JPH03287925A - Device for conveying earth, sand and sludge under pressure - Google Patents

Abstract

PURPOSE:To smoothly convey under pressure by disposing a fine particle tank with an agitating device above a hopper and supplying, when earth and sand having low fluidity is supplied, fine particle sludge in said tank into the hopper to impart fluidity to said earth and sand. CONSTITUTION:There are provided a hopper 2 provided with a pressure transfer pump 1 and an agitating device 9, a fine particle tank 6 provided with a pressure transfer pipe line 5 and an agitating device 7, and a pipe line 10 etc. At the tank 6, fine particles of earth, sand and sludge supplied through a branch pipe 14 are stored and mixed with the water from a water feed line 12 to turn them into slurry. The earth, sand and sludge supplied into the hopper 2 are sent under pressure into the pipe line 5 by means of the pump 1. The earth, sand and sludge having high concentration which are difficult to transfer are detected by a viscometer 15 to open a valve 11, whereby the slurry is supplied from the tank 6 into the hopper 2 to impart fluidity to the earth, sand and sludge, which can be thereby smoothly conveyed under pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pressure feeding device for transporting earth, sand, sludge, etc. through a pipe.

[Conventional technology]

Conventionally, in addition to the belt conveyor system, pipe pressure pumping methods using dredger pumps, piston pumps, pneumatic pumps, etc. have been used to transfer soil and sludge dredged and lifted from river channels and ports. .

FIG. 5 shows an example of a configuration in the case of pipe pressure feeding using a pump.

1 is a pressure pump, 2 is a hopper, 3 is an agitation device, 4 is a screen, 5 is a pressure feed pipe, 12 is a water supply pipe, and 13 is a soil/sludge conduit. The earth, sand and sludge mixed with water by the stirring device 3 are pumped into the earth, sand and sludge conduit 13 by the pump 1.

[Invention is S? The task we are trying to solve]

(1) The belt conveyor system is highly versatile and can be applied to a wide range of objects to be transferred, but the permissible inclination angle of the conveyor is small for highly fluid sludge, making it difficult to respond to height differences. In addition, there are environmental problems such as falling from belts, adhesion to tiles, and diffusion of odors.

(2) The dredger pump method does not have the same problems as the belt conveyor method, but it is basically a hydraulic transport method, and it is necessary to add a large amount of water to the object to be transported (generally, the water content is 8.
(more than 5 scratches are required), treatment of mud after discharge to a landfill, prolonged solidification, drying shrinkage of mud, and other problems.

(3) Piston-type pumps and pneumatic pumps have almost no problems in (1) and (21) above, but when the material to be transferred is highly concentrated and has extremely low fluidity, or contains almost no particulate matter such as silt. With sand, etc. that cannot be used, the pumping resistance increases rapidly, causing problems such as difficulty in pumping and difficulty in pumping.

[Means to solve the problem]

In high-concentration pipe pumping using piston-type or pneumatic pumps, (1) fine particles such as silt are collected in a tank separate from the pump for fluidization and adjustment, and (2) is mostly When non-fluid soil or sand that contains almost all fine particles is supplied to the hopper of the pressure pump, the fine particle slurry stored in a separate tank is replenished into the hopper of the pressure pump. Mixes and stirs with soil, sand, etc. to increase the fluidity of the object to be forwarded.

[Effect]

When you add silt or other fluid particles to sand and sand that you want to have fluidity, or sand that contains almost no particulate matter, the particles get into the spaces between the large particles, causing earrings. Due to this action, relative movement between large-diameter particles becomes easy, and the barrel becomes fluid. The amount to be compensated is sufficient to be approximately 1,096 to 1,096 to the original pumped material, and a large amount is not required.

Therefore, when the pumping is going smoothly, some of the particles in the pumped material are separated into a separate particle tank, or the particulates can be separately supplied to the particle tank), and the concentration is adjusted and fluidized. Save it up.

If the content of the material to be pumped changes after that, and if extremely concentrated soil with no fluidity or sand that contains almost no fine particles is supplied, the pumping resistance will rapidly increase and pumping becomes difficult in the same method. If such a symptom occurs, the fine particles with a fluidity of about 10 to 10 times the amount of pumping are supplied from the above-mentioned particle tank to the hopper. By stirring and stirring, earth, sand, etc. that were previously difficult or impossible to pump will become fluid and can be pumped smoothly.

〔Example〕

In Fig. 1, 1 is a pump for pumping dirt and sludge, which is a piston type, and 101 is a pressure cylinder, and when the pump piston 102 retreats, the dirt and sludge accumulated in the hopper 2 are removed from the suction/discharge valve. The dirt and sludge are sucked into the pressure-feeding cylinder 101 via the pressure-feeding piston 104, and then pushed out into the pressure-feeding pipe 5 via the suction/discharge valve 104 by the advancement of the pressure-feeding piston 102, thereby performing the pressure-feeding of earth, sand, and sludge. Pressure feeding piston 1
02 is driven by a hydraulic cylinder 103. This mechanism is no different from conventionally known piston type concrete pumps. 3 is a stirring device installed in the hopper 2, which stirs the earth, sand, and sludge supplied to the hopper 2 through the earth, sand, and sludge conduit 13, and aims at crushing, homogenizing, and fluidizing the earth, sand, and sludge. 4 prevents large clay lumps and rock lumps contained in the earth, sand and sludge supplied by the Sukhnoon from entering the hopper 2.

