JPS63210396A - Method and device for water jet propulsion construction - Google Patents

Abstract

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

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention is applicable to the excavation and construction of underground pipes or conduits for lifelines such as telecommunication cables, optical communication cables, gas vibrating lines, and water and sewage lines. The present invention relates to a water jet propulsion method and its equipment.

[Conventional technology]

Conventionally, when planning underground pipes or conduits, if the diameter of the pipe is small, for example, if it is less than 800 mm, it is impossible to work manually at the face, and furthermore, in urban areas,
The open cut method cannot be used due to narrow roads, high traffic volume, and pollution problems related to noise and vibration, so the small-diameter propulsion method is used.

There are various small-diameter propulsion methods, but most of them are one-dimensional (straight line) propulsion, and some are equipped with a device to control the direction, but the direction control is straight-line propulsion. It is used to correct the direction of propulsion when it deviates from a straight trajectory, so it can only be used when there are no obstacles within the planned line.

In addition, as a method of two-dimensional propulsion while avoiding obstacles, for example, "Civil Engineering + Vol. 39, No.

10, pp. 78-83 1-tube easy arc propulsion method, 1982
The one published by Civil Engineering Company on October 1, 2008 is known.

In this conventional construction method, pipes are moved from ground surface to ground surface in an arc shape with a constant curvature or radius of curvature.

[Problem that the invention seeks to solve]

However, in this conventional propulsion method, the pipe is propelled from ground surface to ground surface in an arc shape with a constant curvature, so there is a limit to the curvature, and pipes with large curvature cannot be moved. It is difficult to propel the vehicle, and if there are obstacles in the way of propulsion, it is impossible to avoid them and propel the vehicle, and the problem is that it can only be used in special cases with extremely short spans. Ta.

This invention was made by focusing on such conventional problems, and it is possible to minimize the curvature (i.e., the small radius of curvature).
It is possible to excavate and lay small-diameter underground pipes or conduits over a relatively long span using a three-dimensional route with
Furthermore, it is an object of the present invention to provide a water jet propulsion method and apparatus thereof which are simple in operation and structure and have little risk of failure.

[Means for Solving the Problems] Therefore, the water jet propulsion method of the present invention involves shaking the movable part forming the front side of the leading pipe with respect to the fixed part forming the rear side of the leading pipe in the propulsion direction. Attaches freely,
Push the leading pipe from behind to give thrust to the leading pipe,
A drilling hole is excavated by injecting high-pressure water from inside the movable part to the front outside of the movable part through a front injection port formed at the tip of the movable part, and from inside the movable part to the side of the movable part. The direction of the movable part is controlled by injecting high-pressure water to the outside of the movable part through a side injection port formed in the movable part.

In addition, in the water jet propulsion device of the present invention, the movable part forming the front side of the leading pipe is swingably attached to the fixed part forming the rear side of the leading pipe in the propulsion direction. A thrust means for pushing from the side is arranged, a front injection port is formed in front of the movable part for ejecting high-pressure water from the inside of the movable part to the front outside, and the high-pressure water is sprayed to the side of the movable part. It is constructed by forming a side injection port that injects from the inside of the part to the outside laterally.

[Effect]

According to the water jet propulsion method and device of the present invention, the leading pipe is pushed from the rear side by the thrust means to apply thrust to the leading pipe, and high-pressure water is pumped from inside the movable part that constitutes the front side of the leading pipe in the direction of propulsion. An excavation hole is excavated by injecting water to the front outside of the movable part through a front injection port formed in the front part of the movable part, and a side part in which high-pressure water is formed on the side of the movable part from inside the movable part. The direction of the movable part is controlled by injecting it to the outside of the movable part through the injection port.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

First, the configuration will be explained.

In Fig. 2, ■ is a leading pipe, 2a and 2b are guiding pipes, leading pipe 1 and guiding pipe 2a are connected by a flexible joint 3a, and guiding pipe 2a and guiding pipe 2b are connected by a flexible joint 3b. Concatenated.

The flexible joints 3a and 3b will be described later.

4 is a shaft, and in this shaft 4, the guide pipe 2b
A hydraulic jack 6 is disposed between the rear end and the pressure plate 5,
Further, 7 is a waterway that supplies high-pressure water, and 8 is a sludge pump that discharges the pickpocket.

