JPH026153Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a propulsion tube direction correction device.

When propelling a steel pipe or the like underground as shown in Figs. 1 and 2, the direction of the propulsion pipe is conventionally corrected to ensure linear accuracy at the tip end b of the propulsion pipe a as shown in Fig. 1. This is accomplished either by utilizing the shape of the propulsion tube a or by rotating the propulsion tube a as shown in Figure 2, but in the former case, the straightness is constantly affected by the shape of the tip end surface of the propulsion tube during propulsion. In the latter case, there are concerns that it may not be possible to repair it due to the influence of the surrounding ground and lack of rigidity of the propulsion tube.

The present invention was proposed in order to eliminate such drawbacks, and includes a propulsion tube, an inner tube having a screw blade rotatably and slidably disposed within the propulsion tube, and a distal end portion of the propulsion tube. A propulsion device comprising: a plurality of movable plates rotatably mounted on the inner tube; and an engaging portion disposed at the tip of the inner tube and selectively engaging and disengaging from one of the movable plates. This relates to a pipe direction correction device.

Since the present invention is configured as described above, when the propulsion tube deviates from the designed alignment, the inner tube is rotated and the engaging portion disposed at the tip of the inner tube is rotated. Among the plurality of movable plates disposed on the tube, the movable plate is positioned on the same line as the movable plate located at the part corresponding to the required correction direction, and then the inner tube is slid and the engaging portion is aligned with the movable plate. By engaging with the movable plate, the movable plate is rotated to change its direction, and the propulsion tube is propelled in this state, thereby correcting the direction of the propulsion tube.

In this way, the present invention not only ensures straight-line propulsion during normal propulsion with a simple configuration, but also makes it possible to easily correct the direction of the propulsion tube in a timely manner, which conventionally required constant monitoring and correction during the propulsion process. This simplifies the propulsion management and improves propulsion efficiency.

The present invention will be described below with reference to the illustrated embodiments.

1 is a propulsion tube propelled by a propulsion jack 5 interposed between a propulsion frame 2 connected to its rear end and a reaction wall 4 in a pit 3; 6 is a propulsion tube 1;
A cutter blade 7 is arranged concentrically inside the cutter blade 7.
an inner tube rotating motor 9 mounted on an inner tube attachment 8 attached to the propulsion frame 2; and a movable plate operation jack 10 interposed between the attachment 8 and the propulsion frame 2. It is designed so that it can be rotated and slid by.

Note that 11 in the figure is the propulsion base.

Movable plates 13a, 13b, 13c, and 13d are rotatably supported via pins 14 on brackets 12 that protrude from the tube 1 vertically and horizontally on the circumference of the tip end of the propulsion tube 1. ing. The movable plate is made up of a blade-like main body 13A and a mounting piece 13B protruding inward from the rear end of the main body.
B is pivotally attached to the bracket 12, and the outer circumferential surface of the main body 13A and the outer circumferential surface of the propulsion tube 11 are normally located on the same plane.

On the other hand, a fork 15 protruding from the outer circumferential surface of the distal end of the inner tube 6 constitutes an engaging portion that engages and disengages from the mounting leg piece 13B of the movable plate.

Since the illustrated embodiment is constructed as described above, the movable plates 13a, 13b, 13c, and 13d attached to the circumference of the cutting edge portion of the propulsion tube 11 are movable blade-shaped plates while propelling the ground. Due to the tip shape effect and the small gap c between the joint between the propulsion tube 1 and the movable plate, the movable plate 1 as a whole has straight movement.

Furthermore, if the straight tube 1 deviates from the designed alignment, the direction of the deviation is detected by a transit or the like, and the inner tube 6 is rotated to align the hawk 15 with the required movable plate position, as shown in FIG. The movable plate is moved in the direction of the arrow, the direction of the movable plate is changed by the hawk 15, and the direction is corrected by propelling the propulsion tube 1 in this state.

In this way, according to the illustrated embodiment, in the propulsion method for small diameter pipes, straightness during normal propulsion is ensured, and timely direction corrections can be easily made, which would normally be required during the propulsion process. This will simplify the propulsion management, which previously required monitoring and modification, and improve propulsion efficiency.

[Brief explanation of the drawing]

1 and 2 are side views showing the operating state of a conventional propulsion tube, FIG. 3 is a vertical side view showing an embodiment of the propulsion tube direction correction device according to the present invention, and FIG.
The figure is an enlarged vertical sectional side view of the main part, and Figures 5 and 6 are respectively the arrow-view and arrow-view of Figure 4.
FIG. 7 is a longitudinal side view showing the direction correction state. 1...Propulsion tube, 6...Inner tube, 7...Cut blade, 13a, 13b, 13c, 13d...Movable plate, 15...Hawk.

Claims (1)

[Scope of utility model registration request] A propulsion tube, an inner tube having a screw blade rotatably and slidably disposed in the propulsion tube, a plurality of movable plates rotatably mounted on the tip of the propulsion tube, A propulsion tube direction correction device characterized by comprising an engaging portion disposed at the tip portion and selectively engaging and disengaging from one of the movable plates.