JPH0336372B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a dredging suction head device that can be used to dredge earth and sand with a high mud content using a dredger. [Prior Art] Conventionally, when dredging earth and sand on the seabed, as shown in FIG. While swinging the hull around the spud 4 driven into the seabed,
The material to be dredged 5 is pumped up at the suction port of the suction head 3 by a suction pipe 7 combined with a pump 6 on the dredger 1. In the above-mentioned seabed dredging work, the key point of the work is how to dredge the seabed object 5 to be dredged in a state as close to its original form as possible, that is, with a high mud content with little moisture. On the other hand, conventional suction head devices designed for soft earth and sand had insufficient stirring and mixing ability, and were therefore effective for soft materials such as sludge, but they were effective against soft materials such as sludge, for example, in loose sand layers and clay layers with low water content. When targeting the object 5 to be dredged, there were problems in that work efficiency was poor and dredging with a high mud content was not possible. [Object of the Invention] Therefore, the present invention has been made to solve the above-mentioned conventional problems, and provides a suction head device that is capable of dredging with a high mud content even for dredging material that is harder than sludge. The purpose is to provide the following. [Structure of the Invention] That is, the suction head device for dredging of the present invention connects the suction port of the suction head combined with the pump to the suction head of the dredged material, which is a hollow rotary body with screw blades for scraping the dredged material attached to the outside. The dredged material is provided in the raking part so that the material to be dredged is transported through the hollow rotary body, and a stirring and mixing device for the dredged material is provided in front of the hollow rotary body in the swing direction. [Embodiment] An embodiment of the present invention will be described below with reference to the drawings. First, FIG.
It is provided at the tip of the rudder 2, similar to the dredger 1 shown in the conventional example in the figure. Next, as shown in the enlarged front view of FIG. 2, this suction head 3 has a hollow rotating body 10 driven by an underwater motor 8 via a chain 11 along an opening provided at the bottom of the main body cover. established,
Furthermore, since symmetrical screw blades 9 are provided on the outer periphery of the hollow rotary body 10 in FIG. Next, this hollow rotating body 10 is formed in a cylindrical shape so as to communicate with the suction pipe 7 combined with the pump 6 on the dredger 1 at the left end in FIG. 3, as in the conventional example shown in FIG. As shown in Fig. 3, a suction port 12 is provided on the outer periphery of the central portion, and the dredged material 5 from the left and right, which has been raked up to the central portion by the left and right screw blades 9, is collected by the suction port 12 as shown by the arrow. It is adapted to be introduced into the suction pipe 7. In this embodiment, as described above, since the material to be dredged 5 flows to the left from the center of the hollow rotating body 10, a conical shape is formed from the center to the right in the hollow rotating body 10 so that the material to be dredged 5 does not get stuck. Shape Cap 13
is provided inside the hollow rotating body 10. In addition, the main body cover of the suction head 3 is located at the front in the moving direction indicated by the arrow S, that is, at the suction port 12.
A rotor 14 for stirring and mixing the material to be dredged 5 is provided in front of the hollow rotating body 10 in the swing direction, and
This rotor 14 is rotated by the underwater motor 8 via a chain 11. The rotor 14 has a large number of screw blades 16 on its circumferential surface as shown in FIG. 5, and the tips of the screw blades 16 are configured to stir and mix the material 5 to be dredged. Also,
When the rotors for stirring and mixing are arranged before and after the screw blades as shown in Fig. 2, there is an advantage that the rotors 14 and 14' for stirring and mixing can be used both in the reciprocating motion, that is, in the S direction and the S' direction. be. When dredging is carried out using the suction head device of the present invention having the above configuration, the rotor 14 for agitation and mixing loosens the earth and sand of the material to be dredged 5 which is harder than sludge, while the screw blade of the rotating body 10 immediately behind 9, suck it into the central suction port 12,
Since it is designed to be introduced into the suction pipe 7, dredging with a high mud content is possible. In this embodiment, removable ground pressure adjusting plates 15 for adjusting the ground pressure are attached to both sides of the main body cover of the suction head device. Next, the results of a dredging experiment using sand and cohesive soil as the material to be dredged 5 are shown in the following table using the model with the rotor 14 for stirring and mixing shown in the above example and the model without the rotor 14. It is shown in

【table】

〔Effect of the invention〕

Therefore, if the suction head device of the present invention is adopted for dredging, it becomes possible to dredge with a high mud content even for muddy soil to be dredged, which is harder than sludge, and is extremely effective in improving dredging performance. As a result, in the present invention, since the stirring and mixing device for the dredged material is provided in front of the hollow rotating body in the swing direction of the hollow rotating body having screw blades for scraping up the material to be dredged, the material to be dredged is first loosened by the stirring and mixing device, and then the material to be dredged is loosened. Since the material to be dredged is scraped up by the screw blades and transported inside the hollow rotating body, it is possible to dredge with a high mud content.Furthermore, when the material to be dredged enters the hollow rotating body, Since it also serves as a passage for the dredged material, it is possible to smoothly transfer the dredged material, and the dredged material collected by the screw blades of the hollow rotary body is transported inside the existing hollow rotary body. It is possible to transfer the suction head to the outside of the suction head through the suction head, which not only eliminates the need to provide a separate suction port in the suction head as in the conventional case, but also allows the suction to be transferred from the left and right to the central point by the screw blade, unlike the conventional method. In the present invention, the problem of clogging of sludge at the confluence point due to the introduction of the dredged material into a separately provided suction pipe does not occur in the present invention, and the dredged material is introduced into the hollow rotating body from the suction port on the extension line of the direction. Since the sludge can be discharged in a straight line, sludge clogging does not occur and the sludge can be transferred smoothly.

[Brief explanation of drawings]

1 is a schematic front view of a suction head device according to an embodiment of the present invention, FIG. 2 is an enlarged front view of the main part of FIG. 1, and FIG. 3 is a side sectional view taken along the line A-A in FIG. FIG. 4 is a layout diagram of a suction head device of a conventional dredger, and FIG. 5 is a partial side view of a rotor for stirring and mixing. 3... Suction head, 5... Dredged material, 6
... Pump, 9 ... Screw blade, 10 ... Hollow rotating body, 12 ... Suction port, 14 ... Rotor, 16
... Screw Blade.

Claims (1)

[Claims] 1. The suction port of the suction head combined with the pump is provided in the raking part of the material to be dredged of a hollow rotary body to which screw blades for raking the material to be dredged are attached to the outside, and the material to be dredged is collected inside the hollow rotary body. A suction head device for dredging, which is configured to transport dredged material, and is provided with a stirring and mixing device for dredged material in front of the hollow rotating body in the swing direction.