JP7365269B2 - Construction method of hexagonal segment and shield tunnel lining - Google Patents

Description

The present invention relates to hexagonal segments and a joint structure of hexagonal segments, and in particular, hexagonal segments used to form a shield tunnel lining by assembling them in series in the axial and circumferential directions of a tunnel. and a method for constructing a shield tunnel lining using hexagonal segments.

The shield method using a shield excavator is widely used as a method for constructing various tunnels in urban areas and plain areas. In the shield construction method, the face at the tip of the shield excavator is pressed down by mud, muddy water, pressurized air, etc., and the ground is excavated using a cutter, and the tunnel is connected in the axial and circumferential directions behind the shield excavator. By sequentially assembling the segments, a lining is formed that covers the inner peripheral surface of the tunnel, and a shield jack is pressed against the front end of the assembled lining to obtain a reaction force while reaching from the starting shaft. This is a construction method in which a tunnel is constructed underground towards a shaft.

In recent years, from the perspective of improving construction efficiency, segments forming the lining that covers the inner peripheral surface of tunnels have been provided with hexagonal planar shapes instead of the generally used rectangular planar segments. A shield construction method using hexagonal segments may be adopted (for example, see Patent Document 1 and Patent Document 2). The hexagonal segment has a face-side joint surface and a well-head-side joint surface that are arranged in parallel, and a face-side diagonal joint surface that is arranged in a V-shape so as to connect the ends on both sides of these joint surfaces. and a pair of V-shaped circumferential joint surfaces consisting of diagonal joint surfaces on the wellhead side (see FIG. 1(a)). The hexagonal segment is attached to the face-side joint surface and the diagonal face-side joint surface of the hexagonal segment that is assembled in advance on the rear side in the tunnel excavation direction, and on the face-side joint surface and the face-side diagonal joint surface of the hexagonal segment that is subsequently assembled on the forward side in the tunnel excavation direction. The tunnel is constructed by overlapping the joint surface on the tunnel entrance side and the diagonal joint surface on the shaft entrance side, while alternately protruding the isosceles trapezoidal portions of each hexagonal segment, which are the forward half portions in the tunnel excavation direction. They are arranged in a honeycomb shape in the axial and circumferential directions and are sequentially assembled (see, for example, FIGS. 4 to 6 of Patent Document 3).

In addition, in the shield construction method using hexagonal segments, a shield jack is pressed against the face side joint surface of the isosceles trapezoidal portions of the hexagonal segments that protrude alternately, and while the shield excavator is excavating while taking the reaction force. In parallel with this, the subsequent hexagonal segments can be assembled in the area between the adjacent isosceles trapezoidal sections against which the shield jack is pressed, so that the segments with rectangular planar shapes can be assembled. Unlike the previously used shield construction method, the shield excavation machine can be continuously excavated while assembling hexagonal segments, instead of interrupting the excavation process of the shield excavation machine for each ring and assembling the segments. , it is possible to carry out shielding work efficiently.

Furthermore, in the shield construction method using hexagonal segments, the connection between adjacent hexagonal segments is the joint surface on the face side, the joint surface on the wellhead side, the diagonal joint surface on the face side, or the end face by the diagonal joint surface on the wellhead side. Since this is done using a connecting bolt that is attached through the space (for example, see Patent Document 1, Patent Document 2, and Patent Document 3), the inner circumferential surface of the lining body made of rectangular segments is It is possible to prevent the appearance of irregularities caused by a bolt box or the like for fastening the connecting bolts from being formed on the inner circumferential surface of the lining body made of hexagonal segments. This also allows the inner circumferential surface of the lining to be maintained in a smooth state, so it is preferable to further apply a secondary lining inside the lining made of hexagonal segments with an anti-corrosion layer on the inner surface. There is no need for construction, and the inner circumferential surface of the lining made of hexagonal segments can be used as the inner circumferential surface of the tunnel, and the constructed shield tunnel can be used, for example, as a sewer pipe for water circulation, or as a temporary rainwater drain. It will also be possible to effectively utilize it as a tunnel for a storage area where water can be stored.

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

By the way, in shield tunnels constructed deep underground or with large diameter shield tunnels, the thickness and weight of the hexagonal segments used increase, and greater shearing force is applied to the joints between the hexagonal segments. A strong connection means that can withstand resistance is required.
As such a connecting means, it is possible to use a connecting bolt with a large cross-sectional area, but due to the increased weight of the connecting bolt, it becomes difficult to manually transport or insert the connecting bolt into the bolt insertion hole. The work efficiency of the connection work decreases, such as making it difficult to do the work.

