JP4546868B2 - Segment connection structure - Google Patents

Description

  The present invention relates to a connecting structure of segments for constructing a tunnel lining segment such as a sewer, a railway, an underground river, or a box culvert.

  When constructing tunnels such as sewers, railways, underground rivers, etc. by shield construction, they are constructed by connecting a number of arc segments. Steel segments, steel-concrete composite segments, concrete segments, and the like are applied to the segments used for such tunnel lining and the segments used for box culverts. These segments are provided with joints. This joint is generally fixed to the concrete of the segment via an anchor reinforcing bar, and a tunnel or a box culvert is constructed by connecting a number of segments in the circumferential direction and the axial direction via this joint. It will be. Therefore, this joint part plays an especially important role in performing construction using segments, and many proposals have been made in the past.

  Conventionally proposed joint structures also have various improvements. For example, (1) the main improvement is to simplify the structure of the joint, (2) the main improvement is to improve the water stoppage of the joint, (3) the joint The main improvement is to facilitate the connecting operation, (4) the main improvement is to improve the strength of the joint portion to the same extent as the segment body, and (5) the plurality of points described above. The main improvement is to improve simultaneously. In addition, this improved technique is naturally different in structure depending on the steel segment, the steel-concrete composite segment, and the concrete segment.

  Conventionally, Patent Documents 1 and 2 have been proposed for this type of segment connection structure.

  In Patent Document 1, in a concrete segment, as a joint structure for increasing the strength and rigidity of both the segment main body and the joint portion, a connection groove portion having a substantially lip groove cross section is provided at both ends in the circumferential direction of the segment main body. A segment connection structure is disclosed in which a joining key is inserted from the segment surface direction (tunnel axis direction) across the connection groove portions of segments adjacent in the circumferential direction. In this segment connection structure, the joint metal fittings installed at the end of the segment are bolted directly to the side surface of the steel member end with a plurality of mounting bolts, and the joint metal fittings are made of ductile cast iron. The rigidity can be improved. In addition, there is an advantage that the segments can be easily joined through the joining key.

Patent Document 2 relates to a joint of a composite segment that is effective when a large bending moment or tensile force acts such as a large cross section, a large depth, or an underground river, and has a structure in which the joint has the same strength and rigidity as the segment body. Is disclosed. And, as a method of realizing a segment joint with high rigidity and high yield strength, a box-shaped reinforcing member whose inner side is open is arranged on the side edge of the inner hollow steel plate of the segment so as to straddle the segment joint adjacent in the circumferential direction. The structure which bolt-joins to the said inner side steel plate is disclosed.
JP-A-8-184296 Japanese Unexamined Patent Publication No. 7-62988

  However, in the segment connecting structure disclosed in Patent Document 1, adjacent segments are connected by a joining key formed in an H shape or an I shape, and an intermediate portion of the joining key formed in an H shape or an I shape is provided. It plays a role as a web. For this reason, when a bending load is applied to the joint portion, the web resists bending, and the secondary moment of section in the segment joint portion cannot be increased efficiently, which is uneconomical. In order to increase the bending strength of the joint, the thickness of the joining key must be increased, which is uneconomical. Also, simply by inserting the joining key into the connecting hole, the joining key is not mechanically fixed to the segment joint, and the joining key may fall out of the connecting groove when it is placed at an angle. The request for improvement was growing.

  In the segment connection structure disclosed in Patent Document 2, there is a problem in that the box-shaped reinforcing member arranged on the inner space side steel plate of the segment protrudes toward the inner space side of the segment, and the flatness of the inner surface of the segment cannot be ensured. Moreover, it is necessary to inject the grout into the concave portion formed on the back side (that is, the natural mountain side) of the box-shaped reinforcing member, and there is a problem that it takes construction cost and labor.

  The present invention has a configuration in which the ring joint portion of the segment has the same high rigidity and high proof stress as the segment body with respect to tensile load and bending load, and the configuration is simple and the joint portion is out of the segment surface. However, it is an object of the present invention to provide a segment connecting structure that solves the conventional problems by being configured to ensure the flatness of the segments.

The inventor has solved the above-described problems, and [1] further improved the strength of the joint portion of the segment, [2] improved resistance to bending load acting on the joint portion, [3] simplified structure, 3) In a structure in which segment members are connected in the tunnel circumferential direction and the axial direction by using joint members in order to improve workability, the joint members are engaged with the connection members on both sides in the segment width direction as joint members. Fixing the joint metal exposed to the outside, and providing a connecting member having a connecting function between the segments and between the rings, and arranging the connecting members across the adjacent segments in the circumferential direction in the adjacent rings, Invented the connecting structure of the segments connected to the joint hardware provided in the segments. At this time, the connecting member is formed in a hollow box shape in which the joint surface surrounded by the flange and the web opens to the joint part side with the joint hardware, and the lower flange from the outer surface of the upper flange in the connecting member The size up to the outer surface of is assumed to be approximately the same as the digit height of the segment.

