JP3252939B2 - Joint structure of shield segment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure of a shield segment applicable to, for example, a tunnel shield method.

[0002]

2. Description of the Related Art Conventionally, in a tunnel by a shield method, a shield segment made of concrete (or resin concrete), which is divided in a circumferential direction and each of which is arc-shaped, is used. When assembling these shield segments, a plurality of shield segments are arranged in a zigzag pattern, and a cylindrical segment ring is formed by connecting circumferential end faces and axial end faces of each shield segment with bolts. I have.

FIG. 14 shows the appearance of a joint portion of a conventional shield segment to be assembled by bolts. In FIG. 14, reference numeral 80 denotes a shield segment main body (hereinafter, segment), and reference numeral 80a denotes a segment 80.
Reference numeral 80b denotes an axial end surface of the segment 80, respectively.

[0004] In the conventional segment 80, as shown in the figure, concave portions 81 and 82 generally called "box removal" are formed on a circumferential end surface 80a and an axial end surface 80b. And auxiliary fittings 83 and 84 for bolt fastening are inserted and fixed. And
When assembling the segment ring, refer to FIG.
As shown in (a) and (b), another segment 80 'is accessed from the circumferential direction or the axial direction of the segment 80, and its end faces are abutted against each other, and the auxiliary fittings 83, 8
A straight bolt 87 or a bent bolt 88 is passed through the bolt holes 85, 86 of the 3 '(84, 84'), and the nut 89 is tightened in one of the recesses. This operation is repeated to form a cylindrical segment ring. .

[0005]

However, in the joint structure of the segment ring described above, the large recesses 81 and 82 as the bolt accommodating portions must be formed in the segment 80 itself as shown in FIG. Therefore, there is a problem that the strength of the segment itself is low. In addition, in this structure, when the shield segment is propelled toward the other segment using an erector (not shown) or the like, the load concentrates on the auxiliary fittings 83 and 84, and the segment around the fitting becomes inconsistent. There is also a problem that the strength of the assembly itself is reduced due to chipping. Further, in order to assemble a segment ring using a large number of such segments 80, many bolts 87, 88 must be inserted and nuts 89 must be fastened, and the tightening work is limited in a narrow working environment. Therefore, the work itself requires a great deal of labor.

[0006] In addition, regarding this segment joint structure, there is also a joint in which the segments are engaged with each other by making the end face uneven, but a known joint has a degree of freedom (free rotation) in the contact surface between the segments. Degree), there is a problem that it is difficult to secure the roundness of the assembled segment ring itself.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a joint structure of a shield segment which can secure high rigidity and roundness of an assembled segment ring as a whole and can join segments with a small amount of labor. I do.

[0008]

According to the present invention, there is provided a joint structure for joining circumferential end faces or axial end faces of a shield segment divided in an arc shape . A structure is provided. Claim
In the invention described in (1), the joining is performed by sliding,
The end face of the
A concave portion from the near side and a convex portion from the other side.
As well as the concave and convex shapes are complementary and can engage with each other
Shield segment joint structure with various shapes
You. According to the second aspect of the present invention, the shield segment
The outer peripheral surface of the segment extends in the circumferential direction on one of the coupling end surfaces
To form a semi-circular convex part, and to this convex part on the inner peripheral surface.
Form a semi-circular recess of the same radius that continues smoothly,
On the other end surface, extend the inner peripheral surface of the segment in the circumferential direction
Form a semicircular convex part and smooth this peripheral part on the outer peripheral surface.
Sheet with a semicircular concave part of the same radius
There is provided a joint structure for a cold segment. Claim 3
In the invention described in the above, the shield segment having the configuration of claim 1 is provided.
In addition, extend both end faces in the circumferential direction
To form a semicircular convex part, and to the outer peripheral surface,
A semi-circular recess with the same radius that is continuous
Around the outer surface of the segment.
Direction to form a semi-circular projection and on the inner peripheral surface
A semicircular concave part of the same radius smoothly continuing to this convex part
Types of shield segments that form a shield segment
The joint structure of the shield segment that combines the
Provided. According to the fourth aspect of the present invention, the connection is slid.
At least one convex portion on one end surface.
And the other end face has a convex portion having the same shape as the convex portion.
The same number of recesses that can be engaged are formed, and the recesses include the shape of the protrusions.
The protrusion is formed larger than the protrusion, and the protrusion is located in the recess.
Shield that can be displaced in the segment sliding direction
A segment joint structure is provided.