In addition, as a bolt insertion hole through which a connecting bolt is inserted, a diagonal bolt insertion hole is provided in the hexagonal segment, extending from the face-side joint surface to the tunnel entrance-side diagonal joint surface, and through which the connecting bolt is inserted approximately parallel to the face-side diagonal joint surface. It is known to form an axial bolt insertion hole through which a connecting bolt is inserted substantially parallel to the axial direction of the tunnel, communicating the face-side joint surface and the tunnel entrance-side joint surface (Patent Document 2). (see Figure 1).
However, when connecting hexagonal segments of the same configuration in the axial direction of the tunnel, the positions of the axial bolt insertion holes overlap, so hexagonal segments with axial bolt insertion holes can be installed. Limited range. Therefore, it is possible to use long bolts that pass through multiple hexagonal segments, but it is difficult to insert long bolts through multiple hexagonal segments, and it is difficult to insert long bolts through multiple hexagonal segments. The bolts also have increased weight and length. Therefore, the efficiency of the work of connecting segments is reduced.

Furthermore, a segment made of steel or ductile cast iron is known in which a plurality of bolt insertion holes are provided in a joint plate disposed at a joint between segments 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 shape in plan view is not hexagonal. There is nothing written about it.

In addition, the present inventors have provided bolt insertion holes extending from the face-side joint surface to the tunnel entrance-side diagonal joint surface on each side of the axial center line along the axial direction of the tunnel in the hexagonal segment at predetermined positions in the circumferential direction of the tunnel. It was also considered to form a plurality of bolts arranged at intervals of , but it turned out that in that case, the workability when inserting the connecting bolts would be greatly reduced.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a hexagonal segment and a shield using the hexagonal segment, which can easily achieve high joint strength between connected hexagonal segments and also have excellent workability in various operations associated with the connection. The object of the present invention is to provide a method for constructing a tunnel lining.

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

In the hexagonal segment of the present invention, the plurality of diagonal bolt insertion holes include an outer diagonal bolt insertion hole formed near the outer circumferential surface of the hexagonal segment, and an outer diagonal bolt insertion hole formed near the inner circumferential surface of the hexagonal segment. and an inner diagonal bolt insertion hole formed at a position such that the opening on the face side joint surface side in the outer diagonal bolt insertion hole is located at the face side joint in the inner diagonal bolt insertion hole. With respect to the position of the opening on the surface side, it is shifted toward the face side diagonal joint surface side, and the length of the outer diagonal bolt insertion hole and the length of the inner diagonal bolt insertion hole are approximately the same. Preferably. Further, in the hexagonal segment of the present invention, the diagonal joint surface on the tunnel entrance side is provided with a guide convex portion or a guide concave portion that engages with a guide concave portion or a guide convex portion formed on the face side diagonal joint surface of another hexagonal segment. The openings of the plurality of diagonal bolt insertion holes on the side of the diagonal joint surface on the wellhead side are located in a region between the guide recess and the guide protrusion in the longitudinal direction of the diagonal joint surface on the wellhead side. It is preferable to do so.

Further, the present invention provides a face-side joint surface and a wellhead-side joint surface that are arranged parallel to each other, and a face-side diagonal joint that is arranged in a V-shape so as to connect the ends on both sides of these joint surfaces. A shield tunnel lining is formed by assembling hexagonal segments each having a pair of V-shaped circumferential joint surfaces consisting of a surface and a diagonal joint surface on the tunnel entrance side in the axial and circumferential directions of the tunnel. , a method for constructing a lining for 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 are arranged in advance. a first step of moving a subsequent hexagonal segment into an isosceles trapezoid-shaped recess formed by the segment by a segment conveying device having a segment holding portion; , by pressing some of the shield jacks of the plurality of shield jacks against the face-side joint surfaces of the individual hexagonal segments and using the reaction force thereof to advance the shield excavator, the subsequent hexagonal a second step of bringing the isosceles trapezoidal portion of the segment on the mine entrance side into close contact with the recess; and after the second step, a plurality of diagonal bolt insertion holes provided on both sides of the axial center line in the subsequent hexagonal segment; Provided is a method for constructing a lining for a shield tunnel, comprising a third step of inserting connecting bolts into each of the hexagonal segments to tightly connect the subsequent hexagonal segments to the previously arranged hexagonal segments. It is something.

Further, the method for constructing a shield tunnel lining according to the present invention is carried out with the subsequent hexagonal segment being held in the holding part of the segment conveying device, and after the third step, the hexagonal segment is held in the holding part of the segment conveying device. It is preferable to include a fourth step of separating from the portion. Further, in the method for constructing a shield tunnel lining according to the present invention, it is preferable that the hexagonal segments are fastened together in the third step by an automatic fastening device that is transported together with the hexagonal segments by the transport device. . Further, in the method for constructing a shield tunnel lining of the present invention, the hexagonal segment is such that the position of the opening on the face-side joint surface side of the outer diagonal bolt insertion hole is the same as that of the hexagonal segment in the inner diagonal bolt insertion hole. The opening is shifted toward the face side diagonal joint surface with respect to the position of the opening on the face side joint surface side, and the length of the outer diagonal bolt insertion hole and the length of the inner diagonal bolt insertion hole are approximately the same. It is preferable to use a common connecting bolt having the same length as the connecting bolt inserted into the outer diagonal bolt insertion hole and the inner diagonal bolt insertion hole.

According to the hexagonal segment and shield tunnel lining construction method 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 forming a thick lining or a large diameter lining for a shield tunnel, efficient connection work can be performed.

