JP2011140825A - Segment lining body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a segment lining body which secures the water sealing performance between segments while suppressing manufacturing labor and manufacturing costs. <P>SOLUTION: An end plate 8 is fixed on the outer surface side of a main girder 4, and the composite segments 1 adjacent to each other are connected together via a water sealing material 9 of a water sealing groove 81 which is formed on the end plate 8. Thus, a water sealing structure can be constituted between the composite segments 1, preventing the leakage of groundwater etc. to the convergence side of a tunnel. Since the water sealing groove 81 is formed on the end plate 8 separate from the main girder 4, the water sealing groove does not have to be formed in the main girder 4 by rolling and cutting work. This enables the composite segments 1 to be manufactured in a relatively simple manner. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a segment lining body that is used for tunnel lining by combining a plurality of segment pieces.

  Conventionally, when constructing shield tunnel linings that require high water-stopping properties such as underground rivers and road tunnels by combining segment pieces, a pair of main girders, a pair of joint plates that connect the ends, and these grounds A segment that has a steel shell with a natural mountain side skin plate that is fixed on the mountain side and surrounded by five surfaces other than the inner air side, and a skin plate that is also fixed to the inner air side to surround the six surfaces A segment having a steel shell is used. In such a joint portion between segments, a water stop groove is formed in the main girder and the joint plate, and the segments are connected via a seal material provided in the water stop groove, so that the inner space can be A water stop structure that prevents leakage of groundwater or the like to the side is generally used (see, for example, Patent Document 1). Such a water stop groove can be formed on the main girder or joint plate by rolling flat steel or shape steel with a water stop groove by rolling, or by machining a thick plate or shape steel without a groove. There are methods to apply.

  Also, when building a tunnel at a deep depth or on soft ground, a large bending strength is required for the segment, and in order to reduce the thickness of the tunnel lining, the bending strength of the steel shell is improved. There is a need. As a method for increasing the proof stress of the steel shell in this way, a main girder having an H-shaped cross section as described in Patent Document 1 is used, or a flange is welded to an I-shaped main girder to form a T-shaped cross section. It is important to integrally and firmly form the entire steel shell, for example, by improving the cross-sectional performance of the girders and welding and joining the main girder and the joint plate to transmit the tensile force acting on the joint plate.

JP-A-8-303190

  By the way, when the water stop groove is formed on the main girder or joint plate by rolling or cutting as in the conventional segment, the manufacturing equipment becomes larger, the processing time is increased, and the steel is wasted due to processing. This increases the manufacturing effort and cost, which is inconvenient. Also, if the welding amount increases, such as welding the main girder flange or welding the main girder to the joint plate, the main girder and the joint plate will be deformed by the heat during welding, and the formed water stop Since the positional accuracy of the groove is lowered and the water stop performance is impaired, a great amount of labor is required for the correction work after welding.

  The objective of this invention is providing the segment lining body which can ensure the water stop performance between segments, suppressing manufacturing effort and manufacturing cost.

  The segment lining body of the present invention is a segment lining body that is used for tunnel lining by combining a plurality of segment pieces. The segment lining body extends along the circumferential direction of the tunnel and opposes each other. A pair of joint plates that connect both ends of the girder in the circumferential direction of the girder, and at least five surfaces including a surface plate whose four sides are fixed to the main girder and the joint plate on at least one of the tunnel ground side and the inner space side And an end plate having a water stop groove separate from the main girder and the joint plate is attached to the outer surface side of at least one of the main girder and the joint plate. The end plate having a structure is characterized in that it can be connected to an end plate having a water stop groove in another adjacent segment piece via a water stop material.

  According to the present invention described above, by attaching an end plate having a water stop groove on the outer surface side of the main girder or joint plate, it is possible to connect the water stop portions of adjacent segment pieces to form a water stop structure. it can. And by forming a water stop groove on the end plate separate from the main girder and joint plate, it is not necessary to form a water stop groove by rolling or cutting on the main girder, etc. it can. At this time, since the end plate having the water stop groove does not need rigidity and proof strength as a structural material, for example, the water stop groove can be formed by press working using a thin and light steel plate or the like (resin (plastic) ), It is possible to make a molded part, and the manufacturing labor and cost can be further reduced. Furthermore, when the strength of the steel shell is increased by welding a flange to the main girder or welding the main girder and the joint plate, even if the main girder or joint plate is deformed by welding heat, Since the end plate having the water stop groove is a separate body, the end plate is not affected by the deformation, and the position accuracy in the water stop groove can be secured to improve the water stop performance. Correction work can also be reduced and manufacturing labor can be further reduced. For this reason, since the proof stress of a segment piece can be raised easily, thickness reduction can be achieved and it becomes easy to apply to the tunnel lining in a large depth and soft ground.