[0009]

[Operation] One end of the shield segment has a projection or
A recess is formed, and at the end of the other shield segment to be joined to the segment end, a projection or a recess or projection having a shape complementary to the projection and engageable with the projection or recess is provided. By forming the segments, the segments are restrained from each other in the state where the concave and convex portions are engaged, so that the degree of freedom on the contact surface can be reduced and the roundness can be increased.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a shield segment joint structure according to the present invention. FIG. 1 shows a joint structure when an arc-shaped shield segment is assembled along a shield segment circumferential direction A to form a segment ring.

In FIG. 1, reference numerals 10 and 11 denote arc-shaped shield segments (hereinafter abbreviated as segments) constituting a segment ring, which are formed of a material such as steel, concrete, or resin concrete. Regarding the segment 10, its circumferential end face 2
In FIGS. 0 and 21, a triangular first convex portion 12 is formed on the other side (face side) in FIG. 1, and a triangular first concave portion 13 is formed on the near side (wellhead side). As shown, these first projections 12 are formed to have a triangular cross-section that gradually converges from the axial end face 22 on the face side of the segment 10 toward the wellhead side end face 23, and conversely, The one concave portion 13 gradually converges from the wellhead side toward the face side, and has a triangular cross section substantially the same as the convex portion 12. These convex portions 12 and concave portions 13 are formed such that their vertices coincide with each other at the axial center positions on the end surfaces 20 and 21.

On the other hand, the segment 11 to be joined to the segment 10 has a circumferential end face 20.
The second convex portion 12 'having the same shape as the first convex portion 12 is formed on the wellhead side (front side), and the second concave portion 13' having the same shape as the first concave portion 13 is formed on the face side. . The second convex portion 12 ′ is formed on the axial end face 2 of the segment 11 on the wellhead side.
The second concave portion 13 'has a triangular cross section that gradually converges from the face 3' toward the axial end face 22 'on the face side, and conversely gradually converges from the face side toward the wellhead side. On the other circumferential end face of the segment 11 not shown in FIG.
However, a second concave portion 13 'is formed on the near side.

[0013] Figure 2 is a shows the circumferential joint course of segment 10 and segment 11 due constructed joint structure as described above, (a) shows the joint before, (b) is in the middle of the bonding state Is shown. In addition, the joining illustrated illustrates the process of joining the above-described segment 10 to the segment 10 ′ integrated with the segment ring 10 ′ located on the wellhead side.

In the joining, first, as shown in FIG. 2A, the segment 10 is rotated in the circumferential direction by an unillustrated erector (handling device) or the like, and the end face 21 is aligned with the end face 20 of the segment 11. As shown in FIG. 2B, the segment 10 is axially moved to the wellhead side, that is, to the segment ring 10 '. As described above, the second convex portion 1 of the segment 11
2 ′ and the first concave portion 13 of the segment 10 are complementary to each other, and the second concave portion 13 ′ and the first convex portion 12 are also in a complementary relationship. , 12 ′ and recess 13,
13 'are engaged with each other so that the segments 10, 1
1 will be joined in the circumferential direction.

FIG. 3 shows an assembled state of the entire segment ring (tunnel) joined as described above. In this case, the segment assembled last in the circumferential direction corresponds to the above-described segment 10, and the concave portions 13 are formed at both ends 20, 21 in the circumferential direction so that the assembly can be easily accessed from the axial direction. Side (wellhead side)
And the convex portion 12 is formed on the near side (face side). In this assembly, the segment 10
The end face 21 of the segment 14 joined to the end face 20 of
A convex portion 12 'is formed on the back side and a concave portion 13' is formed on the front side,
The other end face has the opposite arrangement.

[0016] According to the first embodiment, by engaging the uneven portion of the triangular form in the end surface of the segment, it is possible to provide a bonding form that does not cause backlash, the segment itself without using bolts The external force can be countered by the joint of (1). Also, by positioning the assembled segments in the circumferential direction and sliding in the axial direction, the segments can be easily joined, the surface can be easily aligned, and the labor for mounting can be reduced. In this embodiment, the joining in the axial direction of the tunnel is carried out by using bolts as in the prior art.

Next, a description will be given of a joint structure according to a second embodiment of the present invention, which is different from the above-described joint structure. FIG. 4 shows the appearance of the segments constituting the joint structure.
In each of the embodiments described below, the same components as those in the joint structure of the first embodiment are denoted by the same reference numerals.

