JP4311812B2 - Segment fitting - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of a segment joint for joining segments for tunnel lining.
[0002]
[Prior art]
In tunnel lining, a plurality of segments having an arc-shaped cross section are joined along the inner circumferential direction of the tunnel via a segment joint to form a segment ring. Then, by connecting this segment ring in the tunnel axial direction along with the excavation of the shield machine, the entire tunnel is covered.
[0003]
The connection of the segments by such a segment joint needs to be strengthened so as to be able to resist the bending moment caused by the strong soil hydraulic load acting on the tunnel. Therefore, conventionally, for example, a segment joint as shown in FIGS. 15 and 16 has been used.
[0004]
As shown in the figure, this conventional segment joint is composed of joint plates 103A and 103B, a bolt 106 and a nut 107 for connecting them.
[0005]
Joint plates 103A and 103B are embedded and fixed together with anchor bars 104 on joint surfaces 102A and 102B of the segments 101A and 101B to be connected. Then, the bolts 106 inserted into the bolt insertion holes 105A and 105B formed in the joint plates 103A and 103B are tightened with nuts 107, thereby connecting the segments 101A and 101B via the joint plates 103A and 103B. . In this case, the position of the segment joint (connection position by the bolt 106) is set to a position 1 / 3h to 1 / 2h (where h is the segment thickness) from the segment inner peripheral surface (the inner surface of the segment ring). Further, for the tightening operation of the bolt 106, openings 108A and 108B are opened on the inner peripheral surface of the segment.
[0006]
[Problems to be solved by the invention]
However, in such a conventional segment joint, a detailed and complicated positioning operation is required to mount the bolt, and a long operation time is required for fastening.
[0007]
Moreover, there exists a problem that the intensity | strength of segment 101A, 101B will be weakened by presence of opening part 108A, 108B formed in the internal peripheral surface of a segment. Furthermore, when the secondary lining of the tunnel is omitted, there is a risk that corrosion will occur in the component parts (bolts 106 and nuts 107) of the segment joint exposed to the atmosphere in the openings 108A and 108B.
[0008]
Further, since the segment joint is disposed on the inner peripheral surface side of the segments 101A and 101B, the segment ring has sufficient strength for the positive direction bending moment, but has sufficient strength for the negative direction bending moment. I can't say that.
[0009]
The present invention has been made paying attention to such problems, and an object of the present invention is to provide a segment joint that can be fastened by a simple operation in a short time and has sufficient strength against bending moments in both positive and negative directions. And
[0010]
[Means for Solving the Problems]
In the first aspect of the present invention, in the segment joint for joining the segments for tunnel lining work, the concave portions formed at both ends in the tunnel axial direction of the joint surfaces of the segments and the bottom surfaces in the tunnel axial direction of these concave portions are respectively fixed. A joint member having a wedge-shaped projection, a pair of wedge portions sandwiching a pair of wedge-shaped projections of the segment to be connected from both sides, and a pair of joint members respectively disposed in the concave portions on both sides of the segment. Thus, there are provided pulling means for pushing the joint members into the wedge-shaped protrusions to engage the wedge-shaped protrusions and the wedge portions, and guide means for guiding the two segments to be connected to each other in the tunnel axis direction.
[0011]
Also The joint member includes a pair of upper and lower tension members that join the upper and lower ends of the pair of wedge portions, and the positions of the upper and lower tension members in the tunnel radial direction are the positions of the outer peripheral surface side main reinforcing bars and the inner peripheral surface of the segment, respectively. The position of the side main reinforcing bar was set to be approximately the same.
[0012]
First 2 According to the invention, in the segment joint for joining the segments for tunnel lining work, the concave portions formed at both ends of the joint surface of the segment in the tunnel axial direction, and the wedge-like shapes fixed to the bottom surfaces of the concave portions in the tunnel axial direction, respectively. A projection, a pair of cylindrical members sandwiching a pair of wedge-shaped projections facing the segments to be coupled from both sides, a joint member having a pair of pulling members that join both ends of these cylindrical members, and recesses on both sides of the segments By pulling the pair of joint members arranged together, the joint members are pushed toward the wedge-shaped projections to engage the wedge-shaped projections between the cylindrical members, and the two segments to be connected are connected to each other by a tunnel axis. And guide means for guiding in the direction.
[0013]
First 3 In the invention, the centroid of the pulling member is decentered in a direction in which the joint member is pushed in relative to a position where the pair of columnar members are fixed to the pulling member.
[0016]
First 4 In this invention, the guide means includes a guide member that is attached to the other joint surface and extends in the tunnel axis direction at a substantially center of one joint surface of the segments to be connected and has a half of the cross section embedded therein. The guide member includes a groove formed so that a non-embedded portion of the guide member is fitted.
