JP3825536B2 - Repair structure of tunnel invert part - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a repair structure suitable tunnel invert portion used when repairing a bottom of the tunnel to be used, for example, as a guide canals.
[0002]
[Prior art]
In general, a tunnel used as a water conduit for a hydroelectric power generation facility, etc., is prominently deteriorated due to wear of an inverted portion on the bottom surface for many years.
[0003]
In order to repair only the invert part of such a tunnel, the use of the tunnel is interrupted and water is cut off, and then the concrete of the invert part of the tunnel is scraped off using a large breaker. The scraped concrete is divided by a hand-held breaker if necessary, and then collected, loaded onto a conveyor or a transport vehicle, and carried out of the tunnel.
And after finishing the concrete removal of the predetermined range of the invert part of a tunnel as mentioned above, the surface of a new invert part is formed by placing concrete here.
[0004]
[Problems to be solved by the invention]
However, the conventional methods as described above have the following problems. First, for example, when repairing the invert part of a small-diameter tunnel having an inner diameter of about 2.5 m or less, heavy machinery for turning the invert part, transporting glass, placing concrete, etc. cannot be put into the tunnel. Therefore, the above construction method cannot be applied. For this reason, in the past, when repairing the invert part of such a small-diameter tunnel, the actual condition is that the concrete of the invert part is manually beaten and new concrete is placed manually. In such a repair method, the work environment is poor because the work is performed in a narrow tunnel, and the work period is prolonged due to the poor efficiency. And if the construction period is prolonged, there is a problem in that the tunnel cannot be used during that period, so that the work such as power generation is also affected.
[0005]
In addition, there is also a problem that if concrete is newly placed on the surface of the deteriorated inverted portion, the concrete is often forced to be repaired due to its low durability.
[0006]
The present invention has been made in consideration of the above points, and provides a repair structure for a tunnel invert portion having higher quality and higher durability while efficiently performing work and reducing the work period. This is the issue.
[0007]
[Means for Solving the Problems]
The invention according to claim 1 is a repair structure of the invert part of the bottom surface of the tunnel, and the deteriorated invert part is in a state where wear is generated only in the mortar part of the surface of the invert part. And the state where not only the mortar portion but also coarse aggregate is worn is “wear level-2”, and the state where coarse aggregate is peeled is “wear level-3” Are classified into the “wear level-1”, the “wear level-2”, and the “wear level-3”, and the range of the “wear level-3” is a plurality of resin concrete formwork units. The curable filler is filled between the mold unit and the deteriorated invert portion, and the range of the "wear level-2" is applied with an underwater curable resin mortar, Above It is characterized in that the surface of the fat mortar is uniform so as to be continuous to the inverting portions of the formwork unit and the "wear level -1".
[0008]
Invention, in the repair structure of the tunnel invert portion of claim 1, wherein Rukoto the lowest portion of the central portion of the invert portion is laid drainage duct along the direction in which the tunnel is continuous according to claim 2 It is said.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an example of an embodiment of a tunnel invert repairing structure and its construction method according to the present invention will be described with reference to FIGS.
[0012]
FIG. 1 shows a tunnel repaired by applying the repair structure of an invert portion and its construction method according to the present invention. In this figure, reference numeral 1 denotes a deteriorated tunnel. As shown in this figure, the tunnel 1 used as a water conduit or the like has deteriorated due to wear of the inverted portion 2 at the bottom due to long-term use.
[0013]
In repairing such a deteriorated invert portion 2, first, the deterioration state of the invert portion 2 is classified into levels. For example, as shown in FIG. 2, a state in which only the mortar portion 3 on the surface of the invert portion 2 is worn is defined as “wear level-1”, and not only the mortar portion 3 but also the coarse aggregate 4 is worn. The state in which the coarse aggregate 4 is peeled off due to the further progress of deterioration is referred to as “wear level-3”.
