JP2001348905A - Method of gathering soil and sand by dredger and its dredger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively utilize soil and sand while selecting soil and sand on a dredger. SOLUTION: A selecting net for a selector M on the dredger S is installed at a plurality of stages 2a, 2b, the selected grain size is reduced gradually towards the lower stage, and the selected soil and sand are recovered by chutes 3, 12, 15 respectively. When the gathered soil and sand are selected previously, they are of advantage to post-treatment. When sucked-up soil and sand are all recovered in this case, soil and sand are utilized effectively while the increase of the turbidity of an underwater section can be inhibited by disused soil and sand. The selected soil and sand are forwarded into a pit in the dredger and recovery boats 13, 14 in both neighbors of the dredger by each chute 3, 12, 15. The chutes 12, 15 are bent freely.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for collecting sediment deposited on the bottom of a sea, a river, a lake, a dam, or the like with a dredger, and a dredger.

[0002]

2. Description of the Related Art As a method for collecting sediment deposited on the bottom of the water such as the sea, rivers, lakes, marshes and dams, for example, in the sea,
As shown in FIG. 4, a discharge pipe (suction pipe) P having a sediment-collecting submersible pump A attached at the tip from a ship S is sent into the sea via a wire W, and the sediment-collecting submersible pump A is made to correspond to the water depth. Generally, there is a method of guiding to the seabed G and sucking up the earth and sand on the ship by suction. In this method,
Sediment pumped from the submersible pump A for sediment collection
It is sent to the earth and sand sorting device M by the suction pipe P and sorted.

Referring to FIGS. 1 (a) and 1 (b), the sorting apparatus M is provided with a sorting network 2 in a sorting machine 1 provided on a frame F on a boat deck, and The earth and sand is sent from the suction pipe P to the upper part and flows on the sorting net 2, and the earth and sand of a required size is dropped downward from the mesh, sent into the pit 4 on the ship from the chute 3, and is sorted by the sorting net 2. Dispose of the missing earth and sand into the sea.

[0004]

When the conventional dredging ship S collects sediment, the sediment having a required size or less is collected, and the sediment is not further sorted into the respective sizes. This is because sorting was performed by on-shore post-processing, but sorting at each particle size of the soil at the time of dredging has come to be required.

[0005] Some of the earth and sand that has been discharged into the sea or the like can be sufficiently used as a construction material.

An object of the present invention is to make effective use of earth and sand and to enable the earth and sand to be sorted on a dredger.

[0007]

In order to solve the above-mentioned problems, the present invention is to provide a sorting network of a sorting machine on the dredger in a plurality of stages, and the size of the sorting particles gradually decreases toward the lower stage. In this way, the sediment was collected separately. If the collected sediment is sorted, it is advantageous for post-treatment.

At this time, the sediment discharged from the first stage sorting may be returned to the sea or the like, as in the prior art. However, if all the sucked sediment is recovered, the effective utilization of the sediment can be achieved. The turbidity in water can be prevented from increasing due to the discarded earth and sand. In addition, sediment removed from the conventional sorting includes gravel having a large particle size. The large-size gravel can be used as construction material.
For this reason, by collecting all the sediment collected,
A new source of the gravel can be secured.

More specifically, in a method for collecting sediment from a water bottom by sucking up sediment at the bottom of the water on a dredge ship and flowing the sediment toward a sorting net in a sorter on a shipboard deck to sort soil having a predetermined particle size or less, The sorting screen is provided in a plurality of stages so that the sorting particle size gradually decreases toward the lower stage,
A configuration is adopted in which the sediment sorted by each sorting net is separately collected.

[0010] In this configuration, if one of the above-mentioned selected sediments is sent to a collecting vessel adjacent to the dredging vessel, in particular, a large amount of collected soil can greatly reduce the amount of collected soil by one dredging. Can be raised. This is because, as in the conventional case, if the sediment storage space is only a dredger, the dredging operation is completed when the space becomes full.

