JP2006274630A - Tunnel lining concrete exfoliation preventing method and its structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tunnel lining concrete exfoliation preventing method and its structure for suppressing the impediment amount of an inner void cross section without increasing the thickness (rigidity) of exfoliation preventing members in the case of preventing exfoliation of large exfoliation lumps, and preventing exfoliation of even exfoliation lumps of different sizes by one method. <P>SOLUTION: In the tunnel lining concrete exfoliation preventing method, the exfoliation preventing members 17-20 connected through shackles 13-16 to a support plate 12 fixed by an anchor 11 are arranged on the lining concrete 10. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a tunnel lining concrete peeling prevention method and a structure thereof.

  The inventors of the present application have already proposed a high-accuracy tunnel soundness diagnostic system by collectively determining the soundness level against collapse and the mechanical soundness level against external force (Patent Document 1 below).

  Conventionally, the following methods have been used as methods for preventing the peeling of tunnel lining concrete.

  FIG. 6 is an overall cross-sectional view showing a conventional tunnel lining concrete peeling prevention method.

In this figure, 101 is lining concrete, 102 is a portion that may be collapsed on a large scale, 103 is a lump of flaking, 104 is a main material of a collapsing prevention material, and 105 is a fall preventing installation range (example).
Japanese Patent Application No. 2004-012616

  Selection of the lining concrete peeling prevention method is determined in consideration of the following conditions.

(1) Expected size of exfoliated mass (rigidity of anti-exfoliation method)
(2) Permissible hindrance to the inner cross-section (thickness of peeling prevention method)
(3) State of lining such as the degree of water leakage (attachment method of anti-peeling method)
Generally, in order to prevent the exfoliation of a large exfoliation lump, an anti-exfoliation material having high rigidity is required, and it has a thickness. As a result, there are demerits such as an increase in cost due to the use of a high-rigidity material and an increase in the amount of hindrance to the inner air cross section.

  Further, the conventional tunnel lining concrete peeling prevention method has a problem as shown in FIG.

  7A and 7B are diagrams showing a peeling prevention mechanism of a conventional construction method. FIG. 7A is a partial front view, and FIG. 7B is a partial side view.

  In a portion 102 where there is a possibility of large-scale collapse, a main material (such as an L-shaped steel material) 104 that is a peeling prevention material is fixed to the lining concrete 101 with an anchor 106 or the like. Therefore, the bending moment 107 indicated by the arrow acts on the main material 104 of the peeling prevention material, and the bending + axial force 108 acts on the anchor 106.

  In this manner, since the anchor 106 has a bending + axial force 108, if there is a large-scale collapse, vibration accompanying the passage of the train is also added, and the anchor 106 cannot be supported and a large-scale collapse occurs. There was also a risk of a train accident.

  In view of the above situation, the present invention can suppress the amount of hindrance in the inner air cross section because it does not increase the thickness (rigidity) of the anti-peeling material even in the case of preventing the exfoliation of a large exfoliation lump. It is an object of the present invention to provide a tunnel lining concrete peeling prevention method and a structure thereof capable of preventing the peeling of different sizes of lumps with one method.

In order to achieve the above object, the present invention provides
[1] In the tunnel lining concrete peeling prevention method, a peeling prevention material connected through a shackle to a support plate fixed to the lining concrete with an anchor is provided.

  [2] In the peeling prevention method according to [1], an expansion / contraction shackle is disposed between the peeling prevention materials connected to the shackle.

  [3] In the peeling prevention method according to [1] or [2], the shackle is arranged on four sides of the anchor, and a peeling prevention material is arranged on the four sides of the anchor.

  [4] In the peeling prevention method described in [1], [2] or [3] above, a waterproof sheet is disposed on the lining concrete surface.

  [5] In the peeling prevention method according to [1], [2], [3] or [4], a net material is disposed on the surface of the lining concrete.

  [6] In the tunnel lining concrete peeling prevention structure, a support plate fixed to the lining concrete with an anchor, a shackle fixed on the support plate, and the lining concrete surface fixed to the shackle. And an anti-peeling material disposed on the surface.

  [7] The tunnel covering concrete exfoliation preventing structure according to [6] above, comprising four shackles arranged on four sides of the anchor.

  [8] The tunnel lining concrete peeling prevention structure according to the above [6] or [7], wherein the peeling prevention material is a steel material, a highly elastic precast material, or a fiber material.

  [9] In the tunnel lining concrete peeling prevention structure according to [6], [7] or [8], a net member is provided between the lining concrete and the support plate. .

  [10] In the tunnel lining concrete peeling prevention structure according to [6], [7], [8] or [9], a nonflammable waterproof sheet is provided between the lining concrete and the support plate. It is characterized by doing.

  [11] In the tunnel lining concrete peeling prevention structure described in [6], [7], [8], [9] or [10], the peeling prevention material is a net material. To do.

