JPH0512351Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention relates to a sand pouring device to the underwater bottom that is used for works such as laying sand, filling sand, and replacing sand in underwater structure construction work. .

(Problems to be solved by the prior art and the invention) The inventor of the present application points out that the conventional method of directly dumping sand into water causes a large loss of sand, and especially when the water depth is deep, the amount far exceeds the required amount. Various disadvantages include the uneconomical nature of large amounts of sand being scattered around, the inability to efficiently lay and fill sand in a specified flat form, and the muddying of surrounding water due to large amounts of sand being scattered around. We have already researched and developed a sand pouring device to solve this problem.

In other words, the lower end of the upper pipe is slightly inserted into the upper end of the lower pipe with a larger diameter, and the conduit is connected in several stages so as to form an appropriate gap between the upper pipe and the lower pipe. The upper end of the uppermost conduit is located slightly below the water surface, and the interior of the lowermost conduit is partitioned into multiple flow passages that gradually widen downward. An ejector function in which the hopper is held vertically in the water so that its lower end is slightly above the water bottom, and the lower part of the discharge port of the hopper is inserted into the upper end of the uppermost conduit to form a gap there. This is a device that pours sand into the bottom of the water using downward water flow.

However, as a result of repeated experiments and research tests using actual use, the present inventors found that the sand thrown into the hopper passes through the discharge port and is attached to each conduit by the downward water flow induced by the ejector action. There is no problem when the sand is continuously poured under pressure, but when the continuous sand pouring operation is temporarily interrupted, for example, for a short period of time after the hopper is empty and before the next sand is poured in. In addition, in each gap, especially in the gap between the uppermost conduit and the hopper outlet, the water flow backflows from the lower side of the inner side of the conduit to the upper side of the outer side of the conduit. It has been discovered that backflow water contaminated with sand, especially in the case of poor sand quality, can cause water flow containing mud to flow backwards, polluting the water quality of nearby water areas.

(Means for Solving the Problems) This invention was made to solve the above problems, and the sand pouring device of this invention will be described in detail below with reference to the drawings. 1 is the lower end of the upper pipe. This is a conduit that passes slightly into the upper end of a lower end tube with a larger diameter than that, and is connected in several stages so as to form an appropriate circumferential gap s between the upper end pipe and the lower end pipe. In the embodiment shown in FIG. 1, a guide hood 6 is connected to the lowermost conduit 1 and has a portion inside which is divided into a plurality of flow passages 7 and gradually widens downward.
The embodiment shown in FIG. 2 shows the case where nothing is provided at the lower end of the lowermost conduit 1. Further, the above-mentioned upper and lower conduit pipes 1, 1 are connected by a chain 2, respectively.
Then, the uppermost conduit 1 is held vertically in the water so that its upper end is slightly below the water surface 3, and the induction hood 6 provided in communication with the lowermost conduit 1 or the lower end of the lowermost conduit 1 is slightly above the water bottom 8, respectively. do. Further, the lower part of the outlet 5a of the hopper 5 is inserted into the upper end of the uppermost conduit 1 and held vertically so as to form a circumferential gap a therein. In FIGS. 1 and 2, reference numeral 4 denotes a work boat, and a hopper 5 is held by the frame of the work boat 4, and each conduit 1 and the like are also held vertically. When sand is thrown into the hopper 5 by the grab of a sand carrier, the sand is transferred to the discharge port 5.
a, the sand is continuously dropped into the conduit 1 through the gap s from the upper end opening of the uppermost conduit 1 and the openings of each stage connection part by the ejector action as the sand falls. The structure is such that the sand is energized by a downward water flow induced to flow into the sand and descends and flows into the water bottom 8 from the lower end of the guide hood 6 or the lowermost conduit 1. The above is a sand pouring device that has already been researched and developed by the inventor of the present application.

Therefore, this invention provides a check valve 10 made of hard rubber fin valve plates 10a and 10b in each of the circumferential gap s zones, especially in the circumferential gap s zone between the uppermost conduit 1 and the outlet 5a of the hopper 5. It is something that has to be worn.
The non-return valve 10 may include, for example, fin valve plates 10a and 10b made of hard rubber as shown in FIG.
using the hopper 5 to attach one fin valve plate 10a to the hopper 5.
and the other fin valve plate 10b is attached to the upper inner circumferential surface of the uppermost stage conduit 1 (outer tube) by means of fasteners 9, respectively. In Fig. 3, the sand 11 in the hopper 5 is
When the sand flows down, a water flow is induced in the circumferential gap s in the downward direction of the arrow by the ejector action, which forces the sand 11 to descend. When the descent into the conduit 1 of No. 11, that is, the sand pouring, is temporarily interrupted, a reaction action of the descending sand flow is instantaneously induced, and the sand flows upward in the direction opposite to the arrow in the above-mentioned circumferential gap s. This is caused by a turbid stream of water mixed with water being blown up. However, at this time, the fin valve plates 10a and 10b are deformed as shown by the chain lines in FIG.
is in a closed state to prevent the above-mentioned turbid water from flowing out through the gap s. The above-mentioned backflow phenomenon of polluted water is particularly noticeable in the uppermost stage circumferential gap s, so the above-mentioned backflow prevention valve 10 is installed in the circumferential gap s between the uppermost conduit 1 and the discharge port 5a of the hopper 5. is indispensable, but since backflow is slight in the lower circumferential gap s other than that, it is necessary to stop installing it as shown in the lower circumferential gap s in Figure 2, or to remove the lowermost circumferential gap s in Figure 1. It is also possible to attach only one fin valve plate 10b as shown in FIG.

(Effect of the invention) As mentioned above, this device is a device for pouring sand into the water bottom using a downward water flow due to ejector action.
A check valve 1 is installed in the circumferential gap s zone between the discharge port 5a of the
0, the backflow of polluted water muddy with sand through the gap s is effectively and appropriately prevented when the downflow or inflow of sand is temporarily interrupted. It has an excellent effect of preventing water pollution in water bodies. Further, since a hard rubber fin valve plate is used as the check valve 10, it is possible to expect a simple structure, reliable and smooth valve function, and it can be provided at a low cost.

[Brief explanation of the drawing]

The drawings show an embodiment of the invented device; FIG. 1 is a longitudinal sectional front view, FIG. 2 is a longitudinal sectional front view of another embodiment, and FIG. 3 is an enlarged longitudinal sectional front view of the main parts. 1... Conduit, 2... Chain, 3... Water surface, 4...
...Work boat, 5...Hopper, 5a...Discharge port, 6
...Induction hood, 7...Outfall path, 8...Bottom, 9
...Stopper, 10...Return prevention valve, 10a, 10b
...fin valve plate, 11...sand, s...periphery.

Claims (1)

[Scope of utility model registration request] A conduit 1 that is connected in several stages so that the lower end of the upper pipe passes slightly into the upper end of the lower pipe with a larger diameter, and an appropriate circumference S is formed between the upper pipe and the lower pipe. The upper end of the uppermost stage conduit 1 is located slightly below the water surface 3, and the interior of the uppermost stage conduit 1 that communicates with the lowermost stage conduit 1 is partitioned into a plurality of flow passages 7, which gradually become wider downward. It is held vertically in the water so that its lower end is slightly above the water bottom 8, and the lower part of the outlet 5a of the hopper 5 is inserted into the upper end of the uppermost stage conduit 1 to form a circumference S in that part. In a device for pouring sand into the water bottom using a downward water flow due to an ejector action, the sand is poured into the bottom of the water using a downward water flow caused by an ejector held in the hopper. A device for pouring sand into the water bottom, which is equipped with a backflow prevention valve 10.