[0017]
First 5 In the invention, the guide means includes a guide pipe attached in a state where the half of the cross section is embedded in the center of one joint surface of the segment to be connected, extending in the tunnel axis direction, and the other joint surface. The guide member includes a groove formed so that a non-embedded portion of the guide member is fitted, and at least a part of the drawing means is provided in the guide tube.
[0018]
First 6 In this invention, the drawing means includes a bolt inserted through the guide member, and fixes one of the joint members on both sides in the tunnel axial direction of the segment to one end of the bolt, and connects the other end of the bolt to the joint member. The joint members on both sides of the segment are pulled toward each other by screwing a nut attached to the other end of the bolt through a bolt insertion hole formed on the other side.
[0019]
First 7 In the invention, the concave portion is opened on the outer peripheral surface of the segment.
[0020]
First 8 In this invention, the concave portion is not opened on the inner peripheral surface of the segment.
[0021]
Operation and effect of the invention
In the first invention, when the joint member is installed so that the wedge-shaped projection in the segment recess is sandwiched by the wedge portion, and the pair of joint members on both sides (front and rear) of the segment are pulled together by the pulling means, The wedge-shaped projections engage with each other, and the segments are firmly connected through the joint member and the wedge-shaped projections by the action of the wedge. Therefore, the connecting operation of the segments by the segment joint can be easily performed in a short time by a simple operation.
[0022]
Also A tensile force acts between the segments by the pair of upper and lower tension members constituting the joint member, and the upper and lower tension members are equal to the inner peripheral surface side main reinforcing bar and the outer peripheral surface side main reinforcing bar of the segment, respectively, in the tunnel radial direction. Since it is disposed at a position, it has a sufficient strength with respect to bending moments in both positive and negative directions with respect to the segment ring.
[0023]
First 2 In this invention, when the joint member is installed so that the wedge-shaped projections in the segment recesses are sandwiched between the cylindrical members, and the pair of joint members on both sides (front and rear) of the segment are pulled toward each other by the pulling means, The wedge-shaped projections engage with each other, and the segments are firmly connected to each other through the joint member and the wedge-shaped projections by the action of the wedge. Therefore, the connecting operation of the segments by the segment joint can be easily performed in a short time by a simple operation. Further, a pair of cylindrical members can obtain a wedge action with a wedge-shaped projection as long as the distance between the cylindrical members is appropriately set. For example, when a wedge portion having an inclined surface is used instead of the cylindrical member, As described above, high processing accuracy is not required. Therefore, manufacture of a coupling member can be performed easily and cost reduction can be aimed at.
[0024]
First 3 In this invention, when the joint member is pushed toward the wedge-shaped protrusion by the pulling means, a bending moment due to a reaction force that the wedge-shaped protrusion tries to push back the columnar member acts on the pulling member, while the centroid of the pulling member is The eccentric bending moment due to the horizontal force in which the wedge-shaped projections try to push the cylindrical member open by acting eccentrically in the direction in which the joint member is pushed in from the fixed position of the cylindrical member (that is, the point of action of the force on the pulling member) To do. These bending moments are opposite to each other and cancel each other. Therefore, the bending moment generated in the tension member can be made small, and the thickness for securing the strength of the tension member can be made small. Therefore, the joint member can be reduced in size and weight, and the cost can be reduced by reducing the material cost.
[0027]
First 4 In the present invention, when assembling the segment to be connected to the existing segment, the assembled segment is slid in the direction along the guide member and the groove, so that the guide member and the groove are a guide for the slide when the segment is assembled Acts as Therefore, the assembly of the segments can be performed very easily and accurately in a short time. The guide member functions as a resistance member against the shearing force acting on the segment.
[0028]
First 5 In this invention, since at least a part of the pulling means is accommodated in the guide tube, the pulling means can be rationally arranged, and the segment joint can be configured compactly.
[0029]
First 6 In this invention, since the pulling means is composed of a bolt and a nut, it can be constructed at a low cost, and the fastening force of the segment joint can be easily managed by adjusting the tightening torque of the nut.
[0030]
First 7 In this invention, when concrete is filled in the outer periphery of the segment ring after fastening by the segment joint, the concave portion opened in the outer peripheral surface of the segment is automatically filled with concrete, and the components of the segment joint in the concave portion are covered with concrete. Therefore, corrosion of these components can be prevented without special treatment.
[0031]
First 8 In this invention, since the concave portion of the segment does not open to the inner peripheral surface of the segment, even when the secondary lining is omitted, the component parts of the segment joint in the concave portion are hardly corroded.
[0032]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0033]
FIG. 1 is a perspective view showing a segment joint according to a first embodiment of the present invention.
