JPS6117098Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a leading pipe in a management construction machine that buries a pipe body using a leading pipe laid underground in advance as a guide.

Conventionally, in a management construction machine that lays a lead pipe in advance in the course of the pipe to be buried and uses this lead pipe as a guide to propel the pipes sequentially while burying the pipe, in order to accurately lay the lead pipe in the pre-planned course, A stabilizer is provided on the outer periphery of the leading tube to give directionality. This stabilizer is propelled underground along with the propulsion of the lead pipe, but during propulsion, it moves the earth and sand at the boundary with the ground, weakening the strength and adhesion of the ground and reducing frictional resistance with the ground. do. This makes it possible to propel the lead pipe with less propulsion force, but if the lead pipe is stopped for more than a day due to work reasons, the once weakened ground may be damaged due to xotropic development of earth and sand, especially clay. At the same time as the strength was restored, the stabilizer was pressed again by the ground due to the restoring force of the ground, which caused a problem in that the next time the lead pipe was to be propelled, a greater propulsion force was required than before the suspension.

This invention was made for the purpose of improving such a problem, and provides a leading pipe for management equipment in which a swell having a protrusion in the stabilizer part is attached along the outer periphery on the leading end side of the leading pipe having a stabilizer. , which attempts to reduce the propulsion resistance of a leading pipe with a stabilizer.

This invention will be described in detail below with reference to an illustrated embodiment. FIG. 1 shows a series of leading pipes being propelled underground, with a pilot head at the tip that controls the direction of propulsion, and each leading pipe main body 2 bent along the direction of propulsion of the pilot head 1. A plurality of leading pipes are provided, each of which is elastically connected, and a leading pipe main body 3 having a stabilizer 3a protruding from the outer circumferential surface along the axial direction is connected to the rear thereof, and has the stabilizer 3a. Lead pipe body 3
An annular swell 4 shown in FIG. 2 is fixed along the outer circumferential surface of the tip of the swell 4 shown in FIG. Swell 4 above
is made of a wear-resistant metal plate or the like, and a protrusion 4a having a slightly larger outer dimension than the stabilizer 3a is provided on the outer periphery where each stabilizer 3a is located. Along with propulsion, a groove is formed behind the swell 4 so that the stabilizer 3a can be propelled without resistance.

On the other hand, behind the swell 4, lubricant jet ports 3b are opened at the upper and diagonal lower portions of the outer peripheral surface of the leading tube main body 3, as shown in FIGS. 3 and 4.
Note that FIG. 4 is a sectional view of the vicinity of the jet port 3b shown in FIG. 3. These spout ports 3b are connected to a lubricant supply source (not shown) through pipes 5 installed in the leading pipe main body 3, and are located behind the swell 4 as the leading pipe main body 3 is propelled. The lubricant can be injected into the gap between the outer peripheral surface of the leading pipe main body 3 and the stabilizer 3a and the inner surface of the propulsion shaft, which are formed as shown.

As described above, this invention is based on the idea of providing a stabilizer 3a on the outer circumferential surface of the leading pipe body 3 at the tip thereof.
Since an annular swell 4 having a protrusion 4a is provided along the outer peripheral surface of the stabilizer 3a, when the leading pipe body 3 is propelled, a thrust shaft is formed behind the swell 4 through which the leading pipe body 3 and the stabilizer 3a can pass without any low shaft, thereby reducing the thrust resistance caused by the stabilizer 3a.

In addition, if propulsion is suspended for more than one day due to work reasons, even if the strength of the ground is restored by the rock development and the restoring force of the ground is generated, there will be a swell 4 between the ground and the stabilizer 3a. As shown in the figure, since the voids are formed in advance, the stabilizer 3a is unlikely to be strongly pressed by the earth pressure that has restored the strength of the ground.

As a result, the propulsion force for the next propulsion only needs to overcome the frictional resistance of Swell 4 and the ground, so even after the propulsion stops, the propulsion force exceeds the propulsion force before the propulsion pause like before. It becomes possible to significantly reduce the propulsion force without the need for swell 4
Since the lubricant is spouted from behind, the lubricant can be spread over the entire outer circumferential surface of the leading pipe main body 3 and the stabilizer 3a, thereby further reducing frictional resistance with the ground. You will also be able to do things.

Moreover, since the mounting position of the swell 4 can be easily moved to any desired location, and the swell can be easily manufactured by molding a plate material, it is possible to provide the swell at a rock-bottom price.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention, and FIG. 1 is an overall explanatory view, FIG. 2 is a perspective view of a leading pipe having a stabilizer and a swell, FIG. 3 is an enlarged side view of the same, and FIG. 4 is an enlarged side view of the same. The cross-sectional view, FIG. 5, is a cross-sectional view during propulsion. 1 is a pilot head, 2 and 3 are leading tube bodies, 3a is a stabilizer, 4 is a swell, and 4a is a protrusion.

Claims (1)

[Scope of utility model registration request] The front end of a flexible leading pipe 2 is connected to the rear end of the pilot head 1 that is propelled into the ground, and the front end of a leading pipe body 3 having stabilizers 3a on both sides of the outer peripheral surface is connected to the rear end of the leading pipe 2. In the connected one, the front end of the leading tube body 3 has a protruding portion 4a that has a slightly larger diameter than the outer circumferential surface of the leading tube body 3 and protrudes outward from the outer circumferential surface of the stabilizer 3a on both sides. A leading pipe for management equipment, in which a swell 4 is provided and a lubricant spout 3b is opened on the outer periphery of the leading pipe main body 3 behind the swell 4.