JP2658759B2 - Two-way wedge 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 used as a primary lining of a shield tunnel.

[0002]

2. Description of the Related Art The shield method is regarded as a core technology of the urban tunnel construction method, and its technical development is being actively developed. In particular, with regard to the joint structure of the segments, various developments have been made since the technology and the quality of the construction are important factors that also influence the success of the completed shield tunnel. FIG. 6 to FIG.
6 shows an example of a joint structure of a conventional shield segment disclosed in Japanese Patent Application Publication No. 996, FIG. 6 is a front view of the segment, FIG. 7 is a perspective view of a joint fitting embedded in the segment, and FIG. It is a perspective view. In the figure, a segment 1a is curved, and a joint plate 2a is mounted on a joint surface between the segment 1a and an adjacent segment 1b. A fitting metal 3a is embedded on the inner surface of the joint plate 2a at a predetermined interval in a rectangular parallelepiped shape having the same height as the joint plate 2a. As shown in FIG. 7, the joint fitting 3a (same for 3b) has a C-shaped cross section made of cast iron or the like, has a wedge hole 4a formed in the radial direction of the shield tunnel, and has a wedge of the joint plate 2a. A portion in contact with the hole 4a is open, and one of the wall surfaces of the wedge hole 4a is a gradient surface 5a having a gradient. A plurality of anchor rebars 6 are screwed to the side surface of the joint fitting 4a, and a screw hole 7a is formed at the entrance of the wedge hole 4a. Also, as shown in FIG.
a and 3b have the same cross-sectional shape as the cross-sectional shape of the wedge holes 4a and 4b formed when they come into contact with each other, and the inclined surface 5a of the wedge hole 4a
Has the same gradient as the gradient surface 5a. Reference numeral 10 denotes a bolt screwed into the bolt hole 7 of the fitting 3.

To connect the two segments 1a and 1b, the fittings 3a and 3b of the segments 1a and 1b are brought into contact with each other, and when the openings of the wedge holes 4a and 4b are aligned, the wedge holes 4a and 4b is formed, and the metal fitting 8 is inserted into the wedge holes 4a and 4b and press-fitted. Since the surfaces 9a and 9b of the connection fitting 8 have the same gradient as the sloped surfaces 5a and 5b of the joint fitting, the connection fitting 8 has a wedge-shaped
a, 4b, and acts to make the contact between the segments 1a, 1b more complete. After the fitting 8 is inserted, the bolt 10 is screwed into the bolt hole 7 to complete the connection.

[0004]

The above-mentioned conventional joint structure of the shield segment is an effective means for connecting the segments, but still has the following problems. Generally, in assembling segments, a gap between the existing segment and the new segment tends to occur with the progress of shield construction, and a great deal of labor and time is required to correct the gap and align the segments with high accuracy. And require. In the above-mentioned conventional example, when the connecting fitting 8 is fitted into the wedge holes 4a, 4b of the fitting, the slopes 9a, 9b of the connecting fitting 8 become the slopes 5a, 5
Since it comes into contact with b and performs the function of a wedge, it will correct the displacement of the segment, but since the gradient is only in the X direction,
Although displacement in the X direction can be corrected, displacement in the Y direction cannot be corrected. As a result, the adhesiveness between the inclined surfaces of the connection fitting and the joint fitting is deteriorated, loosening occurs between adjacent segments, the deformability of the segments in the annular direction, the roundness, etc. are reduced, and the discontinuity in the shield axial direction is reduced. The nature increases. Further, when the width of the groove of one fitting becomes large, the space formed by the groove becomes large, the cross section of the segment body is lost, the strength of the segment body is reduced, and the protrusion of the wall surface of the opening of the groove is deformed. Becomes relatively large, and the deformation increases with an increase in the load acting on the assembled segment ring, which leads to insufficient strength of the joint portion and a decrease in the water stoppage.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and provides a joint structure of a shield segment capable of correcting a displacement between segments and improving the strength of a joint portion. What you want to do.

[0006]

In order to achieve the above object, a joint structure of a shield segment according to the present invention comprises:
It is configured as follows. That is, a shield segment configured to dispose a plurality of connection fittings at predetermined intervals at contact portions of adjacent segments, and connect the opposed connection fittings of the adjacent segments by connection fittings. In the joint structure of the above, the connection fitting is,
Having two symmetrical grooves formed in the radial direction of the shield tunnel constituted by the segments,
Two orthogonal wall surfaces of the four wall surfaces forming the respective grooves have a gradient, and the connecting metal fittings are orthogonal to the grooves of the two connecting metal fittings so as to be able to cope with a deviation in two directions. It was formed in the shape of a wedge having the same gradient surface as the gradient of the two wall surfaces, and was configured so as to be able to be fitted over both grooves of the connection fittings of the adjacent segments facing each other.

