embodiment of each of the first invention and the second invention, at least one of the coarse aggregate and the fine aggregate is made of an artificial lightweight obtained by firing a raw material containing expansive shale. It is more preferable to contain an aggregate (the first invention,
Third preferred embodiments of the second invention). In the first to third preferred embodiments of the first invention, the second invention, the first invention, and the second invention,
The above-mentioned mixture of cement and coarse aggregate and / or fine aggregate, or the mixture of cement and admixture material and coarse and / or fine aggregate is preferably a water-free mixture.

Further, the first invention, the second invention,
In the first preferred embodiment to the third preferred embodiment of the first invention and the second invention, respectively, the mixture of the cement and the coarse aggregate and / or the fine aggregate, or the cement and the admixture material and the coarse bone It is preferable that the moisture of the mixture with the aggregate and / or the fine aggregate is 1% by weight or less. The third invention is
At a concrete construction site, water is added to a mixture of cement and coarse aggregate and / or fine aggregate, and the mixture after the addition of water is pumped to a concrete construction site to be used for concrete construction. Construction method.

According to a fourth aspect of the present invention, in a concrete construction site, a mixture of cement and coarse aggregate and / or fine aggregate is transported by air to a predetermined location, water is added to the predetermined location, and the water after the addition of water is added. A concrete construction method characterized by pumping a mixture to a concrete construction site and using the mixture for concrete construction. The fifth invention is
Storing a mixture of cement and coarse aggregate and / or fine aggregate in a container, transporting the container to a concrete construction site, adding water to the transported mixture, pumping to a concrete construction site, This is a concrete construction method characterized by being used for concrete construction.

[0020] A sixth invention is a cement and coarse aggregate and / or
Or the mixture with fine aggregate is stored in a container, the container is transported to a concrete construction site, and the transported mixture is pneumatically transported to a predetermined location in the concrete construction site,
A concrete construction method comprising adding water at the predetermined location, pumping the mixture after water addition to a concrete construction location, and using the mixture for concrete construction.

In the third to sixth aspects of the present invention, it is preferable that the mixture of the cement and the coarse and / or fine aggregate is a mixture further containing an admixture material (third aspect). First preferred embodiment of each of the invention to the sixth invention). Further, the third to sixth inventions described above,
In the first preferred embodiment of each of the third invention to the sixth invention, at least one of the coarse aggregate and the fine aggregate preferably contains a lightweight aggregate (the third invention to the sixth invention).
Second preferred embodiment of each invention of the present invention).

Further, the third to sixth inventions described above,
In the first preferred embodiment of each of the third invention to the sixth invention, at least one of the coarse aggregate and the fine aggregate is made of an artificial lightweight obtained by firing a raw material containing expansive shale. It is preferable to include an aggregate (third invention to sixth invention).
Third Preferred Embodiment of the Inventions). In the first to third preferred embodiments of the third to sixth inventions and the third to sixth inventions, the cement and the coarse aggregate and / or the fine aggregate are used. It is preferable that the mixture with the aggregate or the mixture of the cement, the admixture, the coarse aggregate and / or the fine aggregate is a water-free mixture.

Further, the third to sixth inventions described above,
In the first preferred embodiment to the third preferred embodiment of the third invention to the sixth invention, respectively, a mixture of the cement and the coarse aggregate and / or the fine aggregate before the addition of water, or before the addition of water. The above cement and admixture with coarse aggregate and / or
Alternatively, the water content of the mixture with the fine aggregate is preferably 1.0 wt% or less.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail. The present inventors have conducted intensive studies in order to solve the above-mentioned problems of the prior art, and as a result, have found the following findings (1) to (6), and have reached the present invention. (1): Transportation of concrete material without water; changing the concept from the conventional one, adding cement and aggregate, and if necessary, further admixture materials, and mixing, and the resulting mixture (hereinafter concrete) (Also referred to as a material) in a transport container without adding water, transporting the transport container to a storage tank disposed at a concrete construction site or the like, and storing the mixture in the storage tank, thereby obtaining the above-described conventional technology. Concrete construction can be performed without being restricted by the distance (time) restriction between the ready-mixed concrete production facility and the concrete construction site, which is a problem.

