JPH0210938Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a concrete block, and more particularly to a concrete block for fixing an aquaculture facility.

Aquaculture facilities for seaweeds such as wakame and kelp, and fish such as salmon and yellowtail are fixedly installed in the sea for long periods of time, and cannot be moved during stormy weather. Therefore, consideration should be given to the large force generated by energy from waves and ocean currents. It is necessary to increase the fixing force of the facility itself.

Concrete blocks have conventionally been used as a fixing means for this aquaculture facility. Concrete blocks have low material costs, can be easily manufactured near the site of use, and unlike fixed net rings, sand bags, claw anchors, etc., there is little loss of fixing force even when the angle between the seabed and the anchor line is large. , the anchor line can be shortened,
Another advantage is that the sea surface for aquaculture can be used effectively.

However, conventional concrete blocks of this kind have been simply constructed in the shape of a cube, have an anchor cable connecting member fixedly attached to the top, and are simply installed on the seabed, which has caused the following problems.

In other words, the specific gravity of concrete is about 2.5,
Considering that the anchoring force of an anchor is proportional to its underwater weight, a large anchor is required to obtain a large anchoring force. In addition, aquaculture often uses the sea surface at a depth of 50 meters or less, and although the waves generated are shallow sea waves, they combine with ocean floor currents to wash away the sand and mud around the sunken blocks.
Conventional concrete blocks have no effect on this phenomenon even if they are made larger, so they tend to tip over and cause anchor rope breakage accidents. In addition, the inclination of the blocks changes the coefficient of friction, reducing the fixing ability and making it impossible to obtain the desired force, which may cause local movement of the aquaculture facility and cause an accident involving the entire facility.

Regarding concrete blocks, it was
-4 of the block body with a square plane in the publication No. 1617
It has been proposed that legs are formed at the corners, a protrusion is formed in the center of the top surface, a recess is formed at the edge between the legs, and communication holes are formed in the protrusion and both sides of the protrusion. According to this, the waves flow through the openings between the legs and through the circulation holes, which has some effect on dissipating waves and forming water currents for aquaculture, but it only touches the seabed at the four corner legs. Therefore, it tends to tilt, which can cause the anchor rope to break or change the coefficient of friction, resulting in a weak fixing force. Therefore, despite the complicated structure and high production costs, there was a problem that it was not practical for use as a fixing device for aquaculture facilities.

This invention solves the problems of conventional concrete blocks for fixing aquaculture facilities as mentioned above, has a relatively small and simple structure, has a high fixing force, and effectively prevents tilting and overturning due to surrounding sand and mud being washed away by water currents. The purpose is to provide concrete blocks that can be used.

In order to achieve this purpose, the present invention is a concrete block that is installed on the seabed as a means of securing an aquaculture facility.In addition to providing a ring for connecting the anchor cable on the top of the concrete block body, the present invention also includes a surrounding wall at the bottom. A recess is formed, and the concrete block body is further provided with a tubular body for fluid pressure injection whose rear end protrudes from the concrete block body and whose tip reaches the recess, and at a different position from this tubular body, one end is formed into the recess. A through hole is provided for draining the sand and mud inside the recess, which has been scoured by the fluid ejected from the tubular body, to the outside.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 to 4 show an embodiment of the concrete block according to the present invention, where A is the concrete block of the present invention and B is the seabed. Reference numeral 1 denotes a concrete block main body, which is configured into a cube or other arbitrary shape.

Reference numeral 2 denotes a recessed portion of a required depth provided at the bottom of the concrete block main body 1, around which a surrounding wall 6 is formed. Reference numeral 3 denotes a through hole provided at a suitable location, for example, approximately at the center of the concrete block body 1, one end of which communicates with the recessed portion 2, and the other end opening into the upper surface of the concrete block body.

4 is a tubular body for press-fitting fluid whose rear end protrudes from the block body. This tubular body 4 is located at the entrance level of the recess 2, that is, at the concrete block body 1.
It is preferable that the protrusion is equal to or higher than the level of the bottom surface 7 of the. It is preferable that the tubular body 4 penetrates the concrete block body 1 in the height direction as shown in the figure, but it may be led out from the side wall of the concrete block body 1 in some cases.

The tubular body 4 may be inserted integrally into the concrete block main body 1 during molding, or a through hole may be formed in the concrete block main body 1 and the tubular member 4 may be inserted through the concrete block main body 1 when necessary.

A plurality of through holes 3 and tubular bodies 4 may be provided as necessary, and the tubular body 4 may be provided with a connecting portion for connecting a fluid supply pipe at the rear end.

Reference numeral 5 denotes a ring for connecting an anchor cable provided on the upper part of the concrete block body 1.

Next, the usage and operation of the concrete block of the present invention will be explained.

Concrete block A according to this invention is a ship C
After the concrete block body 1 is loaded onto the concrete block and transported to a predetermined sea surface, and a fluid conduit 8 such as a water pipe is connected to the rear end of the tubular body 4, the concrete block body 1 is suspended by an appropriate means such as a crane and sent to the seabed B. Place it in place.
The anchor rope is also connected to the ring 5 on board the ship in the same way as the fluid conduit.

