JP3819122B2 - segment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
This invention relates to the segment which comprises a cylindrical wall body in the axial direction of a digging hole by connecting two or more mutually.
[0002]
[Prior art]
As a method for constructing a tunnel, a so-called shield method is generally used in which segments are assembled on the inner surface side of a drilling hole to construct a cylindrical wall body.
As shown in FIG. 6, the segments used in this shield method are rectangular in plan view and in the shape of an arc plate, and these segments 1 are joined together with joint plates 3 provided on the joining end surface 2 thereof. Were connected by bolts and nuts.
That is, the ground is excavated by the shield machine, and the segment 1 is assembled along the inner surface of the excavation hole in the excavation hole formed on the rear side thereof, and the joining end surface 2 along the axial direction is sequentially joined and connected. By forming an endless ring body and connecting the ring body in the axial direction of the excavation hole, a cylindrical wall body is constructed on the inner surface of the excavation hole.
Reference numeral 4 in the figure denotes a sealing material provided on the joining end surface 2 of the segment 1, and the joining portion of the segments 1 joined together is sealed by the sealing material 4.
[0003]
[Problems to be solved by the invention]
By the way, as shown in FIG. 7, the shield machine for excavating the excavation hole extends the plurality of jacks 6 provided on the rear side thereof so as to obtain propulsive force from the already assembled cylindrical wall T. It has become.
For this reason, since a large force is applied to the segment 1 constituting the cylindrical wall body T that has already been assembled in the width direction, the corner portion bites into the joining end surface 2 of the adjacent segment 1 and locally. A large stress is generated. In particular, when the cylindrical wall body T has a large cross section or the cylindrical wall body T is constructed at a large depth, since the shield machine requires a large driving force, the local stress is further increased. There was no fear of causing cracks or the like in the segment 1.
Further, even when earth pressure is applied to the cylindrical wall body T after construction, there is a possibility that a large stress is generated in the adjacent segments 1 by the corners of the segments 1 as described above.
[0004]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a segment that is not likely to be damaged by local stress even if an external force is applied to the cylindrical wall body.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the segments according to claim 1 are segments that form a cylindrical wall body in the axial direction of the excavation hole by joining to each other, and are joined to each other in the axial direction of the excavation hole. A longitudinal joining end face and a joining end face in the width direction joined together in the circumferential direction of the excavation hole, and the joining end face in the longitudinal direction is formed from at least the joining end face in the longitudinal direction and the joining end face in the width direction. The vicinity of the corner is formed in a curved shape in plan view that is slightly bulged outward.
The segments according to claim 2 are segments constituting a cylindrical wall body in the axial direction of the excavation hole by joining to each other, and joining end surfaces in the longitudinal direction joined to each other in the axial direction of the excavation hole; A joint end face in the width direction joined to each other in the circumferential direction of the excavation hole, and the joint end face in the width direction is at least near the corner formed by the joint end face in the longitudinal direction and the joint end face in the width direction. It is characterized by being formed in a curved shape in plan view that is slightly bulged in the direction.
[0006]
The segments according to claim 3 are segments constituting a cylindrical wall body in the axial direction of the excavation hole by joining to each other, and joining end surfaces in the longitudinal direction joined to each other in the axial direction of the excavation hole; A joining end face in the width direction joined to each other in the circumferential direction of the excavation hole, and the joining end face in the longitudinal direction and the joining end face in the width direction are formed from at least the joining end face in the longitudinal direction and the joining end face in the width direction, respectively. The vicinity of the corner is formed in a curved shape in plan view that slightly bulges outward.
The segment according to claim 4 is the segment according to any one of claims 1 to 3, wherein a cross-sectional shape in a thickness direction of the joining end surface in the longitudinal direction and the joining end surface in the width direction is slightly expanded outward. It is characterized by its shape.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the segments of the embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the concrete segment 11 of the present embodiment has a curved shape in plan view in which the joint end surface 12 a in the longitudinal direction slightly bulges outward in the joint end surface 12. Yes. Further, the joining end surface 12a in the longitudinal direction and the joining end surface 12b in the width direction of the segment 11 have a shape in which the cross-sectional shape in the thickness direction slightly bulges outward as shown in FIG. .
[0008]
Next, the case where the cylindrical wall body T is constructed | assembled using the said segment 11 is demonstrated.
After the excavation hole is formed in the ground by the shield machine, the endless ring body is constructed by joining and connecting the joint plates 3 of the joint end surface 12b in the width direction of the segment 11 to each other with bolts and nuts in the excavation hole. Then, the ring bodies are connected to each other in the axial direction of the excavation hole by joining and connecting the joint plates 3 of the joining end surfaces 12a in the longitudinal direction of the segments 11 constituting the ring body with bolts and nuts.
