JPH0369440B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to underground propulsion of underground pipes, which is used when propulsion-laying underground pipes across the lower part of roads, railway tracks, structures, etc. It is related to construction methods.

[Prior art]

Conventionally, as one of the underground pipe propulsion methods, a leading pipe with a blade at the front end is connected to the front end of the buried pipe propelled by jacks, and a pipe is provided inside the leading pipe that is inclined so as to spread forward and upward. A pair of left and right lateral guide plates are used to guide the earth and sand that enters the leading pipe to the rear of the weir plate at the rear of the lower end of the front lateral guide plate, and to the front upward slope provided at the top of the leading pipe. Water is supplied from the water pipe onto the slanted upper guide plate, and this water flows down from the edge of the upper guide plate in a film form to be supplied to the earth and sand behind the weir plate. A method is known in which soil and soil are mixed with a rotating stirring blade, sucked in with a vacuum suction pipe, and discharged to the outside (see Japanese Patent Publication No. 12365/1983).

However, in the case of the conventional buried pipe underground propulsion method, a large amount of muddy water, which is a mixture of earth and sand, is discharged to the outside, so a large muddy water treatment facility is required, and a large amount of muddy water is discharged from the muddy water treatment facility. Problems arise, such as where to release the water.

[Purpose and structure of the invention]

The purpose of this invention is to provide a method for underground propulsion of a buried pipe that can advantageously solve the above-mentioned problems. A blade opening 3 having an excavation and unloading chamber 2 opened toward the front is fitted in the section, and compressed air is supplied from a compressed air supply source into the excavation and unloading chamber 2. While maintaining the air pressure in the excavation and removal chamber 2 at a level equal to or higher than the earth pressure at the front of the excavation and removal chamber 2, earth and sand are excavated and transferred to the rear using a cutter 4 with a feed blade that rotates at the front of the excavation and removal chamber 2. , the earth and sand in the excavation and earth removal chamber 2 is suction-transferred through the suction pipe 5 along with air by the vacuum suction force in the suction pipe 5 connected to the rear lower part of the earth excavation and earth removal chamber 2, and is discharged. It is in the underground pipe underground propulsion method.

〔Example〕

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

The drawings show embodiments of the invention,
A propulsion device pedestal 8 having a reaction wall 7 is installed in the starting shaft 6, and a propulsion device 10 equipped with a propulsion jack 9 is mounted on the propulsion device pedestal 8. Buried pipes 1 such as hume pipes, vinyl chloride pipes, and steel pipes are propelled into the ground by a propulsion jack 9, and are fitted into connecting collars 11 and successively connected. A steel cutting edge 3 having an excavating and discharging chamber 2 that is open toward the front is fitted and connected, and the excavating and discharging chamber 2 is connected to a truncated conical front chamber that expands toward the front and its rear. It consists of a cylindrical rear chamber.

The rear part of the cutter shaft 12 of the bladed cutter 4 is fitted into the center of the rear part of the blade opening 3 via a bearing 13 so as to be rotatable and not move in the axial direction. 4 is a cutter arm 14 fixed radially to the front end of the cutter shaft 12, a retaining plate 16 having an earth removal opening 15 fixed between each cutter arm 14, and the cutter shaft 1.
2 and a spiral feeding blade 17 fixed to the intermediate portion of the blade.

Hydraulic motor 1 for driving the cutter is located at the center rear of the blade mouth 3.
8 is fixed, the rotating shaft of the hydraulic motor 18 is connected to the cutter shaft 12, and the hydraulic motor 18
is connected to a pressure fluid supply unit (not shown) on the ground via a fluid supply hose 19 and a drainage hose 20, and the fluid supply hose 19 and drainage hose 2
0 is composed of a hose unit and a hose unit joint, and furthermore, a suction hole 21 is provided at the lower part of the blade opening 3 and opens at the rear lower part of the excavation and soil removal chamber 2. The front end of a suction pipe 5 communicating with the hole 21 is connected, and the rear end of the suction pipe 5 is connected to a dirt suction port provided at the top of a receiver 22 installed on the ground.

Buried pipe 1 and receiver 22 in the suction pipe 5
For example, a hose is used for the part between the suction pipe 5 and the inside of the buried pipe 1, and a pipe unit and a joint for interconnecting the pipe units are used for the part inside the buried pipe 1.

A plurality of air supply pipes 24 having an air supply port 23 opening into the truncated conical front chamber of the excavation and soil removal chamber 2 are provided around the blade mouth 3, and the air supply pipes 24 are provided at the rear of the blade mouth 3. 24, the other end of the branch pipe 25 is connected to the air supply header 26, and the air supply whose one end is connected to the air supply header 26 is connected. The other end of the hose 27 is connected via a pressure regulating valve 29 to a compressed air supply source consisting of a compressor 28 installed on the ground. The air pressure detector 30 for detection is installed, and the air pressure is detected so that the air pressure inside the excavation and earth removal chamber 2 reaches an appropriate setting value that is equal to or higher than the earth pressure of the ground in front of the excavation and earth removal chamber 2. The pressure regulating valve 29 is automatically controlled by the device 30 via the control device.

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

An air suction pipe 33 of a vacuum pump 32 driven by an electric motor 31 installed on the ground connects to the receiver 22.
A rotary valve 34 is connected to the upper part of the receiver 22 and a rotary valve 34 is connected to the lower part of the receiver 22. Furthermore, one end of a conveyor 35 for transporting earth and sand is arranged at the lower part of the rotary valve 34, and the other end of the conveyor 35 is a conveyor 34 for transporting earth and sand. It is located above the loading platform of the truck 36.

In the illustrated device, when the cutter driving hydraulic motor 18, compressor 28, vacuum pump 32, and rotary valve 34 are operated, and when the propulsion jack 9 of the propulsion device 10 propels the buried pipe 1, cutter mouth 3, etc. The earth and sand in front of the mouth 3 is excavated by the cutter arm 14 of the cutter 4 with a feed blade and is transferred to the rear of the excavation and earth removal chamber 2 by the feed blade 17. In this case, since air pressure equal to or higher than the earth pressure is acting on the ground in front of the excavation and removal chamber 2 from the excavation and removal chamber side, the earth is excavated and removed from the earth removal opening 15 of the earth retaining plate 16. A large amount of earth and sand will not fall into the chamber 2, that is, the amount of earth and sand taken into the excavation and earth removal chamber 2 will not become excessive.

The earth and sand transferred to the rear part of the excavation earth removal chamber 2 is moved by the vacuum suction force inside the suction hole 21 and the suction pipe 5.
The earth and sand is sucked and conveyed with air and thrown into the receiver 22, and the earth and sand thrown into the receiver 22 is discharged to one end of the earth and sand conveyor 35 through the rotary valve 34, and is loaded onto the truck 36 by the conveyor 35. .

In the case of the embodiment described above, the cutting edge 3 is fitted to the front end of the buried pipe 1 at the frontmost position, but instead of this, for example, a leading pipe is connected to the front end of the buried pipe 1 at the frontmost position. , the cutting edge 3 may be fitted into the front end of the leading tube. Moreover, as the air pressure detector 30, one having any known structure may be used.

〔Effect of the invention〕

According to this invention, a buried pipe 1 that is propelled underground
A blade opening 3 having an excavation and discharge chamber 2 that is open toward the front is fitted in the front end of the excavation and discharge chamber 2, and earth and sand are excavated by a cutter 4 with a feed blade that rotates at the front of the excavation and discharge chamber 2. The earth and sand in the excavation and removal chamber 2 are transferred to the rear part of the excavation and removal chamber 2, and by the vacuum suction force in the suction pipe 5 connected to the rear lower part of the excavation and removal chamber 2, the earth and sand in the excavation and removal chamber 2 is suctioned and transferred along with air inside the suction tube. Therefore, the earth and sand excavated by the cutter 3 with a feed blade and transferred to the rear part of the excavation and removal chamber 2 can be discharged to the ground by wind power, and the excavated earth and sand are mixed with water. There is no need to install large-scale muddy water treatment equipment on the ground, unlike the conventional construction method, which involves discharging muddy water as muddy water, so the working space on the ground is small, equipment costs are low, and a large amount of treated water can be produced. There is also no need for a release location. In particular, in the case of this invention, compressed air is supplied into the excavation and earth removal chamber 2, and the air pressure inside the excavation and earth removal chamber 2 is maintained at a level equal to or higher than the earth pressure at the front of the excavation and earth removal chamber. Since the excavation is carried out while preventing the ground from collapsing, the amount of earth and sand taken into the excavation and removal chamber 2 will not become excessive, and therefore the suction pipe 5 will be prevented from being clogged with earth and sand, and the process will be carried out smoothly. Effects such as being able to suction and remove soil can be obtained.

[Brief explanation of drawings]

The drawings show embodiments of the invention,
FIG. 1 is a longitudinal side view showing a part of the apparatus used in carrying out the present invention, FIG. 2 is a longitudinal side view showing an enlarged part of FIG. 1, and FIG. −
A cross-sectional view taken along line A, Figure 4 is a front view of the part shown in Figure 2 seen from the left, Figure 5 is a vertical side view showing the connecting part of the buried pipe, and Figure 6 is the underground pipe being pushed underground. FIG. In the figure, 1 is a buried pipe, 2 is an excavation and removal room, and 3
is the blade mouth, 4 is the cutter with a feed blade, 5 is the suction pipe,
6 is a starting shaft, 9 is a propulsion jack, 10 is a propulsion device, 12 is a cutter shaft, 14 is a cutter arm,
17 is a feed blade, 18 is a hydraulic motor for driving the cutter, 19 is a liquid supply hose, 20 is a drain hose, 21
is a suction hole, 22 is a receiver, 23 is an air supply port, 24
is an air supply pipe, 27 is an air supply hose, 28 is a compressor, 29 is a pressure regulating valve, 32 is a vacuum pump, 34
is a rotary valve, and 35 is a conveyor for transporting earth and sand.

Claims (1)

[Claims] 1 A cutter opening 3 having an excavation and removal chamber 2 that is open toward the front is fitted to the front end of a buried pipe 1 that is propelled underground, and the inside of the excavation and removal chamber 2 is supplied from a compressed air supply source. Supply compressed air to the excavation and removal chamber 2.
Excavating earth and sand from the cutter 4 with a feed blade rotating at the front part of the excavation and earth removal chamber 2 and transferring it to the rear while keeping the air pressure inside the earth pressure equal to or higher than the earth pressure at the front of the earth excavation and earth removal chamber 2, Burial is characterized in that the earth and sand in the excavation and earth removal chamber 2 are suction-transferred through the suction pipe 5 along with air and discharged by the vacuum suction force in the suction pipe 5 connected to the rear lower part of the earth and earth excavation chamber 2. Pipe underground propulsion method.