JP5141646B2 - Composite segment and tunnel lining - Google Patents

Description

  The present invention relates to composite segments and tunnel linings used in the construction of tunnels.

  Conventionally, techniques such as the following (1) and (2) are known as synthetic segments.

  (1) In the composite segment for tunnel lining composed of steel and concrete, the joint plate that spans the four sides of the tunnel's natural ground side and inner space side and both sides in the circumferential direction (main girder surface), that is, between the main girder. This is a four-sided steel shell composite segment filled with concrete using steel plates for the main and inner sides and each main girder. At the same time, a four-surface steel shell composite segment having a configuration in which the tip portions of the upper and lower stud dowels are provided so as to overlap each other in the tunnel radial direction is known (for example, see Patent Document 1).

  (2) In the tunnel lining composite segment composed of steel and concrete, steel plates with stud gibels are used on both the natural ground side and the inner air side, and the top and bottom stud gibels are connected to each other at the tunnel radius. It is provided so as to overlap in the direction, both ends of the steel plate in the circumferential direction of the tunnel are bent to provide a bent portion as a joint surface, concrete is placed between both steel plates, and the steel plate and concrete are integrated by the stud gibber. Synthetic segments are also known (see, for example, Patent Document 2).

JP-A-3-286097 JP-A-3-59300

In the case of (1), since there is no joint plate, the stopper is disposed on the steel plate on the natural ground side (skin plate) and the steel plate on the inner air side (skin plate) at intervals in the tunnel circumferential direction. In addition, they are arranged at intervals in the tunnel axis direction. In this segment, there is no joint plate at both ends of the tunnel circumferential direction, so the integrity of the steel shell and the filled concrete is poor, and the stud gibber provided on the steel plate on the natural ground side and the stud provided on the steel plate on the inner air side Since the tip portions of the dowels are provided so as to overlap each other in the tunnel radial direction, the number of stud dowels installed is significantly increased. Therefore, there is a problem that it takes time to install the stud gibber, the installation work cost is high, and the synthetic segment manufacturing cost is high.
In the case of the above (2), since the main girder is not provided other than the high boiling point of the construction cost by the stud gibber, the cross-sectional performance is lowered. If the segment thickness is increased in order to cover the deterioration of the cross-sectional performance, there is a problem that the manufacturing cost of the segment increases and the construction cost of the tunnel increases.
Further, in the case of (2), since the joint plate is bent, the concrete sealing effect is extremely low, and it is necessary to arrange a large number of slip stoppers, resulting in a problem that the manufacturing cost of the segment is increased.
In addition, the conventional stud dowels of (1) and (2) above are a slip-preventing member for filling concrete and adhere between the filling concrete and the steel plate on the natural ground side, or with the steel plate on the inside air side. In addition, the steel plate on the natural ground side and the steel plate on the inner air side are members that ensure integration through intermediate filling concrete and stud gibber, so that the stud gibber fixed to the natural steel plate is used. The stud heads installed on the inner space side are arranged so as to overlap each other in the tunnel radial direction. By arranging the head of the stud gibber in this way, the padded concrete is sandwiched between the heads of the stud gibber adjacent in the tunnel radial direction, and the steel plate on the natural ground side and the steel plate on the inner air side are placed in the tunnel radial direction. It also has a function of resisting the force to be separated by acting to compress the filling concrete between the heads in the tunnel radial direction. Therefore, in the tunnel radial direction, the stud diver has a height dimension of about 2/3 of the height of the composite segment in the tunnel radial direction.
In view of the problems of the prior art as described above, a composite segment that satisfies the following (1), (2), and (3) is desired.
(1) A synthetic segment that can reduce the manufacturing cost of the segment by minimizing the stoppers placed on the inner surface of the steel shell. (2) The segment thickness is maximized by increasing the cross-sectional performance of the segment. A synthetic segment that can reduce the thickness and reduce the tunnel construction cost is desired.
(3) In order to reduce the cost of the composite segment in the form of providing the stud gibber, it is most preferable to reduce the number of gibber as much as possible, and it is most preferable if the gibber as a detent member can be eliminated.
As a result of various studies in order to satisfy the demands of (1) to (3), at least two main girders located at both ends in the tunnel axial direction and two joints respectively disposed at both ends in the tunnel circumferential direction By making a steel shell in which a plate and a steel plate provided on either or both of the natural mountain side and the inner space side are rigidly connected, that is, a five-sided steel shell, preferably a six-sided steel shell, The steel plate (skin plate) provided on at least two main girders and either or both of the natural ground side and the inner air side is rigidly coupled by welding. For this reason, it has been found that three sides, preferably four sides, of each joint plate are securely fixed, and that each joint plate can ensure the function of preventing misalignment of the filled concrete.
In the above case, the steel plate on the natural ground side and the steel plate on the inner air side are made of steel having a thickness equivalent to that of the main girder, so that the steel plate on the natural mountain side and the steel plate on the inner air side function as a structural material. It has also been found that a five-sided steel shell, preferably a six-sided steel shell, is good. In addition, the joint plate in that case can ensure the function of preventing slippage of the filling concrete, so that when the composite segment is manufactured, the filling of the filling concrete and the steel plate on the ground side or the steel plate on the inside air side It has been found that a member that reliably ensures the design can be designed without expecting a function of preventing the displacement in the circumferential direction of the tunnel other than the adhesion in the radial direction of the tunnel with the filling concrete.
As described above, it is divided into the function of preventing the displacement by the joint plate, and the adhesion between the steel plate on the natural ground side or the steel plate on the inner air side and the filling concrete, and the minimum adhering material necessary for the adhering (that is, the fixing material) By changing the design philosophy of the composite segment, the design philosophy can be simplified, and the thickness of the composite segment in the tunnel radial direction can be reduced. For example, the tunnel excavation radius can be reduced. We found that it would be an economical and reasonable composite segment.
The present invention advantageously eliminates the above-described conventional problems, and exhibits a function of preventing slippage by a joint plate and a fixing function by a fixing material for adhering a ground-side steel plate or an inner-side steel plate to intermediate-filled concrete. The aim is to provide a reasonable and economical composite segment and tunnel lining that is possible.