6 is a particulate tank, which is a branch pipe 1 of the sediment/sludge pipe 13.
This is a tank that screens fine particles from the soil and sludge supplied through the water supply line 12 with a screen 8 and collects them. The particles in the particle tank 6 are mixed and stirred, and the concentration, viscosity, etc. of the particles are adjusted to form a slurry. The large-diameter particles and stones removed by the screen 8 are sent to the hopper 2 side of the pressure pump 1 by the chute 9.

The slurry composed of fine particles of earth, sand and sludge adjusted in the fine particle tank 6 is sent to the pressure pump 1 via a pipe 10.
is supplied into the hopper 2. The pulp 11 provided in the pipe line 10 controls the supply/stop and amount of slurry supplied from the particulate tank 6 to the hopper 2 . 15 measures the viscosity of the pumped material in the hopper 2 with a viscometer.

Next, the operation of this device will be explained.

Figure 3 shows the concentration-viscosity curve for one boat of sediment and sludge. From the same figure, it can be seen that as the concentration increases (=moisture content decreases), the viscosity rapidly increases (=pumping resistance increases or pumping performance deteriorates).

Also, the content ratio of sand increases (= grain size structure becomes coarser)
This tendency becomes more and more obvious, and eventually it becomes difficult to pump the material even with just a few temperature changes.

On the other hand, if the pumping movement is only for coarse particles (for example, only sand),
Particle quanta constitute a bridge (see Fig. 4(a)), and are difficult to cause mutual displacement, have almost no fluidity, and cause blockages in pipes.

Therefore, during normal pressure feeding, if highly concentrated earth, sand, sludge, or a large amount of sand is supplied, which causes difficulty in pumping or blockage as described above, the reading on the viscometer 15 installed in the hopper 2 will become high. If this happens, open the pulp 11 and mix and stir the slurry of fine particles from the fine particle tank 6 into the hopper 2 by a few percent to more than 10 percent of the amount fed into the hopper 2. In Figure 3, the properties change in the direction of the arrow, the pumping resistance suddenly decreases, and pumping becomes possible. In addition, even if there are many coarse particles that cause blockages, fine particles can get between large diameter particles (see Figure 4 (b)), which will cause fluidity due to the use of bearings, resulting in smooth flow. It will be possible to pump it to

Judgment about the supply of slurry from the particulate tank 6 is not limited to the indicated value of the viscometer 15 described above, but can also be determined by changes in the load pressure of the pressure pump or by visually checking the material to be pumped.

In the embodiment shown in FIG. 2, the pulp 11 shown in FIG.

Further, in the above embodiment, the pressure pump 1 is shown as a piston type pump, but the type of the pressure pump 1 is not particularly limited, and may of course be a squeeze type, an air pressure type, etc.

〔Effect of the invention〕

The earth, sand and sludge pumping device according to the present invention includes a hopper with a stirring device inside, a particulate tank placed above the hopper and equipped with a stirring device, a sediment and sludge conduit connected to the upper part of the hopper, and the earth and sand. - A branch pipe that branches from the sludge conduit and connects to the upper part of the particulate tank, a pipe line that connects the lower part of the particulate tank and the upper part of the hopper, a valve provided in the pipe line, and By including the pressure pump provided at the bottom, the following effects are achieved.

(1) If the earth, sand, or sludge supplied to the hopper is in a non-flowing state or is mostly sand, it will be difficult or impossible to pump it with a pressure pump, but in that case, fine particles should be prepared in advance. Replenish the hopper with slurry made of fine particles that has been adjusted and stored in the tank (replenishment amount ranges from several to 1 (l)
By stirring and mixing with a stirring device, earth and sand that had no fluidity become fluid and can be pumped smoothly.

(2) What was conventionally difficult or impossible to pump can now be pumped at low cost with an extremely simple device as described above and without the need for special materials such as a fluidizing agent.

[Brief explanation of drawings]

Figures 1 and 2 show configuration diagrams in an embodiment of the present invention, and Figure 3 shows the concentration of soil and sludge relative to the sand content ratio.
The viscosity curve is shown. FIGS. 4(a) and 4(b) each show the configuration of sand particles. FIG. 5 shows the configuration of a conventional pressure pump. 1...Pressure pump 201. Hopper 3... Stirring W
Equipment fl 6-・Particle tank 7... Stirring device 1o... Pipe line 11 ・Pulp
13... Sediment/sludge pipe 14... Branch pipe

Claims (1)

[Claims] A hopper with a built-in agitation device, a particulate tank placed above the hopper and with a built-in agitation device, a sediment/sludge conduit connected to the upper part of the hopper, and a particulate tank branched from the sediment/sludge conduit. a branch pipe connected to the upper part, a pipe line connecting the lower part of the particulate tank and the upper part of the hopper, and a valve provided in the pipe line;
A device for pumping earth and sludge, comprising a pressure pump provided at the bottom of the hopper.