JPS6272886A - Earth and sand discharge apparatus - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention relates to an improvement of a submersible pump type reverse circulation drilling device, and includes a method for discharging sediment that is accumulated in an excavation pipe when the submersible pump is stopped. Regarding equipment.

(b) Conventional technology Submersible pump type reverse circulation drilling equipment, which excavates a vertical hole by sequentially connecting a drilling bit, a submersible pump, and a drain pipe, uses the entire pump head only for discharge because the pump is placed underwater. This has the advantage of being efficient and capable of handling deep excavations, but if an unexpected situation such as a power outage occurs, the rotation of the submersible pump will also stop and the soil will descend inside the soil removal pipe. Sediment builds up on the outlet of the submersible pump (this increases as the excavation depth increases), making it impossible to restart the submersible pump. At that time, the submersible pump had to be brought to the surface and repaired. In addition, 1. Even during normal excavation work, the submersible pump is stopped when connecting the soil discharge pipe, but in this case, cleaning the inside of the soil discharge pipe (raising the submersible pump slightly above the excavation point and running it dry) is recommended. ) If the submersible pump is stopped without doing so, there is a problem in that the submersible pump cannot be restarted.

(C) Problems to be Solved by the Invention The present invention has been made in view of the above circumstances, and its purpose is to solve the problem even if an unexpected situation such as a submersible pump stopping during shaft excavation occurs. .

To provide an earth and sand discharge device that prevents excavated earth and sand from clogging an earth discharge pipe.

(d) Ninth Means for Solving the Problems In order to achieve this object, the present invention provides a reverse circulation drill g device that excavates a vertical hole by stubbornly connecting a drilling bit, a submersible pump, and an earth removal pipe. In the earth discharge pipe connected to the submersible pump, there is a valve that is closed by the weight of the balance weight and opened by the upward flow of the submersible pump, and the earth and sand that descends inside the earth discharge pipe when the valve is closed. The receiver for discharging the water to the outside is characterized by a case having a plate inserted therein.

Ce) Effect In the present invention, the earth and sand discharge device having the above-mentioned configuration is provided on the earth discharge pipe connected to the submersible pump, so that when the submersible pump is being driven, the upward flow of the submersible pump is caused by the weight of the balance weight. The valve is opened against this, and the rotation of the valve closes the earth and sand discharge port of the case, so that the earth discharge pipe is brought into communication. Therefore, the earth and sand excavated by the bit are sucked up together with muddy water by the submersible pump.

It is discharged to the ground through a soil discharge pipe, a soil discharge device, and a soil discharge pipe. If the submersible pump stops during excavation, the above-mentioned valve is closed by the weight of the balance weight, and the soil discharge pipe becomes blocked, and the earth and sand that descends inside the upper soil discharge pipe via the plate can be removed from the case. is discharged to the outside from the sediment discharge port. Therefore, excavated soil will not accumulate at the discharge port of the submersible pump.

(f) Example Below 1 An example of the present invention will be explained using FIGS. 1 to 3.
This will be explained more specifically. Figure 1 is an enlarged cross-sectional view of the main parts of the present invention (1111 side view, Figure 2 is taken along A-A in Figure 1).
The arrow view and FIG. 3 are overall side views showing a state in which a vertical hole is excavated by the submersible pump type reverse circulation drilling device according to the present invention. In Figure 3, 1 is an excavated shaft containing muddy water. Reference numeral 2 denotes a drilling bit, and the rotational force to the bit 2 is transmitted by a drive device (not shown) installed on the ground. 3 is a submersible suction pump (hereinafter referred to as submersible pump), which is composed of a two-blade centrifugal pump, and allows solid matter to pass through easily. 4 is a stabilizer for improving vertical accuracy, and is formed in the shape of a roller to guide the inside of the steel pipe.

Reference numeral 5 denotes an earth discharge pipe for discharging excavated earth and sand, which is divided into a lower earth earth discharge pipe 5a and an upper earth earth discharge pipe 5b by interposing the earth and sand discharge apparatus of the present invention. Incidentally, although not shown in the figure, the earth removal pipe 5 is constructed by connecting pieces of a fixed length condyle. 6 is a dummy pipe that balances the submersible pump 3.