(2) Pneumatic transportation of concrete material: Cement and aggregate, and if necessary, further admixture materials are added, and the mixed mixture is pneumatically transported to a predetermined location of a concrete construction site without adding water. Accordingly, even when the concrete construction site is at a high place, construction becomes extremely easy. (3): Water addition and pumping to concrete material at the concrete construction site; By adding water to the concrete material at the concrete construction site, fluidity of ready-mixed concrete is ensured, workability is improved, and pumping is performed. Becomes easier.

(4): Selection of an appropriate water addition place in the concrete construction site; a mixture of the aggregate, cement and the admixture is transported to a predetermined place in the concrete construction site by pneumatic transportation or the like, and the predetermined place is selected. For the first time, water is added, mixed, and pumped to the concrete construction site, shortening the pumping distance, requiring only a small pump for pumping, and the power required for pumping. The required energy can be reduced.

(5): Purification of the construction site by limiting the place where the ready-mixed concrete is handled; According to the above-described method for handling the concrete material, the handling place of the ready-mixed concrete to which water is added is limited to the concrete work place. Is possible,
The construction site can be kept clean without the ready-mixed concrete being scattered throughout the construction site. (6): Utilization of characteristics of lightweight aggregate;: Suppression of segregation of each component of concrete material due to use of lightweight aggregate; lightweight aggregate is lighter in gravity than natural gravel and sand; The specific gravity of the coarse aggregate of the corresponding lightweight aggregate is less than 2.0 compared to 2.5 for the natural gravel, and the specific gravity of the fine aggregate of the lightweight aggregate corresponding to natural sand. Is lighter than natural sand with a specific gravity of 2.6 but less than 2.3.

Further, as described above, the absolute specific gravity of the coarse aggregate and the fine aggregate of the artificial lightweight aggregate obtained by calcining the raw material containing the expansive shale is, for example, 1.29, respectively, as described above.
(Coarse aggregate), 1.45 to 1.65 (fine aggregate), extremely lightweight. For this reason, by using a lightweight aggregate as the aggregate, more preferably the above-mentioned artificial lightweight aggregate, a mixture (blend) of the aggregate, the cement and the admixture material can be handled without segregation of each component. Can be transported.

That is, by using a lightweight aggregate as an aggregate, a predetermined amount of each of the aggregate, the cement and the admixture is blended and mixed, and the concrete material is stored in a transport container in a water-free state. Even when transported to the construction site and water is added for the first time at the construction site, uniform ready-mixed concrete can be obtained. As a result, concrete construction can be performed without being restricted by the distance (time) between the ready-mixed concrete production facility and the concrete construction site, which is a problem of the above-described conventional technology.

Excellent compatibility of lightweight aggregate with pneumatic transportation; lightweight aggregate is very suitable for pneumatic transportation due to its low specific gravity, and easily pneumatically transports a mixture of lightweight aggregate with cement and admixture. can do. As a result, the mixture of the lightweight aggregate, the cement, and the admixture material is received in a storage tank disposed at the concrete construction site in a water-free state, and is transported from the storage tank to the concrete construction site by pneumatic transportation. Even when the concrete construction site is at a high place, construction becomes extremely easy.

In the present invention, in a concrete production facility (hereinafter also referred to as a dry concrete production facility), a predetermined amount of each of cement, aggregate and, if necessary, admixture materials are blended and mixed. As aggregate, depending on the application,
Both coarse aggregate and fine aggregate may be used, or only fine aggregate or coarse aggregate may be used.

It is more preferable that at least one of the coarse aggregate and the fine aggregate contains a lightweight aggregate. In this case, a part of the coarse aggregate and the fine aggregate may be made into a lightweight aggregate,
All may be made of lightweight aggregate. As a lightweight aggregate,
Artificial lightweight aggregate (JIS A 5002), natural lightweight aggregate (JIS A 50
02) may be used.

Next, a mixture of cement and aggregate produced by the dry concrete production facility and an admixture added as necessary (concrete material) is stored in a container, and the container is transported to a concrete construction site. Then, the concrete material is stored in a storage tank installed at the concrete construction site, or the container is used as a storage tank. Storage tanks and containers will be equipped with concrete material discharge devices.

