JPH09303092A - Tunnel lining method by flexible joint and joint member therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a damage such as crack from being caused in a secondary lining of a tunnel by an earthquake or unequal displacement of ground. SOLUTION: A lining segment having a synthetic resin cushioning material layer 3 preliminarily formed on the inner surface side is assembled along an excavated tunnel inside wall surface, whereby a primary lining 1 is constructed. A body piece 51a having substantially the same thickness as the placing thickness of a secondary winding concrete is formed in the center of the back surface of a center 5 used for placing the secondary winding concrete. A synthetic resin joint member 4 formed of a body piece 41 and embedded pieces 42, 43 to be embedded in the secondary winding concrete which are formed on both end part of the body piece 41 is set, and the secondary winding concrete is placed on the back surface of the center 5 is this state to construct a secondary lining 2.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a secondary lining of a tunnel (hereinafter, simply referred to as "tunnel" in the present specification) of a sewer, a railway, a road, or the like due to an earthquake, uneven displacement of the ground, or the like. TECHNICAL FIELD The present invention relates to a tunnel lining method using a flexible joint for preventing the occurrence of damages to a joint, and a joining member thereof.

[0002]

2. Description of the Related Art Conventionally, when constructing a tunnel for a sewer, a railway, a road, or the like, a primary lining is constructed by assembling a lining segment along an inner peripheral wall surface of an excavated tunnel, and then a secondary lining having a predetermined thickness is formed. The secondary lining is constructed by casting rolled concrete.

[0003]

The tunnel constructed in this way is designed to have strength enough to withstand expected earthquakes and unequal displacements of the ground. No critical damage is caused by unequal displacement of the ground or the ground, etc., but because the primary lining and the secondary lining are integrated, dynamic external forces such as earthquakes were applied. If the stress is locally concentrated,
The shear wave causes damage to the secondary lining such as linear cracks along the tunnel axis direction, and the compression wave causes secondary lining, especially the secondary wrapped concrete seam in the secondary lining. In this case, damages such as ring-shaped cracks are generated along the circumferential direction, thereby causing a problem of leaking water and lowering the durability of the tunnel.
Conventionally, in order to prevent water leakage from the joint of the secondary wrapping concrete of the secondary lining, a stop made of a rubber plate or iron plate having a thickness much smaller than the thickness of the secondary wrapping concrete is used at the joint of the secondary wrapping concrete. The installation of a water plate has been proposed and put into practical use, but this water stop plate absorbs the impact force (strain) generated in the secondary rolled concrete when a dynamic external force such as an earthquake is applied. Rather, there is a problem in that the strength of the joint part of the secondary winding concrete provided with the water stop plate is reduced.

The present invention solves the above problems of the conventional tunnel and prevents damage such as cracks from occurring in the secondary lining of the tunnel due to an earthquake or uneven displacement of the ground. It is an object of the present invention to provide a tunnel lining method by flexible joining and a joining member thereof.

[0005]

In order to achieve the above object, a tunnel lining method using a flexible joint according to the present invention comprises a primary lining by assembling a lining segment along an inner peripheral wall surface of an excavated tunnel. In the tunnel lining method of constructing a secondary lining by casting a secondary winding concrete of a predetermined thickness after constructing, a central portion is provided on the back of the centre used for placing the secondary winding concrete. Forming a main body piece having substantially the same thickness as the cast thickness of the secondary rolled concrete, and forming a buried piece buried in the secondary rolled concrete at both ends of the main body piece. In this state, the secondary winding concrete is cast on the back of the center.

On the back surface of the center, a main body piece having a thickness approximately the same as the casting thickness of the secondary winding concrete is formed in the central portion, and embedded pieces embedded in the secondary winding concrete at both ends of the main body piece. By installing a joint member made of synthetic resin forming the, and by placing a secondary winding concrete on the back of the center in this state, a joint member that effectively functions against earthquakes and unequal displacement of the ground, It can be easily and accurately arranged at the joint of the secondary rolled concrete of the secondary lining.

In this case, a primary lining can be constructed by assembling a lining segment in which a synthetic resin buffer layer is formed on the inner surface side in advance along the excavated tunnel inner peripheral wall surface.

[0008] By assembling a lining segment in which a buffer layer made of synthetic resin is formed on the inner surface side in advance, a buffer layer that functions effectively against an earthquake, uneven displacement of the ground, and the like can be combined with the primary lining. It can be easily and accurately arranged during the next lining.

Further, the joining member for tunnel lining according to the present invention is provided with a main body piece which is disposed in the circumferential direction of the secondary rolled concrete and has a thickness substantially equal to the thickness of the secondary rolled concrete in the center. It is characterized in that buried pieces buried in secondary rolled concrete are formed at both ends of the main body piece.

[0010] By forming the central portion of the joining member so as to have substantially the same thickness as the cast thickness of the secondary winding concrete, the secondary winding concrete is surely divided by the joining member in the axial direction of the tunnel. This joint member can absorb the impact force generated when the axial compression and tensile force of the tunnel acting on the primary lining is transmitted to the secondary lining.

