JPH0469704B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention is based on the use of an quick-setting agent and concrete mortar (herein, "concrete mortar").
Meaning of "concrete" or "mortar". Same below. ) Concrete discharge pipe capable of discharging concrete while stirring it in a uniform state.

(b) Conventional technology Normally, when supplying a quick-setting agent to concrete or mortar, it is generally added at the tip of a concrete discharge pipe.

(c) Problems to be Solved by the Invention However, normally, the concrete and mortar discharged from the discharge pipe is immediately poured into a formwork, etc., so that the quick-setting agent and the concrete and mortar are mixed at the tip of the discharge pipe. There is a need for concrete to be mixed in a good condition, and it has been desired to develop a concrete discharge pipe that can do this.

In addition, in Japanese Patent Application Laid-Open No. 60-156864, compressed air is rotated using fixed vanes at the tip of a concrete discharge pipe to create a turbulent flow, and the turbulent compressed air is activated. By adding additives such as agents, and compressed air with those additives added,
A concrete discharge pipe has been disclosed in which building materials conveyed through the concrete supply pipe are supplied in a particulate suspended state by being sprayed to the outside from a nozzle tip.

In such a method, building materials floated by compressed air are discharged from a nozzle, resulting in the generation of a large amount of dust during pouring, resulting in an extremely poor working environment at the pouring site. In addition, since additives and building materials are stirred using compressed air as a medium, a compressed air supply system is required in addition to the additive supply system, which prevents the structure of the concrete discharge pipe itself from becoming complicated and large. do not have. Moreover,
With the method of adding additives to compressed air, there is no guarantee that the additives will be mixed evenly with the compressed air, and furthermore, there is no guarantee that the compressed air containing the additives will be mixed evenly with the building materials. Since there is no guarantee as to whether or not additives will be applied, there are many problems such as difficulty in uniformly supplying additives to building materials.

In view of the above circumstances, the present invention does not use compressed air when mixing the quick-setting agent, does not generate dust during pouring, has a simple structure, and mixes the quick-setting agent with concrete and mortar. The purpose of this invention is to provide a concrete discharge pipe in which concrete is mixed uniformly and in good condition.

(d) Means for Solving the Problems That is, the present invention has a concrete conveying path in which a discharge port 3a is formed at the tip and connects a concrete/mortar pumping means and the discharge port, through which concrete/mortar is conveyed. The concrete supply pipes 2 and 3 are formed, and a plurality of agitating blades 5a are provided in the concrete conveying path at the discharge port portion to transfer the concrete mortar 6 conveyed through the concrete conveying path to the agitating blades. so that it can be freely stirred,
Moreover, quick-setting agent supply channels 5 are provided in multiple directions in the concrete/mortar supply direction, and are provided in the stirring blades and the rotating shaft.
c, 5d are formed in a form that communicates with each other,
A quick-setting agent addition hole is formed through the stirring blade so that the quick-setting agent supply path and the concrete conveyance path are communicated with each other.

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 in the drawings. The same applies to the column "(e) Effect" below.

(e) Effect With the above-described configuration, the present invention allows the concrete mortar 6 conveyed through the concrete conveyance path of the concrete supply pipes 2 and 3 to pass through the quick setting agent addition hole of the stirring blade provided in the conveyance path. The quick-setting agent is directly added to the concrete mortar, and at the same time, it is mechanically stirred by the multiple stirring blades 5a and acts to be placed.

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

FIG. 1 is a front view showing an embodiment of a concrete discharge pipe according to the present invention, and FIG. 2 is a view taken along the arrows of the discharge port portion of the concrete discharge pipe shown in FIG.

As shown in FIG. 1, the concrete discharge pipe 1 has a concrete conveyance pipe 2, to which a means for pumping concrete and mortar such as a concrete pump (not shown) is connected, and a cover 3 to be described later. A concrete conveyance path through which concrete and mortar are conveyed is formed by the concrete conveyance pipe 2 and the concrete conveyance path connecting the discharge port 3a of the cover 3 and the means for pumping the concrete and mortar. The tip 2a of the concrete conveyance pipe 2 is bent slightly upward in the figure, and a cover 3 formed in a cylindrical shape from a flexible material such as rubber is attached to the tip 2a. It is connected in a manner that covers the outer periphery of the tip portion 2a. The cover 3 extends to the left in the figure, and its tip has a discharge port 3 having a circular cross section.
It becomes a. Further, a hollow rotating shaft 5 is provided in the concrete conveying pipe 2 so as to be freely rotatable so as to pass through the pipe wall 2b of the concrete conveying pipe 2, and the tip of the rotating shaft 5 in the concrete conveying path is Three stirring blades 5 are installed at the position corresponding to the cover 3.
A is provided in three layers in the directions of arrows A and B, which are the directions in which concrete and mortar are supplied. Each stirring blade 5a has four blades 5b formed at a 90° pitch, as shown in FIG.
As shown in FIG. 1, each of the blades 5b and the rotating shaft 5 is provided with an quick-setting agent supply path 5c, through which the quick-setting agent is supplied.
5d are formed so as to communicate with each other. In addition, on the surface 5e of each blade 5b, an quick-setting agent supply channel 5 is provided.
A large number of quick-setting agent addition holes (not shown) are drilled to communicate d with the outside, that is, the concrete conveyance path.