Further, to the pipe connected to the concrete material discharging apparatus, a water adding apparatus, a pressure pump for fresh concrete and a pressure pipe for fresh concrete are connected in this order. The water addition device adds the required amount of water to the concrete material,
It has a mixing device that stirs and mixes concrete material and water. At the time of concrete construction, a substantially constant amount of concrete material is continuously discharged from the storage tank or the container per unit time, and a predetermined amount of water is continuously poured into the material by a water addition device, and then stirred and mixed. Then, the obtained ready-mixed concrete is pumped to the concrete construction site by a pump and injected.

According to the present invention, water is added for the first time at a concrete construction site to a mixture of cement, aggregate, and an admixture material added as needed (concrete material), so that ready-mixed concrete is not coagulated. There is no fluidity and no decrease in fluidity, so even if the concrete construction site is far away from the concrete manufacturing equipment, the concrete construction can be performed without any trouble.

Further, when a part or the whole of the aggregate is made of a lightweight aggregate, the ready-mixed concrete can be injected into the concrete injection site while the lightweight aggregate does not absorb water. It does not occur and lightweight aggregate can be used easily. In the present invention, it is preferable that the concrete material is pneumatically transported to a predetermined location in the concrete construction site.

That is, in another embodiment of the present invention, a pneumatic transport device is attached to a storage tank or a container to be transported installed at a concrete construction site, and a storage tank and a water addition device are installed at or near the concrete construction site. Install. The pneumatic transportation device, the storage tank and the water addition device are connected by a pipe, and a concrete injection pipe and a fresh concrete pressure pump are connected to the outlet of the water addition device.

Further, the storage tank is provided with a discharge device for continuously discharging the concrete material. At the time of concrete construction, the concrete material is pneumatically transported from the storage tank or the transported container to the storage tank, a substantially constant amount of concrete material is continuously discharged from the storage tank, and a predetermined amount of the concrete material is continuously discharged by the water addition device. Water is injected, stirred and mixed, and the obtained ready-mixed concrete is poured into a concrete construction site using a filling pipe and a ready-mixed concrete pump.

When the concrete construction site is at a high place,
For example, the present invention is particularly suitable for the construction of a high floor of a high-rise building. That is, the storage tank or the transported container for storing the concrete material (mixture) transported from the dry concrete manufacturing facility is installed on the ground, and the storage for storing the concrete material pneumatically transported from the storage tank or the container. If the tank and the water addition device are installed at a high place, pneumatic transportation can be performed because water is not added when the concrete material of the storage tank or the container is fed to the storage tank, and a high-output pump is not required. .

In the present invention, even if the storage tank or the transported container is not installed at a high place, the storage tank or the transported container on the ground and the water addition device provided at the high place can be connected via the air transport device. May be directly connected. In this case, the concrete material continuously discharged from the storage tank or the transported container in a substantially constant amount per unit time is pneumatically transported, fed to a water addition device, and water is added, stirred and mixed by the water addition device. Then, the concrete is injected into the concrete construction site by pumping.

In the present invention, the following cement, aggregate,
Admixture materials are preferably used. [Cement:] As the cement, it is possible to use one or more selected from Portland cement such as ordinary Portland cement, Portland cement with high strength, ultra-high strength Portland cement, blast furnace cement, fly ash cement, silica cement and the like. it can. [Aggregate:] (Natural aggregate :) Gravel (coarse aggregate) and sand (fine aggregate) are used as natural aggregate. (Lightweight Aggregate) As the lightweight aggregate, one or more selected from an artificial lightweight aggregate, a natural lightweight aggregate, and a by-product lightweight aggregate can be used.

As a lightweight aggregate, the absolute dry specific gravity is 2.0
It is preferred to use less than coarse aggregate and / or fine aggregate having a bone-dry specific gravity of less than 2.3. In addition, as the above-mentioned coarse aggregate, the size of the aggregate specified in JIS A 5002-1994: 20 to
It is preferable to use coarse aggregates of 5 mm and 15 to 5 mm, and as fine aggregates, the mass percentage passing through 4760 μm of a standard sieve (JIS Z 8801) 4760 μm specified in JIS A 5002-1994 is 90 to 100.
It is preferred to use 0% fine aggregate.

That is, the concrete in the present invention includes mortar containing no coarse aggregate. Examples of the artificial lightweight aggregate include an aggregate obtained by firing a material containing one or more selected from expandable shale, expanded clay, and expanded slate, and fired fly ash.

