JPH0344637B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention is a vacuum suction earth removal type used when underground pipes are propelled and laid across the lower part of roads, railway tracks, structures, etc. This invention relates to a sand and water separation device in a buried pipe propulsion device.

[Prior art]

As a buried pipe underground propulsion method, a cutter opening with an excavation and removal chamber that is open toward the front is fitted at the front end of a buried pipe that is propelled underground, and air is supplied to the excavation and removal chamber. A suction pipe and a vacuum suction source are connected to the upper part of a receiver installed on the ground, and a suction pipe and a vacuum suction source are connected to the rear lower part of the excavation and earth removal chamber, which accommodates a cutter with a feeding blade that is provided with a mouth and is rotated by a drive device, and
Furthermore, a rotary valve for earth removal is connected to the lower part of the receiver, and while the buried pipe and cutting edge are propelled, the earth and sand excavated by a cutter with a feed blade is removed.
A method has been proposed in which the earth and sand in the receiver is sucked into a receiver through a suction pipe using vacuum suction power, and the earth and sand in the receiver is discharged onto a loading conveyor through a rotary valve (Japanese Patent Application No. 59-246283 Showa 61-126297
(Refer to the Publication No.).

However, when pushing a buried pipe underground as described above, if the ground is spring ground or encounters spring water ground or stagnant ground during propulsion, earth and water will pass through the suction pipe and reach the receiver. Since the excavated soil is sucked in by the rotary valve and discharged as mud from the rotary valve, it cannot be directly loaded onto a truck or the like and transported, making it difficult to dispose of the excavated soil.

[Objective and Structure of the Invention] The object of the present invention is to provide a soil and water separation device in a vacuum suction earth removal type buried pipe propulsion device that can advantageously solve the above-mentioned problems. A cutting hole 3 having an excavation and removal chamber 2 that is open toward the front is fitted into the front end of a buried pipe 1 that is propelled underground, and the excavation and removal chamber 2 is filled with compressed air. A supply air inlet 4 is provided, and a cutter drive device 5 is installed in the excavation and unloading chamber 2.
In the vacuum suction soil removal type underground pipe propulsion device, a vacuum suction soil removal type buried pipe propulsion device is provided with a cutter 6 with a feed blade rotated by a The suction pipe 7 and vacuum suction source 9 are connected to the upper part of the vacuum receiving tank 8 installed in A chamber 11 and a discharge chute 12 with a valve are successively connected, and a screw conveyor 13 rotated by a drive device is arranged so as to extend across the lower part of the vacuum receiving tank 8 and the inside of the strainer 10, The suction pipe 7 and the vacuum suction source 9 are connected to the upper part of the water storage tank 14 in the earth and sand water separation device in the vacuum suction earth removal type buried pipe propulsion device.

〔Example〕

Next, the present invention will be explained in detail using illustrated examples.

The drawings show embodiments of the invention,
A propulsion device pedestal 17 having a reaction wall 16 is installed in the starting shaft 15, and the propulsion device pedestal 17
The propulsion device 1 is equipped with a propulsion jack 18.
A buried pipe 1 such as a humid pipe, a vinyl chloride pipe, a steel pipe, etc., on which a pipe 9 is placed and propelled into the ground by a propulsion jack 18 of a propulsion device 19, is connected to a connecting collar 20.
The front end of the buried pipe 1 at the forefront is fitted with a steel blade 3 having an excavation and removal chamber 2 that is open toward the front. 2 is composed of a truncated conical front chamber that expands toward the front and a cylindrical rear chamber connected to the rear thereof.

The rear part of the cutter shaft 21 of the bladed cutter 6 is fitted into the center of the rear part of the cutting edge 3 via a bearing 22 so as to be rotatable and not move in the axial direction. 6 is fixed to the middle part of the cutter shaft 21 and a cutter arm 23 fixed radially to the front end of the cutter shaft 21 and a retaining plate 25 having an earth removal opening 24 fixed between each cutter arm 23. Spiral feed blade 26
It is composed of.

A cutter drive device 5 consisting of a hydraulic motor is fixed to the central rear part of the cutting edge 3, and the rotating shaft of the cutter drive device 5 is connected to the cutter shaft 21, and the hydraulic motor is connected to a liquid supply hose 27 and a liquid drainage hose. hose 2
8 to a ground pressure fluid supply unit (not shown).

A plurality of air supply pipes 29 each having a compressed air supply air supply port 4 that opens into the truncated conical front chamber of the excavation and soil removal chamber 2 are provided around the blade opening 3. is connected to one end of an air supply branch pipe 30 that communicates with the air supply pipe 29, and the branch pipe 30
The other end of the air supply hose 32 is connected to an air supply header 31, and the other end of the air supply hose 32, which has one end connected to the air supply header 31, is connected to a compressed air supply source consisting of a compressor 33 installed on the ground. pressure regulating valve 3
4, and an air pressure detector 35 is attached to the upper part of the excavation and removal chamber 2 to detect the air pressure inside the excavation and removal chamber. The pressure regulating valve 34 is automatically controlled by the air pressure detector 35 via the control device so that the pressure is set at a suitable value equal to or higher than the earth pressure of the ground in front of the air pressure sensor 2.