Further, in this configuration, the sediment is sucked up from an opening communicating with the bottom of a part of the hull of the dredger, and another of the selected sediment is placed on the opposite side of the dredger adjacent to the recovery ship. If it is sent to an adjacent recovery ship, the above-mentioned amount of collection is further increased. At this time,
Even if there is a recovery vessel on both sides of the hull, there is no hindrance to the dredging work because the soil is sucked up from the opening of a part of the hull.

[0012] As a ship for performing the above-mentioned dredging, sediment at the bottom of the water is sucked up by a submersible pump for sediment collection, and the sediment is flown toward a sorting net in a sorting machine on a shipboard deck to sort and collect soil having a predetermined particle size or less. In the dredger, the sorting net is provided in a plurality of stages so that the sorting particle diameter gradually decreases toward the lower stage, and chutes for individually transporting the sediment sorted by the respective sorting nets are provided,
It is preferable that an opening is provided in a part of the hull for lowering the underwater pump for collecting soil and sand to the bottom of the water. At this time, of the chutes, those that protrude to the side of the hull may be raised and lowered on the way to fit within the hull width.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION One embodiment of the method for collecting earth and sand according to the present invention is to suck up the earth and sand at the bottom of a sea, a river, a lake, a dam or the like, and to flow the earth and sand toward a sorting net to obtain two types of predetermined soil. Sorted into soil having a particle size of less than or equal to the particle size, and the above sorted soil (hereinafter referred to as “sorted sand”) is collected.
By collecting the sediment removed from the above-mentioned sorting (hereinafter, referred to as “sorted outside sand”), all of the sucked earth and sand is collected.

In this embodiment, FIGS. 1 (a) and (b) and FIGS.
As shown in FIG. 1, a dredger S is used which sucks up the sediment at the bottom of the water by a submersible pump A for sediment collection, flows the sediment toward a sorting net 2, and sorts and collects soil having a predetermined particle size or less. The method of sucking up the sediment on the bottom of the water is not particularly limited, and a method of lowering the submersible pump A and the discharge pipe (suction pipe) P for collecting soil and sand on the side surface of the dredger S as shown in FIG. Further, as shown in FIGS. 1 (a) and 1 (b), an opening 11 for lowering the above-described submersible pump A for sediment collection may be provided in a part of the hull of the dredger S for sucking sediment from the bottom of the water. Good. The position of the hull in which the opening 11 is provided is not particularly limited, and may be, for example, a ship bottom or a stern as shown in FIGS. 1 and 2.

As shown in FIG. 2, a submersible pump A and a discharge pipe (suction pipe) P for collecting earth and sand are lowered from the opening 11. That is, when the submersible pump A is not used,
It is placed on the board D of the shipboard deck as shown by the solid line in the figure, and when in use (during dredging work), it is lifted above the opening 11 as shown by the chain line in the figure, and then rises and falls as shown by the arrow, and is submerged. A
Into and out of the water. This opening 11
The two sides of the dredger S can be opened by taking in and out the pump A from.

The dredger S has an apparatus M for sorting sucked earth and sand. The sorting device M is provided with a two-stage sorting net 2a, a sorting net 2a in a sorting machine 1 provided on a frame F on a shipboard deck.
b (generic symbol 2). The sediment is sent from the suction pipe P to the upper part of the sorting net 2a and flows over the sorting nets 2a and 2b. The required size of the sediment is dropped from the mesh sequentially and collected from the chutes 15 and 3. 14 and the pit 4 on the ship, and the chute 12 discharges the sorted outside earth and sand that has not been sorted by the sorting net 2a.

The screens 2a and 2b are such that the mesh of the lower stage 2b is set smaller than that of the upper stage 2a.
The sediment sent on the a is sequentially sorted to a required particle size or less according to the difference in the mesh, and the sediment sorted by the first net 2a is sorted by the chute 15 and the second net 2b. The sediment is sent to the chute 3 respectively. The number of stages of the sorting net is arbitrary, three or more, and chutes 15, 3,... Are provided according to the number of stages. The particle size at the final stage is preferably 2 mmφ or less.