In the present invention, as an artificial lightweight aggregate,
It is more preferable to use coarse aggregate and / or fine aggregate obtained by firing a raw material containing expansive shale. This is because coarse aggregates and / or fine aggregates obtained by calcining a raw material containing expansive shale have an extremely low absolute dry specific gravity as described above, and as a result, aggregates, cement and admixtures This is because segregation of each component in the mixture with the above can be prevented, and the effect of the present invention can be maximized.

Further, the artificial lightweight aggregate described above has an extremely small absolute dry specific gravity, and is therefore extremely suitable for pneumatic transportation. As a natural lightweight aggregate, volcanic rubble and its processed products can be used, and as a by-product lightweight aggregate,
By-product lightweight aggregates such as expanded slag and processed products thereof can be used.

In the present invention, it is also preferable to use a mixture of natural gravel and / or natural sand in addition to lightweight coarse aggregate and / or lightweight fine aggregate. [Admixture:] As the admixture, the following admixtures and / or admixtures are used. [Admixture (admixture material with small blending amount):] The admixture is selected from a fluidizing agent, a water reducing agent, a setting retarder, a curing accelerator, a coagulant, a thickener, an AE agent and a foaming agent. Species or two or more can be used.

[Admixture (admixture having a large amount of compound):] As the admixture, blast furnace slag, fly ash, expansive material,
One or more selected from silica fume and pozzolan can be used. Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1A shows an example of a concrete material handling method according to the first preferred embodiment of the first invention, the second invention, the first invention, and the second invention, and FIG. FIG. 7 shows an example of a concrete material handling method according to the second preferred embodiment and the third preferred embodiment of the first invention and the second invention using a flow sheet.

As shown in FIG. 1 (a), in the first invention, in a concrete production facility (a dry concrete production facility), a predetermined amount of cement and aggregate and, if necessary, admixture materials are added and blended. After mixing, the resulting mixture (: concrete material) is stored in a container, and the container is transported to a concrete construction site by a truck, a trailer, a freight car, or the like.

Further, as shown in FIG. 1 (a), in the second invention,
A mixture of cement, aggregate, and an admixture added as necessary (concrete material) is stored in a container,
The container is transported to a concrete construction site by truck, trailer, wagon, or the like, and the transported mixture is pneumatically transported to a predetermined location on the concrete construction site.

As the aggregate in the first and second aspects of the present invention, both coarse aggregate and fine aggregate or only fine aggregate or coarse aggregate is used depending on the application. You may. Further, a part or the whole of the coarse aggregate and / or the fine aggregate may be used as the lightweight aggregate.

As lightweight aggregates, artificial lightweight aggregates (JIS A
5002) or natural lightweight aggregate (JIS A 5002). In the first and second inventions described above, as shown in FIG. 1, the mixture in the container may be temporarily stored in a storage tank at a concrete construction site and used for concrete construction, or may be transported. When the container used in (1) is used as a storage tank and the concrete material becomes insufficient, the concrete material transported in another container may be used by replenishing the container.

Further, in the first and second aspects of the present invention, for example, a container containing a mixture of cement and an aggregate and an admixture material such as a water reducing agent that is added as necessary is contained in the container. It is preferable to use pneumatic transportation in a step such as discharge from the air. According to the first aspect of the present invention, concrete construction can be performed without being restricted by the distance (time) between the ready-mixed concrete production facility and the concrete construction site, which is a problem of the related art.

According to the second aspect of the present invention, the use of pneumatic transportation not only makes the construction extremely easy even when the concrete construction site is at a high place, but also transports the concrete material in a short time. Can be performed, and the construction period can be shortened. Further, FIG.
According to the second preferred embodiment (use of lightweight aggregate) and the third preferred embodiment (use of artificial lightweight aggregate) of the first invention and the second invention, respectively, shown in FIG. By utilizing the properties of the material, the following excellent effects can be obtained.

Suppression of segregation of each component of the concrete material due to use of the lightweight aggregate; Since the specific gravity of the lightweight aggregate is light, the concrete material is stored in a predetermined storage tank without causing segregation of each component in a state where water is not added. Can be transported to a predetermined location. : Excellent adaptability of lightweight aggregate to pneumatic transportation; lightweight aggregate is very suitable for pneumatic transportation due to its low specific gravity, and can easily pneumatically transport a mixture of lightweight aggregate, cement and admixture. it can.

