JPH0613790B2 - How to place concrete mortar - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a). BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses additives such as a quick-setting agent and a solidification retarder as base concrete mortar (here, "concrete.
"Mortar" means "concrete" or "mortar". The same applies below. ) Is added at the pouring site to separate concrete and mortar according to the pouring site.

(b). Conventional technology Conventionally, additives such as quick-setting agents and setting retarders have been added to concrete
When adding to mortar and separating each part, addition of additives to concrete mortar is done at the concrete mortar manufacturing plant, and concrete mortar to which these additives have been added is struck by an agitator truck. It was transported to the construction site and placed there.

(c). Problems to be Solved by the Invention However, in such a method, even if the amount of the concrete mortar to which the additive is added is small, a minimum of one agitator truck of the concrete mortar is carried into the pouring site. Often, most of it was wasted. In addition, in order to obtain concrete / mortar containing the necessary additives, it is necessary to maintain close contact with the casting site and the concrete / mortar plant at all times to proceed with the work, which is extremely complicated. However, there was a drawback that it took a lot of time and effort.

The present invention, in order to eliminate the above-mentioned disadvantages, even when the required amount of the additive-added concrete mortar is small,
It is an object of the present invention to provide a concrete pouring method that enables pouring concrete and mortar without waste and is simple and hassle-free.

(d). Means for Solving the Problems That is, the present invention has a concrete supply pipe (2), and a plurality of stirring blades are provided at the tip portion of the concrete supply pipe (2) for supplying concrete mortar (6). (5a,
5g) is provided so as to be rotatable and multiply provided in the supply direction of the concrete and mortar (6), and the concrete discharge pipe (1) is provided with the additive supply means (5c, 5d) at the tip portion thereof. At the time of casting, the base concrete mortar (6) to which the additive is not added is supplied to the concrete supply pipe (2), and the additive is supplied from the additive supply means (5c, 5d) according to the site to be placed. (7) is selectively supplied to the base concrete mortar (6).

It should be noted that the numbers in parentheses indicate the corresponding elements in the drawings for the sake of convenience, and thus the present description is not limited to the description in the drawings. The same applies to the section "(e). Action" below.

(e). Action With the above-described configuration, the present invention carries the base concrete mortar (6) to which the additive (7) has not been added into the setting site and, if necessary, at the tip of the concrete supply pipe (2), Acts to add additives.

(f). Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view showing an example of a concrete discharge pipe used in the present invention, FIG. 2 is a view of the discharge port portion of the concrete discharge pipe shown in FIG. It is a figure which shows the one aspect | mode of an installation.

As shown in FIG. 1, the concrete discharge pipe 1 has a concrete conveying pipe 2, and the concrete conveying pipe 2 is connected to a concrete mortar pressurizing means such as a concrete pump not shown. A tip portion 2a of the concrete conveying pipe 2 is formed in a shape that is bent slightly upward in the figure, and a cylindrical cover 3 made of a flexible material such as rubber is attached to the tip portion 2a. The tip end portion 2a is connected so as to cover the outer periphery thereof. The cover 3 extends to the left in the figure, and its tip portion is a discharge port 3a having a circular cross section. In addition, a hollow rotary shaft 5 is provided in the concrete carrier pipe 2.
Is rotatably driven so as to penetrate through the pipe wall 2b of the concrete transport pipe 2, and is fixed to the concrete transport pipe 2 via a swivel joint 13 at the right end of the rotary shaft 5 in the figure. Drive motor 15 is connected. An additive supply hose 16 is connected to the swivel joint 13, and the additive supply hose 16 can supply additives such as a quick-setting agent and a solidification retarder to an additive supply passage 5c described later. Further, two stirring blades 5a and 5g are provided at a position corresponding to the cover 3 at the tip of the rotary shaft 5 so as to be doubled in the directions of arrows A and B, which are the directions of supplying concrete and mortar. Each stirring blade 5a, 5g has four blades 5b formed at a 90 ° pitch, as shown in FIG. As shown in FIG. 1, each blade 5b of the stirring blade 5a on the right side of FIG. 1 and the rotary shaft 5 are supplied with additives such as a quick-setting agent and a coagulation retarder. Are formed to communicate with each other, and each blade 5b of the stirring blade 5a is
A large number of additive addition holes (not shown) are formed in the surface 5e of the above so as to communicate the additive supply passage 5d with the outside.