FIG. 3 is a diagram showing an example of a hexagonal segment according to the present invention, in which (a) is a plan view, (b) is a side view of (a) seen from the E direction, and (c) is a side view of (a) seen from the F direction. (d) is a side view of (a) viewed from the G direction. FIG. 2 is a partially cutaway perspective view showing an example of a shield tunnel lining formed using the hexagonal segment and shield tunnel lining manufacturing method of the present invention. 1(a) is an enlarged view of a portion of the lower half of the face-side joint surface shown in FIG. 1(b) viewed from the normal direction; FIG. , is an enlarged view of the diagonal joint surface on the mine entrance side shown in FIG. 1(d), viewed from the normal direction. FIG. 2 is an explanatory diagram of the diagonal bolt insertion hole of the hexagonal segment shown in FIG. 1, in which (a) is a cross-sectional view before the connecting bolt is inserted, and (b) is a cross-sectional view with the connecting bolt inserted. be. (a) to (c) are explanatory views of the process of assembling a plurality of hexagonal segments to form a lining body.

Hereinafter, the present invention will be explained based on its preferred embodiments.
As shown in FIGS. 1(a) to 1(d), the hexagonal segment 12 according to a preferred embodiment of the present invention has a face side joint surface 13 and a wellhead side joint surface 14 arranged parallel to each other, and A pair of V-shaped circumferential joint surfaces 17 consisting of a face-side diagonal joint surface 15 and a mine mouth-side diagonal joint surface 16, which are 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 and having a hexagonal shape in plan view. The hexagonal segments made of reinforced concrete are not limited to those made entirely of reinforced concrete, and may be reinforced at appropriate locations with reinforcing plates made of steel plates or the like. The hexagonal segment 12 has a hexagonal outer circumferential surface 20 disposed on the radially outer side of the tunnel and a hexagonal inner circumferential surface 22 disposed on the radially inner side of the tunnel. It is a plate-shaped body having a substantially constant thickness, and the cross section along the face-side joint surface 13 and the tunnel entrance-side joint surface 14 has an arcuate shape with a radius of curvature corresponding to the radius of the tunnel. (See FIGS. 1(b) and (c)). The hexagonal segments 12 can be used to construct the lining 11 of a shield tunnel of any thickness or diameter, but are particularly suitable for constructing the lining 11 of a tunnel with a large diameter. The radius of curvature of the outer circumferential surface 20 in the cross section in the direction along the well mouth 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 deep underground, and the thickness T (distance between the outer circumferential surface and the inner circumferential surface) of the hexagonal segment 12 is, for example, 20 to 90 cm. , preferably 30 to 60 cm.

By assembling a plurality of hexagonal segments 12 consecutively in the axial direction (excavation direction) A lining body 11 (see FIG. 2) can be formed to cover the inner peripheral surface of a shield tunnel such as a shield tunnel. The angle θ between the face-side diagonal joint surface 15 and the wellhead-side diagonal joint surface 16 in each V-shaped circumferential joint surface 17 in the hexagonal segment 12 is 120° (FIG. 1(a) reference). Thereby, the plurality of hexagonal segments 12 are attached to the face-side diagonal joint surfaces 15 and 13 of the preceding hexagonal segments 12, and to the tunnel-side diagonal joint surfaces 16 and 13 of the hexagonal segments 12 to be installed subsequently. The well mouth side joint surfaces 14 can be arranged in a honeycomb shape in the axial direction and the circumferential direction in a state where they are successively overlapped without any gaps (see FIG. 5).

As shown in FIG. 1, the hexagonal segment 12 according to the present embodiment has a diagonal joint from the face side joint surface 13 to the tunnel entrance side diagonal joint on both sides of the axial center line L1 arranged along the axial direction of the tunnel. A plurality of diagonal bolt insertion holes 23 are formed across the surface 16. Further, the plurality of diagonal bolt insertion holes 23 provided on both sides of the axial center line L1 are arranged in a line in the thickness direction Z of the hexagonal segment 12, as shown in FIG. The axial center line L1 is an imaginary line that bisects the distance between the tips of the pair of V-shaped circumferential joint surfaces in the hexagonal segment 12, and is This is an imaginary 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 a plan view of the hexagonal segment (see FIG. 1(a)).

Regarding the plurality of diagonal bolt insertion holes 23 formed on each side of the axial center line L1 of the hexagonal segment 12, the plurality of diagonal bolts formed below the axial center line L1 in FIG. This will be explained using the insertion hole 23 as an example. Hereinafter, a plurality of diagonal bolt insertion holes formed on one side with respect to the axial center line L1 and a plurality of diagonal bolt insertion holes formed on the other side with respect to the axial center line L1 are collectively referred to. Also called "multiple diagonal bolt insertion holes." The hexagonal segment 12 shown in FIG. 1 has a shape that is symmetrical with respect to the axial center line L1.