  According to the present invention, the following effects can be achieved.

  (1) By using a pin structure for the anti-peeling material supported by the strong anchors used, it is possible to prevent the collapse of large exfoliated masses even with a small rigidity, and the amount of inhibition to the internal cross-section by the anti-exfoliation method is reduced. Can be suppressed.

  (2) By using at least two or more exfoliation preventing materials having different exfoliation resistance strengths, exfoliation of different sizes can be prevented by one method.

  The tunnel lining concrete peeling prevention method and the structure thereof according to the present invention are connected via a shackle to a support plate fixed to the lining concrete with an anchor in the tunnel lining concrete peeling prevention method. Place anti-strip material consisting of chains. Therefore, the fall by peeling of the lining concrete of a tunnel can be prevented exactly.

  Hereinafter, embodiments of the present invention will be described in detail.

  FIG. 1 is an overall cross-sectional view showing a tunnel lining concrete peeling prevention method according to an embodiment of the present invention, and FIG. 2 is a diagram showing a mechanism for preventing the peeling of a tunnel lining concrete according to an embodiment of the present invention. FIG. 2 (a) is an explanatory diagram, and FIG. 2 (b) is a diagram showing a case of the normal peeling lump, and FIG. The side view of the anti-peeling material in FIG. 2 is the same as that in FIG.

  In FIG. 1, 1 is lining concrete, 2 is a part which may be collapsed on a large scale, 3 is a lump of peeling, 4 is a main material of a peeling prevention material, and 5 is a peeling prevention installation range (example).

  Therefore, as shown in FIG. 2A, the main material 4 of the peeling prevention material is fixed to the lining concrete 1 with a strong anchor 6 and is connected via a shackle 7. That is, a peeling prevention material composed of a chain is formed.

  Further, the central part of the main material 4 of the peeling prevention material is connected by an expansion / contraction shackle 8.

  Therefore, as shown in FIG. 2 (a), the fall of a normal peeling lump is prevented by the main material 4 of the peeling preventing material.

  In addition, as shown in FIG. 2 (b), when large scale peeling occurs in the middle part of the strong anchor 6, the middle part of the main material 4 of the peeling prevention material is lowered and the expansion and contraction shackle 8 is extended. No bending moment acts on 6, and only the axial force 9 acts, so that it can be firmly fixed.

  FIG. 3 is a partial plan view of a strong anchor showing a first embodiment of the peeling preventing method of the present invention, FIG. 3 (a) is a plan view thereof, and FIG. 3 (b) is a sectional view thereof.

  In these drawings, 10 is lining concrete, 11 is a strong anchor, 12 is a support plate fixed by the strong anchor 12, 13 to 16 are shackles arranged in four directions, and 17 to 20 are peeling preventions arranged in four directions. This is the main material (steel material).

  FIG. 4 is a partial plan view of a strong anchor showing a second embodiment of the peeling preventing method of the present invention, FIG. 4 (a) is a plan view thereof, and FIG. 4 (b) is a sectional view thereof.

  In these drawings, 30 is lining concrete, 31 is a strong anchor, 32 is a support plate fixed with a strong anchor, 33 to 36 are shackles arranged in four directions, and 37 to 40 are anti-fouling materials arranged in four directions. The main material (synthetic fiber).

  In this embodiment, the main structure (steel material) 17-20 of the anti-peeling material in FIG. 3 is the same as that except that the main material (synthetic fibers) 37-40 of the anti-dropping material is replaced.

  FIG. 5 is a partial sectional view of a strong anchor showing a third embodiment of the peeling preventing method of the present invention.

  In this embodiment, 40 is lining concrete, 41 is a peeling prevention net disposed on the surface of the lining concrete 40, 42 is a nonflammable waterproof sheet placed on the peeling prevention net 41, and 43 is a nonflammable waterproof sheet. A support plate 44 provided on 42 is a main material (steel material) of a peeling prevention material fixed to the surface of the lining concrete 40 with a strong anchor 45 via a peeling prevention net 41 and a nonflammable waterproof sheet 42.

  Advantages of the present invention include the following.

  (1) It is possible to prevent collapse of a large scale lump.

  As shown in FIG. 2, in the method for preventing peeling of the lining concrete 1, the peeling prevention material 4 is formed by making at least a part of the peeling prevention material (steel material, high-elasticity precast material, fiber material, etc.) 4 into a pin structure. In this case, no bending moment is generated, and only the axial force 9 acts on the strong anchor 6. With this structure, it is possible to prevent a large exfoliation mass from collapsing even with a small rigidity.

  (2) With the present invention alone, it is possible to prevent collapse from a small exfoliated mass to a large exfoliated mass.

  As shown in FIG. 2, by using at least two or more anti-peeling materials having different anti-peeling strengths, it becomes possible to prevent the exfoliation of different sizes in one step. .

