JPH0447235Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a sandbag mounting cylinder for a sandbag pillar forming device that forms sandbag pillars in soft ground such as the ocean floor or other soft ground such as the water bottom.

[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, problems arise during construction, such as sand cutting in the sand pillar, making it discontinuous or becoming thinner. 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.

In this construction method, a sand bag installation tube is installed on the top of a casing that is driven into soft ground to lower sand bags into the casing, and the sand bags are compressed in the longitudinal direction and attached to the outer circumference of this installation tube in a bellows shape. Sand and supply water are mixed and introduced into the sandbag with a bottom through the hopper at the top of the mounting cylinder to form a sandbag column, and the sandbag column descends inside the casing. However, during the formation of sandbag pillars, the sandbag attached to the outer periphery of the mounting tube is pulled from below and slips off, or falls freely and sag, which prevents the formation of good sandbag pillars. There's a problem.

[Purpose of invention]

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned conventional problems and to prevent the sand bags attached to the outer periphery of the cassette of the sand bag column forming apparatus using the underwater pack drain method from slipping down.

[Structure of the idea]

The present invention includes a sand bag mounting tube that allows sand to be lowered into the casing on top of a casing that is driven into soft ground such as the bottom of the water, and supplies sand and supply water into the sand bag via the mounting tube. In a sand bag column forming device that has a hopper part and further forms a sand bag column by lowering the sand bag into the casing while discharging the water filled in the casing, friction is applied to the lower outer periphery of the sand bag mounting cylinder. It consists of a sand bag mounting cylinder of a sand bag pillar forming device, which is characterized by having a body attached thereto.

〔Example〕

The details of the present invention will be explained below with reference to the drawings, and FIG.
The figure is an enlarged side view showing the joint between the lower part of the hopper part in Fig. 1 and the sand bag mounting cylinder, Fig. 3 is an enlarged side sectional view of the hopper part in Fig. 1, and Fig. 4-A is the figure shown in Fig. 1. 4-B is a side view of FIG. 4-A, FIG. 5 is an enlarged plan sectional view of the tactile switch of FIG. 4-A, and FIG. The figure is an enlarged side sectional view of the main part of the sand bag mounting tube.

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.

This hopper part 5 has sand S as shown in FIG.
A screw conveyor 6 for supplying a fixed amount of sand S is provided in the feeding direction of the sand S, that is, in the vertical direction, and this screw conveyor 6 is rotated by a motor 7. Supply water W is passed through a supply water pipe 15 having a flow meter 21
The sand S is supplied to the lower part of the screw conveyor 6 via the
The sand S is introduced into the sand bag 3 while being mixed.

As mentioned above, the lower part of the hopper section 5 consisting of the screw conveyor 6, the supply water injection nozzle 9, etc.,
2 and 6 between the upper part of the casing 2 and the upper part of the casing 2.
A sandbag mounting cylinder 10 shown in the figure is provided, and this mounting cylinder 10 has a hopper portion 5 as shown in Fig. 2.
It is removably connected to the lower end of the cylinder by means of a mounting cylinder joint 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 mounting tube 10 in a bellows shape, and when the sand S is introduced,
The weight of the sand S causes it to descend into the casing 2 filled with water W.

Note that an air tube 16 and a protective rubber plate 17 are attached to the lower part of the mounting tube 10 to prevent the sand bag 3 from slipping down.

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, a drain pipe 14 having a drain valve 13 and a flow meter 21 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, as shown in FIGS. 4-A and 4-B, each has three tactile switches 19 shown in FIG. The upper end surface of the sand column indicated by arrow X in the figure can be detected.

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 supply water 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, when the upper end surface 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.

The drain valve 13 is operated by an air cylinder controlled by a solenoid valve and has two positions: a set opening and a fully closed position.The air cylinder is used to open and close the drain valve 13 in response to the complicated operation of the sensor. It's smooth.

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 removed leaving only the sand bag column. It turns out.

As described above, in the present invention, the air-filled tube 16 is attached to the outer periphery of the lower part of the sand bag mounting cylinder 10 by fitting, and the amount of air inside this tube is adjusted in advance so that the outer periphery of the air-filled tube 16 is adjusted. By generating frictional resistance between the surface and the inner surface of the sandbag 3, the sandbag 3 is made to have more uniform tension than the inside.

As a result, the free fall of the sand bag 3 and the sagging of the sand bag 3 during sand bag construction are prevented, so that the air tube 16 functions as a brake device for the sand bag 3.

In this embodiment, the outer periphery of the air tube 16 is covered with a cylindrical protective rubber plate 17, and the upper end thereof is adhered to the mounting tube 10, so that the air tube 16 is not in direct contact with the sandbag 3. It has a function to prevent it from being pulled downward and falling off. Note that the friction body attached to the lower outer periphery of the sandbag mounting tube is not limited to an air-filled tube, and may be any type as long as it has a friction function.

[Effect of idea]

Therefore, if the sandbag mounting tube of the present invention is applied to a sandbag pillar forming device using the underwater pack drain method, the sandbags attached in a bellows-like manner around the outer circumference of the mounting tube will not be pulled down from below and slip off, or will fall by themselves. This can be prevented by the friction body provided on the mounting tube, and furthermore, it is possible to prevent the sand bag from sagging during the construction of the sand bag pillar, which has the effect of making it possible to form a good sand bag pillar.

[Brief explanation of drawings]

Fig. 1 is an overall layout diagram of a sandbag pillar forming device in one embodiment to which the sandbag mounting cylinder of the present invention is applied, and Fig. 2 is a joint between the lower part of the hopper part shown in Fig. 1 and the sandbag mounting cylinder. FIG. 3 is an enlarged side sectional view of the hopper part in FIG. 1, FIG. 4-A is a plan sectional view in the A-A direction of the sand surface detection sensor in FIG. 1, and FIG. 4-B The figure is number 4
-A is a side view, FIG. 5 is an enlarged plan sectional view of the tactile switch shown in FIG. 4-A, and FIG. 6 is an enlarged sectional view of a main part of the sandbag mounting tube. 1... Soft ground, 2... Casing, 3... Sand bag, 5... Hopper part, 10... Sand bag mounting tube, 16
...Pneumatic tube, 17...Protective rubber plate, S
...Sand, W...Supply water.

Claims (1)

[Scope of utility model registration request] At the top of the casing to be driven into soft ground such as the bottom of a water, there is provided a sand bag mounting tube that can lower sand into the casing, and a hopper section that supplies sand and supply water into the sand bag via the mounting tube. In the sand bag pillar forming device, which forms a sand bag pillar by lowering the sand bag into the casing while discharging the water filled in the casing, a friction body is attached to the outer periphery of the lower part of the sand bag mounting cylinder. A sandbag mounting tube of a sandbag column forming device characterized by: