JPH11296068A - Device and method for sand fall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a prescribe soil body structure with uniform distribution obtainable by arranging a supplier with groove on a hopper for storing soil, and depositing soil in the groove of the supplier inside a soil vessel. SOLUTION: A soil vessel 3 and the sand fall device 2 are arranged on a load stand installed at the end of a beam through a supporting point. When the beam is rotated, centrifugal force acts on the sand fall device 2 and the soil vessel 3 without interruption. The sand fall device 2 is provided with a hopper 21 arranged on a rail 24 and a motor 27 for horizontally moving the hopper to move the hopper 21 on a rail at the opening part of the soil tub 3. In this case, when sand is stored in the hopper 21 and a supplier 23 with groove arranged at a nozzle part 22 of the hopper 21 is rotated, the sand in the groove of the supplier 23 falls from the nozzle part 22 of the hopper 21 into the soil tub 3. In this case, the fall of sand is movement in the axial direction of the beam with the centrifugal force based on the rotation of the beam. Thus, banking 31 is constructed on the existent foundation 30 inside the soil vessel 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sand removal device used for soil tests and the like.

[0002]

2. Description of the Related Art As shown in FIG.
A hopper a for storing soil disposed in the opening of the earthen tub d;
Slide slit b arranged between earthen tub d and hopper a
It has.

A large number of partition plates c are arranged in the hopper a to divide the hopper a into a plurality of spaces. The soil such as sand is stored in a predetermined pattern in the separated space. For example,
As shown in FIG. 6, it is stored in a space that is previously partitioned so as to form a trapezoid.

When the centrifugal force is applied to the soil by the centrifugal loading device, the slide slit b is shifted to open a slit-shaped opening at the bottom of the hopper a, so that the trapezoidal pattern stored in the hopper is formed. The soil falls into the earthen tub d, and the trapezoidal earth structure e can be formed in the earthen tub.

However, as shown in FIG. 6, the soil structure e often has irregularities in the depth direction f (the direction along the partition plate). Due to this, the state of stress in the depth direction generated in the ground immediately below the earth structure will be different,
In the plane strain state, the phenomenon of the earth structure e cannot be considered.

[0006]

<A> The present invention is to obtain an earth structure having a uniform distribution. <B> The present invention is to obtain an earth structure having a predetermined shape.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a centrifugal force loading apparatus for reproducing the stress state of actual ground on a model ground in an earthen tub by centrifugal force, and a hopper for storing soil and a groove arranged in the hopper. A sanding device, or a model ground in a soil tank, wherein the state of stress in the actual ground is measured by centrifugal force. In the centrifugal force loading device that reproduces the hopper, a hopper that stores the soil, a grooved feeder disposed in the nozzle part of the hopper is provided, and the feeder is rotated, and the soil that has entered the groove of the feeder is removed by the hopper. In a sand-dropping device, or a centrifugal loading device that reproduces the stress state of the actual ground on the model ground in the earthen tank by centrifugal force, characterized in that it is deposited in the earthen tank from the nozzle, at the opening of the earthen tank With a hopper that can be moved A feeder with a groove arranged in the nozzle portion of the hopper, and moving the hopper and rotating the feeder to deposit soil in the groove of the feeder into the earth tank from the nozzle portion. Using a sanding device or a sanding device equipped with an earth tank mounted on a loading platform at the end of the beam and a grooved feeder arranged at the nozzle part of the hopper, In the centrifugal force loading method that reproduces the stress state of the actual ground on the model ground in the earth tank by the centrifugal force generated by rotating,
The soil is supplied from the groove of the supply body into the earthen tub at a position shifted in the direction of rotation of the beam from a predetermined deposition position in the earthen tub, Using a sand dropper equipped with an earth tank mounted on the loading platform at the end and a grooved feeder arranged at the nozzle of the hopper, the centrifugal force generated by rotating the beam causes In the centrifugal force loading method that reproduces the stress state on the model ground in the earthen tank, when the hopper is repeatedly moved back and forth while feeding the soil from the groove of the supply body into the earthen tank,
The method for constructing an earth structure is characterized in that the moving position of the hopper is shifted to a position closer to the beam rotating direction than a predetermined accumulation position in the earth tank.