In order to solve the above-mentioned problem advantageously, in the composite segment of the first invention, at least two main girders, two joint plates respectively disposed at both ends in the circumferential direction of the tunnel, A synthetic segment formed by filling concrete inside a steel shell having a steel plate provided on either one or both of the empty sides, wherein the steel plate is on the inner side of the steel shell, or on the ground side or the inner side of the steel plate. Either one or both of these are provided with independent fixing materials spaced apart in the tunnel circumferential direction and tunnel axial direction, and the tunnel circumferential distance is set closer and narrower than the tunnel axial direction. A circumferential fixing material row is formed, and the tunnel axial direction spacing between adjacent tunnel circumferential fixing material rows in the tunnel axial direction is wider than the spacing between the tunnel circumferential fixing materials. The joint plate is continuous in all lines where the joint plate and the steel plate provided on one or both of the natural mountain side and the inner air side and the at least two main girders are adjacently butted together It is characterized by being rigidly connected by welding. In the composite segment of the second invention, at least two main girders, two joint plates respectively disposed at both end portions in the circumferential direction of the tunnel, and a steel plate provided on either the natural ground side or the inner space side A synthetic segment formed by filling concrete inside the steel shell, and tunneling an independent fixing material on either the ground side or the inner air side of the steel plate on the inner surface of the steel shell. Installed at intervals in the circumferential direction and the tunnel axis direction, and the tunnel circumferential direction interval is narrower than the tunnel axis direction to form a tunnel circumferential direction fixing material row, and adjacent to the tunnel axis direction. The tunnel circumferential direction fixing material row is arranged so that the interval in the tunnel axis direction is wider and sparser than the interval between the tunnel circumferential direction fixing materials, and the joint plate is connected to the joint plate and the ground or inner space side. Characterized in that the steel sheet and the at least two main girders provided on the deviation or the other is rigidly connected by continuous welding in the whole line to be butted adjacent. In the composite segment of the third invention, at least two main girders, two joint plates respectively disposed at both ends in the circumferential direction of the tunnel, and steel plates provided on both the natural ground side and the inner air side A synthetic segment formed by filling concrete inside a steel shell having an independent fixing material on both the ground side and the inner air side of the steel plate on the inner surface of the steel shell. Installed at intervals in the axial direction, and at intervals closer to the tunnel circumferential direction than the tunnel axial direction, the tunnel circumferential direction fixing material row is formed, and the tunnel circumferential direction fixing adjacent to the tunnel axial direction The interval in the tunnel axis direction of the material rows is arranged to be wider and sparser than the interval between the fixing materials in the tunnel circumferential direction, and the joint plate is provided on both the natural ground side or the inner space side and the steel plate Without even and the two main girders, characterized in that it is rigidly connected in succession in the whole line adjacent.
In the fourth invention, in the composite segment of any one of the first invention to the third invention, the virtual cone breaking surface by the fixing material installed at intervals in the tunnel circumferential direction is continuously connected in the tunnel circumferential direction. It is characterized by being.
According to a fifth invention, in the composite segment of any one of the first invention to the fourth invention, the main girder section is an I-shaped, L-shaped or U-shaped section provided with a flange and a web.
In the sixth invention, in the synthetic segment of any one of the first invention to the fifth invention, the fixing material is any one of a stud gibber with head, a T-shaped steel material, a U-shaped steel material, and an L-shaped steel material. Features.
The tunnel structure of the seventh invention is characterized in that the composite segment according to any one of claims 1 to 6 is used for tunnel lining.

According to the first to third inventions, an independent fixing material is placed on the inner surface of one or both of the steel plate on the natural ground side and the steel plate on the inner air side, and the distance between them in the tunnel circumferential direction and the tunnel axial direction. The tunnel circumferential direction fixing material row is formed by setting the distance in the tunnel circumferential direction narrower than the tunnel axial direction to form the tunnel circumferential direction fixing material row, and the tunnel axial direction of the tunnel circumferential direction fixing material row adjacent to the tunnel axis direction. The gap between the fixing materials in the circumferential direction of the tunnel is arranged so as to be sparser than the fixing material in the tunnel circumferential direction. When the transmission load in the circumferential direction of the tunnel is applied when soil pressure load is applied, the steel plate on the natural ground side or the steel plate on the inner air side can prevent skin separation from the filled concrete. , The effect of such can increase the synthesis integration of medium filling the concrete is obtained.
Further, a steel shell having at least two main girders, two joint plates respectively disposed at both ends in the circumferential direction of the tunnel, and a steel plate provided on one or both of the natural ground side and the inner air side Since the fixing material is provided on one or both of the steel plate on the natural ground side and the steel plate on the inner air side, the effect that the synthetic segment can be manufactured at low cost is obtained.
In addition, the fixing material may be arranged densely in the tunnel circumferential direction compared to the tunnel axis direction, and in the tunnel circumferential direction, the fixing material may be arranged widely and sparsely compared with the arrangement interval in the tunnel circumferential direction. Can be reduced as compared with the case of densely arranging the whole, and effects such as easy production of the composite segment can be obtained.
In addition, the fixing material has an arrangement structure of discrete fixing materials spaced apart in the tunnel circumferential direction and tunnel axial direction, so it is excellent in filling properties of filling concrete and forms homogeneous filling concrete. Can improve the quality of the composite segment. Conventionally, a structure that prevents misalignment by punching a steel plate continuous in the circumferential direction of the tunnel, and a structure that prevents misalignment by similarly processing and shaping a rod-shaped steel material in a spiral shape, are known. In any case, when filling concrete, a concrete filling failure is caused at a part of the stopper that is continuous in the circumferential direction of the tunnel. That is, the concrete is blocked at the above-mentioned site, and bubbles are accumulated, causing problems such as void filling failure and accumulation of concrete impurities, and the present invention can eliminate such problems.
In addition, the fixing member provided on the ground steel plate and / or the inner steel plate is also made up of the minimum necessary fixing material arrangement structure by eliminating the slip prevention member used in the conventional composite segment. Segment manufacturing costs can be reduced.
In addition, the function of preventing the separation of the steel plate on the natural ground side and / or the steel plate on the inner air side by adhesion with the filling concrete through the fixing material and the function of preventing the slippage of the filling concrete by the joint plate are separated. It is possible to make a rational design, and the cross-sectional performance of the composite segment is maximized by the rational design, and the thickness of the segment in the radial direction of the tunnel is reduced to reduce the construction cost of the tunnel lining structure. The effect that it can aim at is acquired.
In particular, in the case of the present invention, since it is possible to obtain a fixing structure with a minimum necessary fixing material spaced in the circumferential direction of the tunnel, effects such as reduction in the manufacturing cost of the composite segment can be obtained.
In addition to the simple structure in which the fixing material is provided on the steel plate on the natural ground side and / or the steel plate on the inside air side, the adhesion to the filling concrete is ensured, and the sectional performance of the segment is improved with a simple structure. It can be an inexpensive synthetic segment.
In particular, in a six-faced steel shell having at least two main girders, two joint plates respectively disposed at both ends of the tunnel circumferential direction, and steel plates on both the ground and inner sides, each joint plate is The four sides are fixed by welding with the main girder on both sides in the tunnel axial direction, the steel plate on the inner side in the tunnel radial direction and the steel plate on the natural ground side, and the segment has a sealed box steel shell structure, and the joint plate is sealed This is a sealed joint plate structure used in a box-type structure of a mold. When an external force of earth and water pressure is applied to the tunnel, a force is generated in the segment piece in the tunnel circumferential direction, but the steel shell and the stuffed concrete have different member rigidity, and therefore the amount of expansion and contraction in the tunnel circumferential direction differs. As a result, the steel shell and the filled concrete behave differently, and the original steel shell and concrete cannot behave as a unit. Therefore, joint plates are provided at both ends of the segment piece in the circumferential direction of the tunnel, and the main girder and the ground and steel plates are continuously rigidly connected by welding. Are completely restrained. The effect of preventing the slippage of the joint plate against the filling concrete is large, and the composite structure is surely achieved, and the performance of the composite segment is enhanced. Therefore, since the segment girder height can be reduced, this can provide effects such as reducing the tunnel outer diameter, reducing the size and weight of the segment, and reducing tunnel construction costs.
According to the fourth aspect of the present invention, since the virtual cone fracture surface by the fixing material installed at intervals in the circumferential direction of the tunnel is connected in the circumferential direction of the tunnel and is continuous, A stiffening line (stiffening region) where the virtual cone fracture surface is continuous in the circumferential direction of the tunnel can be formed on the steel plate by simple means, and reliably resists the transmission force in the circumferential direction of the tunnel. Can be prevented, and a composite structure with the filling concrete can be achieved.
According to the fifth invention, the main girder cross section is an I-shaped, L-shaped or U-shaped cross section having a flange and a web, so that the rigidity of the main girder is increased as compared with the case of the plate-shaped main girder. In addition, it is possible to obtain an effect that a synthetic segment that is easy to manufacture and inexpensive can be obtained by using a main girder assembled from commercially available steel plates or a main girder of shape steel.
According to the sixth invention, since the fixing material is any one of a head stud stud, a T-shaped steel material, a U-shaped steel material, and an L-shaped steel material, using a simple-shaped fixing material, By producing a good steel shell, it is possible to produce a composite segment in which the concrete is uniform and homogeneous.
According to the seventh invention, since the composite segment according to any one of the first invention to the sixth invention is a tunnel lining used in the tunnel lining structure, even when an earth pressure load is applied, In addition, a tunnel lining structure capable of preventing skin separation from the inside-filled concrete on the inner air side can be obtained, and effects such as the construction of a rational and economical tunnel structure with a thin wall can be obtained.

