JP3842074B2 - Segment connection structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a connecting structure of segments that form a cylindrical wall body in the axial direction of a digging hole by connecting a plurality of them together.
[0002]
[Prior art]
As a method for constructing a tunnel, a so-called shield construction method is generally employed in which a concrete wall is assembled by assembling concrete segments on the inner surface side of an excavation hole.
As the segments used in this shield method, flat rectangular and arc-shaped ones are the mainstream, and these segments are joined together by bolts.
As a structure for joining segments with this bolt, joint plates having holes communicating with each other when the joint surfaces of the segments are brought into contact with each other in the vicinity of the joint surfaces of the segments are embedded. Generally, a structure is used in which a bolt is inserted into the hole portion and a nut is fastened and joined to the bolt. There is also a structure in which insert fittings which are nut members are embedded in the mutual segments, and bolts penetrating through the adjacent segments are fastened and joined together.
[0003]
However, in such a structure, the bolt is inserted into the hole formed in the joint surface of the joint at the construction site, and the nut is fastened to the bolt, or the bolt is fastened to the insert fitting embedded in the mutual segment. Therefore, there is a limit to shortening the assembly time because it requires extremely complicated work, and adaptation to automatic assembly by a robot is difficult. Furthermore, even when the secondary lining is omitted, the bolt box formed in the segment must be closed in order to install the bolts and nuts, and a new joint is aimed at speeding up construction and saving labor. The current situation is that there is an urgent need to develop the structure.
[0004]
Here, as a joining structure capable of joining the segments very easily, a C-type joining metal fitting is embedded at a position opposite to the joining surface of the segment, and both ends of the pair of the C-type joining equipment are engaged. A structure has been developed in which C-type joining metal fittings are joined together by I-type joining metal fittings and segments are joined to each other by joining joint surfaces by fitting I-type joining metal fittings. And, in such a segment connection structure, a taper surface is formed on the joint fitting and the joint fitting, and the pair of joint fittings are attracted to each other by pushing the joint fitting into the pair joint fitting. It is possible to increase the bonding force between the segments.
[0005]
[Problems to be solved by the invention]
However, in the conventional segment connecting structure including the above, since the segments are heavy when joining the segments, it takes a lot of labor and time to join the joining surfaces in an appropriate state. There was a problem.
[0006]
Therefore, the objective of this invention is providing the connection structure of the segment which can join easily joining surfaces in an appropriate state, when joining segments.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the segment connecting structure according to claim 1 of the present invention is a pair of engaging pieces whose end portions are bent inwardly on a joint surface on one side in the circumferential direction. A first joint fitting having a hook-shaped locking part is provided, and a pair of protrusions projecting in an opposite direction from an extension part extending from the joint surface to the opposite joint surface and from the distal end side of the extension part A plurality of segments each provided with a second joint fitting provided with an engaging portion having a portion, the one-side joining surface and the opposite-side joining surface abut each other, and between the locking portions A segment connecting structure for inserting and engaging the engaging portion of the second joint fitting with the locking piece portion of the first joint fitting by inserting the engagement portion inside; Both locking portions of the first joint fitting and the engaging portion of the second joint fitting are inserted at the time of engagement. In the first joint fitting, the inner surface of the bottom portion facing the locking piece portion extends in parallel with the axis of the segment, and the locking surface of the locking piece portion Is inclined so that the distance from the bottom becomes longer as it goes from one side to the opposite side in the length direction, and the second joint fitting is inserted along the inner surface of the bottom of the first joint fitting An outer peripheral surface of the protruding portion extending in parallel with the axis of the segment, and an engaging surface of the protruding portion engaged with a locking surface of the locking piece portion of the first joint fitting The insertion is guided while being inclined so that the distance from the joint surface on the reverse side is shortened from one side to the reverse side in the length direction, and the joint surface on the one side and the reverse side are guided. Also serves as an insertion guide for positioning the joint surface As well as, a bottom portion opposed to the engaging portion of the bottom portion and the second bonding metal facing the engaging piece of the first joint fitting, the axis of the segments extend parallel to the axis of the segment The cross-sectional shape orthogonal to each other has a semicircular outer peripheral surface, and the outer peripheral surface of each bottom portion is provided on the joint surface of the segment, and the cross-sectional shape orthogonal to the segment axis is a semicircular joint It is characterized by being fitted into the groove and detachable .
[0008]
As described above, both the locking portions of the first joint fitting and the engagement portions of the second joint fitting have a shape that is long in the insertion direction at the time of engagement. The inner surface of the bottom facing the portion extends parallel to the axis of the segment, and the distance from the bottom increases as the locking surface of the locking piece moves from one side to the opposite side in the length direction. In the second joint fitting, the outer peripheral surface of the protrusion inserted along the inner surface of the bottom of the first joint fitting extends in parallel to the axis of the segment, and The engaging surface of the protruding portion engaged with the locking surface of the locking piece portion is inclined so that the distance from the opposite joint surface becomes shorter as it goes from one side to the opposite side in the length direction. To guide the insertion and position the joint surface on one side and the joint surface on the opposite side In order to also serve as an insertion guide, when the engaging portion of the second joint fitting is inserted for engagement between the both locking portions of the first joint fitting, the joint surfaces of the segments are guided by these. It will be in an appropriate state. Therefore, when joining the segments, the joining surfaces can be easily joined in an appropriate state.
In addition, the bottom portion facing the locking piece portion of the first joint fitting and the bottom portion facing the engagement portion of the second joint fitting have a cross-sectional shape extending in parallel to the axis of the segment and orthogonal to the axis of the segment. Each has a semicircular outer peripheral surface, and the outer peripheral surface of each bottom portion is provided on the joint surface of the segment, and the cross-sectional shape perpendicular to the segment axis is fitted into the semicircular joint groove portion, Since each of them can be attached and detached, it is not necessary to embed these first joint fitting and second joint fitting when the segment is precast, and the segment can be easily precast.
[0009]
The segment connection structure according to a second aspect of the present invention relates to the segment connection structure according to the first aspect, wherein the first joint fitting and the second joint fitting are made of synthetic resin.
[0010]
As described above, since the first joint fitting and the second joint fitting are made of synthetic resin, the first joint fitting and the second joint fitting can be reduced in weight, and the segment can be reduced in weight.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a segment connecting structure of the present invention will be described with reference to FIGS.
[0014]
In FIG. 1, reference numeral 11 denotes a segment. This segment 11 is formed in a rectangular shape in a plan view and an arcuate plate shape in a side view. A plurality of segments 11 having the same shape are prepared, and adjacent ones of these segments 11 are connected to each other between the joining surfaces 12 and 13. By joining, the ring which comprises a cylindrical wall body in an excavation hole is constructed | assembled. And a cylindrical wall body is constructed | assembled by mutually joining this ring to the axial direction of a digging hole.
[0015]
As shown in FIGS. 2 and 3, the segment 11 includes a segment main body 15 formed of precast concrete in a rectangular shape in plan view and a circular arc shape in side view, and a joint surface on one side in the circumferential direction of the segment main body 15. 12 is composed of a joining fitting (first joining fitting) 17 attached to 12 and a joining fitting (second joining fitting) 18 attached to the opposite joining surface 13 (in FIGS. 1 to 3). Shows a joint surface 12 on one side of one segment 11 and a joint surface 13 on the opposite side of the other segment 11).
[0016]
The joint surface 12 on one side of the segment body 15 and the joint surface 13 on the opposite side are formed with a joint groove 20 extending in parallel to the axis of the segment 11 and having a semicircular cross section perpendicular to the circumferential direction. Has been. Here, the joining groove portion 20 of the joining surface 12 on one side has a shape in which one side in the axial direction of the segment 11 penetrates the end portion, and the opposite side has a shape that does not penetrate the end portion. Further, the joining groove portion 20 of the joining surface 13 on the opposite side has a shape that the same side as the opposite side in the axial direction of the segment 11 penetrates the end portion, whereas the opposite side has a shape that does not penetrate the end portion. There is no. A plurality of insert nuts 21 are embedded in the bottom portions 22 of the joining groove portions 20 at right angles to the bottom portion 22 during precasting.
[0017]
Here, since the joint surface 12 on one side and the joint surface 13 on the opposite side penetrate in the reverse direction as described above, the segment body 15 is the same even if the one side and the opposite side are reversed. It has a shape that becomes.
[0018]
Then, a female joint fitting 17 is provided on the joint surface 12 on one side of the segment body 15, and a male joint fitting 18 having the same length as the joint fitting 17 is provided on the opposite joint surface 13. Yes.
[0019]
As shown in FIG. 4, the female joint fitting 17 has a cross-sectional shape orthogonal to the length direction as a whole and has a C-shape as a whole and a semicircular outer portion, and protrudes inward at the end. A pair of locking portions 24 formed in an arcuate shape having a locking piece portion 23 that makes the locking piece portion 23 face each other and connect the base portions 25 opposite to the locking piece portion 23 to each other Thus, the bottom 26 is formed. The metal fitting 17 can be made of metal, but here it is made of synthetic resin in order to reduce the weight.
