JPS5933739B2 - Hollow tube for creating rotating sand piles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a rotary sand pile construction hollow body equipped with an in-pipe sand surface detection device, which is used in construction work to improve soft ground by constructing a large number of sand piles in soft ground. It is related to pipes.

Conventionally, there is a technique in which a hollow tube provided with spiral wings on the outer periphery is used and penetrated into the ground while being rotated, and then a gravel pile is created by drawing it while rotating the hollow tube.

However, the hollow tube used in this construction method is not equipped with a sand surface detection device.

Therefore, according to such conventional technology, although it is possible to know the total amount of gravel used after constructing one gravel pile, there is no way to know the condition of gravel discharge during pile construction other than relying on the intuition of the operator. Ta.

When sand piles are constructed on soft ground using such conventional technology,
Sand piles become narrow or break in the middle, resulting in fatal flaws in the effectiveness of improving soft ground.

Therefore, it is important to keep an eye on the status of sand discharge every moment during sand pile construction.
In other words, it is necessary to know the construction status of sand piles.

The present invention provides a hollow pipe for constructing rotary sand piles equipped with a sand surface detection device in order to achieve such an objective.
The details will be explained below with reference to the attached illustrative drawings.

In Fig. 1, reference numeral 1 denotes a hollow tube, with spiral propulsion blades 2 provided on the outer periphery of the lower part, and a hopper 3 for supplying sand at the upper part.
The upper end of the hollow tube 1 is connected to the hollow drive shaft 5 of the drive machine 4 to obtain rotational force, and the drive machine 40
Rotation transmission path & ζ electric motor 6 → reducer 1 → gear 8,
9→Hollow drive shaft 5.

10 is sand supplied into the hollow tube 1, 10' is the sand surface, and 11 is a weight for detecting the sand surface, which is suspended by a wire rope 12.

The wire rope 12 is wound around a winding drum 15 through a hole 14 provided in a house 13 of the driving machine 4 inside the hollow drive shaft 5.

Further, this 150 rotations of the winding drum is obtained by driving a torque motor 17 having a voltage control mechanism via a reduction gear 16.

Next, sand surface detection using the above device will be explained.

First, just before sand is supplied into the hollow tube 1, a signal is given to apply a large voltage to the voltage control mechanism of the torque motor 17, causing the motor 17 to generate a large torque in the hoisting direction, and the weight 11 is moved into the hollow tube. The weight is prevented from being buried by the sand that is rolled up to the upper part of the pipe 1 and supplied into the pipe.

Immediately after the sand is supplied, a signal is given again to apply a relatively small voltage using the voltage control mechanism, and the weight of the weight 11 generates torque in the torque motor 17.
Make it slightly smaller than the torque applied to 7.

Therefore, the weight 11 falls and is placed on the sand surface 10'l, and the wire rope 12 is tensioned by the torque of the torque motor 11, so that the wire rope 12 does not relax.

Next, when the sand surface 10' position is lowered by sand pile construction,
The weight 11 follows the sand surface 10'.

Since the hollow tube 1 used in the present invention is rotated by the driving machine 4, the sand inside the hollow tube 1 during sand pile construction is
0 rotates integrally with the hollow tube 1.

Accordingly, the weight 11 placed on the rotating sand surface 10' also rotates, causing the wire rope 12 to become twisted and hinder winding on the winding drum 15.

The present invention has a rotational force elimination mechanism A to eliminate such inconveniences.

Figure 2 shows each embodiment of this rotational force elimination mechanism.
Fig. 2 1 shows a wire rope 12 in which a rotational force elimination mechanism A is provided midway near the lower part of the wire rope 12, and 18 is an upper rope 12.
A box-shaped member 19 is fitted into the member 18 and is connected to the lower rope 12, and 20 is a rotating member connected to both members 18.
．． The rotation of the weight 11 is transmitted from the lower rope to the rotating member 19 by the thrust bearing interposed between the two, but the rotation is not transmitted to the box-shaped member 18.

In addition, Fig. 2 (■) shows a system in which a rotational force elimination mechanism A is added between the lower end of the wire rope 12 and the upper end of the weight 11.
is one in which a rotational force elimination mechanism A is provided on the top of the weight 11,
Since both are the same mechanism as in FIG. 2, the same reference numerals are given and the explanation will be omitted.

By providing the rotational force eliminating mechanism A on each side of the present invention, the wire rope 12 wound on the winding drum 15 does not twist due to rotation.

The means for recording the change in the sand surface 10' in the hollow tube 1, properly detected by the sand surface detection device described above, on a recording paper or displaying it on a display will now be briefly described.

