JPS6038506B2 - How to transport concrete - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for transporting concrete, and in particular to a method for transporting concrete to low places such as underground or under cliffs.

Traditionally, the method of transporting concrete to low-lying areas is
It is broadly divided into the natural fall method and the pump pressure method.

The pumping method is a method in which the slope of the concrete transport pipe is made gentle enough to prevent the concrete from flowing down by itself, and the concrete is meandered, and the concrete is pumped using a concrete pump. With this method, the concrete moves at a constant speed according to the capacity of the concrete pump, so there is no risk of concrete separating. However, it requires a concrete pump, and the long concrete transport pipe increases equipment and operating costs. As the overall head of the upper concrete transport pipe becomes larger, excess or shortage of concrete is likely to occur when concrete pouring work is intermittent, and there is a lot of wasted concrete remaining inside the transport pipe, and furthermore, cleaning the inside of the transport pipe at the end of work is time-consuming. There were drawbacks such as the need for On the other hand, the natural fall method is a method in which concrete is allowed to fall naturally through a transport pipe or chute laid vertically or at a steep slope, and the concrete falls at a high speed and slams into the ground.
As a result, the concrete separated, which had a negative effect on the quality of the concrete. To address this drawback, improvements to the natural fall method include improving the structure of the transport pipe, such as using a flexible pipe and adjusting the diameter of the pipe with compressed air to control the falling speed of concrete. ,
Alternatively, there were some that had a valve mechanism at the required point of the transport pipe to adjust the falling speed of the concrete IJ.In both cases, the concrete falls naturally inside the transport pipe, causing the mortar and bone mounds, which have different specific gravities, to separate. Moreover, it was necessary to improve the transport pipe and associated equipment to a unique structure. In addition, as belonging to the natural fall method, for example, Mochiseki 47-32629, JP-A-53-264
There are 06 concrete transportation methods and devices, but these are constructed so that the mortar and aggregate do not separate, but they all have floats, and the concrete is poured above the floats on the water surface, and the concrete and water are separated. Concrete IJ is transported downward due to the difference in specific gravity. therefore,
The amount of concrete transported is related to the buoyancy of the float, so
It is not possible to transport a large amount of concrete at once, and the construction requires underwater construction or equipment such as tanks and water pipes to float the floats. The present invention has been made to eliminate the above-mentioned drawbacks, and aims to propose a method for transporting concrete in which conventional concrete transport pipes can be used as they are, and separation of concrete is eliminated.

Another object of the present invention is to propose a method for transporting concrete that can clean deposits inside concrete pipes at the same time as transporting the concrete. Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. FIG. 1 is a side view for explaining the method of the present invention, and below is a sectional view of a chute 10 having a hopper 9 at the top. FIG. 2 is a partial longitudinal cross-sectional view showing the state in which the inside of the pipe is cleaned after use as shown in FIG. In FIG. 1, a hopper 1 for pouring concrete is provided above the transport pipe 2, and an intra-pipe movable plug 20 can be press-fitted from above the transport pipe 2 between the hopper 1 and the upper end of the transport pipe 2. An openable valve 18 is provided on the entire cross section of the transport pipe 2, such as a sluice valve, a cock, and a ball valve.

Immediately below the valve 18, there is provided a fluid press-in pipe 19 having a valve that allows the press-fitted intra-pipe transfer plug 20 to be transported inside the pipe in a crimped state by leading to the concrete 4 filled in the transport pipe 2. On the other hand, below the transport pipe 2 is a hinge 21 and a lid 6 that rotates around the hinge to open and close in a hinged manner.
A lever 7 that rotates integrally with the lid 6 is fixed to the lid 6, and a bell 8 is attached to the lever 7 if necessary.
is slidably mounted. Therefore, the lower part of the transport pipe 2 is constantly subjected to a pressing force corresponding to the moment of the dowel 8 by the lid 6. This means that the intra-pipe moving plug 20 is pushed in from above the transport pipe 2, concrete is poured from above, and then the intra-pipe moving plug 20 is guided by the pressure air from the fluid injection pipe 19, and the concrete is poured into the pipe.
When moving down the transport pipe 2, the back pressure that the intra-pipe moving plug 20 receives gradually increases as it descends, which is advantageous for acceleration, but if the pressure of the valve at the lower end of the pipe is appropriately adjusted. Since the air in front of the intra-pipe moving plug is compressed, acceleration is suppressed, allowing it to descend at a nearly constant speed.When it reaches the valve, the valve is opened and the intra-pipe moving plug 2
Emit 0. This allows the concrete to be filled into the pipe without separation. Also, by using this method, there is no risk of damage to the valve mechanism due to natural falling of concrete. Furthermore, since the valve is made up of a lid 6 pressed by a weight 81, the valve is opened and closed according to the pressure inside the pipe, so the degree of the valve is automatically adjusted. In addition,
The pressing force of the lid 6 is adjusted by adjusting the weight of the vehicle weight 8 and the distance of the weight 8 from the fulcrum. Connect the lid 6 to the transport pipe 2
The force for pressing the tip end surface of the holder may be applied by a spring 12 as shown in FIG. When the height of the transport pipe 2 is as high as 3 to 4, the valve mechanism cannot be operated immediately, so a rope 11 is suspended from one end of the lever 7, and the rope 11 is pulled to open the lid 6.
Alternatively, all or part of the heavy mirror may be suspended from the rope 11, and the pressing force of the diamond 6 may be adjusted accordingly. The inner diameter of the upper end of the transport pipe 2 is enlarged by a different pipe in order to make it easier to insert the intra-pipe movable plug 20 and to make it easier to transfer the fluid pressure from the fluid pressure injection pipe 19 to the intra-pipe movable plug 2. Preferably, a valve 18 is provided that matches the larger pipe diameter.