[0034]
The segments 1A and 1B constitute a part of the segment ring, and are arranged along the inner circumferential direction of the tunnel so that the joint surfaces 2A and 2B of the respective ends face each other. Established. Although not shown, there are also joint surfaces on the opposite ends of the segments 1A and 1B, which are joined to adjacent segments.
[0035]
Concave portions 3A, 4A and 3B, 4B (4B is not shown) are cut out at both ends in the tunnel axis direction of joint surfaces 2A and 2B (however, for concave portion 4B, see FIGS. 4 to 6). Wedge-like projections 5A, 6A and 5B, 6B extending in the tunnel axis direction are disposed at substantially the center of the bottom surfaces in the tunnel axis direction of these recesses 3A, 4A and 3B, 4B (however, with respect to the wedge-like projections 6A, 6B) 4 to 6).
[0036]
The recesses 3A, 4A and 3B, 4B should not be opened on the inner peripheral surface side of the segments 1A, 1B. Thereby, even when the secondary lining is omitted, the component parts (for example, bolts 33 to be described later) of the segment joints inside the recesses 3A, 4A and 3B, 4B can be hardly corroded.
[0037]
Moreover, although not shown in figure, you may form recessed part 3A, 4A and 3B, 4B so that it may open to the outer peripheral surface side of segment 1A, 1B. Thus, as will be described later, when the outer periphery of the segment ring is filled with concrete, the recesses 3A, 4A and 3B, 4B are filled with concrete, and the segment joints are automatically protected from corrosion.
[0038]
A guide pipe 7 extending in the tunnel axis direction is attached to the joint surface 2A of the segment 1A in a state in which approximately half of the circular cross section is embedded at the approximate center in the tunnel radial direction. A concave groove 8 is formed in the joint surface 2B of the segment 1B so that when the joint surfaces 2A and 2B are joined, the non-embedded portion of the guide tube 7 is fitted. In the present embodiment, the guide tube 7 and the concave groove 8 constitute guide means.
[0039]
Further, on the side surfaces of the segments 1A and 1B (joint surfaces 2A and 2B, the joint surfaces on the opposite side and the joint surfaces with the front and rear segment rings), seal grooves 9A, 10A and 9B for a water-stop seal are provided on the entire circumference. 10B is formed. A sealing material is fitted into these sealing grooves 9A, 10A and 9B, 10B. The seal grooves 9A and 9B are located close to the outer peripheral surfaces (the surfaces on the tunnel inner peripheral surface side) of the segments 1A and 1B, and the seal grooves 10A and 10B are located close to the inner peripheral surfaces of the segments 1A and 1B. , Respectively.
[0040]
The joint member 11 is a member that fits into the wedge-shaped projections 5A and 5B in the recesses 3A and 3B when the segments 1A and 1B are connected, and includes a joint member body 12 having a U-shaped cross section. Further, the joint member 21 is a member that fits into the wedge-shaped projections 6A and 6B in the recesses 4A and 4B when the segments 1A and 1B are connected, and similarly to the joint member 11, the joint member body 22 having a U-shaped cross section is provided. Prepare. The left and right bent portions of these joint member bodies 12 and 22 are wedge portions 13A, 13B and 23A, 23B, respectively.
[0041]
A pair of upper and lower tension members 14 and 15 and a pair of upper and lower tension members 24 and 25 are provided at both upper and lower ends of the joint members 11 and 21, respectively. The left and right ends of the tension members 14, 15 and 24, 25 are fixed to the upper and lower ends of the pair of left and right wedge portions 13A, 13B and 23A, 23B, respectively.
[0042]
In addition, bolt insertion holes 16 and 26 are opened at substantially the center of the joint member main bodies 12 and 22.
[0043]
2 and 3 are cross-sectional views showing a fastening state by the joint member 11. 2 and 3 show the fastening state on the joint member 11 side for convenience, but in the following description, the joint member 11 side and the joint member 21 side will be described in parallel.
[0044]
As shown in the figure, the opposed inner surfaces of the wedge portions 13A and 13B and the wedge portions 23A and 23B and the surfaces facing the outside of the wedge-shaped projections 5A and 5B and the wedge-shaped projections 6A and 6B are respectively wedge-shaped inclined surfaces (wedge surfaces). ). When the segments 1A and 1B are fastened by the joint member 11 and the joint member 21, the wedge portions 13A and 13B and the wedge portions 23A and 23B sandwich the wedge-shaped projections 5A and 5B and the wedge-shaped projections 6A and 6B from both sides, and the wedge portion 13A. 13B and the wedge surfaces of the wedge portions 23A and 23B are brought into contact with the wedge surfaces of the wedge-shaped projections 5A and 5B and the wedge-shaped projections 6A and 6B, and when the joint member 11 and the joint member 21 are pushed into the segments 1A and 1B, The wedge surface engages deeper.