On the other hand, the construction site 9 where concrete and mortar are laid.
As shown in FIG. 3, it has a horizontal member 10 on which concrete mortar is placed in the horizontal direction and a vertical member 11 installed upright on the horizontal member 10.

Since the concrete discharge pipe 1 has the above-described structure, when the concrete discharge pipe 1 is used to perform the work of placing the concrete / mortar 6 at the placement site 9, first the horizontal member 10 is placed. After that, the vertical member 11 is placed. However, since there is time between the driving of the horizontal member 10 and the vertical member 11, when the vertical member 11 is driven and the vertical member 11 causes volume expansion during solidification,
The horizontal member 10 has entered the volume contraction period after the initial volume expansion period, and stress is generated between them. Therefore,
A solidification delay layer 12 made of concrete and mortar to which a solidification retarder is added is provided at the connecting portion between the horizontal member 10 and the vertical member 11, and the solidification delay layer 12 absorbs volume expansion and volume contraction occurring between them. To do so.

In this case, when placing the horizontal member 10 first, the base concrete mortar 6 to which the additive is not added, which has been transported from the concrete mortar plant, is used as the concrete transport pipe of the concrete discharge pipe 1. 2 is supplied by driving a concrete pump (not shown). The concrete mortar 6 supplied to the concrete conveying pipe 2 is pressure-fed from the right side of FIG. 1 in the direction of the cover 3, further passes between the stirring blades 5a and 5g, and is discharged to the outside from the discharge port 3a. It is placed in a mold forming 10. At this time, since no additive is added to the concrete mortar 6 from the additive supply paths 5c and 5d, the concrete mortar 6 to which no additive is added is cast on the horizontal member 10. In this way, when the base concrete mortar 6 in the horizontal member 10 portion has been cast, the solidification retardation layer 12 is then cast. For setting the solidification retardation layer 12, while supplying the base concrete / mortar 6 through the concrete conveying pipe 2, the drive motor 15 rotationally drives the rotary shaft 5 to add the additive supply path 5c to the rotary shaft 5. The solidification retarder 7 is supplied to 5d through the additive supply hose 16 and the swivel joint 13. Then, the stirring blades 5a and 5g in the cover 3 rotate together with the rotation of the rotating shaft 5, and the base concrete that has been pressure-fed in the concrete conveying pipe 2 toward the discharge port 3a.
Stir mortar 6. Further, the solidification retarder 7 is added and supplied through the additive supply passages 5c and 5d from the additive addition hole provided in each blade 5b of the stirring blade 5a, and the added solidification delay agent 7 is concrete mortar. 6 and 6 are discharged to the outside from the discharge port 3a while being uniformly stirred by the double stirring blades 5a and 5g. In this way, the casting of concrete mortar in the solidification retardation layer 12 portion is smoothly performed in a form in which an appropriate amount of the solidification retarder is uniformly added.

In this way, when the placing of the concrete mortar 6 in the solidification retardation layer 12 is completed, the vertical member 11 that follows is placed.
Concrete concrete mortar 6 is placed on the vertical member 11, but rotation of the rotary shaft 5 is stopped on the vertical member 11 and addition of the solidification retarder 7 via the additive supply paths 5c and 5d is stopped. Then, the base concrete mortar 6 to which the additive is not added, which is sent through the concrete transport pipe 2, does not have any additive added to the stirring blades 5a and 5g, and the discharge port 3a part. Is cast into the formwork that builds the vertical member 11.