Under the present circumstances, in the segment lining body of this invention, it is preferable that the end plate which has the said water stop groove is provided in the outer surface side of the said main girder.
According to such a configuration, the segments adjacent to each other in the tunnel axial direction are connected to each other through the end plate having the water stop groove, and the water stop performance between the segments is achieved by the water stop material such as the sealing material installed in the water stop groove. Can be secured. It is effective to improve the cross-sectional performance of the main girder in order to improve the strength of the steel shell, but even if the cross-sectional shape of the main girder is H-shaped or T-shaped, Since the water stop structure can be constituted by the end plate having the groove, the strength improvement of the steel shell can be easily realized. In addition, by not providing an end plate having a water stop groove on the outer surface side of the joint plate, a conventional structure can be used as a joint structure of joint plates between segments adjacent in the tunnel circumferential direction. Construction can be performed without changing the construction equipment, jigs, and work procedures required to construct the segment ring.

In the segment lining body of the present invention, the segment piece is a synthetic segment in which a filler is filled in the steel shell, and has at least one of the main girder and the joint plate and the water stop groove. The filler is preferably filled in the gap with the end plate.
According to such a configuration, when using a synthetic segment in which a filler such as concrete is filled inside the steel shell, the filler is also provided in the gap between the main girder and the joint plate and the end plate having the water stop groove. By filling, the compressive force which acts on the end plate which has a water stop groove can be transmitted to a filler, and the rigidity and proof stress of a synthetic segment can be improved. Furthermore, since movement and deformation | transformation of the end plate which has a water stop groove | channel are suppressed by being restrained by a filler, the positional accuracy of a water stop groove | channel can be raised and water stop performance can be improved.

At this time, in the segment lining body of the present invention, the synthetic segment is formed in the steel shell in a state where the end plate having the water stop groove is positioned by a jig that contacts the outside of the end plate having the water stop groove. It is preferable to manufacture by filling a filler.
According to such a configuration, when filling the steel shell with the filler, the jig is brought into contact with and positioned on the outer side of the end plate having the water stop groove, thereby preventing misalignment during filling. The position accuracy of the end plate having the water stop groove after the filler is cured can be ensured.

  According to the segment lining body of the present invention as described above, the main girder and the joint plate are deformed by welding heat by forming the water stop groove on the end plate separate from the main girder and the joint plate. However, the influence of the deformation does not reach the end plate having the water stop groove, so that the position accuracy in the water stop groove can be secured and the water stop performance can be improved. Furthermore, it is no longer necessary to form a water stop groove by rolling or cutting on the main girder, etc., and by forming a water stop groove on the end plate that does not require rigidity or proof stress as a structural material, relatively simple manufacturing equipment Thus, it is possible to manufacture the segment, and it is possible to reduce the manufacturing cost by reducing the processing effort.

It is a perspective view which shows the segment used for the segment lining of this invention. It is sectional drawing which shows the said synthetic segment. It is sectional drawing which shows the modification of the said synthetic segment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a synthetic segment 1 which is a segment piece for constructing a tunnel lining (segment lining body) according to the present invention.
The tunnel lining is constructed by combining a plurality of segment pieces (synthetic segment 1) inside the excavated natural ground. After excavating the natural ground with a shield machine, the segment piece is located behind the shield machine. It is constructed by repeating the procedure of pushing the assembled segment ring with a jack to advance the shield machine and excavating the ground. This tunnel lining partitions the natural ground from the tunnel interior and secures the space inside the tunnel by resisting earth pressure and water pressure from the natural ground. The tunnel cross-sectional shape is not limited to a general circular shape, and may be a deformed tunnel cross-section including a rectangular tunnel.

  As shown in FIG. 1, the composite segment 1 has a steel shell 2 surrounded by five surfaces other than the inner side of the tunnel, and an intermediate concrete 3 as a filler filled in the steel shell 2. The steel shell 2 and the filling concrete 3 are integrated. The steel shell 2 includes a pair of main girders 4 and 4 that extend along the circumferential direction of the tunnel and face each other, a pair of joint plates 5 and 5 that connect both ends of the opposed main girders 4 and 4, A skin plate 6 as a surface plate fixed to the main girders 4 and 4 and the joint plates 5 and 5 on the mountain side, and a plurality of reinforcing ribs 7 installed between the opposing main girders 4 and 4; The main girder 4, the joint plate 5, the skin plate 6 and the reinforcing rib 7 are formed in a box shape by welding and fixing together.