As shown in FIGS. 1 and 3(a), the hexagonal segment 12 according to this 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 a diagonal bolt insertion hole 23. More specifically, in the thickness direction Z, an inner diagonal bolt insertion hole 23a formed at a position close to the inner peripheral surface 22 and an outer diagonal bolt insertion hole 23a formed at a position closer to the outer peripheral surface 20 than the diagonal bolt insertion hole 23a. It has a diagonal bolt insertion hole 23b . The state in which the plurality of diagonal bolt insertion holes 23 are lined up 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 diagonal bolt insertion holes 23 are lined up in the thickness direction Z of the hexagonal segment 12. In addition, it is preferable that the openings of the plurality of diagonal bolt insertion holes 23 on the side of the diagonal joint surface 16 on the mine entrance side are lined up in the thickness direction of the hexagonal segment. Here, the expression "aligned" includes cases where there is some deviation in the range in which the effects of the present invention can be achieved.

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

Even if the diagonal bolt insertion hole 23 has the 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 diagonal bolt insertion hole 23 are , as shown in FIG. 4(a), is the intersection between the axial center line g of the main body portion 23m and the opening surface of the fastening recess 23c opening in the face-side joint surface 13. However, since the deviation between the intersection point and the center point of the opening surface of the fastening recess 23c is often slight, unless it is obvious that the deviation is large, The center point may be the center point Ca or Cb of the opening of the diagonal bolt insertion hole 23.

The diagonal bolt insertion hole 23 in this embodiment also has a recessed portion 23d whose cross-sectional area is larger than that of the main body portion 23m at the end portion on the side of the diagonal joint surface 16 on the mine entrance side. Even when the diagonal bolt insertion hole 23 has a recess 23d at the end on the side of the diagonal joint surface 16 on the mine entrance side, the inner peripheral surface of which is shaped so as not to follow the outer peripheral surface of the connecting bolt through which the diagonal bolt insertion hole 23 is inserted. As shown in FIG. 4(b), the center points Ca' and Cb' of the openings are the intersections of the axial center line g of the main body 23m and the opening surface of the recess 23d opening at the diagonal joint surface 16 on the tunnel entrance side. It is. However, since the deviation between the intersection point and the center point of the opening surface of the recess 23d is usually slight, unless it is clear that the deviation is large, the center point of the opening surface of the recess 23d is , the center points Ca' and Cb' of the opening of the diagonal bolt insertion hole 23 may be used.

The hexagonal segment 12 is formed as a plurality of diagonal bolt insertion holes formed on each side of the axial center line L1 at a position close to the inner circumferential surface 22 of the hexagonal segment, as shown in FIG. 3(a). It has an inner diagonal bolt insertion hole 23a and an outer diagonal bolt insertion hole 23b formed at a position close to the outer peripheral surface 20 of the hexagonal segment. 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 inside diagonal bolt insertion hole 23a, and the length of the outside diagonal bolt insertion hole 23b is different from the opening position on the face side joint surface 13 side. The lengths of the inner diagonal bolt insertion holes 23a are approximately the same.

Thereby, connecting bolts having a common length can be suitably used as the connecting bolts that are inserted into the diagonal bolt insertion holes 23a and used to fasten the segments together. Moreover, it becomes easy to use a common sheath pipe 23s and the like used to form the plurality of diagonal bolt insertion holes 23a and 23b. Although it is not essential in the present invention to use connecting bolts with a common length, it is possible to use connecting bolts with a common length by using different connecting bolts for each diagonal bolt insertion hole. Compared to the case, various burdens such as insertion work, carrying-in work, and material management can be reduced.

As a method of making the length of the outer diagonal bolt insertion hole 23b and the length of the inner diagonal bolt insertion hole 23a substantially the same, the positions of the openings of the plurality of connecting bolts on the diagonal joint surface 16 side on the mine entrance side are shifted. However, it is preferable to at least shift the position of the opening on the face-side joint surface 13 side and not shift the position of the opening on the tunnel-side diagonal joint surface 16 side, or to suppress the degree of shifting. The point of view is to concentrate the passing points near the longitudinal center of the diagonal joint surface 16 on the tunnel entrance side, and to provide excellent strength to the lining body formed by assembling the hexagonal segments 12 in the circumferential and axial directions of the tunnel. preferred. L2 shown in FIG. 3(a) is the length of the shift of the diagonal bolt insertion hole 23b required for this purpose. The length of the connecting bolt 24 is the distance between the center points Ca, Cb of the opening on the face-side joint surface 13 side and the center points Ca', Cb' of the opening on the side of the diagonal joint surface 16 on the tunnel entrance side. be.

A plurality of female screw holes 15a, 15b corresponding to the plurality of diagonal bolt insertion holes 23 are provided in the center of the pair of face-side diagonal joint surfaces 15 of the hexagonal segment 12. The female screw holes 15a and 15b are provided by, for example, embedding a female screw anchor. The female screw holes 15a, 15b are formed when the face side diagonal joint surface 15 of the hexagonal segment 12 installed previously is superimposed on the tunnel entrance side diagonal joint surface 16 of the hexagonal segment 12 installed subsequently. , and communicates linearly with the end of the diagonal bolt insertion hole 23 provided in the subsequent hexagonal segment 12, opposite to the fastening recess 23a. As a result, each adjacent hexagonal segment 12 arranged in a honeycomb shape is firmly secured by inserting and tightening the connecting bolt 24 into the communicating diagonal bolt insertion hole 23 and female screw holes 15a and 15b. (See Figure 2).