Although the concrete / mortar 6 contains many aggregates, the cover 3 covering the outer circumferences of the stirring blades 5a and 5g is made of a flexible material, so that the bones and the like. Even if the material or the like is sandwiched between the tip 5f of the blade 5b of the stirring blades 5a, 5g and the cover 3, the cover 3 is deformed, so that the aggregate or the like is caught between the blade 5b and the cover 3. The mixing operation of the concrete mortar 6 and the solidification retarder 7 by the stirring blades 5a and 5g is smoothly performed.

Further, although the above-described embodiment has described the case where the two stirring blades 5a and 5g for stirring the concrete and mortar are provided, the present invention provides the stirring blades 5a and 5g in multiple numbers in the concrete and mortar supply direction. As a matter of course, any number of two or more may be provided.

Further, in the above-mentioned embodiment, the case where the solidification retarder 7 is added as an additive to the base concrete mortar to which the additive is not added is described, but the additive is added to the concrete mortar 6 as an additive. Any material can be used as long as it can be used. For example, a quick-setting agent, a fluidization accelerator, etc. can be added in addition to the solidification retarder. Further, it is naturally possible to pour the concrete mortar 6 at each piling portion while properly using these additives. For example, in the case of pillar / beam structures, etc., concrete / mortar is placed in the form of a base concrete / mortar with a quick-setting agent added to the beam part that needs to be solidified immediately, The base concrete and mortar can be poured directly into the part without adding a quick-setting agent.

(g). EFFECTS OF THE INVENTION As described above, according to the present invention, a concrete feed pipe such as the concrete feed pipe 2 is provided, and a plurality of stirring blades are provided at the tip portion of the concrete feed pipe for feeding the concrete mortar 6. The concrete discharge pipe 1 is provided with 5a and 5g which are rotatably driven and are multiply provided in the supply direction of the concrete and mortar 6, and additive supply means such as additive supply paths 5c and 5d are provided at the tip portion. ,
At the time of placing, the base concrete and mortar with no additive added are supplied to the concrete supply pipe, and additives such as quick-setting agent and solidification retarder are selected from the additive supply means according to the place to be placed. Since it is configured so that it is supplied to the base concrete and mortar, it becomes possible to freely add additives to the base concrete and mortar to which no additive has been added at the construction site. Despite the small amount, it is possible to eliminate the situation where the concrete mortar containing the additive for one agitator truck is brought in from the concrete plant, and the concrete mortar can be placed without waste. Is possible. In addition, additives can be added arbitrarily at the construction site simply by bringing in concrete and mortar without additives from the concrete plant, so addition between the construction site and the concrete / mortar plant is possible. Since there is no need to contact with the agent, a simple and hassle-free placement work is possible.

[Brief description of drawings]

FIG. 1 is a front view showing an example of a concrete discharge pipe used in the present invention, FIG. 2 is a view of the discharge port portion of the concrete discharge pipe shown in FIG. It is a figure which shows the one aspect | mode of an installation. 1 ... Concrete discharge pipe 2 ... Concrete supply pipe (concrete transfer pipe) 5a, 5g ... Stirring blades 5c, 5d ... Additive supply means (additive supply passage) 6 ... Concrete mortar 7 ... Addition Agent (coagulation retarder)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideaki Gomi 1-27-7 Nagasawa, Tama-ku, Kawasaki City, Kanagawa Prefecture (56) References Japanese Patent Publication No. Sho 61-32453 (JP, B2)

Claims (1)

[Claims] 1. A concrete supply pipe, wherein a plurality of stirring blades are rotatably driven and are multiply provided in a concrete / mortar supply direction at a tip portion of the concrete supply pipe for supplying concrete / mortar. Using a concrete discharge pipe provided with an additive supply means at the tip part, at the time of placing, the base concrete mortar with no additive added is supplied to the concrete supply pipe, depending on the place to be placed. A method for placing concrete mortar configured such that the additive is selectively supplied to the base concrete mortar from the additive supply means.