JP2001207788A - Limited backfilling injection work method in underground structure construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a limited backfilling injection work method capable of restraining looseness of natural ground and preventing an influence of track disturbance, etc., due to injection by instantly carrying out backfilling injection only at a limited required point after inserting construction to the natural ground of an element. SOLUTION: A filling bag 4 extending along the longitudinal direction of an element and inside of which an injection pipe 6 is stored is installed on an outer surface of a required element 1, and a backfilling material 12 is injected in the filling bag while drawing the injection pipe 6 out of the filling bag 4 after a head end of the element 1 reaches a specified position under an engineering method to construct an underground structure by element rows by drilling a natural ground part inside which is partitioned by these element rows after a large number of the lengthy elements 1 are arranged in parallel with each other and are sequentially inserted into natural ground.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a limited backfill injection method in an underground structure construction method, and more particularly, to a method in which a large number of elements are inserted into a ground below a vehicle running path such as a track or a road. Backfill injection method that fills the gap created between the element and the ground when constructing an underground structure that crosses the traveling path.

[0002]

2. Description of the Related Art As one of the underpass construction methods for constructing an underground structure (tunnel) crossing a track, a road or the like, a URT (Under) using a hollow box-shaped element made of steel.
Railway / Road Tunnelling
Method) is known. This construction method is a construction method in which a number of long elements are arranged in parallel and sequentially inserted into the ground, and then the ground part partitioned inside the element row is excavated to use the element row as an underground structure.

[0003] Each element is inserted into the ground by traction or propulsion while excavating the ground with a drilling device (blade) connected to the tip of the element. It is inevitable that voids will form between them. For this reason, backfill implantation is conventionally performed to fill the void.

[0004] However, the conventional backfill injection method is
After laying all the elements, it is common to inject from the inside of a shaft, and the following problems have occurred. (1) Although a gap is generated every time each element is inserted into the ground, time elapses after each element is inserted, and it is not possible to immediately respond to loosening of the ground. (2) Since the backfill material is directly injected into the soil, the injection path is uncertain and may not be injected at the required location. (3) On the other hand, due to the nature of the backfill material, there was a tendency for the material to flow into unnecessary places, for example, through the interface between the soil and the element. (4) In particular, when the earth cover is shallow, for example, a situation where the track floor leaks to the track surface may occur.

As a method of injecting the backfill material, for example, as disclosed in Japanese Patent Application Laid-Open No. 8-144696, a filling bag for injecting the backfill material into the girder material inserted into the ground is used. A mounting method has also been proposed. If such a bag is attached to the element, backfill injection can be performed immediately only at a necessary portion.

However, simply inserting a bag into the element and performing backfill injection does not allow the injection pressure to be uniform because the element is long. May be affected.

[0007]

SUMMARY OF THE INVENTION The present invention has been made on the basis of the above technical background, and has the following objects. It is an object of the present invention to immediately backfill only a limited required portion after the element is inserted into the ground, thereby suppressing the loosening of the ground, and further improving the track deformation due to the injection. It is an object of the present invention to provide a limited backfill injection method in an underground structure construction method capable of preventing the influence.

[0008]

The present invention employs the following means to achieve the above object. That is, according to the present invention, a plurality of long elements are juxtaposed in parallel and sequentially inserted into the ground, and then an inner ground portion defined by the element rows is excavated to construct an underground structure by the element rows. In the construction method, on the outer surface of the required element, extends along the longitudinal direction of the element,
And, after filling the filling bag in which the filling tube is housed inside, and after the tip of the element reaches a predetermined position, injecting the backfill material into the filling bag while pulling out the filling tube from the filling bag. And the limited backfill injection method in the underground structure construction method.

According to the present invention, since backfilling is performed using the filling bag, after the element is inserted into the ground, only a limited necessary portion can be immediately filled with the backfill material. The loosening of the ground with the passage of time can be reliably suppressed. In addition, since the backfill material is injected while pulling out the injection pipe built in the filling bag, the backfill material can be injected with uniform pressure over the entire length of the filling bag, and the roadbed is raised due to excessive pressure. It does not affect the orbit.

[0010] The filling bag is set in the form of a roll inside the tip of the element, and is pulled out of the outer surface as the element is inserted into the ground. The underground structure formed by the element rows includes an upper floor slab and a side wall slab, and the filling bag is mounted on the upper and lower surfaces of each of the elements constituting the upper floor slab, and backfilling is performed. further,
The filling bag is mounted on the outer surface of the element at the corner formed by the upper floor slab and the side wall slab, and backfilling is performed.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing an element with a filling bag, FIG. 2 is a plan view, and FIG. 3 is a cross-sectional view cut at a right angle to the element axial direction. The element 1 is made of hollow steel and has a long shape and a rectangular cross section.