[0014]
As shown in FIG. 3, after the deterioration state of the invert part 2 is classified into “wear level-1”, “wear level-2”, and “wear level-3” depending on the location, an appropriate material according to the level. Use the to repair. Here, the following repair is performed only for the “wear level-2” and “wear level-3” portions, without repairing the “wear level-1” portions. .
[0015]
For this, first, the deteriorated portion of the invert unit 2 is cleaned.
Subsequently, as shown in FIG. 1, the drainage duct 6 is laid along the direction in which the tunnel 1 continues in the lowest portion of the central portion of the invert portion 2.
[0016]
In addition, as shown in FIG. 3, a predetermined number of anchor members 7 such as chemical anchors are placed at predetermined positions at locations where the invert portion 2 is “wear level-3”.
[0017]
Thereafter, a predetermined number of embedded molds 8 are disposed in the range of “wear level-3”. The embedded molds 8 are made of a mineral material such as AS foam (trade name). It is made of resin concrete, which is a material that uses only a thermosetting polymer without using. Such an embedded mold 8 is unitized in advance to form the surface of the new invert portion 2, and the cross-sectional shape forms a curved shape corresponding to the surface of the invert portion 2, and the tunnel 1 is continuous. It has a predetermined length in the direction. As shown in FIG. 4, a mounting hole 9 for inserting the anchor member 7 is formed at a predetermined position of the embedded mold 8.
[0018]
In order to install each of the embedded molds 8, nuts 10 and 10 are so-called double nuts, for example, are attached to a predetermined height at the tip of each anchor member 7, and a washer 11 and a rubber plate 12 are attached. Next, each mounting hole 9 of the embedded mold 8 is passed through the anchor member 7, and a washer 13 and a nut 14 are attached to the distal end portion thereof, thereby fixing the embedded mold 8 to the anchor member 7. Further, the recess 15 formed in the upper portion of the mounting hole 9 for setting the nut 14 is closed with, for example, an epoxy sealant 16 or the like. Thereby, the embedded mold 8 is in a state of being supported at a predetermined level by the anchor member 7 and the nuts 10 and 10.
[0019]
Thus, as shown in FIGS. 4 and 5, after a plurality of embedded molds 8, 8,... Are arranged side by side in the direction in which the tunnel 1 continues, For example, an epoxy sealant (not shown) is filled between the embedded molds 8 and 8 to close the joints.
[0020]
Next, as shown in FIGS. 3 and 4, in the space between the embedded mold 8 supported by the anchor members 7, 7,... Filler 18 is injected. When the curable filler 18 is cured, the construction within the range of “wear level-3” is completed.
[0021]
Next, as shown in FIG. 3, the range of “wear level-2” on both sides of the embedded mold 8 is repaired. For this purpose, an underwater curing type resin mortar 20 or the like is applied to the range of “wear level-2” located on both sides of the embedded mold 8, and the surface thereof is applied to the embedded mold 8 and both sides of the “wear level− Leveling is continued so as to be continuous with the invert section 2 of “1”. And when this resin mortar 20 hardens | cures, repair of the invert part 2 of the tunnel 1 will be completed.
[0022]
As described above, in the repair structure of the invert part 2 of the tunnel 1 and its construction method, the deteriorated state of the invert part 2 that has deteriorated is classified into levels, and the surface of the new invert part 2 is applied to the most advanced part of the deterioration. The embedded mold 8 to be formed is arranged, and the other part is coated with an underwater curable resin mortar 20 to form a new surface of the invert portion 2. In this way, the deterioration state of the invert part 2 is divided into levels, and the optimal repair material is used for each level, so that the repair can be performed efficiently at a minimum cost. In addition, by using the embedded form 8 for repair, it is not necessary to work the concrete of the invert portion 2 and to place and cure new concrete, and it is not necessary to use heavy machinery, so the tunnel 1 has a small diameter. Even if it is a thing, construction can be facilitated and efficient, the working environment can be improved, and the construction period can be shortened. Furthermore, since the underwater curable resin mortar 20 is used for repair, the tunnel 1 can be used immediately after construction. In this respect as well, the construction period is shortened and the interruption period of operations such as power generation is minimized. Can be suppressed.