It is a partially cutaway perspective view which shows the synthetic | combination segment of 1st Embodiment of this invention. It is a vertical side view of the synthetic segment shown in FIG. It is a vertical front view of the synthetic segment shown in FIG. Partial front view It is explanatory drawing for demonstrating the position in the case of providing a fixing material in the steel plate of a natural ground side, or the steel plate of an inner side. It is explanatory drawing which shows an example of the space | interval and arrangement | sequence in the case of providing a fixing material in the steel plate of a natural ground side, or the steel plate of an inner side. It is explanatory drawing which shows the other example of the space | interval and arrangement | sequence in the case of providing a fixing material in the steel plate of a natural ground side, or the steel plate of the inner side. (A) (b) (c) is explanatory drawing for demonstrating the effect | action of a fixing material. It is a partially notched perspective view which shows the synthetic | combination segment of 2nd Embodiment of this invention. It is a vertical side view of the synthetic segment shown in FIG. It is a vertical front view of the synthetic segment shown in FIG. It is a partially notched perspective view which shows the synthetic | combination segment of 3rd Embodiment of this invention. It is a vertical side view of the synthetic segment shown in FIG. It is a vertical front view of the synthetic segment shown in FIG. FIG. 10 is a longitudinal side view showing a fourth embodiment in which a fixing material connecting member for connecting fixing materials to each other in a circumferential direction is provided. It is a vertical front view of the synthetic segment of 4th Embodiment shown in FIG. It is a partially notched perspective view which shows the synthetic | combination segment of 5th Embodiment of this invention. It is a vertical side view of the synthetic segment shown in FIG. It is a vertical front view of the synthetic segment shown in FIG. (A) And (b) shows the other cross-sectional form of the main beam, (a) is a vertical front view of the synthetic segment of 6th Embodiment, (b) is the synthetic | combination segment of 7th Embodiment. It is a vertical front view. (A) And (b) shows the other cross-sectional form of the main beam, (a) is a vertical front view of the synthetic segment of 8th Embodiment, (b) is the synthetic | combination segment of 9th Embodiment. It is a vertical front view. (A) And (b) shows the other cross-sectional form of a main girder, (a) is a vertical front view of the synthetic segment of 10th Embodiment, (b) is the synthetic | combination segment of 11th Embodiment. It is a vertical front view. (A) And (b) shows the other cross-sectional form of a main girder, (a) is a vertical front view of the synthetic segment of 12th Embodiment, (b) is the synthetic segment of 13th Embodiment. It is a vertical front view. It is a partially notched perspective view which shows the synthetic | combination segment of a comparative example. It is a vertical front view of the synthetic segment of the comparative example shown in FIG. It is a vertical side view of the steel plate of the natural ground side in the synthetic segment of the comparative example shown in FIG. It is a partially notched perspective view which shows the synthetic | combination segment of 13th Embodiment of this invention. It is a vertical side view of the synthetic segment shown in FIG. It is a vertical front view of the synthetic segment shown in FIG. It is a front view which shows the tunnel structure using the synthetic segment of this invention.

    Next, the present invention will be described in detail based on the illustrated embodiment.

  1 to 6 show a synthetic segment 1 according to the first embodiment of the present invention. 1 is a partially cutaway perspective view of the synthetic segment 1, FIG. 2 is a longitudinal side view of the synthetic segment shown in FIG. 1, FIG. 3 is a longitudinal front view of the synthetic segment 1 shown in FIG. 1, and FIG. 2 is an explanatory diagram for explaining a position when a fixing material 4 is provided on a steel plate 3 on the inner side or the inner space side. FIG. FIG. 5 and FIG. 6 are explanatory views showing an example of the spacing and arrangement when the fixing material is provided on the steel plate on the natural ground side or the steel plate on the inner air side, and another example.

  The steel shell 5 in the composite segment 1 of the present invention includes at least two steel main girders 6, two steel joint plates 7 respectively disposed at both ends in the circumferential direction of the tunnel, and a natural mountain side or an inner side. The steel shell 5 has a steel plate 2 (3) provided on either one or both of the empty sides.