  As shown in FIG. 2, the main girder 4 is welded and fixed to a main girder body 41 that extends in the tunnel width direction and is formed in an arc shape in the circumferential direction of the tunnel, and to the air side edge of the main girder body 41 in the tunnel. And has a substantially T-shaped cross section. In the main girder body 41, through holes 43 for inserting the filling concrete 3 are formed at appropriate intervals. An end plate 8 separate from the main beam 4 is attached to the outer surface side of the main beam 4. This end plate 8 is made of a pressed thin and light steel plate or the like, and is formed to have a water stop groove 81 that is recessed on the main girder 4 side (inside the steel shell 2) and that is continuous in the circumferential direction of the tunnel. It is configured to be connectable to the end plate 8 in another adjacent synthetic segment 1 through a water blocking material 9 installed in the groove 81.

  The joint plate 5 is composed of a straight plate-shaped steel plate along the tunnel axial direction and the circumferential direction, and an inter-piece bolt box 51 is fixed at two positions on the inner surface of the steel plate 2 so as to protrude inward. Yes. These inter-piece bolt boxes 51 are joint members for joining with other composite segments 1 adjacent in the tunnel circumferential direction, and the similar inter-piece bolt boxes 51 are also fixed to the other adjacent composite segments 1. By fixing these inter-piece bolt boxes 51 with a joining material (short bolt for joining) (not shown), the synthetic segments 1 are mechanically connected to each other to form a segment ring. Yes. Further, on the outer surface side of the joint plate 5, a water stop groove 52 is formed at the same radial position as the water stop groove 81 of the end plate 8. It is configured to be connectable to another composite segment 1 that is adjacent in the circumferential direction of the tunnel.

  Skin plate 6 is composed of a plate-shaped curved steel plate along the circumferential direction of the tunnel, and an inner surface slightly inward from the edge in the tunnel axial direction is welded and fixed to main girder body 41. An end plate 8 is fixed to the end edge by welding. The end plate 8 may be fixed by welding to the flange 42 of the main girder 4 or may be separated from the flange 42. On the other hand, the edge in the circumferential direction of the tunnel of the skin plate 6 is fixed by welding to the joint plate 5, and the reinforcing rib 7 is fixed by welding to the inner surface of the skin plate 6 in the tunnel. The reinforcing rib 7 is made of a steel material having an appropriate cross-sectional shape, and both end portions thereof are welded and fixed to the inner surface of the main girder main body 41, and the reinforcing rib 7 is penetrated for inserting the filling concrete 3. Holes 71 are formed at appropriate intervals.

  In the composite segment 1 described above, the main girder 4, the joint plate 5, the skin plate 6 and the reinforcing rib 7 are welded and fixed to each other to form the steel shell 2, and then the end plate 8 is fixed to the edge of the skin plate 6 by welding. After that, as shown in FIG. 1, the intermediate concrete 3 is cast into the steel shell 2 with the inner side of the tunnel 2 facing upward in the tunnel. At this time, the filling concrete 3 is placed in a state where the end plate 8 is positioned using a jig (not shown) that contacts the outer surface side of the end plate 8, and the through holes 43 of the main girder 4 and the reinforcing rib 7 are arranged. The filled concrete 3 is filled to the corners inside the steel shell 2 through 71, particularly to the space between the main beam 4 and the end plate 8. Then, by removing the jig after the filling concrete 3 is cured, the end plate 8 restrained by the cured filling concrete 3 is fixed at a predetermined position.

The segment in the present embodiment is not limited to the composite segment 1 but may be a composite segment 1A, 1B, or 1C having the form shown in FIGS. 3A to 3C below.
The synthetic segment 1A shown in FIG. 3 (A) is different from the synthetic segment 1 in the fixing position of the main beam 4 and the skin plate 6, and the main beam 4 is greatly displaced inward from the tunnel axis direction edge of the skin plate 6. A gap is formed between the flange 42 of the main beam 4 and the end plate 8. Therefore, the filling concrete 3 can be filled between the main beam 4 and the end plate 8 from this gap, and the through-hole 43 like the main beam 4 of the composite segment 1 can be omitted.

  The synthetic segment 1B shown in FIG. 3B is composed of a single steel plate in which the flanges 42 of the pair of main girders 4 are connected to each other. In this case, by forming an appropriate number of filling holes 44 in the intermediate portion of the flange 42, the filling concrete 3 can be filled into the steel shell 2 from the filling holes 44. Further, in the composite segment 1B, by increasing the cross-sectional area of the flange 42 of the main girder 4, the cross-sectional performance of the main girder 4 can be remarkably improved and the bending strength can be increased, and the synthetic segment 1B can be thinned. Can do.

