JP3481489B2 - Repair method of tunnel inner wall - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for repairing an inner wall of an annular structure, and in particular, it is used as a so-called "community groove" or the like where a gas pipe, a telephone wire, etc. are excavated in the ground and are installed therein. The technology for repairing the inner wall of a tunnel.

[0002]

2. Description of the Related Art In recent years, a so-called "communal ditch" tunnel in which gas pipes, telephone lines, sewer pipes and the like are installed has been constructed underground. The tunnel is usually cylindrical, and is constructed using, for example, a shield tunnel construction method (abbreviated shield method).
Such a tunnel has a structure in which the inner surface of the excavated hole is lined with concrete or a steel plate.

However, the lining is corroded by a substance contained in groundwater or soil and deteriorates with age. Therefore, the deteriorated portion needs to be repaired appropriately. This repair is
Conventionally, it has been common to carry a steel member whose inner periphery is divided into a large number into the tunnel, connect the joints to each other to form a tubular body, and cover the inner wall of the deteriorated portion. Therefore, it has been necessary to load the members to be used on a trolley to a work place (hereinafter, referred to as a work site) and convey them, and to join the joints of the steel members by welding, bolting, caulking, etc., and assembling them into a pipe. That is, unless a large number of divided steel members are used, it is too large to convey the inside of the hole to the tip thereof. Further, as disclosed in Japanese Utility Model Laid-Open No. 59-3079, a steel pipe that has been wound to a degree of elastic deformation and reduced in diameter may be carried into a tunnel and expanded on site so that it contacts the inner wall of the tunnel for repair. It was conducted.

However, in the repair method using the steel members divided into a large number of pieces as described above, since there are many joining points of the steel members, not only are there many joining parts, but also many joining and water-stopping work, and the working time is long. There is a problem that not only it becomes long, but also the cost increases. Further, in the use of the rolled-in reduced diameter steel pipe described in Japanese Utility Model Laid-Open No. 59-3079, when the steel pipe is carried in, existing equipment in the tunnel is removed, or it is difficult to carry it in a curved passage of the tunnel. There was a problem of becoming. Further, every time one steel pipe is carried in, the existing wiring and piping must be removed and re-connected through the rolled-in steel pipe before it can be carried in, and like the above, the repair work requires a long time, The economy was also poor.

[0005]

SUMMARY OF THE INVENTION In view of such circumstances, it is an object of the present invention to provide a method of repairing an inner wall of a tunnel which enables a work to be performed more quickly than in the conventional case even if a steel member is used.

[0006]

In order to achieve the above-mentioned object, the inventor reviewed the conventional repair method using a steel member and made diligent efforts to improve it. And the result was completed as the present invention.

Accordingly, the present invention, upon repair by lining the steel member to the tunnel inner wall, and the steel member
Cross section prepares an arcuate two members Te, the arc length of the long
A method for repairing an inner wall of a tunnel is characterized in that one member is elastically deformed in a direction in which a cross-sectional area of the member is reduced , and then the member is loaded into the tunnel, restored at a repair position and joined together. Further, the present invention provides a steel member on the inner wall of the tunnel.
When lining and repairing the
Prepare two members with an arc-shaped cross section and equal arc lengths
However, elastic deformation is applied in the direction in which the cross-sectional area of each member decreases.
After that, bring it into the tunnel and restore it at the repair position.
Repairing the inner wall of the tunnel characterized by joining the two
Is the way.

Further, in the present invention, it is preferable that the center angle of the steel member of one small member is 40 ° to 120 ° in the two divisions.

Further, according to the present invention, the axial opening of the steel member having a reduced cross-sectional area can be brought into the tunnel by facing the inner curved surface of the curved inner wall of the tunnel. Therefore, even if the tunnel is bent, it can be easily carried in.

According to the present invention, even if a steel member is used, the transport and assembly in the tunnel can be carried out smoothly and quickly, so that the inner wall of the tunnel can be repaired more quickly than before. In particular, the present invention exerts a great effect in a tunnel having a curved passage.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

First, the tunnel inner wall repairing method according to the present invention is performed by connecting a pair of two steel members 1 bent into a tubular shape along the entire tunnel inner wall surface 6 with a joint and lining them. It is a technology to do. Specifically, two steel members are used which are formed by bending a transverse section of the tubular body into two parts at a forming factory. The two steel members may have the same shape by dividing the tubular body into two in the longitudinal direction.
Before the two steel members are loaded into the tunnel, as shown in FIG. 2, they are elastically deformed so that the opening at the peripheral end is reduced, temporarily fixed, and loaded into the tunnel. Specifically, as shown in FIG. 2, the wire fixing member 9 is installed at at least two places on the inner surface of the steel member, and the wire 10 stretched between the wire fixing members 9 is pulled by the chain block 11 or the like to open the opening portion. Can be elastically deformed to reduce. The elastic deformation limit can be calculated according to the material and shape of the steel member, the position of the wire fixing member, and the like. If the opening is reduced below that limit, the steel member will spontaneously take the shape of the inner wall of the tunnel when it is carried into the tunnel and, after reaching the predetermined position, the tension of the chain block or the like is released. The inner wall for repair can be formed in conformity. Similarly, the other divided steel member remains in the same state when it can be carried into the tunnel without reducing the opening, and when it needs to be contracted, it is contracted and carried into a predetermined position. By connecting the steel member and the divided portion together, the entire inner circumference of the tunnel is repaired by the steel member of the tubular body.

Further, the steel member according to the present invention is shown in FIG.
As shown in (a), the central angle θ2 of one small member is 4
It is more preferable to use two types, a large (excellent arc) member 2 and a small (inferior arc) member 3, so that the angle is 0 ° or more and 120 ° or less. This is because the small member 3 can be carried into the tunnel in its original shape, and the work of elastically deforming and fixing it before carrying it in the tunnel can be omitted. At this time, small
If the central angle of the member 3 exceeds 120 °, it becomes difficult to carry the member 3 into the tunnel without changing its shape. On the other hand, if the central angle is less than 40 °, the shape of the other large member becomes too large, and when it is elastically deformed and carried into the tunnel, it interferes with the existing equipment or pipes in the tunnel, or This causes a problem that the conveyance in the curved portion is hindered.

Further, these two steel members are subjected to necessary processing so that their peripheral ends form joints. Welding or bolting can be frequently used as the means of the joint.

In addition, according to the present invention, when the large-sized steel member is carried into the tunnel, as shown in FIG. 3, the axial opening of the steel member reduced inward is curved in the tunnel. It is preferable to face the inner curved surface of the inner wall. This is because the curved portion can be easily passed therethrough.

In addition, in the case of carrying out the present invention, air / mortar, resin mortar, etc. are injected between the tubular steel member assembled along the tunnel inner wall surface 6 and the inner wall to repair the repaired portion. Try to strengthen. Also, for the same purpose, anchor bolts and lock bolts may be built in the tunnel inner wall via a steel member. Furthermore, when water-tightening measures are required at the joint portion, it is preferable to use a seal member such as water-expandable rubber.

[0017]

EXAMPLE A damaged inner wall was found in a part of a tubular and curved tunnel having an inner diameter of 2750 mm.
The radius of curvature of the curved part is 60 m, the distance to the damaged part is 200 m from the tunnel entrance, and the length of the damaged part is 80 m.
It was m.

Therefore, the repairing method according to the present invention was adopted to repair the inner wall. The steel member used has a thickness of 1
A 6 mm-welding steel plate (for example, SM490A) was used for processing, and a large member having a central angle of 270 ° in the cross section and a small member having 90 ° were manufactured as a pair. The axial length of each member in the tubular form is 4 m.

At this time, the joints installed at both circumferential ends of the cross section of the large member were connected by the wire 10 via the chain block 11. In this case, since the length in the axial direction was 4 m, the connection by this wire was performed at 3 places for each 1 m, whereby the distance between the peripheral ends of the cross section was initially 1
It was 945 mm, but could be reduced to 1800 mm.

First, these steel members were placed on the carriage 7 from the entrance of the tunnel and sequentially carried into the tunnel. At that time, the opening 8 in the axial direction of the large-sized member 2 was initially directed to the bottom surface in the tunnel, but in the case of approaching the curved portion while advancing in the tunnel, it faces the inner curved surface of the curved portion. In this way, it was transported while adjusting its posture. As a result, it was possible to easily pass through any of the curved portions. Since the existing wiring, piping, and equipment are passed through the opening in the axial direction, these did not hinder the transportation at all.

