JPH01102120A - Formation of sand pile - Google Patents

Abstract

PURPOSE:To easily form a sand pile with uniform amount of sand by a method in which the moving distance of sand surface in a hollow tube for forming sand pile and the length of pulling are calculated and the pulling speed of the hollow tube is automatically controlled. CONSTITUTION:The output of a sand surface meter to represent the surface position of sand charged into a hollow tube 3 for forming sand pile and output Vg of a depth meter to represent the depth of the tube 3 under the ground are put into analog memory circuits M1 and M2. The moving distance of sand surface and pulling distance are calculated by a differential circuit, and the pulling speed of the tube 3 is calculated from a designed ratio between the moving distance and the pulling length. The winding speed of the wire rope 7 of a winch 4 for vertically moving the tube 3 is controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field The present invention relates to a method for constructing sand piles as designed in soft ground.

(b) Conventional technology When constructing sand piles, a depth gauge that indicates the underground depth of the lower end of a hollow pipe for sand pile construction and a sand level gauge that indicates the position of the sand surface of the sand poured into the hollow pipe have traditionally been used. The amount of sand per unit length of the sand pile is controlled by detecting and recording both of them against the time axis.

However, with this method, workers have to manage the amount of sand used per unit length of the sand pile while comparing the inclination angle of the graph on the recording paper measured by the depth meter and sand level meter. It required a great deal of skill to judge when to pull out the pipe, how long to pull it out, etc., and the operation was also difficult, often resulting in defective parts in the sand piles created.

As a countermeasure to this problem, the present applicant proposed development.

This device is published in Japanese Patent Publication No. 62-13444 ``Sand Pile Construction Control Device,'' and with this device, it is possible to easily pull out a hollow pipe just by looking at a single instrument.

That is, in this device, the ratio between the length of the hollow tube drawn out and the sand surface moving distance that satisfies the design quantity is stored in advance in the calculation section, and the output signals from the depth meter and the sand surface meter are input to the calculation section. The length of the hollow pipe being pulled out is displayed on the operating indicator, and if the operator pulls out the hollow pipe while looking at this indicator, the entire length of the sand pile will be covered. It is possible to create sand piles with a uniform amount of sand that satisfies the design amount, and it is easier to operate than conventional methods, and there are fewer operational errors, so it is very useful for improving the quality of sand piles.

However, when the above operation is performed by an operator, the winch 4 is manually controlled after determining the speed at which the hollow tube should be pulled out by observing the movement of the pointer on the indicator, and the amount to be controlled is also controlled by the operator. The guidelines are based on the judgment of the staff member (
It may swing significantly in the +) or (-) direction.

Therefore, even when pulling out a hollow tube while looking at this operation indicator, skill is still required.
-) Even though it was about to move, the hollow tube was pulled out, and in order to repair it, the hollow tube pulling operation was stopped and the operation indicator was moved in the opposite direction until it pointed to zero (0). Extra work was required, such as having to drive the hollow tube back into the ground, which sometimes resulted in significant lost time.

Moreover, in this case, even in terms of the quality of the sand pile, the middle part of the sand pile becomes extremely thick, making it impossible to obtain a uniform sand pile.

(c) Disclosure of the Invention The present invention uses the sand pile construction management device disclosed in the above-mentioned Japanese Patent Publication No. 13444/1983 to eliminate operator errors, thereby reducing loss time and quality of sand piles. The present invention provides a further improved technique to prevent a decrease in

That is, in the method of the present invention, the input signal to the above-mentioned operation indicator is further input to the control panel of the winch for lifting and lowering the hollow tube, and the signal is generated depending on the degree of excess or deficiency in the length of the hollow tube to be pulled out. This controls the drawing speed.

(d) Embodiment The figure is an explanatory block diagram showing one embodiment of the method of the present invention, which will be explained below.

The sand surface input voltage Vs and the depth input voltage Vg are converted to AsXβl, AgX, and β by the input amplifier circuits Asl and Ag+, respectively.
2 and stored in analog memory circuits Ml and M2.

Therefore, when the sand surface input voltage changes to Vs-+V's and the depth input voltage changes to Vg+V'H, on the sand surface input circuit side, the differential circuit As2 outputs β, V's-β, Vs
The output of =βlΔvS is input to the ratio setting circuit As3,
The output is β1ΔVsX ratio (−α).

On the other hand, on the depth input circuit side, β2v is generated by the differential circuit Ag9.
' g - β2 V g = β2ΔVg is the output.

Then, the outputs of the differential circuits AS2 and Ag9 on the sand surface input ml road side and depth input circuit side are input to the differential circuit Asg, and a) β, ΔVsX (-(E) If >β267g, the outputs are Since more sand than necessary is being discharged outside the tube 3, the pointer 2 of the operation indicator 1 swings to the plus (+) side, indicating that the length of the hollow tube 3 to be pulled out is short. The output signal from the differential circuit Asg is also directly input to the winch control panel 5 to increase the winding speed of the wire lobe 7 by the winch 4 for lifting and lowering the hollow tube, thereby increasing the speed at which the hollow tube 3 is pulled out.

b) In the case of β1ΔVsX(-α) and β2ΔVg, the amount of sand discharged from the hollow tube 3 is too small, so the pointer 2 swings to the minus (-) side and the length of the hollow tube 3 to be pulled out is too large. At the same time, the output signal from the differential circuit Asg is input to the winch control panel 5 to slow down the speed at which the winch 4 pulls out the hollow tube 3.

C) If β1ΔVsX(-α)=β2ΔVg, pointer 2
indicates zero (0), indicating that the current hollow tube drawing operation is appropriate and the sand in the hollow tube 3 is being smoothly discharged.

Therefore, the input signal from the differential circuit Asg to the winch control panel 5 instructs the winch 4 to maintain the winding speed as it is.

In this way, in the method of the present invention, the output signal from the differential circuit Asg is also input to the winch control IB5 to control the drawing speed of the hollow tube 3 without depending on the operator's judgment as described above. 2 will always indicate approximately zero (0).

That is, the relationship between the moving distance of the sand surface and the pulling length, which changes from moment to moment, is directly input to the winch control panel 5, so that the drawing speed of the hollow tube 3 can be controlled without any time lag, and the pointer 2
For example, the value does not swing significantly toward the plus (+) side or the minus (-) side, and the state C) above is always maintained, so pointer 2 indicates near zero (0), and the sand that satisfies the design amount This creates sand piles with a uniform amount.

(E) Effects of the Invention As mentioned above, according to the method of the present invention, the drawing speed of the hollow tube is automatically controlled without depending on the judgment of the operator, so there is no time lag or loss time, and it is possible to sand the hollow tube extremely efficiently. This method has the advantage of creating sand piles with a uniform amount.

[Brief explanation of the drawing]

The figure is an explanatory block diagram illustrating one embodiment of the method of the present invention. Code explanation

Claims (1)

[Claims] The ratio between the length of a hollow pipe for sand pile construction that satisfies the design amount and the moving distance of the sand surface in the hollow pipe is stored in advance in the calculation section, and the output signals from the depth meter and the sand level meter are sent to the calculation section. In a method of constructing sand piles using a construction management device that inputs information and displays the excess or deficiency of the length of the hollow pipe to be pulled out during sand pile construction using an operation indicator, A sand pile construction method characterized by separately inputting an input signal to a winch control panel for lifting and lowering hollow tubes, and controlling the pulling speed according to the degree of excess or deficiency in the length of hollow tubes to be pulled out.