JPH03244716A - Dredge system - Google Patents

Abstract

PURPOSE:To miniaturize a dredge system and reduce the time required for disposal and the cost of construction by providing a dredge system with a pump dredging device, a classifying and muddy water disposing device and a sand discharge pipe, and discharging upper clear water using the classifying and muddy water disposing device, and conveying the fixed part of sediment onto the ground using a water dump truck. CONSTITUTION:Sediment is excavated by a pump dredging device 1 and muddy water is absorbed and fed into a classifying device 3-1 and a classifying and dewatering device 3-2 via a sand discharge pipe 2. The sediment is then classified into sand and gravel and only the muddy water is forcibly fed into a sedimentation vessel device 4 and upper clear water is discharged to a lake and water with sludge condensed and settled is forcibly fed into a dewatering cake device 5. After the water with sludge is compressed, the water with sludge is classified into water and a cake of earth and sand and water pressed out of the cake is returned to the sedimentation vessel device 4. The sand and gravel classified by the classifying device 3-1 and the classifying and dewatering device 3-2 and a sand cake taken out by the dewatering cake device 5 are loaded on a water dump truck 6 and conveyed to a landing wharf on the bank of the lake and used as aggregate or soil etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to systems related to dredging, classification, and turbid water treatment products, particularly for use in dams, lakes, and rivers.

[Conventional technology]

The equipment for dredging sediment from dams is an offshore pump dredger divided into blocks that can be transported by road, and although it is an assembly type, the basic structure and function remain the same.

From the rear of the pump dredger, sand, gravel, and dewatered cake (silt and viscous The water is separated into (solid content of soil) and supernatant water, and the supernatant water is discharged (returned) to the lake.

Figure 4 shows an example of dredging equipment for lakes and rivers. That is, the pump dredging device...1 floats on a lake or river and includes a long-distance (for example, 2000 mu) sand discharge pipe...2. The land base has a classification device...3-1, a classification dehydration device...
・3-2, Sedimentation tank device...4, and dehydrated cake device 5
Place.

The difference between dredging in the sea and in lakes is that in oceans and wide-area lakes, there is no flow, but in the upper reaches of lakes, they become rivers and must be dredged even under conditions with flows. Where there is a flow, sand and gravel with relatively high specific gravity are deposited, while silt and clay soil with low specific gravity tend to float and flow downstream, where they are deposited on the lake bed.

[Problem to be solved by the invention]

The above-mentioned conventional technology has the following problems.

Since the sand discharge pipe placed on the 70-toe tends to flow downstream due to running water, it is necessary to insert a sinker block (for sinking conch/note blocks) and tie it to the sand discharge pipe with a wire chain, etc. to secure it. Kaa・ko.

Additionally, when there is heavy rainfall in mountainous areas, rivers can swell and flow quickly, causing driftwood to hit and damage the sand pipes. My father lifts the bookstand by pulling it into the sand pipe.

For this reason, it is necessary to collect and restore the original VC1 sand pipe in advance, so there is a risk of increasing the opening before construction or delaying the construction period.

In addition, a great deal of time and effort will be required for land classification, securing intermediate land for the water treatment equipment, and basic construction.

The present invention eliminates the above-mentioned steel points and pumps and L in flowing water areas.
The purpose of the present invention is to provide a multi-purpose nine-pole system that can collect algae that occurs on the surface of the lake.

[Means to solve the problem]

(1) In order to carry out pump dredging in the catchment area, the sand discharge pipe should be kept as short as possible.

(2) A device for dehydrating and treating dredged turbid water will be placed on a barge.

(3) Transport the classified gravel and dehydrated cake to the riverbank using a large water dump boat.

(4) A floating pier, hopper, and conveyor will be placed on the riverbank to enable the transportation of gravel, etc. to land even when the water level changes.

5) In the event of a flood, the entire system can be evacuated to the surface of a wide lake.

+6+ ears pump's suction mouse to blue-green algae (
(which grows within a range of about 2m from the water surface) can be effectively sucked.

[For production]

(1) By shortening the sand discharge pipe from, for example, 2000 m to about 100 m, the discharge pressure loss can be significantly reduced, so the dredging pump can be downsized.

[2+ Evacuation and recovery in the event of flooding can be done in an extremely short time compared to the new long-distance sand pipe system.

