JPS63165697A - Method of curve 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] The present invention relates to a pipe propulsion method for laying longitudinally curved pipes underground using a trenchless method.

[Conventional technology]

As a method for laying buried pipes, a trenchless method for advancing buried pipes is widely used.

In such a trenchless propulsion method, if there is an obstacle such as a structure at the buried location, it is safe to avoid this and lay the pipe in a curved shape. Figures 8 to 10 show how such curved pipes α are buried.

Conventionally, as a method of laying such curved pipes,
The pipe propulsion method shown in Japanese Patent Laid-Open No. 58-13898 and No. 7928 is known.

The former method involves press-fitting a curved pipe at a predetermined angle.
An auger connected with a universal joint is rotated within the five-bent pipe to excavate and remove soil, thereby burying the bent pipe underground. The latter method uses a hydraulic motor-driven bit attached to the tip of the pipe to excavate underground to a diameter larger than the outside diameter of the pipe, and propels the pipe while removing soil with circulating water. This is to be buried.

[Problem that the invention seeks to solve]

However, these propulsion systems do not have a direction correction function, and the curved pipe is forced into the ground using only its curvature as a guide, so there is a problem that the directionality is lost as the propulsion distance increases.

The present invention has been made in view of these conventional problems and aims to provide a propulsion method that can lay a curved pipe while easily and appropriately correcting the direction.

[Means for solving problems]

For this reason, the present invention uses an outer tube that is curved in the longitudinal direction and an inner tube that is curved in the longitudinal direction and has a tip-driven drill at its tip, and propels the outer tube while drilling with the drill that protrudes from the tip of the outer tube. At the same time, the direction correction during cutting is performed by making the tip of the inner tube eccentric with respect to the outer tube using a guide provided inside the outer tube tip. If the drill is driven with the inner pipe eccentric, the drill will excavate more ground on the eccentric side, and the outer pipe will be propelled in the direction inward due to the space created by the excavation and the ground reaction force. Corrected in the eccentric direction of the tube.

〔Example〕

Figures 1 to 3 show one implementation state of the present invention, in which (1) is a curved outer pipe (pipe to be buried), (2) is an inner pipe, and (3) is a curved pipe at the tip of the inner pipe. The provided tip drive type drill (31) is a rotating part at the tip of the drill, and the rotating part (31) has a pilot bit (4) at the tip and can be raised and lowered at multiple locations in the circumferential direction. (
5). This retract bit (5) enlarges the hole drilled by the pilot bit (4) to a diameter larger than the outer diameter of the outer tube. Further, the outer tube (1) has an outer tube shoe (13) at its tip, and the original buried tube is connected to the rear end of the outer tube shoe (13).

In the present invention, a tip-driven drill (
The rotary part (31) of 3) is made to protrude from the tip of the outer tube, and the inner tube and the outer tube are propelled while excavating underground with its pilot bit (4) and retract pit (5). The inner tube and outer tube can be propelled by, for example, first propelling the inner tube (2) and drilling a predetermined length with a drill, and then propelling the outer tube (1), or by moving the inner tube (2) and Outer tube (1) at the same time'
Any of the following methods may be used.

In addition, the excavation water used for such excavation is within gf2)
Sludge water, including waste water, is supplied to the front surface of the pilot bit (4) through the pipe and discharged through between the outer pipe (1) and the inner pipe (2).

In addition, stabilizers (9) are protruded at multiple locations in the circumferential direction of the outer tube shoe α, and the outer tube (1) being propelled by the stabilizers (9) is expanded by the retract pit (5). The outer tube is located at the center of the excavated hole and prevents the end of the outer tube from penetrating into the soil.

If it becomes necessary to correct the propulsion direction during such excavation, the tip of the inner tube is made eccentric with respect to the outer tube by means of a guide ζ provided inside near the tip of the outer tube.

Figures 2 and 3 show an example of the implementation status.
A pair of guide portions (6) are provided on both sides of the inner surface near the tip of the outer tube (1) to face each other so as to be inclined with respect to the axis of the outer tube. In this embodiment, the guide part (6)
is constituted by a guide groove (7). Further, a pair of guided bodies (8) that can be guided by the guide groove (7) are provided. This guided body (8) is constituted by an arm body that can be slidably fitted into the guide groove (7).

Normally, the outer tube (1) is propelled so that its guide portions (6) are located on both sides in the horizontal direction and tilted in the vertical direction. When the guided body (8) of the inner tube (2) is located at the center of the guide part (6) as shown in Fig. 2(a), the tube axis of the inner tube (2) is aligned with the outer tube (1). The drill excavates the ground along the extension of the outer tube axis.

On the other hand, when correcting the excavation direction upward, the inner pipe (2)
is moved forward in the axial direction of the outer tube.

In this way, as shown in Fig. 2(b), the guided object (8)
As the inner tube (2) slides while being pushed upward along the guide part (6), the inner tube (2) becomes eccentric upward with respect to the outer tube (1), and the drill excavates the upper side of the ground more than before, causing the drill to move forward. The direction of propulsion of the outer pipe (1) is adjusted upward due to the space created by the excavation and the ground reaction force.

