Narrow water area dredge system and method

Abstract

To provide a narrow water area dredge system and method which can simply dredge a narrow water area, for example, a narrow river and canal, without causing deterioration of environment and expansion of contamination.SOLUTION: A narrow water area dredge system that can float and move on the water has: a solidified mud container mounting part 0201 for mounting a solidified mud container 0203 for mixing a modifier P with dredge mud and modifying the dredge mud; a mixer 0220 for mixing the dredge mud carried into the solidified mud container 0203 with the modifier P to form solidified mud (cone index of 200 kN / m2 or more); a transportation tool mounting part 0202 for mounting a transportation tool 0205 for transporting the solidified mud in the solidified mud container 0201; and a solidified mud mover for putting the solidified mud into the transportation tool 0205 mounted on the transportation tool mounting part 0202.SELECTED DRAWING: Figure 2A

Description

[Technical field]

[0001] The present invention relates to a dredging system used to dredge mud that has accumulated on the bottom of water areas such as rivers, canals, bays, and reservoirs, and to modify the dredged mud generated during the dredging process so that it can be reused, for example, as construction materials (construction generated soil).The present invention relates to a dredging system for narrow water areas that is particularly suitable for use in narrow water areas such as narrow rivers and small reservoirs. [Background technology]

[0002] Traditionally, mud deposited at the bottom of water bodies such as rivers, canals, bays, and reservoirs has been dredged in order to remove causes of flooding, inundation, and environmental degradation, and to improve water quality. Most of the dredged mud collected from the bottom of water bodies can be recycled, and so in recent years it has become common to reuse dredged mud, for example, as construction waste soil or aggregate (material used to make concrete and asphalt mixtures). In this case, the dredged mud collected from the bottom of the body of water contains a large amount of water and is difficult to use as is, so the dredged mud is treated, for example, by solidifying it with a soil modifier.

[0003] Conventionally, an example of a dredging system that dredges mud that accumulates at the bottom of water bodies such as rivers and reservoirs, and performs modification processing such as solidifying the dredged mud generated during dredging, is the mud treatment device described in Patent Document 1.

[0004] The mud treatment device described in Patent Document 1 comprises a dredger, a backhoe mounted on the dredger to dredge soil and mud from the bottom of the body of water and scoop it up onto the dredger, a mud treatment device mounted on the dredger to mix the dredged mud scooped up by the backhoe with a solidifying agent, and a pump that pressure-transports the fluid mud mixed with the solidifying agent through a pipe extended toward its destination. This mud treatment device mixes the dredged mud with a solidifying agent on board the dredger ship, which eliminates the need to install solidifying agent mixing facilities on land surrounding water bodies such as rivers and reservoirs, thereby reducing equipment costs on land. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 04-187299 Summary of the Invention [Problem to be solved by the invention]

[0006] However, although the above-mentioned conventional mud treatment apparatus can reduce the cost of facilities on land, there is still a problem that the pumping equipment and pumping pipes for pumping the fluid mud to land are costly. In addition, the mud pumped by the pump still contains a lot of water even though it is mixed with a solidifying agent, so there is a possibility that the mud receiving side on land will be contaminated by the fluid mud. This is particularly problematic when soil surveys of the mud have not been conducted, and there is a problem that it may lead to environmental deterioration and the spread of pollution, and solving this problem has been a conventional task.

[0007] The present invention has been made to solve the above-mentioned problems of the conventional art, and aims to provide a system and method for dredging narrow water areas that can easily dredge narrow water areas, such as narrow rivers and canals, without causing environmental deterioration or increased pollution. [Means for solving the problem]

[0008] In order to solve the above problems, the present invention provides the following narrow water area dredging system. That is, the first aspect of the present invention is a solidification mud container mounting section for mounting a solidification mud container for mixing a modifier with dredged mud to modify the dredged mud, and a solidification mud container for mixing the dredged mud carried into the solidification mud container with a modifier to produce solidified mud (with a cone index of 200 kN / m 2 The solidified mud container is configured to be capable of floating and moving on the water and includes a mixer (such as the above), a carrier mounting section for mounting carriers such as sandbags for transporting the solidified mud in the solidified mud container, and a solidified mud mover for putting the solidified mud into the carrier mounted on the carrier mounting section.

[0009] In a second aspect of the present invention, the floating is achieved by a float assembly that can be assembled to any size by combining a plurality of float plates.

[0010] Furthermore, a third aspect of the present invention is configured to have a rope winding / releasing mechanism for achieving the floating movement using a rope fixed to the ground facing the water body.

[0011] Furthermore, a fourth aspect of the present invention is configured to further include a dredger having a function of scooping up mud and depositing the scooped dredged mud into a solidified mud container.

