JPH0459424B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for placing concrete.

Generally, when constructing an underground structure or the like, there is a relatively large height difference between the concrete supply location and the concrete placement location. Conventionally, when concrete is transferred and poured from a high point to a low point in a place where there is a large difference in height, the following method has been used. That is, as shown in FIGS. 3 and 4, a large number of funnel-shaped single pipes 21a are successively inserted between the concrete supply position A at a high point and the concrete placement position B at a low point, and Thus, the connected transfer pipes 21 are arranged vertically, concrete is supplied to the hopper 4 provided at the upper end of the transfer pipes 21, and the concrete is dropped through the transfer pipes 21 to a low-point placement position B. and transport it,
I'm trying to install it. 6 is a scaffold at the supply position A to which the hopper 4 is attached, and 7 is a scaffold at the pouring position B.

However, in the conventional method as described above, the concrete is simply dropped using the transfer pipe 21 as a guide.
Air enters the transfer pipe 21 from the joint between 1a, so that the aggregate with a high specific gravity in the concrete falls before the mortar, and the aggregate and mortar are separated to obtain a high-quality concrete structure. The drawback was that it was not possible.

On the other hand, in order to prevent the above-mentioned separation of concrete materials during concrete pouring, there is a method of pumping concrete using a concrete pump, but this method requires power and is expensive to construct. It had the disadvantage of becoming.

This invention eliminates the drawbacks of the conventional methods as described above, and provides a concrete pouring method that prevents the separation of concrete materials and allows construction of high-quality concrete structures, and that does not require power and has low construction costs. The purpose is to provide

That is, this invention arranges a rigid transfer pipe with an airtight peripheral wall between a supply position at a high point and a casting position at a low point, and this transfer pipe has a structure in which a plurality of single pipes can be attached and detached. It consists of a vertical pipe and a horizontal pipe that are connected to each other, and after closing the on-off valve provided on the horizontal pipe, the transfer pipe is first filled with mortar from its upper end opening, and the air inside the transfer pipe is filled. is discharged upward through the transfer pipe, and then an opening/closing valve is opened to discharge the mortar, and at the same time, the same amount of concrete as the discharge flow rate is continuously supplied to the transfer pipe from its upper end opening. This is the method of placing concrete.

An embodiment shown in FIGS. 1 and 2 will be described below.

In FIG. 1, 1 is a transfer tube 1 used in the method of this invention, and this transfer tube 1 is composed of a large number of single tubes 1.
The single tubes 1a are connected airtightly by a cylindrical joint 3 whose inner surface is lined with rubber 2 or the like (see FIG. 2). A hopper 4 is provided at the upper end of the transfer pipe 1, and a valve 5 is provided at the lower end.

When pouring concrete, the transfer pipe 1 as described above is placed vertically between the scaffolding 6 at the supply position A at a high point and the scaffolding 7 at the pouring position B at a low point, and the valve 5 is turned on. After the valve is closed, mortar is supplied and filled from the hopper 4 into the transfer pipe 1 above the valve, and the air inside the transfer pipe 1 is discharged.
At this time, the mortar is generally in a state close to a fluid state, and by making the inner diameter of the transfer pipe 1 relatively large, the mortar does not become clogged in the middle of the transfer pipe 1. Next, the valve 5 is opened to discharge the mortar to the placement position B, and at the same time, the same amount of concrete as the discharge flow rate of the mortar is continuously supplied to the transfer pipe 1, and this concrete is placed at the placement position B. When placing concrete,
Since mortar is usually placed prior to this, the mortar in the transfer pipe 1 may be discharged to the placing position B as is.

After the mortar is first discharged as described above, concrete will be continuously discharged from the lower end of the transfer pipe 1, but this concrete will be transferred while filling the inside of the transfer pipe 1. Because of this, concrete is poured that does not contain air and therefore does not have aggregate and mortar separated. Since the concrete is transported between the supply position A and the placement position B by falling due to gravity, its discharge flow rate can be easily determined from the density, the height difference H between them, and the like. When the concrete level rises as the concrete is placed, the valve 5 is once closed, and the single pipes 1a are sequentially cut off, for example from the upper part, so that the transfer pipe 1 has an appropriate length, and the valve 5 is closed again. Concrete is placed in an open state. These operations are carried out by the workers at the supply position A and the pouring position B while closely communicating with each other via receivers or the like.

In addition, the height difference H between the vertical pipes of the transfer pipe 1 determines the horizontal transfer distance in the horizontal pipes depending on the concrete's own weight and gravity, so if the height difference H is large, the horizontal single pipe 1a By increasing the number of tubes and pouring concrete from a distance, and then sequentially separating and pouring the single tubes 1a, it is possible to pour concrete over a wide area while leaving the vertical tubes in the same position. .

The present invention is as described above, and includes an airtight rigid transfer pipe consisting of vertical and horizontal pipes configured by detachably connecting a plurality of single pipes, by closing an on-off valve provided on the horizontal pipe. First, air is discharged upward while mortar is supplied and filled, and then concrete is continuously supplied at the same time as the opening/closing valve is opened, so the supplied concrete is separated into aggregate and mortar due to the presence of air. It is possible to obtain a high-quality concrete structure without the fear that the concrete structure will be erected, and when the level of concrete placement increases, the opening/closing valve can be closed and the single pipe at the top end of the vertical pipe can be removed. Therefore, it can be easily dealt with, and the installation area can be easily expanded or reduced by closing the opening/closing valve according to the height difference of the vertical pipe and increasing or decreasing the length by installing or removing a single horizontal pipe. Furthermore, the concrete is transferred only by its own weight and gravity, and there is no need to prepare special means for its supply.
Not only is the construction work easy, but it also has the effect of significantly reducing construction costs.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of the method of the present invention, Fig. 2 is an enlarged cross-sectional view showing the connecting part of the same single pipe as above, Fig. 3 is a front view showing the conventional method, and Fig. 4 is The perspective view which expands and shows the connection part of the single pipe same as the above. 1... Transfer pipe, 1a... Single pipe, 3... Joint, 5... Valve, 6, 7... Scaffolding, A... Supply position, B... Casting position.

Claims (1)

[Claims] 1. When concrete is transferred and placed from a supply position at a high point to a placement position at a low point, a rigid transfer system in which a peripheral wall is airtight between the supply position and the placement position This transfer pipe consists of a vertical pipe and a horizontal pipe, each of which is composed of a plurality of single pipes removably connected.After closing the opening/closing valve provided on the horizontal pipe, first Mortar is supplied from the upper end opening of the pipe, and the air in the transfer pipe is discharged from the upper end opening of the vertical pipe through the transfer pipe, and then the on-off valve is opened to discharge the mortar to the outside from the tip of the horizontal pipe. A concrete placing method characterized by continuously supplying concrete in an amount equal to the discharge flow rate from the upper end opening of a vertical pipe at the same time.