Furthermore, the intra-pipe transfer plug 20 is usually made of an elastic material based on polyurethane foam, and by using a plug whose diameter is equal to or larger than the inner diameter of the transport pipe 2,
Ensure sufficient pressure between the pipe and the plug, and follow the concrete 4
can be sufficiently retained within the tube. The method of the present invention will be explained using the above-mentioned device. After the plug 20 for moving into the pipe is press-fitted from the valve 18 and, if necessary, the valve 18 is closed and pressurized air is injected from the fluid-pressing pipe 19, the concrete is moved from the hopper 1 into the pipe. The transport pipe behind the plug is filled with the concrete, and the fluid pressure from the fluid injection pipe 19 leads the intra-pipe moving plug in front of the concrete, in other words, the concrete is transported while being held behind the intra-pipe moving plug.

In this way, the concrete 4 follows the intra-pipe moving plug 20 without being restricted by the shape of the pipe, such as a straight pipe or a curved pipe, but the amount of concrete 4 is determined by the degree of compression between the pipe and the plug and the fluid pressure. As the intra-pipe moving plug 20 moves within the pipe, the lid 6 next to the valve first gradually releases air, and after releasing the intra-pipe moving plug 20, concrete is discharged. At the higher point of discharge, the concrete 4 receives a hopper 9 shown at the bottom in FIG. 1 and is transported further downwards by a chute 10. In addition, when transporting concrete for the second time or later, the pipe moving plug
It is also possible to clean the remaining concrete 22 in the pipe from the concrete transported earlier.

Of course, when an unexpected situation such as a blockage in the pipe occurs,
Alternatively, when cleaning the transport pipe 2 including the horizontal part, only the intra-pipe moving plug 20 is transported into the transport pipe.
At this time, the plug is transported by injecting fresh air, tap water, or pressurized water from a pump through the fluid injection pipe 19. Even if the pipe is not blocked, for example, when the mixer waiting time exceeds the limit, fluid can be similarly injected from the fluid injection pipe 19 to remove the concrete inside the pipe and prevent the concrete from solidifying. As described above, in the present invention, since the intra-pipe moving plug is transported leading to the concrete,
It is possible to not only transport concrete from the top to the bottom while suppressing the separation phenomenon of concrete, but also to transport concrete continuously, and the amount of concrete transported also depends on the degree of compression between the pipe and plug and the fluid pressure, so it is possible to select the plug and fluid pressure. It can be adjusted freely.

Furthermore, the present invention can be easily carried out on site by simply using a new intra-pipe moving plug, so there is no need for the conventional pumping method or new equipment such as underwater piping.

Furthermore, in the present invention, concrete is always transported using a moving plug inside the pipe, so the inside of the pipe can be cleaned at the same time as the concrete is transported, regardless of whether the pipe is straight or curved. Intraductal occlusion is unlikely to occur.

[Brief explanation of the drawing]

Figures 1 and 2 show the overall apparatus for carrying out the method of the present invention, with Figure 1 being a side view including a partial vertical cross-section showing the chute located below, and Figure 2 being the same as in Figure 1. It is a partial vertical cross-sectional view with a part corrected. 2...Transport pipe, 4...Concrete, 18
...... Valve, 19... Fluid press-in pipe, 20.
...Plug that moves inside the pipe. Figure 1 Figure 2

Claims (1)

[Claims] 1. In a method of transporting concrete from above to a predetermined location below while suppressing the separation phenomenon of concrete, an intra-pipe transfer plug is press-fitted from above the transfer pipe for transporting concrete, and then concrete is filled into the transport pipe behind the intra-pipe transfer plug, A method for transporting concrete, in which the moving plug in the pipe is guided in front of the concrete by fluid pressure.