  The composite segment 1C shown in FIG. 3 (C) is provided with the flange 42 of the main girder 4 positioned on the inner side (ground mountain side) of the joint plate 5 and the end plate 8 from the inner edge of the tunnel in the tunnel. A gap is formed between 42 and the end plate 8. Therefore, even when the main girder body 41 and the flange 42 are inclined due to the heat generated when the main girder body 41 and the flange 42 are welded, the main girder body 41 and the flange 42 are inclined. It does not interfere with the end plate 8 or a part of the flange 42 protrudes toward the inner side of the tunnel, and the work load of the correction work for the deformation due to welding heat can be reduced.

According to the present embodiment as described above, the following effects can be obtained.
That is, the end plate 8 is fixed to the outer surface side of the main girder 4, and the adjacent composite segments 1 are connected to each other via the water stop material 9 of the water stop groove 81 formed in the end plate 8, so that the composite segment A water stop structure can be formed between the two, and leakage of groundwater or the like to the sky inside the tunnel can be prevented. And since the water stop groove 81 is formed in the end plate 8 separate from the main girder 4, it is not necessary to form the water stop groove in the main girder 4 by rolling or cutting. While the synthetic segment 1 can be manufactured, the manufacturing effort can be reduced and the manufacturing cost can be reduced. Furthermore, even if the flange 42 is welded to the main girder 4 and the main girder 4 and the joint plate 5 are welded and the deformation due to the welding heat occurs, the main girder 4 and the end plate 8 are separated. Thus, the flatness can be ensured without affecting the end plate 8, the position accuracy in the water stop groove 81 can be secured to improve the water stop performance, and the deformation correction work can also be reduced. Manufacturing labor can be further reduced.

In addition, this invention is not limited to the said embodiment, Including other structures etc. which can achieve the objective of this invention, the deformation | transformation etc. which are shown below are also contained in this invention.
For example, in the above-described embodiment, the skin plate 6 as the surface plate is provided only on the natural ground side. However, the surface plate may be provided not only on the natural ground side but also on the inside sky side. A surface plate may be provided. Moreover, in the said embodiment, although the end plate 8 was provided only in the outer surface side of the main girder 4, you may provide the end plate which has a water stop groove not only in this but in the outer surface side of the coupling plate 5. FIG.
Moreover, in the said embodiment, although the synthetic segment 1,1A, 1B, 1C which filled the concrete 3 inside the steel shell 2 was demonstrated, as a segment covering body of this invention, it is not restricted to what combined the synthetic segment. The steel shell 2 may be constructed by combining hollow steel segments.
Further, the filler is not limited to concrete, and any material having appropriate strength and rigidity such as non-shrink mortar can be used.

In addition, the best configuration, method and the like for carrying out the present invention have been disclosed in the above description, but the present invention is not limited to this. That is, the invention has been illustrated and described with particular reference to certain specific embodiments, but without departing from the spirit and scope of the invention, Various modifications can be made by those skilled in the art in terms of material, quantity, and other detailed configurations.
Therefore, the description limiting the shape, material, etc. disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such restrictions is included in this invention.

  1, 1A, 1B, 1C ... Synthetic segment, 2 ... Steel shell, 3 ... Filled concrete (filler), 4 ... Main girder, 5 ... Joint plate, 6 ... Skin plate (surface plate), 8 ... End plate, 81: Water stop groove.

Claims (4)

A segment lining body used for tunnel lining by combining a plurality of segment pieces,
Main girder extending along the circumferential direction of the tunnel and facing each other, a pair of joint plates for connecting both ends of the opposed main girder in the circumferential direction of the tunnel, and at least one of the tunnel ground side and the inner space side A steel plate having at least five sides surrounded by a main plate and a surface plate that is fixed to the joint plate by four sides;
An end plate having a water stop groove separate from the main girder and the joint plate is attached to at least one outer surface side of the main girder and the joint plate, and the end plates having the water stop groove are adjacent to each other. The segment lining body is configured to be connectable via an end plate having a water stop groove in the segment piece and a water stop material. In the segment lining body according to claim 1,
An end plate having the water stop groove is provided on the outer surface side of the main girder. In the segment lining body according to claim 1 or claim 2,
The segment piece is a synthetic segment in which a filler is filled in the steel shell, and the filler is filled in a gap between at least one of the main girder and the joint plate and the end plate having the water stop groove. Segment lining body characterized by being made. In the segment lining body according to claim 3,
The synthetic segment is manufactured by filling the steel shell with a filler in a state where the end plate having the water stop groove is positioned with a jig that contacts the outside of the end plate having the water stop groove. Characteristic segment lining body.

Images