The air pressure setting value in the excavation and soil removal chamber 2 is as follows:
Determined in advance considering soil quality.

A suction hole 36 that opens to the rear lower part of the excavation and soil removal chamber 2 is provided at the lower part of the blade mouth 3, and the front end of a suction pipe 7 that communicates with the suction hole 36 is connected to the rear part of the blade mouth 3. The rear end of the suction pipe 7 is led to the ground, and on the ground there is a vacuum suction source 9 consisting of a vacuum receiving tank 8 and a vacuum pump driven by an electric motor 37.
A water storage tank 14 and a water receiving tank 38 are provided, and the end of the suction pipe 7 and the vacuum suction pipe 39 of the vacuum suction source 9 are connected to the upper part of the vacuum receiving tank 8. An electromagnetic on-off valve 40 is provided, and an air intake port 41 is provided at the top of the vacuum receiving tank 8 for taking in air during dehydration. A filter 43 is attached to the upper part of the receiving tank 8 at a position facing the end of the vacuum suction pipe 39 and the air intake port 41 .

A cylindrical drainage chamber 1 having a circular opening provided at the lower front part of the vacuum receiving tank 8 and having a cylindrical strainer 10 made of fine wire mesh inside.
A chute 45 is connected to the lower part of a cylindrical body 44 with a front end plate which is connected to the front end of the drainage chamber 11 and which is connected to the rear end of the drain chamber 11 . A rotary valve 47 consisting of a rotor 62 with radial vanes and a casing 63 having an upper inlet and a lower outlet is provided, and the valved earth removal chute 12 is constituted by the chute 45 having the valve 47 and the cylindrical body 44. There is.

One end of a branch suction pipe 48 is connected to the vacuum suction pipe 39 between the vacuum suction source 9 and the electromagnetic on-off valve 40, and the other end of the branch suction pipe 48 is opened from the side at the upper part of the water storage tank 14. The branch suction pipe 48 is provided with an electromagnetic on-off valve 49, one end of a drain pipe 50 is connected to the lower part of the drain chamber 11, and the other end of the drain pipe 50 is connected to It is connected to the upper end of the water storage tank 14 so as to open downward, and an electromagnetic on-off valve 51 and a drainage conduit 52 are connected to a drain port at the lower end of the water storage tank 14.

A screw conveyor 13 rotated by a drive device 53 consisting of an electric motor is arranged so as to extend across the lower part of the vacuum receiving tank 8 and the inside of the strainer 10, and the screw conveyor 13 is connected to a rotating shaft 54. It is composed of a fixed metal spiral blade 55 and a rubber spiral scraper plate 58 that is in contact with the outer circumferential side of the spiral blade 55 and fixed with a presser plate 56 and bolts 57.

The air discharge pipe 59 of the vacuum suction source 9 is connected to the middle part of the water tank 38 in the height direction, and the air discharge pipe 60 is connected to the upper end of the water tank 38. An on-off valve 61 is attached to the.

When the underground pipe 1 is propelled underground using the device of the above embodiment, the electromagnetic on-off valves 42 and 49 are closed, the electromagnetic on-off valve 40 is opened, and the cutter drive device 5 and the vacuum suction source 9 are closed. , compressor 33, etc. are operated, and the earth and sand that has been excavated by the cutter 6 with feed blades and has entered the excavation and unloading chamber 2 is conveyed into the vacuum receiving tank 8 through the suction pipe 7 by the vacuum suction force.

Next, when the screw conveyor 13 and the valve 47 consisting of a rotary valve are rotated, the earth and sand in the vacuum receiving tank 8 is transferred to the screw conveyor 13.
The strainer 10 and the cylinder 4 are transferred forward by the
4, is supplied to a loading conveyor or the like through a chute 45 and a valve 47.

When propelling through spring ground or stagnant ground, or if spring water or stagnant ground is encountered during propulsion, earth and water will enter the excavation and removal chamber 2, and the earth and water will be absorbed by the vacuum suction force. is transported into the vacuum receiving tank 8 through the suction pipe 7,
After passing through the strainer 10, the water in the vacuum receiving tank 8 is sucked through the drain chamber 11 and the drain pipe 50 and stored in the water storage tank 14. In this case, the electromagnetic on-off valve 49 may be opened.

When performing the work of adding the buried pipe 1, the operations of the screw conveyor 13, vacuum suction source 9, and valve 47 are stopped.