According to this embodiment, of the two segments to be joined, one of the segments 10 has, at one end in the circumferential direction, a semicircular projection 12 continuous with the segment outer peripheral surface 24 , The concave portion 13 which is continuous with the inner peripheral surface 25 is formed. These convex portions 12 and concave portions 13 are adjacent to each other so that their contour lines are smoothly continuous, and are formed along the segment axis direction. On the other hand, at the other end in the circumferential direction of the segment 10, on the other hand, a semicircular concave portion 13 continuous with the segment outer peripheral surface 25 and a convex portion 12 continuous with the segment inner peripheral surface 25 are formed respectively. You.

The arrangement of the concave and convex portions described above is exactly the same in the segment 11 to be joined to the segment 10, and the second convex portion 12 'and the second concave portion are provided at the respective circumferential ends. 13 'is similarly formed. In addition, as a deformation | transformation of this segment, what has a semicircular convex part in the outer peripheral surface side of the both ends in the circumferential direction, or what has a convex part in the inner peripheral surface side is considered.

FIG. 5 shows the segments 10 and 11 shown in FIG.
FIG. Thus, the joining allows the segment 10 to be accessed from the inside of the segment 11, and firstly, the first convex portion 12 continuously formed on the inner peripheral surface 25 of the segment 10 is connected to the inner peripheral surface 25 ′ of the segment 11. Is engaged with the second concave portion 13 'formed in the second concave portion.
At this time, the segment 10 is located at a position shifted inward from an imaginary circle continuing to the outer contour of the segment 11 as shown by a dotted line in the drawing, and the segment assembly Arrow C at circumferential free end
In the direction of. As a result, the segment 10 rotates as a fulcrum with the engagement surface with the segment 11, and the first concave portion 13 adjacent to the first convex portion 12 finally becomes the second convex portion of the segment 11 while maintaining the engagement relationship. At this point, the outer contours of both segments 10 and 11 are smoothly continuous (solid line position in FIG. 5). Since the joint structure of the segments 10 and 11 has a tom shape such that the thickness of the segment around the concave portion is sufficiently ensured from the viewpoint of strength, the inner periphery of the joint structure is assembled as shown in FIG. Some of the projections 12, 12 'located on the side of the surfaces 25, 25' protrude slightly inward from the inner peripheral surfaces 25, 25 '. There is no problem, and there is usually no problem since concrete is further driven into the inner peripheral surfaces 25 and 25 '.

FIG. 6 shows a segment 10 of the shape of FIG.
Fig . 14 shows an assembled state of the entire segments to be joined using the above-described deformed segments . Here, in addition to the segment 10 described above, two segments 15 each having a convex portion formed on the inner peripheral surface side of both ends in the circumferential direction as deformation segments ,
And a segment 16 having a convex portion formed on the outer peripheral surface side of both ends in the circumferential direction is used.
Can be easily assembled with other segments 10, 15, 16
And convex portions are formed on the outer peripheral surface side of both ends in the circumferential direction. Here, bolts are used for joining in the tunnel axial direction as in the prior art.

Next, a segment joint structure according to a third embodiment is shown in FIG. According to this embodiment, segment 10
At one end in the circumferential direction, an arc-shaped convex portion 12 is formed, and at the other end in the opposite circumferential direction, an arc-shaped concave portion 13 complementary to the convex portion 12 is formed. These convex portions 12 and concave portions 13 are formed such that their outlines are smoothly continued to the segment outer peripheral surface 24 and the inner peripheral surface 25, and extend along the segment axial direction. Note that the segment joint shape is exactly the same for the segment 11 to be joined to the segment 10, and the second end is provided at the end in the circumferential direction.
Are formed in the same manner as the convex portion 12 'and the second concave portion 13' (FIG. 8).

FIGS. 8A and 8B show the above segment 1
It shows an assembling method of 0,11. First, as shown in FIG.
2 is a segment 1 integrated with a segment ring 10 '.
Then, the segment 10 is slid toward the segment ring 11 side by a propulsion jack or the like as shown in FIG. FIG. 9 shows the end appearance of the segment ring assembled as described above. Here, in addition to the segments 10 and 11 described above, a small segment 18 for adjusting the circumference is used at the uppermost stage, and also in this case, bolts are used for joining in the tunnel axial direction as in the related art.