In addition, in the hexagonal segment 12 of this embodiment, similar to the hexagonal segment (hexagonal segment) described in, for example, Japanese Patent No. 3253870, the face-side diagonal joint surface 15 and the tunnel mouth-side diagonal joint surface 16 are provided for positioning. A guide protrusion 25a and a guide recess 25b are provided, respectively. These positioning guide protrusions 25a and guide recesses 25b are used when installing the next hexagonal segment 12 following the previously installed hexagonal segment 12. Following the isosceles trapezoidal interval portion (recess) between the isosceles trapezoidal portions adjacent to the circumferential direction Y and protruding forward in the excavation direction X by the segments 12 (see FIG. 5(a)) It has a function of guiding the hexagonal segments 12 so that they can be positioned with high precision, and also preventing the assembled hexagonal segments 12 from being misaligned.

Further, the hexagonal segments 12 of this embodiment are provided with a gripping hole 29, for example, in the center of the inner surface, so that the hexagonal segments 12 can be gripped by an assembly erector device (not shown). A pair of lifting insert fittings 27 are provided, which are arranged, for example, in the side regions on both sides of the joint surface 14 on the wellhead side, and which allow the hexagonal segments 12 to be lifted.

Furthermore, the hexagonal segment 12 of this embodiment includes an inner circumferential groove 21a and an outer circumferential groove 21b, which are provided at two locations spaced apart in the thickness direction over the entire circumference of the hexagonal segment 12 in plan view. . In this specification, the plane of a hexagonal segment is a surface on the inner peripheral surface side of the hexagonal segment (see FIG. 1(a)). In the thickness direction Z of the hexagonal segment 12, the inner circumferential groove 21a is formed at a position closer to the inner circumferential surface 22 than the outer circumferential groove 21b. More specifically, in the hexagonal segment 1, the face side joint surface 13, the well mouth side joint surface 14, the face side diagonal joint surface 15, and the well mouth side diagonal joint surface 16 are as shown in FIGS. 1(a) to (d). As shown, outer circumferential grooves 21b having a width of about 20 mm are formed continuously around the entire circumference of the hexagonal segment 12 at intervals of about 60 mm from the outer circumferential surface of the hexagonal segment 12. An inner circumferential groove 21 a having a width of about 20 mm is formed continuously over the entire circumference of the hexagonal segment 12 at an interval of about 60 mm from the inner circumferential surface of the hexagonal segment 12 . The inner circumferential groove 21a and the outer circumferential groove 21b are formed parallel to each other and have a substantially constant distance from each other over the entire circumference of the hexagonal segment 12. Inside the inner circumferential groove 21a and the outer circumferential groove 21b, a sealing material 18, preferably made of a band-shaped water-swellable sealing material, is continuous over the entire circumference of the hexagonal segment 12 via an adhesive. It is set up like this.
The hexagonal segments 12 having the above-mentioned configuration have a plurality of them in the axial direction (excavation direction) By assembling them in series, it is possible to form a shield tunnel lining 11 (see FIG. 2) with excellent water-stopping performance that blocks the flow of water moving from the inside to the outside and from the outside to the inside.

The hexagonal segments 12 according to the present embodiment can form the lining body 11 of the shield tunnel by connecting a plurality of hexagonal segments 12 in the axial direction X and circumferential direction Y of the tunnel and assembling them in a honeycomb shape. . In order to assemble a plurality of hexagonal segments 12 consecutively in the axial direction (excavation direction) The hexagonal segment 12 that is subsequently assembled on the front side in the tunnel excavation direction The isosceles trapezoidal portion, which is the front half of each hexagonal segment 12 in the tunnel excavation direction While protruding, a plurality of hexagonal segments 12 are arranged in a honeycomb shape in the axial direction X and circumferential direction Y of the tunnel and are sequentially assembled.

Further, when a plurality of hexagonal segments 12 are sequentially assembled in the axial direction The shield jack 26 is pressed against the face-side joint surface 13 of the tip of the shield excavator, and while the shield excavator excavates while taking the reaction force, in parallel, the shield jack 26 is pressed against the adjacent isosceles trapezoid shape. In the area between the parts, it is possible to carry out the assembly of the following hexagonal segments 12.

As an embodiment of the shield tunnel lining construction method of the present invention, a method for constructing the lining 11 using the hexagonal segments 12 having the above-described configuration will be described. 5(a), in the area between adjacent isosceles trapezoidal parts in the circumferential direction Y where the shield jack 26 is pressed against the face side joint surface 13, the shield jack 26 in the area between the areas is contracted. As a state, a hexagonal segment 12 to be installed subsequently is transported to the area between the segments by a segment transport device (erector device, etc.), and then a hexagonal segment 12 to be installed subsequently is transported to the area between the segments by the transport device for the segment. The subsequent hexagonal segment 12 is moved into the isosceles trapezoid-shaped recess 28 formed by the plurality of arranged hexagonal segments (first step). In the first step, the isosceles trapezoid-shaped portion of the rear half of the hexagonal segment 12 to be assembled subsequently is inserted into the isosceles trapezoid-shaped recess 28, and the well opening existing in the isosceles trapezoid-shaped portion is inserted into the isosceles trapezoid-shaped recess 28. 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 previously assembled hexagonal segment 12 (Fig. 5(a) )reference).