  There may be three or more main beams 6 at intervals in the tunnel axis direction, but at least two main beams 6 are required. Although not shown, when using three or more main girders, for example, two main girders located at both ends in the tunnel axis direction and arranged to extend in the tunnel circumferential direction, and these One or more middle main girders are arranged between the main girders and extend in the circumferential direction of the tunnel.

Each main girder 6 is integrally joined to each joint plate 7 disposed at both ends in the circumferential direction of the tunnel by welding W, and the steel plate 2 is disposed on either or both of the natural ground side and the inner air side. (3) is fixed to the main girders 6 and the joint plates 7 by welding W and integrated.
In the embodiment shown in FIG. 1, a steel plate 2 on the natural ground side and a steel plate 3 on the internal air side are disposed on both the natural ground side and the inner sky side, respectively, and tunnels between the main girders 6 and the joint plates 7 are provided. It is fixed to the end face on the ground side in the radial direction by welding W, and is fixed to the inner end side in the tunnel radial direction of the main girder 6 and each joint plate 7 by welding W to be integrated. The welding W is continuous welding in the tunnel circumferential direction or tunnel axial direction. Weld W is by fillet welding or full penetration welding.

  The steel rectangular joint plates 7 disposed at both ends in the tunnel circumferential direction are provided with three or four edge portions (the entire continuous edge in the tunnel circumferential direction on the ground side in the tunnel radial direction and both ends in the tunnel axial direction). The entire end of the main girder 6 (the continuous edge in the tunnel radial direction at both ends in the tunnel circumferential direction) and the end of the steel plate 2 on the ground side (the tunnel axis at both ends in the tunnel circumferential direction) (Continuous edge in the direction) and the entire line to be welded is fixed by being rigidly connected by continuous welding W, or continuous to the end of the main beam 6 and the end of the inner steel plate 3 It is fixed by rigid connection by welding W, or fixed by rigid connection by continuous welding W to the end of the main girder 6, the steel plate 2 on the natural ground side, and the end of the steel plate 3 on the inner space side. That is, the joint plate 7 includes three or four sides of the joint plate 7, the steel plates 2 and 3 provided on one or both of the natural mountain side and the inner air side, and the at least two main girders 6. The joint plate 7 is firmly fixed by being welded by the continuous welding at the welded portion (the whole weld line). Therefore, in the present invention, the joint plate 7 at both ends in the circumferential direction of the tunnel is allowed to exhibit a function as an anti-displacement member so that the filled concrete 10 that is filled in does not shift in the circumferential direction of the tunnel. Can do.

By the way, as shown in FIG. 23 to FIG. 25, in particular, as shown in FIG. 25, when the earth and water pressure load F acts on the arcuate synthetic segment 40 that generally forms the tunnel segment ring in a circular shape, it acts on the tunnel segment ring. The transmission force T flows in the tunnel circumferential direction. At that time, a forward bending moment (a bending moment in a direction in which a tensile force is applied to the inner side of the tunnel and a compressive force is applied to the natural ground side. Bending in the opposite direction. There is a composite segment 40 where M acts (moment is called negative bending moment). In the synthetic segment 40 of such a part, the steel plate 2 on the natural ground side or the steel plate 3 on the inner air side is deformed out of plane in the normal direction of the tunnel segment ring, and tends to be separated from the filling concrete 10.
For example, when compressive force P3 in the tunnel circumferential direction acts on the steel plate 2 on the natural ground side of the composite segment 40 of the comparative example shown in FIG. 25, the adhesion between the steel plate 2 on the natural mountain side and the filling concrete 10 is insufficient. Then, the steel plate 2 on the natural ground side undergoes a convex out-of-plane deformation 8 on the natural ground side as shown by a solid line, peels off from the concrete stuffed concrete 10, and the steel plate 2 (3) and the concrete stuffed concrete 10 adhere together. It becomes impossible to exhibit high rigidity as a synthesized segment.
Further, when a tensile force S in the tunnel circumferential direction is applied to the inner steel plate 3 in the composite segment 40, if the inner steel plate 3 and the intermediate concrete 10 are not sufficiently adhered, the inner air side As shown by the solid line, the steel plate 3 undergoes an out-of-plane deformation 9 that is close to a linear shape on the inner side, peels off from the intermediate concrete 10, and the steel plate 3 (2) and the intermediate concrete 10 are separated. It becomes impossible to exhibit high rigidity as an integrated synthetic segment.

  In the present invention, the steel plate 2 on the natural ground side and the filling concrete 10 are securely attached and integrated so that the peeling force can be sufficiently resisted, or the inner steel plate 3 and the filling concrete 10 are reliably attached. In order to attach and integrate so that it can sufficiently resist the peeling force, an independent fixing material is provided on the inner surface of either the steel plate 2 on the natural ground side or the steel plate 3 on the inner air side or both of the steel plates 2 and 3. 4 is arranged with the gap G1 between the fixing materials 4 adjacent to each other in the tunnel circumferential direction being densely arranged, and the plurality of fixing materials 4 form the tunnel circumferential direction fixing material row 11.

  Furthermore, the distance G in the tunnel axis direction between the fixing materials 4 in the tunnel circumferential direction (or the tunnel circumferential direction fixing material row 11) adjacent in the tunnel axis direction is set as the fixing material 4 adjacent in the tunnel circumferential direction (or in the tunnel circumferential direction fixing). The composite segment 1 is wider than the gap G1 of the material row 11) and is arranged sparser in the tunnel axis direction than the gap G1 arranged in the tunnel circumferential direction.

The technical idea based on the present invention is that the anti-slipping function by the non-slip member provided in the conventional synthetic segment is based on the joint plate 7 in the steel shell 5 which is a five-sided steel shell or a six-sided steel shell. The minimum fixing material 4 is provided for the purpose of protecting the skin from the inside-filled concrete 10 of the steel plate 2 on the natural ground side and / or the steel plate 3 on the inner air side, which is surely secured by the sealing effect of the packed concrete 10. The distinction between the function of preventing slippage with the filling concrete 10 and the function of protecting against skin separation with the filling of concrete 10 is clarified. By providing 4, the installation of the slip prevention member is omitted, and the cost reduction of the composite segment 1 is achieved by installing the necessary number of fixing materials 4.
Therefore, the main girder 6, the joint plate 7, the steel plate 2 on the natural ground side, and the steel plate 3 on the inner space side are not provided with a detent member except for the fixing material 4. Also, the fixing material 4 provided on the steel plate 2 on the natural ground side and / or the steel plate 3 on the inner air side is not expected to have a function of preventing slippage, and is installed exclusively to exhibit the function of preventing skin separation. Yes. The length of the fixing material 4 in the tunnel radial direction is set by design, but a shorter one is more economical. For example, the segment thickness dimension in the tunnel radial direction is ½ to 1 of the width dimension of the main beam 6. / 3, or 1/3 to 1/4, the fixing member 4 fixed to the steel plate 2 on the natural ground side and the fixing material 4 fixed to the inner steel plate 3 do not interfere with each other. 5 is easy to manufacture, and the cost can be reduced.

