JP2020063602A - Tunnel with water channel - Google Patents

Abstract

To facilitate construction and to reduce cost by enabling a deep groove part to be formed even in a case where a bore of a tunnel is large.SOLUTION: A tunnel 1 with water channel is constructed by axially connecting a segment ring 2 which is configured by coupling multiple covering segments. A groove part 5 is formed by coupling a first groove piece 11 of a first invert segment 3 and a second groove piece 13 of a second invert segment 4 which are installed on a bottom of the segment ring 2. A first projection part 10 adjacent to the first groove piece 11 of the first invert segment 3 is formed from a standing wall and a first check corridor 10b. A second projection paer 12 adjacent to the second groove piece 13 of the second invert segment 4 is formed from a standing wall and a second check corridor 12b. A synthetic resin waterproof sheet 15 is installed inside of the groove part 5, and sewage water flows on the waterproof sheet 15 of the groove part 5.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a tunnel with a water channel in which an invert segment is installed at the bottom of the tunnel constructed by, for example, a shield construction method and the groove can be used as a water channel.

Conventionally, for example, common grooves, railway tunnels, road tunnels, etc. have been constructed as drainage grooves formed at the bottom of a shield tunnel. Further, a TBM tunnel or the like having a drainage groove of a section used as a liner is also known. An example of these shield tunnels is one in which an invert block is installed at the bottom of the inner surface of the primary lining. A formwork was installed in the bottom segment of the primary lining (segment) assembled in a cylindrical shape, and invert concrete was placed from the ground with a pump car etc. to form an invert block waterway.
As another example, in Patent Document 1, for example, a tunnel made of a secondary lining is constructed inside a shield tunnel made of a primary lining constructed underground, and an invert segment is installed at the bottom of the secondary lining. . On the inner peripheral surface of the invert segment, a traveling guide groove of the carrier truck and a space used for a wind pipe or the like are integrally formed. By this travel guide groove, it is possible to omit the installation and removal of rails of the carriage and the installation and removal of air ducts.

  Further, in the shield tunnel described in Patent Document 2, a welding metal piece made of a separate member is welded and fixed as an invert block on both sides of the space at the bottom of the shield tunnel of the primary lining to form a groove. The groove of this invert block is used as a traveling path used for traveling of a carrier truck for materials and equipment.

JP 2001-288992 A JP, 2016-84653, A

  By the way, when forming a groove part by an invert segment in a shield tunnel, as shown in FIG. 6, in a tunnel with a small diameter of about 2 to 3 m, the invert segment 100 having a length of 3 m as described in Patent Document 1 is used. Although the groove portion 101 having a predetermined depth can be formed by the method, in this case, the thickness of the invert segment 100 is larger than that of the other segments. Further, as shown in FIG. 7, in a large-diameter tunnel having a diameter of about 10 m, it becomes difficult to form a deep groove portion with the one-piece invert segment 102. Therefore, there is a drawback that the amount of water that can be poured is small and the water easily overflows.

In the tunnel described in Patent Document 1 described above, since the groove is formed at the bottom of the invert segment of the secondary lining, the depth of the groove is shallow so that it does not reach the primary lining. Moreover, since a groove having a large diameter such as an inner diameter of 10 m has a shallow groove depth, a groove having a sufficient depth cannot be obtained.
Further, in the invert block of the shield tunnel described in Patent Document 2, the groove can be formed relatively deeply, but since the welding metal fitting in the space at the bottom of the shield tunnel of the primary lining is welded and fixed, the groove is formed. The invert block is a separate member from the primary lining and is a separate construction from the shield tunnel construction. Therefore, there was a problem that the construction period was long and the cost was high.

  The present invention has been made in view of such a problem, and an object thereof is to provide a tunnel with a water channel that can form a deep groove portion even if the diameter of the tunnel is large, and that is easy and inexpensive to construct. To do.