Further, according to the present invention, it is possible to pump the ready-mixed concrete to the concrete work site before the absorption of water into the open cells of the lightweight aggregate progresses. And the need for pre-soaking of lightweight aggregates, which was conventionally required, is eliminated. Next, FIGS. 2 to 6 show the third to sixth inventions described above,
One example of the concrete construction method according to the first preferred embodiment to the third preferred embodiment of the third invention to the sixth invention is shown by a flow sheet.

In the third invention and the first preferred embodiment of the third invention shown in FIG. 2A, the first invention and the second invention
For the first time at the concrete construction site, water was added to the mixture of cement and aggregate, and the admixture material added as necessary, which is the concrete material transported to the concrete construction site in the invention of Pump the pump.

That is, a water addition device, a ready-mixed concrete pump, and a ready-mixed concrete feed pipe are connected in this order to the concrete material discharge port side of a concrete material storage tank or a transported container installed at the concrete construction site. The water addition device has a mixing device that adds a necessary amount of water to the concrete material and stirs and mixes the concrete material and water.

At the time of concrete work, a substantially constant amount of concrete material is continuously discharged from the storage tank or the container per unit time, and a predetermined amount of water is continuously poured into the material by a water adding device, and then the mixture is stirred. , Mixed, and the resulting ready-mixed concrete is pumped to a concrete construction site by a pump and injected. According to the third invention and the first preferred embodiment of the third invention, the following excellent effects can be obtained.

Elimination of the restriction on the distance (time) between the ready-mixed concrete production equipment and the concrete construction site; water is added for the first time at the concrete construction site, so that the ready-mixed concrete does not condense and the concrete construction site produces concrete. No matter how far away from the equipment, concrete construction can be performed without hindrance.

Improvement of workability: Since water is added for the first time at a concrete construction site, good fluidity of ready-mixed concrete is ensured, and workability is improved. : Shortening the construction period; improving the fluidity of the ready-mixed concrete facilitates pumping of the ready-mixed concrete, and also avoids the problem of pump failure and blockage of the pump and piping system during pumping, thus enabling quick construction. It can be carried out.

Elimination of restrictions on construction based on the characteristics of lightweight aggregates; when a part or all of the aggregates are made of lightweight aggregates, the place where the ready-mixed concrete is injected (injected) while the lightweight aggregates do not absorb water Therefore, the lightweight aggregate can be used easily without causing a failure of the pump and a blockage of the pump and the piping system during the pumping of the ready-mixed concrete.

As a result, presoaking of lightweight aggregates such as artificial lightweight aggregates becomes unnecessary. In the present invention,
Admixtures can also be added at the concrete construction site. In the fourth invention shown in FIG. 3 (a) and the first preferred embodiment of the fourth invention, in a concrete construction site, a mixture of cement, aggregate, and an admixture material added as necessary is used. Pneumatic transportation to the specified location of the concrete construction site, water is added for the first time at the specified location, and pumping is performed to the concrete construction site.

In the present invention, a pneumatic transportation device is attached to a storage tank or a container to be transported installed at the above-mentioned concrete construction site, and the transported concrete material is transported by air to a predetermined portion of the concrete construction site. In addition, a storage tank and a water addition device will be installed at or near the concrete construction site.

The pneumatic transportation device, the storage tank and the water addition device are connected by a pipe, and a concrete injection pipe is connected to the outlet of the water addition device. The storage tank is provided with a discharge device for continuously discharging the concrete material. At the time of concrete construction, the concrete material is pneumatically transported from the storage tank or the transported container to the storage tank, a substantially constant amount of concrete material is continuously discharged from the storage tank, and a predetermined amount of the concrete material is continuously discharged by the water addition device. Water is added, agitated and mixed, and ready-mixed concrete is poured into the concrete construction site with a filling pipe.

