JPH03110296A - Excavation work and double-tube type preceding pipe therefor - Google Patents

Abstract

PURPOSE:To reduce the cost of construction by greatly reducing the number of arrival vertical pits by a method in which inner and outer tubes set slidably through a roller are provided on the rear of a shield machine and pressed alternately into the ground. CONSTITUTION:An inner tube 3 is provided in an outer 1 and rollers 5 are set axially on three places between the tubes 1 and 3 to make up a double-tube type ppeceding pipe. A shield machine 9 is carried in a starting vertical pit 11 formed in the ground 8 for lateral excavation, and at the time the preceding pipe is pushed in from the rear of the machine 9 by a jack 13 supported on the bearing wall 15. When the excavating limit distance of the tube 1 is reached, tube 3 is carried in from the pit 11 and pushed into the ground by the jack 13. A gelled lubricant 17 is then injected through an injection hole 7 and the tube 1 is pressed in. These operations are repeated. The excavating distance can thus be greatly extended.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a propulsion method and a double pipe type leading pipe used therein.

[Conventional technology]

Conventionally, small-diameter propulsion work was carried out using the procedure shown in Figure 7.

First, as shown in FIG. 7(a), a shield machine 103 is carried in from the starting shaft 101 formed in the other mountain 102 that is the target of excavation, and a hole 105 is excavated laterally by this shield machine 103. I will do it.

At the same time, a pipe (for example, a hump pipe) 107 is connected to the rear of the shield machine 103 and connected to the starting shaft 101.
is pushed in by a jack 109 supported via a bearing wall 113.

As shown in FIG. 7(b) below, the pipes 107 are sequentially connected,
and push it in.

Then, as shown in FIG. 7(c), when the pipe 107 at the tip reaches the reaching shaft 111, the shield machine 103
Collect it and end the promotion.

[Problem to be solved by the invention] The conventional configuration described above has the following problems.

The propulsion distance in the propulsion method is the tip part (shield machine 10
It is determined by the relationship between the total propulsion resistance of the resistance 5) and the peripheral surface friction resistance of the tube 107, and the propulsion force of the jack 109.

That is, it is possible to propel the vehicle up to a distance where the propulsive force of the jack 109 and the total propulsion resistance are equal.

And, before the distance that can be propelled, there is a reaching shaft 111.
will be established.

However, in the conventional case, since the propulsion distance was short, a large number of reaching shafts 111 had to be provided, which led to an increase in construction costs.

The present invention was made based on these points, and its purpose is to extend the propulsion distance, reduce the number of required reaching shafts, and reduce the cost required for construction. The purpose of this invention is to provide a propulsion method and a double-pipe lead pipe for use in the method.

[Means for Solving the Problems] In order to achieve the above object, the propulsion method according to the present invention uses a double-pipe tip, in which an inner pipe is placed behind an outer pipe via rollers while excavating with a shield machine. There is an initial process in which the conduits are pushed in one after another, an inner tube propulsion process in which the inner tube located at the tip is propelled by pushing one inner tube from behind when the outer tube has reached its propulsion limit distance, and 1 (solid). This method is characterized by sequentially repeating an outer tube propulsion step in which the outer tube located at the tip is propelled by pushing the outer tube from behind, and then the inner tube propulsion step and outer tube propulsion step described above.

In this case, it is desirable that during the inner tube propulsion process, a gap generated due to a one-piece difference between the inner tube and the outer tube be filled by injecting a lubricant.

Further, the double pipe type leading pipe according to the present invention is characterized by comprising an outer pipe and an inner pipe slidably disposed within the outer pipe via an arbitrary number of rollers. .

At that time, it is desirable to form lubricant injection holes in the outer tube and the inner tube.

[For production]

First, a shield machine excavates the excavation, and a double-pipe lead pipe is pushed in from behind.

Next, when the outer tube of the double-pipe type leading tube reaches its propulsion limit distance, one inner tube is pushed in from behind to propel the shield machine located at the tip and the inner tube.

Next, one outer tube is pushed in from behind to propel the outer tube located at the tip. When promoting this outer tube,
Since the front of the outer pipe has already been excavated by the shield machine, no resistance will be exerted.

After that, the desired propulsion is achieved by alternately carrying out the propulsion of the inner tube and the outer tube.

When a lubricant is injected during inner tube propulsion, the difference in level between the inner tube, shield machine, and outer tube is filled with the lubricant, and the lubricant acts as a lubricant during subsequent outer tube propulsion. .

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

First, the structure of the double pipe type leading pipe according to this embodiment will be explained with reference to FIG. First, there is an outer tube 1, and an inner tube 3 is disposed at an interval on the inner circumference side of the outer tube 1.

Between the outer tube 1 and the inner tube 3, three rollers 5 as rotating bodies are arranged at equal intervals in the circumferential direction over three locations in the axial direction. Therefore, via these rollers 5,
The outer tube 1 and the inner tube 3 are configured to be slidable relative to each other.

Further, a lubricant injection hole 7 is formed in the outer tube 1 and the inner tube 3.

Next, a propulsion method using the above-mentioned double pipe type leading pipe will be explained. First, as shown in FIGS. 2(a) to 2(c), the shield machine 9 is moved into the starting shaft 1 formed in the ground 8.
The material is brought in from 1 and excavated horizontally. At the same time, the double pipe type leading pipe is supported by the jack 1 supported by the bearing pressure wall 15.
3, the shield machine 9 is pushed in from behind.