The sorted outside soil discharged from the chute 12 is collected by a first collection ship 13 adjacent to the dredge S as shown in FIG. At this time, it is preferable that the chute 12 can be bent in the middle. By doing so, when the chute 12 is not used, the chute 12 is folded to fit within the width of the dredger S, and when the chute 12 is used, the tip of the chute 12 is placed outside the side surface of the dredge S. This is because it can be extended to the position above the first recovery boat 13.

The first-stage sorted earth and sand from the chute 15 is sent to and collected by a second collection boat 14 adjacent to the dredger S and on the opposite side of the first collection boat 13 and collected from the chute 3. Of the second stage is sent to pit 3 and collected. It is preferable that the chute 15 is also bendable in the middle.

As described above, when the recovery method using the first recovery boat 13 and the second recovery boat 14 is adopted, the above-mentioned dredger S, that is, as shown in FIGS. Partly, a dredger S provided with an opening 11 for lowering the submersible pump for sediment collection is used.

When the pit 4 is divided into a plurality of sections, a chute of each sorting stage is provided in accordance with each section, so that each sorting can be performed without using the first collecting boat 13 and the second collecting boat 14. Soil and sediment can be collected and collected.

[0022]

According to the present invention, the sucked earth and sand is sorted into a plurality of particle size groups on the ship, so that the earth and sand can be effectively used and post-processing is also convenient.

Further, in the case where the sorted earth and sand is collected by the collecting ship, the earth and sand can be continuously collected without being affected by the size of the pit of the dredger.

[Brief description of the drawings]

1A is a partially enlarged front view showing an example of a dredger according to the present invention, and FIG. 1B is a plan view of FIG.

FIG. 2 is a submersible pump for sediment collection of the dredger of FIG. 1 (a);
Partial sectional view showing an example of a discharge pipe (suction pipe) and an opening.

FIG. 3 is an operation diagram showing the operation of the chute of the dredger of FIG. 1 (a).

FIG. 4 is a perspective view showing an example of a dredger.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sorting machine 2, 2a, 2b Sorting net 3 Chute 11 Opening 12 Chute 13 First recovery boat 14 Second recovery boat 15 Chute A Submersible pump for collecting soil and sand F Frame M Sorting device P Discharge pipe (suction pipe) S Dredger

Claims (5)

[Claims] 1. A method for collecting sediment from a water bottom by drawing up sediment on the bottom of a water on a dredger and flowing the sediment toward a separatory net in a separator on a shipboard deck to select sediment having a predetermined particle size or less. A method of collecting sediment by a dredging ship, wherein the sediment is provided in a plurality of stages such that the sorted particle diameter gradually decreases toward the lower stage, and the sediment sorted by each sorting net is separately collected. 2. The method according to claim 1, wherein one of the selected soils is sent to a recovery vessel adjacent to the dredging vessel. 3. A dredger, wherein the sediment is sucked up from an opening communicating with a bottom of a part of the hull of the dredger, and another of the selected sediments is collected adjacent to an opposite side of the dredger adjacent to the collecting boat. The method for collecting sediment using a dredging vessel according to claim 2, wherein the method is adapted to be sent to a ship. 4. A dredging vessel for sucking up sediment at the bottom of a water with a submersible pump for sediment collection and flowing the sediment toward a sorting net in a sorting machine on a shipboard deck to sort and extract soil having a predetermined particle size or less. Are provided in a plurality of stages so that the sorted particle diameter gradually decreases toward the lower stage, and chutes for separately transporting the sediment sorted by the respective sorting nets are provided. A dredging vessel provided with an opening for lowering a sampling submersible pump to the bottom of the water. 5. The dredging vessel according to claim 4, wherein, among the chutes, those protruding to the side of the hull are adapted to be able to undulate and fit within the hull width in the middle thereof.