[0012] Furthermore, in a fifth aspect of the present invention, the dredger is configured to have a pair of floating crawlers for movement, and a gap adjustment unit for adjusting the gap between the pair of floating crawlers.

[0013] Furthermore, a sixth aspect of the present invention is configured to further include a water flow device that, when the channel height is restricted to between 1.5 meters and 3 meters by a tunnel, bridge, or other structure in a narrow water area, enters the waterway and uses a water flow to move mud from that area to another water area where the channel height is greater than 3 meters or there is no restriction on the channel height.

[0014] Furthermore, a seventh aspect of the present invention is configured to include a classification device for removing garbage mixed in the solidified mud.

[0015] On the other hand, the dredging method for narrow water areas according to an eighth aspect of the present invention includes a preparation step of preparing the narrow water area dredging system described in claim 1 in the water area, a mud scooping step of scooping mud from the water area, a modification step of mixing the dredged mud scooped in the mud scooping step with a modifier in a solidification mud container of the narrow water area dredging system using a mixer to form solidified mud, a solidified mud storage step of storing the solidified mud, which is the dredged mud modified in the modification step, in a transport device placed on the transport device placement section by the solidification mud mover of the narrow water area dredging system, a transport step of transporting the transport device containing the solidified mud placed on the transport device placement section to a work area facing the narrow water area that is accessible by vehicles, and an unloading and lifting step of unloading the transport device containing the solidified mud in the work area and lifting the modifier.

[0016] In addition, a ninth aspect of the present invention is configured to further include a classification step of removing garbage and the like from the solidified mud to obtain garbage-removed solidified mud.

[0017] Furthermore, a tenth aspect of the present invention is configured to further include a garbage removal and solidified mud loading process for loading the garbage removal and solidified mud into a vehicle waiting at the work site, and a transporting process for transporting the loaded garbage removal and solidified mud by the vehicle for reuse. Effect of the Invention

[0018] According to the present invention, it is possible to obtain the extremely advantageous effect of easily dredging small water areas, such as narrow rivers and canals, without causing deterioration of the environment or the spread of pollution. [Brief description of the drawings]

[0019] [Figure 1A] FIG. 1 is a cross-sectional view of a river showing an example of a water area to which the narrow water area dredging system according to the present invention can be applied. [Figure 1B] A perspective view of the cone index measuring instrument that measures the cone index [Figure 2A] FIG. 1 is a side view showing a narrow water area dredging system according to a first embodiment of the present invention. [Figure 2B] Plan view of a narrow water area dredging system according to embodiment 1 [Figure 2C] FIG. 1 is a side view illustrating a rope winding / releasing mechanism of a narrow water area dredging system according to a first embodiment. [Figure 2D] FIG. 2D is a plan view illustrating the operation of the rope winding / releasing mechanism of FIG. [Figure 2E] FIG. 1 is a plan view showing a loading and unloading work site of a narrow water area dredging system according to embodiment 1. [Figure 2F] Flowchart for explaining the operation of the narrow water area dredging system according to the first embodiment [Figure 2G] FIG. 1 is a side view showing a modified example of a narrow water area dredging system according to embodiment 1. [Diagram 3] FIG. 13 is a perspective view illustrating a barge in a narrow water area dredging system according to a second embodiment. [Figure 4A] Side view of a narrow water area dredging system according to embodiment 3 [Figure 4B] Plan view of a dredger in a narrow water area dredging system according to embodiment 3 [Diagram 5] Side view of a water flow device in a narrow water area dredging system according to embodiment 4 [Figure 6] Plan view of a narrow water area dredging system according to embodiment 5 [Figure 7] Flowchart for explaining the operation of the narrow water area dredging system according to the fifth embodiment DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] The following describes embodiments of the narrow water area dredging system and method according to the present invention. The relationships between the embodiments and the claims are as follows: embodiment 1 mainly relates to claims 1, 3, 4, and 8, embodiment 2 mainly relates to claim 2, embodiment 3 mainly relates to claim 5, embodiment 4 mainly relates to claim 6, and embodiment 5 mainly relates to claims 7, 9, and 10. It should be noted that the present invention is not limited to these embodiments, and can be embodied in various forms without departing from the spirit and scope of the present invention. <Embodiment 1 corresponds mainly to claims 1, 3, 4, and 8>

[0021] This embodiment mainly relates to claims 1, 3, 4 and 8. <Embodiment 1: Overview of the narrow water area dredging system>

[0022] The narrow water area dredging system of this embodiment is a system that dredges mud that has accumulated on the bottom of water areas such as rivers, canals, bays, and reservoirs, and modifies the dredged mud generated during the dredging process in the water area so that it can be reused, for example, as construction material (construction generated soil), and causes the solidified mud produced by this modification to float and be transported, for example, to an unloading area located on land facing the water area.