After that, for example, among the three shield jacks 26 arranged in the area between the adjacent isosceles trapezoidal parts, the central one shield jack 26 is extended, and the shield jack 26 is extended to the following six shield jacks 26. By pressing against the face side joint surface of the square segment 12, the isosceles 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 isosceles trapezoidal portion of the rear half of the hexagonal segment 12 to be assembled subsequently are It is pressed against the face side joint surface 13 and the face side diagonal joint surface 15 of the square segment 12 and comes into close contact with each other. More specifically, the hexagonal segment 12 to be assembled subsequently is preferably held on both sides of the face-side joint surface 13 of the hexagonal segment 12 while maintaining the holding of the segment by the conveying device via the gripping hole 29. By pressing the one shield jack 26 against the region located between the diagonal bolt insertion holes, the subsequent hexagonal segment 12 is pressed against the previously assembled hexagonal segment 12. , 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 multiple bolts are inserted on each side. The connecting bolts 24 are used to tightly connect the hexagonal segments 12 arranged previously (third step). In the third step, the connecting bolt 24 is inserted into the diagonal bolt insertion hole 23 of the succeeding hexagonal segment 12 and the female threaded hole 15a of the previously installed hexagonal segment 12 and tightened. By attaching the hexagonal segments 12 to each other, adjacent hexagonal segments 12 are connected and integrated. Through this third step, the subsequent hexagonal segment 12 is firmly attached to the previously installed hexagonal segment 12 via the connecting bolts 24, which are inserted through two or more bolts on one side and four or more in total. be tied together. At this time, in order to prevent the end of the hexagonal segment 12 on the face side from lowering due to its own weight, the connecting bolt 24 installed above the hexagonal segment 12 may be strongly tightened within an allowable range.

Such work is performed in each region between adjacent protruding isosceles trapezoidal portions formed in the circumferential direction, and the hexagonal segment 12 newly installed in this way is As the existing hexagonal segments 12 assembled with By repeating the work of assembling subsequent hexagonal segments in the area between these pressed hexagonal segments 12, a plurality of hexagonal segments arranged in a honeycomb shape in the axial direction X and circumferential direction Y of the tunnel are formed. It becomes possible to easily form the lining body 11 using the rectangular segments 12 to cover the inner circumferential surface of a shield tunnel, preferably for a storage area where rainwater is temporarily stored.

According to the hexagonal segment 12 according to the present embodiment and the method for constructing the shield tunnel lining 11 described above using the hexagonal segment 12, diagonal bolts are provided on both sides of the axial center line L1 and arranged in the thickness direction. Since the hexagonal segments can be tightly connected by inserting a total of four or more connecting bolts 24 through the insertion holes 23, high bonding strength can be achieved between the hexagonal segments assembled adjacent to each other in a honeycomb shape. is obtained. Furthermore, compared to using large cross-section connecting bolts to increase joint strength or using axial connecting bolts that pass through multiple hexagonal segments, it is possible to reduce the weight of individual connecting bolts. Therefore, it is possible to easily construct a high-yield shield tunnel lining in which hexagonal segments are connected with high joint strength without reducing the handling of connection bolts or work efficiency.
Therefore, for example, it becomes easy to construct a shield tunnel in a deep underground or a large diameter shield tunnel using thick hexagonal segments or heavy hexagonal segments.

In addition, compared to the case where a plurality of diagonal bolt insertion holes are formed on each side of the axial center line L1 of the hexagonal segment in a curved direction along the circumferential direction of the tunnel (direction of arrow Y1 in FIG. 3(a)). 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 26 that are brought into contact with individual hexagonal segments in order to move the shield tunneling machine forward may be brought into contact 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 condition that the connecting bolts 24 are in contact with each other.

The third step of the shield tunnel lining construction method of the present invention may be performed after separating some of the shield jacks 26 from the subsequent hexagonal segments 12, but even in that case, the hexagonal By arranging a plurality of bolt insertion holes in the thickness direction of the segment, a large space can be secured between the diagonal bolt insertion holes on both sides in the opposing parts. Various tasks such as transporting bolts to the proper position for insertion into bolt holes, inserting connecting bolts into diagonal bolt holes, and rotating connecting bolts around their axis using tools, automatic tightening devices, etc. can be done efficiently.

