JPS6037322A - Method and apparatus for preventing arching action of sand supply hopper - Google Patents

Abstract

PURPOSE:To continuously supply sand by preventing the occurrence of arching action by supplying sand while turning a rotator provided in the sand supply hopper. CONSTITUTION:When hollow rotators 17 provided in a sand supply hopper 5 are turned in the opposite direction, arching action phenomenon is avoided and even wet sand S can be smoothly sent onto a belt conveyer 6. Since the arching action of sand can be prevented when using sand drain method, sand paction method or underwater pack drain method, the continuous supply of sand from the lower charging port of the hopper can be attained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for preventing arch action in a sand supply hopper.

Conventionally, sand drain construction methods, sand compaction construction methods, underwater pack drain construction methods, etc. have been adopted as construction methods for improving soft ground such as the seabed. These construction methods use sand as a material, but this sand is in a wet state.

When such wet sand is put into the sand supply hopper and dropped from the sand outlet, the sand becomes clogged and bridged at the top of the hopper.

That is, an arch action occurs, causing a problem in which sand does not fall into the outlet, and sand cannot be continuously supplied, resulting in, for example, not being able to form a good sand column.

Therefore, the present invention solves the above-mentioned conventional problems.

The object of this invention is to provide a method and device for preventing arch action in a sand supply hopper that supplies sand in a wet state.

That is, the prevention method of the present invention is characterized in that a hollow rotary body consisting of only a skeleton is provided in the sand supply hopper, and sand is supplied while rotating the hollow rotary body. The device is constructed by providing a rotating body within a sand supply hopper.

An embodiment of the present invention will be described below with reference to the drawings. Fig. 1 is a side view of the overall arrangement of a sand column forming device equipped with a sand supply hopper to which the arch action prevention device of the present invention is applied;
FIG. 2 is a perspective view of the hollow rotating body in the sand supply popper of FIG. 1;

First, in the sand column forming apparatus shown in FIG. 1, water W exists inside the casing 2 when the casing 2 is driven into the soft ground 1 of the seabed to be improved. A sand bag 6 with a bottom is inserted into the casing 2 from the sand bag cassette 4, and a sand bag 6 is inserted into the sand supply hopper 5. The sand S supplied via the belt conveyor 6 and the chute 7 is introduced into the sand bag 6 via the hopper 10 together with the supply water W supplied from the supply water pipe 9 having the supply water adjustment valve 8. be.

As described above, the sand bag 6 into which the wet sand S containing the supply water W is introduced from the hopper 10 descends from the guide 11 provided at the top of the casing 2 into the casing 2 as an underwater pack P. The water W previously filled in the casing 2 below the sand bag B is gradually discharged out of the casing 2 via a drain pipe 16 having a discharge water adjustment valve 12, and the underwater pack P is accordingly and descends inside the casing 2.

In addition, 14 in FIG. 1 is a separated water receiver, and 15 is a separated water outlet.

As described above, the sand supply hopper 5 for supplying sand S is provided with the belt conveyor 6 at its lower drop-in port, but in this embodiment, the sand supply hopper 5 is equipped with a framework as shown in FIG. Two cylindrical hollow rotating bodies 17 each having a rotating shaft 18 are provided, and these hollow rotating bodies 17 are rotated in opposite directions as shown by arrow R in FIG. 2.

If the sand supply popper 5 of the present invention having such a configuration is provided, the above-mentioned arch action phenomenon can be eliminated by the hollow rotary bodies 17, and even sand S that is flat can be smoothly fed to the belt conveyor B. is completed, sand bag 6
It is possible to form an underwater pack P of continuous sand columns inside.

In the above embodiment, two hollow rotating bodies 17 are provided, but the number is not limited, and one or three or more may be provided, and the shape and direction of rotation are also particularly different from this embodiment. Furthermore, the hollow rotating body 17 may be replaced with a simple rotating body.

Therefore, in the sand supply hopper to which the present invention is applied, arch action in the hopper can be prevented even when the sand is in a wet state, and sand can be continuously supplied from the drop-in port below. There is.

[Brief explanation of drawings]

Fig. 1 is a side view of the overall arrangement of a sand column forming device equipped with a sand supply hopper to which the arch action prevention device of the present invention is applied, and Fig. 2 is a perspective view of the sand supply hopper of Fig. 1 and the hollow rotating body inside. It is. 5... Sand supply hottu'' par, 10... Hottuno<-, 1
7...Hollow rotating body, 18...Rotating shaft, S...Sand. Agent Patent attorney Shin Ogawa − Patent attorney Ken Teru Noguchi

Claims (1)

[Claims] 1. A method for preventing arch action of a sand supply hopper, which comprises providing a rotating body within the sand supply hopper and supplying sand while rotating the rotating body. 2. An arch action prevention device for a sand supply hopper, characterized in that a rotatable rotating body is provided in the sand supply hopper to supply sand.