That is, the amount of vertical change of the sand surface in the hollow tube → the amount of vertical change of the wire rope → the amount of rotational change of the pulley related to the wire rope → the amount of rotational change of the transmission synchronizing motor associated with the pulley → synchronization with the motor It is possible to use a device and a path such as the amount of change in the rotation of the receiving synchronized motor → the voltage change of the potentiometer.

Then, you can use the voltage change of the potentiometer to move the pen on the recording paper to draw a picture on the recording paper.
It may also be used as a display.

The embodiment shown in FIG. 3 is slightly different from that shown in FIG.

That is, the structure is such that the hollow tube 1 receives direct rotational driving force from the gear 9, and the sand supply hopper 3 is provided so as not to rotate, and the hopper 3 and the hollow tube 1 are connected by a thrust bearing 24. has been done.

Also in this example, the sand surface detection device is the same as in FIGS. 1 and 2.

Further, although not shown, other embodiments of the sand surface detection device will be summarized and described.

That is, in FIG. 1 or 3, an electrode weight is used as the weight 11 and a cable wire is used as the wire rope 12, and the electrode weight, cable wire, control device, and conductive wall of the hollow tube are used. - An electric circuit is formed between the moisture-containing sand inside the hollow tube and the electrode weight so that the contact/non-contact between the electrode weight and the sand surface performs a switching action, and this switching action causes the winding drum to The sand surface is detected by controlling the drive motor so that the electrode weight always follows the sand surface, which changes up and down.

As a supplement here, unless the sand inside the hollow tube is specially dried, it has some moisture in its natural state regardless of the type, so it goes without saying that it has conductivity.

Further, the drive motor for the winding drum is not the torque motor shown in FIGS. 1 or 3, but is a motor, such as a hydraulic motor, which rotates in forward and reverse directions according to signals from a control device.

Furthermore, since the contact of the electrode weight with the sand surface is instantaneous, there is generally no need for a rotational force elimination mechanism as shown in FIG. 2.

A depth meter is a suitable device to be included in conjunction with the sand surface detection device described above, and this depth meter will be described below.

In FIG. 4, the slider 25 of the potentiometer 23 is moved by an endless wire 22, a part of which is connected to one end of the house 13 of the driving machine 4, and the amount by which one hollow tube is lowered is detected as a voltage change. Changes can be recorded using pen movements on recording paper or displayed on a display.

In this way, both the sand surface detection device and the depth meter are connected, and while sand piles are being built underground by means of the rotary sand pile making hollow tube, the discharge per unit length of the built sand piles at various depths is measured. It is possible to detect the amount of sand.

The present invention utilizes a weight at the lower end of a wire rope suspended from a winding drum provided at the upper non-rotating part of a rotary sand pile construction hollow pipe rotated by a drive machine as described above. By following the sand surface in the hollow pipe, it is possible to know the sand discharge status during sand pile construction. The stake is what you get.

In addition, according to the present invention, sand piles can be constructed without vibration or noise, so there is no pollution, construction can be carried out in close proximity to private houses, and each device has vibration resistance. There is no need to take this into account, and the life of the device is also long.

Furthermore, in the present invention, in addition to the above-mentioned sand, construction may be performed using water-added sand, which is obtained by adding an appropriate amount of water to sand, or crushed stone, gravel, slag, water slag, or other sand-like materials may be used instead of sand. Needless to say, it is applicable to construction using granular materials.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view showing an embodiment of the hollow tube of the present invention, and FIG.
The figures are sectional views showing each side of the rotational force elimination mechanism, FIG. 3 is a vertical sectional front view showing another example of the hollow tube of the present invention, and FIG. 4 is an illustrative view of a depth meter. DESCRIPTION OF SYMBOLS 1...Hollow tube, 2...Propulsion L 3-...Sand supply hopper, 10...Sand, 10'...Sand surface, 11...
Weight, 12...Wire rope, A...Rotational force elimination mechanism.

Claims (1)

[Scope of Claims] 1. A non-rotating part is provided above a hollow pipe for sand pile construction rotated by a driving machine, and a winding drum fixed at an appropriate position in this non-rotating part is suspended into the hollow pipe. A hollow pipe for constructing a rotating sand pile, characterized in that a weight for detecting the sand surface inside the pipe is attached to the lower end of a lowered wire rope. 2. The hollow pipe for constructing a rotary sand pile according to claim 1, wherein a rotational force eliminating mechanism is provided at the lower part of the wire rope, the weight, or between the lower end of the wire rope and the weight.