[0045]
When the wedge surfaces engage with each other in this way, a pulling force in the direction of pulling each other acts between the opposing wedge portions 13A, 13B and the wedge portions 23A, 23B by the pull members 14, 15 and the pull members 24, 25. . Due to the wedge action, the segments 1A and 1B are strongly connected.
[0046]
Further, the predetermined positions in the tunnel radial direction of the segments 1A and 1B are a plurality of outer peripheral surface side main reinforcing bars 31A, inner peripheral surface side main reinforcing bars 32A, outer peripheral surface side main reinforcing bars 31B, and inner peripheral surface side main reinforcing bars 32B, respectively. Are arranged side by side along the inner circumferential direction of the tunnel. Here, the outer peripheral surface side main reinforcing bar 31A and the outer peripheral surface side main reinforcing bar 31 are subjected to a bending moment on the outer peripheral surface side of the segments 1A, 1B, and the inner peripheral surface side main reinforcing bar 32A and the inner peripheral surface side main reinforcing bar. 32B receives a bending moment on the inner peripheral surface side of the segments 1A and 1B.
[0047]
The tension members 14 and 24 are disposed at substantially the same height in the tunnel radial direction as the outer peripheral surface side main reinforcing bar 31A and the outer peripheral surface side main reinforcing bar 31B (in other words, substantially in the vertical direction in FIG. 3). Are arranged at the same height). The tension members 15 and 25 are disposed at substantially the same height in the tunnel radial direction as the inner peripheral surface side main reinforcing bar 32A and the inner peripheral surface side main reinforcing bar 32B, respectively. Therefore, the tension members 14, 15 and 24, 25, which are members that receive the bending moment acting on the segments 1A, 1B in the segment joint, are disposed on both the inner and outer peripheral sides of the segments 1A, 1B. It has a sufficiently high strength with respect to bending moments in both positive and negative directions.
[0048]
Bolts 33 are inserted into the guide tube 7, and both ends of the bolt 33 protrude from the guide tube 7. The ends of the bolts 33 on the concave portions 4A, 4B side are fixed to the bolt insertion holes 26 of the joint member 21 by, for example, welding. On the other hand, the end portions of the bolts 33 on the recesses 3 </ b> A and 3 </ b> B side are inserted into the bolt insertion holes 16 of the joint member 11 and tightened by the nuts 34. By tightening the nut 34, the joint members 11, 21 are pulled toward each other and are pushed into the segments 1A, 1B as a result. As a result, the segments 1A and 1B are firmly connected by the action of the wedge described above.
[0049]
As described above, the segment joint of the present embodiment includes the wedge-shaped projections 5A, 6A and 5B, 6B, the joint members 11 and 21, and the bolt 33 and the nut 34 that are the pulling means for the joint members 11 and 21.
[0050]
Next, the fastening procedure for the segment joint of the present invention will be described with reference to FIGS.
[0051]
First, as shown in FIG. 4, the segment ring 1 </ b> A is assembled in front of the existing segment ring 40, that is, on the traveling direction side of the tunnel lining (lower side in FIG. 4). In this case, a bolt 33 having the joint member 21 fixed to the end portion is inserted in the guide tube 7 in advance, and the joint member 21 is disposed on the concave portions 4A and 4B side.
[0052]
Subsequently, the segment 1B is assembled next to the segment 1A by sliding the joint surface 2B along the joint surface 2A of the segment 1A from the position shifted forward in the tunnel axis direction toward the existing segment ring 40. . In this slide, the guide tube 7 embedded in the joint surface 2A is fitted into the concave groove 8 of the joint surface 2B from the end portion by the amount of the slide. Accordingly, the guide tube 7 and the concave groove 8 act as a guide for the slide when the segment 1B is assembled, the segment 1B is automatically assembled at the correct position, and the segment can be assembled very easily.
[0053]
When the assembly of the segments 1A and 1B is completed, the end portions on the concave portions 3A and 3B side of the bolts 33 are inserted into the bolt insertion holes 16 of the joint member 11 as shown in FIG. Then, as shown in FIG. 6, the nut 34 provided at the end of the bolt 33 is tightened. By this tightening, the joint members 11 and 21 are attracted to each other via the bolts 33, the joint member 11 is strongly engaged with the wedge-shaped protrusions 5A and 5B, and the joint member 212 is strongly engaged with the wedge-shaped protrusions 6A and 6B. The segments 1A and 1B are firmly connected by the action of the wedge by this meshing.
[0054]
At this time, the water stop seal member mounted between the joint surfaces 2A and 2B is deformed so as to be accommodated in the seal grooves 9A, 10A and 9B and 10B, and the mesh opening is eliminated.