In FIGS. 1 and 2, the guide pipe 1 is composed of a fixed part 10 on the rear side in the propulsion direction (direction A) and a movable part 11 on the front side. The point 12 is connected to the fixed part 10 so as to be swingable in all directions at a predetermined angle, for example, about 15 degrees, with respect to the axis of the fixed part 10,
Furthermore, the central waterway 13 of the fixed part 10 and the central waterway 14 of the movable part 11 are also connected by a ball joint 15 in a freely swingable and watertight manner. Also, the central waterway 16 of the guiding pipe 2a and the central waterway 13 of the fixed part 10 of the leading pipe 1 are also connected to the pole join 1.
-17, they are swingably and watertightly connected.

The details of these ball joints 12, 15, and 17 are shown in FIG. 3, which shows that a socket 21 is attached to the outer periphery of a ball 19 fixed to the end of one central waterway with a packing 20 interposed. The socket 21 is rotatably fitted and
The retainer flange 23 is applied to the flange portion 21a formed in the shim 22 via the shim 22, and the flange portion 21a and the retainer flange 23 are fixed by bolts 24 and nuts 25, and each ball joint 1-12.15.17 is configured.

Returning to FIGS. 1 and 2, at the front end of the movable part 11 of the leading pipe 1, there is a front end injection port 27 that communicates with the central waterway 14.
, and a front oblique injection port 28 that communicates with the central waterway 14 is also formed in the conical front side. Similarly, a plurality of side injection ports 30 communicating with the central waterway 14 are formed on the sides of the movable part 11, and each side injection port 30
A solenoid valve 29 is interposed.

Further, the inside of the fixed part 10 and the inside of the movable part 11 of the leading pipe 1 are connected by a damper 32 and a rod 33.

This damper 32 damps the movement of the rod 33, that is, the movable part 11, and is also provided with a sensor that detects the swing angle of the movable part 11 with respect to the fixed part 10 based on the displacement of the rod 33. and rod 33
This prevents rocking movements beyond a predetermined limit.

FIG. 4 shows the flexible joints 3a and 3b mentioned above.
For example, there is a flexible joint 3a between a bracket 34 fixed to the inside of the tube end of the fixed part 10 of the guide tube 1 and a bracket 35 fixed to the inside of the tube end of the guide tube 2a. It is stretched and fixed with bolts 36 and nuts 37. This flexible joint 3
The material for a may be, for example, stainless steel plate lined with rubber, hard resin, or the like. Furthermore, cushioning materials 38 and 39 are fitted to the fixed portion 10 and the tube ends of the guide tube 2a, respectively.

Further, a transmitter 41 is disposed inside the movable part 11, and wiring for the transmitter 41 and the solenoid valve 29, or the swing angle sensor using the rod 33 is connected to the guide tube 1, the guide tube 2a,
It is passed through the inside of 2b.

Next, the operation of the above embodiment will be explained.

Referring to FIG. 2, in the shaft 4, when the rear end of the guide pipe 2b is pushed with the hydraulic jack 6, the guide pipe 2b is released.

An axial thrust A acts on 2a and the leading pipe 1.

At this time, the flexible joints 3a and 3b contract, and the cushioning materials 38 and 39 fitted to the ends of the guide tubes 2b and 2a and the leading tube 1 come into contact with each other, thereby transmitting thrust.

While applying thrust to the guide pipes 2b, 2a and the leading pipe 1 in this way, high pressure water discharged from the compressor (not shown) is transferred from the water channel 7 to the central water channel of the guide pipe 2b and the guide pipe 2a.
is supplied to the central waterway 16 of the main pipe 1 and the central waterways 13 and 14 of the leading pipe 1, and is ejected from the front tip injection port 27 and the front diagonal injection port 28 of the movable part 11 to hydraulically jack the ground in front of the movable part 11. Excavation is performed using the thrust of No. 6 and the jet power of high-pressure water. At this time, if all the solenoid valves 29 are closed, the leading pipe 1 moves straight in the direction of the thrust, as shown in FIG. 5 (al).

The high-pressure water injected from the front tip injection port 27 and the front oblique injection port 28 is also used as a carrier fluid for the pickpocket, and the pickpocket discharged as slurry is transported by the high-pressure water to the leading pipe 1, the guiding pipe 2a, After flowing along the outer wall of 2b and being pumped up by the sludge pump 8, the water passes through a vibrating sieve (not shown), a primary sedimentation tank, a cyclone, a secondary sedimentation tank, and a condensate pump compressor, where it is circulated as high-pressure water and reused. be done.

Next, when a predetermined solenoid valve 29 is opened, the opened solenoid valve 2
High-pressure water is injected from the side injection port 30 that communicates with the side injection port 30 through the injection port 9, and as shown in FIG. move,
The direction of the movable part 11 changes to the direction of the resultant force of thrust and reaction force.