In addition, by providing a plurality of diagonal bolt insertion holes 23 arranged in the thickness direction on each side of the axial center line L1, the position of the opening of the diagonal bolt insertion holes 23 that open toward the diagonal joint surface 16 on the tunnel entrance side is It is also easy to design a structure in which the components are concentrated near the center in the longitudinal direction E of the diagonal joint surface 16 on the tunnel entrance side. It is constructed by tightly connecting adjacent hexagonal segments 12 with a plurality of connecting bolts 24 passed through the vicinity of the center of a connecting portion where the diagonal joint surface 16 on the tunnel entrance side and the diagonal joint surface 15 on the face side are overlapped. The hexagonal segments assembled in a honeycomb shape in the shield tunnel lining 11 are mechanically bonded to each other in an excellent manner. This makes it easy to construct a high-yield or high-strength lining body 11 that has excellent mechanical properties while suppressing deterioration of work efficiency in various operations.

As shown in FIGS. 1 and 3, the hexagonal segment 12 used in this embodiment has guide recesses and guide protrusions formed on the diagonal joint surface 16 on the tunnel entrance side and on the diagonal joint surface on the face side of the other hexagonal segments. A guide convex portion 25a and a guide recess 25b are formed for positioning to engage with the hole, and the entire opening of the plurality of diagonal bolt insertion holes 23a, 23b on the side of the diagonal joint surface 16 on the mine mouth side It is located in the region between the guide protrusion 25a and the guide recess 25b in the longitudinal direction E of the joint surface 16. Such a configuration is preferable from the viewpoint of obtaining a high yield strength or high strength lining body 11 having excellent mechanical properties.

From the viewpoint of more reliably achieving one or more of the above-mentioned effects, two bolt insertion holes are provided on each side 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 circumferential surface 22 side is located between the center point Ca of the opening on the face side joint surface 13 side and the diagonal joint surface on the tunnel entrance side. It is preferable that the center points Ca' of the 16 openings are located closer to the inner circumferential surface 22 than the center line Z1 in the thickness direction of the segment, and the diagonal bolt insertion holes 23b on the outer circumferential surface 20 side are located on the face side joint surface 13 side. It is preferable that the center point Ca of the opening of the shaft and the center point Ca' of the opening of the wellhead side diagonal joint surface 16 are both located closer to the outer circumferential surface 20 than the center line Z1 in the thickness direction of the segment.

In the method of constructing the lining body 11 using the hexagonal segments 12 of the present embodiment, the second and third steps described above are performed while the subsequent hexagonal segment is held in the holding section of the segment conveying device. It is also preferred that the hexagonal segment is separated from the holding part after the third step. As the holding part of the segment conveyance device, various known holding parts included in known erector devices 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 between the diagonal bolt insertion holes on both sides at the opposing parts, so that the segment can be easily moved by the holding part of the segment conveyance device. It is also possible to perform the second step and the third step while maintaining the temperature. This allows for more stable and accurate assembly of hexagonal segments.

It is also preferable that the hexagonal segments be fastened together in the third step by an automatic fastening device conveyed by a 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 between the diagonal bolt insertion holes on both sides at the opposing parts, so that the space or the space containing the space, It is also easy to arrange an automatic fastening device conveyed by a conveying device and use the automatic fastening device to fasten the hexagonal segments together. In particular, in a segment conveying device such as an erector device that is equipped with a mechanism for moving segments in the tunnel circumferential direction, an automatic fastening device is provided at a location that moves together with the segment. This is more preferable because the tightening work can be carried out more efficiently using the method. Note that the automatic fastening device has at least the function of inserting the connecting bolt into the diagonal bolt insertion hole or rotating the inserted connecting bolt around its axis, and the function of inserting the connecting bolt into the diagonal bolt insertion hole. It may or may not have.

The present invention is not limited to the embodiments described above, and can be modified as appropriate.
For example, in FIG. 5, one shield jack 26 at the center of the three shield jacks 26 is brought into contact with the face side joint surface of the hexagonal segment 12, and the bolt insertion hole of the hexagonal segment 12 is Although the connecting bolts 26 are inserted into the joint faces of the individual hexagonal segments 12 during excavation, two or four or more shield jacks 26 may be brought into contact with the joint faces on the face sides of the individual hexagonal segments 12 in the second step. The number of shield jacks 26 brought into contact with the joint surface may also be two or more instead of one. For example, the number of shield jacks 26 that are brought into contact with the face side joint surface of each hexagonal segment 12 during excavation is set to 4 to 20 (for example, 4), and the number of shield jacks 26 that are brought into contact in the second step is set to 2 to 10. It can also be a book (for example, two books).