That is, the first invention is a segment connection structure in a structure formed by connecting a segment member in a tunnel circumferential direction and an axial direction using a joint member. the engaging portion together when securing the joint hardware that is exposed outside, have a connecting function between the segments, a hollow box-shaped junction plane surrounded by the flange and the web are open to the junction side of the bonding hardware of The connecting member is provided, and the connecting member is disposed on the joining portion side of the preceding ring and the succeeding ring across the circumferentially adjacent segments, and the inner surface is on the outer surface of the joint hardware provided in each segment. it connects the connecting member so as to cover the same time in contact, in the coupling member, the outer surface of the lower side of the flange from the outer surface of the upper flange or The size, characterized in that it is a segment of girder height and substantially equal.

  Moreover, 2nd invention is attached so that the inner surface may contact the outer surface of the joining metal object which consists of a box shape, C shape, or H shape in 1st invention, and this may be covered. It is characterized by.

Further, the third invention is a connecting structure of segments in a structure formed by connecting a segment member in a tunnel circumferential direction and an axial direction using a joint member, and connecting members on both sides of the segment width direction as joint members between the segments. substantially the engaging portion is fixed a junction hardware exposed to the outside, a connecting function between the segments, a C-shaped member having a flange and a web, or upper and lower steel plates apart after a short It is configured by arranging in parallel, and a connecting member that is fastened to each other by bolts is provided with the joint hardware , and the connecting member is disposed on the joint portion side of the preceding ring and the succeeding ring across the adjacent segments in the circumferential direction. And connecting the connecting member so that the inner surface is in contact with and covers the outer surface of the metal fitting provided in each segment, in the connecting member, Size from the outer surface on the side of the flange to the outer surface of the lower flange, characterized in that it is a segment of girder height and substantially equal.

  The fourth aspect of the invention is the first aspect of the first to third aspects, wherein the secondary moment of section with the segment body girder centerline of the connecting member as an axis is the approximate second moment of section of the segment body. It is characterized by being 1/2 or more.

  In addition, a fifth invention is characterized in that, in any one of the first to fourth inventions, the connecting member and the joint hardware are connected by a bolt or a one-way insertion type joint.

  In addition, a sixth invention is characterized in that, in any one of the first to fifth inventions, the connecting member and the segments attached thereto are joined to each other by welding or friction joining.

  In addition, a seventh invention is characterized in that, in any one of the first to sixth inventions, the connecting member and / or the joint hardware is made of a shape steel.

  According to the present invention, the connecting structure for connecting the segments is the connecting member for fixing the joint metal with the engaging portion exposed to the outside at the end in the segment width direction as one joint member and connecting the joint metal to the joint metal as the other joint member. Since the connecting member is arranged so as to straddle the adjacent segments in the circumferential direction and is connected to the joint hardware provided in each segment, the connecting member between the segments by the connecting member having a large sectional moment of inertia is provided. Connection is possible, the connection structure of the joint part exhibits the same rigidity and strength as the segment body, can strongly resist the tensile and bending loads acting on the joint part, and the connection member is a segment joint and a ring joint. It can also be used, the number of members can be reduced, and the structure is simple. In addition, since it is not necessary to separately provide a ring joint on the side surface of the segment, it is possible to omit the labor for processing the segment. By attaching the connecting member to the segment in advance, it is not necessary to transport the connecting member separately, and the processing work at the time of assembling the segment can be reduced. Furthermore, there is no unevenness | corrugation in the segment surface direction in a segment coupling part, and the flatness of a segment is securable. Thus, this invention can implement | achieve the connection structure of the segment joint part excellent in the workability and the manufacture surface compared with the past.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 to 26 show an embodiment of the present invention. First, the basic configuration of the present invention will be described with reference to FIGS. FIG. 1 shows a joint portion of each segment when a plurality of segments 3 are assembled in a ring and connected in a staggered manner in the tunnel axis direction. In the figure, arrow A indicates the tunnel axis direction and B indicates the circumferential direction. The segment 3 in the preceding ring 4 is shown on the left of FIG. 1, and the connection mode in the circumferential direction of the segment 3 in the trailing ring 5 is shown on the right of the drawing. The segment 3 is configured as a synthetic segment in which a steel shell composed of the main beam 1, the joint plate 27, and a skin plate (not shown) is filled with concrete.