That is, the tunnel with a waterway according to the present invention is a tunnel with a waterway formed by connecting segment rings formed by connecting a plurality of lining segments along the axial direction, and is installed at the bottom of the segment ring and has one end A first invert segment having a first recess formed therein, and a second invert segment having a second recess formed at the bottom of the segment ring and abutting the first recess at one end, A groove is formed by connecting the recess and the second recess as a water channel.
According to the present invention, the first recessed portion of the first invert segment and the second recessed portion of the second invert segment are connected to and installed at the bottom of the segment ring to form a groove portion as a water channel, thereby reducing strength. The depth of the groove can be made deeper or larger than the one-piece invert segment, and the first and second invert segments are pre-fabricated in the factory, so on-site construction can be done in a short period of time. , Can be manufactured at low cost.

Further, it is preferable that the groove has a bottom surface formed on an extension of the inner peripheral surface of the lining segment.
Since the groove portion has the bottom portion formed on the extension line of the inner peripheral surface of the lining segment, the depth of the groove portion can be deepened.

Further, it is preferable that a waterproof sheet or a waterproof layer for preventing water leakage is installed on the inner surface of the groove.
Since the water flows on the waterproof sheet or waterproof layer in the groove, it can be prevented from leaking from the connecting portion of the invert segment.

Further, the first recess and the second recess have different circumferential lengths, and in the axial direction of the tunnel, the first invert segment and the second invert segment are alternately arranged in opposite directions centering on the groove. preferable.
By arranging the first concave portion and the second concave portion that form the groove portion alternately in opposite directions in the axial direction of the tunnel around the groove portion, the tunnel strength is improved.

According to the tunnel with a water channel according to the present invention, the groove for the water channel can be formed by joining the first recess and the second recess of the two-piece invert segment at the center of the bottom of the tunnel, without sacrificing the strength. The groove can be formed deeper than the one-piece invert segment. In addition, even when the water flow in the tunnel is small, it can be collected in the groove and reliably flowed.
Moreover, the groove portion can be used as a traveling path for a carrier truck for materials and equipment during the construction period. Since each segment can be manufactured in advance at the factory, the construction period on site can be shortened and the cost is low.

FIG. 3 is an explanatory view of a main part showing a segment ring of the shield tunnel according to the first embodiment of the present invention. It is a principal part perspective view which shows the invert segment which forms the groove part shown in FIG. It is a principal part perspective view which shows the process of installing a waterproof sheet in the groove part of an invert segment. FIG. 8 is an explanatory view of a main part showing an arrangement of invert segments in a segment ring of a shield tunnel according to a second embodiment. It is a principal part perspective view which shows the process of installing a waterproof sheet in the shield tunnel shown in FIG. It is a figure which shows the segment ring of the conventional shield tunnel. It is a figure which shows the segment ring of the conventional shield tunnel different from FIG.

Hereinafter, a tunnel with a waterway according to an embodiment of the present invention will be described with reference to the accompanying drawings.
1 to 3 show a tunnel with a water channel according to a first embodiment of the present invention.
FIG. 1 shows a segment ring 2 of a tunnel 1 with a water channel according to this embodiment, which constitutes a shield tunnel having an inner diameter of, for example, 4 m to 5 m. The inner diameter of the segment ring 2 can be appropriately set, and may be set to a large diameter of 10 m, for example.
The segment ring 2 is composed of, for example, six segment pieces. A first invert segment 3 and a second invert segment 4 are installed at the bottom portion, and the first and second invert segments 3 and 4 form a groove portion 5 serving as a water channel. A general arc-shaped segment 7 is arranged on both sides of the segment, and a key segment 8 is fitted on the top. These respective segments are connected to each other by an inter-segment joint (inter-piece joint).

  In the first invert segment 3 shown in FIG. 2, a thick first ridge 10 that bulges in a substantially triangular cross-section is formed on one end side of a main body 3a having a substantially arc plate shape, and the first ridge 10 is formed. A first groove piece 11 having substantially the same thickness as that of the main body 3a is formed at one end portion following the. The first raised portion 10 has a standing wall 10a that stands substantially vertically from the first groove piece 11 and a first inspection gallery 10b that forms a horizontal plane perpendicular to the standing wall 10a. The first groove piece 11 and the standing wall 10a form a first recess having a substantially L-shaped cross section.

In addition, the second invert segment 4 is formed with a second ridge 12 that is bulged in a substantially triangular cross section at a substantially central portion of a main body 4a having a substantially arc plate shape. A second groove piece 13 having substantially the same thickness as that of the main body 4a is formed at the end portion of. The second raised portion 12 has a standing wall 12a that stands substantially vertically from the second groove piece 13 and a second inspection gallery 12b that forms a horizontal plane perpendicular to the standing wall 12a. The second groove piece 13 and the standing wall 12a form a second recess having a substantially L-shaped cross section.
It is preferable that the first raised ridge 10 and the second raised ridge 12 have the first inspection gallery 10b and the second inspection gallery 12b set on a horizontal plane having substantially the same height, so that an operator or the like can perform maintenance and repair of the tunnel 1. For example, the first inspection corridor 10b and the second inspection corridor 12b can pass through. The first groove piece 11 and the second groove piece 13 are preferably set to have substantially the same thickness. Further, the first and second invert segments 3 and 4 are basically capable of staggered arrangement as shown in FIGS. 1 and 4, and the same segment can be used in the opposite direction. As a result, only one formwork is required and the cost is low.

The groove portion 5 is formed by contacting the ends of the first groove piece 11 and the second groove piece 13 with each other. In the first invert segment 3 and the second invert segment 4, the depth of the groove portion 5 is set deep by setting the thickness of the first groove piece 11 and the second groove piece 13 to be substantially the same as the thickness of the main bodies 3a and 4a. The amount of water in the canal can be secured.
It is preferable that the groove portion 5 has a bottom surface formed in a substantially extended line shape of the inner peripheral surfaces of the main bodies 3a and 4a. When the groove portion 5 is formed thinner than the thickness of the main bodies 3a and 4a, the depth of the groove portion 5 is increased but the strength of the segment is reduced, and when formed thicker than the main bodies 3a and 4a, the strength of the segment is increased but the strength of the groove portion 5 is increased. The depth becomes smaller.

Here, the arc length of each segment including the invert segments 3 and 4 is set to about 3 m for the convenience of underground transportation. When the groove portion 5 is formed by a one-piece invert segment as in the prior art, if the groove portion 5 is made higher (deeper), the arc length becomes longer than 3 m and the weight increases, which is inconvenient for transportation. On the other hand, if the groove length is designed to be high by keeping the arc length within 3 m, the first ridge 10 and the second ridge 12 will be high, and the lengths of the main bodies 3a and 4a will be substantially the same, and they will be staggered. Can not be. Moreover, since the height (thickness) of the raised portion of one invert segment increases and the weight increases, it is necessary to increase the ability of the erector to assemble this.
On the other hand, when the groove portion 5 is formed by abutting the first invert segment 3 and the second invert segment 4 as in the present embodiment, a zigzag-arrangable shape with an arc length of about 3 m is obtained, and the width of the groove portion 5 is increased. There is an advantage that there is a choice and flexibility regarding height and height.

The groove 5 constitutes a water channel formed at the bottom of the tunnel 1 with a water channel, and when used as a sewer tunnel, for example, when the amount of water is small, sewage can be collected and flowed into the groove 5. Without the grooves 5, sewage is dispersed at the bottom of the segment ring 2 and is difficult to flow. By forming the groove portion 5, it is possible to prevent sewage from flowing into the first and second inspection corridors 10b, 12b and the like where workers walk.
In the first embodiment, the first groove pieces 11 of the first invert segment 3 and the second groove pieces 13 of the second invert segment 4 are set to have substantially the same length in the circumferential direction. Moreover, the groove portion 5 is formed in a substantially U-shaped or U-shaped cross section, and the first and second invert segments 3 and 4 are installed so that the water channel of the groove portion 5 is located at the center of the bottom portion of the tunnel 1. The first invert segment 3, the second invert segment 4, the segment 7, and the key segment 8 are primary lining segments, and are manufactured in advance in a factory.

