JP4227715B2 - segment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a segment, and more particularly to a technique for facilitating assembly adjustment.
[0002]
[Prior art]
A segment used for shield construction includes a plurality of segment pieces that are assembled and installed in a ring shape or a cylindrical shape along a tunnel excavation surface by being connected to each other in the circumferential and axial directions.
[0003]
This type of segment piece is usually made of reinforced concrete, and a joint plate provided with a bolt insertion hole on one side is provided at the joint part between the segment pieces, and a female screw for screwing a tightening bolt is provided on the other side. And an insert anchor provided.
[0004]
In such a connection joint portion, when the segment pieces are joined together, an alignment portion that aligns the centers between the bolt insertion hole and the female screw portion with each other and an uneven fitting portion to prevent shaking are provided. The tightening bolt is screwed into the bolt insertion hole in a state of being aligned and connected to the bolt insertion hole.
[0005]
In order to facilitate the insertion of the tightening bolt, such a concave / convex fitting portion for alignment is generally provided with a clearance of about 5 mm. However, the conventional segment having such a structure has the following technical problems.
[0006]
[Problems to be solved by the invention]
In other words, when assembling the annular segment by connecting the segment pieces in the circumferential direction, if there is a clearance of 5 mm in the concave / convex fitting portion, a slight rolling will be accumulated, exceeding the allowable allowable value, and tightening. It may be difficult to fasten the bolt.
[0007]
In order to prevent such problems, for example, if the clearance is reduced in structure, it is difficult to correct the generated rolling, or there is no allowance, so if it is forcibly connected, the cause of the cracking of the segment piece It becomes.
[0008]
The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a segment that can be easily bolted without structurally reducing the clearance. Is to provide.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention includes a plurality of segment pieces that are assembled and installed in an annular shape along a tunnel excavation surface by being connected to each other in the circumferential and axial directions. In the segment provided with the concave and convex fitting part for alignment in the part , comprising a ring-shaped aligning material installed so as to protrude from either one of the opposing fitting surfaces of the concave and convex fitting part, The ring-shaped alignment material has a plurality of thin portions and thick portions provided on either one of the inner and outer peripheral surfaces, and the thin portions and thick portions are alternately arranged along the circumferential direction. .
In addition, the present invention includes a plurality of segment pieces that are assembled and installed in a ring shape along the tunnel excavation surface by being connected to each other in the circumferential and axial directions, and the connecting joint portion between the segment pieces is used for alignment. In the segment provided with the concave / convex fitting portion, the ring-shaped alignment member is provided with a ring-shaped alignment member installed so as to protrude from one of the opposing fitting surfaces of the concave / convex fitting portion to the other. Has a plurality of thin portions and thick portions provided on any one of the inner and outer peripheral surfaces, and the segments configured in this manner are alternately arranged along the axial direction with the thin portions and thick portions. According to the above, since the ring-shaped alignment material is installed in the concave / convex fitting portion for alignment, the clearance is reduced according to the protruding amount of the ring-shaped alignment material, the assembly accuracy is improved, and the segment piece To prevent rolling in between It becomes ability.
The ring-shaped alignment material can be attached to the convex portion tip of the concave-convex fitting portion. According to this configuration, the ring-shaped alignment material can be easily attached.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings. 1 to 6 show examples of basic structures of segments according to the present invention. The segment 10 shown in the figure includes a plurality of first and second segment pieces 12 and 14 which are assembled in an annular shape and a cylindrical shape along a tunnel excavation surface by being connected to each other in the circumferential direction and the axial direction. .
[0011]
In the case of this structural example, the case where the first and second segment pieces 12 and 14 installed along the tunnel axis direction are connected to each other is illustrated, and the first and second segment pieces 12 and 14 are connected to each other. In the connecting joint portion, an insert anchor 16 is provided at the end of the first segment piece 12, and a joint plate 18 is provided at the end of the second segment piece 14.
[0012]
The insert anchor 16 is formed in a substantially cylindrical shape, is embedded in the first segment piece 12, and is provided with a female screw portion 20 on the inner peripheral surface of a hole drilled on the central axis.
[0013]
The joint plate 18 provided in the second segment piece 14 separates a bolt box when the tightening bolt 22 is mounted, and a bolt insertion hole 24 opened to the connection end side of the second segment piece 14 is provided. Is provided.
[0014]
In such a connection joint portion, when the segment pieces 12 and 14 are joined together, in order to prevent the centering and the centering between the bolt insertion hole 24 and the female screw portion 20 to coincide with each other. An uneven fitting portion 26 is provided.
[0015]
The concave / convex fitting portion 26 of this structural example includes a concave portion 28 provided on the insert anchor 16 side and a convex portion 30 provided on the joint plate 18 side. The recess 28 is formed on the outer peripheral edge of the open end of the female screw portion 20 provided in the insert anchor 16 so that the diameter gradually increases toward the outside, and is formed concentrically with the female screw portion 20. Yes.