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

Claims (7)

A face side joint surface and a wellhead side joint surface are arranged parallel to each other, and a face side diagonal joint surface and a wellhead side diagonal joint surface are arranged in a V-shape so as to connect the ends on both sides of these joint surfaces, respectively. A hexagonal segment made of reinforced concrete, which is provided with a pair of V-shaped circumferential joint surfaces, and which is assembled in series in the axial and circumferential directions of the tunnel to form the lining of the shield tunnel. hand,
A plurality of linear diagonal bolt insertion holes extending from the face-side joint surface to the tunnel entrance-side diagonal joint surface are formed on each side of an axial center line arranged along the axial direction of the tunnel,
The plurality of diagonal bolt insertion holes are formed in a state lined up in the thickness direction of the hexagonal segment,
A hexagonal segment that does not have an insertion hole extending from the face-side joint surface to the wellhead-side joint surface . A face side joint surface and a wellhead side joint surface are arranged parallel to each other, and a face side diagonal joint surface and a wellhead side diagonal joint surface are arranged in a V-shape so as to connect the ends on both sides of these joint surfaces, respectively. A hexagonal segment made of reinforced concrete, which is provided with a pair of V-shaped circumferential joint surfaces, and which is assembled in series in the axial and circumferential directions of the tunnel to form the lining of the shield tunnel. hand,
A plurality of diagonal bolt insertion holes extending from the face-side joint surface to the tunnel entrance-side diagonal joint surface are formed on each of both sides of an axial center line arranged along the axial direction of the tunnel,
The plurality of diagonal bolt insertion holes are formed in a state lined up in the thickness direction of the hexagonal segment,
The plurality of diagonal bolt insertion holes include an inner diagonal bolt insertion hole formed at a position close to the inner circumferential surface of the hexagonal segment, and an outer diagonal bolt insertion hole formed at a position close to the outer circumferential surface of the hexagonal segment. It has an insertion hole,
The position of the opening on the face side joint surface side in the outer diagonal bolt insertion hole is on the face side diagonal joint surface side with respect to the position of the opening on the face side joint surface side in the inside diagonal bolt insertion hole. The hexagonal segments are offset, and the length of the outer diagonal bolt insertion hole and the length of the inner diagonal bolt insertion hole are substantially the same. A guide convex portion and a guide concave portion are formed on the tunnel entrance side diagonal joint surface to engage with a guide concave portion and a guide convex portion formed on the face side diagonal joint surface of another hexagonal segment,
1 . The openings of the plurality of diagonal bolt insertion holes on the side of the diagonal joint surface on the mine entrance side are located in a region between the guide protrusion and the guide recess in the longitudinal direction of the diagonal joint surface on the mine mouth side. or the hexagonal segment described in 2. A face side joint surface and a wellhead side joint surface are arranged parallel to each other, and a face side diagonal joint surface and a wellhead side diagonal joint surface are arranged in a V-shape so as to connect the ends on both sides of these joint surfaces, respectively. A shield tunnel lining that forms a shield tunnel lining by assembling hexagonal segments having a pair of V-shaped circumferential joint surfaces in series in the axial and circumferential directions of the tunnel. A method of constructing a construction body,
Using the hexagonal segment according to any one of claims 1 to 3 as the hexagonal segment,
a first step of moving a subsequent hexagonal segment by a segment conveying device into an isosceles trapezoid-shaped recess formed by a plurality of hexagonal segments arranged in advance, the face of the subsequent hexagonal segment; By pressing some of the shield jacks of the plurality of shield jacks against the face-side joint surfaces of the individual hexagonal segments to advance the shield excavator by the reaction force thereof, A second step of bringing the isosceles trapezoidal portion of the subsequent hexagonal segment on the well mouth side into close contact with the recess, and after the second step, a plurality of the Construction of a shield tunnel lining, comprising a third step of inserting connecting bolts into each of the diagonal bolt insertion holes to tightly connect the subsequent hexagonal segment to the previously arranged hexagonal segment. Method. A face side joint surface and a wellhead side joint surface are arranged parallel to each other, and a face side diagonal joint surface and a wellhead side diagonal joint surface are arranged in a V-shape so as to connect the ends on both sides of these joint surfaces, respectively. A shield tunnel lining that forms a shield tunnel lining by assembling hexagonal segments having a pair of V-shaped circumferential joint surfaces in series in the axial and circumferential directions of the tunnel. A method of constructing a construction body,
Using the hexagonal segment according to claim 2 as the hexagonal segment,
a first step of moving a subsequent hexagonal segment by a segment conveying device into an isosceles trapezoid-shaped recess formed by a plurality of hexagonal segments arranged in advance, the face of the subsequent hexagonal segment; By pressing some of the shield jacks of the plurality of shield jacks against the face-side joint surfaces of the individual hexagonal segments to advance the shield excavator by the reaction force thereof, A second step of bringing the isosceles trapezoidal portion of the subsequent hexagonal segment on the well mouth side into close contact with the recess, and after the second step, a plurality of the a third step of inserting a connecting bolt into each of the diagonal bolt insertion holes to tightly connect the subsequent hexagonal segment to the previously arranged hexagonal segment;
A method for constructing a lining for a shield tunnel, using common connecting bolts having the same length as connecting bolts inserted into the outer diagonal bolt insertion hole and the inner diagonal bolt insertion hole. The second step and the third step are performed with the subsequent hexagonal segment being held in a holding section of the segment conveying device, and the hexagonal segment is separated from the holding section after the third step. 5. The method for constructing a shield tunnel lining according to 4 or 5 . Construction of a shield tunnel lining according to any one of claims 4 to 6, wherein the hexagonal segments are fastened together in the third step by an automatic fastening device conveyed by the conveyance device. Method.

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