  (3) Compared with the conventional anti-peeling work, the amount of inhibition on the inner air cross section can be suppressed.

  As shown in FIGS. 1 and 2, in the present invention, it is possible to prevent the collapse of a large exfoliation lump even with a small rigidity anti-exfoliation material, so that the amount of hindering the inner air cross section compared with the conventional exfoliation prevention work Less is.

  (4) It has excellent economic efficiency compared to conventional peeling prevention work.

  As shown in FIG. 1 to FIG. 2, when the same kind of reinforcing material is used to expect the same degree of peeling prevention, the amount of reinforcing material used in the present invention is less than that of the conventional inner surface reinforcing method, Excellent economic efficiency.

(5) On-site work amount that is the same as the conventional peeling prevention method The construction method is the same as the conventional method because it is the same as the conventional method.

(6) Groundwater drainage function In the conventional construction method where fiber sheets and panels are attached to the front of the lining, if water leakage occurs along the cracks or joints of the lining, there is a separate treatment method such as water stoppage or water conveyance. Necessary. As shown in FIG. 5, the present invention makes it easy to lay the non-flammable waterproof sheet 42 in accordance with the installation of the main material 44 of the peeling prevention material. Excellent economic efficiency.

  In addition, this invention is not limited to the said Example, Based on the meaning of this invention, a various deformation | transformation is possible and these are not excluded from the scope of the present invention.

  The tunnel lining concrete peeling prevention method and the structure thereof according to the present invention can be used as a construction method for accurately preventing a fall due to peeling of the tunnel lining concrete.

1 is an overall cross-sectional view showing a method for preventing peeling of concrete covering a tunnel according to an embodiment of the present invention. It is explanatory drawing of the peeling prevention mechanism which shows the peeling prevention construction method of the lining concrete of the tunnel which shows the Example of this invention. It is a fragmentary top view of the strong anchor which shows 1st Example of the peeling prevention construction method of this invention. It is a fragmentary top view of the strong anchor which shows 2nd Example of the peeling prevention construction method of this invention. It is a fragmentary sectional view of the strong anchor which shows the 3rd Example of the peeling prevention construction method of this invention. It is whole sectional drawing which shows the peeling prevention method of the lining concrete of the conventional tunnel. It is a figure which shows the peeling prevention mechanism of a conventional construction method.

Explanation of symbols

1,10,30,40 Concrete lining 2 Portions where large-scale collapse may occur 3 Peeling lump 4 Peeling prevention material 5 Peeling prevention installation range 6, 11, 31, 45 Strong anchor 7 Shackle 8 Expansion / contraction Shackle 9 Axial force 12, 32, 43 Support plates 13-16, 33-36 Shackles arranged in four directions 17-20 Anti-fouling materials (steel materials) arranged in four directions
37 to 40 Anti-peeling material (synthetic fiber) placed on all sides
41 Peeling prevention net placed on the surface of lining concrete 42 Nonflammable waterproof sheet placed on the peeling prevention net 44 Peeling prevention material (steel)

Claims (11)

  A tunnel lining concrete peeling prevention method characterized by arranging a peeling prevention material connected via a shackle to a support plate fixed to the lining concrete with an anchor.   2. The method according to claim 1, wherein an expansion and contraction shackle is disposed between the peeling prevention materials connected to the shackle.   3. The method according to claim 1, wherein the shackle is disposed on four sides of the anchor, and a stripping preventing material is disposed on the four sides of the anchor.   4. The method for preventing peeling of tunnel lining concrete according to claim 1, wherein a waterproof sheet is disposed on the surface of the lining concrete.   5. A method for preventing peeling of lining concrete of a tunnel according to claim 1, wherein a net material is disposed on the surface of the lining concrete. (A) a support plate fixed to the lining concrete with an anchor;
(B) a shackle fixed on the support plate;
(C) A peeling prevention structure for lining concrete of a tunnel, comprising a peeling prevention material fixed to the shackle and disposed on the surface of the lining concrete.   The tunnel lining concrete peeling prevention structure according to claim 6, comprising four shackles arranged on four sides of the anchor.   8. The structure for preventing peeling of lining concrete in a tunnel according to claim 6 or 7, wherein the peeling preventing material is a steel material, a highly elastic precast material, or a fiber material. body.   The tunnel covering concrete peeling prevention structure according to claim 6, 7 or 8, further comprising a net member between the covering concrete and the support plate. Structure.   The tunnel covering concrete peeling prevention structure according to claim 6, 7, 8, or 9, further comprising a nonflammable waterproof sheet between the covering concrete and the support plate. Concrete peeling prevention structure.   11. The tunnel lining concrete peeling prevention structure according to claim 6, 7, 8, 9, or 10, wherein the peeling prevention material is a net material.

Images