  The present invention is characterized in that, in a joint for connecting the segments 3 in a staggered arrangement, the joint member is composed of the connecting member 2 and the joint metal 6 that engages with the connecting member 2. Here, the metal joint 6 is a joint member that is provided at both ends of the segment 3 in the width direction and engages with the connecting member 2. The connecting member 2 is a joint member that is disposed across the connected rings and engages with two joining hardware 6 adjacent in the circumferential direction. Therefore, the connecting member 2 combines the function as an inter-ring joint for connecting the rings connected to each other and the function as a segment joint for connecting the circumferential segments 3. Hereinafter, various forms in the connecting member 2 and the metal joint 6 will be described.

  FIGS. 1 to 3 show an example in which the peripheral four sides are surrounded by a flange 19 and a web 20 and are formed of a hollow box-shaped connecting member 2a having an open joint surface. Moreover, the example with which the metal fitting 6 was comprised by the box-shaped metal fitting 6a with which 6 surfaces were closed is illustrated. FIG. 2 is a perspective view of the box-shaped joint hardware 6a, and FIG. 3 is a cross-sectional view thereof.

In FIG. 1, the hollow box-shaped connecting member 2 a is provided on the side surface portion of the segment main beam 1 and in the central portion in the axial direction. The hollow box-like connecting member 2a is provided with a flange 19 and a web 20 made of steel plates along the four sides of the upper, lower, left and right sides, and the rear end thereof is fixed to the main girder 1 by welding. Therefore, a hollow portion having an open front surface is formed inside the hollow box-shaped connecting member 2a.

Since the hollow box-shaped connecting member 2a also functions as an inter-ring joint, in order to ensure a predetermined shear strength as the ring joint, the hollow box-shaped connecting member 2a is attached at the rear end position of the hollow portion as shown in FIGS. The contact plate 17 is fixed to the flange 19 and the edge of the web 20, and the hollow box-shaped connecting member 2 a is fixed to the main girder 1 by friction bonding by the bolt 11 passing through the splicing plate 17 and the main girder 1. If necessary, the end of the splicing plate may be fillet welded to increase the yield strength in the direction of the shearing force. The size from the outer surface of the upper flange 19 constituting the hollow box-shaped connecting member 2a to the outer surface of the lower flange 19 is substantially the same as the digit height of the segment. Thereby, the flatness in the main girder 1 of a segment can be ensured, and also the strength of the segment joint portion can be ensured.

In addition, a one-way insertion type male joint member 9 is provided so as to be positioned in the hollow portion of the hollow box-shaped connecting member 2 a, and its proximal end is fixed to the surface of the attachment plate 17. In order to secure the strength of the joint portion, the hollow box-shaped connecting member 2a may be provided at both end portions in the segment width direction.

  The box-shaped joint metal 6a is disposed in a recess 7 formed by cutting out the corner of the segment body 3a into an L shape. The recess 7 is formed by notching the circumferential end of the main beam 1 and recessing a concrete portion filled inside the main beam 1. As shown in FIGS. 2 and 3, the box-shaped metal fitting 6a is formed of a steel plate and has a rectangular cylinder with six surfaces closed. It is provided not to be. Further, an insertion hole 32 and a one-way insertion type female member 9 are provided on the front web 34 of the box-shaped metal fitting 6a. In the L-shaped concave portion 7, the box-shaped joint metal 6a and the segment main body 3a may be fixed by means such as welding or bolt joining. For example, as shown in FIG. In addition to reinforcing with 33, an anchor bar 28 is provided on the flange 31 on the back surface of the box-shaped joint metal 6a, and the anchor bar 28 is inserted into the reinforcing metal 33 and embedded in the filled concrete to increase the tensile resistance. The box-shaped joint metal 6a can be firmly fixed to the segment body 3a.

  In FIG. 1, two box-shaped joints 6 a are adjacent to each other in the circumferential direction by abutting the segments 3 adjacent in the circumferential direction of the trailing ring 5. It becomes possible to fit the two box-shaped metal fittings 6a into the hollow box-shaped connecting member 2a. At this time, a gap 8 having a width in which the web 20 of the hollow box-shaped connecting member 2a can be fitted is formed between the two box-shaped fittings 6a and the side surface of the L-shaped recess 7. Accordingly, the web 20 of the hollow box-shaped connecting member 2a can be fitted to the outside of the two box-shaped joint hardware 6a through the gap 8. Further, in order to facilitate the insertion of the hollow box-shaped connecting member 2a into the box-shaped joint metal 6a, a taper is provided so that the distance between the ends of the web 20 on both sides of the hollow box-shaped connecting member 2a is widened toward the opening. The web 34 of the box-shaped joint metal 6a that comes into contact with these may also be tapered at the same angle.

