JP2000008768A - Long-distance propulsion excavator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce frictional resistance working on a propulsion pipe by forming a tunnel hole formed of viscous material, on the outer periphery of the propulsion pipe by an excavator at the tip to ensure a uniform void between the tunnel hole and the outer periphery of the propulsion pipe, and filling a lubricant in the void. SOLUTION: An excavator 1 is composed of excavating mechanism 2 equipped at the tip of an outer cylinder 4 of the excavator; a wide ring 3 fixedly provided at the front outer periphery of the outer cylinder 4; a primary injection hole provided at the rear end face of the wide ring 3, with a specified circumferential space; and an outer periphery of the outer cylinder 4. Simultaneously with the excavation of this excavator 1, viscous material 7 is filled from the primary injection hole to the outer periphery of the excavator 1, and the viscous material 7 is enlarged in diameter to form a self-supported tunnel hole 11 at the outer periphery of a propulsion pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a propulsion method, in which a tunneling hole is formed in the outer periphery of a propulsion pipe by a tip excavator, and a lubricating layer is formed in a gap between the tunnel hole and the outer circumference of the propulsion pipe. Reduce the frictional resistance acting on the propulsion pipe,
The present invention relates to an excavator that enables efficient long-distance propulsion construction.

[0002]

2. Description of the Related Art In recent years, there has been a tendency for long-distance / curve propulsion construction, in which a vertical shaft is not constructed as much as possible, to be planned due to problems of road conditions and construction pollution. The propulsion method is a method of burying a propulsion pipe in the ground by pressurizing the end face of the propulsion pipe with a main push jack from the rear while excavating the ground with an excavation mechanism of an excavator equipped at the tip. For this reason, as the propulsion extension increases, the frictional resistance between the propulsion pipe and the ground also increases in proportion, and finally becomes larger than the allowable axial force of the propulsion pipe, making propulsion construction impossible. . For this reason, a middle push device equipped with a middle push jack is provided at the joint part in the middle of the propulsion pipe to disperse the propulsive force concentrated at the rear end of the propulsion pipe, or from the lubrication injection hole provided in the propulsion pipe Inject various lubricants,
Generally, a method of reducing the propulsive force applied to the propulsion pipe by changing the frictional resistance between the propulsion pipe and the sliding material is widely used.

[0003]

According to the above-mentioned method using the intermediate pushing device, a plurality of the intermediate pushing devices are provided so that the propulsive force concentrated on the rear end face of the propulsion tube is within the allowable axial force of the propulsion tube. It has only to be placed at a location, and long-distance propulsion construction has become possible. However, the middle push device must repeat the operation from the front device to the rear device one by one,
When the number of places where the middle pusher is installed becomes more than one, the propulsion operation becomes complicated, and the propulsion speed decreases. In addition, in the method of injecting the lubricating material from the lubricating material injection hole provided in the propulsion pipe, in the ground where the tunnel hole formed by the excavator is held, the lubricating material injected from the propulsion pipe is spread around the propelling pipe. Since the filling is performed evenly, the propulsive force can be efficiently reduced. However, in the case of propulsion construction, which is often used in soils without independence, the tunnel hole formed by the excavator collapses instantaneously or is compacted, eliminating the gap between the ground and the propulsion pipe. Even if the lubrication material is injected from the injection hole, there is no space for filling the lubrication material.Therefore, the lubrication material cannot be evenly filled around the propulsion pipe because it is partially injected or escapes to the weak part of the ground. Propulsion gradually increases in proportion to the propulsion extension,
This will make the propulsion construction difficult or cause damage to the propulsion pipe.

[0004] Therefore, in the present invention, a tunnel hole made of a viscous material is formed by a tip excavator in the propulsion work, and a sliding material is injected between the tunnel hole and the outer periphery of the propulsion pipe to cause friction between the excavator and the outer circumference of the propulsion pipe. To provide an excavator capable of efficiently performing long-distance propulsion construction with significantly reduced resistance.

[0005]

That is, the present invention provides a digging mechanism mounted on the tip of an excavator barrel, a widening ring fixedly mounted on the outer periphery in front of the excavator barrel, and a circular end on the rear end face of the widening ring. A primary injection hole provided at a predetermined interval in the circumferential direction, and a diameter increasing ring provided behind the outer cylinder of the excavator, and a viscous substance is injected around the excavator along with the excavation of the excavator. This is a long-distance propulsion excavator that forms a tunnel hole on the outer circumference of a propulsion pipe by expanding the diameter of a viscous material.

As the excavating mechanism of the excavator, a conventionally used excavating mechanism is used. The excavating mechanism is used by changing an opening ratio of a sediment intake port or the like according to soil conditions. The width of the widened ring attached to the outer periphery in front of the excavator outer cylinder is fixed so as to be slightly larger than the outer periphery of the propulsion pipe depending on the soil condition and the pipe diameter. As the shape of the widening ring, one having a rectangular cross section is generally used. The first injection hole provided in the rear end surface of the widening ring is connected from the outer cylinder to a pipe member installed in the excavator.

[0007] An expanding ring provided at the rear of the excavator outer cylinder is provided so as to be larger than the excavator outer cylinder diameter in order to consolidate and expand the viscous material injected from the first injection hole to the outer peripheral ground. Have been. It is effective to change the size of the diameter-expanding ring depending on the diameter of the propulsion pipe and the soil quality, and to form a tapered shape that gradually expands from the front so that consolidation can be performed smoothly.

As the viscous material injected from the first injection hole, a high-viscosity clay material, a resin material, or the like is used.