[0008]

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

<A> Centrifugal Loading Device The centrifugal loading device 1 is, for example, as shown in FIG. 1, an earth tank 3 and a sand dropping device on a loading table 6 which is installed at the end of a beam 4 via a fulcrum 5. 2 is arranged. When the beam 4 rotates, the position of the loading platform 6 changes from the position M to the position N, and the centrifugal force acts on the sand-dropping device 2 and the earth tank 3, and the centrifugal force is constantly applied to the sand-dropping device 2 and the earth tank 3. Works.

<B> Sanding device The sanding device 2 is, for example, as shown in FIG. 2, arranged at the opening of the earthen tub 3 to drop soil, for example, sand, in the earthen tub 3 in a predetermined pattern. . The sanding device 2 is a rail 2
And a hopper horizontal movement motor 27 for moving the hopper 21 on the rail at the opening of the earthen tub 3.

The hopper horizontal movement motor 27 is, for example, shown in FIG. 2 before and after the hopper 21 (in FIG. 2, right and left).
The timing belt 25 is connected to the
The hopper 21 can be controlled to move back and forth on the rail 24 by rotating the hopper 5 forward and backward. Thereby, the moving speed and moving direction of the hopper 21 are arbitrarily controlled.

<C> Hopper The hopper 21 stores the sand, drops the sand from the nozzle portion 22 of the hopper 21, and builds the embankment 31 on the existing ground 30 in the earthen tub 3.

The nozzle section 22 is provided with a columnar supply body 23 having a groove. The groove 231 is provided in the supply body 2 as shown in FIG.
3 are formed in the axial direction, and plural pieces are formed on the circumference.

The sand stored in the hopper 21 enters the groove 231 of the feeder 23, moves to the outside of the hopper 21 by the rotation of the feeder 23, and falls into the earth tank 3. The grooves 231 allow sand to be evenly deposited in the depth direction of the earthen tub 3.

The rotation of the supply body 23 is controlled by a driving device such as a supply body rotation motor 26. The amount of soil supplied can be adjusted by the rotation speed of the supply body 23.

Hereinafter, a method of constructing an earth structure using a sand remover under a centrifugal load will be described.

<A> Rotation of Beam When the beam 4 is rotated clockwise in the state shown in FIG. 1, the sand remover 2 and the earthen tub 3 are centrifugally moved, and the loading table 6
To move from position M to position N.

FIG. 2 shows that the sand remover 2 and the earthen tub 3 are under the action of centrifugal force, the paper surface is the upper surface (horizontal surface),
3 shows a state in which the axis 3 is perpendicular to the plane of the paper (up-down direction) and is rotating leftward (arrow W direction).

<B> Sand Drop Motion The sand is stored in the hopper 21 and the supply body 23 is rotated (rotated).
Then, the sand that has entered the groove 231 of the supply body 23 falls into the earth tank from the nozzle part 22 of the hopper. Here, the falling of the sand means that the sand 4 moves in the axial direction of the beam 4 due to the centrifugal force caused by the rotation of the beam 4. Specifically, when viewed from the rotating system, the sand is rotated in the direction of rotation of the beam 4 by the Coriolis force. In the opposite direction (counterclockwise) to draw a curve 28 and make a falling motion.

<C> Movement of the sand remover While rotating the feeder 23 of the hopper 21 at a constant speed, the hopper is moved in parallel (sliding) on the rail as shown in FIG. In FIG. 4, the point 0 is the earthen tub 3 (of FIG. 2).
The hopper 21 is moved from the center to the right (in the direction opposite to the arrow W) by a distance of 170 mm while dropping sand. Next, the hopper 21 is turned to the left and moved 145 mm. Such an operation is repeated as shown in FIG.