In the form shown in FIG. 1 to FIG. 4, the tunnel circumferential direction is formed on the inner surface of the steel shell 5 that is the inner side of the tunnel radial direction of the steel plate 2 on the natural ground side or the outer radial side of the steel plate 3 on the inner air side. The fixing material 4 made of a stud gibber having a flange 28 protruding in the circumferential direction of the tunnel at the head is fixed by welding and aligned at a certain distance in the circumferential direction of the tunnel as shown in FIG. The arranged tunnel circumferential direction fixing material row 11 is formed. In the tunnel axis direction, two or three tunnel circumferential direction fixing material rows 11 having the same phase are formed. The number of rows in the tunnel circumferential direction fixing material row 11 is appropriately increased when the segment width in the tunnel axis direction increases.
As shown in FIG. 6, the fixing material 4 is arranged in the tunnel circumferential direction so that, for example, the tunnel circumferential direction fixing material row 11 whose phase is shifted by a half pitch is arranged in the tunnel axial direction. A staggered arrangement may be used.
When the fixing material 4 destroys the filling concrete 10 and escapes in the tunnel radial direction, the cone is destroyed, but when the cone is broken, a cone breaking surface is generated. In the present invention, a virtual fracture surface 12 is assumed to be a virtual fracture surface assuming that the cone fracture surface is generated (see FIG. 7).
In the tunnel circumferential direction fixing material row 11, the fixing materials 4 may be arranged in a staggered manner in the tunnel circumferential direction. However, a virtual cone breaking surface (or virtual cone breaking region) 12 is compared with a case where the fixing materials 4 are aligned. In that point, the number of fixing materials increases, which is not economical.
As shown in FIG. 7A, the arrangement interval of the fixing material 4 in the tunnel circumferential direction is such that the virtual cone breaking surface (or virtual cone breaking region) 12 of the fixing material 4 adjacent in the tunnel circumferential direction is tunneled. Overlapping in the circumferential direction (or although not shown, the virtual cone breaking regions 12 are in contact with each other), the virtual cone breaking surfaces 12 are connected in the tunnel circumferential direction and are continuous. In this way, the virtual cone fracture surfaces (or virtual cone fracture regions) 12 of the adjacent fixing materials 4 overlap (or contact each other) in the tunnel circumferential direction, and are connected in the tunnel circumferential direction to be connected to the tunnel circumference. By being continuous in the direction, adhesion and integration between the steel plate 2 on the ground side in the circumferential direction of the tunnel and the filling concrete 10 and adhesion and integration between the steel plate 3 on the inner side and the filling concrete 10 are enhanced. Yes.

In the present invention, the fixing material 4 is provided intermittently at intervals in the tunnel circumferential direction or the tunnel axis direction in the segment, and the filling property of the filling concrete 10 over the entire inside of the steel shell is good. The inside-filled concrete 10 to be filled in can be reliably filled, and a homogeneous filled-in concrete 10 can be formed, so that the quality of the synthetic segment is improved.
Conventionally, in the composite segment, it is also known that reinforcing ribs having a L-shaped cross section continuous in the tunnel axis direction are provided between the main girders. However, the reinforcing ribs also function as partition plates when filling concrete. There is also a possibility that if it is simply filled, there is a possibility that a gap will be formed in the corner of the L-shaped reinforcing rib or in the vicinity of the joint with the steel plate on the natural ground side or on the inside air side. Equipment and skill are required. However, in the case of the present invention, since it is not necessary to arrange such reinforcing ribs, it is possible to reliably fill the concrete without requiring skill with simple equipment, and furthermore, the quality of the filled concrete 10 can be improved. , Improve the quality of the composite segment.
Moreover, adhesion integration of the steel plate 2 on the natural ground side or the steel plate 3 on the inner air side and the filling concrete 10 can be reliably achieved.

More specifically, in the embodiments described above and below, the following actions (1) and (2) are exhibited.
(1) Concrete sealing effect by joint plate The composite segment 1 of the present invention includes two main girders 6, a steel plate 2 on the natural ground side and / or a steel plate 3 on the inner air side, and two joint plates 7. In this case (especially in the case of a hexagonal steel shell), two main girders 6 and a steel plate on the natural ground side are used. 2. The joint plate 7 which is rigidly connected to the steel plate 3 on the inner space side has high rigidity, and the effect of restraining the behavior of the filling concrete 10 is extremely high as compared with the conventional anti-slipping structure. Therefore, in order to constrain the behavior in which the filling concrete 10 receives a force in the circumferential direction of the tunnel and slips out of the steel shell so as to be sandwiched between both ends of the segment, the integrated behavior of the steel shell 5 and the filling concrete 10 occurs. The behavior as a synthetic structure is obtained.
And in this invention, in order to make the said synthetic | combination structure more reliable, it is trying to exhibit the effect like following (2).
(2) Skin peeling protection effect of the steel plate 2 on the natural ground side and the steel plate 3 on the inner air side by the fixing material 4 A soil pressure load acts on the arcuate synthetic segment 1 (piece) that generally forms a tunnel segment ring in a circular shape. In this case, the transmission force acting on the tunnel segment ring flows in the circumferential direction of the tunnel. At that time, the steel plate 2 on the natural ground side and the steel plate 3 on the inner air side are deformed out of plane in the normal direction of the tunnel segment ring. Then, it tries to leave from the filling concrete 10. As a result, the steel plate 2 on the natural ground side or the steel plate 3 on the inner air side does not function effectively, and the performance of the segment decreases.
As a method for effectively suppressing the out-of-plane deformation of the steel plate 2 on the natural ground side or the steel plate 3 on the inside air side, in the present invention, the steel plate 2 on the natural ground side and / or the inside air is parallel to the transmission force (in the circumferential direction of the tunnel). The steel plate 3 on the side is fixed to the filling concrete 10 by the fixing material 4 with a space, thereby stiffening the steel plate 2 on the natural ground side and / or the steel plate 3 on the inner air side and at the same time ensuring reliable adhesion and integration. To resist the peeling force. In addition, by arranging the fixing materials 4 closely spaced in the circumferential direction of the tunnel, virtual cone breaking surfaces 12 formed by the individual fixing materials 4 are connected in the circumferential direction of the tunnel and continuous in the circumferential direction of the tunnel. By forming the virtual cone fracture surface 12 (virtual cone fracture region), the steel plate 2 on the natural ground side and / or the steel plate 3 on the inner air side is stiffened in the tunnel circumferential direction, and is reliably continuous in the tunnel circumferential direction. Thus, a stiffening line 13 that also serves as an adhering line is formed. More preferably, the virtual cone breaking surfaces 12 formed by the individual fixing materials 4 sufficiently overlap in the tunnel circumferential direction to form a continuous tunnel circumferential direction stiffening line 13, and this tunnel circumferential direction stiffening line 13 is arranged so as to be arranged at a predetermined interval in the tunnel axis direction, the skin separation restraining effect of the steel plate 2 on the natural ground side and / or the steel plate 3 on the inside air side is enhanced, and the steel plate 2 on the natural ground side And / or when the out-of-plane deformation of the steel plate 3 on the inner air side is suppressed and a compressive axial force acts in the tunnel circumferential direction, a buckling prevention effect is produced.
Therefore, the fixing material (for example, a stud gibber with a head) is discretely arranged densely in the tunnel circumferential direction at intervals in the tunnel circumferential direction, and the above-described integration integration with the filling concrete 10 is performed. The above effect can be obtained by forming the stiffening line 13 and arranging the stiffening lines 13 sparsely at a predetermined interval in the tunnel axis direction. Since the fixing material is arranged discretely in the tunnel axial direction and the circumferential direction, there is no fear that voids are formed when the concrete is filled, and the filling property of the concrete is also ensured. It is conceivable to form a stiffening line in the tunnel axis direction by the fixing material 4 as well as the stiffening line 13 in the tunnel circumferential direction by the fixing material 4, but the fixing materials are densely arranged in the tunnel axis direction. There is no need and it is not economical.