With the above arrangement, when the excavator is advanced while excavating the ground by the excavating mechanism at the tip, the ground is widened to the diameter of the widening ring by the widening ring fixed in front of the outer cylinder of the excavator. Form a tunnel hole larger than the outer cylinder. In the formed tunnel hole and the gap between the excavator outer cylinder,
A viscous substance is injected and filled from the first injection hole to maintain a gap. Then, as the excavator advances, the viscous material passes through the diameter-enlarging ring at the rear of the excavator outer cylinder and is compacted on the outer peripheral ground to form a self-supporting tunnel hole. After passing through the excavator, ordinary lubricating material is evenly injected into the gap between the tunnel hole and the propulsion pipe which is securely held, so that the propulsion work can be performed with a small propulsion force.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view illustrating a long-distance propulsion machine according to the present invention. At the tip of the excavator 1, an excavating mechanism 2 for excavating the ground is provided. As a structure of the generally used excavating mechanism 2, a configuration is used in which a disk-shaped face plate provided with a cutting blade is rotated on the entire surface to perform excavation, and excavated soil is taken in from intake ports provided at a plurality of locations.
It is also possible to use a spoke type excavation mechanism depending on soil conditions and the like. On the outer cylinder 4 in front of the excavator 1, a widened ring 3 having a predetermined thickness and a rectangular section is fixed all around. On the rear end surface of the widening ring 3, first injection holes 5 are provided at predetermined intervals in a circumferential direction, and are connected to a pipe member 6 in the excavator 1. Outer cylinder 4 behind excavator 1
Is provided with a diameter-enlarging ring 8 whose diameter is gradually increased from the front. The size of the widening and the widening is determined according to soil conditions and the diameter of the propulsion pipe 9. A propulsion pipe 9 is fitted behind the excavator 1. The propulsion pipe 9 is provided with a second injection hole 10 penetrating a wall at a predetermined position.

FIG. 2 is a sectional view taken along the line AA in FIG. In front of the outer cylinder 4 of the excavator 1, a widening ring 3 is fixedly provided around the entire circumference. On the rear end surface of the widening ring 3, four first injection holes 5 are provided at equal intervals in the circumferential direction. The first injection hole 5 passes through the outer cylinder 4 of the excavator 1 and is connected to a pipe 6 in the excavator 1. Although not shown, a check valve is provided in the first injection hole 5 so as to prevent backflow of groundwater or injected viscous material from the outside. In the present embodiment, the first injection hole 5 is provided at four locations, but can be increased or decreased according to the diameter of the propulsion pipe 9.

FIG. 3 is a sectional view for explaining the state of the propulsion pipe. The excavator 1 forms a viscous material tunnel hole 11 made of viscous material in the ground around the propulsion pipe 9.
An even gap is formed between the viscous material tunnel hole 11 and the propulsion pipe 9, and the outer periphery of the propulsion pipe 9 is evenly filled with the lubricating material 12 injected from the second injection hole 10 of the propulsion pipe 9. The lubricating material 12 may be a commonly used liquid lubricating material, and the point is that the lubricating material is uniformly filled around the propulsion pipe 9.

Next, a description will be given of the state of propulsion construction using the long-distance propulsion machine according to the present invention. Excavation mechanism 2 of excavator 1
And the excavator 1 is advanced while excavating the ground at the tip. As the excavator 1 advances, the viscous material 7 is injected from the rear end face of the widening ring 3 from the first injection hole 5 to fill and hold the gap between the tunnel hole formed by the widening ring 3 and the outer cylinder 4. Further, as the excavator 1 advances, the viscous material 7
Is compacted by an expanding ring 8 provided at the rear of the excavator 1 and closely adhered to the outer peripheral ground, and a self-standing viscous material tunnel hole 11 is formed.
To form In the gap between the viscous material tunnel hole 11 and the propulsion pipe 9 securely held by the excavator 1, the lubricating material 12 is uniformly injected through the second injection hole 10 provided in the propulsion pipe 9. By the above-described excavator 1, the outer periphery of the propulsion pipe 9 is held in the viscous material tunnel hole 11 and is filled with the uniform lubricating material 12, so that only a small frictional resistance between the propulsion pipe 9 and the lubricating material 12 is obtained, and the long distance Can be constructed with a small propulsion force.

[0014]

As described above, the excavator for long-distance propulsion according to the present invention can maintain a self-standing tunnel hole on the outer periphery of the propulsion pipe and reliably fill the gap with the lubricant smoothly. The frictional resistance on the outer periphery of the propulsion pipe, which has been the main force, can be significantly reduced. As a result, even in long-distance propulsion construction, a large propulsion force does not act on the propulsion pipe as in the past, eliminating the need for damage to the pipe end face and complicated middle pressing operation, etc., shortening the construction period and reducing the construction cost Was made possible.

[0015]

[Brief description of the drawings]

FIG. 1 is a side view illustrating a long-distance propulsion machine according to the present invention.

FIG. 2 is a cross-sectional view taken along the line AA in FIG.

FIG. 3 is a cross-sectional view illustrating a state of a propulsion pipe.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 excavator 2 excavating mechanism 3 widening ring 4 outer cylinder 5 first injection hole 6 pipe 7 viscous material 8 large diameter ring 9 propulsion pipe 10 second injection hole 11 viscous material tunnel hole 12 lubricating material

Claims (1)

[Claims] An excavator for excavating a propulsion tube over a long distance by equipping a tip with an excavation mechanism. A fixed widening ring, a primary injection hole provided at a rear end surface of the widening ring at a predetermined interval in a circumferential direction, and a widening ring provided behind the outer cylinder of the excavator; A long-distance excavator characterized in that a tunnel hole is formed in an outer periphery of a propulsion pipe by injecting and filling a viscous substance from a first injection hole into an outer periphery of the excavator as the excavator excavates and expanding the viscous substance.