Finally, the segmentation according to the fourth embodiment of the present invention is described.
FIG. 10 shows a joint joint structure. In this example, the segment
The tip 10 itself is curved in an arc shape as in the previous embodiment.
Are concave on the circumferential end surfaces 20, 21 for end surface joining.
No convex part is formed, and two convex parts are formed on the axial end face 22.12
However, two concave portions 13 are formed in the other axial end surface 23.
Each is formed. FIG. 11 is an enlarged view of these convex portions 12.
FIG. 12 is an enlarged view of the recess 13. The convex portion 12 is
It is formed on the joint end face on the side of the wellhead, and its cross section is
When the ring is formed, the width of the ring
The base is formed in a trapezoidal shape so as to be integral with the end face 22.
Set to gradually increase its trapezoidal cross section
Is done. On the other hand, the recess 13 formed in the end face 23 is
It is usually formed on the joint end face on the face side, and its opening cross section is
When forming a ring,
It is formed in a trapezoidal shape to have a width,
3 so that the opening cross-sectional area gradually increases toward the bottom.
Is determined. In the present embodiment, the convex portion 12 has a circular shape.
The circumferential length is set slightly smaller than that of the recess 13.
It is.That is, the concave portion 13 receives the convex portion 12 as it is.
Including the shape, its width has been extended in the circumferential direction and expanded
It has a shape.This is the segment joining
The convex portion 12 is on the wide side of the concave portion 13In a state where there is roomInsertion
And then on the narrow side of the recess 13Slide itMoved
And the convex portion 12 and the concave portion 13 are engaged in a wedge shape.
In order to prevent the two from separating.

FIGS. 13A and 13B show the above segment 1
0 shows an assembling method. The joint is
As shown in (a), first, the two convex portions 12 of the segment 10 are engaged with the wide side of the concave portion 13 ′ of the two segments 11 using an erector or the like, and then the segment 10 is moved in the circumferential direction. By rotating, the convex portion 12 is displaced toward the narrow side of the concave portion 13 '. Thereby, finally (b)
As shown in (2), the two convex members 12 and the concave portions 13 'are closely fitted, and the segments 10 can be connected to the two segments 11 in a staggered manner from the axial direction.

It should be noted that the joint structure according to the fourth embodiment is different from the joint structure on the circumferential side in each of the above-described embodiments in addition to the fact that rolling does not occur between the segments at the design position when joining with the existing segments. Is a joint structure that can be assembled.

[0027]

As described above, according to the present invention , adjacent segments can be easily formed in the circumferential direction or the axial direction by the engagement of the corresponding concave and convex portions formed on the joint end surface. Since it is possible to fit into the joint, compared with the conventional joint structure connected by bolts, it is possible to counter external force by meshing the segments and reduce the number of missing parts to the segment, labor and material cost during segment production Can be reduced. In addition, the number of joints with bolts can be reduced, the segment assembling time can be greatly reduced, and work efficiency can be improved.

In addition, since the segment joining mode using the concave and convex portions has a structure capable of restricting the degree of freedom of the joining surface, the degree of freedom at the joining surface can be reduced, and the roundness of the segment ring can be improved.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a shield segment showing a joint structure according to a first embodiment of the present invention.

2 shows the circumferential joining process of the segments of FIG. 1;
(A) is an external view showing a state before joining , and (b) is an external view showing a state during joining .

FIG. 3 is an end appearance view of a segment tunnel assembled by the segments of FIG. 1;

FIG. 4 is an external perspective view of a shield segment showing a joint structure according to a second embodiment of the present invention.

FIG. 5 is an external view showing a method of assembling the segments of FIG. 4;

FIG. 6 is an end appearance view of a segment tunnel portion assembled by the segments of FIG. 4;

FIG. 7 is an external perspective view of a shield segment showing a joint structure as a third embodiment of the present invention.

8A and 8B show a joining process of the segments in FIG. 7, wherein FIG. 8A shows a state before joining and FIG. 8B shows a state after joining.

FIG. 9 is an end view of a segment ring assembled by the segments of FIG. 7;

FIG. 10 is an external perspective view of a shield segment showing a joint structure according to a fourth embodiment of the present invention.

FIG. 11 is an external perspective view in which a convex portion of the segment in FIG. 10 is enlarged.

12 is an external perspective view in which a concave portion of the segment in FIG. 10 is enlarged.

13 shows the joining process of the segments of FIG. 10,
(A) is the figure before joining, (b) is the figure which showed after joining, respectively.