[0023] <Dredging> The narrow water area dredging system of the present invention is intended to dredge the bottom with a dredging thickness (thickness of mud deposited on the bottom) t of 0.3 to 0.5 m and a dredging width w of 5.0 to 10.0 m in a water area where the normal water depth d from the bottom of the water area excluding mud is 0.1 to 0.5 m, as shown in Figure 1A, but is not limited to these specifications. <Floating Movement> In the narrow water area dredging system according to the present invention, floating movement when transporting solidified mud refers to movement using a barge that can float in the water area and that can normally maintain a state in which the bottom of the barge does not touch the bottom of the water area when the solidified mud is loaded on it, or, even if it does, does not prevent the barge from moving. In other words, it refers to movement using a barge whose draft (depth from the water surface to the bottom of the barge) is smaller than the water depth. Therefore, when dredging is performed with a dredging thickness t of 0.3 to 0.5 m in a water area (e.g., a river) with a normal water depth d of 0.1 to 0.5 m assumed by the narrow water area dredging system according to the present invention, the downstream part of the river is partially dammed to ensure a water depth equal to or greater than the draft of the barge. <Modification> The physical modification of dredged mud generated during dredging is carried out based on the particle size distribution and water content of the mud in the water area identified through prior testing, and modifiers such as lime and cement are appropriately selected and added to the dredged mud depending on the purpose of reuse. When dredged mud generated during dredging is reused as construction materials (construction generated soil) as in the narrow water area dredging system according to the present embodiment, in order to make it possible to transport it by dump trucks or trucks and store it as embankment, for example, paper sludge (waste generated in the process of manufacturing recycled paper) is added as a modifier to the dredged mud generated during dredging to obtain a predetermined cone index (kN / m 2 ) and solidify. Here, the cone index is an index showing the hardness of compacted mud, and the cone index is measured using a cone index measuring instrument. As shown in FIG. 1B, the cone index measuring instrument 0100 is composed of a box-shaped measuring instrument body 0101 incorporating a pressure sensor, and a cone-tipped probe 0102 extending downward from the bottom surface of the measuring instrument body 0101. A vertical downward force (force in the direction of the arrow in the figure) is applied to the handles 0103, 0103 extending to the left and right of the measuring instrument body 0101, and the tip of the probe 0102 is inserted vertically into the mud M. The resistance of the mud M applied to the tip of the probe 0102 measured by the measuring instrument body 0101 during this process is expressed as a number, which is the cone index of the mud, and the number displayed in the display window 0104 of the measuring instrument body 0101 is the cone index. The higher the cone index value, the harder the mud is, and the lower the value, the softer the mud is. When the cone index is 400 kN / m 2 More than 800kN / m 2 The generated mud that has been solidified to less than 200 kN / m is mainly used as construction material, as backfill material for civil engineering structures, embankment material for roads, and river embankment material. 2 More than 400kN / m 2 The generated mud that has been solidified to less than 100m is mainly used as a material for filling water surfaces. In addition, the modification of dredged mud generated by dredging can be done by chemical modification, such as by adding lime to adjust the pH or by precipitating and removing harmful metal ions, or by removing organic matter.

[0024] In the narrow water area dredging system of the present invention, the dredged mud generated during dredging is modified in the narrow water area dredging system above the water area for reuse, and the solidified mud produced by this modification is transported, for example, to an unloading area on land facing the water area and unloaded, so that the unloading area is not contaminated by flowing mud, and as a result, environmental deterioration and the spread of pollution can be prevented. In addition, since there is no need for complicated preparation work such as installing pipes and adjusting their lengths, which are essential for pressure transfer by pumping, dredging of water areas can be carried out easily. <Embodiment 1 Narrow water area dredging system configuration mainly corresponds to claims 1, 3, 4, and 8>

[0025] The narrow water area dredging system according to this embodiment is a system that is assumed to perform dredging of a narrow river (narrow water area) with a water depth of 0.1 to 0.5 m and a river width of 5.0 to 10.0 m. As shown in Figs. 2A and 2B, the narrow water area dredging system according to this embodiment has a solidified mud container mounting part 0201, a mixer 0220, and a carrier mounting part 0202, and may also have a dredger 0210 and a rope winding and paying out mechanism 0230. In addition, the mixer 0220 may also serve as a solidified mud mover as described later, and the solidified mud container mounting part 0201, the dredger 0210, the mixer 0220, the carrier mounting part 0202, and the rope winding and paying out mechanism 0230 are all provided on a barge 0200 that can float and move on the water. <Embodiment 1 Configuration A barge that can float and move on water Mainly corresponds to claims 1, 3, 4, and 8>

