JPS62141224A - Casting of sand into bottom under water - Google Patents

Abstract

PURPOSE:To enhance the efficiency, operability, safety, and exactness of sand casting work by a method in which an inductive hood divided into plural flow paths expanded downwards is provided connectedly to the lowermost stage duct in such a way as to enable sand to go down in a wide range with an equal flow rate. CONSTITUTION:An inductive hood 8 divided into plural slow paths 11 gradually expanded downwards by plural partition walls 9, having an upper cylinder 8a on its upper part and a lower cylinder 8b on its lower part, is connected to the lowermost stage duct 1. The lower end of the upper stage tube is inserted into the upper end of a large-diameter lower stage tube, and the upper end of the duct 1 with an aperture S is vertically held between both the tubes in such a way as to position its upper end slightly below water surface 3 and also its lower end slightly above the bottom 16 under water. Sand dropped continuously from the hopper 6 into the duct 1 is dividedly introduced to each flow path 11 and allowed to flow down from the lower open grille 12. The economically stable and efficient operations with improved operability can thus be performed.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a method for pouring sand into the water bottom, which is employed in works such as laying sand, filling sand, and replacing sand in underwater structure construction work. .

(Prior Art) The inventor of the present application has discovered that the conventional method of dropping sand directly into water causes a large loss of sand, and that, especially when the water is deep, several times the amount of sand that far exceeds the required amount is scattered around. We have already developed a sand pouring method that solves various disadvantages such as economic efficiency, inability to efficiently lay sand in a specified flat shape, and muddying the surrounding water due to large amounts of sand scattered around. Researched and invented (Tokuko Shoj 4/--? 3 Guzahiro).

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A conduit that passes slightly into the upper end of the hole shot and is connected in several stages so as to form an appropriate gap between the upper end pipe and the lower pipe, with the upper end slightly below the water surface and the lower end slightly below the water bottom. It is held vertically in the water so that it is in the upper position, and the lower part of the discharge port of the hob par is inserted into the upper end of the uppermost pipe of the conduit to form a gap in the charging section, and the sand put into the hob par is held vertically in the water. Continuously falls into the conduit through the discharge port, and as the sand falls, it is induced to flow into the conduit through the circumferential gap from the upper end opening of the top pipe and the openings of each stage connection by the ejector action. This method of pouring sand into an underwater structure is characterized in that the sand is forced down by a downward water flow.

(Problems to be Solved by the Invention) As a result of further research tests, the inventor of the present application found that the above method is sufficiently effective for laying sand and embankment in a relatively narrow area, but for example, in a vast area. We found that in order to perform sand laying, filling, and replacement sand work evenly and evenly in a large area, it is still not perfect in terms of efficiency, workability, stability, and reliability. There is a wide range of sand from the bottom of the
This is due to the fact that the flow rate is not lowered in a balanced manner. - [Means for Solving the Problems] This invention has been made to solve the above-mentioned problems, and in the sand pouring method, the inside is divided into a plurality of downflow passages and the sand pouring channels are directed downward. An induction hood having a gradually widening portion is provided so as to communicate with the lowermost conduit,
The sand descending from the lowermost conduit is dispersed and guided into each of the above-mentioned downflow passages, so that the sand falls widely at an almost uniform flow rate from each opening grill formed by the lower surface of each of the downflow passages of the induction hood. To provide a method for pouring sand into the water bottom, which is characterized by the following.

This invention will be described in detail below with reference to drawing examples.

First, in Figures 1 and 2, the lower part of the upper pipe is inserted slightly into the upper end of the lower pipe with a larger diameter than that, and an appropriate circumferential gap S is formed between the upper pipe and the lower pipe. The conduit / connected by a multi-stage chain 2 is held vertically in water by an appropriate method so that the upper end is slightly below the water surface 3 and the lower end is slightly above the water bottom / 6 . In addition, the lower part of the discharge row 6' of the hopper A is inserted into the upper end of the uppermost pipe of the conduit and is held vertically so as to form a circumferential gap S in the loading section. Winch, 7 is a frame.

Then, the sand continuously thrown into the hopper 6 by the grab of the sand transport ship 7 is allowed to fall continuously into the conduit through the discharge port 1, and as the sand falls, the ejector action causes the sand to reach the top stage. It is known that the sand is caused to fall by being energized by a downward water flow induced to flow into the conduit through the circumferential gap S from the upper end opening of the pipe and the openings of the connecting parts of each stage (Tokuko Sho!; 1l-23'/-1'l).