  When the fixing material 4 is a headed stud, it is preferable that the head of the headed stud has a head protruding in the circumferential direction of the tunnel, as shown in the figure, rather than a circular head. A long oval head is preferred.

  As shown in the figure, in the form in which the main girder 6 or the joint plate 7 is provided with a bolt box 23 made of a steel box-shaped material (or space), the inner steel plate 3 has a bolt fastening work. The opening is connected to the internal space of the bolt box 23. The bolt box 23 and the like are omitted in the case of a boltless joint type synthetic segment having a male joint or a female joint in the tunnel circumferential direction or tunnel axial direction (the same applies to the following embodiments).

In the following embodiments, different points are mainly described, and the same reference numerals are given to the same parts.

FIGS. 8 to 10 and FIGS. 7B and 7C show the synthetic segment 1 of the second embodiment of the present invention. The difference between this embodiment and the above embodiment is that the fixing material 4 is different, but the other structures are the same, so the difference will be mainly described.
In the second embodiment, a U-shaped steel material 14 formed by bending a deformed reinforcing bar or a deformed steel bar or other steel material into a U shape is erected on the steel plate 2 on the natural ground side and the steel plate 3 on the inner air side, and each leg portion. 15 are arranged so as to extend in the circumferential direction of the tunnel, and the distal end portion of each leg portion 15 is fixed by welding. Such a fixing material 4 made of a U-shaped steel material 14 is advantageous in terms of cost because the number of installations is reduced. Further, in the case of the fixing material 4 made of the U-shaped steel material 14, each leg portion 15 is coupled to the steel plates 2 and 3, and the lateral coupling portion 16 connecting each leg portion 15 that is rigidly coupled is shown in FIG. When the peeling force P acts as shown in (b), as shown by the arrow P1, the filling concrete 10 is pressed and resists. Further, in the case of the fixing material 4 of the U-shaped steel material 14 adjacent in the tunnel circumferential direction, as shown in FIG. 7C, a virtual cone of the fixing material 4 of the U-shaped steel material 14 adjacent in the tunnel circumferential direction. The fracture surface 12 is provided so as to be connected in the circumferential direction of the tunnel and continuous in the circumferential direction of the tunnel. Other configurations are the same as in the case of the above-described embodiment, and thus similar parts are denoted by the same reference numerals.

In the form shown in FIGS. 11 to 13, the fixing material 4 made of a T-shaped steel material 4 a is used, and the flange 28 of each head in the T-shaped steel material 4 a is a steel plate 2 on the natural ground side or a steel plate on the inner air side. 3 are arranged so as to extend in the circumferential direction of the tunnel in parallel with a distance from each other, but the other configuration is the same as in the case of the first embodiment.
When the flange 28 in such a T-shaped steel material 17 is arranged so as to extend in the tunnel circumferential direction, the flange 28 protrudes greatly in the tunnel circumferential direction, so that the interval between the fixing materials 4 adjacent in the tunnel circumferential direction is widened. Moreover, in the point which connects the virtual cone fracture | rupture surface 12 adjacent to a tunnel circumferential direction, the height of the T-shaped steel material 4a is made constant, and the arrangement pitch of the fixing material 4 of the stud of 1st Embodiment is set. Since the distance between the tips of the flanges 28 can be made smaller than this, the virtual cone breaking surface 12 can be easily connected in the circumferential direction of the tunnel and can be continuously fixed. The number of the arranged materials 4 can be reduced as compared with the case of the first embodiment.

In the fourth embodiment shown in FIGS. 14 and 15, the fixing material connecting member 19 made of deformed reinforcing bar, deformed bar or steel material continuous in the tunnel circumferential direction over the front end portion of the fixing material 4 adjacent in the tunnel circumferential direction. Is fixed by welding or the like, and the fixing members 4 are connected to each other in the tunnel circumferential direction.
In such a configuration, the connection and continuation of the virtual cone breaking surface 12 by the fixing material 4 in the tunnel circumferential direction and the adhesion resistance by the fixing material connecting material 19 can be continuously achieved in the tunnel circumferential direction. Further, the position where the fixing material connecting member 19 is provided is located in the vicinity of the head of the fixing material 4 and is continuous in the tunnel circumferential direction. In addition to the effect of being connected in the direction and being continuous, adhesion by the connecting member 19 for the fixing material can be achieved. Further, when the pull-out resistance in the tunnel radial direction or the pull-out force acts on the fixing material 4, the pull-out force can be distributed to the fixing material 4 in the tunnel circumferential direction by the connecting member 19 for the fixing material.

FIGS. 16-18 shows 5th Embodiment of this invention, Comprising: In this form, the steel plate 3 by the side of a tunnel inside is abbreviate | omitted, and the inside concrete 10 is filled inside the steel shell 5. FIG. -It is cured and exposed to the sky side in the tunnel.
The synthetic segment 1 having such a configuration can be economically constructed by installing the synthetic segment 1 in a tunnel lining portion where a compressive force does not act on the inner space of the tunnel. As a finishing material on the inner side of the tunnel, the fixing material 4 is not provided, but a steel plate such as a skin plate is provided, and contact is made between the supporting material used when assembling the segment ring and the inner concrete on the inner side. You may make it aim at prevention of the crack of concrete.
In this embodiment, the bolt box 23 is formed by a space formed by boxing or the like.