The length of the main body 3a of the first invert segment 3 is set to be longer than the length of the main body 4a of the second invert segment 4, but the length may be the same, or the length of the main body 4a of the second invert segment 4 may be set longer. May be longer.
The tunnel 1 with a water channel is configured by sequentially connecting the segment rings 2 with an inter-ring joint, and a groove portion 5 continuously flows to the bottom portion thereof. In each groove 5 of each segment ring 2, as shown in FIG. 3, a waterproof sheet 15 for preventing water leakage is installed on the inner surface of the groove 5 continuous in the axial direction of the tunnel 1 in order to prevent water leakage.

The waterproof sheet 15 has a bottom surface of the groove portion 5, that is, a bottom surface 15a that abuts the first groove piece 11 and the second groove piece 13, and side walls 15b on both sides that abut the standing walls 10a and 12a. Are formed in the longitudinal direction and are continuously formed in the longitudinal direction. The height of the side wall 15b of the waterproof sheet 15 extends to the upper ends of the standing walls 10a and 12a, but the height may be halfway.
The waterproof sheet 15 is made of, for example, a synthetic resin sheet or a vinyl sheet, and may be a resin molded product. Alternatively, the waterproof sheet 15 may be a type of resin that is cured by applying heat. Alternatively, instead of the waterproof sheet 15, polymer cement mortar, resin mortar or the like is applied to the groove 5 with a trowel or sprayed to form a waterproof thin layer having a substantially U-shaped or U-shaped cross section as a waterproof layer. You may.
When connecting the plurality of waterproof sheets 15 to each other, it is preferable to form the connecting portion so as to be on the bottom surface of the groove portion 5, and the joint is watertightly sealed with mortar, an adhesive or the like.

The tunnel 1 with a waterway according to the first embodiment has the above-mentioned configuration, and the assembly method will be described next.
When assembling the tunnel 1 with a water channel, first, the first invert segment 3 and the second invert segment 4 are installed at the bottom. At that time, the first groove piece 11 of the first invert segment 3 and the second groove piece 13 of the second invert segment 4 are abutted against each other so that the groove portion 5 is located at the lowest bottom.

Further, the other segments 7 are pushed into both sides of the first and second invert segments 3 and 4 by the erector of the shield device and the propulsion jack, and the joint surfaces are connected by the inter-segment joints. Each segment of the existing segment ring 2 and the main girder surfaces are connected to each other by an inter-ring joint. Finally, the key segments 8 are fitted between the top segments 7 and are connected by the intersegment joints and ring joints.
In this way, the segment rings 2 are sequentially connected to construct the tunnel 1, and the tunnel 1 and the groove portion 5 are graded from the upstream side to the downstream side. As shown in FIG. 3, the waterproof sheet 15 is installed on the continuous groove portion 5 at the bottom of the tunnel 1 after the construction. The waterproof sheet 15 is adhered to the bottom surface of the groove 5 and the standing walls 10a and 12a, and the joints of the plurality of waterproof sheets 15 are water-tightly sealed with mortar or adhesive.

  Further, during the construction of the tunnel 1 with a water channel, the first inspection corridor 10b and the second inspection corridor 12b can be used as a traveling path of a carrier truck used for transporting materials and equipment, in which case the groove 5 serves as a guide. Can be used. The segment-to-segment joint and the ring-to-ring joint may be joints having appropriate configurations, but it is desirable that the segment-to-segment joint be a cotter joint and the ring-to-ring joint be a shaft insertion joint, for example.

When the tunnel 1 with a water channel constructed in this manner is used as, for example, a sewer tunnel, sewage such as sewage flows downstream on the waterproof sheet 15 in the groove 5. For example, on a sunny day or the like, rainwater does not flow in, so the amount of water in the tunnel 1 is small and it is difficult to flow, but by collecting sewage in the groove portion 5, a water flow can be secured. Since the waterproof sheet 15 is installed on the surface of the groove 5, it is possible to prevent the sewage flowing in the groove 5 from leaking into the ground through the joint between the first and second invert segments 3 and 4.
When a worker or the like performs maintenance and inspection work in the tunnel 1, since a small amount of sewage is collected in the groove 5, it is possible to walk through the first inspection gallery 10b and the second inspection gallery 12b in which sewage does not flow. it can. Further, when rainwater or the like flows in and the amount of water in the tunnel 1 increases, the groove 5 overflows and the sewage also flows to the first inspection corridor 10b and the second inspection corridor 12b above it.