[0055]
In this way, the segments 1A and 1B can be connected very easily by pulling the joint members 11 and 21 together and engaging them with the wedge-shaped projections 5A, 5B and 6A, 6B.
[0056]
And the fastening by this segment joint is with respect to the bending moment of the positive / negative direction with respect to a segment ring by the tension members 14, 15 and 24, 25 arrange | positioned at both the inner peripheral surface side and outer peripheral surface side of segment 1A, 1B. It will have sufficient strength.
[0057]
Further, in this case, by adjusting the tightening torque of the nut 34, the degree of pushing of the joint members 11 and 21 can be adjusted, and the fastening force of the segment joint can be easily managed.
[0058]
Further, the guide tube 7 functions as a resistance member against the shearing force acting on the segments 1A and 1B.
[0059]
Also, if the recesses 3A, 4A and 3B, 4B are opened to the outer peripheral surface side of the segments 1A and 1B, concrete is placed on the outer peripheral surface side of the segments 1A and 1B in the subsequent tunnel lining work ( For example, refer to Patent No. 1828100 and Patent No. 1829591), and concrete is automatically filled in the recesses 3A, 4A and 3B, 4B. Thereby, the segment joint is automatically covered with concrete, and corrosion of the bolt 33, the nut 34, and the like constituting the segment joint can be prevented without taking any special measures.
[0060]
Further, since the recesses 3A, 4A and 3B, 4B are not open on the inner peripheral surface side of the segments 1A, 1B, even if the secondary lining is omitted, the bolts in the recesses 3A, 4A, 3B, 4B 33, the nut 34, etc. are hardly corroded.
[0061]
Further, since the recesses 3A, 4A and 3B, 4B are formed at both ends of the segment joint surfaces 2A, 2B in the tunnel axis direction, the strength of the segment is weakened as in the case where openings are formed on the inner peripheral surface of the segment. There is no end.
[0062]
In the above embodiment, the wedge-shaped protrusions 5A, 6A and 5B, 6B extending in the tunnel axis direction are used as the wedge-shaped protrusions that engage with the joint members 11, 21, but the wedge-shaped protrusion of the present invention has such a form. The shape, the number, the arrangement, etc. of the wedge-shaped projections can be freely selected as long as the joint members 11 and 21 are wedge-coupled.
[0063]
For example, as shown in FIGS. 7 and 8, a pair of wedge-shaped projections 65A, 66A and 65B, 66B extending in the circumferential direction of the tunnel (direction parallel to the tension members 14, 15) are respectively provided in the recesses 3A and 3B. And the wedge-shaped slopes (wedge surfaces) formed at the other ends of the wedge-shaped projections 65A and 66A and the wedge-shaped projections 65B and 66B are respectively wedged portions of the joint member 11. You may make it wedge-join with 13A, 13B. In this way, if the wedge-shaped projections 65A, 66A and 65B, 66B are provided in parallel with the tension members 14, 15, the wedge-shaped projections 65A, 66A and 65B, 66B will not be subjected to torsion or the like due to bending tension, and reliably. Can resist bending moments. Further, since the wedge-shaped projections 65A and 65B and the wedge-shaped projections 66A and 66B are in surface contact with each other, the strength is enhanced by supporting each other.
[0064]
9 to 11 show a segment joint according to a second embodiment of the present invention.
[0065]
The segment joint of this embodiment is only in that the form of the joint member is changed as compared with the segment joint of the first embodiment (a form in which wedge-shaped protrusions 65A, 66A and 65B, 66B are adopted). Unlike other configurations, they are common. In addition, although the following description demonstrates the joint member 71 of this Embodiment corresponding to the joint member 11 of 1st Embodiment, it is a joint member also corresponding to the joint member 21 of 1st Embodiment. A joint member having the same (symmetric) form as 71 is provided.
[0066]
As shown in the figure, the joint member 71 includes a pair of upper and lower tension members 74 and 75, and these tension members 74 and 75 are connected by a pair of left and right columnar members 73 A and 73 B and a bottom plate 72. It is.
[0067]
More specifically, the tension members 74 and 75 are a pair of pentagonal plate-like members arranged in parallel with the inner side surfaces facing each other, and the upper end and the lower end of the columnar member 73A pass through in the vicinity of the left end, respectively. In addition, the upper end and the lower end of the cylindrical member 73B are penetrated and fixed near the right end. Each of the pulling members 74 and 75 has a shape in which one vertex P of the pentagon protrudes to one side in the width direction, and the centroid G is positioned at the positions of the cylindrical members 73A and 73B (centers of the cylindrical members 73A and 73B). It is in a shape that is eccentric by an eccentric amount e on the projecting vertex P side than on the connecting line (see FIG. 12).
