JPS6115206B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for measuring the height of the sand surface inside a hollow tube used in a method of constructing sand piles in soft ground by rotating a hollow tube with propulsion vanes, pulling it out, etc. It is.

Conventionally, in the sand pile construction method in which a hollow tube with propulsion blades is rotated to perform penetration and extraction, the height of the sand surface inside the tube has not been measured. In addition, a sand level measuring device is used in the method of building sand piles by installing a vibrator or the like on the top of a hollow tube and penetrating it into the ground and pulling it out, but this is a hollow tube that does not rotate. Therefore, it cannot be applied to the method of constructing sand piles by rotating hollow tubes with propulsion vanes.

This invention solves the above problems, and details thereof will be explained below based on the drawings.

In FIG. 1, A is a rotary drive machine that moves up and down along a guide rail 27, including a house 5, an electric motor 6,
Driving gear 7, driven gear 8, rotation transmission/fluid passage 1
0, a fluid inlet 19, and a rotation joint 20, this is a general known mechanism for single-axis rotation. This rotary drive machine A has a sand feeding hopper B and a propulsion blade 13.
The entire penetrating attachment is made up of the hollow tubes C connected to each other.
It is transmitted to sand input hopper B and hollow tube C. The compressed air inside the hollow tube C for promoting sand discharge is sent through the gas supply valve 31 leading to the fluid inlet 19, into the fluid passage 10, through the connecting pipe 28, the switching valve 32, and the hollow tube inlet 29 in this order. The air flows into the hollow tube C, and the airtightness within the hollow tube C is maintained by the airtight valve 18 and the valve seat 17. In addition, when water injection is performed, valves 31 and 32 are closed and water supply valve 3 is closed.
3. Open the switching valve 34 to supply pressurized water to the fluid inlet 19;
The liquid flows through the passage 10, the pipe 28, the valve 34, and the conduit 35, and is injected from the nozzle at the lower end of the hollow tube C.

This invention penetrates such a power transmission coupling,
The purpose of the sand level setting device of the present invention is to measure the height of the sand level inside the hollow tube while maintaining airtightness inside the hollow tube. The sand surface height measuring device D includes a winding device 1, a wire guiding sheave 2, a wire 3, and a weight 4.
Consisted of.

Next, the relationship between the sand level measuring device D and the above-mentioned rotary drive machine A, sand charging hopper B, and hollow tube C will be explained.

The wire 3 for setting the sand surface passes through all the rotation centers of the hollow tube etc. and reaches the sand surface 16 inside the hollow tube C.
That is, the wire 3 from the winding device 1 installed at an appropriate location in the house 5 is guided to the rotation center by the guide sheave 2, passes through the guide pipe 22 and the rotation joint 23, and is then fixed to the airtight valve seat 17. The wire passes through the airtight hole 24 at the upper end of the protective pipe 25 and reaches the sand surface 16. In the illustrated example, the upper end of the pipe 22 is fixed to the fluid inlet 19 at the upper end of the house 5 in order to prevent the pipe 22 from rotating and to prevent the wire 3 from twisting.
0 through a rotation joint 20, so that even if the fluid passage 10 rotates, the fluid inlet 19 does not rotate, and therefore the pipe 22 also does not rotate. The guide pipe 22 is cut at the rotating joint 23,
The lower end 22' of the guide pipe below is fixed to the fluid passage 10 and rotates at the same time as the fluid passage 10, but this lower end 22' is made extremely short to minimize the influence on the wire 3. It can be done. Although not shown, the guide pipe 22 is extended downward from the lower end of the rotating fluid passage 10, and the gap between the lower end of the fluid passage 10 and the guide pipe 22 is sealed with an appropriate sealing material. In this way, the wire 3 can take a path with no rotation at all. However, if the pipe 22 is made thicker so that it does not rotate together with the wire 3, the lower end of the pipe 22 is fixed to the lower end of the passage 10, and the upper end of the pipe 22 is rotatably attached to the upper end of the passage 10 and the upper end of the house 5. Install. The protection pipe 25 has a relatively large inner diameter, and therefore the protection pipe 25 has a relatively large inner diameter.
5 rotates with the hollow tube C, but the wire 3 can be prevented from co-rotating. In this case, pipe 2
It is preferable to attach a perforated member having an airtight hole 24' slightly larger than the diameter of the wire 3 to the upper end of the wire 5. The airtight valve 18 and the valve seat 17 may be as shown in FIG. 3, for example. That is,
The airtight valve 18 has a notch into which the pipe 25 fits, and rotates downward around the shaft 24.
The valve seat 17 is provided with a protruding portion to supplement the notch portion of the airtight valve 18, and the protective pipe 25 is fixed thereto. Therefore, the compressed air that has reached the fluid inlet 29 to the hollow tube C from the fluid outlet 28 via the pipe is blown out to the airtight valve 18.
The airtight valve 18 will be closed.

Next, the sand surface height measuring device D will be explained.