When the concrete construction site is at a high place,
For example, the present invention is particularly suitable for the construction of a high floor of a high-rise building. That is, the storage tank or the transported container for storing the concrete material (mixture) transported from the dry concrete manufacturing facility is installed on the ground, and the storage for storing the concrete material pneumatically transported from the storage tank or the container. If the tank and the water addition device are installed at a high place, pneumatic transportation can be performed because water is not added when the concrete material of the storage tank or the container is fed to the storage tank, and a high-output pump is not required. .

In the present invention, even if the storage tank or the transported container is not installed at a high place, the storage tank or the transported container on the ground and the water adding device provided at the high place can be connected via the air transport device. May be directly connected. In this case, the concrete material continuously discharged from the storage tank or the transported container in a substantially constant amount per unit time is pneumatically transported, fed to a water addition device, and water is added, stirred and mixed by the water addition device. Then, the concrete is injected into the concrete construction site by pumping.

According to the fourth invention and the first preferred embodiment of the fourth invention, the following effects can be obtained. : Elimination of distance (time) restriction between ready-mixed concrete production equipment and concrete construction site; water is added for the first time at concrete construction site, so that ready-mixed concrete does not set,
Even if the concrete construction site is far from the concrete manufacturing equipment, the concrete construction can be performed without any trouble.

Improvement of workability: Since water is added for the first time at a concrete construction site, good fluidity of ready-mixed concrete is ensured, and workability is improved. : Shortening the construction period; improving the fluidity of the ready-mixed concrete makes it easier to pump the pump, as well as performing quick construction without causing pump failure and blockage of the pump and piping system during pumping. Can be.

The speed of transportation of the ready-mixed concrete to the construction site is increased by the combined use of the pneumatic transportation and the pumping, so that the concrete can be quickly poured and the construction period can be shortened. : Miniaturization of pump during pumping and reduction of energy required for pumping; minimizing pumping distance by pneumatic transportation to minimize pumping distance
In addition, required energy such as electric power required for pumping can be reduced.

Improvement of concrete workability at high places;
Since water is not added to the concrete material, it can be transported by air. By adding water at a high place and pumping the concrete material to a concrete construction site, a high-output pump is not required. In the fifth invention, which is a more preferable concrete construction method of the present invention shown in FIG. 4 (a), and the concrete construction method of the first preferred embodiment of the fifth invention, cement and aggregate, and After further mixing the admixture materials accordingly, the resulting mixture is stored in a container, and the container is transported to a concrete construction site.

Next, after water is added to the transported mixture, the mixture is pumped to a concrete work site and used for concrete work. According to the fifth aspect and the first preferred aspect of the fifth aspect, the following effects can be obtained. : Elimination of the distance (time) restriction between the ready-mixed concrete production facility and the concrete construction site; the distance (time) restriction between the ready-mixed concrete production facility and the concrete construction site, which is a problem of the prior art described above. Concrete work can be performed without receiving it.

Improvement of workability: Water is added at the concrete construction site, so that the flowability of the ready-mixed concrete at the time of concrete construction is excellent, and the workability is improved. Furthermore, the above-mentioned improvement in fluidity facilitates pumping and pumping,
Rapid construction work can be performed without causing a failure of the pump during pumping and a problem of blockage of the pump and piping system.

Further, in the sixth invention and the first preferred embodiment of the sixth invention, which are more preferable concrete construction methods in the present invention shown in FIG. 5, cement and aggregate, and if necessary, After mixing the admixtures, the resulting mixture is stored in a container, and the container is transported to a concrete construction site. Next, the transported mixture is pneumatically transported to a predetermined location on the concrete construction site, water is added at the predetermined location, and the mixture after water addition is pumped to the concrete construction location and used for concrete construction.

In the present invention, as shown in FIG. 5 (b), a cement admixture such as a fluidizing agent may be added at the concrete construction site. According to the sixth aspect, the following excellent effects can be obtained. : Elimination of the distance (time) restriction between the ready-mixed concrete production facility and the concrete construction site; the distance (time) restriction between the ready-mixed concrete production facility and the concrete construction site, which is a problem of the prior art described above. Concrete work can be performed without receiving it.

Reduction of energy required for transporting water;
In contrast to the conventional method of transporting ready-mixed concrete from a concrete manufacturing facility, the energy required for transporting the water contained in the ready-mixed concrete is not required. : Improve workability; Water is added at the concrete construction site, so the fluidity of ready-mixed concrete during concrete construction is excellent,
Workability is improved.