Further, by forming the surface of the invert part 2 with the resin-molded embedded form frame 8, it is possible to ensure high durability as compared with the case where the concrete is simply placed as in the prior art. High repair work can be performed.
[0023]
In addition, about the structure shown in the said embodiment, as long as it is in the range which does not deviate from the main point of the repair structure of the tunnel invert part which concerns on this invention, you may employ | adopt any structure.
For example, the construction sequence of the repair method, the after setting an embedded frame 8, after it is configured to inject a curable filling material 18 therebelow, which, lined with curable filler 18 The embedded mold 8 may be set on the top.
Furthermore, the tunnel 1 to be repaired is not limited to a small-diameter tunnel, but may be a large-diameter tunnel, and the shape and application thereof are not limited at all.
[0024]
【The invention's effect】
As described above, according to the repaired structure of the tunnel invert unit according to claim 1, the range of "friction level -3" of the inverter section having deteriorated is covered by Resin concrete formwork unit, formwork A curable filler is filled between the unit and the deteriorated invert portion, and an underwater curable resin mortar is applied in the range of “friction level-2” . In this way, by forming the surface of the invert part with a resin concrete formwork unit and resin mortar , it is possible to ensure high durability as compared with the case of simply placing concrete as in the past. High-quality repair work can be performed.
[0025]
In addition, by using the formwork unit in this way, it is not necessary to dig concrete in the invert part, new concrete placement / curing work, etc. Even in a small-diameter tunnel, the construction can be made easier and more efficient, the working environment can be improved, and the construction period can be shortened.
[0026]
Furthermore, the deterioration state of the deteriorated invert part is classified into levels, a formwork unit is arranged in the portion of “Wear level-3” where the deterioration has progressed most, and the underwater hardening is in the portion of “Wear level-2”. by then applying the type of resin mortar to form a surface of a new inverted portion can be applied efficiently repaired with minimal cost. Moreover, since the underwater curing type resin mortar is used, the tunnel can be used immediately after the construction.
[Brief description of the drawings]
FIG. 1 is an elevational sectional view showing an example of a tunnel repaired by applying a repair structure of a tunnel invert portion and its construction method according to the present invention.
FIG. 2 is a diagram showing an example of a level classification of a deterioration state of an invert part in the construction method.
FIG. 3 is a vertical sectional view showing a main part of FIG. 1;
FIG. 4 is an elevational sectional view showing an attachment part of a mold unit to the invert part.
FIG. 5 is a perspective view showing an installation state of the mold unit on an invert portion.
[Explanation of symbols]
1 Tunnel 2 Invert section 8 Embedded formwork (formwork unit)
18 Curable filler 20 Resin mortar

Claims (2)

The repair structure of the invert part on the bottom of the tunnel, where the deteriorated invert part is worn only in the mortar part of the surface of the invert part is defined as "wear level -1", and not only the mortar part The state where the coarse aggregate is worn is “wear level-2”, and the state where the coarse aggregate is peeled is “wear level-3”. ”,“ Wear level-2 ”, and“ Wear level-3 ”, and the range of“ Wear level-3 ”is covered with a plurality of resin concrete formwork units, and the formwork unit curable filler between the degraded inverted portion is filled with a range of the "wear level 2", together with the water-curable resin mortar is applied, the surface of the resin mortar before Repair structure of the tunnel invert portion, characterized in that it is uniform so as to be continuous to the inverting portions of the mold unit and the "wear level -1". In repairing the structure of the tunnel invert portion of claim 1, wherein, repair structure of the tunnel invert portion, wherein Rukoto drainage duct along the direction has been laid which tunnel is continuous to the lowest portion of the central portion of the invert portion .

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