[0068]
The columnar members 73A and 73B are disposed substantially parallel to each other so as to sandwich the wedge-shaped projections 65A and 65B and the wedge-shaped projections 66A and 66B in contact with the outer wedge surfaces. The wedge-shaped projections 65A, 65B, 66A, and 66B And a wedge portion engaged with the wedge. Further, the bottom plate 72 is fixed from the side opposite to the projecting apex P to approximately the center of the left and right sides of the tension members 74 and 75. Bolt insertion holes 76 are opened in the bottom plate 72.
[0069]
The joint member 71 has a wedge-shaped projection 65A from the side opposite to the bottom plate 72 (projection vertex P side) so that the wedge-shaped projections 65A, 65B and the wedge-shaped projections 66A, 66B are sandwiched between the cylindrical members 73A, 73B. , 65B and wedge-shaped projections 66A, 66B. Then, by tightening the nut 34 provided at the end of the bolt 33 inserted through the bolt insertion hole 76, the columnar members 73A and 73B are engaged with the wedge surface, and the connection of the segments 1A and 1B by the action of the wedge due to this engagement. Is made strong.
[0070]
In the present embodiment, by employing the joint member 71 having such a configuration, the following new functions and effects can be obtained in addition to the functions and effects similar to those of the first embodiment. it can.
[0071]
First, the manufacture of the joint member 71 can be facilitated. That is, in the joint member 11 according to the first embodiment, it is necessary to form inclined surfaces that fit the wedge surfaces of the wedge-shaped projections 65A, 65B66A, 66B in the wedge portions 13A, 13B. Accuracy is required. On the other hand, in the joint member 71, since the cylindrical members 73A and 73B are wedge portions, a wedge-shaped protrusion is provided between the cylindrical members 73A and 73B only by appropriately spacing the cylindrical members 73A and 73B. 65A, 65B and wedge-shaped projections 66A, 66B can be sandwiched, and a sufficient wedge action can be obtained. Therefore, in the manufacture of the joint member 71, a particularly high processing accuracy is not required, the manufacture can be easily performed, and the manufacturing cost can be reduced.
[0072]
Second, the centroid G of the tension members 74 and 75 is shifted by an eccentric amount e on the opposite side of the bottom plate 72 from the line connecting the centers of the cylindrical members 73A and 73B. Such bending moment can be reduced, whereby the joint member 71 can be reduced in size and weight and cost.
[0073]
This will be described with reference to FIG. Although FIG. 12 shows the tension member 74 side, the same applies to the tension member 75 side.
[0074]
As shown in the figure, when the nut 34 is tightened, the joint member 71 pushes the wedge-shaped projections 65A, 65B, 66A, 66B into the pushing force F ₀ It is pushed in. As a result, the cylindrical members 73A and 73B of the joint member 71 are pushed by the pushing force F from the wedge-shaped projections 65A, 65B, 66A, and 66B. ₀ Reaction force F and a horizontal force H that tries to spread left and right act.
[0075]
For this reason, the horizontal force H and the reaction force F are applied to the pulling members 74 and 75 from the cylindrical members 73A and 73B, and the bending moment M due to the reaction force F is applied. _F Occurs. In this case, the centroid G of the pulling members 74 and 75 is lower than the line connecting the centers of the cylindrical members 73A and 73B (that is, the point of action of the horizontal force H and the reaction force F on the pulling members 74 and 75). Since the eccentric amount e is eccentric to the side opposite to the face plate 72 (that is, the side into which the joint member 71 is pushed), the eccentric bending moment M due to the horizontal force H is applied to the pulling members 74 and 75. _H Occurs, and this eccentric bending moment M _H And bending moment M _F Is a moment acting in the direction of canceling each other.
[0076]
Thus, since the bending moment generated in the tension members 74 and 75 is reduced by cancellation, a relatively thin plate can be used as the tension members 74 and 75. Accordingly, the joint member 71 can be reduced in size and weight, and the cost can be reduced by reducing the material cost.
[0077]
FIG. 13 shows a segment joint according to a third embodiment of the present invention.
[0078]
In the present embodiment, as shown in the figure, the joint surface 9A of the segment 1A has a recess 3A formed at one end, and a joint member 51A is erected at a predetermined position near the other end. The Further, on the joint surface 9B of the segment 1B, a joint member 51B is erected at a predetermined position near the end facing the recess 3A, while a recess 4B (not shown) is provided at the end facing the joint member 51A. It is formed. In the recesses 3A and 4B, wedge-like projections 5A and 6B extending in the tunnel axis direction are provided, as in the first embodiment. Further, a guide member 60 extending in the tunnel axial direction is attached to the joint surface 2A at a substantially center in the tunnel radial direction in a state where substantially half of the circular cross section is embedded, and the guide member 60 is just attached to the joint surface 2B of the segment 1B. The guide means is configured together with the recessed groove 8 formed so that the non-embedded portions of 60 are fitted. The configurations of the seal grooves 9A and 10A on the joint surface 2A and the seal grooves 9B and 10B on the joint surface 2B are the same as those in the first embodiment.
