JPS62296099A - Centering mechanism of drilling shaft - 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] 3. (Industrial Application Field) The present invention is applicable to construction work in which the inside of an old pipe is scraped off to repair the inside of the old pipe, or to replace it with a new pipe, or to cut out the inside of an old pipe in a substantially straight line underground. This invention relates to excavation shafts used in construction work such as creating tunnels for piping.

(Prior art) When it is necessary to scrape off the inside of a buried pipe or crush a buried pipe because the telephone line, electric wire, gas pipe, etc. buried underground has become obsolete or the capacity is insufficient. , a construction method in which a head for crushing or excavating old pipes (hereinafter simply referred to as the head) is pulled by a wire from the front and inserted into the old pipe while being rotated by a shaft from the rear to crush or excavate the old pipe. The inventors have already introduced it. (Unexamined Japanese Patent Publication No. 61-82086) (Problems to be Solved by the Invention) However, when the inventors were replacing old piping with the above method, the following problems arose.

In other words, if a part of the old pipe is slightly misaligned, or if there is a hard part of the old pipe that protrudes slightly inward, the head may temporarily move in a bent direction due to the influence of the old pipe. Although it is unavoidable for the head to move in a slightly curved direction, the shaft that is pushing the head from behind tends to turn in the opposite direction, that is, directly behind the head. When the head is pressed by the shaft, the shaft primarily pushes the head in its curved direction, so
A problem arises in that the direction of movement of the head does not return to its original correct direction due to the temporary influence of the eye piping.

(Means and effects for solving the problems) The present invention eliminates the above-mentioned disadvantages in the method of replacing eye piping,
Even if there is a slight deviation in the position of the eye pipe or a hard protruding part inside, the shaft pushing the head from behind should be Attach a centering device so that the shaft is located in the center of the eye pipe without changing its position as much as possible, and presses the head in the direction of travel of the eye pipe, so that the direction of travel of the head is adjusted. It is intended to be maintained.

(Example) The present invention will be described in detail below using examples shown in the drawings.

In Fig. 1, an eye pipe 2 is buried underground from manhole 1 to manhole 1', and in order to renew this eye pipe, eye pipe 2 is excavated from manhole 1 to manhole 1'. FIG.

The head for crushing the eye pipe 2 or scraping the inside of the eye pipe 2 has, as shown in the side view in FIG.
A wire 6 is attached to the twist prevention device 5 attached to the tip of the head 3, and the wire 6 is inserted into the manhole 1' shown in FIG. At the same time, the head 3 is pushed into the position where the eye pipe 2 was while being rotated by a drive device 9 installed in the manhole 1 via a shaft 8. After the shaft 8 has pushed in the head 3 by a certain length, the connecting fitting 10.10 with a built-in universal joint is shown in side view in FIG.
' to connect another shaft 8 and push it in again using the drive device 9.

In the embodiment shown in FIGS. 1 and 2, the new pipe 11 is attached to the rear of the head 3, and the head 3 is connected to the eye pipe 2.
This is a diagram showing a case where new piping 11 is installed immediately after the earth and sand are crushed and removed by pushing them into underground 1. On the other hand, FIG. 3 shows an embodiment of a construction method in which the inside of the eye pipe 2 is scraped off and the inner wall of the eye pipe is later repaired and reinforced to increase the capacity of the pipe.

By the way, in such a shaft, if the traveling direction of the head 3 bends even a little due to the reasons mentioned above, the shaft 8 will follow this and press the head 3 in the bent direction for the reasons mentioned above. Tend.

In order to prevent this, the present invention is designed so that the position and direction of movement of the shaft do not change even if the direction of movement of the head changes temporarily.

For this purpose, as shown in FIG. 3, it is necessary to provide a centering mechanism in the main part of the shaft 8 to hold the shaft 8 in a fixed position.

As shown in a conceptual side view in FIG. 4, the centering mechanism of the present invention has a ring 12 rotatably attached to a shaft 8 via a bearing 13.
2 has three armrests 14.14'..., Pol)
15, and the arm bar 14.14'...
The rollers 16, 16, . . . are attached to the tips of the rollers 16, 16, . . . by means of roller shafts 17, 17', .

As shown in the figure, the arm 14 projecting downward is fixed to the ring 12 by 18 bolts in addition to the bolts 15, but the arm 14' projecting upward is , is attached so as to be rotatable outward around a bolt 15, and is pressurized by a spring cylinder 19 so that the arm 14', which projects upward, always expands upward. Therefore, if there is no resistance to the pressurization, the arm 14' will expand outward as shown by the dotted line in the figure.