Shortening the construction period; improving the fluidity of the ready-mixed concrete facilitates pumping of the ready-mixed concrete, and also avoids the problem of pump failure during pumping and clogging of the pump and piping system, and is quick. Construction can be performed. The speed of transportation of the ready-mixed concrete to the construction site is increased by the combined use of the pneumatic transportation and the pumping, so that the concrete can be quickly poured and the construction period can be shortened.

[0077] Pump size reduction during pumping and reduction of energy required for pumping; By using pneumatic transportation, the distance of pumping can be minimized, miniaturization of the pump, and pumping Required energy such as electric power required for pumping can be reduced.

Improvement of concrete workability at high places;
As shown in Fig. 5 (b), even when the concrete construction site is at a high place, the mixture of cement, aggregate, and admixture added as needed is pneumatically transported to the concrete construction site level. By adding water and pumping the concrete to the concrete work site, the supply speed of the ready-mixed concrete to the concrete work site can be increased, and concrete work at a high place can be performed in a short time and extremely easily.

[0079] Cleaning of the construction site; The handling place of the ready-mixed concrete to which water has been added can be limited to the concrete construction site, so that the ready-mixed concrete is kept clean without scattering the ready-mixed concrete throughout the construction site. Can be maintained. further,
FIGS. 2 (b), 3 (b), 4 (b), and 6 show the second preferred embodiment (use of lightweight aggregate) of the third to sixth inventions shown in FIGS. According to a preferred embodiment (use of artificial lightweight aggregate), by utilizing the properties of lightweight aggregate,
The excellent effect of is obtained.

Suppression of segregation of each component of the concrete material due to use of the lightweight aggregate; since the specific gravity of the lightweight aggregate is light, the concrete material can be stored in a predetermined storage tank without segregation of each component in a state where water is not added. Can be transported to a predetermined location. : Excellent adaptability of lightweight aggregate to pneumatic transportation; lightweight aggregate is very suitable for pneumatic transportation due to its low specific gravity, and can easily pneumatically transport a mixture of lightweight aggregate, cement and admixture. it can.

Further, according to the present invention, it is possible to pump the ready-mixed concrete to the concrete work site before the absorption of water into the open cells of the lightweight aggregate, so that the flowability of the ready-mixed concrete can be improved. And the need for pre-soaking of lightweight aggregates, which was conventionally required, is eliminated. In the first preferred embodiment to the third preferred embodiment of the first invention to the sixth invention, and the first to sixth preferred embodiments of the first invention to the sixth invention, as described above, the cement, the coarse aggregate, It is preferable that the mixture with the fine aggregate or the mixture of the cement and the admixture with the coarse aggregate and / or the fine aggregate is a water-free mixture.

The above-mentioned water-free mixture also includes a mixture containing water based on natural water absorption when left in the air. In the first preferred embodiment to the sixth preferred embodiment, the first preferred embodiment to the third preferred embodiment of the first to sixth preferred embodiments, respectively, the cement, the coarse aggregate and / or the fine aggregate may be used. The water content of the mixture with the aggregate or the mixture of the cement, the admixture material, the coarse aggregate and / or the fine aggregate is preferably 1.0% by weight or less.

If the water content exceeds 1.0% by weight, the concrete material is solidified in the transportation process and the workability of the concrete is impaired, and the pneumatic transportation due to the formation of coarse particles or massive coarse particles. This is because it becomes difficult to handle such a case. Furthermore, as the lightweight aggregate used in the second preferred embodiment of the first to sixth inventions described above, any lightweight aggregate having a bone-dry specific gravity smaller than natural gravel or sand can be used. However, an artificial lightweight aggregate obtained by calcining the above-mentioned raw material containing expansive shale, which is preferably a coarse aggregate having an absolute dry specific gravity of less than 2.0, more preferably an absolute dry specific gravity of 1.6 or less, and / or It is more preferable to use an artificial lightweight aggregate that is a fine aggregate having a bone-dry specific gravity of less than 2.3, and more preferably a bone-dry specific gravity of 2.0 or less (third invention to sixth invention).
Preferred embodiment).