In addition, when correcting the excavation direction downward, conversely, the inner pipe (
2) and remove the inner tube (2) as shown in Figure 2(c).
is eccentrically downward with respect to the outer tube (1). As a result, the drill excavates the lower part of the ground, and the direction of movement of the outer pipe (1) is corrected downward.

In order to move the inner tube (2) back and forth during such vertical correction, as shown in FIG.
This is done by connecting U with a cylinder device a (hydraulic cylinder) and moving the inner tube with the cylinder device α.

The above is a correction in the vertical direction of the propulsion direction, but when making a correction in the left-right direction (horizontal direction), Fig. 5 (a) and (
As shown in b), the length of the guided body (8) is changed on the left and right sides, and by doing this, the inner tube (2
) is eccentric in the horizontal direction with respect to the outer tube (1). Due to such eccentricity, the propulsion direction is corrected in the left-right direction based on the same principle as described above. Therefore, by adjusting the length of the guided body and selecting the position of the guided body in the longitudinal direction of the guide length described above, the propulsion direction can be corrected in any direction.

In addition, when making corrections in the left-right direction, use an inner tube as shown in Fig. 3 (inner tube with guided bodies of the same length on the left and right sides).
Once removed, the guided body (8) is shown in Figure 5 (A).
Or replace it with something like (b) and reinsert it.

The above is a basic and preferable correction method, but for example,
The manner of use is as described above, such as using the outer tube (1) rotated 90 degrees from the state shown in FIGS. 2 and 3, that is, with the guide portion (6) positioned above and below. It is not limited to the examples. FIG. 6 shows an example (horizontal sectional view) of this, in which the guide parts (6) are located above and below, and the guided body (8) is guided by the guide parts (6), so that the inner tube (2) is eccentric in the horizontal direction with respect to the outer tube (1), and the propulsion direction is corrected in the horizontal direction. Regarding correction in the vertical direction, as shown in FIGS. 7(a) and (b), the length of the guided body (8) is made different between the upper and lower sides,
This can also be done by eccentrically moving the inner tube in the vertical direction.

In addition to the above-mentioned embodiments, for example, there may be a structure in which a guide section in the form of a guide rail is provided, and the guided object is sandwiched between the guide rails from both sides, or a structure in which the guide section is simply slid on the upper surface of the guide rail. Can be used.

Further, as the drive motor of the tip-driven drill (3), a water pressure motor, a hydraulic motor, an electric motor, an air hammer, etc. can be used, but when a water pressure motor is used,
There is an advantage that the drilling water can be used as driving water.

Further, the discharge may be performed by suctioning with a vacuum pump.

Moreover, the above-mentioned direction correction is performed based on the detection result of a position detection device sent through the inner tube.

The construction method of the present invention is applicable not only to ordinary buried pipes but also to piles, underground measurement poling holes, etc.

〔Effect of the invention〕

According to the present invention described above, it is possible to install a curved pipe while easily and appropriately correcting the direction.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention,
Fig. 1 is an overall explanatory diagram, Fig. 2 (a) to C) is an explanatory diagram showing a method of correcting the propulsion direction, and Fig. 3 is a sectional view taken along line 1-III in Fig. 2 (a). . FIG. 4 is an explanatory view showing an example of a mechanism for moving the inner tube forward and backward relative to the outer tube in carrying out the present invention. FIGS. 5(a) and 5(b) are explanatory diagrams showing a method of eccentricizing the inner tube in the left-right direction. FIG. 6 is an explanatory diagram showing another example of a method for correcting the propulsion direction, and FIGS. 7(a) and (b) are explanatory diagrams showing a method for vertically eccentricizing the inner pipe in the correcting method. FIG. 8, FIG. 9(a)e(b), and FIG. 10 are explanatory diagrams showing an example of laying a curved pipe. In the figure, (1) shows the outer tube, (2) the inner tube, (3) the tip-driven drill, and (6) the guide part. Patent applicant: Nippon Steel Tube Co., Ltd. Koken Drilling Industry Co., Ltd. Inventor: Kodama
Tadashi Arai spread out
Takashi Kimura Hirodo Hajime Eto Hana
1) Mainly assigned to Shuyasu Okamura Patent attorney Yoshihara
Ministry of Health and Welfare Same as Tomabechi Masatoshi Toshitoshi Lawyer Hiroko Yoshihara－■ ``0 Ward Tomi－

Claims (1)

[Claims] (1) Using an outer tube that is curved in the longitudinal direction and an inner tube that is curved in the longitudinal direction and has a tip-driven drill at its tip, while drilling with the drill protruding from the tip of the outer tube. It is characterized by propelling the outer tube and correcting the direction during cutting by making the tip of the inner tube eccentric with respect to the outer tube using a guide provided inside near the tip of the outer tube. Curved propulsion method. (2) By slidably engaging the guided body provided on the inner tube with a guide section inside the outer tube that is non-parallel to the outer tube axis, the tip of the inner tube can be attached to the outer tube. The curved propulsion method according to claim (1), characterized in that the method is eccentric. (3) The curved propulsion construction method according to claim (2), characterized in that guided objects on both sides of the inner tube are guided by guide portions provided facing the inner surface of the outer tube. (4) The curved propulsion construction method according to claim (3), characterized in that the lengths of the guided bodies on both sides are made different, and the inner tube is eccentric to the shorter guided body side with respect to the outer tube.