FIG. 5 shows that the roller I is moved by the spring cylinder 19.
7 is a cross-sectional conceptual diagram of a plane perpendicular to the shaft 8 showing a state in which the shaft 7 is expanded upward, but even if the hole 20 drilled by the head 3 (description of the spring cylinder etc. is omitted) becomes larger, The rollers 16 are pressed upward by the force of the spring cylinder 19, so that there is no gap between each roller 16, 16', etc. and the hole 20 drilled by the head 3, so that the shaft 8 The shaft 8 is always held at the center of the hole 20 drilled by the head 3, and even if the head 3 moves in an abnormal direction due to breakage of the old pipe, etc., the shaft 8 that presses the head 3 from behind will remain Since the head is correctly held at the center of the position where the eye pipe 2 was, the head is pressed in the correct direction and extreme distortion in the direction of movement of the head 3 is prevented.

In this case, since the roller 16 attached to the tip of the arm 14 faces in the direction of movement of the head 3, its vertical position is maintained by the bearing 13 despite the rotation of the shaft 8. .

However, if it appears that the vertical position of the arm 14 cannot be maintained completely due to the length of the tunnel, etc., the arm 14 may be maintained vertically using another holding member, such as a rod.

Above, an example has been described in which a spring cylinder 19 is attached to push the arm 14' outwardly, which projects upwardly among the arms 14, 14', . . . of the roller 16. If there is no abnormality in the eye pipe 2, remove all the arms 14 as necessary. '14'
. . . may be fixed to the ring 12, and it is expected that the hole 20 cut by the head will be extremely thick (or thin) due to the relationship with the surrounding soil quality. If the arm is 14.14'...
For all of the above, the spring cylinder 19 is attached in the same way as explained for the arm 14', and the rollers 16, 16', etc. constantly press the hole 20 cut in the upper, lower, left and right directions from the inside. It may be configured to do so.

From the experience of the inventors in implementing the present invention, the eye pipe 2
Even if the shaft 8 has a curve of a certain radius, it is better to position the shaft 8 at the center of the pipe 2 or the hole 20 drilled through it and press the head 3 to achieve the centering mechanism of the present invention. It seems that the head 3 can be guided correctly along the center of the eye pipe 2, rather than something lacking.

Note that the centering mechanism of the present invention allows the roller 16 to
As a structure in which the arms 14 and 14' to which the arms are attached are opened outward by the force of a spring, the arms 14 and 14' are attached to
In addition to configuring the angle 4' to open outward, the arm 1
It goes without saying that the length of 4' may be designed to extend outwardly by the force of the spring.

(Effects of the Invention) Since the present invention is configured and operates as described above, the shaft 8 for pressing the head 3 from the rear is always held at the center of the hole 20 cut by the head 3. Therefore, the head 3 may be damaged due to abnormalities in the eye pipe 2 or obstacles such as hard stones in the case of new tunnel excavation.
Even if the direction of movement of the shaft 8 is slightly deviated, the shaft 8 does not follow this movement, but instead maintains its correct position and presses the head 3, thereby preventing the head 3 from moving further in a distorted manner. At the same time, even if the eye pipe 2 is somewhat curved, it prevents the shaft 8 from coming into contact with the newly drilled hole 20, and together with the fact that the rotational friction of the rollers 16 and 16' is minute, This also has the effect of reducing the power required by the drive device to advance the shaft 8.

[Brief explanation of the drawing]

FIG. 1 is a conceptual side view showing a state in which an underground pipe is being excavated by implementing the present invention. Figure 2 is a side view of the drilling head. FIG. 3 is a side view showing the use of the centering mechanism of the present invention in excavation work for old pipes. FIG. 4 is a side view of a centering mechanism capable of implementing the present invention. FIG. 5 is a front view of essential parts of the centering mechanism shown in FIG. 4.

Claims (1)

[Claims] 1) In a device that presses an excavation head with a shaft for crushing or excavating old pipes or excavating a new tunnel, a ring rotatably attached to the shaft is rotated in the advancing direction. A centering mechanism for an excavating shaft, which is made up of multiple arms equipped with rollers. 2) The centering mechanism for an excavating shaft according to claim 1, wherein there are three arms, of which only the arms that protrude upward are configured to open outward by the force of a spring. 3) The centering mechanism for a digging shaft according to claim 1, wherein all of the plurality of arms are configured to open outward by the force of a spring.