At this time, as shown in FIG. 6, the fixed part 10 and the movable part 1
1 is damped by the damper 32, thereby preventing the rotational movement of the movable part 11 relative to the fixed part 10, and the displacement of the rod 33 changes the swing angle of the movable part 11, that is, the direction of the movable part 11. is detected. Also,
The damper 32 and rod 33 prevent rocking motion exceeding a predetermined limit.

With the direction of the movable part 11 changed, when the solenoid valve 29 is closed and thrust is applied by the hydraulic jack 6, as shown in FIG.
), the fixed part 10 and the movable part 11 are in a straight line state, and an angle is formed between the fixed part 10 and the guide tube 2a, and the flexible gigoin (3a) expands and contracts to connect with the fixed part 10. Parts of the cushioning materials 38 and 39 at the ends of the guide tube 2a come into contact with each other, thereby transmitting thrust. and,
The movable part 11 is propelled in the direction of the resultant force of the thrust force and the drag force received from the ground.

In this way, the rocking angle of the leading pipe 1 is measured by the rocking angle sensor attached to the rod 33, and the position of the leading pipe l is measured by the transmitter 41, and the excavation is finished from the shaft on the starting side. A three-dimensional winding borehole is formed up to the side shaft in a predetermined three-dimensional curved shape or while avoiding obstacles. Then, flexible joints 3a and 3b were installed to correspond to the winding drilling hole.
The guide tubes 2a and 2b connected by the guide tubes 2a and 2b follow. As the leading pipe 1 advances, the guiding pipe 2a.

Add guide pipes one after another to the rear side of 2b, and when the guide pipe 1 reaches the end shaft, remove the guide pipe 1 from the guide pipe 2a and excavate the guide pipes 2a, 2b, etc. as they are. Leave it in the hole.

Further, various operating conditions such as the straight-line digging force and directional control by the guide pipe, and the transporting force of slurry can be easily controlled by adjusting the pressure and flow rate of high-pressure water.

Further, when the excavation is completed, cement milk is injected into the gap between the excavation hole and the guide pipe 23 to counteract the pressure of the ground and ensure a pipe or conduit with a constant cross-sectional area.

〔Effect of the invention〕

As explained above, according to the water jet propulsion method and its device according to the present invention, a three-dimensional route with as large a curvature as possible (that is, a small radius of curvature), avoiding underground obstacles, and It is possible to lay small-diameter pipes or conduits over long spans, and it is possible to construct pipes with a constant cross-sectional area on any route as long as the curvature is below a certain level. The effect is that it is simple and there is less risk of failure.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing the configuration of essential parts of an embodiment of a device for realizing the water jet propulsion method according to the present invention, Fig. 2 is a perspective view showing the overall structure of the embodiment, and Fig. 3 is a ball FIG. 4 is an enlarged sectional view showing details of the joint, FIG. 4 is an enlarged sectional view showing details of the flexible joint, FIG. 5 is an overall perspective view for explaining the operation of the above embodiment, and FIG. 6 is a damper and rod. FIG. 1... Leading pipe, 2a, 2b = guiding pipe, 3a, 3b...
・Flexible joint, 4... Vertical shaft, 5... Pressure plate, 6... Hydraulic jack, 8... Sludge pump, 1
0... Fixed part, 11... Movable part, 12, 15.17
...Ball joint, 19...Ball, 21...
・Socket, 23... Retainer flange, 27...
Front tip injection port, 2゛8... Front oblique injection port, 29.
... Solenoid valve, 30... Side injection port, 32... Damper, 33... Rod, 38° 39... Cushion material,
41... Transmitter.

Claims (2)

[Claims] (1) A movable part forming the front side of the leading pipe is swingably attached to a fixed part forming the rear side in the direction of propulsion of the leading pipe, and thrust is applied to the leading pipe by pushing the leading pipe from behind. and excavating an excavation hole by injecting high-pressure water from the inside of the movable part to the front outside of the movable part through a front injection port formed at the tip of the movable part, and from the inside of the movable part to the movable part. A water jet propulsion method in which the direction of the movable part is controlled by injecting high-pressure water to the outside of the movable part through a side injection port formed on the side of the movable part. (2) A movable part forming the front side of the leading pipe is swingably attached to a fixed part forming the rear side in the direction of propulsion of the leading pipe, and thrust means for pushing the leading pipe from the rear side is arranged. ,
A front injection port is formed in the front part of the movable part for ejecting high-pressure water from the inside of the movable part to the front outside, and in a side part of the movable part, the high-pressure water is jetted from the inside of the movable part to the lateral outside. A water jet propulsion device configured by forming a side injection port.