  Further, as shown in FIGS. 10 and 11, the size between the outer surfaces of the upper and lower flanges 31 in the box-shaped joint metal 6 takes into account the height of the segments 3 and the thickness of the flange 19 of the hollow box-shaped connecting member 2a. It has been adjusted above.

  In this way, in the present invention, the two box-shaped joints 6a that are in contact with each other in the circumferential direction are simultaneously wrapped by the hollow box-shaped member 2a, and the one-way insertion type joy male member 9 is 10 is engaged so that they do not escape. Further, by bringing the outer surface of the box-shaped joint metal 6a into contact with the inner surface of the hollow box-shaped member 2a, excellent characteristics can be obtained from the viewpoint of strength.

  As described above, according to the connection structure of FIGS. 1 to 3, the hollow box-shaped member 2 a wraps the box-shaped joint metal 6 a, thereby forming a first male-female fitting portion between the two members. Due to the male / female fitting part, due to the surface pressure of the contact part, the bending acting on the segment, the same high rigidity and high proof stress as the segment main body 3a against the tensile load, and the shearing acting on the joint part between the rings It is possible to exert the necessary proof strength in terms of proof strength. Furthermore, the second male / female fitting portion can be formed by engaging the one-way insertion type male male member 9 and the one-way insertion type male female member 10 with each other. Thus, it is possible to ensure a predetermined design strength against a tensile load acting on the joint portion of the segment ring. Moreover, since the hollow box-shaped member 2a fits in the outer shape of the segment when fitted into the box-shaped joint metal 6a, the flatness of the segment 3 can be ensured.

The joint metal 6 includes an H shape and a C shape in addition to the box-shaped joint metal 6a. 4 and 5 show an example in which the metal joint 6 is formed of an H-shaped metal joint 6b, FIG. 4 is a perspective view, and FIG. 5 is a cross-sectional view. The H-shaped joint metal 6b is disposed in the concave portion 7 at the corner of the segment body 3a in FIG. The H-shaped joint metal 6 b is composed of a web 23 and a flange 22, and a one-way insertion type female joint member 10 is fixed to the front surface of the web 23. The direction of the web 23 surface of the H-shaped joint metal 6b is desirably matched with the segment beam height direction in order to exhibit high strength as an inter-segment joint. Further, it is desirable that the flange 22 of the H-shaped joint metal 6b is in contact with the web 20 of the hollow box-shaped connecting member 2a.

Further, the fixing means between the H-shaped joint metal 6b and the segment main body 3a arranged in the L-shaped recess 7 may be arbitrary, such as welding or bolt joining. For example, as shown in FIG. 20, the L-shaped concave portion 7 is reinforced by an angle-shaped reinforcing metal member 33, and an anchor bar 28 is provided on the back surface of the web 23 of the H-shaped connecting metal member 6b. And then embed in filled concrete. As a result, the tensile resistance can be increased, and the H-shaped joint metal 6b can be firmly fixed to the segment body 3a.

  The H-shaped joint metal 6b abuts the end portions of the segment main bodies 3a adjacent to each other in the circumferential direction so that the side surfaces of the flange 22 of each H-shaped joint metal 6b come into contact with each other. At this time, a gap 8 having a width capable of fitting the web 20 of the hollow box-shaped connecting member 2a is formed between each H-shaped metal fitting 6b and the side surface of the L-shaped recess 7. The structure of the hollow box-shaped connecting member 2a into which the H-shaped metal fitting 6b is fitted is the same as that shown in FIG.

  Also in this H-shaped joint metal 6b, the hollow box-shaped member 2a has two H-shaped joint hardware by bringing the segment 3 in the trailing ring 5 formed by contacting the circumferential end of the segment 3 close to the preceding ring 4. It fits so that 6b may be wrapped simultaneously. At the same time, the one-way insertion type male male member 9 is inserted into the one-way insertion type male female member 10 so that they can be engaged so as not to escape from each other. At this time, the web 20 of the hollow box-shaped member 2 a is inserted into the gap 8 between the outer surface of the two H-shaped metal fittings 6 b and the side surface of the L-shaped recess 7.

  In this way, the hollow male member 2a simultaneously wraps the two H-shaped metal fittings 6b adjacent in the circumferential direction, thereby forming a first male-female fitting portion between the two members, and further, a one-way insertion type joy male member. 9 and the one-way insertion-type joint female member 10 are engaged to form a second male-female fitting portion, and the first and second male-female fitting portions provide a joint portion between the segments and between the rings. With respect to the tensile load, the bending load, and the shearing load acting on the segment body 3a, the same high rigidity and high proof stress as the segment main body 3a or a proof strength necessary for design can be exhibited. Moreover, since the hollow box-shaped member 2a is accommodated in the outer shape of the segment when fitted to the H-shaped metal fitting 6b, the flatness of the segment 3 can be ensured.