19 (a) and 19 (b) show a representative form indicating that the cross section of the main girder 6 may be L-shaped. As shown in FIG. It is good also as the L-shaped main girder 6 provided with these. The flange 18 is continuous like the web 20 in the circumferential direction of the tunnel. Further, as shown in FIG. 19A, the fixing material 4 may be provided on both the steel plate 2 on the natural ground side or the steel plate 3 on the inner air side. 19 (a) and 19 (b), both end portions in the width direction (tunnel axis direction) of the steel plate 2 on the natural ground side are butted against one end portion in the width direction of the flange 18 on the natural ground side, respectively, in the circumferential direction of the tunnel. It is fixed by continuous welding. Alternatively, the steel plate 2 on the natural ground side is placed on the outer surface of the natural ground side of the flange 18 on the natural ground side, and both ends of the steel plate 2 in the width direction (tunnel axis direction) and the flange 18 on the natural ground side are continuously connected in the tunnel circumferential direction. It may be fixed by fillet welding. In FIG. 19A, one end in the width direction of the web 20 is fixed by welding W continuously in the tunnel circumferential direction inside the tunnel radial direction on the other end in the width direction of the flange 18. The other end in the direction is fixed to the end of the steel plate 3 on the inner air side by welding W continuous in the circumferential direction of the tunnel. The form in which the fixing material 4 is provided by welding W to form the fixing material row 11 in the circumferential direction of the tunnel, or the deformation form of the fixing material 4 is the same as in the case of each of the embodiments.

20 (a) and 20 (b) show a representative form indicating that the cross section of the main girder 6 may be an inward groove shape. As shown in FIG. It is good also as the groove-shaped main girder 6 integrally provided with the flange 18 which continues in the circumferential direction of the tunnel on the empty side.
20 (a) and 20 (b), the inner air side flange 18 is fixed to the inner air side end portion of the web 20 by continuous welding W in the tunnel circumferential direction. As described above, in the embodiment in which the flange 18 is provided on the inner space side of the tunnel, in the embodiment in which the bolt box 23 is provided, the inner space side flange 18 is divided in the circumferential direction of the tunnel. A known male joint or female joint that can be joined without bolts without being provided is provided on the web 20 of the main beam 6 or on the joint plate 7. The web 20 and each flange 18 are fixed to the joint plate 7 by welding (not shown) continuous in the tunnel circumferential direction or the tunnel axial direction.
Both end portions in the width direction (tunnel axis direction) of the steel plate 3 on the inner space side in FIG. 20A are respectively butted against one end portion in the width direction of the flange 18 on the inner space side, and are continuously welded in the circumferential direction of the tunnel. It is fixed by.
Further, in FIG. 20A, the end of the web 20 in the width direction inner space is fixed to the width direction end of the flange 18 on the inner space by welding W continuous in the tunnel circumferential direction.
In this embodiment, the joint plate 7 can be fixed more firmly to the ground-side flange 18 and the inner-spaced flange 18 by a rigid connection by continuous welding in the tunnel axial direction and the tunnel radial direction. Coupled with the fact that each steel flange 18 is thick, the joint plate 7 is firmly fixed. In FIG. 20B, a decorative steel plate on the inner side may be disposed over each flange 18 and fixed by welding.

  21 (a) and 21 (b) show a representative form indicating that the cross section of the main girder 6 may be I-shaped (or H-shaped), as shown in FIG. 21 (a). Alternatively, the main girder 6 may have an I-shaped (or H-shaped) cross section integrally provided with a flange 18 on the inner space side. The web 20 may be arranged at the center in the width direction of the flange 18 and fixed by welding, or may be the main girder 6 having an I-shaped cross section that has been rolled. In such a form, a joint can be arrange | positioned in the groove part formed by the web 20 and the flange 18, and the segments adjacent to a tunnel axial direction can be joined by boltless.

22 (a) and 22 (b) show a representative form showing that the cross section of the main girder 6 may be an outward groove shape, and the web 20, the natural mountain side and the inner space as shown in FIG. A groove-shaped main girder 6 integrally provided with a flange 18 on the side may be used.
In this embodiment, the web 20 is disposed on one end side in the width direction of the flange 18 on the natural ground side and the flange 18 on the inner space side, and is fixed by welding W which is continuous in the circumferential direction of the tunnel by welding W.

26 to 28 show a composite segment according to a thirteenth embodiment of the present invention. In this embodiment, the steel plate 2 on the side of the tunnel ground is omitted, and the inside concrete 10 is placed inside the steel shell 5. Is filled and hardened and exposed to the tunnel ground.
The synthetic segment 1 having such a configuration can be economically constructed by installing the synthetic segment 1 at a tunnel lining site where the compressive force does not act greatly on the tunnel ground. In addition, on the tunnel ground side, a steel plate like a skin plate without the fixing material 4 is provided, and the main girder 6 and the joint plate 7 are fixed in a liquid-tight manner by continuous welding so as to improve the water stop performance of the segment. May be.

When the composite segment 1 of each of the above embodiments is used in a tunnel lining structure, for example, as shown in FIG. 29, the composite segment 1 is incorporated in part or all of the tunnel circumferential direction, and adjacent to the tunnel circumferential direction. The joint plates 7 of the matching segments are connected to each other by bolts and nuts to form the segment ring 22, and the main beams 6 of the segments adjacent to each other in the tunnel axial direction are connected to each other by bolts and nuts (or joints). The axially adjacent segment rings 21 are connected to each other.
In addition, as mentioned above, the joint plate 7 and the main girder 6 of the composite segment 1 are provided with a male joint or a female joint so that the joints of adjacent segments in the tunnel circumferential direction or the tunnel axial direction are fitted to each other. In such a case, it is not necessary to provide the bolt hole 21 and the bolt box 23 in the joint plate 7 and the main beam 6.

  Since the composite segment 1 as described above according to the present invention has high rigidity, it is possible to reduce the thickness of the composite segment in the tunnel radial direction. When the diameters are the same, the inner space of the tunnel lining can be increased, and an economical and rational tunnel lining structure can be obtained.

  When carrying out the present invention, it can be used as a tunnel lining segment having a deep depth or a lining segment for constructing an underground space having a large underground space.