[0007]

When the connection fitting is connected with the connection fitting, the connection fitting inserted into the groove of the connection fitting is inserted along the slope forming the groove on the slope. At this time, since the slope surface of the groove and the slope surface of the connection fitting have the same slope, the fitting of the connection fitting to the connection fitting is performed smoothly, and the close contact between the slope faces of both fittings is also good. Furthermore, since the above-mentioned inclined surface is two orthogonal wall surfaces of the groove formed in the connection fitting, the segment is formed in the X direction and the Y direction by inserting a two-way wedge-shaped connection fitting into the groove of the connection fitting. The movement is parallel in both directions, and the displacement of the position of the adjacent segment is corrected in both the X and Y directions.

[0008]

Embodiment 1 FIGS. 1 and 2 show an embodiment of the present invention.
FIG. 2 is a perspective view of a composite segment.
As shown in the figure, in the RC segment 20 or the composite segment 30 having the joint structure according to the present invention, a plurality of connection fittings 21 or 31 are provided within a segment at a predetermined interval at a connection portion with an adjacent segment. They are embedded and arranged. In the drawing, 22 is the main girder surface, 23 is the end surface,
24 is concrete, 32 is a main girder plate, 33 is an end plate, 34 is a strut, 35 is a surface plate,
36 is concrete. The connection fittings 21 and 3
1 has the same shape. Hereinafter, the RC segment 20 will be described in detail.

FIG. 3 is a perspective view of opposing connection fittings 21 disposed on two adjacent segments 20, and FIG. 4 is fitted to the opposing connection fittings to connect the opposing connection fittings. FIG. 2 is a perspective view of a connecting metal fitting 50 for connection. As shown in the figure, two grooves 41a and 41b are formed in the connection metal fitting 21 in the radial direction of the shield tunnel formed by the segments, and the cross-sectional shape is formed in an E-shape. Of the wall surfaces forming the grooves 41a and 41b, 44a, 4
The four planes 4b, 45a, and 45b are upright planes, but the four orthogonal planes 42a, 42b, and 43a, 43b are provided with gradients. 46a and 46b are upright surfaces.
A plurality of anchor rebars 48 are screwed to the back surface of the connection fitting 21 to improve the integration with the segments. 4 is a pair of fittings 5 having the same shape.
The fittings 50a and 50b are formed in a concave cross section and formed by the grooves 41a and 41a of two opposing connecting fittings 21 when the fittings 50a and 50b are inserted into the connecting fittings 21 of the adjacent segments. The groove is formed in a shape that can be inserted into the groove formed by the groove or the groove formed by the grooves 41b. That is, the outer surface 51a of the connection fitting 50a has the same gradient as the wall surface 42a of the groove 41a of the connection fitting 21,
The groove inner surface 55a of the connection fitting 50a is
It has the same gradient as a. As a result, the connection fitting 50a,
50b is formed with a thickness t ₁ of the lower end in a wedge shape which is thinner than the thickness t ₂ of the upper end.

To connect adjacent segments 20,
The opposite connecting metal fittings 21 of both segments 20 are brought into contact with each other, and grooves 41a, 41a and 41b formed by two adjacent connecting metal fittings 21 as shown in FIG.
The connecting fittings 50a and 50b are inserted into 41b. As a result, the connection fittings 50 of the adjacent segments 20 are connected to each other by the connection fitting 50, and the adjacent segments are connected. At this time, the connecting fitting 50 is formed in a wedge shape, the outer surface 51a has the same gradient as the groove wall surface 42a of the connecting fitting 21, and the groove inner surface 55a of the connecting fitting 50 has the groove wall surface of the connecting fitting 21. Since it has the same gradient as 43a, the fitting of the connecting fitting 50 to the connecting fitting 21 is performed smoothly, and the adhesion is perfect. As a result, as shown in FIG. 5, even if the adjacent segments are displaced in the Y direction, the displacement is corrected by press-fitting the connection fitting 50 into the grooves 41a, 41a of the connection fitting 21, and the center in the segment connection is corrected. Dashi is done completely.
Immediately after that, since the inclined surfaces 42a and 43a where both are fitted are orthogonal to each other, the displacement in the X direction is corrected in the same manner, and the fastening is completely performed.