The steel members that have reached the repair point naturally fit the inner circumference of the tunnel by releasing the tension of the chain block 11 at predetermined positions. A small member corresponding to this large member was carried in in its original shape and similarly placed at a predetermined position. As a result, the joint portions of the large-sized member and the small-sized member were fitted together, and the joints were welded to each other to form a tubular body that conformed to the inner surface of the existing tunnel.

By the same operation as described above, the steel members were successively loaded into the tunnel to form the tubular body, and the tubular bodies were welded and joined together in the axial direction to form the inner surface of the tunnel.
At that time, resin mortar was injected into the gap between the steel member that repaired the inner wall of the existing tunnel to reinforce the repaired part.

As a performance result, 20 sets of steel members were
After the start of loading into the tunnel, all the sets were joined and the time until the completion of mortar reinforcement was evaluated. That is, according to the repair method of the present invention, the repair work was completed in 180 hours. On the other hand, in the case where the repair of the same scale is repaired by the conventional method of using a steel member having a large number of divided transverse sections, it takes 290 hours. Therefore, it was confirmed that the time required for repairing the inner wall of the tunnel was significantly shortened by the present invention as compared with the conventional case.

Although the tunnel of the above embodiment is the so-called "community groove" described above, the present invention is not limited to this.
It can be applied to tunnels for any purpose, including those for automobiles, trains, etc. Further, the tubular body formed of the steel member is not limited to a circular cross section, and may be an ellipse, a rectangle, or the like. If the cross section is not circular, the angle formed by the line segment connecting the dividing points of the two divided members and the center of gravity with the center of gravity of the tunnel cross section as the center is 40 to 120 °. Just divide it.

[0025]

As described above, according to the present invention, the repair of the inner wall of the tunnel using the steel member has been remarkably speeded up from the conventional one. Also, repair costs have come to be reduced.

[Brief description of drawings]

FIG. 1 is a diagram for explaining the shape of a steel member used in a repairing method according to the present invention, in which (a) is a sectional view and (b) is a perspective view.

FIG. 2 is a diagram showing a reduction state of a large steel member due to elastic deformation.

FIG. 3 is a view showing one posture of a steel member carrying posture in a tunnel.

[Explanation of symbols]

1 Steel member 2 Large parts 2'Reduced state of large member 3 Small parts 4 joints 5 Volts 6 Inner wall surface of the tunnel 7 dolly 8 Axial opening 9 Wire fixing member 10 wires 11 chain block θ1 Center angle of large member θ2 Central angle of small member

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takeshi Koike 2-3-2 Uchisaiwaicho, Chiyoda-ku, Tokyo Inside Kawasaki Steel Co., Ltd. (72) Tadashi Teramoto 2-3-2 Uchiyuki-cho, Chiyoda-ku, Tokyo Kawasaki Steel (72) Inventor Akira Adachi 2-9-7 Ikenohata, Taito-ku, Tokyo Kawa Tetsu Techno Construction Co., Ltd. (72) Inventor Yu Murakami 2-9-7 Ikenohata, Taito-ku, Tokyo Kawatetsu Techno Construction Within the corporation (56) Reference JP-A-5-147702 (JP, A) JP-A-7-208093 (JP, A) Actual development Sho 59-3079 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21D 11/15

Claims (2)

(57) [Claims] 1. When lining and repairing a steel member on an inner wall of a tunnel, two steel members having an arc-shaped cross section are prepared as the steel member, and a member having a longer arc length is used. A method for repairing an inner wall of a tunnel, which comprises elastically deforming in a direction in which the area is reduced, then carrying in the tunnel, restoring it at a repair position and joining the two together. 2. A steel member is lined on the inner wall of the tunnel to supplement it.
When I fix it, The steel member has an arc-shaped cross section and an equal arc length.
Prepare two new members and reduce the cross-sectional area of each member
After being elastically deformed in the direction of
However, it is characterized by restoring at the repair position and joining the two.
How to repair the inner wall of the tunnel.