JP3465071B2 - Long prefabrication method for tunnel and its long prefabricated pile - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a long receiving method for a tunnel and a pile receiving the long receiving method.

[0002] The long receiving method for a tunnel referred to here is
In general, some 3 or 4 around the tunnel face.
This is a construction method in which two steel pipes are connected to form a long steel pipe, and the long steel pipe is used for so-called fore piling. It has
The case of filling the interior of the long steel pipe and the space between the steel pipe and the wall of the ground hole with the injection material may or may not be filled. The same applies to the following description and claims of the present invention.

The long receiving method for tunnel (hereinafter abbreviated as long receiving method) is a construction method developed in recent years, and more specifically, it suppresses the settlement of the ground, prevents loosening of the ground, and construction. In order to obtain safety, long steel pipes are provided around the outside of the face of the tunnel before excavation. The greatest feature of this construction method is that it can be easily installed by a drill jumbo that is commonly used for tunnel excavation without depending on special workers, and it is a high-quality so-called umbrella (long steel pipe, that is, a parallel pile of receiving piles). Is a type of support work).

[0004]

2. Description of the Related Art In the conventional long receiving method, element steel pipes for long piling fore piling are filled with flat pipe walls, and one end of these element steel pipes is threaded on the outer peripheral surface and the other end is cut. Has a shape in which the inner peripheral surface is threaded, and the threaded portion at the end of the tube is screwed to connect the element steel pipe.

For this reason, in the conventional method, since the strength is reduced by the above-mentioned thread cutting, the threaded portion is strongly prone to fatigue due to the impact or torque applied to the element steel pipe during construction. To obtain safety, it is necessary to make the parallel pitch of the long steel pipe forepiling relatively dense. This means that, in this type of construction method, the number of long steel pipes used in the entire tunnel is large, and therefore the disadvantages in terms of cost and construction period are not small.

[0006]

SUMMARY OF THE INVENTION The object of the present invention is to make the parallel pitch of the long steel pipe forepiling coarser than before, with the same degree of ground reinforcement, which can considerably reduce the construction cost of the tunnel as a whole, and considerably shorten the construction period. (EN) Provided is a long receiving method and a long receiving pile that can be shortened.

[0007]

The features of the long receiving method for a tunnel according to the present invention are that the inner and outer circumferences of at least the end portion of the pipe wall are
The surface has an uneven shape by rolling thread processing
For multiple element steel pipes that have become
A nut type screw type joint is screwed on the outside of the
This should be a pipe, or this should be
And thread a male screw type threaded joint inside the element steel pipe
As a long steel pipe with the same outer diameter over the entire length
Prior to the excavation of the
It is on the side .

The long receiving pile according to the present invention has the above-mentioned tonnage.
It is used for the long length receiving method of the flannel,
Even if the inner and outer peripheral surfaces of the ends are uneven, they are formed by rolling screw processing.
Multiple element steel pipes that are formed into rolling threads
And screw it to the outside of the ends of the multiple element steel pipes
Nut type threaded joint to connect the element steel pipe to
Note: These elements can be screwed inside the ends of multiple element steel pipes.
And a male screw type threaded joint for connecting steel pipes .

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to the drawings showing an embodiment of the present invention,
The present invention will be described below.

The element steel pipe 1 for the long steel pipe fore piling P is a rolled screw at the end of the pipe wall 1a or entirely. The one shown is of the latter type.

Prior to excavation, the element steel pipe 1 is applied to the outer peripheral portion of the tunnel face 2 while adding a required number of pipes to form a long steel pipe fore-piling P. FIG. 1 shows an outline of the overall construction for that, and FIG. 2 shows one pile of the long steel pipe forepiling P in an enlarged manner. The construction of the long steel pipe fore piling P itself may be performed with the same specifications as the conventional one.

The element steel pipe 1 is replenished by screwing a threaded joint 3 into the rolling screw at the end of the pipe 1. The threaded joint 3 may be a threaded type, that is, a nut type on the outside of the tube 1 as shown in FIG. 3, or a threaded type, that is, a male thread type on the inside of the tube 1 as shown in FIG. it can.