6 and 7 show an example in which the metal joint 6 is composed of a C-shaped counter metal joint 6c, FIG. 6 is a perspective view, and FIG. 7 is a plan view. The C-shaped joint metal 6 c is configured by facing the groove portions of the two C-shaped members 6 c-1 composed of the web 25 and the flange 24 and welding the end portions thereof to the front side surface of the mounting plate 18. A one-way insertion type female joit female member 10 is fixed to the front surface of the mounting plate 18 at an intermediate portion between the two C-shaped members 6c-1 facing each other. Further, as shown in FIG. 21, an anchor bar 28 is provided on the back surface of the mounting plate 18. By embedding the anchor bar 28 in the concrete, the C-shaped joint 8 is formed in an L shape at the corner of the segment body 3a. It adheres to the concave part 7.

  The side surfaces of the webs 25 of the respective C-shaped members 6c-1 are brought into contact with each other by abutting the end portions of the segments 3 adjacent to each other in the circumferential direction. At this time, a gap 8 having a width in which the web 20 of the hollow box-shaped connecting member 2 a can be fitted is formed between each C-shaped joint metal 6 c and the side surface of the L-shaped recess 7. The structure of the hollow box-shaped connecting member 2a into which the C-shaped fitting 6c is fitted is the same as in FIG.

Even in the C-shaped joint 6c, the hollow box-shaped member 2a is contacted in the circumferential direction by bringing the segment 3 in the trailing ring 5 formed by contacting the circumferential end of the segment 3 close to the preceding ring 4. The two C-shaped metal fittings 6c that are in contact with each other are fitted so as to be wrapped at the same time. At the same time, the one-way insertion type male male member 9 is inserted into the one-way insertion type male female member 10 so that they can be engaged so as not to escape from each other.

Further, the outer surface of the web 25 of the C-shaped joint metal 6c is provided so as to be in contact with the inner surface of the web 20 of the hollow box-shaped member 2a. At this time, the web 20 of the hollow box-shaped member 2a is inserted through the gap 8 between the outer surface of the two C-shaped joining hardware 6C and the side surface of the L-shaped concave portion 7, thereby the C-shaped joining. It will be fitted to the hardware 6c.

In this way, the hollow box-shaped member 2a encloses the C-shaped joint metal 6c to form the first male / female fitting portion, and the one-way insertion type male member 9 and the one-way insertion type female member 10 are engaged. By doing so, a second male / female fitting portion is formed, and with this first and second male / female fitting portion, a tensile load, a bending load and a shear load acting on the joint portion between the segments and between the rings are applied. Thus, the same high rigidity and high proof stress as the segment main body 3a or the proof strength necessary for design can be exhibited. Moreover, since the hollow box-shaped member 2a fits in the outer shape of the segment when fitted into the C-shaped joint metal 6c, the flatness of the segment 3 can be ensured.

In each embodiment of FIGS. 1-9, as shown in each figure, as a connection means of the hollow box-shaped connection member 2a and the metal joint 6, a one-way insertion type male joit member 9 and a one-way insertion type female member 10 are provided. It is desirable to engage. With this configuration, the joint member 2 and the joint metal 6 can be brought close to each other so that the joint male member 9 and the joint female member 10 can be engaged with each other by one touch, and the working efficiency can be greatly improved. Along with this, it is possible to open the way to apply the segment connection structure according to the present invention to the shield tunnel.

As this one-way insertion type joint, for example, there is a mechanism for preventing the male joint from coming out of the female joint after inserting the male joint disclosed in JP-A-11-31698 and JP-A-2004-76518 into the female joint. It is desirable to use what is attached. For this reason, in this invention, you may make it provide this function about the one-way-insertion-type joint male member 9 and the joint female member 10 mentioned above.

As shown in FIG. 10, it is desirable that the one-way insertion type male joint member 9 is attached to the web 20 of the connecting member as shown in FIG. Further, the one-way insertion type male joint member 9 may be attached to the flange 11 as shown in FIG.