In this case, a non-foamed synthetic resin hollow member integrally formed with the embedded pieces formed at both ends of the main body piece, and a foamed synthetic resin filling member filled in the hollow portion of the hollow member are provided. And can be composed of Also, the inner and outer surfaces of the hollow member of the main body piece can be formed in a bellows shape.

As a result, the flexibility of the joining member can be increased while maintaining the strength of the joining member, and the followability to a dynamic external force such as an earthquake can be improved.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a tunnel lining method by flexible bonding and a bonding member thereof according to the present invention will be described below with reference to the drawings.

FIG. 1 shows a tunnel constructed by using a tunnel lining method using a flexible joint according to the present invention. This tunnel is a lining segment 1 assembled along the inner peripheral wall surface of the excavated tunnel by a known shield machine.
0, a primary lining 1, a secondary lining 2 constructed by casting a secondary winding concrete having a predetermined thickness after constructing the primary lining 1, a primary lining 1 and a secondary lining 2 and a synthetic resin joining member 4 arranged in the circumferential direction at the joint of the secondary wrapping concrete of the secondary lining 1. Become.

In this case, as the lining segment 10 used for the primary lining 1, a steel or concrete lining segment in which a synthetic resin cushioning layer 3 is formed in advance on the inner surface side is used. It is desirable. In the case where a steel lining segment is used, as shown in FIG. 2, concrete or the like is provided inside the steel lining segment defined by the main girder 11, the joint plate 12, and the reinforcing ribs 13. With the filler 14 filled, the synthetic resin buffer layer 3 is formed.

The cushioning material layer 3 is made of a synthetic resin material having high durability against shocking external force such as polyethylene, urethane rubber, silicon rubber and the like, and having high elasticity. In the example shown in FIG. 2, the cushioning material layer 3 is formed by attaching a synthetic resin sheet made of polyethylene to the surface of the filler 14 filled in the steel lining segment 10. The method for forming the buffer material layer 3 is not limited to this, and the buffer material layer can be formed by, for example, applying a liquid synthetic resin material to the surface of the filler 14. In the case where the primary lining is constructed by casting primary rolled concrete, for example, by applying a synthetic resin sheet to the inner surface side of the primary lining or applying a liquid synthetic resin material by on-site construction, etc. A buffer material layer can be formed.

As shown in detail in FIG. 3, the joining member 4 has a main body piece 41 having a thickness substantially equal to the thickness of the secondary rolled concrete formed at the center, and is formed at both ends of the main body piece 41. Buried piece 4 buried in secondary rolled concrete
2, 43 are formed. Of these, the main body piece 41
Is a highly foamable non-foamed synthetic resin that has high durability against shocking external forces such as polyethylene, urethane rubber, and silicone rubber formed integrally with the embedded pieces 42 and 43 formed at both ends. It is desirable that the hollow member 41a be made of a material, and a filling member 41b made of a highly elastic foam synthetic resin material such as urethane foam rubber or foamed silicone rubber filled in the hollow portion of the hollow member 41a. . In addition, the inner and outer surfaces of the hollow member 41a are formed in a bellows shape so that the hollow member 41a has a stretchable structure, and the hollow member 41a is formed in a bellows shape.
At least a portion of the outer surface of the outer surface where there is a possibility that the concrete may enter when the secondary rolled concrete is poured is filled with a highly elastic foam synthetic resin material such as urethane foam rubber or silicone rubber foam. It is desirable to form 41c. In this case,
When the use of the tunnel to be constructed is for sewerage, the hollow member 41 constitutes a part of the inner peripheral wall surface of the tunnel.
A filling layer 41c is formed on the outer surface inside a so that the inner peripheral wall surface of the tunnel becomes smooth. In addition, buried piece 4
The ridges 42a, 43a are integrally formed on the embedment pieces 42, 43 in order to increase the adhesive force between the buried pieces 42, 43 and the secondary winding concrete.

Next, the steps of the tunnel lining method by the flexible bonding according to the present invention will be described. First, the primary lining 1 is constructed by assembling the lining segment 10 in which the buffer layer 3 made of a synthetic resin is formed on the inner surface side in advance along the excavated tunnel inner peripheral wall surface by the shield machine. In this case, if necessary, a gap between the cushioning material layers 3 between the adjacent lining segments 10 is provided.
By applying or injecting a liquid synthetic resin material of the same kind or different kind from the synthetic resin material constituting the above, the gap can be sealed and the buffer material layer 3 can also have a water stopping effect. Next, the secondary lining 2 is constructed by casting a secondary winding concrete having a predetermined thickness. At this time, as shown in FIG. 4, a center 5 used for casting the secondary winding concrete is used. A joining member 4 made of a synthetic resin is installed along the end form 51 on the back surface of the center, and in this state, a secondary winding concrete is cast on the back surface of the center 5. In this case, the filling material 52 is arranged between the end mold 51 of the center 5 and the joining member 4 and between the primary lining 1 and the joining member 4, and the pressure applied to the joining member 4 at the time of placing the secondary winding concrete. And prevents concrete from entering the position of the hollow member 41a of the joining member 4 when the secondary winding concrete is poured. In addition, the joining member 4 arranged along the wife formwork 51 of the center 5 and the secondary lining 2 ′ constructed in the previous process.
The distance from the joining member 4 'arranged at the end of the second winding concrete is adjusted by adjusting the length of one casting step of the secondary winding concrete.
It can be changed as appropriate.