After confirming that the concrete block body 1 has landed on the bottom, the fluid conduit 8 is connected to the pumps (not shown) on the ship.
Connect it to the pump and operate the pumps to forcefully pump fluid such as seawater.

In this way, the fluid is supplied from the fluid conduit 8 to the tubular body 4, and since the tip of the tubular body 4 has reached the recess 2 provided at the bottom of the concrete block body 1, the fluid in the recess 2 is As shown in FIG. 6, sand and mud at the bottom of the concrete block body 1 are thrown up by the ejection pressure and are discharged to the outside from the through hole 3 opening in the recessed part 2. Therefore, by continuing the fluid pumping for the required time, the sand and mud layer directly under the concrete block body 1 is removed.
Due to the disappearance of B', the concrete block body 1 is buried to the required depth due to its own weight. After embedding to a predetermined depth, the fluid conduit 8 is disconnected.

In this way, the concrete block main body 1 is not simply placed on the seabed, but the bottom area of the block is buried in the seabed, so even if a water current hits the seabed and the sand and mud around the block is washed away, The concrete block body 1 is less likely to tilt or fall, and good fixing ability can be maintained.

When the outflow of surrounding sand and mud increases, fluid can be forced into the tubular body 4.
As a result, the sand and mud immediately below the concrete block main body 1 are scoured again, and the ability to prevent tilting and falling is restored.

The results of a practical study conducted by the inventor are as follows. Length L = 3.7m, Width W = 2.7m, Height H
= 1.5m concrete block body, length l
= 2.5 m, width w = 1.8 m, depth h = 0.1 m, a through hole with a diameter of 0.2 m is formed approximately in the center of the concrete block body, and a tubular hole is formed at a position 0.1 m from the outer periphery. A pipe (gas pipe) with an outer diameter of 30 mm and a wall thickness of 0.5 mm is installed so that the tip protrudes 0.2 m from the bottom of the concrete block body, and a nylon rope with a diameter of 40 mm for reinforcement is inserted inside.
A concrete block weighing approximately 30 tons was obtained by installing a ring using a mm car tire.

Place this concrete block on the ocean floor,
I tried pumping seawater using atmospheric pressure and ejecting it from a tubular body. Then, hold the anchor rope twice as deep as the water depth, and set the angle of the anchor rope to twice the depth of the water.
The fixing force was measured at 45°.

As a result, while the fixing force of a conventional concrete block of the same weight was 18 tons, the concrete block of the present invention had a fixing force of 30 tons, which was about 1.7 times better. This shows that the present invention can provide the same fixing force with a smaller device.

According to the present invention explained above, the ring 5 for connecting the anchor rope is attached to the upper part of the concrete block body 1.
In addition to connecting it to the seabed by installing a wall 6 at the bottom,
A recessed part 2 is formed so as to have the following properties, and a tubular body 4 for press-fitting fluid is provided, the tip of which reaches the recessed part 2 and the rear end of which protrudes from the concrete block main body 1.
In addition, a through hole 3 is provided at a position different from the tubular body 4, with one end leading to the concave part 2 and for discharging to the outside the sand and mud in the concave part scoured by the fluid ejected from the tubular body 4. , the sand and mud under the recessed part 2 can be intensively and efficiently discharged, and this together with the concrete block's own weight can cause the concrete block main body 1 including the surrounding wall part and the recessed part to
The bottom area of the vessel can be stably buried in the seabed. Therefore, even if the sand and mud around the block is washed away by water currents on the seabed, the concrete block will not tilt or overturn, and it can exhibit good fixing force despite its small size. Moreover, it has a simple structure and can be manufactured at a relatively low cost, which is an excellent effect.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing how the concrete block according to the invention is used, Fig. 2 is a plan view showing an example of the concrete block according to the invention, and Fig. 3 is a sectional view showing the concrete block according to the invention.
Figure - Sectional view along the line, Figure 4 is Figure 2 -
5 and 6 are explanatory diagrams illustrating the process of sinking the concrete block of the present invention. DESCRIPTION OF SYMBOLS 1... Concrete block main body, 2... Recessed part, 3... Through hole, 4... Tubular body, 5... Ring, 6... Surrounding wall.

Claims (1)

[Scope of utility model registration request] In a concrete block installed on the seabed as a means of fixing an aquaculture facility, a ring 5 for connecting an anchor cable is provided on the upper part of the concrete block body 1, and a recessed part 2 is formed in the bottom part so as to have a surrounding wall 6. Concrete block body 1
, there is a tubular body 4 for press-fitting fluid whose rear end protrudes from the concrete block body 1 and whose tip reaches the recessed part 2.
A through hole 3 is provided at a position different from the tubular body 4, and one end of which is connected to the concave part 2 and for discharging sand and mud in the concave part scoured by the fluid ejected from the tubular body 4 to the outside. A concrete block characterized by the following: