JP2021139176A - Hexagonal segment and construction method of lining body of shield tunnel - Google Patents

Abstract

To provide a hexagonal segment by which high joining rigidity between the connected hexagonal segments can be easily obtained, and which is excellent in the workability of a variety of kinds of work accompanied by connection.SOLUTION: A reinforced-concrete hexagonal segment 12 comprises a pair of V-shaped peripheral joining faces 17 formed of a pit-face side joining face 13, a pit-mouth side joining face 14, a pit-face side oblique joining face 15 and a pit-mouth side oblique joining face 16 which are arranged in parallel with one another, and forms a lining body of the shielded tunnel by being continuously assembled in an axial direction and a peripheral direction of the tunnel. A plurality of oblique bolt insertion holes 23a, 23b over the pit-mouth side oblique joining face 16 from the pit-face side joining face 13 are formed at both sides of an axial center line L1 which is formed along the axial direction of the tunnel, and the plurality of oblique bolt insertion holes 23 are formed in a state that the holes are aligned in a thickness direction of the hexagonal segment 12.SELECTED DRAWING: Figure 1

Description

The present invention relates to a hexagonal segment and a joint structure of hexagonal segments, and in particular, a hexagonal segment used for forming a shield tunnel lining body by continuously assembling in the axial direction and the circumferential direction of the tunnel. And a method of constructing a shield tunnel lining using hexagonal segments.

As a method of constructing various tunnels in urban areas and plains, a shield method using a shield excavator is widely adopted. In the shield method, the face of the tip of the shield excavator is pressed by mud, muddy water, pressure, etc. while excavating the ground with a cutter, and the tunnel is connected behind the shield excavator in the axial and circumferential directions. By sequentially assembling the segments, a lining body covering the inner peripheral surface of the tunnel is formed, and the shield jack is pressed against the front end of the assembled lining body to obtain a reaction force and reach from the starting shaft. It is a construction method in which a tunnel is constructed underground toward the shaft.

In recent years, from the viewpoint of improving the efficiency of construction, the segment constituting the lining body covering the inner peripheral surface of the tunnel is provided with a hexagonal planar shape instead of the commonly used segment having a rectangular planar shape. A shield tunneling method using hexagonal segments may be adopted (see, for example, Patent Document 1 and Patent Document 2). The hexagonal segment is a V-shaped diagonal joint surface arranged in a V shape so as to connect the joint surfaces on the face side and the joint surface on the wellhead side arranged in parallel and the ends on both sides of these joint surfaces. It also has a pair of V-shaped circumferential joint surfaces composed of an oblique joint surface on the wellhead side (see FIG. 1 (a)). The hexagonal segment is a hexagonal segment that is assembled following the front side of the tunnel in the excavation direction on the face side joint surface and the face side diagonal joint surface of the hexagonal segment that is assembled prior to the rear side in the tunnel excavation direction. While superimposing the wellhead side joint surface and the wellhead side diagonal joint surface, the equiped trapezoidal part, which is the front half of the tunnel in the digging direction, of each hexagonal segment is alternately projected to form the tunnel. They are arranged in a honeycomb shape in the axial direction and the circumferential direction and are sequentially assembled (see, for example, FIGS. 4 to 6 of Patent Document 3).

In the shield method using hexagonal segments, the shield jack is pressed against the face-side joint surface of the equilateral pedestal-shaped parts that protrude alternately in the hexagonal segments, and the shield excavator is dug while taking the reaction force. In parallel with this, the work of assembling the subsequent hexagonal segment can be performed in the area between the adjacent equilateral trapezoidal portions against which the shield jack is pressed. By continuously digging the shield digger while assembling the hexagonal segment, without interrupting the process of digging the shield digger for each ring and assembling the segments like the shield method used. , It is possible to carry out shield tunneling efficiently.

Furthermore, in the shield method using hexagonal segments, the connection between adjacent hexagonal segments is made by connecting the facet side joint surface, the wellhead side joint surface, the face side diagonal joint surface, and the end face by the wellhead side diagonal joint surface. Since it is performed using connecting bolts that are attached through the space (see, for example, Patent Document 1, Patent Document 2, and Patent Document 3), it is formed on the inner peripheral surface of the lining body by the rectangular segment. It is possible to prevent unevenness due to a bolt box or the like for fastening the connecting bolts, which appears, from being formed on the inner peripheral surface of the lining body by the hexagonal segment. Further, since this makes it possible to keep the inner peripheral surface of the lining body in a smooth state, it is preferable to further perform a secondary lining inside the lining body made of hexagonal segments having an anticorrosion layer on the inner side surface. There is no need to construct, and the inner peripheral surface of the lining body made of hexagonal segments is used as it is as the inner peripheral surface of the tunnel. It will also be possible to effectively utilize it as a tunnel for the storage area where the waste is stored.

Japanese Patent No. 2596666 Japanese Unexamined Patent Publication No. 9-273395 Japanese Patent No. 3253870 Japanese Patent No. 3235494

By the way, in shield tunnels constructed deep underground and shield tunnels with large diameters, the thickness and weight of the hexagonal segments used increase, and a larger shearing force is applied to the joints between the hexagonal segments. A strong tunneling means that can withstand is needed.
As such a connecting means, it is conceivable to use a connecting bolt having a large cross-sectional area, but as the weight of the connecting bolt increases, the connecting bolt is manually conveyed or inserted into the bolt insertion hole. The work efficiency of the connection work is reduced, for example, it becomes difficult to do so.

In addition, as a bolt insertion hole for inserting a connecting bolt, an oblique bolt insertion hole is inserted into the hexagonal segment from the face side joint surface to the wellhead side diagonal joint surface and substantially parallel to the face side diagonal joint surface. It is known that the joint surface on the face side and the joint surface on the wellhead side are communicated with each other to form an axial bolt insertion hole through which a connecting bolt is inserted substantially parallel to the axial direction of the tunnel (Patent Document 2). (See Fig. 1).
However, since the positions of the axial bolt insertion holes overlap when connecting the hexagonal segments having the same configuration in the axial direction of the tunnel, the hexagonal segment having the axial bolt insertion holes can be installed. The range is limited. Therefore, it is conceivable to use a long bolt that penetrates a plurality of hexagonal segments, but it is not easy to insert a long bolt through a plurality of hexagonal segments, and each of them is long. Bolts also have increased weight and length. Therefore, the work efficiency of the connection work between the segments is lowered.

Further, as a segment made of steel or ductile cast iron, a joint plate arranged in a joint portion between segments is known to have a plurality of bolt insertion holes provided in the thickness direction of the segment (Patent Document 4). However, in addition to being a segment made of steel or ductile cast iron, the plan view shape is not hexagonal, and in Patent Document 4, the technique of Cited Document 4 is applied to a hexagonal segment mainly composed of concrete. There is no mention of.

Further, the present inventors have defined bolt insertion holes extending from the face side joint surface to the wellhead side diagonal joint surface in the circumferential direction of the tunnel on both sides of the axial center line along the axial direction of the tunnel in the hexagonal segment. It was also considered to form a plurality of pieces by arranging them at intervals of the above, but in that case, it was found that the workability such as when inserting the connecting bolts was greatly reduced.

Therefore, an object of the present invention is a hexagonal segment and a shield using the hexagonal segment, which can easily obtain high bonding strength between connected hexagonal segments and are also excellent in workability of various operations associated with the connection. The purpose is to provide a method for constructing a tunnel lining.

In the present invention, the face side joint surface and the tunnel side joint surface arranged parallel to each other and the face side diagonal joint surface arranged in a V shape so as to connect the ends on both sides of these joint surfaces. A hexagon made of reinforced concrete, which is provided with a pair of V-shaped circumferential joint surfaces consisting of an oblique joint surface on the wellhead side and is assembled in series in the axial and circumferential directions of the tunnel to form a shield tunnel lining. A plurality of oblique bolt insertion holes extending from the face side joint surface to the wellhead side diagonal joint surface are formed on both sides of the axial center line arranged along the axial direction of the tunnel, which is a square segment. The above object is achieved by providing the hexagonal segment in which the plurality of oblique bolt insertion holes are formed so as to be arranged in the thickness direction of the hexagonal segment.

In the hexagonal segment of the present invention, as the plurality of oblique bolt insertion holes, an outer oblique bolt insertion hole formed at a position close to the outer peripheral surface of the hexagonal segment and an inner peripheral surface of the hexagonal segment are close to each other. It has an inner oblique bolt insertion hole formed at a position, and the position of the opening on the face side joint surface side in the outer oblique bolt insertion hole is the face side joint in the inner oblique bolt insertion hole. The length of the diagonal bolt insertion hole on the outer side and the length of the diagonal bolt insertion hole on the inner side are substantially the same with respect to the position of the opening on the surface side. Is preferable. Further, in the hexagonal segment of the present invention, the guide convex portion or the guide concave portion that engages with the guide concave portion or the guide convex portion formed on the face side diagonal joint surface of the other hexagonal segment is formed on the wellhead side diagonal joint surface. The openings of the plurality of oblique bolt insertion holes on the wellhead side diagonal joint surface side are located in the region between the guide concave portion and the guide convex portion in the longitudinal direction of the wellhead side diagonal joint surface. It is preferable to do so.

Further, in the present invention, the face side joint surface and the wellhead side joint surface arranged in parallel with each other and the face side diagonal joint arranged in a V shape so as to connect the ends on both sides of these joint surfaces. A lining body of a shield tunnel is formed by continuously assembling hexagonal segments including a pair of V-shaped circumferential joint surfaces consisting of a surface and an oblique joint surface on the wellhead side in the axial direction and the circumferential direction of the tunnel. , A method for constructing a lining body of a shield tunnel, wherein the hexagonal segment according to any one of claims 1 to 3 is used as the hexagonal segment, and a plurality of hexagons arranged in advance. In the first step of moving the subsequent hexagonal segment by the segment transfer device having the segment holding portion in the equilateral trapezoidal recess formed by the segment, to the face-side joint surface of the subsequent hexagonal segment. , The subsequent hexagon by pressing against the face-side joint surface of each hexagonal segment and pressing a part of the shield jacks among a plurality of shield jacks for advancing the shield excavator by the reaction force thereof. After the second step and the second step in which the equilateral trapezoidal portion on the wellhead side of the segment is brought into close contact with the recess, a plurality of oblique bolt insertion holes are provided on both sides of the axial center line in the subsequent hexagonal segment. Provided is a method for constructing a shield tunnel lining body, comprising a third step of inserting a connecting bolt into each of the above and binding the subsequent hexagonal segment to the previously arranged hexagonal segment. It is a thing.

Further, the method of constructing the lining body of the shield tunnel of the present invention is carried out in a state where the subsequent hexagonal segment is held by the holding portion of the transport device of the segment, and the hexagonal segment is held by the holding portion after the third step. It is preferable to include a fourth step of separating from the portion. Further, in the method for constructing the lining body of the shield tunnel of the present invention, it is preferable that the hexagonal segments are tightly bound to each other in the third step by an automatic fastening device conveyed by the conveying device together with the hexagonal segments. .. Further, in the method of constructing the lining body of the shield tunnel of the present invention, as the hexagonal segment, the position of the opening on the face side joint surface side in the outer oblique bolt insertion hole is the position of the opening in the inner oblique bolt insertion hole. It is shifted toward the diagonal joint surface side on the face side with respect to the position of the opening on the joint surface side on the face side, and the length of the diagonal bolt insertion hole on the outer side and the length of the diagonal bolt insertion hole on the inner side are substantially the same. It is preferable to use a common connecting bolt having the same length as the connecting bolt to be inserted into the outer oblique bolt insertion hole and the inner oblique bolt insertion hole.

According to the method for constructing the hexagonal segment and the lining body of the shield tunnel of the present invention, high bonding strength can be easily obtained between the hexagonal segments to be connected, and the workability of various operations associated with the connection is also excellent. For example, even when a thick lining body or a lining body having a large diameter is formed as a lining body of a shield tunnel, efficient connection work can be performed.

It is a figure which shows an example of the hexagonal segment which concerns on this invention. FIG. A side view, (d) is a view of (a) viewed from the G direction. It is a partially cutaway perspective view which shows an example of the lining body of the shield tunnel formed by using the manufacturing method of the lining body of the hexagonal segment and the shield tunnel of this invention. It is explanatory drawing of preferable arrangement of an oblique bolt insertion hole, (a) is an enlarged view of a part of the lower half part of the face side joint surface shown in FIG. 1 (b) seen from the normal direction, (b) is an enlarged view. , Is an enlarged view of the wellhead side oblique joint surface shown in FIG. 1D as viewed from the normal direction. It is explanatory drawing of the oblique bolt insertion hole of the hexagonal segment shown in FIG. 1, (a) is the sectional view before inserting the connecting bolt, (b) is the sectional view with the connecting bolt inserted. be. (A) to (c) are explanatory views of the steps of assembling a plurality of hexagonal segments to form a lining body.

Hereinafter, the present invention will be described based on the preferred embodiment thereof.
As shown in FIGS. 1 (a) to 1 (d), the hexagonal segment 12 according to the preferred embodiment of the present invention includes the face side joint surface 13 and the wellhead side joint surface 14 arranged in parallel with each other, and these. A pair of V-shaped circumferential joint surfaces 17 composed of an oblique joint surface 15 on the face side and an oblique joint surface 16 on the wellhead side, arranged in a V shape so as to connect the ends on both sides of the joint surfaces 13 and 14, respectively. A segment made of reinforced concrete having a hexagonal plan view shape. The hexagonal segment made of reinforced concrete is not limited to the one made of reinforced concrete as a whole, and may be reinforced with a reinforcing plate made of steel plate or the like at appropriate places. The hexagonal segment 12 has a hexagonal outer peripheral surface 20 arranged on the outer side in the radial direction of the tunnel and a hexagonal inner peripheral surface 22 arranged on the inner side in the radial direction of the tunnel, and covers the entire area. It is a plate-like body having a substantially constant thickness, and the cross section in the direction along the face-side joint surface 13 and the wellhead-side joint surface 14 has an arc-shaped shape having a radius of curvature corresponding to the radius of the tunnel. (See FIGS. 1 (b) and 1 (c)). The hexagonal segment 12 can be used for constructing a shield tunnel lining 11 having an arbitrary thickness and diameter, but is particularly suitable for constructing a large tunnel lining 11 and has a face-side joint surface 13. The radius of curvature of the outer peripheral surface 20 in the cross section in the direction along the tunnel entrance side joint surface 14 is, for example, 0.9 to 17.45 m, preferably 2.0 to 4.0 m. It is also suitable for cases where particularly high pressure resistance is required, such as in the deep underground, and the thickness T (distance between the outer peripheral surface and the inner peripheral surface) of the hexagonal segment 12 is, for example, 20 to 90 cm. , It is preferably 30 to 60 cm.

Then, the hexagonal segments 12 are for a storage area for temporarily storing rainwater, for example, by connecting a plurality of the hexagonal segments 12 in a series in the axial direction (digging direction) X and the circumferential direction Y of the tunnel and assembling them in a honeycomb shape. A lining body 11 (see FIG. 2) that covers the inner peripheral surface of a shield tunnel such as a shield tunnel can be formed. The angle θ between the face side diagonal joint surface 15 and the wellhead side diagonal joint surface 16 on each V-shaped circumferential joint surface 17 in the hexagonal segment 12 is 120 ° (FIG. 1 (a)). reference). As a result, the plurality of hexagonal segments 12 are placed on the face side diagonal joint surface 15 and the face side joint surface 13 of the preceding hexagonal segment 12, and the wellhead side diagonal joint surface 16 and the hexagonal segment 12 which are subsequently installed. The wellhead side joint surfaces 14 can be arranged in a honeycomb shape in the axial direction and the circumferential direction in a state of being sequentially overlapped without a gap (see FIG. 5).

As shown in FIG. 1, the hexagonal segment 12 according to the present embodiment is diagonally joined from the face side joint surface 13 to the wellhead side diagonally on both sides of the axial center line L1 arranged along the axial direction of the tunnel. A plurality of oblique bolt insertion holes 23 are formed over the surface 16. Further, as shown in FIG. 3, a plurality of oblique bolt insertion holes 23 provided on both sides of the axial center line L1 are formed so as to be aligned in the thickness direction Z of the hexagonal segment 12. The axial center line L1 is a virtual line that divides the distance between the tips of the pair of V-shaped circumferential joint surfaces in the hexagonal segment 12 into two equal parts, and is a virtual line that divides the distance between the tips of the pair of V-shaped circumferential joint surfaces into two equal parts. It is a virtual line arranged along the axial direction X. Both sides of the axial center line L1 are both sides of the axial center line L1 in the plan view of the hexagonal segment (see FIG. 1A).

With respect to the plurality of oblique bolt insertion holes 23 formed on both sides of the axial center line L1 of the hexagonal segment 12, the plurality of oblique bolts formed below the axial center line L1 shown in FIG. 1 (a). The insertion hole 23 will be described as an example. Hereinafter, a plurality of oblique bolt insertion holes formed on one side of the axial center line L1 and a plurality of oblique bolt insertion holes formed on the other side of the axial center line L1 are included. Also referred to as "plural diagonal bolt insertion holes". The hexagonal segment 12 shown in FIG. 1 has a shape that is line-symmetrical with respect to the axial center line L1.

As shown in FIGS. 1 and 3A, the hexagonal segment 12 according to the present embodiment has a plurality of oblique bolt insertion holes 23 formed at different positions in the thickness direction Z of the hexagonal segment 12. It has an oblique bolt insertion hole 23. More specifically, in the thickness direction Z, the inner oblique bolt insertion hole 23a formed at a position closer to the inner peripheral surface 22 and the outer side formed at a position closer to the outer peripheral surface 20 than the oblique bolt insertion hole 23a. It has an oblique bolt insertion hole 23a. The state in which the plurality of oblique bolt insertion holes 23 are arranged in the thickness direction Z of the hexagonal segment 12 means that at least the openings on the face side joint surface 13 side of the plurality of oblique bolt insertion holes 23 are in the thickness direction of the hexagonal segment. In addition to this, it is preferable that the openings of the plurality of oblique bolt insertion holes 23 on the wellhead side oblique joint surface 16 side are arranged in the thickness direction of the hexagonal segment. Here, the expression "arranged" includes the case where there is a slight deviation in the range in which the effect of the present invention is exhibited.

As shown in FIG. 4A, the plurality of oblique bolt insertion holes 23 in the hexagonal segment 12 according to the present embodiment each have an inner peripheral surface having substantially the same diameter as the outer peripheral surface of the connecting bolt 24 to be inserted. A fastening recess 23c for fastening the head of the connecting bolt 24 to the end of the diagonal bolt insertion hole 23 on the face side joint surface 13 side has a main body portion 23 m, and the opening thereof is the face side joint surface. It is formed by opening at 13. The main body 23m is formed by burying a long cylindrical sheath pipe 23s in reinforced concrete concrete. The bottom of the fastening recess 23c is reinforced by a bearing plate 23h made of a steel plate or the like.

Even when the oblique bolt insertion hole 23 has a fastening recess 23c at the end on the face side joint surface 13 side as in the present embodiment, the center points Ca and Cb of the opening of the oblique bolt insertion hole 23 are still present. As shown in FIG. 4A, it is an intersection of the axis center line g of the main body portion 23 m and the opening surface of the fastening recess 23c that opens to the face side joint surface 13. However, since the deviation between the intersection and the center point of the opening surface of the fastening recess 23a is often small, the center point of the opening surface of the fastening recess 23a unless it is clear that the deviation is large. May be set as the center points Ca and Cb of the opening of the oblique bolt insertion hole 23.

The oblique bolt insertion hole 23 in the present embodiment also has a recess 23d having a cross-sectional area larger than that of the main body portion 23 m at the end portion on the wellhead side oblique joint surface 16 side. Even when the oblique bolt insertion hole 23 has a recess 23d having a shape that does not follow the outer peripheral surface of the connecting bolt through which the inner peripheral surface is inserted, the oblique bolt insertion hole 23 is provided at the end on the side of the diagonal joint surface 16 on the wellhead side. As shown in FIG. 4B, the center points Ca'and Cb'of the opening of the above are the intersections of the axis center line g of the main body 23m and the opening surface of the recess 23d opening in the wellhead side diagonal joint surface 16. Is. However, since the deviation between the intersection and the center point of the opening surface of the recess 23d is usually small, the center point of the opening surface of the recess 23d is set unless it is clear that the deviation is large. , The center points Ca'and Cb'of the opening of the oblique bolt insertion hole 23 may be used.

As shown in FIG. 3A, the hexagonal segment 12 is formed at a position close to the inner peripheral surface 22 of the hexagonal segment as a plurality of oblique bolt insertion holes formed on both sides of the axial center line L1. It has an inner oblique bolt insertion hole 23a and an outer oblique bolt insertion hole 23b formed at a position close to the outer peripheral surface 20 of the hexagonal segment, and is located on the face side joint surface 13 side of the outer oblique bolt insertion hole 23b. The position of the opening is shifted toward the face side diagonal joint surface 15 side with respect to the position of the opening on the face side joint surface 13 side in the inner diagonal bolt insertion hole 23a, and the length of the outer diagonal bolt insertion hole 23b and the inner side. The lengths of the oblique bolt insertion holes 23a are substantially the same.

As a result, connecting bolts having the same length can be preferably used as the connecting bolts that are inserted into the oblique bolt insertion holes 23a and used to fasten the segments. Further, it becomes easy to use a common sheath tube 23s or the like used for forming the plurality of oblique bolt insertion holes 23a and 23b. It is not essential in the present invention to use connecting bolts having a common length, but the fact that connecting bolts having a common length can be used means that different connecting bolts are used for each oblique bolt insertion hole. Compared to the case, it is possible to reduce various burdens such as insertion work, carry-in work, and material management.

As a method of making the length of the outer oblique bolt insertion hole 23b and the length of the inner oblique bolt insertion hole 23a substantially the same, a method of shifting the positions of the openings on the wellhead side diagonal joint surface 16 side of a plurality of connecting bolts is also considered. However, at least the position of the opening on the face side joint surface 15 side can be shifted so that the position of the opening on the wellhead side diagonal joint surface 16 side is not shifted or the degree of shift is suppressed. Is concentrated near the central portion in the longitudinal direction of the diagonal joint surface 16 on the wellhead side, and is preferable from the viewpoint of imparting excellent strength to the lining body formed by assembling the hexagonal segments 12 in the circumferential direction and the axial direction of the tunnel. L2 shown in FIG. 3A is the length of deviation of the oblique bolt insertion hole 23b required for that purpose. The length of the connecting bolt 24 is the distance between the center points Ca and Cb of the opening on the face side joint surface 13 side and the center points Ca'and Cb'of the opening on the wellhead side diagonal joint surface 16 side. be.

The pair of face-side oblique joint surfaces 15 of the hexagonal segment 12 are provided with a plurality of female screw holes 15a and 15b corresponding to the plurality of oblique bolt insertion holes 23 at the central portions thereof. The female screw holes 15a and 15b are provided, for example, by embedding a female screw anchor. The female screw holes 15a and 15b are formed when the diagonal joint surface 16 on the face side of the hexagonal segment 12 installed in advance is overlapped with the diagonal joint surface 16 on the wellhead side of the hexagonal segment 12 installed subsequently. , The diagonal bolt insertion hole 23 provided in the subsequent hexagonal segment 12 is linearly communicated with the end side opposite to the fastening recess 23a. As a result, the connecting bolts 24 are inserted into and fastened to the diagonal bolt insertion holes 23 and the female screw holes 15a and 15b that are communicated with each other, thereby strengthening the adjacent hexagonal segments 12 arranged in a honeycomb shape. It becomes possible to connect to the honeycomb as a unit (see FIG. 2).

Further, in the hexagonal segment 12 of the present embodiment, for positioning, the hexagonal segment 12 on the face side and the oblique joint surface 16 on the wellhead side are used for positioning, as in the case of the hexagonal segment (hexagonal segment) described in Japanese Patent No. 3253870. The guide convex portion 25a and the guide concave portion 25b of the above are provided respectively. These positioning guide convex portions 25a and guide concave portions 25b are hexagons that are installed in advance when the next hexagonal segment 12 is installed after the hexagonal segment 12 that is installed in advance. Following the equiped trapezoidal spacing portion (recess) between the equipedular trapezoidal portions adjacent to the circumferential direction Y and protruding forward in the excavation direction X by the segment 12 (see FIG. 5 (a)). It has a function of guiding the hexagonal segments 12 to be arranged so that they can be positioned with high accuracy and preventing the assembled hexagonal segments 12 from being displaced.

Further, the hexagonal segment 12 of the present embodiment is provided with a gripping hole 29 that allows the hexagonal segment 12 to be gripped by an assembly Elector device (not shown), for example, in the central portion of the inner side surface. In addition, a pair of lifting insert fittings 27 that enable the hexagonal segment 12 to be lifted are provided, for example, arranged in the side regions on both sides of the wellhead side joint surface 14.

Further, the hexagonal segment 12 of the present embodiment includes an inner peripheral groove 21a and an outer peripheral groove 21b provided over the entire circumference of the hexagonal segment 12 in a plan view at two locations separated in the thickness direction thereof. .. In the present specification, the plane of the hexagonal segment is the plane on the inner peripheral surface side of the hexagonal segment (see FIG. 1A). In the thickness direction Z of the hexagonal segment 12, the inner peripheral groove 21a is formed at a position closer to the inner peripheral surface 22 than the outer peripheral groove 21b. More specifically, in the hexagonal segment 1, the face side joint surface 13, the wellhead side joint surface 14, the face side diagonal joint surface 15, and the wellhead side diagonal joint surface 16 are shown in FIGS. 1 (a) to 1 (d). As described above, the outer peripheral groove 21b having a width of about 20 mm is formed so as to be continuous over the entire circumference of the hexagonal segment 12 at a distance of about 60 mm from the outer peripheral surface of the hexagonal segment 12. An inner peripheral groove 21a having a width of about 20 mm is formed so as to be continuous over the entire circumference of the hexagonal segment 12 at a distance of about 60 mm from the inner peripheral surface of the square segment 12. The inner peripheral groove 21a and the outer peripheral groove 21b are formed in parallel with each other so that the distance between them is substantially constant over the entire circumference of the hexagonal segment 12. In the inner peripheral groove 21a and the outer peripheral groove 21b, a sealing material 18 preferably made of a strip-shaped water-swellable sealing material is continuously provided over the entire circumference of the hexagonal segment 12 via an adhesive. It is provided as follows.
In the hexagonal segment 12 having the above-described configuration, the sealing material 18 is arranged in the inner peripheral groove 21a and the outer peripheral groove 21b, and a plurality of the hexagonal segments 12 are arranged in the axial direction (digging direction) X and the circumferential direction Y of the tunnel. By continuously assembling, it is possible to form a shield tunnel lining body 11 (see FIG. 2) having excellent water stopping performance that blocks the flow of water migrating from the inside to the outside and from the outside to the inside.

The hexagonal segments 12 according to the present embodiment can form a shield tunnel lining body 11 by connecting a plurality of the hexagonal segments 12 in series in the axial direction X and the circumferential direction Y of the tunnel and assembling them in a honeycomb shape. .. In order to connect a plurality of hexagonal segments 12 in a series in the axial direction (digging direction) X and the circumferential direction Y of the tunnel and assemble them in a honeycomb shape, for example, as shown in FIGS. The hexagonal segment 12 that is subsequently assembled to the face side joint surface 13 and the face side diagonal joint surface 15 of the hexagonal segment 12 that is assembled prior to the rear side of the excavation direction X, after the front side of the tunnel excavation direction X. While superimposing the wellhead side joint surface 14 and the wellhead side diagonal joint surface 16 respectively, the equipedular trapezoidal portion, which is the front half portion of the tunnel excavation direction X in each hexagonal segment 12, is alternately formed. While projecting, the plurality of hexagonal segments 12 are arranged in a honeycomb shape in the axial direction X and the circumferential direction Y of the tunnel and assembled in sequence.

Further, when the plurality of hexagonal segments 12 are sequentially assembled in the axial direction X and the circumferential direction Y of the tunnel, the hexagonal segment 12 assembled in advance alternately protrudes from the equipedular trapezoidal portion. The shield jack 26 is pressed against the face-side joint surface 13 at the tip of the above, and the shield excavator is dug while taking the reaction force. In the area between the portions, it is possible to carry out the work of assembling the subsequent hexagonal segment 12.

As an embodiment of the method for constructing the lining body of the shield tunnel of the present invention, a method for constructing the lining body 11 using the hexagonal segment 12 having the above-described configuration will be described. As shown in 5 (a), in the region between the equilateral trapezoidal portions adjacent to each other in the circumferential direction Y in which the shield jack 26 is pressed against the face-side joint surface 13, the shield jack 26 in the region between them is contracted. As a state, the hexagonal segment 12 to be installed subsequently is conveyed to the area between the segments by a segment transfer device (such as an erector device), and further, the hexagonal segment 12 to be installed subsequently is conveyed to the area between the sections first by the segment transfer device. The subsequent hexagonal segment 12 is moved to the equilateral trapezoidal recess 28 formed by the plurality of arranged hexagonal segments (first step). In the first step, the isopedical portion of the rear half of the hexagonal segment 12 to be assembled subsequently is inserted into the equipedular recess 28, and the wellhead existing in the equipedular portion is inserted. The side joint surface 14 and the wellhead side diagonal joint surface 16 are brought close to or in contact with the face side joint surface 13 and the face side diagonal joint surface 15 of the hexagonal segment 12 assembled in advance (FIG. 5 (a)). )reference).

After that, one of the three shield jacks 26, for example, one in the center, which is arranged in the area between the adjacent equilateral trapezoidal portions, is extended, and the shield jack 26 is followed by six. By pressing against the face-side joint surface of the square segment 12, the equiped trapezoidal portion of the rear half of the hexagonal segment 12 is brought into close contact with the recess 28 (second step). In the second step, the wellhead side joint surface 14 and the wellhead side diagonal joint surface 16 existing in the isopedical portion of the rear half of the hexagonal segment 12 to be assembled subsequently are assembled in advance. The square segment 12 is pressed against the face-side joint surface 13 and the face-side diagonal joint surface 15 to be brought into close contact with each other. More specifically, the hexagonal segment 12 to be subsequently assembled is held on both sides of the hexagonal segment 12 at the face-side joint surface 13 of the hexagonal segment 12 while maintaining the holding of the hexagonal segment 12 by the transfer device, preferably via the grip hole 29. In a state where the subsequent hexagonal segment 12 is pressed against the previously assembled hexagonal segment 12 by pressing the one shield jack 26 against the region located between the oblique bolt insertion holes. , A total of four or more connecting bolts 24 are inserted into each of the diagonal bolt insertion holes 23 provided on both sides of the face-side joint surface 13 of the subsequent hexagonal segment 12, and a plurality of connecting bolts 24 are inserted on each side. Using the connecting bolt 24 of the above, the hexagonal segment 12 arranged earlier is fastened (third step). In the third step, the connecting bolt 24 is inserted and tightened through the diagonal bolt insertion hole 23 of the subsequent hexagonal segment 12 and the female screw hole 15a of the hexagonal segment 12 installed in advance. By wearing them, the hexagonal segments 12 adjacent to each other are connected and integrated. By this third step, the subsequent hexagonal segment 12 is firmly connected to the previously installed hexagonal segment 12 via the connecting bolts 24 in which two or more, a total of four or more, are inserted on one side. Be tied up. At this time, in order to prevent the end portion on the face side from being lowered by the weight of the hexagonal segment 12, the connecting bolt 24 installed on the upper side of the hexagonal segment 12 may be strongly tightened within an allowable range.

Such work is performed in each region between adjacent projecting equipedular trapezoidal portions formed in the circumferential direction, and the hexagonal segment 12 newly installed in this manner is preceded. As the existing hexagonal segment 12 assembled in the above direction, the shield jack 26 is pressed against the joint surface 13 on the face side to dig the shield excavator while taking the reaction force, and in parallel with this, the shield jack 26 is moved. In the region between these hexagonal segments 12 pressed against each other, by repeating the work of assembling the subsequent hexagonal segments, a plurality of six hexagons arranged in a honeycomb shape in the axial direction X and the circumferential direction Y of the tunnel. The square segment 12 makes it possible to easily form the lining body 11 that covers the inner peripheral surface of the shield tunnel for the storage area, which preferably temporarily stores rainwater.

According to the hexagonal segment 12 according to the present embodiment and the method for constructing the shield tunnel lining body 11 using the hexagonal segment 12, diagonal bolts provided on both sides of the axial center line L1 in a thickness direction. Since a total of four or more connecting bolts 24 inserted through the insertion holes 23 can be inserted to bind the hexagonal segments together, high bonding strength is achieved between the hexagonal segments that are assembled in a honeycomb shape adjacent to each other. Is obtained. Moreover, the weight of each connecting bolt can be reduced as compared with the case of using a connecting bolt having a large cross section to increase the joining strength or the case of using an axial connecting bolt penetrating a plurality of hexagonal segments. Therefore, it is possible to easily construct a high-strength shield tunnel lining body in which hexagonal segments are joined to each other with high joint strength without deteriorating the handleability and work efficiency of connecting bolts.
Therefore, for example, it becomes easy to construct a shield tunnel or a large-diameter shield tunnel to be constructed deep underground by using a thick hexagonal segment or a heavy-weight hexagonal segment.

Further, as compared with the case where a plurality of oblique bolt insertion holes are arranged on both sides of the axial center line L1 of the hexagonal segment in the bending direction along the circumferential direction of the tunnel (direction of arrow Y1 in FIG. 3A). Therefore, it is easy to secure a wide area between the diagonal bolt insertion holes on both sides. Therefore, for example, as shown in FIG. 5 (c), some of the shield jacks 26 of the plurality of shield jacks that are brought into contact with the individual hexagonal segments in order to advance the shield excavator are brought into contact with or pushed. It is also easy to insert the connecting bolts 24 into the diagonal bolt insertion holes 23a and 23b provided on both sides of the axial center line L1 under the contacted state.

The third step of the method for constructing the lining body of the shield tunnel of the present invention may be performed after the partial shield jack 26 is separated from the subsequent hexagonal segment 12, but even in that case, the hexagonal shape is used. By arranging a plurality of bolt insertion holes in the thickness direction of the segment, a wide space can be secured in the portion facing the diagonal bolt insertion holes on both sides. For example, the space can be used to tilt the connecting bolt. Various tasks such as transporting the connecting bolt to the proper position for insertion into the bolt insertion hole, inserting the connecting bolt into the diagonal bolt insertion hole, and rotating the connecting bolt around the axis with a tool or automatic tightening device. Can be done efficiently.

Further, by providing a plurality of oblique bolt insertion holes 23 on both sides of the axial center line L1 in a state of being arranged in the thickness direction, the position of the opening of the oblique bolt insertion hole 23 that opens on the wellhead side diagonal joint surface 16 side. Can be easily designed to be concentrated near the central portion of the oblique joint surface 16 on the wellhead side in the longitudinal direction E. It is constructed by binding the adjacent hexagonal segments 12 to each other with a plurality of connecting bolts 24 passing through the vicinity of the central portion of the connecting portion in which the wellhead side diagonal joint surface 16 and the face side diagonal joint surface 15 are overlapped. The bonding state of the hexagonal segments assembled in a honeycomb shape in the lining body 11 of the shield tunnel is mechanically excellent. As a result, it becomes easy to construct the lining body 11 having high yield strength or high strength having mechanically excellent characteristics while suppressing deterioration of work efficiency of various operations.

As shown in FIGS. 1 and 3, the hexagonal segment 12 used in the present embodiment has a guide recess and a guide convex formed on the wellhead side diagonal joint surface 16 and the face side diagonal joint surface of another hexagonal segment. A guide convex portion 25a and a guide concave portion 25b for positioning that engage with the portion are formed, and the entire opening of the plurality of oblique bolt insertion holes 23a and 23b on the wellhead side diagonal joint surface 16 side is oblique to the wellhead side. It is located in the region between the guide convex portion 25a and the guide concave portion 25b in the longitudinal direction E of the joint surface 16. Such a configuration is preferable from the viewpoint of obtaining a lining body 11 having a high yield strength or a high strength having mechanically excellent properties.

From the viewpoint of ensuring that one or more of the above-mentioned effects are exhibited more reliably, two bolt insertion holes are provided on both sides of the axial center line L1 as in the hexagonal segment 12 of the above-described embodiment. When provided, as shown in FIGS. 3 (a) and 3 (b), the diagonal bolt insertion hole 23a on the inner peripheral surface 22 side is the center point Ca of the opening on the face side joint surface 13 side and the wellhead side diagonal joint surface. It is preferable that the center point Ca'of the openings of 16 is located on the inner peripheral surface 22 side of the central line Z1 in the thickness direction of the segment, and the oblique bolt insertion hole 23b on the outer peripheral surface 20 side is on the face side joint surface 13 side. It is preferable that the center point Ca of the opening and the center point Ca of the opening of the wellhead side oblique joint surface 16 are both located on the outer peripheral surface 20 side of the central line Z1 in the thickness direction of the segment.

In the method of constructing the lining body 11 using the hexagonal segment 12 of the present embodiment, the above-mentioned second step and the third step are performed in a state where the subsequent hexagonal segment is held in the holding portion of the segment transfer device. It is also preferable to separate the hexagonal segment from the holding portion after the third step. As the holding part of the segment transfer device, various known holding parts provided in the known Elector device can be used. By using a hexagonal segment in which a plurality of bolt insertion holes are arranged side by side in the thickness direction A, a space can be secured in a portion facing between the oblique bolt insertion holes on both sides. It is also possible to perform the second step and the third step while holding the step. This enables more stable and highly accurate assembly of hexagonal segments.

Further, it is also preferable to fasten the hexagonal segments to each other in the third step by an automatic fastening device conveyed by the conveying device. By using a hexagonal segment in which a plurality of bolt insertion holes are arranged side by side in the thickness direction A, a space can be secured in a portion facing between the oblique bolt insertion holes on both sides. It is also easy to arrange an automatic fastening device to be transported by the transporting device and use the automatic fastening device to fasten the hexagonal segments together. In particular, a connecting bolt is provided at a plurality of locations in the circumferential direction of the tunnel by providing an automatic fastening device at a location where the segment is moved together with the segment in the segment transport device having a mechanism for moving the segment in the circumferential direction of the tunnel such as an erector device. It is more preferable because the binding work using the above can be performed more efficiently. The automatic fastening device has at least a function of inserting the connecting bolt into the oblique bolt insertion hole or rotating the inserted connecting bolt around the axis thereof, and has a function of inserting the connecting bolt into the oblique bolt insertion hole. It may or may not have.

The present invention is not limited to the above-described embodiment, and can be appropriately modified.
For example, in FIG. 5, one of the three shield jacks 26 in the center is brought into contact with the face-side joint surface of the hexagonal segment 12, and is inserted into the bolt insertion hole of the hexagonal segment 12. Although the connecting bolts have been inserted, the number of shield jacks 26 to be brought into contact with the face-side joint surfaces of the individual hexagonal segments 12 during excavation may be two or four or more, and the individual face-side joints may be joined in the second step. The number of shield jacks 26 to be brought into contact with the surface may be two or more instead of one. For example, the number of shield jacks 26 that come into contact with the face-side joint surfaces of the individual hexagonal segments 12 during excavation is 4 to 20 (for example, 4), and the number of shield jacks 26 that come into contact with each other in the second step is 2 to 10. It can also be a book (for example, two).

11 Shield tunnel lining body 12 Hexagonal segment 13 Face side joint surface 14 Wellhead side joint surface 15 Face side diagonal joint surface 16 Wellhead side diagonal joint surface 17 V-shaped circumferential joint surface 23a, 23b, 23 Diagonal bolt insertion hole 24 Connecting bolts 15a, 15b Female screw holes 26 Shield jack

Claims (7)

The face side joint surface and the wellhead side joint surface arranged parallel to each other and the face side diagonal joint surface and the wellhead side diagonally arranged in a V shape so as to connect the ends on both sides of these joint surfaces. A hexagonal segment made of reinforced concrete that has a pair of V-shaped circumferential joint surfaces consisting of joint surfaces and is assembled in series in the axial and circumferential directions of the tunnel to form a shield tunnel lining. hand,
A plurality of oblique bolt insertion holes extending from the face side joint surface to the wellhead side diagonal joint surface are formed on both sides of the axial center line arranged along the axial direction of the tunnel.
A hexagonal segment in which the plurality of oblique bolt insertion holes are formed so as to be arranged in the thickness direction of the hexagonal segment. As the plurality of oblique bolt insertion holes, an inner oblique bolt insertion hole formed at a position close to the inner peripheral surface of the hexagonal segment and an outer oblique bolt formed at a position close to the outer peripheral surface of the hexagonal segment. It has an insertion hole and
The position of the opening on the face side joint surface side in the outer oblique bolt insertion hole is closer to the face side oblique joint surface side with respect to the position of the opening on the face side joint surface side in the inner oblique bolt insertion hole. The hexagonal segment according to claim 1, wherein the hexagonal segment is offset so that the length of the outer oblique bolt insertion hole and the length of the inner oblique bolt insertion hole are substantially the same. A guide concave portion and a guide concave portion that engage with the guide concave portion and the guide convex portion formed on the face side diagonal joint surface of the other hexagonal segment are formed on the wellhead side diagonal joint surface.
Claim 1 Or the hexagonal segment according to 2. The face side joint surface and the wellhead side joint surface arranged parallel to each other and the face side diagonal joint surface and the wellhead side diagonally arranged in a V shape so as to connect the ends on both sides of these joint surfaces. A shield tunnel cover that forms a shield tunnel lining by connecting and assembling hexagonal segments including a pair of V-shaped circumferential joint surfaces consisting of joint surfaces in the axial and circumferential directions of the tunnel. It ’s a method of constructing a structure,
As the hexagonal segment, the hexagonal segment according to any one of claims 1 to 3 is used, and the hexagonal segment is used.
The first step of moving a subsequent hexagonal segment into an isobaric recess formed by a plurality of previously arranged hexagonal segments by a segment transfer device, the face of the subsequent hexagonal segment. By pressing the side joint surface against the face side joint surface of each hexagonal segment and pressing a part of the shield jacks among a plurality of shield jacks for advancing the shield excavator by the reaction force, the said A plurality of the equipedular trapezoidal portions on the wellhead side of the subsequent hexagonal segment are provided on both sides of the axial center line in the subsequent hexagonal segment after the second step and the second step. Construction of a shield tunnel lining comprising a third step of inserting connecting bolts into each of the oblique bolt insertion holes and binding the subsequent hexagonal segment to the previously arranged hexagonal segment. Method. A claim that the second step and the third step are performed in a state where the subsequent hexagonal segment is held by the holding portion of the transport device of the segment, and the hexagonal segment is separated from the holding portion after the third step. 4. The method for constructing a shield tunnel lining body according to 4. The method for constructing a shield tunnel lining body according to claim 4 or 5, wherein 23b in the third step, the hexagonal segments are tied together by an automatic fastening device transported by the transport device. The hexagonal segment according to claim 2 is used as the hexagonal segment, and a common connecting bolt having the same length is used as a connecting bolt to be inserted into the outer oblique bolt insertion hole and the inner oblique bolt insertion hole. The method for constructing a shield tunnel lining body according to any one of claims 4 to 6, using the above method.

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