Since the concrete discharge pipe 1 has the above-mentioned configuration, concrete mortar 6 is added to the concrete mortar 6 with a quick-setting agent 7 added thereto, using the concrete discharge pipe 1 to form a formwork (not shown), etc. When supplying concrete to concrete, first, a concrete pump (not shown) is driven to supply concrete/mortar 6 to be placed to concrete conveying pipe 2. The concrete mortar 6 supplied to the concrete conveyance pipe 2 passes through the concrete conveyance path,
It is fed under pressure from the right side of FIG. 1 toward the cover 3, passes between the stirring blades 5a, and is discharged to the outside from the discharge port 3a. The quick-setting agent 7 is supplied to the quick-setting agent supply paths 5c and 5d. Then, the stirring blades 5a inside the cover 3 rotate together with the rotation of the rotating shaft 5, and mechanically stir the concrete mortar 6 that has been pressure-fed inside the concrete conveying pipe 2 toward the discharge port 3a. Further, from the quick-setting agent addition hole provided in each blade 5b of the stirring blade 5a, the quick-setting agent 7 is supplied to the quick-setting agent supply path 5.
The quick-setting agent 7 is directly added to the concrete mortar conveyed into the concrete conveyance path through the concrete mortar 6 and the concrete mortar 6, and the added quick-setting agent 7 is added to the stirring blades 5a provided in three layers. The liquid is mechanically and uniformly stirred and is discharged from the discharge port 3a to the outside.

Note that the concrete mortar 6 contains a large amount of aggregate, but since the cover 3 that covers the outer periphery of the stirring blade 5a is made of a flexible material, such aggregates, etc. is the blade 5 of the stirring blade 5a
Even if it is caught between the tip 5f of b and the cover 3, the cover 3
is deformed, such aggregates, etc. will not be caught between the blades 5b and the cover 3, and the concrete/mortar 6 by the stirring blades 5a.
The stirring operation of the quick-setting agent 7 is performed smoothly.

Further, in the above embodiment, three stirring blades 5a for stirring concrete/mortar were provided, but the present invention provides two stirring blades 5a as long as they are provided multiple times in the direction in which concrete/mortar is supplied.
Of course, any number of sheets may be provided.

(g) Effect of the Invention As explained above, according to the present invention, the discharge port 3a is formed at the tip of the concrete and the concrete/mortar 6 that connects the concrete/mortar pumping means and the discharge port is conveyed. Concrete conveyance pipe 2 and cover 3 with a conveyance path formed therein
A plurality of stirring blades 5a are provided in the concrete conveyance path at the discharge port portion so that the concrete and mortar conveyed through the concrete conveyance path can be freely stirred by the stirring blades. , are rotatably driven via a rotating shaft 5 and provided in multiple directions in the concrete/mortar supply direction, and quick-setting agent supply channels 5c and 5d are formed in the stirring blades and the rotating shaft so as to communicate with each other; Since the quick-setting agent addition hole is drilled through the stirring blade so that the quick-setting agent supply path and the concrete conveyance path are communicated with each other, the concrete and mortar that are conveyed through the concrete conveyance path of the concrete supply pipe are In this method, the quick-setting agent is added directly into the concrete/mortar from the quick-setting agent addition hole of the stirring blade provided in the conveyance path, and at the same time, it is mechanically stirred by the stirring blades installed in multiple layers. will be established. Therefore, since the quick-setting agent is directly added to the concrete and mortar in the concrete conveyance path without intervening air flow, it is easy to control the addition of the quick-setting agent to the concrete and mortar, and it is uniform. This makes possible the addition operation. Moreover, since the concrete and mortar do not become suspended particles when discharged from the discharge port, there is no generation of dust, and it is possible to prevent the working environment at the pouring site from deteriorating due to pouring. I can do it.

In addition, immediately after the quick-setting agent is directly added to the concrete/mortar from the stirring blade, it is mechanically stirred with the concrete/mortar by the stirring blades, which are installed multiple times in the concrete/mortar supply direction in the concrete conveyance path. Therefore, stirring of the quick-setting agent and the concrete/mortar is carried out reliably in such a way that both are uniformly mixed, and the quality of the poured concrete/mortar can be maintained at a high level.

In addition, since the quick-setting agent can be added directly to the concrete and mortar in the concrete conveyance path, there is no need to install a compressed air supply system at the discharge port, and the structure of the concrete discharge pipe can be simplified. .

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of a concrete discharge pipe according to the present invention, and FIG. 2 is a view of the discharge port portion of the concrete discharge pipe shown in FIG. 1... Concrete discharge pipe, 2... Concrete supply pipe (concrete conveyance pipe), 3... Concrete supply pipe (cover), 5a... Stirring blade, 5c,
5d... Rapid setting agent supply path, 6... Concrete/mortar, 7... Rapid setting agent.

Claims (1)

[Scope of Claims] 1. A concrete supply pipe having a discharge port formed at its tip and a concrete conveyance path through which concrete/mortar is conveyed, which connects the concrete/mortar pumping means and the discharge port; A plurality of stirring blades are rotatably driven in the concrete conveyance path of the discharge port portion through a rotating shaft so that the concrete mortar conveyed through the concrete conveyance path can be freely stirred by the stirring blades. , and are provided in multiple layers in the concrete/mortar supply direction, forming quick-setting agent supply channels in the stirring blade and rotating shaft so as to communicate with each other, and providing quick-setting agent addition holes in the stirring blade for supplying the quick-setting agent. A concrete discharge pipe configured by penetrating through the concrete conveyance path to communicate with the concrete conveyance path.