[0009]
If it does in this way, the cylindrical wall body T which consists of the segment 11 will be built in the excavation hole excavated by the shield machine.
Thereafter, the ground is further excavated by the shield machine, and the tubular wall body T is constructed by the segment 11 as described above in the excavation hole formed at the rear thereof.
[0010]
Here, when excavating the ground with this shield machine, as described above, a plurality of jacks 6 provided in the shield machine are extended to obtain a propulsive force from the rear-side cylindrical wall body T that has already been constructed. Therefore, the segment 11 constituting the cylindrical wall body T receives a large compressive force in the axial direction of the excavation hole. However, the segment 11 has a joint end surface 12a in the longitudinal direction slightly outward in advance. Since it has a bulged curved shape in plan view, even if a large compressive force is applied to the segments 11 constituting the cylindrical wall body T, the joining end surfaces 12a in the longitudinal direction of the adjacent segments 11 where the corners of the segments 11 are adjacent to each other. Therefore, it is possible to eliminate the occurrence of segment breakage, damage, etc. due to this stress concentration.
[0011]
Thereby, when propelling the shield machine, it is extremely suitable for the construction of the cylindrical wall body T having a large cross section or the cylindrical wall body T at a great depth, which applies a particularly large compressive force to the cylindrical wall body T. Can be used.
[0012]
In addition, since the cross-sectional shape in the thickness direction of the joining end surface 12a in the longitudinal direction and the joining end surface 12b in the width direction is slightly bulged outward, a large compressive force is exerted on the joining portion between the segments 11 Even if added, stress concentration at the upper and lower corners of the segment 11 can be reduced, thereby preventing breakage, damage and the like at the upper and lower corners of the segment 11.
[0013]
Next, the segment 11 of another embodiment will be described.
As shown in FIG. 3, the segment 11 has a curved shape in plan view in which the joining end surface 12 b in the width direction slightly bulges outward. Also in the case of this segment 11, the cross-sectional shape in the thickness direction of the joining end surface 12a in the longitudinal direction and the joining end surface 12b in the width direction is a shape that slightly bulges outward.
[0014]
And according to the segment 11 of this shape, after constructing the cylindrical wall T, earth pressure is applied to the cylindrical wall T, and the compressive force is applied to the segment 11 in the longitudinal direction, that is, in the circumferential direction. Even if it acts, since the joint end surface 12b in the width direction has a curved shape in plan view in which the joint end surface 12b is slightly bulged outward, the joint end surface in the longitudinal direction of the adjacent segment 11 is the corner of the segment 11 It does not bite into 12a and cause a large stress concentration. Therefore, breakage, damage, etc. of the segment 11 due to this stress concentration can be eliminated.
Thereby, when constructing the cylindrical wall body T at a great depth to which a particularly large earth pressure is applied, it can be used very suitably.
[0015]
In addition, the longitudinal direction joining end surface 12a and the widthwise joining end surface 12b are slightly bulged outward, respectively, and the longitudinal joining end surface 12a and the width shown in FIG. The cross-sectional shape in the thickness direction of the joining end surface 12b in the direction is a shape that slightly bulges outward.
That is, according to the segment 11 of this shape, the cylindrical wall T has a compressive force in the width direction (axial direction) applied to the jack 6 of the shield machine and a compressive force in the longitudinal direction (circumferential direction) due to earth pressure. Even if added, it is possible to prevent the corner 11 of the segment 11 from biting into the adjacent segment 11, thereby preventing stress concentration due to the biting of the corner and possibly causing breakage, damage, etc. of the segment 11. The cylindrical wall body T that can be reliably eliminated and is extremely reliable can be constructed.
[0016]
In addition, in the segment 11 of the said embodiment, although the whole joining end surface 12a of the longitudinal direction and the whole joining end surface 12b of the width direction were made into the shape which protruded slightly outward, as shown in FIG. Even in the segment 11 in which only the vicinity of the corner formed by the joining end surface 12a in the direction and the joining end surface 12b in the width direction is the curved surfaces 12a 'and 12b', and the other portions are the planes 12a "and 12b". Similar effects can be obtained.
[0017]
【The invention's effect】
As described above, according to the segment of the present invention, the following effects can be obtained.
