JPH0361822B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a method and apparatus for transporting materials such as cement milk and mortar mixed and stirred by a mixer to a construction site or the like through a transport pipe. [Conventional technology] In order to transport cement milk produced by mixing and stirring water, cement, etc. in a conventional mixer to a construction site via a pipe, it is pumped to one stage or several stages depending on the distance. Alternatively, as shown in FIG.
At that point, the valve 4 of the transport pipe 5 is opened and pressurized air is blown in from the pressurized air inlet 3b, so that the cement milk is pumped through the transport pipe 5 together with the pressurized air. 2 is an air reservoir, 1 is a compressor, and 9 is a mixer at the work site. [Problems to be Solved by the Invention] According to the above-described pressure-feeding method and device, most of the pressure-feeding from the pressure-feeding base point to a high location remains in the transport pipe;
It is not possible to send the entire amount, or in some cases, it is not possible to pump it at all.If it is horizontal, the air will overhang the cement milk, making it difficult to pump the entire amount of cement milk to the destination. It takes time (more than 12 minutes) to pump cement milk close to the pumping point, and when pumping to a place where the transport pipe is high and low from the pumping base point, some cement milk may remain in the transport pipe due to air overflow. There are drawbacks such as the impossibility of pressure feeding and the impossibility of force feeding of mortar (only about 50% of the mortar can be fed and remains in the transport pipe). The present invention has been made to improve the above-mentioned drawbacks. [Means for Solving the Problems] The present invention opens the air vent on the pressure-feeding tank, connects the pressure-feeding tank, a measuring section connected to its outlet via a valve, and connects both ends to the measuring section. The pressure inside the sliding piston feeding device connected via the valve provided on the pump is reduced, then the valve at the outlet of the pressure feeding tank is closed, the valve provided at the feeding port provided on the pressure feeding tank is opened, and a predetermined amount is poured from there. A material such as cement milk or mortar is introduced into the material input port, and a sliding piston made of an elastic material and sliding while sealing the inner wall of the transport pipe with its outer periphery is inserted into the material input port by the sliding piston inputting device. Insert the material between the valves at both ends, and as soon as the specified amount of material has been injected into the pressure-feeding tank, close the air vent valve and inlet valve, then open the pressure air inlet valve, and from here. Pressurized air is supplied to the pressure-feeding tank to force-feed a predetermined amount of material into the transport pipe connected to the sliding piston charging device, then the valves on the transport pipe side of the valves at both ends of the sliding piston charging device are closed, and then Open the air vent to reduce the pressure inside the pressure-feeding tank, measurement unit, and sliding piston feeding device, then close the valve at the outlet of the pressure-feeding tank, and introduce the material into the pressure-feeding tank from the input port. At the same time, close the valves at both ends of the sliding piston insertion device that are connected to the measuring section, insert the sliding piston into the sliding piston insertion device, and push it between the valves at both ends.
Next, pressurized air is supplied from the pressure air inlet on the pressure-feeding tank, and the valve at the outlet of the pressure-feeding tank and the valves at both ends of the sliding piston feeding device are sequentially opened to force-feed a predetermined amount of material into the transport pipe, and the above operations are performed. A cement milk/mortar pressure feeding method characterized by repeatedly pumping the material and sliding pistons before and after sandwiching the same using pressure air, and an inlet for inputting materials such as cement milk or mortar, and a pressure air blowing port, A pressure-feeding tank equipped with an air vent, a measuring section connected to the pressure-feeding tank and equipped with a flowmeter in the middle, and a sliding section connected to the measuring section and between the measuring section and the transport pipe. It consists of a sliding piston loading device for loading the piston, and a transport pipe connected to and extending from the sliding piston. It consists of a cement milk and mortar pumping device characterized by: [Example] Hereinafter, an example of the present invention will be described in detail based on the attached drawings. In the figures, parts and parts corresponding to those of the conventional example will be described with the same reference numerals.
FIG. 1 is a structural diagram showing an embodiment of the present invention, and 3 is an introduction device, which is connected to a pressure-feeding tank 3e with an inlet 3a for cement milk or mortar from a mixer, a pressurized air inlet 3b, and an air vent 3c. and a valve is installed at each inlet. Further, a pressure gauge 3d is attached to the pressure feeding tank 3e. 1 and 2
4 is a compressor and air reservoir for sending pressurized air to the pressurized air inlet 3b, and 4 is a pressure feeding tank 3e.
This is the outlet valve. 5 is a measuring section and the valve 4
It consists of a pipe connecting the sliding piston loading device 6 and a flow meter 5a. Sliding piston loading device 6
Valves 6b and 6c are provided at the front and rear, and the sliding piston 6a is pushed in at the entrance of the conduit 8. 6e is a cap of the sliding piston loading device 6. The active piston 6a is made of a compressible and elastic foamed resin such as urethane foam, and may have a spherical shape as shown in the figure, but a cylindrical shape is most suitable. Reference numeral 8 designates a transport pipe through which cement milk or mortar is pinched and pumped back and forth by the sliding piston introduced by the sliding piston introduction device 6, and 9 is an on-site mixer. A wire mesh is stretched over the top of the mixer, and the top of the mixer is formed into a box shape with an open top, through which the tip of the transport pipe 8 penetrates from the side, and the material discharged from the tip of the transport pipe 8 enters the mixer under the mesh. The sliding piston remains on the net and can be retrieved. FIG. 2 is a structural diagram showing another embodiment of the present invention, in which a jet mixer is used. In the previous embodiment, a pressure-feeding tank 3e is used as an introduction part, but in this embodiment, Cement milk or mortar is introduced from an input port 3a through a direct introduction pipe 3f as an introduction section, and pressurized air is blown from a pressure air injection port 3b. Next, a procedure for pumping cement milk or mortar using the apparatus of the present invention will be described (hereinafter, cement milk or mortar will be referred to as a material). The first material pressure feeding procedure is as shown in FIG. 1, by opening the valve of the air vent 3c and