[0026] The barge 0200, which can float and move on the water, is flat with a length of 11.5 to 12.5 m, a width of 5.5 to 6.5 m, and a thickness of 0.3 to 0.7 m, and is formed so that the draft is less than 0.1 m when it is fully loaded with dredged mud in addition to equipment such as the dredger 0210 and the mixer 0220. The barge 0200 can be manufactured, for example, by wrapping a core material formed into a flat plate by foaming polyurethane with glass cloth and laminating the glass cloth with epoxy resin, or by laminating multiple epoxy resin layers on a core material of polystyrene foam formed into a flat plate. The dimensions of the length, width, and thickness of the barge 0200, the materials, and the manufacturing method are not limited to those in this embodiment. <Embodiment 1 Configuration Solidified mud container placement part Mainly corresponds to claims 1, 3, 4, and 8>

[0027] The solidified mud container mounting sections 0201 are provided at two locations on each of the port and starboard sides of the barge 0200, and the solidified mud containers 0203, 0203 are respectively placed on these solidified mud container mounting sections 0201 and secured in place by locking mechanisms not shown. In this embodiment, the barge 0200 is adapted to head to the dredging site with paper sludge P stored as a modifier in each of the solidified mud containers 0203, 0203. <Embodiment 1 Configuration Dredge Mainly corresponds to claims 1, 3, 4, and 8>

[0028] The dredger 0210 is a so-called backhoe that scoops up mud in a water area and places the scooped dredged mud in a solidified mud container 0203, and is equipped with a pair of left and right crawlers 0211, a cabin 0212 that is a driver's seat located above the crawlers 0211, and a bucket mechanism 0213 that performs excavation and digging operations, and the cabin 0212 and the bucket mechanism 0213 can rotate 360° together with the pair of crawlers 0211. In this embodiment, the excavation volume by the bucket mechanism 0213 is 0.1 m 3 A small backhoe is used as the dredger 0210, which is disposed at the upstream end of the barge 0200. This dredger 0210 is configured to dump dredged mud into the solidified mud containers 0203, 0203 in which the paper sludge P is stored on the solidified mud container mounting portion 0201 in the water area including the dredging area. <Embodiment 1 Configuration Mixer Mainly corresponds to claims 1, 3, 4, and 8>

[0029] In this embodiment, the mixer 0220 is a backhoe having the same structure as the dredger 0210, and is equipped with a pair of left and right crawlers 0221, a cabin 0222, and a bucket mechanism 0223, and the cabin 0222 and the bucket mechanism 0223 are capable of rotating 360° together with the pair of crawlers 0221. In this embodiment, the mixer 0220 also has a bucket mechanism 0223 with an excavation capacity of 0.1 m 3 The mixer 0220 is disposed at the downstream end of the barge 0200. The mixer 0220 mixes the paper sludge P, which is a modifier stored in advance, with the dredged mud introduced by the dredger 0210 in the solidification mud containers 0203, 0203 of the solidification mud container placement unit 0201, to produce solidified mud (with a cone index of 200 kN / m 2 The above modifications are being made. <Embodiment 1 Configuration Carrier placement unit Mainly corresponds to claims 1, 3, 4, and 8>

[0030] The carrier placement part 0202 is a flat plate with a length of 7.5 to 8.5 m, a width of 5.5 to 6.5 m, and a thickness of 0.1 to 0.4 m, and is provided continuously with the downstream end of the barge 0200. A plurality of carriers (sandbags) 0205 (eight in this embodiment) are placed on the carrier placement part 0202 for transporting the solidified mud modified in the solidified mud container 0203 out of the water area, and are arranged vertically and horizontally. The carrier placement part 0202 in the form of a flat plate is also formed so that the draft is less than 0.1 m when fully loaded with a plurality of carriers 0205 containing solidified mud, and the carrier placement part 0202 can be manufactured by the same manufacturing method as the barge 0200. The dimensions of the length, width, and thickness of the carrier placement part 0202, the material, and the manufacturing method are not limited to those in this embodiment. <Embodiment 1 Configuration Solidified mud mover (mixer) Mainly corresponds to claims 1, 3, 4, and 8>

[0031] The mixer 0220 , which also serves as a solidified mud mover, also plays a role in scooping up the modified solidified mud in the solidified mud container 0203 and transferring it to a plurality of carriers 0205 placed on the carrier placement section 0202 . <Embodiment 1 Configuration Rope winding / releasing mechanism Mainly corresponds to claims 1, 3, 4, and 8>