Embodiment 2 Although the above embodiment has been described for the RC segment, the same configuration can be applied to the composite segment. Further, the number and shape of the grooves 41a, b formed in the connection fitting 21 are not limited to those of the above-described embodiment.

[0012]

According to the present invention, a plurality of connecting metal fittings are arranged at predetermined intervals at connecting portions of adjacent segments, and the connecting metal fittings of the adjacent segments are connected by connecting metal fittings. In the joint structure of the shield segment configured as described above, the connection fitting has two symmetrical grooves formed in the radial direction of the shield formed by the segments, and the four wall surfaces forming the grooves Two orthogonal wall surfaces are provided with a slope, and the connection fitting is formed in a concave wedge shape having a slope surface having the same slope as the slope of the wall face of the groove of the connection fitting. Since the fitting can be fitted over both grooves of the metal fitting, the following excellent effects are obtained. (1) In the assembly of segments, complicated secondary positioning operations such as step adjustment of joints of automatic assembly robots (correction of deviation between existing and new segments) are simplified, and the deviation between segments is copied. Since the segments can be fastened simply by inserting and connecting the connecting fittings, the segment positioning work process performed by the automatic assembling robot can be shortened, and the entire construction period can be shortened. (2) Since the cross-sectional shape of the connection fitting is formed in a concave wedge shape, and its slope surface has the same slope as the slope face of the groove of the connection fitting, the connection fitting is independent of the form of displacement between the segments. This makes it easy to insert and insert into the connection metal fitting, and has good adhesion between the two after the insertion, so that a stable and large fastening force can be obtained. (3) The cross-sectional shapes of the connection fittings and the connection fittings were adapted as E-shaped and concave, and the rigidity and strength of the joint were improved, so that a strong joint was formed and the resistance to deformation was increased. (4) As a result, dimensional accuracy such as roundness of the connected and completed shield tunnel is improved, continuity in the shield axis direction is increased, and workability, roundness, deformability and other reliability are improved. . (5) Furthermore, in response to the current demand for labor-saving and speeding-up work with the automation of shield construction, the labor saving and speeding up of positioning work in segment assembly work in overall shield construction has been made possible.

[Brief description of the drawings]

FIG. 1 is a perspective view of an RC segment according to an embodiment of the present invention.

FIG. 2 is a perspective view of a composite segment according to another embodiment of the present invention.

FIG. 3 is a perspective view of a connection fitting.

FIG. 4 is a perspective view of a connection fitting.

FIG. 5 is a perspective view of a connection fitting inserted into the connection fitting.

FIG. 6 is a front view showing a joint structure of a conventional shield segment.

FIG. 7 is a perspective view of a joint fitting having the joint structure.

FIG. 8 is a perspective view of a connection fitting having the joint structure.

[Explanation of symbols]

 20 RC segment 21 Connection fitting 22 Main girder surface 23 End surface 24 Concrete 30 Concrete 30 ............ Synthetic segment 31 ...... Connecting bracket 32 ...... Main girder plate 33 ...... End plate 34 ...... Strut 35 ...... Surface Plate 36 ... Concrete 41a, 41b Groove 42a, 42b Slope 43a, 43b Slope 44a, 44b Upright 45a, 45b Upright 46a, 46b Upright 48 ... … Anchor rebar 50 …………… connecting fittings 50a, 50b… connecting fittings 51a, 51b… inclined faces 52a, 52b… upright faces 53a, 53b… upright faces 54a, 54b…

Claims (1)

(57) [Claims] 1. A shield comprising a plurality of connecting fittings arranged at predetermined intervals at contact portions of adjacent segments, and connecting the connecting fittings of the adjacent segments by connecting fittings. -In the joint structure of the segment, the connection fitting has two symmetrical grooves formed in the radial direction of the shield tunnel formed by the segments, and among the four wall surfaces forming the respective grooves, The two orthogonal wall surfaces have a slope, and the connecting fitting is formed in a wedge shape with an outer surface having the same slope as the slope of the wall face of the groove of the connecting fitting, and is opposed to the adjacent segment. A two-way wedge joint structure for a shield segment, wherein the structure is adapted to be fitted over both grooves of a connection fitting.