e, introduction pipe (between the pressure-feeding tank 3e and the valve of the input port 3a, the valve of the pressure air inlet 3b), the measurement part 5,
Then, the inside of the sliding piston charging device 6 is made equal to the atmospheric pressure, then the valve 4 is closed, and the charging port 3a is opened. Next, material is charged through the charging port 3a, and while the material is being charged, the cap 6e is removed, and the sliding piston 6a is closed. Insert one into the sliding piston device 6, push it between the valves 6b and 6c with a rod or the like, and then close the cap 6e. Then, a predetermined amount of material is transferred to the pressure-feeding tank 3e.
When the air is injected, the valve of the air vent 3c and the valve of the air inlet 3a are closed, and then the pressure air inlet 3b is closed.
When the pressure inside the pressure feeding tank 3e rises to 1.8Kg/ ^cm2 , valves 4 and 6b are opened in sequence, and the pressure that has dropped at this time returns to the original pressure, and at the same time the valves are opened. 6c is opened and the material is sent into the transport pipe 8. Then, a predetermined amount of material (all the material input from the input port 3a) is transferred to the valve 6.
After passing through the air vent 3c (use the flowmeter 5a or a timer (not shown) to confirm passage), close the valve 6c and at the same time open the valve of the air vent 3c. The pressure inside the sliding piston charging device 6 is reduced to the same as atmospheric pressure, and then the valve 4 is closed (at this time, the material is passing through the valve 6c, and the pressure inside the sliding piston charging device is reduced to the same pressure as the atmosphere). ). Next, the second material injection and pressure feeding begins. While putting the second material into the pressure-feeding tank 3e, the valve 6b
, remove the cap 6e, set the second sliding piston 6a in the sliding piston loading device,
A wire mesh is stretched over the top of the mixer, and the top is formed into a box shape with an open top, and the transport pipe 8 is connected from the side.
The tip of the transport pipe 8 penetrates into the mixer, and the material discharged from the tip of the transport pipe 8 remains on the screen and can be collected by the mixer under the screen. Push the sliding piston 6a between the valves 6b and 6c with a rod or the like, then close the cap 6e. As soon as a predetermined amount of material is put into the pressure-feeding tank 3e, the air vent 3c is opened.
Close the valve and the valve of the inlet 3a, open the valve of the pressurized air inlet 3b and supply pressurized air to raise the pressure in the pressure tank 3e to about 1.8 kg/ ^cm2 , and open the valves 4 and 6b sequentially. At the same time that the lowered pressure recovers to the original pressure, the valve 6c is opened and the material is sent into the transport pipe 8. After a predetermined amount of material inputted from the input port 3a passes through the valve 6c, the valve 6c is closed, and the sliding piston 6c is inputted as described above.After that, the inputting, pressure feeding, and inputting of the sliding piston 6c are performed as described above. It is something that is repeated. After completing the pressure feeding of the necessary material, the valves 4, 6b, and 6c are opened and pressurized air is supplied from the pressurized air blowing port 3b until the material is no longer in the transport pipe 8. By performing the above method at predetermined intervals, it becomes possible to simultaneously pump materials 7 having different specific gravity, particle size, and density one after another, as shown in FIG. Further, during pressure-feeding, it can also be fed to a sub-blunt from any location along the transport pipe using a take-out facility (not shown). Another embodiment shown in FIG. 2 is a case where a jet mixer is used, and the valves of the inlet 3a and the pressure air inlet 3b are closed first, and the sliding piston 6a is introduced into the transport pipe 8 by the sliding piston introducing device 6. Then, when the valve of the input port 3a is opened and the cement milk or mortar is press-filled with the jet mixer, the valve of the input port 3a is closed and the valve of the pressurized air blowing port 3b is opened to inject a predetermined amount of cement milk or mortar with pressurized air. The sliding piston 6a is inserted into the pipe by the sliding piston device 6 at the time of passing through the valve 6b, and the rest is the same device as in the previous embodiment. An example in which the transport pipe is horizontal is shown below. Figure 4 shows water and cement milk being pumped at pressures of 150 and 2 Kg/cm ² , respectively, using a conventional pressure feeding device.
A graph showing the relationship between the amount reached and the arrival time when the water and cement milk are pumped almost horizontally for 718.3 m. Figure 5 shows the amount reached when water and cement milk are pumped under the same conditions as in Figure 4 using the pumping device of the present invention. It is a graph showing the relationship between arrival time and arrival time. As shown in Figure 4, according to the conventional pumping device, if the pumping distance is long, 1:1 cement milk will arrive in 3 minutes and 20 seconds, and at this point about 67% of the cement milk will be pumped. Air takes longer than milk to rise, and it takes about 12 minutes to pump 97% of the milk. However, as shown in FIG. 5, according to the pumping device of the present invention, at the same pumping distance as shown in FIG. 4, the cement milk of 1:1 reaches the pump in 3 minutes and 26 seconds and simultaneously pumps approximately 100%. Pressure feeding of mortar with a conventional pressure feeding device is not carried out because mortar remains in the pipe and only about 50% of the input amount can be fed, but the pressure feeding device of the present invention is used to perform pressure feeding when the transport pipe is horizontal. However, the results were as shown in the table below.