In the present invention, the element steel pipe 1 is filled with at least an end portion of the pipe wall which is a rolled screw. According to this, the strength of at least the end portion of the element steel pipe 1 is improved by the rolling process of the screw, and the long steel pipe forepiling P configured by adding the element steel pipe 1 enhances the proof stress of the pipe 1 connection portion. It is obtained as

Therefore, in the present invention, the connection portion is not fatigued by the impact or torque applied to the element steel pipe 1 during construction. Therefore, according to the present invention, the parallel pitch of the long steel pipe forepiling P can be made coarser than before with the same degree of ground reinforcement, and the cost of the tunnel as a whole can be considerably reduced, and the construction period can be shortened considerably.

When the pipe wall of the element steel pipe 1 is a rolling screw other than the end portion, the inner and outer peripheral surfaces of the pipe wall are uneven due to the rolling screw working, so that the inside of the long steel pipe is And when filling the gap between the pipe and the ground hole wall with the injection material, the bonding force of the injection material to the steel pipe and the bonding force between the steel pipe and the ground due to the injection material are improved, It is effective to suppress the ground subsidence of the long steel pipe fore piling P and improve the performance of preventing the ground loosening.

When the element steel pipe 1 is connected by a threaded joint inside the pipe 1, the long steel pipe obtained by joining the pipes 1 has the same outer diameter over the entire length, and when it is placed at a construction site, The driving resistance is small and a good driving condition can be obtained.

[0017]

As described above, according to the present invention, the parallel pitch of the long steel pipe forepiling can be made coarser than before with the same degree of ground reinforcement, and the construction cost of the entire tunnel can be considerably reduced, and the construction period can be completed. There is an effect that can be shortened. Also,
Rolled threads on the inner and outer peripheral surface of the element steel tube wall by thread forming
Form a threaded joint so that the threaded joint can be
A nut type or a screw type inside the pipe, that is, a male screw type
Can be one. For example, screw type fittings
When screwed in, the long steel pipe will have the same outer diameter over the entire length.
Therefore, the driving resistance can be reduced.

[Brief description of drawings]

FIG. 1 is a front view showing an outline of an example of a construction method according to the present invention.

FIG. 2 is an enlarged side view of one long steel pipe of the fore piling shown in FIG.

FIG. 3 is a side view showing a part of an example of connection of element steel pipes according to the present invention by cutting away.

FIG. 4 is a partially cutaway side view showing another example of connection of element steel pipes according to the present invention.

[Explanation of symbols]

P fore piling 1 element steel pipe 1a Pipe wall 2 tunnel face 3 threaded joint

   ─────────────────────────────────────────────────── ─── Continued front page       (56) References Japanese Patent Laid-Open No. 5-263577 (JP, A)                 Actual Kaihei 1-174500 (JP, U)                 Actual Kaihei 4-122808 (JP, U)                 Actual Kaihei 4-73098 (JP, U)                 Actual Kohei 2-333950 (JP, Y2)

Claims (2)

(57) [Claims] 1. An inner and outer peripheral surface of at least an end portion of a pipe wall is rolled.
The thread forming process creates a concavo-convex shape to form a rolled screw.
For a plurality of element steel pipes that are present, screw a nut type screw type joint on the outside of these element steel pipes,
Connect it to form a long steel pipe or reduce the driving resistance.
The inside of these element steel pipes so that
A long steel pipe that has the same outer diameter over the entire length by screwing and connecting hands
And then, prior to drilling the tunnel, the tunnel switching the long steel pipe
A long tunnel pre-construction method characterized by being applied to the outer periphery of the wing . 2. A long predecessor for the tunnel according to claim 1.
It is a long pile that is used for the method, and the inner and outer peripheral surfaces of at least the end of the pipe wall are
Multiple elements that are formed into a concavo-convex shape to form a rolled screw
These elements are screwed onto the outer side of the ends of the child steel pipe and the plurality of element steel pipes.
Nut type threaded joint for connecting child steel pipes, or
These element steel pipes are screwed inside the ends of several element steel pipes.
Long receiving pile with a male screw type threaded joint for connecting to .