[0016]
The convex portion 30 is formed so as to protrude from the outer peripheral edge of the bolt insertion hole 24 of the joint plate 18 and is formed concentrically with the bolt insertion hole 24. A clearance δ of about 5 mm is formed between the concave portion 28 and the convex portion 30 of the concave / convex fitting portion 26 formed in this manner in the fitted state, as in the conventional segment piece of this type. The basic configuration of the segment 10 is substantially the same as that of the conventional example, but the segment 10 of the present structural example is characterized by the following points.
[0017]
That is, in the segment 10 of this structural example, the ring-shaped alignment material 32 that can be compressed and deformed is provided on the fitting surface on the concave portion 28 side of the concave-convex fitting portion 26. The ring-shaped alignment material 32 is made of, for example, hard plastic or rubber.
[0018]
Details of the ring-shaped alignment material 32 are shown in FIGS. The ring-shaped alignment material 32 of this structural example has a funnel shape with both ends opened, and the outer peripheral side is fitted and fixed to a groove 34 formed on the fitting surface of the recess 28. The alignment material 32 has an outer peripheral surface along the inclination of the groove portion 34, a thin portion 36 is formed at one end side opening in the axial direction, and the other end side opening is a thick portion 38.
[0019]
The ring-shaped alignment material 32 formed in this way is disposed so that the thin portion 36 side is positioned in the insertion direction of the convex portion 30. Further, as shown in FIG. 2, the minimum inner diameter of the ring-shaped alignment material 32 is convex when the concave and convex fitting portion 26 is fitted and the joint plate 18 is in contact with the end surface of the insert anchor 16 when facing each other. The size is such that a predetermined interval δ ₁ is maintained between the outer diameter of the portion 30.
[0020]
When the ring-shaped alignment member 32 is provided in the concave portion 28 of the concave-convex fitting portion 26, when connecting the first and second segment pieces 12, 14, the convex 30 is fitted and inserted into the concave portion 28. This is performed by aligning the axis of the screw portion 20 and the bolt insertion hole 24 and screwing the tightening bolt 22 into the female screw portion 20.
[0021]
In this case, when there is no misalignment and the first and second segment pieces 12 and 14 are connected, as shown in FIG. 5, the ring-shaped alignment material 32 is not deformed because it does not receive an external force.
[0022]
However, when the first and second segment pieces 12 and 14 are connected in a state where the core is displaced, as shown in FIG. 6, the ring-shaped core member 32 receives a biased external force and is compressed and deformed on one side. It becomes a state.
[0023]
In this case, if the ring-shaped alignment material 32 is not provided, the second segment piece 14 is eccentric by the clearance δ provided in the concave-convex fitting portion 26. As a result, the rolling is accumulated and can be connected. The allowable value is exceeded, and fastening of the fastening bolt 22 becomes difficult.
[0024]
However, in the case of this structural example , by providing the ring-shaped alignment material 32, the clearance leading to the substantial eccentricity of the second segment piece 14 is reduced, so that the assembly accuracy is improved and the segment piece 12 is improved. , 14 can be prevented from rolling.
[0025]
Further, in the case of this structural example, the portion where the clearance is small is only the linear portion provided with the ring-shaped alignment material 32, so that the clearance is reduced as in the case where the clearance is structurally reduced. It does not become difficult to correct or cause cracks due to the lack of margin.
[0026]
Further, since the ring-shaped core member 32 can be compressed and deformed, the clearance can be made flexible by compressing and deforming, and the assembly adjustment of the segment 10 becomes easy.
[0030]
FIG. 7 shows a first embodiment of a segment according to the present invention . The same or corresponding parts as those in the structural example are given the same reference numerals and the description thereof is omitted. Only explained.
[0031]
This figure is a detailed view of the ring-shaped alignment material 32b disposed in the recess 28 of the concave-convex fitting portion. The alignment material 32b of this embodiment is similar to the structural example in that the thin-wall portion 320b and the thick-wall portion In the case of this embodiment, these are alternately formed along the circumferential direction on the inner peripheral surface side.
[0032]
When the ring-shaped alignment material 32b having such a shape is used, when the alignment material 32b is compressed and deformed, the thin portions 320b are disposed on both sides of the thick portion 321b, so that the thick portion 321b is compressed and deformed. Since the gap at the time of forming is formed in the portions of the thin portions 320b on both sides, the deformation of the thick portion 321b is further facilitated.
[0033]
FIG. 8 shows a second embodiment of the segment according to the present invention . The same or corresponding parts as those in the structural example are given the same reference numerals and the description thereof is omitted. Only explained.
[0034]
This figure shows a case where a ring-shaped alignment material 32c is arranged on the convex portion 30 side of the concave-convex fitting portion, and the alignment material 32c of this embodiment is similar to the first embodiment in that the thin-walled portion 320c and In the case of this embodiment, these are alternately formed on the outer peripheral surface side along the circumferential direction. Even when the ring-shaped core material 32c having such a shape is used, the same effect as that of the above embodiment can be obtained.