By driving the submersible pump 3, the earth and sand excavated by the bit 2 is sucked up together with muddy water, and the earth and sand excavated by the bit 2 are sucked up together with muddy water. Submersible pump 3. Lower soil discharge pipe 5a, soil discharge device 17. Upper earth discharge pipe 5
Next, the structure of the earth and sand discharge device 7 will be explained with reference to FIGS. 1 and 2. Reference numeral 10 denotes a case with flanges at both ends, the lower flange 10a is connected to the lower earth discharge pipe 5a through a mounting bolt, and the upper flange 10b is connected to the upper earth earth discharge pipe 5b through a mounting bolt.

The fitting dimensions and inner diameters of the upper and lower seven flange 10a, 10b are compatible with the connection of the earth removal pipe 5. 10C is case 1
A sand discharge port 10d is provided on the − side of the body of the vehicle. Numeral 8 is a valve that closes the lower earth discharge pipe 5a by closing the inner diameter of the lower 7 flange 10a, and numeral 11 is a valve that is disposed at the lower end of the case 10 on the earth and sand discharge port 10d side and is rotatable through the body portion 10c. In the supported shaft, the shaft portion 14a of the balance weight 14 is optionally attached to one end of the shaft 11, and is fixed at any position, so that the weight balance can be adjusted. Reference numeral 9 denotes a holding plate holding down the valve 8, and its pipe portion 9a is fitted into the shaft 11IC and fixed with a fixing pin 12.

Reference numeral 13 denotes a plate for discharging earth and sand from above to the outside, and its upper surface 13a is inclined and is fixed integrally with the holding plate. However, the valve 8° and the holding plate 9. Uke is board 1
3 and 111111 are integrally constructed and are configured to be rotatable about $11 as a fulcrum.

Next, the operation of the earth and sand discharge device 7 will be explained. When the submersible pump 3 is not driven, the valve 8 is in a state of covering the lower earth discharge pipe 5a, as shown by the solid line in FIG.
This is due to the weight of the balance weight 14.

When the submersible pump 3 is driven, the flow of muddy water discharged by the submersible pump 3 causes the valve 8 to
The balance weight 14 is rotated upwards and upwards with
8(7)m111 Since it is attached with one pin 12, the flow rate of muddy water discharged by the submersible pump 3 is
When the weight falls below a certain value, the weight of the balance weight 14 is greater than the weight of the balance weight 14, and the valve 8 rotates in the direction of closing. When the flow velocity becomes zero, the lower earth discharge pipe 5a is closed. In this state, that is, when the submersible pump 3 stops, the sediment that has been rising inside the upper earth discharge pipe 5b falls inside the pipe, the receiver inside the case 10 hits the plate 13, and the earth and sand exit from the earth and sand discharge port 10d. is discharged.

Since the above-mentioned earth and sand discharge device is installed in the middle of the earth removal pipe 5, there is no possibility that bolts, nuts, spanners, etc. may be accidentally dropped into the earth removal pipe 5 while connecting the earth discharge pipe 5 on the ground. Since the water does not come into direct contact with the submersible pump 3, the submersible pump can also be prevented from malfunctioning.

(g) Effects of the Invention As described above, according to the present invention, the earth and sand discharge device discharges the earth and sand that descends inside the earth discharge pipe connected to the submersible pump to the outside when the submersible pump is stopped. Since the submersible pump is inserted, even if the submersible pump is stopped due to an emergency or trouble such as a power outage, it can be restarted without soil clogging the soil discharge pipe. In addition, in order to stop the submersible pump when connecting the earth removal pipe to extend the excavation depth, conventionally it was necessary to stop the submersible pump after running it dry (cleaning), but this can be omitted. This has the effect of improving labor efficiency.

[Brief explanation of drawings]

Figure wE1 is a cross section IglIF showing an enlarged view of the main parts of the present invention.
Fig. k1 and Fig. 2 are views taken along the line A-A in Fig. 1, and Fig. 3 is an overall audience diagram showing the state of excavating a vertical hole by the submersible pump type reverse circulation drilling device according to the present invention.

Claims (1)

[Claims] In a reverse circulation drilling device that excavates a vertical hole by sequentially connecting a drilling bit, a submersible pump, and an earth removal pipe, the earth excavation pipe connected to the submersible pump is closed by the weight of a balance weight, and an underwater A sediment discharge device characterized in that a case is inserted, which has a valve that is opened by the upward flow of a pump, and a receiving plate that discharges sediment that descends inside the soil discharge pipe to the outside when the valve is closed.