According to the segment of claim 1, even when a large compressive force is applied to the segment constituting the cylindrical wall body by the jack of the shield machine during ground excavation by the shield machine, at least the vicinity of the corner portion at the joint end surface in the longitudinal direction is present. Since it has a curved shape in plan view that is slightly bulged outward in advance, the corners of the segments may bite into the joining end surfaces in the longitudinal direction of adjacent segments, causing a large stress concentration. Therefore, the occurrence of breakage, damage, etc. of the segment due to this stress concentration can be eliminated.
As a result, when propelling a shield machine, it is particularly suitable for construction of a cylindrical wall body with a large cross section or a cylindrical wall body at a great depth, which applies a particularly large compressive force to the cylindrical wall body. Can do.
[0018]
According to the segment of claim 2, at least in the width direction, even if the earth wall is applied to the cylindrical wall body and a compressive force is applied to the segment in the longitudinal direction after the cylindrical wall body is constructed. Since the vicinity of the corner of the joint end surface is curved in advance in a plan view slightly bulging outward, the corner of the segment bites into the joint end surface in the longitudinal direction of the adjacent segment, resulting in large stress Concentration does not occur, and therefore, breakage, damage, etc. of the segment due to this stress concentration can be eliminated.
Thereby, when constructing a cylindrical wall body at a great depth to which a large earth pressure is applied, it can be used very suitably.
According to the segment of Claim 3, even if the compressive force in the width direction applied to the jack of the shield machine and the compressive force in the longitudinal direction due to earth pressure are applied, at least in the joint end surface in the longitudinal direction and the joint end surface in the width direction Since the vicinity of the corner is a curved shape in plan view that is slightly bulged outwardly in advance, it is possible to prevent the corner of the segment from biting into an adjacent segment. Stress concentration due to biting can be prevented, and the possibility of breakage, damage, etc. of the segment can be surely eliminated, and a highly reliable cylindrical wall body can be constructed.
[0019]
According to the segment of claim 4, since the cross-sectional shape in the thickness direction of the joining end face in the longitudinal direction and the joining end face in the width direction is a shape slightly bulging outward, joining the segments Even if a large compressive force is applied to the location, the stress concentration at the upper and lower corners of the segment can be reduced, thereby preventing breakage and damage at the upper and lower corners of the segment.
[Brief description of the drawings]
FIG. 1 is a plan view of a segment for explaining the shape of the segment according to the embodiment of the present invention.
FIG. 2 is a cross-sectional view of a segment for explaining the shape of the segment according to the embodiment of the present invention.
FIG. 3 is a plan view of a segment for explaining the shape of the segment according to another embodiment of the present invention.
FIG. 4 is a plan view of a segment for explaining the shape of the segment according to another embodiment of the present invention.
FIG. 5 is a plan view of a segment for explaining the shape of the segment according to another embodiment of the present invention.
FIG. 6 is a perspective view of the segment for explaining the configuration and structure of the segment constituting the cylindrical wall body.
FIG. 7 is a schematic side view of a cylindrical wall body for explaining how to construct the cylindrical wall body by a shield method.
[Explanation of symbols]
11 Segment 12a Bonding end surface 12b in the longitudinal direction Bonding end surface T in the width direction Cylindrical wall

Claims (4)

A segment that forms a cylindrical wall body in the axial direction of the excavation hole by joining together,
A longitudinal joining end face joined to each other in the axial direction of the drilling hole, and a joining end face in the width direction joined together in the circumferential direction of the drilling hole,
The joining end surface in the longitudinal direction is formed in a curved shape in plan view in which at least the vicinity of the corner formed from the joining end surface in the longitudinal direction and the joining end surface in the width direction is slightly bulged outward. And a segment. A segment that forms a cylindrical wall body in the axial direction of the excavation hole by joining together,
A longitudinal joining end face joined to each other in the axial direction of the drilling hole, and a joining end face in the width direction joined together in the circumferential direction of the drilling hole,
The bonding end surface in the width direction is formed in a curved shape in plan view in which at least the vicinity of the corner formed from the bonding end surface in the longitudinal direction and the bonding end surface in the width direction is slightly bulged outward. And a segment. A segment that forms a cylindrical wall body in the axial direction of the excavation hole by joining together,
A longitudinal joining end face joined to each other in the axial direction of the drilling hole, and a joining end face in the width direction joined together in the circumferential direction of the drilling hole,
The joining end surface in the longitudinal direction and the joining end surface in the width direction have curved shapes in plan view in which at least the vicinity of the corners formed from the joining end surface in the longitudinal direction and the joining end surface in the width direction are slightly bulged outward. A segment characterized by being formed. The cross-sectional shape in the thickness direction of the joining end surface in the longitudinal direction and the joining end surface in the width direction is a shape slightly bulging outward, wherein any one of claims 1 to 3 is characterized. The stated segment.

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