[0079]
The joint members 51A and 51B are respectively provided with joint member main bodies 52A and 52B extending substantially vertically from the joint surfaces 9A and 9B, and the distal end portions of these joint member main bodies 52A and 52B are bent toward the wedge-shaped projections 5A and 6B, respectively. The wedge portions 53A and 53B are provided. Further, a pair of pulling members 54A and 55A are provided above and below the joint member main body 52A. One end of each of the pulling members 54A and 55A is fixed to the wedge portion 53A, and the other end is fixed to the joint surface 9A. A pair of tension members 54B and 55B are provided above and below the joint member main body 52B. One end of each of the tension members 54B and 55B is fixed to the wedge portion 53B, and the other end is fixed to the joint surface 9B.
[0080]
The joint members 51A and 51B can be configured, for example, by embedding approximately half of the joint members 11 and 21 in the first embodiment at predetermined positions on the joint surfaces 9A and 9B.
[0081]
In connecting the segments 1A and 1B in the present embodiment, first, the guide member 60 and the groove 8 are fitted at a position where the segment 1B is shifted to the front side in the figure. Next, when the segment 1B is slid from this state to the segment 1A side (the back side in the figure), the wedge portions 53A and 53B of the joint members 51A and 51B are wedge-coupled with the wedge-shaped protrusions 5A and 6B, respectively. . By the action of the wedge coupling, a compressive force is introduced into the guide member 60 and a tensile force is introduced into the joint members 51A and 51B, respectively, and the segments 1A and 1B are firmly connected.
[0082]
Since the slides of the segments 1A and 1B are guided by the guide member 60 and the concave groove 8, the seal grooves 9A, 10A and 9B and 10B slide at positions that are correctly opposed to each other. The sealing material disposed on 9B and 10B is not peeled off or damaged.
[0083]
As described above, according to the present embodiment, since the tensile axial force can be introduced into the joint members 51A and 51B simply by sliding the segments 1A and 1B, the fastening operation of the segment joint becomes extremely easy, and a member such as a bolt can be attached. Can be reduced.
[0084]
14 to 16 show a fourth embodiment of the present invention.
[0085]
As shown in FIG. 14, in the present embodiment, compared with the third embodiment, the joint surfaces 2A and 2B of the segments 1A and 1B are inclined surfaces with a predetermined angle θ with respect to the tunnel axis direction X. Is different. As a result, when the segments 1A and 1B are connected, the joint surfaces 2A and 2B of the segments 1A and 1B themselves are joined in a wedge shape. Due to the action of the wedge joining, the tension members 54A and 54B and 54B and 55B Therefore, a larger tensile axial force is introduced, and the fastening of the segment joint can be easily made strong.
[0086]
In the present embodiment, since the joint surfaces 2A and 2B themselves are wedge-coupled, the wedge-shaped projections 5A and 6A and the wedge portions 53A and 53B are not necessarily wedge-coupled as in the third embodiment. Sufficient fastening force can be obtained. Therefore, in the present embodiment, the bent engaging portions 56A and 56B of the joint members 51A and 51B are not provided with a wedge-shaped inclined surface, and the engaging portions 56A and 56B are used as the wedge-shaped protrusions 5A of the third embodiment. , 6B are engaged with engaging members 61A, 61B projecting in the recesses 3A, 4B, respectively (however, the protruding member 61B is not shown). As described above, according to the present embodiment, it is not necessary to form a wedge surface on the joint members 51A and 51B and the engaging members 61A and 61B.
[0087]
As shown in FIGS. 15 and 16, the segment has four types according to the combination of the inclination directions of the joint surfaces, that is, a trapezoid type in which the existing segment ring 40 side has a long side when the segment ring is viewed from above. a, a trapezoidal type k having a short side on the existing segment ring 40 side, a parallelogram type b having a left slope, and a parallelogram type c having a right slope are conceivable. When actually forming a segment ring, as shown in FIGS. 15 and 16, for example, these four types of segments may be appropriately combined and formed.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a first embodiment of the present invention.
FIG. 2 is a cross-sectional view showing fastening of a joint member.
FIG. 3 is a sectional view of the same.
FIG. 4 is an explanatory view showing a joint fastening procedure in the same manner.
FIG. 5 is also an explanatory diagram.
FIG. 6 is also an explanatory diagram.
FIG. 7 is a cross-sectional view showing the fastening of the joint member.
FIG. 8 is a sectional view of the same.
FIG. 9 is a cross-sectional view showing fastening of a joint member according to a second embodiment of the present invention.