FIG. 14 is an external perspective view of a conventional segment portion.

FIG. 15 is a cross-sectional view of the joint part of FIG.

[Explanation of symbols]

1,11,14,15,16,17,18 Shield segment 12 Projection (first projection) 12 'Projection (second projection) 13 Depression (first depression) 13' Depression (second 20, 21 Circumferential end face 22, 23 Axial end face 24, 24 'Outer peripheral face 25, 25' Inner peripheral face A Segment circumferential direction B Shield tunnel axial direction

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Naomichi Sawada 1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (56) References JP-A-52-18037 (JP, A) 3-224991 (JP, A) JP-A 4-117100 (JP, U) JP-A 54-116930 (JP, U) JP-A 3-99098 (JP, U) JP-B 56-41800 (JP, U) B2) Jiko 36-6834 (JP, Y1) Jiko 5-45678 (JP, Y2) Joko 51-32258 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) ) E21D 11/08 E21D 11/04

Claims (4)

(57) [Claims] 1. A shield segment divided into an arc shape.
A shield segment for joining the circumferential end faces (20, 21) or the axial end faces (22, 23) of (10).
The joint structure of (1), the circumferential end surface (20, 21)
The connection slides the shield segment (10) in the axial direction.
Ride and join axial end faces (22,23)
Slides the shield segment (10) in the circumferential direction.
Joint structure smell <br/> of shield segments performed by id Te, the slide coupled to <br/> end face of the shield segment (10) is a recess from the front side to initiate sliding joint
Forming, forming a convex portion from the other side, and the concave portion
The shape of the convex portion, the joint structure of the shield segments which is characterized in <br/> that the shape that can engage each other complementarily. 2. A shield segment divided into an arc shape.
(10) Shield segment that joins circumferential end faces
A joint structure of cement, one of the end faces to be bonded of the shield segment (10)
The other is to extend the outer peripheral surface of the segment in the
While forming a convex part, this convex part smoothly on the inner peripheral surface
Form a continuous semicircular concave portion of the same radius,
The other is a semicircular shape that extends the inner circumferential surface of the segment in the circumferential direction.
And a smooth surface on the outer peripheral surface.
And a semicircular concave portion having the same radius and being continuous with the concave portion of one shield segment.
With the convex part of the field segment inclined inward.
And the other end of the other shield segment is centered on the protrusion.
It is characterized by being rotated and assembled into a cylindrical shape
Joint structure of shield segment. 3. A shield segment divided into an arc shape.
Of the shield segment that joins the circumferential end faces of
In a hand structure, one of the end faces to be joined is
To form a semicircular convex part, and
A semicircular concave part of the same radius that continues smoothly to the convex part
Forming the other end face circumferentially around the inner circumferential surface of the segment.
To form a semicircular convex part,
A semicircular concave part of the same radius smoothly continuing to this convex part
The two end faces to be joined to the shield segment (10) formed with the inner peripheral surface of the segment extend in the circumferential direction.
While forming a long semicircular convex part, this convex
Form a semicircular concave part of the same radius that continues smoothly in the part
The both end faces to be joined with the shield segment (15) are extended in the circumferential direction on the outer peripheral face of the segment.
While forming a long semicircular convex part, this convex
Form a semicircular concave part of the same radius that continues smoothly in the part
Shield segments (16, 17) are provided, and these three types of shield segments are combined.
These recesses and projections are engaged to form a cylinder.
The joint structure of the shield segment. 4. A shield segment divided into an arc shape.
(10) circumferential end face (20, 21) or axial end face
Shield segment that joins end faces (22, 23)
The joint structure of (1), the circumferential end surface (20, 21)
The connection slides the shield segment (10) in the axial direction.
Ride and join axial end faces (22,23)
Slides the shield segment (10) in the circumferential direction.
Shield segment joint structure
To slide the shield segment (10).
At least one convex portion (12) is formed on one end surface
And the other end face has a projection having the same shape as the projection (12).
Segments forming the engageable many recesses (13), said recess is formed larger than the protrusions comprise the shape of the convex portion, the convex portion in the recess against
In the sliding direction, and the concave portion of one shield segment is larger than the convex portion.
Of the other shield segment
Engage the projection with a margin, and use the other shield
In the segment, the shape of the convex part matches the part of the concave part
And slide it to the side to assemble it into a cylinder.
Shield segment joint structure.