[0032] The rope winding / releasing mechanism 0230 is a drive mechanism for floating and moving the barge 0200 and the transportation equipment mounting section 0202 in the water area, and as shown enlarged in Figure 2C, this rope winding / releasing mechanism 0230 is equipped with a rope 0231 that is stretched between the shore (land side) facing the water area and the barge 0200 side, and a manual winch 0233 that is positioned on the barge 0200 side via a support 0232. One end of the rope 0231 is wound and fixed around a stake 0234 installed at an appropriate position on the ground as described below, and the other end is connected to a drum 0233a of a winch 0233, and the rope 0231 is wound and unwound by rotating the drum 0233a via a handle 0233b of the winch 0233. At this time, the winch 0233 is attached to the support 0232 in a state in which it can freely rotate around the support 0232 (in the direction of the arrow in the figure), and by making the winch 0233 always face in a direction in which the rope 0231 can be wound and unwound when tension is applied to the rope 0231, the rope 0231 is prevented from coming off the drum 0233a.

[0033] As shown in Figure 2D, the narrow water area dredging system of this embodiment has a total of four rope winding and paying-out mechanisms 0230, two on the port and starboard sides at the upstream end of the barge 0200 and two on the port and starboard sides at the downstream end of the transportation equipment mounting section 0202, and each winch 0233 of these rope winding and paying-out mechanisms 0230 is positioned at two corners at the upstream end of the barge 0200 and two corners at the downstream end of the transportation equipment mounting section 0202, respectively. On the other hand, the stakes 0234 around which one end of the rope 0231 is wound and fixed are installed on opposing banks on the upstream side of the river where dredging of the dredging area begins, and on opposing banks on the downstream side of the river where dredging ends. These stakes 0234 are moved downstream and re-installed as the dredging area is moved downstream. Note that the object to which one end of the rope 0231 is fixed is not limited to the stakes 0234, and may be an existing sturdy fence, telegraph pole, building, etc.

[0034] In the narrow water area dredging system of this embodiment, the barge 0200 and the transportation equipment mounting section 0202 are steered by appropriately rotating the handles 0233b of each winch 0233 of the four rope winding and paying-out mechanisms 0230 to wind and pay-out the rope 0231. For example, when floating and moving the barge 0200 and the transport equipment mounting unit 0202 from the upstream side of the river where dredging of the dredging area begins to the downstream side of the river (when changing from the state shown by the solid line to the state shown by the dotted line in Figure 2D), the handles 0233b of two winches 0233 at the upstream end of the barge 0200 are operated to pay out the rope 0231 from the drum 0233a, and the handles 0233b of two winches 0233 at the downstream end of the transport equipment mounting unit 0202 are operated to wind the rope 0231 onto the drum 0233a, thereby floating and moving the barge 0200 and the transport equipment mounting unit 0202 to the downstream side of the river. During this time, by locking each winch 0233 to stop winding and paying out while applying appropriate tension to each rope 0231 of the four rope winding and paying-out mechanisms 0230, the barge 0200 and the transportation equipment mounting section 0202 can be stopped in an appropriate position with almost no wobbling. Furthermore, it goes without saying that by operating the two winches 0233 at the upstream end of the barge 0200 to wind up the rope 0231 and by operating the two winches 0233 at the downstream end of the transport equipment mounting section 0202 to pay out the rope 0231, the barge 0200 and the transport equipment mounting section 0202 can be made to float upstream of the river against the flow of the river.

[0035] In the narrow water area dredging system of this embodiment, a manual winch 0233 is used for the rope winding and payout mechanism 0230, but this is not limited to this and an electric winch can also be used, in which case it is desirable to have a configuration that includes a controller that controls the operation of multiple electric winches. <Embodiment 1 Narrow water area dredging system Loading Mainly corresponds to claims 1, 3, 4, and 8>

[0036] In the narrow water area dredging system of this embodiment, as shown in Figure 2E, it is desirable to set up a work area A indicated by a virtual line where a vehicle D can enter, facing a river, which is a narrow water area, and to place a crawler crane 0240 in this work area A for unloading the transport device 0205 containing the solidified mud and lifting the modifier. <Embodiment 1 Narrow water area dredging system Operation Mainly corresponds to claims 1, 3, 4, and 8>

[0037] When dredging and modification are performed by the narrow water area dredging system according to this embodiment, in a preparation step 0201S, the narrow water area dredging system is prepared on the upstream side of a river, which is a water area, as shown in Fig. 2F. Specifically, a barge and a carrier mounting unit are advanced into the river from a work site set in a place facing the river, and a solidification mud container, a dredger, a mixer, and a carrier are placed on the barge and the carrier mounting unit advanced into the river, and a rope winding and paying-out mechanism, which is a driving mechanism, is set on the barge and the carrier mounting unit. Then, after paper sludge as a modifier is respectively put into the solidification mud container from the work site, the winch of the rope winding and paying-out mechanism is appropriately operated to move the barge and the carrier mounting unit toward the upstream dredging location of the dredging area.