10 is a sectional view taken along the line XX of FIG.
11 is a sectional view taken along the line YY of FIG.
FIG. 12 is a view for explaining a bending moment acting on the pulling member.
FIG. 13 is a perspective view showing a third embodiment of the present invention.
FIG. 14 is a perspective view showing a fourth embodiment of the present invention.
FIG. 15 is an explanatory diagram showing an example of connecting segments in the same manner.
FIG. 16 is an explanatory diagram showing an example of connecting segments in the same manner.
FIG. 17 is a perspective view showing a joint plate in a conventional segment joint.
FIG. 18 is a cross-sectional view showing fastening of a segment by a conventional segment joint.
[Explanation of symbols]
1A, 1B segment
2A, 2B joint surface
3A, 3B recess
4A, 4B recess
5A, 5B wedge-shaped projection
6A, 6B wedge-shaped projection
7 Guide tube
8 groove
11 Joint members
13A, 13B Wedge
14 Tensile member
15 Tensile member
21 Joint members
23A, 23B Wedge
24 Tensile member
25 Tensile member
31A, 31B Outer peripheral side main reinforcing bars
32A, 32B Inner surface side main reinforcing bars
33 volts
34 nuts
51A, 51B Joint member
53A, 53B Wedge
54A, 54B Tensile member
55A, 55B Tensile member
56A, 56B Engagement part
60 Guide members
61A, 61B engaging member
65A, 65B wedge-shaped projection
66A, 66B wedge-shaped projection
71 Joint member
72 Bottom plate
73A, 73B Cylindrical member
74, 75 Tensile member

Claims (8)

In the segment joint that joins the segments for tunnel lining work,
Concavities formed on both ends of the joint surface of the segment in the tunnel axis direction,
Wedge-shaped projections fixed to the bottom surfaces of these concave portions in the tunnel axis direction,
A joint member having a pair of wedge portions for sandwiching a pair of wedge-shaped protrusions of the segments to be coupled from both sides;
A pulling means for pushing the joint members toward the wedge-shaped protrusions by pulling a pair of joint members respectively disposed in the concave portions on both sides of the segment to engage the wedge-shaped protrusions and the wedge portions;
Guide means for guiding two segments to be connected to each other in the tunnel axis direction ,
The joint member includes a pair of upper and lower tension members that join the upper and lower ends of the pair of wedge portions, and the positions of the upper and lower tension members in the tunnel radial direction are the positions of the outer peripheral surface side main reinforcing bars and the inner peripheral surface side of the segments, respectively. A segment joint characterized by substantially matching the position of the main rebar . In the segment joint that joins the segments for tunnel lining work,
Concavities formed on both ends of the joint surface of the segment in the tunnel axis direction,
Wedge-shaped projections fixed to the bottom surfaces of these concave portions in the tunnel axis direction,
A joint member provided with a pair of columnar members that sandwich a pair of wedge-shaped projections of the segments to be coupled from both sides, and a pair of pulling members that join both ends of these columnar members;
A pulling means for pushing the joint members into the wedge-shaped projections by pulling together a pair of joint members respectively disposed in the concave portions on both sides of the segment, and engaging the wedge-shaped projections between the cylindrical members;
A segment joint comprising: guide means for guiding two segments to be connected to each other in the tunnel axis direction . The segment joint according to claim 2, wherein the centroid of the tension member is eccentric in a direction in which the joint member is pushed in relative to a position where the pair of columnar members are fixed to the tension member . The guide means includes
A guide member attached in a state in which approximately half of the cross section is embedded in the center of one joint surface of the segments to be connected, extending in the tunnel axis direction;
A concave groove formed so that the non-embedded portion of the guide member is fitted to the other joint surface;
The segment joint according to any one of claims 1 to 3, characterized by comprising: The guide means includes
A guide pipe attached in a state where substantially half of the cross-section extends in the tunnel axis direction at substantially the center of one joint surface of the segments to be connected;
A concave groove formed so that a non-embedded portion of the guide member is fitted to the other joint surface, and at least a part of the pulling means is provided in the guide tube. The segment joint according to any one of claims 1 to 3 . The pulling means includes a bolt inserted into the guide member, and fixes one of the joint members on both sides in the tunnel axial direction of the segment to one end of the bolt and forms the other end of the bolt on the other of the joint members. The segment joint according to claim 5 , wherein the joint member on both sides of the segment is pulled close to each other by screwing a nut attached to the other end of the bolt through the bolt insertion hole . The segment joint according to any one of claims 1 to 6, wherein the concave portion is opened in an outer peripheral surface of the segment. The segment joint according to any one of claims 1 to 7, wherein the concave portion is not opened on a segment inner peripheral surface .

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