  FIG. 10 shows another embodiment of the connecting member 2 having a web 20 on the back surface, and a C shape with a male joint in which the base end of the one-way insertion type male male member 9 is fixed to the front surface of the groove portion of the back surface web 20. The connecting member 2b is also shown. The back surface of the web 20 is fixed to the side surface of the main girder 1 by welding or bolting. Note that a box shape having an open front surface integrally including the web 20 may be used (not shown). In FIG. 10, the metal joint 6 is composed of a box-shaped metal joint 6d with six faces closed, a joint male material insertion hole is formed in the front web 34, and the one-way insertion type female joit female material 10 is fixed to the inside. An example is shown. Also in this embodiment, the upper and lower flanges 19 of the C-shaped connecting member 2b wrap the upper and lower flanges 24 of the box-shaped joint metal 6d so that the first male-female fitting portion is formed between the two members. A second male-female fitting portion is formed by the direction-insertion type male male member 9 engaging with the female female member 10. With the formed first and second male / female fitting portions, the same high rigidity as that of the segment main body 3a with respect to the tensile load, bending load and shear load acting on the joint portion between the segments and between the rings, High proof strength or proof strength necessary for design can be exhibited.

  FIG. 11 shows the C-shaped connecting member 2b shown in FIG. 10, in which the proximal end of the second one-way insertion type male member 9 is fixed to the distal end of the flange, and correspondingly, the segment 3 in the trailing ring 5 In addition, an example is shown in which a second one-way insertion type female member 10 for engaging the second male member 9 is provided. The other structure is the same as the joint part of FIG.

  Also in the embodiment of FIG. 11, the upper and lower flanges 19 of the C-shaped connecting member 2b wrap the upper and lower flanges 31 of the box-shaped joint metal 6d, whereby a first male-female fitting portion is formed between both members, and A second male-female fitting portion formed by engaging the one-way insertion type male joist female member 10 of the opposite segment 3 with the one-way insertion type male male member 9 provided on the web 25 and the flange 24 is formed. The first and second male / female fitting portions have the same high rigidity and high yield strength as the segment main body 3a against tensile load, bending load, and shear load acting on the joint portion between the segments and between the rings. Or, the proof stress necessary for the design can be exhibited.

  Moreover, the magnitude | size of the hollow box-shaped connection member 2a in each embodiment of FIGS. 1-9 is comprised so that the following conditions may be satisfy | filled. That is, as shown in FIG. 18, the size of the connecting member 2 such as the hollow box-shaped member 2a is such that the thickness of the flange 19 × width W × 2 (both upper and lower flanges) × the material tensile strength against the tensile load> Provide a tensile load. The dimension of L is the minimum length that allows the one-way insertion joints 9 and 10 to be mounted. Further, with respect to the bending load acting on the joint portion, when the attachment plate 17 is integrally attached to the connecting member 2a by welding or the like as shown in FIGS. The flange plate thickness × width W is determined so that the cross-sectional secondary moment of the U-shaped cross section made of the plate 17 is equal to or greater than the cross-sectional secondary moment necessary for resisting the bending load. In particular, in order to exhibit the bending strength equivalent to that of the segment main body in the connecting portion, the cross-sectional secondary moment of the connecting material attached to one side in the segment width direction is set to approximately ½ or more of the segment main body. When the attachment plate 17 is not attached, the upper and lower flanges 19 of the connecting material are integrally attached to the segment main girder of the adjacent ring by welding or the like. The flange plate thickness × width W is determined so that the cross-sectional secondary moment is equal to or larger than the cross-sectional secondary moment necessary for resisting the bending load.

  Next, FIG. 12 and subsequent figures show examples in which joints between segments and rings are formed by friction-joining or bearing-bonding the connecting member 2 and the metal fitting 6 with bolts. In the embodiment of FIG. 12, the inter-segment joint and the inter-ring joint are composed of a C-shaped connecting member 2c provided at the center of both side surfaces in the segment width direction, and a joint metal 6e provided at both ends in the segment circumferential direction. Has been. The C-shaped connecting member 2c is configured by fixing the web 20 to the side surface of the main beam 1 by welding or bolt joining. The metal joint 6e is configured by arranging two upper and lower steel plates approximately parallel to each other with a gap therebetween. Bolt insertion holes 12 are formed in the upper and lower two steel plates of the flange 19 of the C-shaped connecting member 2c and the joint metal 6e. In order to ensure the flatness of the segment, the bolt insertion hole on the outer surface of the flange of the C-shaped connecting member 2C is provided with a seat so that the bolt head does not jump out of the segment surface.

  For example, as shown in FIG. 23, the L-shaped recess 7 is reinforced by an angle-shaped reinforcing metal 33 and anchored to the edge of the bonding metal 6e. By providing the bar 28 and penetrating the anchor bar 28 through the reinforcing metal 33 and burying it in the middle-filled concrete, the tensile resistance can be improved and the bonding metal 6e can be firmly fixed to the segment body 3a. In addition, instead of arranging two upper and lower steel plates in parallel with each other, the joining metal piece 6e may be fixed to a side surface of the reinforcing metal piece 33 as shown in FIG.

