JP4446629B2 - Drainage method in ultra-thin lining method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a drainage method in an ultra-thin lining method, and in particular, an ultra-thin that can efficiently drain water leaked after completion of construction by an ultra-thin lining method in an underground structure without destroying the lining surface. It relates to the drainage method in the lining method.
[0002]
[Prior art and problems to be solved by the invention]
Conventionally, as a secondary lining for shield tunnels, a coating method such as urethane is sprayed onto a segment that is a primary lining with a thickness of 2 to 3 mm, so that the tunnel's waterproofing, corrosion resistance, inner surface roughness, etc. are shielded. An ultra-thin lining method is known in which the secondary lining is lined extremely thin while securing the lining function in the case.
[0003]
However, as shown in FIG. 6A, the water leakage W from the natural ground G after completion of the construction by the ultra-thin lining method is, for example, between the inner surface of the segment 1 and the lining surface 4 through the grout hole 2 of the segment 1. The lining surface 4 is swollen by entering the space and peeling off the primer, and the inner cross section of the shield tunnel T is deformed. Further, even if the water leakage W is removed, the lining surface 4 has once undergone creep deformation, so the deformed portion L does not return to its original shape, and the inner surface smoothness is reduced. It becomes an obstacle to the natural flow of water.
[0004]
Accordingly, as shown in FIG. 6B, the lining surface 4 of the deformed portion L is cut and water is stopped, and the lining is applied to the deformed portion L again by the nozzle 5 as shown in FIG. 6C. Go and repair. The repair takes time and a lot of cost, and construction costs increase.
[0005]
Therefore, in the ultra-thin lining method, it is possible to efficiently drain the leakage after completion of construction by the ultra-thin lining method in the underground structure without destroying the lining surface and to reduce the construction cost. The technical problem which should be solved in order to obtain the drainage method arises, and this invention aims at solving this problem.
[0006]
[Means for Solving the Problems]
The present invention has been proposed in order to achieve the above-mentioned object, and a drainage method for leaking water from the underground structure in an ultra-thin lining method in which a coating material such as urethane is lined extremely thinly on the underground structure. In the case where a perforated sheet made of an elastic material is disposed on the inner surface of the underground structure at a location where water leakage is expected in advance, and its peripheral portion is fixed to the underground structure and a leakage pressure is applied. , A drainage method in an ultra-thin lining method for draining by forming holes in the perforated sheet so as to open by elastic deformation of the perforated sheet, and a coating material such as urethane for the underground structure In the method of draining water leaked from the underground structure in the ultra-thin lining construction method, a perforated sheet made of an elastic material is disposed on the inner surface of the underground structure where leakage is expected in advance. And The peripheral portion is fixed to the underground structure, and an inner water permeation preventing sheet for encapsulating the perforated sheet is disposed on the opposite side of the fixing surface, and one end of the perforated sheet is disposed on the perforated sheet. In the ultra-thin lining method, a lining surface having a predetermined thickness is applied to the underground structure after being fixed, and a drain hole is formed in the lining surface at the other end of the inner water permeation prevention sheet to drain water. It provides a drainage method.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. The same components as those in the conventional example will be described using the same reference numerals.
FIG. 1A is a longitudinal side view along the axial direction of a shield tunnel T, which is an underground structure below the groundwater level, and the shield tunnel T has segments 1 in the natural ground G as shown in FIG. , 1... Are assembled in a ring shape in the circumferential direction, and are assembled in a cylindrical shape in the axial direction to perform primary lining. In the figure, 3 indicates a joint surface of the segment 1. After that, an ultra-thin lining method was applied in which a coating material such as urethane was sprayed on the inner surface of the segment 1, 1... Form. At this time, for example, a circular perforated sheet 6a made of an elastic material having a size surrounding the grout hole 2 is disposed on the inner surface of the segment 1 below the grout hole 2 where water leakage W is expected.
[0008]
The perforated sheet 6a is formed of a rubber sheet, the thickness of which is the same as that of the lining surface 4, and a fixing surface is formed on the upper peripheral portion 7, and is fixed to the inner surface of the segment 1 with an adhesive or the like. To do. Further, a plurality of needle holes or slit-shaped water guide holes 8, 8... Are opened at predetermined intervals in the inside of the rubber sheet 6a other than the fixing surface 7, which is the peripheral portion, as shown in FIG. .
[0009]
The water guide holes 8, 8... Are closed in the absence of water leakage, so that no water enters or exits. However, when water leakage pressure is applied from the natural ground G, the rubber sheet 6a serves as a fulcrum with the fixing surface 7 as a fulcrum. The water guide holes 8, 8... Open while being elastically deformed toward the tunnel T, and the water leak W is drained into the shield tunnel T. When the water leakage pressure is removed, the rubber sheet 6a returns to its original state due to elastic deformation of the rubber sheet 6a, and the water guide holes 8, 8,. Thereafter, the lining surface 4 having the same thickness as the rubber sheet 6a is applied to the inner surfaces of the segments 1 and 1 other than the rubber sheet 6a.