As shown in FIG. 8, a large number of such elements 1 are sequentially inserted while being connected in parallel to each other on a ground under a traveling road such as a track or a road. Then, concrete is poured into the inside of each element 1, the element row is used as a lining wall, and the inner ground portion 2 defined by the element row is excavated. Things are built.

Referring again to FIGS. 1 to 3, a filling bag 4 is provided as a roll body 5 inside the required element 1. The filling bag 4 is flexible, and can be pulled out on the outer surface of the element 1 in a belt shape along the longitudinal direction. A similarly flexible injection tube 6 is accommodated inside the filling bag 4. The number of the filling bags 4 can be singular or plural depending on the size of the cross section of the element 1 (two in the illustrated example).

FIGS. 4 to 7 are sectional views showing the procedure of the method of the present invention. A starting shaft 7 and a reaching shaft 8 are excavated on both sides of a traveling path such as a track or a road. Element 1
Is usually inserted into the ground while extending in its axial direction,
As shown in FIG. 4, the end of the packing bag 4 pulled out from the roll body 5 to the outer surface of the element in a strip shape is temporarily fixed to the rear end of the leading element 1.

An excavator 10 is connected to the head element 1 through an intermediate element 9. The excavator 10 excavates the element 1 by pulling or propelling the ground 1 from the starting shaft 7 to the reaching shaft 8. It is inserted in the mountain. When the leading element 1 is almost completely inserted into the ground, a subsequent element (not shown) is added. At this time, the filling bag 4 is pulled out and temporarily fixed to the rear end of the subsequent element. Hereinafter, similarly, the filling bag 4 is pulled out as the element is inserted.

Then, the tip of the element 1 is
(FIG. 5), the end portion 11 of the filling bag 4 is immediately closed as shown in FIG. 6, and the backfill material 12 is injected into the filling bag 4. At that time, backfill material 12
Is injected while pulling out the injection tube 6 from the filling bag 4 by the injection tube 6. The backfill material 12 is injected by adjusting the pressure depending on the condition of the ground.

When the backfill material 12 is injected, the filling bag 4 expands, adheres to the ground in a shape adapted to the gap between the ground and the element 1, and fills the gap. FIG. 7 shows a state immediately before the completion of the injection. When the injection tube 6 is completely pulled out of the filling bag 4, the other end 13 is closed.

According to the backfilling method using the filling bag 4, backfilling can be immediately performed only at limited necessary places, and the loosening of the ground can be suppressed. Further, since the backfill material is injected while pulling out the injection pipe 6 built in the filling bag 4, the backfill material 12 can be injected at a uniform pressure over the entire length of the filling bag 4 and the excess pressure can be applied. There is no impact on the track, such as the uplift of the trackbed due to.

FIG. 8 shows a portion where back filling by the filling bag 4 is performed. The filling bag 4 forms the upper and lower surfaces of the upper floor element 1 constituting the upper floor plate 15 and the lower floor plate 16. It is mounted on the lower surface of the lower floor element 1 and backfilled and injected into those parts. The filling bag 4 includes not only the upper surface of the upper floor element 1 but also the lower surface and the lower floor element 1.
The upper floor slab 15 and the lower floor slab 16 function as an integral beam structure and can be prevented from subsidence by being mounted on the lower surface of the slab and injected into the back. The filling bag 4 on the lower surface of the upper floor element 1 is removed when excavating the ground portion 2.

Further, as shown in FIG. 9 in an enlarged manner, the filling bag 4 is formed on the outer surface of the element 1 constituting the corner portion (shoulder portion) 20 formed by the upper floor slab 15 and the side wall slab 17, as a whole. It is attached so as to form a hook and is injected back into the site. In the corner portion 20, the ground around the gap easily collapses, and there have been many accidents that lead to collapse in the past.

In order to prevent this, conventionally, the corner 2
Countermeasures were taken such as laying one discarded element outside the zero. Compared to such a conventional measure, the backfill injection using the filling bag 4 is also performed on the outer surface of the corner portion 20 by the present method, as described above, so that the backfill injection that is in close contact with the shoulder portion is possible. Thus, it is possible to prevent the loosening of the ground due to the collapse from expanding.