[0020]
The thickness on the bottom portion 26 side of the joint fitting 17 is constant, and the engagement surface 28 on the side facing the bottom portions 26 of the both engagement piece portions 23 of the joint fitting 17 is opposite from the one side in the length direction. The opposing surfaces 29 of the two locking pieces 23 face each other as they go from the same side to the opposite side in the length direction. Inclined so that the distance increases. Here, the reverse side is referred to as an insertion inlet side.
[0021]
The bottom portion 26 is formed with a plurality of through holes 30 with counterbore. Except for the through-hole 30, the joining bracket 17 has a C-shaped cross section perpendicular to the length direction over the entire range in the length direction.
[0022]
A plurality of such fittings 17 are inserted through the through holes 30 and screwed into the insert nuts 21 while being fitted in the semicircular joining groove 20 of the joining surface 12 on one side of the segment body 15. The bolt member 32 is fixed to the segment body 15. That is, the joint fitting 17 is detachable from the segment body 15. Here, the joint fitting 17 is disposed at the center position in the axial direction of the segment main body 15 in the attached state, and the end surface 33 opposite to the bottom portion 26 of the locking piece portion 23 is flush with the joint surface 12. It has come to make.
[0023]
As shown in FIG. 4, the male joint fitting 18 includes a mounting fitting portion 35 having a semicircular cross section perpendicular to the length direction, and a flat surface 36 of the mounting fitting portion 35. The cross-sectional shape orthogonal to the vertical direction has an engaging portion 37 that protrudes in a substantially T-shape.
[0024]
That is, the engaging portion 37 includes a plate-like extending portion 39 that protrudes perpendicularly to the flat surface 36 from the center portion of the flat surface 36 of the mounting fitting portion 35, and the distal end side of the extending portion 39. A pair of projecting portions 40 projecting in opposite directions so as to be orthogonal to the extending portions 39 are provided. Here, the outer peripheral surface on the opposite side with respect to the mounting fitting portion 35 of both the protruding portions 40 and the extending portion 39 is a substantially continuous cylindrical surface. The joint fitting 18 can be made of metal, but here it is made of synthetic resin in order to reduce the weight.
[0025]
The thickness of the attachment fitting portion 35 of the joint fitting 18 is constant, and the engagement surface 42 on the side facing the attachment fitting portion 35 of both protrusions 40 is from one side to the opposite side in the length direction. Inclined so that the distance from the mounting fitting portion 35 is shortened as it goes, and the opposing reciprocal surfaces 43 of the extending portion 39 are distances from each other toward the opposite side from the same side in the length direction. Is tilted away. Here, the one side is referred to as an insertion tip side.
[0026]
The joint fitting 18 is formed with a plurality of counterbore through holes 44 penetrating the extending portion 39 and the attachment fitting portion 35.
[0027]
A plurality of such fittings 18 are inserted into the through holes 44 and screwed into the insert nuts 21 while being fitted in the semicircular joining groove 20 of the joining surface 13 on the opposite side of the segment body 15. The bolt member 32 is fixed to the segment body 15. That is, the joining metal fitting 18 is detachable from the segment body 15. Here, the joining metal fitting 18 is disposed at the center position in the axial direction of the segment main body 15 and the flat surface 36 of the attachment fitting portion 35 is flush with the joining surface 13 in this attached state. Thus, the engaging portion 37 having an extending portion 39 extending from the joint surface 13 and a pair of protruding portions 40 protruding in the opposite direction from the distal end side of the extending portion 39 is provided.
[0028]
Then, when the engagement portion 37 of the joint fitting 18 is inserted into the engagement space 46 between the both latch portions 24 of the joint fitting 17 from the insertion inlet side, and the insertion tip side is inserted at the head, The engaging portion 37 enters the engaging space 46 while the insertion is guided. Then, in a state in which the joining bracket 17 and the joining bracket 18 are aligned in the length direction, the reciprocal surfaces 43 come into full contact with the opposing surfaces 29, and the engaging surfaces 42 are engaged with the locking surfaces 28. The joint metal fitting 17 and the joint metal fitting 18 are connected without rattling. In this state, the bonding surface 12 and the bonding surface 13 are positioned.
[0029]
Next, a procedure for connecting the segments 11 to each other will be described. In the following explanation, in the axial direction of the excavation hole, the side where the shield machine for excavating the ground is referred to as the face side, and the opposite side, that is, the side where the excavation hole is located is the pit side Called.