[0035]
FIG. 9 shows a third embodiment of the segment according to the present invention . The same or corresponding parts as those in the structural example are given the same reference numerals and the description thereof is omitted. Only explained.
[0036]
This figure shows a case where a ring-shaped alignment material 32d is arranged on the convex portion 30 side of the concave-convex fitting portion, as in the second embodiment, and the alignment material 32d of this embodiment includes a thin portion 320d and In the case of this embodiment, these are alternately formed in a plurality of stages along the axial direction on the outer peripheral surface side. Even if the ring-shaped core material 32d having such a shape is used, the same effect as that of the above embodiment can be obtained.
[0037]
FIG. 10 shows a fourth embodiment of the segment according to the present invention . The same or corresponding parts as those in the structural example are given the same reference numerals and the description thereof is omitted. Only explained.
[0038]
This figure shows the case where the ring-shaped alignment material 32e is arranged on the convex part 30 side of the concave-convex fitting part, as in the second example , but in the case of this example, the tip of the convex part 30 and The outer surface and the inner surface of the insertion hole 24 are configured to be mounted on the tip side of the convex portion 30.
[0039]
That is, the ring-shaped alignment material 32e of the present embodiment has a substantially U-shaped cross section, and has a structure in which the tip of the convex portion 30 is covered with the sum. In this case, it is desirable that the outer thickness of the ring-shaped alignment material 32e be formed in a tapered shape so that the thickness gradually increases from the inside of the convex portion 30 toward the tip side.
[0040]
In addition, the inner thickness of the ring-shaped alignment material 32e is set to a thickness that does not hinder the clearance between the inner diameter of the insertion hole 24 and the outer diameter of the bolt 22. When the ring-shaped alignment material 32e having such a shape is used, in addition to the function and effect of the above-described embodiment, the ring-shaped alignment material 32e covers the tip of the convex portion 30 of the concave-convex fitting portion. Therefore, it is not necessary to perform groove processing or the like on the concave / convex fitting portion, and an effect that the attachment can be easily performed is also obtained.
[0041]
【The invention's effect】
As described above in detail, according to the segment according to the present invention, it is possible to easily perform bolt fastening without reducing the clearance structurally.
[Brief description of the drawings]
FIG. 1 is an exploded cross-sectional explanatory view showing a basic structure example of a segment according to the present invention.
FIG. 2 is an enlarged cross-sectional view of a connected state of the segments of FIG.
FIG. 3 is an enlarged view of a main part of FIG. 1;
4 is a cross-sectional view of a ring-shaped alignment material used in the segment of FIG.
FIG. 5 is an enlarged cross-sectional view when the segments of FIG. 1 are connected in an aligned state.
6 is an enlarged cross-sectional view when the segments of FIG. 1 are connected in a misaligned state. FIG.
FIGS. 7A and 7B are a plan view and a perspective view of the alignment material used in the first embodiment of the segment according to the present invention. FIGS.
FIGS. 8A and 8B are a plan view and a perspective view of the alignment material used in the second embodiment of the segment according to the present invention. FIGS.
FIG. 9 is a plan view, a side view, a perspective view, and a side sectional view of an alignment material used in a third embodiment of the segment according to the present invention.
FIG. 10 is an explanatory cross-sectional view of a relevant part showing a fourth embodiment of a segment according to the present invention.
FIG. 11 is a plan view, a side view, a perspective view, and a side sectional view of an alignment material used in a fifth embodiment of the segment according to the present invention.
FIG. 12 is an explanatory sectional view showing an essential part of a sixth embodiment of a segment according to the present invention.

Claims (3)

By connecting with each other in the circumferential and axial directions, a plurality of segment pieces are assembled and installed in a ring shape along the tunnel excavation surface, and a concave and convex fitting portion for alignment is provided at the connecting joint portion between the segment pieces In the segment
A ring-shaped alignment material installed so as to protrude from either one of the opposing fitting surfaces of the concave-convex fitting portion;
The ring-shaped alignment material has a plurality of thin portions and thick portions provided on either one of the inner and outer peripheral surfaces,
The segment characterized by having arrange | positioned the said thin part and thick part alternately along the circumferential direction . By connecting with each other in the circumferential and axial directions, it is provided with a plurality of segment pieces assembled and installed in an annular shape along the tunnel excavation surface, and an uneven fitting portion for alignment is provided at the connecting joint portion between the segment pieces In the segment
A ring-shaped alignment material installed so as to protrude from either one of the opposing fitting surfaces of the concave-convex fitting portion;
The ring-shaped alignment material has a plurality of thin portions and thick portions provided on either one of the inner and outer peripheral surfaces,
The segment characterized by having arrange | positioned the said thin part and thick part alternately along the axial direction. The segment according to claim 1 or 2, wherein the ring-shaped alignment material is attached to a tip of a convex portion of the concave-convex fitting portion.

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