[0038] Next, in the mud scooping process 0202S, the river, which is a water area, is dredged with a dredger, and the dredged mud is poured into the solidification mud container in which the paper sludge is stored on the solidification mud container placement part. This dredging with the dredger and the pouring of the dredged mud into the solidification mud container are carried out a predetermined number of times while proceeding downstream of the river. When a predetermined amount of dredged mud is poured into the solidification mud container, in the modification step 0203S, the dredged mud and paper sludge are mixed in a mixer in the solidification mud container, and modification to solidified mud is carried out. Next, in the solidified mud storing step 0204S, the solidified mud is stored in the carrier placed on the carrier placement section by the mixer which also serves as the solidified mud mover. Then, in the transportation process 0205S, the winch of the rope winding / releasing mechanism is appropriately operated to move the barge carrying the transport equipment containing the solidified mud and the transport equipment placement section to a work site facing a narrow water area where vehicles can enter. Then, in the unloading / lifting process 0206S, the transport equipment containing the solidified mud is loaded onto a dump truck waiting at the work site and transported away, and at the same time, paper sludge is poured into the already emptied solidified mud container as a modifier. <Embodiment 1 Narrow water area dredging system Modifications Mainly corresponds to claims 1, 3, 4, and 8>

[0039] In the narrow water area dredging system according to this embodiment, dredging of a river, which is a water area, is performed by a dredger, but for example, as shown in Fig. 2G, a carrier mounting part 0202 may be set on a barge 0200, and a mixer 0220, which also functions as a solidified mud mover that transfers solidified mud to a carrier 0205 on the carrier mounting part 0202, may also play the role of a dredger. In other words, the mixer 0220 may play three roles: dredging, modification, and transfer. <Embodiment 1 Narrow water area dredging system Effects mainly correspond to claims 1, 3, 4, and 8>

[0040] In the narrow water area dredging system of this embodiment, the dredged mud generated during dredging is modified in the water area for reuse, and the solidified mud resulting from this modification is transported, for example, to an unloading area on land facing the water area. This prevents the unloading area from being contaminated by flowing mud, thereby preventing environmental deterioration and the spread of pollution. In addition, there is no need for complicated preparatory work such as pipe installation and length adjustment, which are essential when using a pump to pump the mud, so dredging the water area can be easily performed. <Embodiment 2>

[0041] This embodiment mainly relates to claim 2. <Embodiment 2: Overview of the narrow water area dredging system>

[0042] This embodiment is based on embodiment 1, and in the narrow water area dredging system of this embodiment, floating movement on the water is achieved by a float assembly that can be assembled to any size by combining multiple float plates.

[0043] In the narrow water area dredging system of this embodiment, the size of the float assembly that floats on the water can be easily changed, making it possible to accommodate changes in the shape of narrow water areas. <Embodiment 2 Narrow water area dredging system configuration mainly corresponds to claim 2>

[0044] The narrow water area dredging system of this embodiment is characterized by the fact that it is made up of a float assembly that can be assembled to any size by combining multiple float plates, forming a barge that can float and move on the water.

[0045] Fig. 3 is a simplified diagram showing a floating and movable barge of the narrow water area dredging system according to this embodiment, and as shown in the upper part of Fig. 3, the floating and movable barge 0300 on the water is assembled by combining a plurality of float plates 0310 (6 x 6 = 36 pieces) each having a substantially cubic shape. In this case, as shown in the partially enlarged plan view at the bottom of Fig. 3, recesses 0312 are formed on two mutually perpendicular faces of the four outward faces 0311 of the float plate 0310, and protrusions 0313 are formed on the remaining mutually perpendicular faces, so that the float plates 0310 can be connected to each other by engaging the recesses 0312 and the protrusions 0313 of the adjacent float plates 0310 with each other. That is, the barge 0300 shown in the upper part of Fig. 3, which is assembled by arranging the float plates 0310 in 6 rows and 6 columns, can be changed to the shape of the barge 0300S shown in the middle part of Fig. 3, which is assembled by arranging the float plates 0310 in 9 rows and 4 columns. Note that the configuration for connecting adjacent float plates 0310 is not limited to the above, and for example, a connecting structure using a simple connector such as a rivet can be adopted. <Embodiment 2 Narrow water area dredging system Effect Mainly corresponds to claim 2>