[Table] [Effects of the Invention] As explained in detail above, the present invention provides the following effects. ○B It is possible to pump from the pumping base point to high places. ○B Pressure feeding is possible even if the transport pipe has a height relative to the pumping base point. ○C If it is horizontal, it can be transported over long distances and the pumping time can be shortened. ○D It is possible to pump cement mortar under pressure. ○E Since the sliding piston pinches the cement milk or mortar at the front and back and pumps it, an accurate amount can be transported and the amount can also be controlled. ○F The inside of the transport pipe is cleaned by a sliding piston and no material accumulates, so there is no sedimentation loss.

[Brief explanation of drawings]

Figure 1 is a structural diagram showing one embodiment of the present invention, Figure 2 is a structural diagram showing an embodiment of the present invention.
Figure 3 is a structural diagram showing another embodiment of the present invention, Figure 3 is a structural diagram of a conventional pumping device, and Figure 4 is the amount reached and reached when water and cement milk are pumped by the conventional pumping device. Graph showing the relationship with time. FIG. 5 is a graph showing the relationship between amount reached and arrival time when water and cement milk are pumped by the pumping device of the present invention. 1... Compressor, 2... Air reservoir, 3... Introducing device, 3a... Inlet, 3b...
Pressure air inlet, 3c...Air vent, 3d...Pressure gauge, 3e...Pressure tank, 3f...Introduction pipe,
4...Valve, 5...Measuring part, 5a...Flowmeter,
6... Sliding piston input device, 6a... Sliding piston, 6b, 6c, 6d... Valve, 7... Material, 8... Transport pipe, 9... Mixer.

Claims (1)

[Claims] 1. Opening the air vent on the pressure-feeding tank,
The pressure inside the pressure-feeding tank, the measuring section connected to its outlet via a valve, and the sliding piston input device connected to the measuring section via valves provided at both ends are depressurized, and then the pressure-feeding tank outlet is Close the valve, open the valve at the input port provided on the pressure-feeding tank, input a predetermined amount of material such as cement milk or mortar from here, and insert the elastic body into the material input port from the sliding piston input device. A sliding piston that slides while sealing the inner wall of the transport pipe with its outer periphery is inserted between the valves at both ends of the sliding piston charging device, and as soon as a predetermined amount of material has been charged into the pressure tank, the air is released. Close the valve at the port and the valve at the inlet, then open the valve at the pressurized air inlet, supply pressurized air from here to the pressure tank, and force a predetermined amount of material into the transport pipe connected to the sliding piston inlet device. Next, close the valves on the transport pipe side of the valves at both ends of the sliding piston charging device, then open the air vent to reduce the pressure in the pressure tank, the measuring section, and the sliding piston charging device, and then Close the valve at the outlet of the pressure-feeding tank, introduce the material into the pressure-feeding tank from the input port, and at the same time close the valves connected to the measurement part of the valves at both ends of the sliding piston feeding device. Insert the sliding piston and push it between the valves at both ends, then supply pressurized air from the pressure air inlet on the pressure tank and open the valve at the outlet of the pressure tank and the valves at both ends of the sliding piston insertion device in order. A cement milk/mortar pumping method characterized by pumping a fixed amount of material into a transport pipe, repeating the above operations, and pumping the material and the sliding pistons before and after the material with pressurized air. 2. A pressure-feeding tank that is equipped with an input port for materials such as cement milk or mortar, a pressurized air inlet, and an air vent, and a measuring section that is connected to the pressure-feeding tank and has a flow meter installed in the middle. A sliding piston inserting device connected to the measuring section and inserting the sliding piston between the measuring section and the transport pipe; and a transport pipe connected to and extending from the sliding piston, the sliding piston comprising: A cement milk/mortar pumping device that is made of a compressible elastic material and slides while sealing the inner wall of a transport pipe at its outer periphery.