[0019]

EFFECTS OF THE INVENTION According to the tunnel lining method by flexible joining of the present invention, a joining member that effectively functions against earthquakes, unequal displacement of the ground, etc. The joint can be easily and highly accurately arranged. In the tunnel constructed in this way, since the secondary winding concrete is reliably divided in the axial direction of the tunnel by the joining member, the axial compression and tensile force of the tunnel acting on the primary lining is reduced by the secondary force. It can absorb the impact force generated when transmitted to the lining, and damage such as ring-shaped cracks along the circumferential direction of the tunnel occurs at the joint of the secondary wound concrete of the secondary lining Can be effectively prevented, and a highly watertight tunnel can be constructed by the water stopping effect of the joint member itself.

Further, by assembling a lining segment in which a buffer layer made of a synthetic resin is previously formed on the inner surface side,
A buffer layer that functions effectively against an earthquake, unequal displacement of the ground, or the like can be easily and accurately arranged between the primary lining and the secondary lining. Then, the tunnel constructed in this way, the primary lining and the secondary lining are reliably separated by the cushioning material layer, and the bending generated in the cross section of the tunnel of the secondary lining in the direction perpendicular to the axial direction. It can absorb the tensile force, effectively prevent the linear lining from being damaged along the axial direction of the tunnel in the secondary lining. High tunnels can be built.

Further, a non-foamed synthetic resin hollow member integrally formed with the embedded pieces formed at both ends of the main body piece of the joining member, and a foamed synthetic resin filling member filled in the hollow portion of the hollow member are provided. Or by forming the inner and outer surfaces of the hollow member of the main body piece in a bellows shape, while maintaining the strength of the joining member, increasing the flexibility, and thereby following the dynamic external force such as an earthquake. High joining member can be obtained.

[Brief description of drawings]

FIG. 1 shows an example of the structure of a tunnel constructed by using a tunnel lining method by a flexible junction according to the present invention, wherein (a) is a longitudinal sectional view of the tunnel, and (b) is an AA of (a). It is a line sectional view.

FIG. 2 is a perspective view showing an example of a lining segment used in a tunnel lining method by a flexible joint according to the present invention.

FIG. 3 is a cross-sectional view showing an example of a joining member for tunnel lining according to the present invention.

FIG. 4 is a process explanatory view of a tunnel lining method by flexible bonding according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Primary lining 2 Secondary lining 3 Buffer material layer 4 Joining member 41 Main body piece 41a Hollow member 41b Filling member 41c Filling layer 42 Buried piece 43 Buried piece 5 centrelle 10 Lining segment

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Hiroshi Yoshimura 4-55, Konohana-ku, Osaka-shi, Osaka-shi, Konoike-gumi Co., Ltd. (72) Ishinobu Kisa 4--3-55, Konohana-ku, Osaka, Osaka No. Konoike Gumi Co., Ltd.

Claims (5)

[Claims] 1. A primary lining is constructed by assembling a lining segment along an excavated inner wall surface of a tunnel, and a secondary lining is constructed by casting a secondary rolled concrete having a predetermined thickness. In the tunnel lining method, a main body piece having a thickness substantially equal to the thickness of the secondary rolled concrete is formed at the center on the back surface of the centre used to cast the secondary rolled concrete. A joint member made of synthetic resin having a buried piece buried in the secondary rolled concrete is installed at both ends of the piece, and in this state, the secondary rolled concrete is cast on the back of the center. Tunnel lining method by flexible bonding. 2. A primary lining is constructed by assembling a lining segment in which a synthetic resin buffer layer is formed on the inner surface side in advance along the excavated tunnel inner peripheral wall surface. The tunnel lining method according to claim 1, wherein the tunnel lining method is used. 3. A main body piece which is disposed in the circumferential direction of the secondary rolled concrete and has a thickness substantially equal to the thickness of the secondary rolled concrete at the center portion, and is formed at both ends of the main body piece. A joining member for tunnel lining, wherein a buried piece buried in secondary rolled concrete is formed. 4. A main body piece comprising a non-foamed synthetic resin hollow member integrally formed with buried pieces formed at both ends, and a foamed synthetic resin filling member filled in a hollow portion of the hollow member. The joining member for tunnel lining according to claim 3, wherein the joining member is formed. 5. The joining member for tunnel lining according to claim 4, wherein the inner and outer surfaces of the hollow member of the main body piece are formed in a bellows shape.