This is because not only the use of the above-mentioned artificial lightweight aggregate makes it possible to reduce the weight of concrete by utilizing the original characteristics of the artificial lightweight aggregate, but also to make use of the characteristics of the artificial lightweight aggregate. This is because the above-described problem based on the characteristic described above can be solved.

[0085]

According to the present invention, there is provided a method for handling concrete material which is not subject to time restrictions from the production of ready-mixed concrete to the construction of concrete and which is easy to handle. It became possible to provide. Further, according to the present invention using the lightweight aggregate as the coarse aggregate and the fine aggregate of the concrete material, not only can the weight of the concrete be reduced, but also the segregation of each component can be achieved by utilizing the characteristics of the lightweight aggregate. It is possible to supply a concrete material without any material to the concrete construction site, and it is not necessary to pre-soak lightweight aggregate, which has great industrial significance.

[Brief description of the drawings]

FIG. 1 is a flow sheet showing an example of a method for handling a concrete material according to the present invention.

FIG. 2 is a flow sheet showing an example of a concrete construction method of the present invention.

FIG. 3 is a flow sheet showing an example of a concrete construction method of the present invention.

FIG. 4 is a flow sheet showing an example of a concrete construction method of the present invention.

FIG. 5 is a flow sheet showing an example of a concrete construction method of the present invention.

FIG. 6 is a flow sheet showing an example of the concrete construction method of the present invention.

FIG. 7 is a flow sheet showing a conventional concrete material handling method and concrete working method.

FIG. 8 is a flow sheet showing an example of the manufacturing process of the artificial lightweight aggregate according to the present invention.

Continued on the front page F term (reference) 2E174 AA00 AA03 CA02 CA06 CA11 CA23 CA42 EA00 4G056 AA06 AA08 CA01 CB27 CB34 CD64 CE04 DA01

Claims (12)

[Claims] 1. A method for handling a concrete material, wherein a mixture of cement and coarse and / or fine aggregate is stored in a container, and the container is transported to a concrete construction site. 2. A mixture of cement and coarse and / or fine aggregate is stored in a container, the container is transported to a concrete construction site, and the transported mixture is transported to a predetermined location on the concrete construction site. A method for handling concrete materials, characterized by being transported by air. 3. The method for handling concrete material according to claim 1, wherein the mixture of cement and coarse aggregate and / or fine aggregate further contains an admixture material. 4. The method according to claim 1, wherein at least one of the coarse aggregate and the fine aggregate contains a lightweight aggregate.
3. The method for handling a concrete material according to any one of 3. 5. An artificial lightweight aggregate obtained by calcining a raw material containing expandable shale, wherein at least one of the coarse aggregate and the fine aggregate includes an artificial lightweight aggregate. 3
A method for handling a concrete material according to any of the above. 6. At a concrete construction site, adding water to a mixture of cement and coarse aggregate and / or fine aggregate, pumping the mixture after adding water to a concrete construction site, and using the mixture for concrete construction. Concrete construction method characterized by the following. 7. At a concrete construction site, a mixture of cement and coarse aggregate and / or fine aggregate is pneumatically transported to a predetermined location, water is added at the predetermined location, and the mixture after the addition of water is subjected to concrete construction. A concrete construction method characterized by being pumped to a location and used for concrete construction. 8. A mixture of cement and coarse aggregate and / or fine aggregate is stored in a container, the container is transported to a concrete construction site, and water is added to the transported mixture, and then the concrete construction site A concrete construction method characterized in that it is pumped up to and used for concrete construction. 9. A mixture of cement and coarse aggregate and / or fine aggregate is stored in a container, the container is transported to a concrete construction site, and the transported mixture is pneumatically delivered to a predetermined location on the concrete construction site. Transporting, adding water at the predetermined location, pumping the mixture after the water addition to a concrete application location, and using the mixture for concrete application. 10. The method according to claim 6, wherein the mixture of the cement and the coarse and / or fine aggregate further contains an admixture material. 11. The method according to claim 6, wherein at least one of the coarse aggregate and the fine aggregate contains a lightweight aggregate.
The method for constructing concrete according to any one of claims 1 to 10. 12. The method according to claim 6, wherein at least one of the coarse aggregate and the fine aggregate contains an artificial lightweight aggregate obtained by firing a raw material containing expandable shale.
The construction method of concrete described in any of 10 above.