As described above, according to the tunnel 1 with a water channel according to the first embodiment, the groove portion 5 can be formed by connecting the first groove piece 11 and the second groove piece 13 of the first and second invert segments 3 and 4. As compared with the case where the groove portion is formed by the one-piece invert segment in the tunnel 1 having the same inner diameter, the groove portion 5 having a larger depth and volume can be formed, so that a larger amount of flowing water can be flowed.
Further, since the bottom surface of the groove portion 5 is formed on the extension line of the inner peripheral surface of each of the segments 7 and 8 for the primary lining, the strength of the first and second invert segments 3 and 4 and the depth of the groove portion 5 are set. Can be secured.

Moreover, since the groove 5 and the waterproof sheet 15 are installed at the bottom of the tunnel 1, it is possible to prevent sewage flowing in the groove 5 from leaking from the joint between the first and second invert segments 3 and 4.
Since the first and second invert segments 3, 4, the segment 7, and the key segment 8 are manufactured in advance in the factory, the construction period on site can be shortened. Further, during the tunnel construction, the first inspection corridor 10b and the second inspection corridor 12b on both sides of the groove 5 can be used as a passage for construction vehicles. That is, at the time of construction of the circular tunnel 1, an H-shaped steel material is passed to the lower part to convey materials and the rail is laid on the H-shaped steel material. However, even if this H steel is not laid, the first and second invert segments 3 , 4 of the first inspection corridor 10b and the second inspection corridor 12b can be used for railroad equipment.

  The tunnel 1 with a waterway according to the first embodiment of the present invention has been described above in detail. However, the present invention is not limited to the above-described embodiment, and appropriate changes and substitutions are made without departing from the gist of the present invention. Etc. are possible and all of them are included in the present invention. Other embodiments and modifications of the present invention will be described below, but the same or similar parts and members as those of the above-described embodiment will be denoted by the same reference numerals and description thereof will be omitted.

Next, a tunnel 1A with a water channel according to a second embodiment of the present invention will be described with reference to FIGS. 4 and 5.
4 and 5, the tunnel 1A with a water channel has substantially the same configuration as each segment of the tunnel 1 with a water channel according to the first embodiment, and is different in the invert segments 20 and 21 forming the groove portion 19.
In the first invert segment 20 in the second embodiment, a first ridge portion 23 having a substantially triangular cross-section is formed at a central portion in the circumferential direction of a main body 20a having a substantially arc plate shape, and one end portion following the first ridge portion 23 is formed. A first groove piece 24 having substantially the same thickness as the main body 20a is formed. The first raised portion 23 has a standing wall 23a that rises substantially vertically from the first groove piece 24, and a first inspection gallery 23b that forms a horizontal plane perpendicular to the standing wall 23a. The standing wall 23a and the first groove piece 24 form a first recess having a substantially L-shaped cross section.

Further, the second invert segment 21 is formed with a second raised portion 25 that is raised in a substantially triangular cross-section on one end side of the main body 21 a having a substantially arc plate shape on the first invert segment 20 side. A second groove piece 26 having substantially the same thickness as that of the main body 21a is formed at one end of the subsequent first invert segment 20 side. The second raised portion 25 has a standing wall 25a that stands substantially vertically from the second groove piece 26, and a second inspection corridor 25b that forms a horizontal plane perpendicular to the standing wall 25a. The standing wall 25a and the second groove piece 26 form a second recess having a substantially L-shaped cross section.
The first raised portion 23 and the second raised portion 25 are set so that the first inspection corridor 23b and the second inspection corridor 25b are set at substantially the same height so that a worker or the like can pass through for maintenance and repair.

