JPH0423077B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a lubricant injection device used in a propulsion method for excavating the ground in order to form an underground tunnel or shaft.

(Prior Art) The conventional propulsion method is a method in which the propulsion pipes are pushed into the ground one by one toward the destination shaft using a propulsion jack using a reaction force from a reaction concrete wall installed in the starting shaft. Therefore, the peripheral surface frictional resistance between the outer surface of the propulsion tube and the ground has a very large effect on the total thrust. The conventional method for reducing this frictional resistance is to inject lubricant only from the lubricant inlet of the propulsion tube, and the lubricant inlet is generally
Only one was provided on the top and bottom of the propulsion tube.

(Problem to be solved by the invention) Recently, with the development of excavators and surveying systems, shield construction methods have been made longer and curved. In order to promote this, it is necessary to reduce the circumferential frictional resistance between the outer surface of the propulsion tube and the ground.

However, the conventional propulsion tube lubricant injection device
As mentioned above, since there was only a lubricant inlet provided in the propulsion tube, the lubricant was often not sufficiently evenly injected onto the circumferential surface of the propulsion tube. In addition, a large amount of the injected slipping material flows toward the tip of the pipe along the gap between the outer periphery of the propulsion pipe and the ground surface, and as a result, in the case of an open-tip propulsion machine, the slipping material flows from the face into the pipe. There was a problem in that the necessary amount of lubricant could not be sufficiently injected into the outer periphery of the succeeding propulsion tube because of the flow.

(Means for Solving the Problems) In order to solve the above-mentioned problems, in the present invention, a propulsion tube and A wheel having the same outer shape is inserted, and a lubricant injection port is provided almost uniformly over the entire outer circumference of the logical body, and a flanged seal ring made of an elastic material is provided on the propulsion direction side of the lubricant injection port. This constitutes a lubricant injection device for the propulsion method.

(Function) As described above, in the present invention, a ring body having the same outer shape as the propulsion pipe is inserted at any position such as the tip or middle part of the propulsion pipe containing the excavator used in the propulsion method, Since the lubricant inlet is provided almost uniformly over the entire outer circumference of this wheel, the lubricant is spread over the entire outer circumference of the propulsion tube. Therefore, the circumferential frictional resistance between the outer surface of the propulsion pipe and the ground is reduced, and as a result, it is possible to promote the propulsion method over a longer distance and into a curved line.

Further, since a flanged seal ring made of an elastic material is provided on the side in the propulsion direction from the lubricant inlet of the wheel body, this brim-shaped seal ring prevents the lubricant from leaking from the tip of the propulsion tube. be able to. Therefore, according to the present invention, sufficient lubricating material can be supplied to the outer periphery of the subsequent propulsion pipe.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. Figure 1 shows an example in which the lubricant injection device of the present invention is installed in the case of the semi-shield propulsion method, and Figure 2 shows an example in which the lubricant injection device of the present invention is installed in the case of the blade propulsion method. This is an example.

In the figure, 1 is an excavator, 2 is a subsequent propulsion pipe, 3 is a ring-shaped lubricant injection device of the present invention interposed between the excavator 1 and the propulsion pipe 2, and 4 in Fig. 2 is a lubricant injection device of the present invention. This is a cutting edge in place of the excavator 1, with arrow A indicating the direction of propulsion, and arrow B indicating the direction of lubricant injection.

The lubricant injection device 3 of the present invention is shown in FIGS. 3 and 4.
As shown in the figure, a wheel 5 having the same outer shape as the propulsion tube 2
The lubricant injection ports 6 are provided almost uniformly over the entire outer periphery. That is, in the case of FIG. 3, the injection ports 6 are provided at eight equal positions on the circumference.

Further, 7 is a brim-shaped seal ring made of an elastic material such as rubber provided in two rows on the wheel 5 on the upstream side of the lubricant injection port 6, and 8 is a bolt for fixing this seal ring 7. . Note that 9 (see FIG. 4) is a ground surface, and the brim-shaped seal ring 7 seals between this ground surface 9 and the wheel body 5.

5 and 6 show another embodiment of the lubricant injection device 3, in which a slit 10 is provided on the outer circumference of the ring body 5 over the entire circumference, and this slit 10
Inlet ports 11 communicating with the ring body 5 are provided at eight equal circumference positions on the inner circumferential portion of the ring body 5.

Then, as shown in FIGS. 1 and 2, the lubricant injection device 3 configured as described above is placed at an arbitrary position such as the tip or middle of the propulsion pipe 2 containing the excavator 1 used in the propulsion method. intervene.

(Effects of the Invention) As described above, in the present invention, a wheel having the same outer shape as the propulsion tube 2 is placed at any position such as the tip or middle of the propulsion tube 2 including the excavator 1 used in the propulsion method. 5 is inserted, and the lubricant injection ports 6, 10, 11 are inserted almost uniformly over the entire outer circumference of the ring body 5.
Since this is provided, the lubricating material can be spread over the entire outer periphery of the propulsion tube 2. For this reason, the peripheral surface frictional resistance between the outer surface of the propulsion pipe 2 and the ground is reduced, and as a result, it is possible to achieve the effect that the propulsion method can be extended over a long distance and can be made curved.

In addition, the lubricant injection ports 6, 10, 11 of the ring body 5
The brim-shaped seal ring 7 made of an elastic material provided on the more upstream side can prevent the lubricant from leaking from the tip of the propulsion tube. Therefore, according to the present invention, it is possible to obtain the effect that sufficient lubricating material can be supplied to the outer periphery of the subsequent propulsion pipe.

[Brief explanation of drawings]

Figures 1 and 2 are side views of the propulsion pipe in the propulsion method using the lubricant injection device of the present invention;
The figure is a cross-sectional front view of the lubricant injection device, FIG. 4 is a sectional view taken at - in FIG. 3, FIG. 5 is a sectional view showing another embodiment, and FIG. It is a diagram. 1... Excavation machine, 2... Propulsion pipe, 3... Slub material injection device,
4...Blade mouth, 5...Ring body, 6...Sliding material injection port, 7...Flame-shaped seal ring, 8...Bolt, 9...Mound surface, 10...
Slit, 11...Inlet.

Claims (1)

[Claims] 1. A wheel with the same outer shape as the propulsion tube is inserted at any position such as the tip or middle of the propulsion tube containing the excavator used in the propulsion method, and the ring is almost uniformly distributed over the entire outer circumference of the tube. A lubricant injection device for a propulsion method, characterized in that a lubricant injection port is provided, and a brim-shaped seal ring made of an elastic material is provided on the side of the lubricant injection port in the propulsion direction.