[0046] In the narrow water area dredging system according to this embodiment, since the size of the float assembly that floats and moves on the water can be easily changed, it can cope with changes in the form of narrow water areas, for example, the expansion and contraction of the river width of a river. <Embodiment 3>

[0047] This embodiment mainly relates to claim 5. <Embodiment 3 Narrow Water Area Dredging System Overview>

[0048] This embodiment is based on Embodiment 1. The narrow water area dredging system according to this embodiment has a dredger that scoops up the mud in the water area and puts the scooped dredged mud into a solidified mud container, and the dredger has a pair of floating crawlers and a gap adjustment unit for adjusting the gap between these floating crawlers.

[0049] In the narrow water area dredging system according to this embodiment, since the gap between the pair of floating crawlers in the dredger can be adjusted, it can cope with changes in the form of narrow water areas. <Embodiment 3 Narrow Water Area Dredging System Configuration Mainly Corresponding to Claim 5>

[0050] The feature of the narrow water area dredging system according to this embodiment compared with the narrow water area dredging system according to Embodiment 1 is that, as a dredger that scoops up the mud in the water area and puts the scooped dredged mud into a solidified mud container, a dredger having a pair of floating crawlers and a gap adjustment unit for adjusting the gap between these floating crawlers is adopted.

[0051] As shown in FIGS. 4A and 4B, the dredger 0410 of the narrow water area dredging system according to this embodiment is a heavy machine called a backhoe-type so-called mud surface excavator, and includes a pair of left and right crawlers 0411, a cabin 0412, and a bucket mechanism 0413. The cabin 0412 and the bucket mechanism 0413 of this dredger 0410 can rotate integrally 360° with respect to the pair of crawlers 0411, and this dredger 0410 is arranged in the river on the upstream side of the pontoon 0400. At this time, the pair of crawlers 0411 of the dredger 0410 are floating crawlers, which float to the extent that they can move under their own power while slightly touching the bottom of the river. In addition, the dredger 0410 has a spacing adjustment unit 0415 for adjusting the spacing between a pair of floating crawlers 0411, and the spacing between the pair of crawlers 0411 can be changed by moving the pair of crawlers 0411 between the state shown by the solid lines and the state shown by the dashed dotted lines in Figure 4B. <Embodiment 3 Narrow water area dredging system Effect Mainly corresponds to claim 5>

[0052] In the narrow water area dredging system of this embodiment, the spacing between a pair of floating crawlers 0411 of a dredger 0410 placed in a river can be changed, making it possible to respond to changes in the shape of the narrow water area, for example, the expansion or contraction of the river width. <Embodiment 4>

[0053] This embodiment mainly relates to claim 6. <Embodiment 4: Overview of the narrow water area dredging system>

[0054] This embodiment is based on embodiment 1, and the narrow water area dredging system of this embodiment further includes a water flow device for use when the channel height is restricted to 1.5 meters or more and 3 meters or less by tunnels, bridges, and other structures in the narrow water area.

[0055] The narrow water area dredging system according to this embodiment has the effect of making it possible to dredge areas that are difficult to work on using a dredging equipment. <Embodiment 4 Narrow water area dredging system configuration mainly corresponds to claim 6>

[0056] 5, the narrow water area dredging system according to this embodiment includes a barge 0500, a jet pump 0502 mounted on the barge 0500 and sucking up river water through a hose 0501, and an ejector (water flow device) 0503 that generates negative pressure by a high-pressure water flow indicated by a white arrow pumped from the jet pump 0502 to suck up mud from the river. When the channel height is restricted to 1.5 meters to 3 meters by tunnels, bridges, and other structures in the narrow water area, the narrow water area dredging system according to this embodiment moves the barge 0500 into the channel and moves the river mud sucked up by the ejector 0503 together with the high-pressure water flow from the jet pump 0502 via a hose 0504 to another water area (downstream in the case of a river) where the channel height is not restricted.

[0057] In this embodiment, mud removed from water areas where the channel height is limited to 1.5 meters or more and 3 meters or less is dredged using the narrow water area dredging system of embodiment 1, and then modified. <Embodiment 4 Narrow water area dredging system Effect Mainly corresponds to claim 6>

[0058] The narrow water area dredging system of this embodiment has the advantage of being able to perform dredging and modification even in sections where it is difficult to work with a dredging equipment, where the channel height is limited to 1.5 meters or more and 3 meters or less. <Embodiment 5>

[0059] This embodiment mainly relates to claims 7, 9 and 10. <Embodiment 5: Overview of the narrow water area dredging system> This embodiment is based on embodiment 1, and the narrow water area dredging system of this embodiment uses a classification device to remove garbage and other debris mixed in the solidified mud, and then loads the garbage-removed solidified mud from which the garbage and other debris have been removed onto a vehicle waiting at the work site and transports it for reuse.