[0010]
When the shield tunnel T is used as a sewer after completion of the shield tunnel T, the rubber sheet 6a is pressed against the inner surface of the segment 1 by the action of the internal water pressure against the internal water pressure of the shield tunnel T. Therefore, the water guide holes 8, 8... Are closed, and sulfuric acid generated from the sewage does not directly touch the segment 1. Accordingly, it is necessary to use a material having sulfuric acid resistance, wear resistance, etc. as the material of the rubber sheet 6a.
[0011]
Next, another embodiment will be described with reference to FIG. In the above-described lining method, the rubber sheet 6a and the lining surface 4 are not integrated, so that there is a problem with the smoothness of the inner surface of the shield tunnel T. Therefore, as shown in FIG. 2, in order to integrate the rubber sheet 6 b that is a perforated sheet and the lining surface 4, the rubber sheet 6 b is encapsulated to form the lining surface 4.
[0012]
FIG. 2A is a longitudinal side view along the axial direction of the shield tunnel T, and a rectangular rubber sheet 6b is disposed below the joint portion of the segment 1 where water leakage W is expected. Fixing surfaces 7 and 7 are formed at both ends of the rubber sheet 6b, and are fixed to the inner surface of the segment 1 with an adhesive or the like.
[0013]
Further, as shown in FIG. 2B, a plurality of slits 9 and 9 are opened at predetermined intervals in the rubber sheet 6b. In addition, the length of the slits 9, 9... Further, the action of the slits 9, 9... Is the same as the action of the water guide holes 8, 8, and the description thereof is omitted. Thereafter, the rubber sheet 6b is fixed to the inner surface of the segment 1, and then a coating film material such as urethane having a predetermined thickness is sprayed onto the lower part of the rubber sheet 6b and the inner surface of the shield tunnel T to form a lining surface. 4 is formed. The lining surface 4 encapsulates and integrates the rubber sheet 6b so that the inner surface of the shield tunnel T has the same roughness coefficient and is a continuous material characteristic of the coating material. Internal smoothness is maintained, and natural flow such as sewage is good.
[0014]
A slit or hole communicating with the slits 9, 9... Is formed in the lining surface 4 below the slits 9, 9 of the rubber sheet 6b, and drained into the shield tunnel T from that portion. To do.
As shown in FIG. 5 (b), the principle of drainage is that when the water leakage pressure is applied from the natural ground G, the rubber sheet 6b and the lining surface 4 behave integrally so that the water leakage W flows from the slits 9, 9. The drainage into the shield tunnel T is promoted. Further, when the water leakage W is completed, as shown in FIG. 5 (a), the rubber sheet 6b is elastically contracted to return to the original state, and the slit 9 is closed.
[0015]
Further, with respect to the erosion to the segment 1 due to the infiltration of sewage when the shield tunnel T is used as a sewer, the slit 9 is normally closed as shown in FIG. When an internal water pressure is applied from the side, the entire surface of the rubber sheet 6b is pressed against the segment 1 to cause elongation, and further, the slit 9 is closed and sewage does not permeate.
[0016]
However, there is a possibility that sulfuric acid, alkali, etc. may come into contact with the inner surface of the segment 1 through the slits 9, 9... When the inner pressure of the shield tunnel T is applied. This will be described with reference to FIG.
FIG. 3A is a longitudinal side view of the shield tunnel T, and the rubber sheet 6c, which is a perforated sheet disposed at the lower portion of the segment 1, and the fixing method thereof are the same as the rubber sheet 6b shown in FIG. The description is omitted. Now, an internal water permeation preventing sheet 10 that encloses the rubber sheet 6c is disposed on the shield tunnel T side opposite to the fixing surface 7 of the rubber sheet 6c. The inner water permeation preventing sheet 10 is formed of a non-porous sheet thinner than the rubber sheet 6c. The sheet 9 receives a water leak W from the slits 9, 9, and drains the slits 9, 9,. The role to be covered.
[0017]
Therefore, one end portion of the inner water permeation preventing sheet 10 is fixed to a fixing portion 7a provided at the lower end portion of the rubber sheet 6c, and the other end is disposed so as to be inclined. Thereafter, a lining surface 4 is formed by spraying a coating material such as urethane having a predetermined thickness to the lower part of the rubber sheet 6 c and the inner surface of the shield tunnel T. At that time, a drain hole 11 is opened between the lower portion of the rubber sheet 6 c and the inner surface of the shield tunnel T in the lining surface 4 in contact with the inclined tip portion of the inner water permeation preventing sheet 10. The planar position of the drain hole 11 is provided in the center of the inner water permeation preventing sheet 10 as shown in FIG. 3B, and is formed in a funnel shape to receive the leaked water W. The shield tunnel is formed from the drain hole 11. Drain into T.