Example 1: A weight 4 is used as an electrode weight at the detection end of the changing sand surface level in the hollow tube C. The weight 4 is suspended by a wire 3 covered with an insulator, and the covered wire 3 is connected to the induction sheave 2. In addition to winding and unwinding by the winding device 1, an electrode weight, a coated wire, a control device, an electrically conductive inner wall of the hollow tube, sand containing water inside the hollow tube, and an electrode weight are introduced. By forming an electric circuit, the contact/non-contact of the electrode weight with the sand surface performs a switching action, and this switching action controls the drive of the winding device so that the electrode weight is constantly connected to the fluctuating sand surface. The amount of movement of the wire was converted into the amount of rotation of the winding device, and this was further configured to obtain an output voltage proportional to the amount of sand in the hollow tube from a potentiometer associated with the winding device. It can be used as a sand surface height measuring device. In addition, by providing a depth gauge configured to continuously detect the underground depth at the tip of the hollow pipe, the unit length of the sand pile to be constructed at each intermediate depth of the hollow pipe can be adjusted. The amount of sand discharged per hit can be detected.

Example 2 - In this case, the winding device is set to wind at two different torque levels, high torque and low torque, and the relationship of high torque > torque generated by the weight of the weight > low torque is satisfied. Set it so that Therefore, when sand is introduced into the hollow tube from the sand input hopper, a high torque is generated in the winding device to wind up the weight (at this time, the weight is wound up into the protective pipe 25 in FIG. 1). Next, once the sand has been added, a low torque is generated in the winding device.
Then, since the torque generated by the weight of the weight is larger than the above-mentioned low torque, the weight descends while applying a constant tension to the wire. The weight then stops when it reaches the sand surface inside the hollow tube, and thereafter, each time the sand surface position lowers, the weight follows and descends, making it possible to sequentially detect the sand surface inside the hollow tube. From this point on, converting the amount of movement of the wire into the amount of rotation of the winding device, relating it to the underground depth of the hollow tube, etc. is the same as in Example 1.

The device of the present invention has been explained in detail above, but
Next, FIG. 2 shows a modified example of the device. Second
Only the parts of the apparatus shown in the figure that are different from those in FIG. 1 will be described.

The rotary drive machine A' of the apparatus shown in FIG. 2 is a general type that is configured to rotate two shafts. Therefore, what is intended in the present invention is to transfer the rotational driving force from the plurality of drive gears 7 to the plurality of driven gears 8,
9 to select and transmit. In this case, the driven gear 8a meshes with the driven gear 8. In the case shown in Figure 2, house 5
A driven gear 9 on the outer periphery of the upper end of the hollow tube C′ fitted in the opening 11 of the hollow tube C′ transfers the driving force from the electric motor 6 to the hollow tube
It is transmitted to C′. In this case, it is for low speed rotation and high torque. In this case, the rotation transmission/fluid passage 10 is connected to the lower hollow tube due to the presence of the driven gear 8a.
Although the rotation is opposite to C', there is no problem due to the upper and lower rotation joints 20 and 21. In addition, when rotating the hollow tube C′ at high speed with low torque, the second
The hollow tube C' shown in the figure is removed, the upper end of another hollow tube (not shown) is fixed to the rotation transmission/fluid passage 10, and the hollow tube is connected to the upper driving gear 7 and the driven gear 8.
a, 8, and the lower drive gear 7 has play. In this case, since the passage 10 rotates together with the hollow tube, the mechanism is almost the same as that shown in FIG.

According to the device according to the present invention as described above, even in the method of constructing sand piles in soft ground by rotating a hollow tube with propulsion vanes, pulling it out, etc., the sand surface height measuring device can be used regardless of the rotation. , it is possible to measure the sand surface inside the pipe. As the hollow tube with propulsion vanes continues to rotate, the inside of the tube can be pressurized with compressed air.

[Brief explanation of the drawing]

1 and 2 are longitudinal sectional side views of each embodiment of the device of the present invention, and FIG. 3 is an exploded perspective view of an airtight valve and a valve seat. 1... Winding device, 2... Wire guiding sheave, 3... Wire, 4... Weight, 5... House, 9... Fluid inlet, 10... Rotation transmission and fluid passage, 19... Fluid inlet , 20, 23... Rotating joint, 22... Guide pipe, 24... Airtight hole, 25... Protective pipe, A... Rotating drive machine, B
...Sand charging hopper, C...Hollow tube, D...Measuring equipment.

Claims (1)

[Claims] 1. In a sand pile construction device that creates sand piles in soft ground by rotating and pulling out hollow pipes for sand pile construction, a cylindrical rotation transmission/fluid passage driven by a rotary drive machine and a hollow pipe are used. A fluid inlet fixed to the house of the rotary drive machine is connected to the upper end of the rotation transmission/fluid passage via a rotation joint, and a guide installed in the rotation transmission/fluid passage. The lower end of the pipe protrudes into the hollow pipe from the lower end of the rotation transmission/fluid passage, a protective pipe is provided concentrically with the hollow pipe in the airtight valve section below the guide pipe, and a winding device is installed in a house, etc. A wire is hung concentrically with the hollow tube using a wire guide sheep, and is loosely fitted into the guide pipe and passed through the protective pipe.A weight for detecting the sand surface is attached to the lower end of the wire. Height measuring device.