  In the joint structure of FIG. 12, the adjacent joints 6e are abutted as shown in FIG. 12 by bringing the segments 3 adjacent in the circumferential direction of the trailing ring 5 close to each other, and the preceding joints 6e are opposed to each other. By fitting the inner side of the upper and lower flanges 19 of the C-shaped connecting member 2c of the segment 3 in the ring 4 and inserting the joining bolt into the flange 19 and the bolt insertion hole 12 of the steel plate and fastening the nut to the nut, The parts can be connected by friction welding. Further, at this time, the two metal fittings 6e of the segment 3 adjacent in the circumferential direction in the preceding ring 4 are fitted inside the upper and lower flanges 19 of the C-shaped connecting member 2c of the trailing ring 5, and the bolts of the flange 19 and the steel plate are inserted. By inserting joint bolts into the holes 12 and fastening them to the nuts, the staggered joints of the adjacent rings can be connected by friction joining. In order to ensure the flatness of the segment, the bolt insertion hole 12 is preferably provided with a seat so that the head of the joining bolt does not jump out of the segment surface.

  In the joint portion of FIG. 12, the C-shaped connecting member 2c and the metal fitting 6e are friction-bonded or support-bonded by the bolt 11, thereby resisting the tensile and bending loads acting on the inter-segment joint and the C-shaped connection. The flange surface of the member and the flange surface of the joint metal 6e are in contact with each other, so that the shearing force generated between the rings is resisted, and both functions of the inter-segment joint and the inter-ring joint are used. The number of bolts 11 for friction or bearing connection is the number that can withstand the tensile load generated in the flange by the tensile load and the bending load.

  FIG. 13 shows an example in which the connecting member 2 is replaced by the C-shaped connecting member 2c in FIG. The H-shaped connecting member 2d is configured such that the side surface of the web 20 is welded to the outer side surface of the main beam 1 and half of the upper and lower flanges 19 are embedded in the segment body 3a. By using the H-shaped connecting member 2d, the bending strength of the connecting member is improved. FIG. 14 shows an example in which the connecting member 2 is composed of a connecting member 2e in which steel plates are arranged in parallel up and down. The connecting member 2e may be constructed by welding two steel plates in parallel to the upper and lower edges of the main girder 1. By using the connecting member 2e, the weight of the connecting member can be reduced, and the upper and lower steel plates can be integrated to resist bending load.

  FIG. 15 shows still another embodiment. In this embodiment, the connecting member 2 provided at the center of both side surfaces of the segment is constituted by a steel plate connecting member 2f provided with a plurality of female screw holes 13. A nut or a cap nut is attached to the position of the female screw hole 13 on the back side of the main girder. Correspondingly, the metal fittings 6 provided at both end portions in the circumferential direction of the segment are constituted by steel plate bonding hardware 6f having bolt insertion holes 12. In the corner of the segment 3, a working cavity 21 having an open top surface of the segment is formed by an L-shaped recess 7. The side surface of the steel plate fitting 6f arranged at the front surface position of the recess 7 is closed by the lid plate 14. The lid plate 14 may extend the joint plate and also serve as the joint plate. As shown in FIG. 24, in order to form the cavity 21 for bolt fastening, a simple thin box 29 may be attached to the back surface of the steel plate fitting 6f by an adhesive or by spot welding. Further, the steel plate joint 6f provided along one side of the L-shaped recess 7 at the corner of the segment body 3a is welded or welded to the end of the main girder 1 as shown in FIG. Secure with bolt fastening.

  In the embodiment of FIG. 15, the segment 3 in the trailing ring 5 formed by contacting the circumferential end of the segment 3 in the trailing ring 5 is brought close to the segment 3 in the preceding ring 4. Thereby, the steel plate bonding hardware 6f can be brought into contact with the steel plate connecting member 2f. Next, a bolt (male screw member) is inserted into the bolt insertion hole 12 of the steel plate fitting 6f from the working cavity 21 side and protruded forward, and then fastened to the female screw hole 13 of the steel plate connecting member 2f. The segments 3 in the leading ring 4 and the trailing ring 5 can be combined in a staggered arrangement.

  Also in the joint structure of FIG. 15, the steel plate connecting member 2f and the steel plate connecting hardware 6f are friction-joined by fastening the bolt to the nut simultaneously with the steel plate connecting member 2f coming into contact with the steel plate connecting metal 6f. Accordingly, it is possible to resist the tensile and bending loads acting on the joint between segments and to resist the shearing force generated between the rings, and to ensure a predetermined design strength. Further, the steel plate connecting member 2 f can simultaneously connect the segments 3 adjacent to each other in the circumferential direction of the trailing ring 5. Further, since the steel plate connecting member 2f and the steel plate joint metal 6f can be provided so as to fit within the outer shape of the segment 3 when frictionally joined, the flatness of the segment 3 can be ensured.