[0030]
Here, one segment 11 (11A) is installed on the face side of the existing ring 48 that is already constructed in a ring shape with the segment 11 in the excavation hole, and the other side is connected to the joint surface 12 on one side of the segment 11 (11A) The case where the joining surface 13 on the opposite side of the segment 11 (11B) is joined in the circumferential direction will be described. Note that a female joint fitting 17 is attached to the joint surface 12 on one side of the segment 11 (11A) with its insertion inlet side facing the face, and the reverse side of the segment 11 (11B). A male joint 18 is attached to the joint surface 13 with the insertion tip side facing the wellhead.
[0031]
As shown in FIG. 5, the position of the other segment 11 (11B) in the axial direction relative to the one segment 11 (11A) is smaller than the joining bracket 17 of the joining groove 20 of the one segment 11 (11A). The engagement portion 37 of the joining metal fitting 18 of the other segment 11 (11B) is aligned with the side portion.
[0032]
In this state, as shown in FIG. 6, while inserting the engaging portion 37 of the joining bracket 18 of the other segment 11 (11B) into the joining groove portion 20 of the one segment 11 (11A), the one segment 11 (11A) ) And the joining surface 13 of the other segment 11 (11B) are brought into contact with each other.
[0033]
Next, in this state, as shown in FIG. 7, the segment 11 (11 </ b> B) is moved to the wellhead side until it abuts on the existing ring 48.
[0034]
Then, the joining fitting 18 of the segment 11 (11B) moves integrally with the segment 11 (11B), and the engaging portion 37 of the joining fitting 18 moves from the insertion tip side of the joining fitting 17 of the segment 11 (11A). It enters the insertion entrance side of the engagement space 46 and enters the engagement space 46 while being guided by both the locking portions 24. When the segment 11 (11B) comes into contact with the existing ring 48, the joining metal member 17 and the joining metal member 18 are aligned in the length direction, and as shown in FIG. Both the surfaces 29 and the engaging surfaces 42 are in full contact with the locking surfaces 28, so that the joint 17 and the joint 18 are connected without a gap. . Further, in this state, as shown in FIG. 1, the joining surface 12 and the joining surface 12 are entirely overlapped and joined in a state of being positioned with respect to each other.
[0035]
That is, both the locking portions 24 of the joint fitting 17 and the engagement portion 37 of the joint fitting 18 have a long shape in the insertion direction at the time of engagement. Is inserted in the positioning state so that the joining surface 12 and the joining surface 13 are entirely overlapped, so that not only the segments 11 are joined but also the engaging portions between the locking portions 24. It also serves as an insertion guide for guiding the insertion of 37 and positioning and joining so that the joining surface 12 and the joining surface 13 are entirely overlapped.
[0036]
According to the above embodiment, the both locking portions 24 of the joint fitting 17 and the engagement portion 37 of the joint fitting 18 have a long shape in the insertion direction at the time of engagement, and the joining surface 12 and the joining surface 13 are formed. In order to also serve as an insertion guide for positioning, when the engaging portion 37 of the joining metal fitting 18 is inserted between both the locking portions 24 of the joining metal fitting 17 for engagement, they are guided by these, and the joining surfaces 12, 13 is in a proper state, that is, a positioning state in which it is entirely overlapped. Therefore, when the segments 11 are joined together, the joining surfaces 12 and 13 can be easily joined in an appropriate state, that is, in a positioning state where they are entirely overlapped.
[0037]
In addition, since the joint fitting 17 and the joint fitting 18 are made of synthetic resin, the joint fitting 17 and the joint fitting 18 can be reduced in weight, and the weight of the segment 11 can be reduced.
[0038]
Furthermore, since the joining bracket 17 and the joining bracket 18 can be attached to and detached from the segment 11, it is not necessary to embed the joining bracket 17 and the joining bracket 18 when the segment body 15 is precast, and the segment body 15 can be easily precast. Can be done.