(3; By combining a dredging device and a turbid water treatment device, and using the suction mouth of the dredging device for use in shallow water over a wide area,
You can get rid of it by suctioning and collecting the blue-green algae.

(4) Sand and gravel materials that have been sorted on the lake cannot be transported by floating dump truck, whether for use or downstream.

〔Example〕

FIG. 1 shows the concept of an embodiment of the present invention, and is a 9+ perspective view of a dredging state. Pump dredging device...l excavates the accumulated earth, sucks in turbid water, passes through sand discharge pipe...2, classifier...3-1, classification dewatering device...
The water is sent to 3-2, classified into sand and gravel, and only the turbid water is sent under pressure to the sedimentation device...4. This sedimentation tank device 4 inputs chemicals (harmless chemicals such as polyaluminum chloride), condenses and settles suspended solids (silt and clay particles that cause turbid water), and supernatant water is discharged into the lake. The condensed and settled sludge water is sent under pressure to a dewatering cake device 5.

Here, sludge water is compressed using a filter press or the like, and then classified into water and sediment cake. Since the squeezed water is turbid, it is returned to the settling device...4 again.

The sand and gravel that have been sorted by the classification device...3-1 and the classification/dehydration device...3-2, as well as the earth and sand cake taken out by the dewatering cake device...5, are loaded into the floating dump truck...6. It is then transported to the unloading quay on the riverbank and used as aggregate (sand and gravel), field soil, and reclaimed soil.

Figure 2 shows an example of dredging work using the equipment shown in Figure 1.

The technical details are the same as in Figure 1, so they are omitted. 8 is a floating pier, 9 is a conveyor, and 10 is a dump truck.

FIG. 3 shows an example of blue-green algae collection using the apparatus shown in FIG. 1. A special suction mouth 7 is attached near the water surface to the pump dredging device 1 to effectively suction algae. Classification device...3-1 and classification dehydration device...
・Do not incorporate 3-2 into the fleet, connect directly to the dehydration cake device...5, compress and solidify the blue-green algae, and then collect it.

〔Effect of the invention〕

The dredging system according to the present invention includes a pump dredging device that can move on the water surface, a classification/turbid water treatment device installed on a barge,
A sand discharge pipe is provided to feed the turbid water of water and sediment from the pump dredging device to the classification/turbid water treatment device, and the top water is discharged from the classification/turbid water treatment device to remove sand, gravel, and dehydrated cake base. By configuring the fixed portion to be transported to land using a floating dump truck, the following effects are achieved.

(1) The dredging pump can be made smaller because the sand discharge pipe can be shortened and the discharge pressure drop can be reduced to a large value.

(21 By shortening the sand removal pipe, evacuation and recovery in the event of a flood can be done in an extremely short time compared to a long-distance sand removal pipe system.

(3) There is no need for a site for classification or turbid water treatment equipment on the riverbank, and foundation work can be omitted.

(4) According to items (1) to (3) above, it is classified as J on land.
Compared to the conventional method of constructing a P turbid water treatment facility and installing long-distance sand removal pipes, construction costs can be reduced.

(5) When blue-green algae occurs in the summer and there is a risk of flooding, it is possible to collect blue-green algae on the surface of a lake with a slow flow, and to dredge in a place with a current when there is no risk of flooding. Since it can be used for multiple purposes, by increasing the operating rate throughout the year, it is possible to significantly reduce costs overall without introducing different equipment.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an outline of an actual flight example of the present invention, Fig. 2 is a schematic side view showing an example of dredging construction using the apparatus shown in Fig. 1, and Fig.
The figure is a schematic side view showing an example of collecting algae using the device shown in FIG. 1, and FIG. 4 is a perspective view showing an outline of a conventional dredging pump device. 1... Pump ei device 2... Sand discharge pipe 31... Classifying device 3-2... Classifying and dehydrating device 4... Sinking tank device 5... Dewatering cake device 6... Floating dump

Claims (1)

[Claims] A pump dredging device that can move on the water surface, a classification and turbid water treatment device installed on a barge, and a sand discharge pipe that feeds the turbid water of water and sand from the pump dredging device to the classification and turbid water treatment device, The supernatant water is discharged from the classification and turbid water treatment equipment, and sand,
A dredging system characterized by being configured to transport fixed portions of gravel, dewatered cake, etc. to land using a floating dump truck.