JP2002180783A - Propelling pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a propelling pipe which is for use in a pipe jacking method for laying embedded pipes in the ground, and can reduce a propelling force functioning as surface friction generated between an external surface of the propelling pipe and aggregate or water. SOLUTION: The propelling pipe is for use in the pipe jacking method which is carried out by providing a pipe having a driving machine or a cutting edge attached to the tip of the pipe, and pressing the pipe into the ground by using a jack propelling force, to thereby bury conduits in the ground. According to the propelling pipe, a plurality of grooves are formed in an external surface of the propelling pipe along a pipe shaft direction at circumferentially regular intervals.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propulsion method for laying a propulsion pipe or the like in the ground, in which a propulsion force, which is a surface friction generated between an outer surface of the propulsion pipe and a sliding material or water, can be significantly reduced. is there.

[0002]

2. Description of the Related Art The propulsion force of a propulsion method in which a propulsion pipe or the like is laid in the ground is constituted by the resistance of the excavator at the tip or the tip of a cutting edge and the frictional resistance between the outer periphery of the propulsion pipe and the surrounding ground. The tip resistance is a constant value unless there is a change in soil properties, etc., but the friction resistance is
The propulsion length increases, that is, increases with the number of propulsion pipes. For this reason, the propulsion force becomes very large when the distance is long, and when the load capacity of the propulsion pipe is exceeded, the propulsion pipe is damaged and the propulsion construction becomes impossible. Therefore, in long-distance propulsion construction, since the friction between the soil and the propulsion pipe material is relatively large, a liquid lubricant such as a polymer material or a viscous soil material is injected and filled between the outer circumference of the propulsion pipe and the surrounding ground, By changing the friction between the propulsion pipe and the soil into the friction between the propulsion pipe and the slipper,
A method for reducing propulsion is used.

[0003]

According to the above-described method for injecting a lubricating material, it is possible to carry out long-distance propulsion work with relatively low propulsion force. However, if the outer circumference of the propulsion pipe is smooth, friction between the outer surface of the propulsion pipe and the lubricating material or water and the effect of earth pressure will form a lubricating film between the outer surface of the propulsion pipe and the lubricating material. There is a problem that the coating generates a suction action against the advance of the propulsion tube, and increases the propulsive force applied to the propulsion tube. In particular, when restarting after the propulsion operation is stopped, the lubricating film becomes remarkable and the suction effect is large, and there is a problem that a propulsion force having a large surface friction several times as large as that of a normal operation is required.

For this reason, the present invention relates to a propulsion method,
An object of the present invention is to provide a propulsion pipe capable of remarkably reducing a propulsion force, which is a surface friction generated between an outer surface of the propulsion pipe and a sliding material or water.

[0005]

That is, the present invention is used in a propulsion method in which an excavator or a cutting edge is attached to the tip, and a pipe is buried underground by pressing a pipe underground by jack propulsion or the like. In the propulsion pipe, the propulsion pipe has a plurality of grooves arranged along the pipe axis direction on the outer surface of the propulsion pipe.

As the propulsion pipe, a concrete pipe, a steel pipe, a cast iron pipe, or the like which is usually used for propulsion work can be used. The interval between the grooves arranged in the tube axis direction on the outer surface of the propulsion pipe is not particularly limited, but it is preferable that the grooves are distributed substantially uniformly over the outer circumference of the propulsion pipe. Since the purpose of the size of the groove is to destroy a film formed on the tube surface, the groove is preferably shallow and narrow in width. As the arrangement of the grooves, narrow grooves continuous in the tube axis direction, parallel fine grooves separated and arranged, and parallel fine grooves arranged in a complicated manner are used.

[0007] The grooves provided on the outer surface of the propulsion pipe destroy the lubricating film of water and the lubricating material generated by the action of friction and earth pressure,
In addition, the coating can be removed through the groove, the suction action against the advance of the propulsion tube can be avoided, the surface friction on the outer surface of the propulsion tube can be suppressed, and the propulsion tube can be buried with a low propulsion force.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view illustrating a propulsion pipe according to the present invention. The propulsion pipe 1 is formed in a cylindrical shape with a predetermined wall thickness so as to withstand earth pressure and water pressure. A tubular collar 3 having a diameter substantially equal to the outer diameter of the main body of the propulsion tube 1 is fixedly provided at a joint portion at the tip of the propulsion tube 1. The joint at the rear end of the propulsion pipe 1 forms a paragraph 4 having an outer diameter slightly smaller than the inner diameter of the collar 3. Concrete materials, steel materials, vinyl chloride materials, etc. are used as the propulsion pipe material, and the pipe material is selected in consideration of the application and construction conditions. A plurality of grooves 2 linearly extending in the axial direction of the propulsion pipe 1 are arranged on the outer surface of the propulsion pipe 1 in the circumferential direction. The arrangement of the grooves 2 varies depending on the diameter of the propulsion pipe, soil conditions, and the like, but it is preferable that the grooves 2 are arranged uniformly over the circumference of the outer surface of the propulsion pipe 1. The size of the groove 2 is determined by the propulsion pipe 1
It is for destroying the lubricating film formed on the surface,
The width of the groove 2 may be small and shallow.

FIG. 2 is a cross-sectional view of the propulsion pipe of FIG.
On the outer peripheral surface of the propulsion pipe 1, a groove 2 having a V-shaped cross section is evenly provided in the circumferential direction. In the present embodiment, the cross section of the groove 2 is illustrated as a V-shape, but may be a U-shape or a rectangular cross-section.

FIG. 3 is a side view for explaining the arrangement of grooves according to another embodiment. A plurality of rows of narrow grooves 2 are mixed and arranged in parallel in the axial direction of the propulsion pipe.

A vertical groove 2 provided substantially uniformly in the pipe axis direction on the outer surface of the propulsion pipe 1 destroys a lubricating film formed between the surface of the propulsion pipe 1 and a lubricating material or water, and the Since the removal of the coating can be performed through the groove 2 in the pipe axis direction, the suction effect that would prevent the advancement of the propulsion pipe 1 during propulsion is avoided.

[0012]

As described above, according to the propulsion tube of the present invention,
A plurality of longitudinal grooves provided on the outer surface of the propulsion pipe in the pipe axis direction destroyed the lubricating film generated by the sliding material and water and removed it through the grooves in the pipe axis direction, which was a resistance when the propulsion pipe moved forward Surface friction is suppressed and propulsion burial can be performed with low propulsion. In particular, even when restarting after the suspension of the propulsion work, the lubricant film, which had become a large resistance, can be easily destroyed, so that the propulsion work can be performed quickly and the cost of the propulsion equipment can be reduced.

[0013]

[Brief description of the drawings]

FIG. 1 is a side view illustrating a propulsion pipe according to the present invention.

FIG. 2 is a cross-sectional view of the propulsion pipe of FIG.

FIG. 3 is a side view illustrating an arrangement of grooves according to another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Propulsion pipe 2 Groove 3 Cylindrical collar 4 Paragraph

Claims (1)

[Claims] Claims: 1. A propulsion pipe used in a propulsion method in which a tipping machine or a cutting edge is attached to a tip and a propulsion pipe is pressed into the ground by jack propulsion or the like and a row of pipes is buried in the ground. A plurality of grooves are arranged along a pipe axis direction of the propulsion pipe.