JPH0339527A - Dredging device - Google Patents

Abstract

PURPOSE:To make inexpensive and efficient dredging practicable by providing a sludge-lifting screw that conveys sludge taken into a sludge take-in part to a pump for forcible conveyance of the sludge and also by providing, through a check valve, a compressed air injection pipe on the discharge side of the pump. CONSTITUTION:A plurality of conical, trapezoid rollers 1 are driven at high speed by roller-driving prime movers 2 and, at the same time, a sludge-lifting screw 3 is driven by a main prime mover 5 together with a volute pump 4. Rubbish such as sunken logs and the like are expelled by the rollers and are swept away toward the upper side of a sludge take-in part A, allowing only the sludges S to flow into the sludge take-in part A through slits H. The taken-in sludge is then led to the pump 4 by means of the screw 3 and is sucked and agitated therein and is further conveyed forcibly therefrom being mixed with compressed air (a) that is discharged from a compressed air injection pipe 19 behind a check valve 21.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a dredging system used mainly in dam lakes and the like to dredge only earth and sand from places where there is a lot of railroad ties and other garbage in the earth and sand accumulated on the lake bed. It is related to the device.

[Conventional technology]

Conventionally, when dredging the bottom of a lake such as a dam lake as mentioned above, the garbage in the dredging area is removed in advance with a garbage removal device, and therefore, in addition to the dredging device, a dedicated garbage removal device is required. , there is a problem that two types of work are to be performed, which is time consuming and costly, and is extremely uneconomical.

[Purpose of the invention]

The present invention was made to solve the above-mentioned conventional problems, and uses only a dredging device without using a garbage removal device to remove garbage during dredging and send only earth and sand to a pump. The object of the present invention is to provide a dredging device that can economically and efficiently dredge earth and sand at the bottom of a water body.

[Summary of the invention]

To achieve the above object, the dredging device of the present invention has spiral protrusions or grooves formed on its surface, and a plurality of truncated conical rollers rotating at high speed, each with a predetermined gap through which only earth and sand can pass. a cylindrical earth and sand intake section, a mud lifting screw section that introduces the earth and sand in the earth and sand intake section into the suction section of the pump for pumping the earth and sand, and a pressurizing impeller or volute that pumps the earth and sand. The dredging equipment consists of a pump for pumping sand, etc., and a compressed air injection pipe installed through a check valve on the discharge side of the pump for pumping sand. It is attached to the tip of a swingable ladder and buried in the sand at the bottom of the water.
By driving from the barge, only the earth and sand are introduced into the earth and sand intake section through the gaps between the truncated conical rollers that rotate at high speed, and the earth and sand are introduced into the pump by the mud pumping screw and discharged through the pressure pipe. It will be sent. Furthermore, if the inner body of the earth and sand intake section is also rotated and a plurality of blades are arranged in the earth and sand intake section, earth and sand can be gathered up by the blades.

〔Example〕

The present invention will be described in detail below with reference to the drawings.
The figure is a partially sectional side view of the dredging device in Embodiment 1 of the present invention, FIG. 2 is a plan sectional view showing the arrangement of the truncated conical rollers in FIG. A perspective view of a platform roller, FIG. 4 is a side view of a dredging barge equipped with the dredging device shown in FIG. 1, FIG. 5 is a plan view of FIG. 4, and FIG. 6 is a second embodiment of the present invention. Partial cross-sectional side view of the dredging device, Figure 7-A,
Fig. 7-B and Fig. 7-C are side sectional views showing the situation in which earth and sand are pumped through the pumping pipe.

First of all, this dredging device has an earth and sand intake section A shown in Fig. 1,
It consists of a mud pumping screw part B that introduces the earth and sand from above into the suction part of the centrifugal pump 4 driven by the main motor 5 at the top, as shown in Figs. 4 and 5. , this dredging device 12 is installed at the bottom of the barge 11 on the water surface,
It is attached to the tip of a ladder 13 that is swingable toward the water bottom, and is operated from the barge 11 while vertically buried in the soil S on the water bottom of the dredging area.
is introduced into the earth and sand intake part A, and further suctioned by the centrifugal pump 4 via the mud pumping screw part B, and compressed air a is injected from the compressed air injection pipe 19 through the check valve 21. 13 and a pressure feed pipe 10 on a float 17 to discharge the waste to a disposal site.

In addition, this dredging device 12 can be used to move barge ll from position X on the water bottom as shown in FIG.
It can be salvaged as shown in position Y above, and during dredging work, in order to prevent the spread of water pollution, it is surrounded by a submerged pollution diffusion prevention curtain 16 suspended from a buoy 15 above the water surface. I have to.

Next, as shown in FIG. 3, the earth and sand intake section A of this dredging device 12 has spiral protrusions 6 formed on its outer circumferential surface, and has a plurality of spiral protrusions 6 that are simultaneously rotated at high speed by a roller drive prime mover 2 such as a hydraulic motor. As shown in FIG. 2, truncated conical rollers 1 are arranged in a cylindrical shape with a predetermined gap H between them so that only the earth and sand S can pass through.
A mud pumping screw 3 in a mud pumping screw part B that introduces earth and sand S into the centrifugal pump 4 from above is rotated together with the centrifugal pump 4 by a main motor 5.

As described above, a plurality of truncated conical rollers l are arranged at a predetermined gap H.
By arranging it in a cylindrical shape with
It also has a truncated conical shape, which makes it easy to be buried in the sediment S sampling area at the bottom of the water.

In addition, in FIG. 1, 8 is a ladder mounting portion.

Further, in this embodiment, the spiral protrusion 6 is formed on the surface of the truncated conical roller 1;
Alternatively, spiral grooves may be provided on the surface.

In the dredging device 12 of the present invention having the above configuration, a plurality of truncated conical rollers l that rotate at high speed are arranged in the shape of an inverted truncated cone in the earth and sand intake section A, and a spiral is formed on the surface of each truncated conical roller 1. Since the protrusion 6 is provided, debris such as sleepers is thrown away by the truncated conical opening 1 that rotates at high speed and is removed upwards to the soil intake section, and only the soil S is taken in through the predetermined gap H. It flows into the section A, is further sent by the pumping screw 3, is suctioned and stirred by the centrifugal pump 4, the soil S is disturbed and its strength is reduced, and the compressed air a is sent from the compressed air injection pipe 19 to the check valve 21.
It is mixed in and pumped through.

When the compressed air a is discharged into the pressure feed pipe 10, initially the seventh
As shown in Figure A, earth and sand S is sent to the lower part of the pipe, and compressed air a is sent to the upper part of the pipe. Subsequently, as shown in Fig. 7-B, the surface of the earth and sand S becomes rippled, and finally, as shown in Fig. 7-C, the earth and sand S blocks the inside of the pipe and becomes plugged.

After this state continues for a while, the state returns to the state shown in Fig. 7-A, and the earth and sand S is pumped while repeating the states shown in Figs. 7-A to 7-C.

When the earth and sand S becomes plugged in the pipe, the resistance increases and the compressed air a tries to flow backwards instead of going in the direction of pumping the earth and sand S, but since the check valve 21 closes, the backward flow of the compressed air a is prevented. At the same time, the supply of soil S is also interrupted. When the state in which the earth and sand S is plugged into the pipe collapses, the resistance decreases and the compressed air a flows more easily in the direction in which the earth and sand S is pumped, so the check valve 21 opens and the earth and sand S is supplied.

Thus, in the present invention, it is important to receive the compressed air injection pipe through the check valve.

Note that when dredging is completed to a predetermined depth, the dredging device 12 is once lifted from the water bottom and moved to the next location.

Further, since this dredging device 12 is mainly used for dredging the bottom of a dam lake or the like, and its purpose is to remove accumulated earth and sand S, there is no need to flatten the excavation site.

Next, the dredging device 12 of the second embodiment shown in FIG. 6 has substantially the same configuration and function as the first embodiment shown in FIG. 1, and the same parts are indicated by the same part numbers.

Therefore, in this second embodiment, each of the truncated conical rollers l, which are arranged in a truncated conical shape as a whole, is driven by distributing hydraulic pressure via hydraulic piping (not shown) through a swivel joint. The earth and sand intake section A itself is rotated as shown by arrow R by a pinion provided on the motor 22 and a rack. Since a plurality of blades 18 are arranged radially in A, the earth and sand S
can be scraped up by the blade 8, and the efficiency of taking in the soil S is improved.

Furthermore, as a pump for pumping the earth and sand S, a pump 20 with a screw centrifugal impeller suitable for pumping high concentration liquid is used to increase pumping efficiency.

〔Effect of the invention〕

As explained above, if the device of the present invention is adopted, the truncated conical roller that rotates at high speed in the sediment intake section can remove garbage and take in only the sediment, while fluidizing the sediment. It is no longer necessary to perform garbage removal work using a garbage removal device before dredging, and it becomes possible to dredge areas with a lot of garbage using only the device of the present invention, and therefore, economical and efficient dredging work can be performed. effective.

In addition, since the compressed air injection pipe is installed via a check valve, the compressed air does not flow backwards toward the earth and sand pump, and the earth and sand air pump only sends earth and sand into the air supply pipe, so its capacity is small. It also has the advantage of being able to transport materials over long distances under pressure.

[Brief explanation of drawings]

1 is a partially sectional side view of a dredging device in Embodiment 1 of the present invention, FIG. 2 is a plan sectional view showing the arrangement of the truncated conical rollers in FIG. 1, and FIG. FIG. 4 is a side view of a dredging barge equipped with the dredging device shown in FIG. 1, FIG. 5 is a plan view of FIG. 4, and FIG. 6 is a diagram showing the implementation of the present invention. Partial cross-sectional side view of the dredging device of Example 2, No. 7-A
7-B and 7-C are side sectional views showing the situation in which earth and sand are pumped through the pumping pipe. 1... truncated conical roller, 3... mud lifting screw, 4
...Spiral pump, 6...Spiral protrusion, 12...
・Dredging equipment, 19... Compressed air injection pipe, 20... Pump with screw centrifugal impeller, 21... Check valve, A...
- Sediment intake part, B... mud lifting screw part, H... predetermined gap, S... earth and sand.

Claims (1)

[Scope of Claims] 1. An earth and sand intake section in which a plurality of truncated conical rollers having spiral protrusions or grooves formed on the surface and rotating at high speed are arranged in a cylindrical shape at predetermined intervals, respectively; a mud pumping screw part that introduces the earth and sand in the earth and sand intake part into a pump for pumping earth and sand;
A dredging device consisting of a compressed air injection pipe installed via a check valve on the discharge side of a pump for pumping earth and sand. 2. The dredging device according to claim 1, wherein the earth and sand intake section itself also rotates, and a plurality of blades are arranged in the earth and sand intake section.