JPH0444668Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a hopper part for a sandbag pillar forming device using the underwater pack drain method for forming sandbag pillars in soft ground such as the bottom of the sea or other bodies of water.

[Prior art]

Conventionally, the sand drain method using sand pillars has been widely adopted as a construction method for improving soft ground such as the seabed.

However, as the length of the sand pillar increases, there is a problem in construction as the sand pillar breaks during construction and becomes discontinuous or thin. Not only did it have a large diameter and required a large amount of sand, but the drain effect was unstable and its reliability was questionable.

Therefore, when a casing is driven into soft ground such as the seabed and a sand bag is dropped into the casing, the water below the sand bag inside the casing is discharged through a drain pipe by a pump.
The sandbag is deposited in soft ground such as the seabed, and the sandbag is deposited into the casing while adjusting the drainage amount to form a sandbag column, and then the casing etc. are removed leaving only the sandbag column. A method and device for forming pillars was invented in Japanese Patent Publication No. 53-16604, and is now in practical use as one of the most effective construction methods for underwater pack drain construction.

However, in the above-mentioned underwater pack drain method, it is necessary to continuously supply a constant amount of sand and water into the sand bag in order to form a good sand bag pillar. Arch action of sand is likely to occur in the hopper section that stores the amount of sand required for construction, and sand gets stuck in the hopper section and does not fall, making it impossible to continuously supply a constant amount of sand. .

Therefore, a screw conveyor connected in a spiral around the outer circumference of the rotating shaft is installed inside this hopper, but in this case, it only supplies sand, but lacks the ability to stir. There was a risk that sand would stick to itself.

[Purpose of invention]

Therefore, the present invention was devised to solve the above-mentioned conventional problems, and it is possible to destroy the arch action of sand in the hopper part of the sand bag pillar forming device using the underwater pack drain method, and to quantitatively remove sand. The purpose is to create a good sand column by continuously supplying sand.

[Structure of the idea]

That is, the hopper part for the sand bag pillar forming device of the present invention has a hopper part on the top of the casing that is driven into soft ground such as the bottom of the water, for supplying sand and supply water into the sand bag, and further has a hopper part that supplies sand and supply water into the sand bag. In a sand bag pillar forming device that forms a sand bag pillar by lowering a sand bag into a casing while discharging filled water, a rotating shaft and an upper part provided in the hopper part along the sand supply direction are provided. It is constructed by providing a screw conveyor which forms an agitating section having a gap with the outer periphery of the rotating shaft, and whose lower part forms a feeder section connected to the outer periphery of the rotating shaft.

〔Example〕

The details of the present invention will be explained below with reference to the drawings. Fig. 1 is an overall layout diagram of the sand bag column forming device provided with the hopper section of the present invention, and Fig. 2 shows the lower part of the hopper and cassette of Fig. 1. Enlarged side view showing the joint part of
The figure is an enlarged side cross-sectional view of the hopper portion of FIG. 1.

First, in the apparatus shown in FIG. 1, the casing 2 is filled with water W while the casing 2 is driven into soft ground 1 such as a water bottom to be improved.

Next, a water-shielding material 4 is inserted into the casing 2 in advance, and a sand bag 3 is inserted from above the water-shielding material 4, and the sand bag 3 is supplied via a belt conveyor, chute, etc. (not shown). The sand S is supplied from the hopper section 5.

A screw conveyor 6 for supplying a fixed amount of sand S is provided in this hopper section 5 in the sand S supply direction, that is, in the vertical direction, and this screw conveyor 6 is rotated by a motor 7. Further, the water supply pump 8 supplies the supply water W to the lower part of the screw conveyor 6 via the supply water pipe 15 having a flow meter 24, and the supply water W is supplied to the lower part of the screw conveyor 6 through the supply water injection nozzle 9.
The sand S is introduced into the sand bag 3 while being mixed with the sand S.

As described above, the lower part of the hopper section 5 is composed of the screw conveyor 6 and the supply water injection nozzles 9, etc.
A cassette 10 for a sandbag 3 as shown in FIG. 2 is provided between the upper part of the casing 2 and the bottom of the hopper portion 5. This cassette 10 is detachably connected to the lower end of the hopper portion 5 by a cassette connector 12.