As described above, the soil may be removed from the vacuum receiving tank 8 while the excavation is being carried out, or the excavation may be carried out with the screw conveyor 13 and the valve 47 stopped to remove the excavated soil. Sediment is stored in the vacuum receiving tank 8, and when the amount of sediment in the vacuum receiving tank 8 exceeds a certain level, the screw conveyor 13 and valve 47 may be operated to discharge the sediment in the vacuum receiving tank 8. . When the earth and sand stored in the vacuum receiving tank 8 contains a large amount of moisture, the vacuum suction source 9 is operated with the electromagnetic on-off valve 40 closed and the electromagnetic on-off valves 42 and 49 opened. Water in the vacuum receiving tank 8 is sucked into the water storage tank 14 through the strainer 10, the drain chamber 11, and the drain pipe 50.

As in the previous embodiment, the screw conveyor 13
If a rubber spiral scraper plate 58 is attached to the outer peripheral side of the spiral blade 55 in , the inner surface of the strainer 10 can be rubbed by the rotation of the scraper plate 58, thereby preventing clogging of the strainer 10.

When carrying out this invention, a knife gate valve having a knife gate driven by a cylinder may be used instead of the rotary valve as the valve 47 provided in the chute 45.

〔Effect of the invention〕

According to this invention, when carrying out vacuum suction earth removal type buried pipe propulsion in spring water ground or stagnant ground, etc., the earth and sand and water that have entered the excavation earth removal chamber 2 are removed.
The water in the vacuum receiving tank 8 is suctioned and conveyed through the suction pipe 7, and the water in the vacuum receiving tank 8 is stored in the water storage tank 14 through the strainer 10 and the drainage chamber 11 by the vacuum suction force, and the earth and sand in the vacuum receiving tank 8 is Since the soil is transferred by the screw conveyor 13 and discharged from the soil discharge chute 12 with a valve, the soil can be discharged as soil from which water has been removed, and the excavated soil can be easily transported and disposed of. Since the earth and sand are forced to be fed through the strainer by the conveyor 13, effects such as effective dewatering can be obtained when the earth and sand passes through the strainer 10.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which FIG. 1 is a schematic longitudinal side view showing a soil and water separation device in a vacuum suction earth removal type buried pipe propulsion device, and FIG.
The figure is an enlarged longitudinal side view of the sediment water separation device in Fig. 1, Fig. 3 is an enlarged longitudinal sectional front view of the dewatering section, and Fig. 4 is a longitudinal cross-section showing the front part of the vacuum suction earth removal type buried pipe propulsion device. A side view, FIG. 5 is a vertical cross-sectional side view showing an enlarged part of FIG. 4, and FIG. 6 is an A-A in FIG. 5.
7 is a front view of the part shown in FIG. 5 seen from the left side, FIG. 8 is a vertical side view showing the connecting part of the buried pipe, and FIG. 9 is a sectional view taken along line B-B in FIG. 2. It is a diagram. In the figure, 1 is a buried pipe, 2 is an excavation and removal room, and 3
is a blade opening, 4 is an air inlet for supplying compressed air, 5 is a cutter drive device, 6 is a cutter with a feed blade, 7 is a suction pipe, 8 is a vacuum receiving tank, 9 is a vacuum suction source, 10
is a strainer, 11 is a drainage chamber, 12 is a soil discharge chute with a valve, 13 is a screw conveyor, 14
24 is a water storage tank, 24 is an opening for draining soil, 26 is a feed blade, 29 is an air pipe, 33 is a compressor, 34
is a pressure regulating valve, 35 is an air pressure detector, 36 is a suction hole, 39 is a vacuum suction pipe, 40 is an electromagnetic on-off valve, 4
1 is an air intake port, 42 is an electromagnetic on-off valve, 43 is a filter, 45 is a chute, 47 is a valve, 55 is a metal spiral blade, and 58 is a rubber spiral scraper plate.

Claims (1)

[Claims] 1 A cutter opening 3 having an excavation and removal chamber 2 that is open toward the front is fitted into the front end of the buried pipe 1 that is propelled underground, and the excavation and removal chamber 2 is equipped with a compressed air supply pipe. An excavation and removal chamber 2 provided with an air vent 4
Vacuum suction soil removal type burial in which a cutter 6 with a feeding blade is provided which is rotated by a cutter drive device 5, and a suction pipe 7 connected to a vacuum suction source is connected to the rear lower part of the excavation and soil removal chamber 2. In the tube propulsion device, the suction pipe 7 and the vacuum suction source 9 are connected to the upper part of the vacuum receiving tank 8 installed on the ground, and the opening provided in the front part of the lower part of the vacuum receiving tank 8 has an inner Drainage chamber 11 equipped with strainer 10
A screw conveyor 13, in which a screw conveyor 13, which is rotated by a drive device, is arranged so as to extend across the lower part of the vacuum receiving tank 8 and the inside of the strainer 10, and is connected to the soil removal chute 12 with a valve. The earth and sand water separator in the vacuum suction earth removal type buried pipe propulsion device is characterized in that the pipe 7 and the vacuum suction source 9 are connected to the upper part of the water storage tank 14.