[0039]
【The invention's effect】
As described above, according to the segment connecting structure according to the first aspect of the present invention, the both locking portions of the first joining fitting and the engaging portion of the second joining fitting are inserted at the time of engagement. In the first joint fitting, the inner surface of the bottom portion facing the locking piece portion extends in parallel with the axis of the segment, and the locking surface of the locking piece portion has a length. In the second joint fitting, the outer peripheral surface of the protrusion inserted along the inner surface of the bottom part of the first joint fitting is inclined so that the distance from the bottom portion becomes longer as it goes from one side to the opposite side in the direction. Is extended in parallel with the axis of the segment, and the engaging surface of the protruding portion engaged with the engaging surface of the engaging piece portion of the first joint fitting is directed from one side to the opposite side in the length direction. By inclining so that the distance from the opposite joint surface becomes shorter according to While also used the insertion guide for positioning the joint surface of the joint surface of one side and the opposite side as to guide the insertion, engagement of the bottom and the second bonding metal to face the engaging piece of the first joint device The bottom part facing the part has a semicircular outer peripheral surface extending in parallel to the axis of the segment and perpendicular to the axis of the segment, each having the same diameter. Since the cross-sectional shape perpendicular to the segment axis provided on each surface is fitted in the semicircular joining groove portion and is detachable , the second portion is provided between both locking portions of the first joining fitting. When the engaging portions of the joining metal fittings are inserted for engagement, they are guided by these so that the joining surfaces of the segments are in an appropriate state. Therefore, when joining segments, joining surfaces can be joined in an appropriate state.
[0040]
According to the segment connecting structure according to claim 2 of the present invention, since the first joining fitting and the second joining fitting are made of synthetic resin, the first joining fitting and the second joining fitting are reduced in weight. And the weight of the segment can be reduced.
[Brief description of the drawings]
FIG. 1 is a perspective view of one connecting point between segments connected by a segment connecting structure according to an embodiment of the present invention.
FIG. 2 is an exploded perspective view showing a state before connection of a segment connection structure according to an embodiment of the present invention.
FIG. 3 is a perspective view showing a state before connection of a segment connection structure according to an embodiment of the present invention.
FIG. 4 is a front cross-sectional view before connection showing one side of the segment connection structure of the embodiment of the present invention.
FIG. 5 is a plan sectional view showing a state immediately before connection of a segment connection structure according to an embodiment of the present invention.
FIG. 6 is a cross-sectional plan view showing a state during connection of the segment connection structure of one embodiment of the present invention.
FIG. 7 is a plan sectional view showing a state after the connection of the segment connection structure according to the embodiment of the present invention.
FIG. 8 is a front sectional view showing a state after the connection of the segment connection structure of one embodiment of the present invention.
[Explanation of symbols]
11 Segment 12 Joint surface (joint surface on one side)
13 Bonding surface (reverse bonding surface)
17 Bonding bracket (first bonding bracket)
18 Bonding bracket (second bonding bracket)
23 Locking piece part 24 Locking part 39 Extension part 40 Engagement part

Claims (2)

A first joint fitting having a pair of hook-shaped latching portions each having an end bent inward on a joint surface on one side in the circumferential direction is provided, and the joint surface on the opposite side A segment provided with a second joint fitting provided with an engaging portion having an extending portion extending from the joining surface and a pair of projecting portions projecting in opposite directions from the distal end side of the extending portion. A plurality of the one-side joint surface and the opposite-side joint surface are abutted with each other, and the engagement portion is inserted inside the engagement portions to thereby lock the first joint fitting. A segment connecting structure that engages and connects the engaging portion of the second joint fitting to one piece,
Both locking portions of the first joint fitting and the engagement portion of the second joint fitting have a long shape in the insertion direction at the time of engagement,
In the first joint fitting, the inner surface of the bottom portion facing the locking piece portion extends in parallel with the axis of the segment, and the locking surface of the locking piece portion is on one side in the length direction. It is inclined so that the distance from the bottom becomes longer as it goes to the opposite side from
In the second joint fitting, an outer peripheral surface of the protruding portion inserted along the inner surface of the bottom portion of the first joint fitting extends parallel to the axis of the segment, and the first joint fitting The distance from the joint surface on the opposite side becomes shorter as the engagement surface of the protrusion engaged with the engagement surface of the engagement piece portion moves from one side to the opposite side in the length direction. By being inclined,
While also serving as an insertion guide for guiding the insertion and positioning the joint surface on one side and the joint surface on the opposite side ,
A cross section in which a bottom portion facing the locking piece portion of the first joint fitting and a bottom portion facing the engagement portion of the second joint fitting extend parallel to the axis of the segment and are orthogonal to the axis of the segment Each of the shapes has a semicircular outer peripheral surface, and the outer peripheral surface of each bottom portion is provided in the joint surface of the segment, and the cross-sectional shape perpendicular to the segment axis is fitted in the semicircular joint groove In addition , a segment connecting structure characterized by being detachable .   The segment connection structure according to claim 1, wherein the first joint fitting and the second joint fitting are made of synthetic resin.

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