[0018]
Now, when the shield tunnel T is used as a sewer, sulfuric acid or the like permeates from the drain hole 11 in the lining surface 4 when the shield tunnel T is operated with internal water pressure, but to the slits 9, 9... Of the rubber sheet 6c. Is prevented by the inner water permeation preventing sheet 10 and the inner water permeation preventing sheet 10 is further brought into close contact with the rubber sheet 6c by the inner water pressure, so that the penetration into the segment 1 is eliminated. Further, the inner surface of the shield tunnel T can be subjected to lining construction that ensures continuous inner surface smoothness.
[0019]
4A is a longitudinal front view of the shield tunnel T. After the rubber sheets 6b, 6b... Are fixed to the joint portion of the segment 1 where water leakage is expected, the lining surface 4 is attached to the inner surface of the segment 1. FIG. The state which formed is shown. 4B is a plan view of the inside of the shield tunnel T. After the rubber sheets 6a, 6a... Are fixed to the grout hole 2 of the segment 1 and the rubber sheets 6b, 6b. The state of forming the lining surface 4 is shown, and the operation and the like are as described above.
[0020]
In addition, the drainage method in the ultra-thin lining method of the present invention can be used for underground structures such as box culverts, fume pipes, and sewage treatment plants, in addition to the shield tunnel described above.
Thus, the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.
[0021]
【The invention's effect】
As described above, the invention according to claim 1 is provided with a perforated sheet made of an elastic material in an underground structure that is expected to leak in advance, and its peripheral portion is fixed to the underground structure. Since a hole in the perforated sheet is formed by the elastic deformation of the perforated sheet when water leakage pressure is applied, the drainage can be efficiently drained without destroying the lining surface. Even when the water leakage pressure is removed, the perforated sheet returns to its original state due to elastic deformation, the hole is closed, and no water enters or exits.
[0022]
According to the second aspect of the present invention, the perforated sheet made of an elastic material is disposed on the inner surface of the underground structure, and the periphery thereof is fixed to the underground structure. In addition, an internal water permeation preventing sheet encapsulating the perforated sheet is disposed between the lining surface and drained from a drain hole provided on the lining surface. Therefore, infiltration of internal water after the underground structure is used is surely prevented. Moreover, the inner surface of the underground structure can be subjected to a lining construction in which continuous inner surface smoothness is ensured, and there is no hindrance to natural flow after use.
[0023]
Thus, it is an invention that exhibits various remarkable effects, such as efficiently draining water leakage in the ultra-thin lining method and reducing the construction cost.
[Brief description of the drawings]
FIG. 1A is a longitudinal side view of an embodiment of the present invention, taken along the axial direction of a shield tunnel.
(B) The II arrow line view of Fig.1 (a).
FIG. 2 (a) is a longitudinal side view showing another embodiment and taken along the axial direction of the shield tunnel.
(B) FIG.
FIG. 3A is a longitudinal sectional side view along the axial direction of a shield tunnel, showing still another embodiment.
(B) Haha-hae view of FIG.
FIG. 4A is a longitudinal front view of a shield tunnel.
(B) A view from the direction of the arrow in FIG.
FIG. 5A is a cross-sectional view of a shield tunnel showing a state where a rubber sheet is attached.
(B) The cross-sectional view of the shield tunnel which shows a drainage state.
FIG. 6A is a longitudinal side view of a shield tunnel showing a leakage state of a conventional example.
(B) The longitudinal side view of the shield tunnel which shows the state which cut the lining surface.
(C) The longitudinal side view of the shield tunnel which shows the state which repaired the lining surface.
[Explanation of symbols]
1 Underground structure (segment)
4 Lining surfaces 6a, 6b, 6c Perforated sheet (rubber sheet)
7 Peripheral part (adhesion surface)
8 Water guide hole 9 Slit 10 Inside water penetration prevention sheet 11 Drain hole W Water leakage

Claims (2)

In the drainage method for leaking water from the underground structure in an ultra-thin lining method in which a coating material such as urethane is lined extremely thinly on the underground structure, the inner surface of the underground structure at a location where water leakage is expected in advance. When a perforated sheet made of an elastic material is disposed and the peripheral portion thereof is fixed to the underground structure and a leak pressure is applied, the holes in the perforated sheet are formed by elastic deformation of the perforated sheet. A drainage method in an ultra-thin lining method, characterized in that the drainage is formed so as to open. In the drainage method for leaking water from the underground structure in an ultra-thin lining method in which a coating material such as urethane is lined extremely thinly on the underground structure, the inner surface of the underground structure at a location where water leakage is expected in advance. A perforated sheet made of an elastic material is disposed on the inner surface, and the periphery thereof is fixed to the underground structure, and the perforated sheet is encapsulated on the opposite side of the fixed surface. After fixing one end of the sheet to the perforated sheet, a lining surface having a predetermined thickness is applied to the underground structure, and the other end of the inner water permeation preventing sheet is disposed in the lining surface. A drainage method in an ultra-thin lining method characterized by forming drainage holes and draining.

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