Next, the interior has a plurality of partition walls 7 and a plurality of flow passages/
This is an induction hood that gradually becomes wider toward the bottom and is divided into /. . In addition, the above-mentioned induction hood t has the shape shown in the diagram, such as a square pyramid or a conical shape JL 1! L 1 PU KENSHI NO-K TABLE AT GAKE OU BEAT NO J YUSHA V, BOOK 7 Various grill shapes such as those shown in Figures 2 and 3 can be selected and used accordingly. In addition, the lower part 9b of each of the partition walls 9
are fixed respectively, but each upper part 9a has a pivot 10, respectively.
It can be tilted freely around the axis, and its position can be varied, for example, as shown by the chain line in FIG. 3, so that the upper opening of each flow path /l can be varied wide or narrow. Further, at the upper end of the upper part 9a of each of the partition walls, there are projecting screws that are inserted into circular arc holes /3 that are centered around the pivot shaft 10 that is bored in the side wall of the guide hood. /
It is a trap so that the upper part 9a can be fixed in any position by tightening the nuff)/5- screwed into the upper part 9a.

Therefore, the present invention provides an induction hood having a portion in which the interior thereof is divided into a plurality of flow passages and gradually widens downward, so as to communicate with the lowermost conduit, and the lowermost conduit. The sand descended from the conduit///I
It is configured so that the ICs are widely distributed and guided.

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lsr '7 yy l-A Izrr? This can easily be done in the case of bedding sand with a +4 area area or replacement sand that has a narrow and deep construction width as shown in Fig.

(Effects of the Invention) The method of this invention has the above-mentioned configuration, and allows the flow to be lowered over a wide range from the lower surface of the guide 7-door, which has a portion that gradually becomes wider toward the bottom, at each round with an approximately uniform flow rate. Because of this, it has the outstanding effect of being able to perform the flat and even work of laying sand, embankment sand, and replacement sand over a vast area easily, efficiently, easily, and stably with extremely good workability. Further, according to the present invention, there is an excellent effect that even when there is a large tidal current, economical work can be carried out stably without scattering sand around the surrounding area.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a partially cutaway front view of the main parts, FIG. 2 is a side view of the same, and FIG. 'I
The figure is a bottom view of an embodiment of the opening grille, Figure 3 is an enlarged longitudinal sectional front view of the main part, Figure 3 is a longitudinal sectional view showing the fixing device at the top of the bulkhead, and Figures 7 to 9 are construction work. It is an explanatory diagram of a state. /1. Conduit, 20. Chen, 30. Water surface, ≠. -Made i ship, j, , power winch, Otsu 1. hopper,
. 6'6. Outlet, 70. Frame, Z0. induction hood,
f a , upper cylinder part, za 60. Lower bottom cylindrical part, 9°, partition wall, wa a6. Top, 9b0. Lower part, 10. . Axis, //1. Downfall path, /20. Opening grill, /300
Enkohole 1/l0. Thrust screw, /j0. Natsuto, /60. Underwater, /70. Sand carrier, /za0. Grab S s...Gap, Patent applicant Takasago Construction Co., Ltd. No. 81! l FIG. 9/・Conduit 30. Water surface 0. Hopper g'・・Discharge port 0. Induction hood //1. Downfall path/20. Opening grill/Otsu6. Underwater bottom 8 ・ ・ No gap

Claims (1)

[Claims] The lower end of the upper pipe is inserted slightly into the upper end of the lower pipe with a larger diameter, and several stages of conduit are connected to the upper end so as to form an appropriate gap between the upper pipe and the lower pipe. The hopper is held vertically in the water so that it is slightly below the water surface and its lower end is slightly above the water bottom, and the lower part of the outlet of the hopper is inserted into the upper end of the top pipe of the conduit to create a gap in that part. The sand placed in the hopper is continuously dropped into the pipe through the discharge port, and as the sand falls, the ejector action opens the upper end of the top pipe and the connections at each stage. In a method for pouring sand into an underwater structure, the interior of the structure is divided into a plurality of flow paths, and the sand is lowered by being energized by a downward water flow induced to flow into the conduit through a circumferential gap. An induction hood having a portion that gradually widens downward is provided so as to communicate with the lowermost conduit, and the sand descending from the lowermost conduit is dispersed and guided to each of the above-mentioned downflow passages. A method for pouring sand into a water bottom, characterized in that the sand is dropped over a wide area from each opening grille formed by the lower surface of each of the flow channels at a substantially uniform flow rate.