The groove portion 19 is formed by the ends of the first groove piece 24 and the second groove piece 26 contacting each other, and the groove portion 19 is installed at the lowest bottom of the tunnel 1A. Moreover, the first groove piece 24 is formed to have a larger circumferential length than the second groove piece 26, while the main body 21a of the second invert segment 21 is longer than the main body 20a of the first invert segment 20. It is formed into a shape.
When assembling and constructing the tunnel with water passage 1A, as shown in FIG. 5, in one segment ring 2, the first invert segment 20 is installed on the left side, and the second invert segment 21 is installed on the right side. The groove portion 19 is formed by bringing the ends of the one groove piece 24 and the second groove piece 26 into contact with each other. Then, in the next segment ring 2, the second invert segment 21 is installed on the left side, and the first invert segment 20 is installed on the right side to form the groove portion 19.

In this way, in each segment ring 2 of the tunnel 1A with a water channel, the first invert segment 20 and the second invert segment 21 are alternately installed in opposite directions centering on the groove portion 19, so that the first groove piece 24 forming the groove portion 24 is formed. And the second groove pieces 26 are alternately arranged, and the joints thereof are alternately arranged in a staggered manner. Moreover, the groove portions 19 are formed in a substantially linear array on the bottom portion of the tunnel 1A. Therefore, the installation structure of the groove portion 19 has high strength.
In the groove portion 19, for example, a synthetic resin waterproof sheet 28, which is wound in a roll shape and has a highly flexible band shape, is stretched and installed. The waterproof sheet 28 is installed by being pushed into the groove portion 19, so that the waterproof sheet 28 is bent along the bottom surface of the groove portion 19 and the standing walls 23a and 25a in a U-shape or a U-shape. Sewage flows on the waterproof sheet 28 in the groove 19. Also in this embodiment, the seams of the waterproof sheet 28 are connected by an adhesive, mortar, or the like. The waterproof sheet 28 may be fixed to the groove 19 with an adhesive or the like.

In addition, in each of the above-described embodiments, the depths of the groove portions 5 and 19 are set on the extension lines of the inner peripheral surfaces of the main bodies 3a, 4a, 20a, and 21a, but the present invention is not limited to this. For example, the thickness of the first groove pieces 11, 24 and the second groove pieces 13, 26 may be formed to be larger than the thickness of the main bodies 3a, 4a, 20a, 21a. Even in these cases, the decrease in the volume of the groove portion 5 can be suppressed by increasing the circumferential lengths of the first groove pieces 11 and 24 and the second groove pieces 13 and 26. Further, strength can be ensured even if the thickness of the first groove pieces 11, 24 and the second groove pieces 13, 26 is made smaller than the thickness of the main bodies 3a, 4a, 20a, 21a.
Further, in the above-described first and second embodiments, the tunnels with water channels 1 and 1A have been described as being applied to the sewer tunnel, but the present invention is not limited to the sewer tunnel, and may be, for example, a common groove or a railway tunnel. The present invention can be applied to various tunnels provided with an appropriate water channel such as a road tunnel.

1, 1A Tunnel with water channel 2 Segment ring 3, 20 First invert segment 4, 21 Second invert segment 5, 19 Groove portion 10, 23 First raised portion 10a, 12a, 23a, 25a Standing wall 12, 25 Second raised portion 10b , 23b First inspection hall 12b, 25b Second inspection hall
11, 24 First groove piece 13, 26 Second groove piece 15, 28 Waterproof sheet

Claims (4)

In a tunnel with a water channel that connects segment rings that connect multiple lining segments along the axial direction,
A first invert segment installed at the bottom of the segment ring and having a first recess formed at one end,
A second invert segment, which is installed at the bottom of the segment ring and has a second recess formed in one end to abut the first recess,
And a groove portion formed by connecting the first recess and the second recess as a water channel.   The tunnel with a water channel according to claim 1, wherein the groove portion has a bottom surface formed on an extension of the inner peripheral surface of the lining segment.   The tunnel with a water channel according to claim 1 or 2, wherein a waterproof sheet or a waterproof layer for preventing water leakage is installed on the inner surface of the groove.   The first concave portion and the second concave portion have different circumferential lengths, and in the axial direction of the tunnel, the first invert segment and the second invert segment are alternately arranged in opposite directions centering on the groove portion. The tunnel with a waterway according to any one of items 1 to 3.

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