Furthermore, a sand bag 3 with a bottom made of a water-permeable net or the like is compressed in the longitudinal direction and attached to the outer periphery of the cassette 10 in a bellows shape. It descends into the casing 2 filled with water W.

Furthermore, when the sand bag 3 supplied with sand S as described above descends into the casing 2, the casing 2
In order to drain the water W filled inside, one end of a drain pipe 14 having a drain valve 13 and a flow meter 24 is provided at the bottom of the casing 2, as shown in FIG.

On the other hand, two upper and lower sand surface detection sensors 18A, 18B are provided in the upper part of the casing 2 shown in FIG.
8B has a plurality of tactile switches that abut on the outside of the sand bag so as to make contact with the sand bag, and when the sand bag is filled with sand, the tactile switches are pressed and sensed.

That is, when the position of the upper end surface X of the sand column contacts the upper sand surface detection sensor 18A, that is, when the upper end surface X is located above this sand surface detection sensor 18A,
When the screw conveyor 6 and the water supply pump 8 in the hopper section 5 are stopped, and the position of the upper end surface X is not in contact with the lower sand surface detection sensor 18B, that is, the upper end surface X is Automatic control is provided by providing a control device 20 that closes the drain valve 13 of the drain pipe 14 when the drain is located lower.

In addition, the drain valve 13 is operated by an air cylinder controlled by a solenoid valve, and has two positions, set opening and fully closed, so that the opening and closing of the drain valve 13 can be made smoother by using the air cylinder in response to the complicated operation of the sensor described above. ing.

When applying the underwater pack drain method using the sand bag pillar forming device having the above configuration, the casing 2 is driven into the soft ground 1, and the water W filled in the casing 2 is discharged through the drain pipe 14. A sand bag 3 into which sand S and supply water W are introduced is lowered into the casing 2 to form a sand bag column, and after the formation of the sand bag column is completed, the casing 2 is pulled out leaving only the sand bag column. I will be leaving.

Therefore, in the present invention, sand S is placed in the hopper part 5.
As shown in FIG. 3, on the outer periphery of a rotating shaft 21 that rotates the screw conveyor 6 provided vertically along the feeding direction of A screw conveyor 6 whose lower part is connected to the outer periphery of the rotating shaft 21, that is, forms a feeder portion 23 without a gap.
has been established.

By providing the screw conveyor 6 as described above along the supply direction of the sand S in the hopper section 5, the stirring section 22 at the upper part of the screw conveyor 6 has a gap between it and the rotating shaft 21. The stirring part 22 functions as a stirring blade, and can destroy the arch action of the sand S generated in the hopper part 5.
The feeder section 23 at the bottom can continuously supply a fixed amount of sand S.

It is also possible to set an arbitrary supply amount by changing the rotation speed of the motor 7 for driving the screw conveyor 6 using an inverter.

[Effect of idea]

Therefore, if the present invention is applied to the hopper part of a sand bag pillar forming device using the underwater pack drain method, it is possible to prevent the arch action of sand that occurs in the hopper part and to continuously supply sand quantitatively. As a result, it is possible to create good sandbag pillars.

[Brief explanation of the drawing]

Fig. 1 is an overall layout view of the sand bag pillar forming device provided with the hopper section of the present invention, Fig. 2 is an enlarged side view showing the joint between the lower part of the hopper section and the cassette in Fig. 1, and Fig. 3
The figure is an enlarged side view of the hopper section of FIG. 1. 1... Soft ground, 2... Casing, 3... Sand bag, 5... Hopper section, 6... Screw conveyor, 10... Cassette, 14... Drain pipe, 21...
... Rotating shaft, 22 ... Stirring section, 23 ... Feeder section, C ... Gap, S ... Sand, W ... Supply water.

Claims (1)

[Scope of utility model registration request] The casing, which is driven into soft ground such as the water bottom, has a hopper part on the top that supplies sand and supply water into the sand bag, and the sand bag is lowered into the casing while draining the water that has filled the casing. A sand bag pillar forming device for forming sand bag pillars includes a rotating shaft provided in the hopper part along the sand supply direction, an upper part forming a stirring part having a gap with the outer periphery of the rotating shaft, and a lower part forming a sand bag pillar forming apparatus. A hopper section for a sand bag pillar forming device, characterized in that a screw conveyor forming a feeder section connected to the outer periphery of a rotating shaft is provided.