By the operation of FIG. 4, the earth structure of the embankment 31 can be built on the existing ground 30 as shown in FIG. It should be noted that the movement pattern in FIG. 4 is determined in consideration of the Coriolis force exerted on the falling sand. Since the sand dropping device 2 can control the amount of falling sand and the moving speed and direction of the hopper 21,
An embankment 31 having an arbitrary pattern can be formed. Further, since the sand is dropped using the groove 231 of the supply body 23, the distribution of the earth tank 3 in the depth direction 32 (the axial direction of the supply body 23) can be made flat.

[0022]

According to the present invention, the following effects can be obtained. <A> The embankment distribution in the depth direction of the earthen tub can be made uniform. <B> Since the movement of the hopper and the rotation of the feeder can be controlled, a soil structure having a free shape can be constructed.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a centrifugal loading device.

Fig. 2 Arrangement diagram of sand-dropping device and earth tank

FIG. 3 is a structural view of a supply body.

FIG. 4 is a movement control diagram of a hopper.

FIG. 5 is a structural diagram of an earth structure.

FIG. 6 is a layout diagram of a conventional hopper and earth tank.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Centrifugal loading device 2 ... Sanding-off device 21 .. Hopper 22 .. Nozzle part 23 .. Supply body 231. Groove 24 .. Rail 25 .. Timing belt 26 .. Supply body rotation motor 27.・ Motor for horizontal movement of hopper 28 ・ ・ Curve 3 ・ ・ ・ Soil tank 30 ・ ・ Existing ground 31 ・ ・ Embankment 32 ・ ・ Depth direction 33 ・ ・ Right wall of earth tank 4 ・ ・ ・ Beam 5 ・ ・ ・ Support point 6 ・..Loading platforms

Claims (5)

[Claims] 1. A centrifugal force loading device for reproducing a stress state of an actual ground on a model ground in an earthen tub by centrifugal force, comprising: a hopper for storing soil; and a grooved feeder disposed in the hopper. A sand-dropping device characterized by depositing soil in a groove of a supply body in an earthen tank. 2. A centrifugal force loading device for reproducing a stress state of an actual ground on a model ground in an earth tank by centrifugal force, comprising: a hopper for storing soil; and a grooved feeder disposed in a nozzle portion of the hopper. A sand removing device, comprising: rotating a supply body, and depositing soil in a groove of the supply body from a nozzle of a hopper into an earth tank. 3. A centrifugal force loading device for reproducing a stress state of the actual ground on a model ground in an earthen tank by centrifugal force, wherein the hopper is movably arranged at an opening of the earthen tank, and is arranged at a nozzle part of the hopper. And a feeder with a groove, wherein the hopper is moved and the feeder is rotated to deposit soil in the groove of the feeder from a nozzle portion into an earth tank, . 4. Generated by rotating a beam using a sand dropper equipped with an earth tank mounted on a loading table at an end of the beam and a grooved feeder arranged in a nozzle portion of a hopper. In the centrifugal force loading method that reproduces the stress state of the actual ground on the model ground in the earthen tank due to the centrifugal force, the position where the soil is supplied from the groove of the feeder into the earthen tank is a beam from the planned deposition position in the earthen tank A method of constructing an earth structure, wherein the earth structure is shifted to a position in a rotational direction of the earth. 5. Generated by rotating a beam using a sand dropper equipped with an earthen tub mounted on a loading table at an end of the beam and a grooved feeder arranged in a nozzle portion of a hopper. In the centrifugal force loading method that reproduces the stress state of the actual ground on the model ground in the earthen tank by the centrifugal force, when the hopper is repeatedly moved back and forth while feeding the soil from the groove of the feeder into the earthen tank, A method for constructing an earth structure, characterized in that the moving position is shifted to a position in a rotation direction of a beam from a predetermined deposition position in an earth tank.