Referring to FIG. 8 again, since the limited backfilling with the filling bag 4 is performed immediately after the laying of each element 1, it can be expected to be immediate. In order to supplement the backfill injection by the packing bag 4, the upper deck 1
5. Each time the side wall slab 17 and the lower slab 16 are constructed, the backfill material 21 is injected from inside the element to the outer periphery of the slab. As a result, the underground structure including the upper slab 15, the side wall slab 17, and the lower slab 16 is brought into close contact with the ground as a final structure, and complete void filling is performed.

The above embodiment is merely an example, and the present invention can be variously modified. For example, backfilling with a filling bag is a desirable mode to be carried out immediately after each construction of one element, but also backfilling after insertion of a plurality of elements depending on the construction situation, It is included in the concept of the present invention.

The cross-sectional shape of the element is not limited to a square,
For example, various shapes such as a U-shape disclosed by the present applicant in Japanese Patent Application Laid-Open No. H11-247579 can be used. The shape of the underground structure to be constructed is not limited to the box shape as shown in the figure, but may be various shapes such as a gate shape.

[0025]

As described above, according to the present invention, since backfilling is performed by using a filling bag, after the element is inserted into the ground, the backfill material is immediately provided only at a limited necessary place. And the loosening of the ground with time can be reliably suppressed.

Further, since the backfill material is injected while pulling out the injection pipe built in the filling bag, the backfill material can be injected at a uniform pressure over the entire length of the filling bag, and the excess pressure can be applied. There is no impact on the track, such as the uplift of the trackbed.

[Brief description of the drawings]

FIG. 1 is a side view showing an element equipped with a filling bag.

FIG. 2 is a plan view of the same element.

FIG. 3 is a sectional view of the same element cut at a right angle to the axial direction.

FIG. 4 is a sectional view showing a procedure of the present invention method.

FIG. 5 is a sectional view showing a procedure following FIG. 4;

FIG. 6 is a sectional view showing a procedure following FIG. 5;

FIG. 7 is a sectional view showing a procedure following FIG. 6;

FIG. 8 is a cross-sectional view showing a portion where backfill injection is performed by a filling bag.

FIG. 9 is a cross-sectional view showing, in an enlarged manner, backfill injection into a corner portion by a filling bag.

[Explanation of symbols]

 1: Element 2: Ground part 4: Filling bag 5: Roll body 6: Injection pipe 7: Starting shaft 8: Reaching shaft 10: Excavator 12: Backfill material 15: Upper floor plate 16: Lower floor plate 17: Side wall Plate 20: Corner 21: Backfill material

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshihiko Niibori 2-2-2 Yoyogi, Shibuya-ku, Tokyo Inside Japan Railway Company (72) Inventor Seiji Tamitsu 2-2-2 Yoyogi, Shibuya-ku, Tokyo No. Tohoku Japan Railway Company (72) Takao Kurita, Inventor 2-2-2 Yoyogi, Shibuya-ku, Tokyo Institution (72) Inventor Masaharu Saito 2-chome, Misakicho, Chiyoda-ku, Tokyo 5-3 Tetsu Ken Construction Co., Ltd. (72) Inventor Akio Iwai 2-3-5 Misaki-cho, Chiyoda-ku, Tokyo (72) Inventor Seiji Tanaka Seiji Tanaka, Misaki-cho, Chiyoda-ku, Tokyo 5-3, Tetsu-Ken Construction Co., Ltd. Kyoto Chiyoda-ku Misaki-cho, chome No. 5 No. 3 iron Ken Construction Co., Ltd. in the F-term (reference) 2D054 AB05 AC08 AD22 2D055 BA04 BB03 DA11 JA04 LA18

Claims (4)

[Claims] 1. After a number of long elements are juxtaposed and sequentially inserted into the ground, an inner ground portion defined by the element rows is excavated to construct an underground structure by the element rows. In the construction method, on the outer surface of the required element, a packing bag extending along the longitudinal direction of the element and containing an injection tube therein is attached, and after the tip of the element reaches a predetermined position, A limited backfill injection method in an underground structure construction method, wherein a backfill material is injected into the filling bag while pulling out an injection pipe from the filling bag. 2. The underground base according to claim 1, wherein the filling bag is rolled and installed in the tip of the element, and the element is pulled out to the outer surface as the element is inserted into the ground. Limited backfill injection method in structure construction method. 3. The underground structure according to the element row includes an upper floor slab and a side wall slab, wherein the filling bag is attached to an upper surface and a lower surface of each element constituting the upper floor slab, and backfilling is performed. The limited backfill injection method in the underground structure construction method according to claim 1 or 2, wherein: 4. The underground structure construction according to claim 3, wherein said filling bag is mounted on an outer surface of an element at a corner formed by said upper floor slab and said side wall slab, and backfilling is performed. Limited backfill injection method in the construction method.