[0060] The narrow water area dredging system according to this embodiment has the effect of making it possible to remove garbage and other materials mixed in the solidified mud and transport it for reuse. <Embodiment 5 Narrow water area dredging system configuration mainly corresponds to claims 7, 9, and 10>

[0061] The narrow water area dredging system of this embodiment is characterized by the fact that, as compared with the narrow water area dredging system of embodiment 1, a classification device 0650 for removing debris mixed in the solidified mud is placed on a barge 0600, as shown in Figure 6. <Embodiment 5 Narrow Water Area Dredging System Operation Mainly corresponds to claims 7, 9, and 10>

[0062] When dredging and modification is performed using the narrow water area dredging system of this embodiment, as shown in Figure 7, in a classification step 0707S, garbage and the like are removed from the solidified mud modified in the modification step 0703S to produce garbage-removed solidified mud, and in a garbage-removed solidified mud loading step 0708S, the garbage-removed solidified mud unloaded in the unloading step 0706S is loaded onto a vehicle waiting at the work site, and then in a transport step 0709S, the garbage-removed solidified mud loaded onto the vehicle is transported for reuse. <Embodiment 5 Narrow Water Area Dredging System Effects mainly correspond to claims 7, 9, and 10>

[0063] The narrow water area dredging system according to this embodiment has the advantage of being able to remove garbage and other materials mixed in the solidified mud and transport it for reuse. [Explanation of symbols]

[0064] 0201 Solidified mud container placement part 0202 Carrier placement section 0203 Solidified mud container 0205 Transportation equipment 0220 Mixer (also serves as solidified mud mover)

Claims

1. a solidification mud container placement section for placing a solidification mud container for mixing a modifier with the dredged mud to modify the dredged mud; The dredged mud carried into the solidification mud container is mixed with the modifier to produce solidified mud (with a cone index of 200 kN / m ２ A mixer for mixing the above components, A carrier placement section for placing a carrier for transporting the solidified mud in the solidified mud container; A solidified mud mover that puts solidified mud into a carrier placed on the carrier placement section; A dredging system for narrow water areas that can be floated and moved on the water.

2. The narrow water area dredging system of claim 1, wherein the floating is achieved by a float assembly which can be assembled to any size by combining a number of float plates.

3. A narrow water area dredging system as described in claim 1 or claim 2, which has a rope winding and paying out mechanism for floating movement using a rope fixed to the ground facing the water area.

4. The narrow water area dredging system according to claim 1 or claim 2, further comprising a dredger having a function of scooping up mud and depositing the scooped dredged mud into a solidified mud container.

5. The dredger includes a pair of floating crawlers for movement; A gap adjustment unit for adjusting a gap between the pair of floating crawlers; 5. The narrow water dredging system of claim 4, comprising:

6. The narrow water area dredging system of claim 1 further comprises a water flow device which, when the channel height is restricted to 1.5 meters or more and 3 meters or less by a tunnel, bridge or other structure in the narrow water area, enters the channel and uses a water flow to move mud from that area to another water area where the channel height is higher than 3 meters or there is no restriction on the channel height.

7. 2. The narrow water area dredging system according to claim 1, further comprising a classification device for removing debris mixed in the solidified mud.

8. A preparation step of preparing the narrow water area dredging system according to claim 1 in a water area; A mud scooping process to scoop mud from the water area, A modification process in which the dredged mud scooped in the mud scooping process and the modifier are mixed by a mixer in a solidification mud container of the narrow water area dredging system to form solidified mud; A solidified mud storage process in which the solidified mud, which is the dredged mud modified in the modification process, is stored in a carrier placed on a carrier placement section by a solidified mud mover of the narrow water area dredging system; a transporting step of transporting the transport containing the solidified mud placed on the transporting tool placement section to a work site facing a narrow water area and accessible to vehicles; A loading and unloading process of unloading the carrier containing the solidified mud in the work area and unloading the modifier; A method for dredging a narrow water area.

9. The method for dredging a narrow water area according to claim 8, further comprising a classification step for removing debris and the like from the solidified mud to obtain debris-removed solidified mud.

10. a waste removal and solidified mud loading process for loading the waste removal and solidified mud into a vehicle waiting at the work site; a carrying out step of carrying out the loaded solidified mud by the vehicle for reuse; The method for dredging a narrow water area according to claim 9, further comprising:

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