The pipes are connected to each other by a collar (not shown), and a water stop ring (not shown) is installed between the outer pipe 1 and the inner pipe 3 of the double-pipe type leading pipe located at the tip to prevent underground water, Prevent the infiltration of earth and sand.

As the double-pipe leading pipes are pushed in one after another, the propulsion limit distance of the outer pipe 1 is reached.

Therefore, as shown in FIGS. 3(a) to 3(c), one inner pipe 3 is carried in from the starting shaft 11 and pushed in with a jack 13. As a result, the shield device 9 located at the tip and the inner tube 3 of the double-pipe type leading tube are pushed in. The inner tube 3 slides smoothly inside the outer tube 1 via the rollers 5.

At this time, since the shield machine 9 and the inner tube 3 have different diameters, a difference in level occurs. Therefore, as shown in FIG. 3(c), a gel-like lubricant 17 is injected through the lubricant injection hole 7 to fill the difference in level.

Next, as shown in FIG. 4(a) to FIG. 4(C),
The outer tube 1 is carried in from the starting shaft 11 and pushed in with a jack 13. When the outer tube 3 is pushed in, almost no resistance acts on the outer tube 3 located at the tip.

This is because the excavation has already been done by the shield machine 9, and at the same time, the gel-like lubricant 17 wraps around between the outer pipe 1 and the ground 8, functions as a lubricant, and resists the friction between the two. This is because it significantly reduces the

After the outer tube 1 is pushed in, the inner tube 3 is pushed in, and then the outer tube 1 is pushed in. Thereafter, this pushing of the inner tube 3 and the pushing of the outer tube 1 are repeated in sequence.

Note that a clean water ring (not shown) is also installed between the final inner tube 3 and outer tube 1.

Then, as shown in FIGS. 5(a) to 5(c), the shield machine 9 reaches the reaching shaft 21.

Therefore, the shield machine 9 is carried out from the reaching shaft 21.

Next, as shown in FIGS. 6(a) to 6(C),
The inner tube 3 is pulled out into the reaching shaft 21 by the winch 23 and carried out.

According to this embodiment, the following effects can be achieved.

First, since the propulsion limit distance is significantly extended, the number of reaching vertical shafts 21 is also significantly reduced, thereby reducing the cost required for construction.

This is because a construction method was adopted in which the inner tube 3 and outer tube 1 were pushed in alternately using a double-pipe lead tube.

That is, when the inner tube 3 is pushed in, the inner tube 3 smoothly slides on the inner peripheral side of the outer tube 1 via the rollers 5, so that the only resistance acting on the shielding device 9 is the resistance.

Further, when pushing the outer tube 1, since it has already been excavated by the shield machine 9 and the gel-like lubricant 17 acts as a lubricant, almost no resistance acts on the outer tube 1 located at the tip.

Incidentally, the propulsion distance is approximately twice that of the conventional one.

Note that the present invention is not limited to the above embodiment.

For example, the rotating body may be something other than a roller, such as a ball (and its position, number, etc.)
It is not limited to what is illustrated.

〔Effect of the invention〕

As detailed above, according to the propulsion method according to the present invention and the double pipe type leading pipe used therein, the propulsion distance can be extended, so the number of required reaching shafts is also reduced.
Therefore, the cost required for construction can be reduced.

[Brief explanation of drawings]

1 to 6 are views showing one embodiment of the present invention, in which FIG. 1(a) is a side sectional view of a double-pipe type leading pipe, and FIG. 1(b) is a side sectional view of a double-pipe type leading pipe.
1(a) is a sectional view taken along the line bb in FIG. 3N(c) is a sectional view showing the pushing operation of the inner tube, FIGS. 4(a) to 4(c) are sectional views showing the pushing operation of the outer tube, and FIGS. c) is a sectional view showing the unloading work of the shield machine, FIGS. 6(a) to 6(c) are sectional views showing the pulling out work of the inner tube, and FIGS. 7(a) to 7(c) 1 is a sectional view showing a conventional propulsion method. 1 outer tube 3 inner tube 7/! Material injection hole 13 Jacket 21 Arrival shaft 50-ra (rotating body) 9 Shield machine 11 Starting shaft 17 Gel-like lubricant Fig. 1 Fig. 2 Fig. 3 Fig. 17...Del; Figure 21...tJiLi pit Figure 6

Claims (1)

[Claims] 1. An initial step in which a double-pipe lead pipe consisting of an outer pipe and an inner pipe that are mutually slidable is pushed into the back of the shield machine while excavating, and the outer pipe is propelled. an inner tube propulsion step in which the inner tube located at the tip is propelled by pushing one inner tube from behind when the limit distance is reached;
The outer tube propulsion step in which the outer tube located at the tip is propelled by pushing one outer tube from behind, and the inner tube propulsion step and the outer tube propulsion step described above are sequentially repeated to achieve propulsion over a desired distance. Characteristic propulsion method. 2. The propulsion method according to claim 1, characterized in that during the inner tube propulsion step, a gap generated due to the difference in diameter between the inner tube and the outer tube is filled by injecting a lubricant. Construction method. 3. A double-pipe type leading pipe comprising an outer pipe and an inner pipe slidably disposed within the outer pipe via an arbitrary number of rotating bodies. 4. The double-pipe type leading pipe according to claim 3, wherein a lubricant injection hole is formed in the outer pipe and the inner pipe.