  When carrying out the present invention, the fixing material 4 is an L-shaped steel material obtained by bending a reinforcing bar, a steel bar, or a steel material into an L shape, or an L-shaped steel material configured by cutting a steel material having an L-shaped cross section into a short length. Used, a piece of L-shaped steel material is used as a leg portion so as to stand upright with respect to the steel plate 2 on the natural ground side or the steel plate 3 on the inside air side, and the other piece is provided on the steel plate 2 on the natural ground side or on the inside air side. By arranging so as to extend substantially parallel to the steel plate 3 and in the circumferential direction of the tunnel, a stiffening line in the circumferential direction of the tunnel can be efficiently formed. As described above, as the fixing material 4, the configuration including the overhanging portion extending in the tunnel circumferential direction is sufficient in that the virtual cone breaking surface 12 is efficiently connected and continuous in the tunnel circumferential direction.

  When the present invention is implemented, the virtual cone fracture surface between the stiffening lines adjacent in the tunnel axis direction may be located away from the tunnel axis direction.

  When carrying out the present invention, the U-shaped steel members 14 spaced in the tunnel axis direction are connected to each other by a fixing material connecting member 19 in the tunnel axis direction to form one fixing material. Good.

  You may use the synthetic | combination segment of this invention as a segment of a tunnel branch junction part.

  When practicing the present invention, depending on the width dimension of the composite segment 1 in the tunnel axial direction, the tunnel circumferential direction fixing material rows 11 provided on the steel plate 2 on the natural ground side or the steel plate 3 on the inner air side are arranged in three rows, four rows or more. The number of columns may be provided. In this case, the out-of-plane deformation in the tunnel normal direction of the steel plate 2 on the natural ground side or the steel plate 3 on the inner air side becomes the largest in the center of the width of the composite segment 1 in the tunnel axis direction. 11 is preferably provided at least in the center of the width in the tunnel axis direction.

  When carrying out the present invention, in the form in which the middle main girder is provided between the main girders 6, the tunnel circumferential direction fixing of one row in the tunnel circumferential direction, preferably two or more rows, between the main girder and the middle main girder is performed. The material row 11 is provided, and two or more rows are provided in the tunnel axis direction as the entire segment. In this case as well, as in the case where the middle main beam is not provided between the main beams 6, it is desirable to provide the tunnel circumferential direction fixing material row 11 at least in the center of the width in the tunnel axis direction.

DESCRIPTION OF SYMBOLS 1 Composite segment 2 Steel plate 3 on the ground side Steel plate 4 on the inner side 4 Fixing material 4a T-shaped steel material 5 Steel shell 6 Main girder 7 Joint plate 8 Out-of-plane deformation on the natural side 9 Out-of-plane deformation 10 on the inner side Concrete 11 Tunnel anchoring material row 12 Virtual cone fracture surface (or virtual cone fracture area)
13 Stiffening line 14 U-shaped steel material 15 Leg portion 16 Lateral connection portion 17 T-shaped steel material 18 Flange 19 Fixing material connection material 20 Web 21 Bolt hole 22 Segment ring 23 Bolt box 28 Flange 40 Composite segment G Tunnel axial direction Interval G1 Tunnel circumferential direction P Tunnel circumferential direction compression force S Tunnel circumferential direction tensile force

Claims (7)

  Inside of a steel shell having at least two main girders, two joint plates respectively disposed at both ends in the circumferential direction of the tunnel, and a steel plate provided on one or both of the natural ground side and the inner air side And a concrete segment filled with concrete, wherein either one or both of the steel plate on the inner side of the steel shell and the inner air side or both of them are provided with an independent fixing material in the tunnel circumferential direction and the tunnel axis. Are installed at intervals in the direction of the tunnel, and the tunnel circumferential direction fixing material row is formed by setting the distance in the tunnel circumferential direction narrower than the distance in the tunnel axis direction to form a tunnel circumferential direction fixing material row. The intervals in the tunnel axis direction of the rows are arranged to be wider and sparser than the intervals between the fixing materials in the circumferential direction of the tunnel, and the joint plate is connected to the joint plate and either the natural ground side or the inner air side. Synthetic segments, characterized in that the steel sheet and the at least two main girders provided both are rigidly connected by continuous welding in the whole line to be butted adjacent.   On the inside of a steel shell having at least two main girders, two joint plates respectively disposed at both ends in the circumferential direction of the tunnel, and a steel plate provided on either the natural ground side or the inner air side, A synthetic segment filled with concrete, wherein an independent fixing material is spaced apart in the tunnel circumferential direction and tunnel axial direction on either the ground side or the inner side of the steel plate on the inner side of the steel shell. The tunnel circumferential direction fixing material row is formed by setting the distance in the tunnel circumferential direction to be narrower than the distance in the tunnel axis direction to form a tunnel circumferential direction fixing material row, and the tunnel axis of the tunnel circumferential direction fixing material row adjacent to the tunnel axis direction. An interval in the direction is arranged to be wider and sparser than an interval of the fixing material in the circumferential direction of the tunnel, and the joint plate includes a steel plate and a front plate provided on the joint plate and either the natural ground side or the inner space side. Synthetic segments, characterized in that at least two main girders are rigidly connected by continuous welding in the whole line to be butted adjacent.   Concrete is placed on the inside of a steel shell having at least two main girders, two joint plates respectively disposed at both ends of the tunnel circumferential direction, and steel plates provided on both the natural ground side and the inner air side. It is a synthetic segment formed by filling, and an independent fixing material is installed at both the circumferential direction of the tunnel and the axial direction of the tunnel on both the ground and inner sides of the steel plate on the inner surface of the steel shell. At the same time, the tunnel circumferential direction fixing material row is formed by setting the interval in the tunnel circumferential direction narrower than the tunnel axial direction to form the tunnel circumferential direction fixing material row, and the tunnel circumferential direction fixing material row adjacent to the tunnel axis direction The joint plate is arranged to be wider and sparser than the interval between the fixing materials in the circumferential direction of the tunnel, and the joint plate includes a steel plate provided on both the joint plate and the natural mountain side or the inner space side, and the at least two main girders. Synthetic segments, characterized in that the continuous welding in the whole line to be butted to adjacent rigidly coupled.   The composition according to any one of claims 1 to 3, wherein virtual cone fracture surfaces by fixing materials installed at intervals in the circumferential direction of the tunnel are connected in the circumferential direction of the tunnel and are continuous. segment.   The synthetic segment according to any one of claims 1 to 4, characterized in that the main girder section is an I-shaped, L-shaped or U-shaped section with a flange and a web.   The synthetic segment according to any one of claims 1 to 5, wherein the fixing material is one of a head stud stud, a T-shaped steel material, a U-shaped steel material, and an L-shaped steel material.   A tunnel lining, wherein the composite segment according to any one of claims 1 to 6 is used in a tunnel lining structure.

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