  Further, as shown in FIGS. 16 and 17, a steel plate connecting member 2f disposed on the front surface of the main beam 1 in the segment 3 of the preceding ring 4 is provided so that the bolt 11 penetrates from the rear surface of the main beam 1, The steel plate connecting member 2f is brought into contact with the steel plate joining hardware 6f in FIG. 15, the bolt 11 is inserted into the bolt insertion hole 12, and the nut is fastened on the working cavity 21 side inside the steel plate joining hardware 6f. Similarly to FIG. 15, the segments 3 of the preceding ring 4 and the succeeding ring 5 can be connected. The bolt 11 is preferably attached and fixed to the steel plate connecting member 2f in advance, and the nut is preferably tightened when the segment joint is fastened.

  The joint structure shown in the embodiment in FIGS. 12 to 17 is configured to satisfy the following conditions. That is, in the connecting member 2, the strength, diameter, and number of the bolts 11 are determined for each of the friction bonding and the bearing support so as to withstand the design tensile load. Regarding the method for arranging the bolts 11, for example, as shown in "Road Bridge Specification / Description: Steel Bridge Edition (Japan Road Association)", the diameter of the bolt insertion hole 12 depends on the bolt diameter. In order to absorb construction errors, a value obtained by adding 3 mm to the nominal diameter of the bolt, the bolt interval is between the specified minimum interval and maximum interval of the bolt, and the edge distance between the bolt 11 and the connecting member 2 is It shall be more than the specified minimum edge distance so that the edge will not break. The necessary minimum length of the connecting member 2 in the circumferential direction of the segment is the total of the diameter of the bolt hole, the bolt interval, and the edge distance between the bolt and the connecting member end.

  In each of the above embodiments, the connecting member 2 and the metal fitting 6 are fixed to the main girder 1 by welding or bolt joining, or in FIG. 19, FIG. 20, FIG. Although the example in which the anchor bar 28 is firmly fixed to the portion where the main girder 1 has a step by 33 is shown in FIG. 25 and FIG. 26, the gusset is formed on the back surface of the angle-shaped hardware 33 instead of the anchor bar. A plate 30 may be provided, and the angle-shaped metal piece 33 may be fixed to the segment main body 3 a via the gusset plate 30, and the connecting member 2 and the joint metal piece 6 may be welded to the reinforced angle-shaped metal piece 33.

  As a construction procedure of the present invention, the connecting member 2 is attached in advance at a position where the segment joints of the adjacent preceding ring 4 and the succeeding ring 5 come. The connecting member 2 may be attached at the factory or may be attached at the site, but is preferably attached in advance to the segment main beam 1 of the adjacent ring.

The present invention is suitable for joint when assembling the flat segments constituting the like box Karoo Burt, can be applied to the segment and ring joint wearing curvature. In addition, the design of the embodiment may be changed as appropriate.

It is a perspective view which shows the aspect which used the hollow box-shaped connection member and the box-shaped joining metal fitting as a segment coupling member. It is a perspective view of the box-shaped joining metal fitting of FIG. It is sectional drawing of the box-shaped joining metal fitting of FIG. It is a perspective view of a H-shaped joining metal object. It is sectional drawing of an H-shaped joining metal fitting. It is a perspective view of a C-shaped joining metal fitting. It is a top view of a C-shaped joining metal fitting. It is a perspective view of a hollow box-shaped connection member. It is a front view of a hollow box-shaped connection member. It is a side view of other embodiments of a connecting member and a metal joint. It is a side view of other embodiment of a connection member and a metal fitting. It is a perspective view of other embodiment of a connection member and a metal fitting. It is a perspective view of other embodiment of a connection member. It is a perspective view of other embodiment of a connection member. It is a perspective view of other embodiment of a connection member and a metal fitting. It is a perspective view of other embodiment of a connection member. It is a top view which shows the attachment aspect of the connection member of FIG. It is a top view of this connection member shown by the dimension of the length direction and width direction of a connection member. It is a top view which shows the attachment aspect by the anchor reinforcement to the segment main body of the box-shaped joining metal fitting of FIG. It is a top view which shows the attachment aspect by the anchor reinforcement to the segment main body of the H-shaped joining metal fitting of FIG. It is a top view which shows the attachment aspect by the anchor reinforcement to the segment main body of the C-shaped joining metal fitting of FIG. It is a top view which shows the attachment aspect to the segment main body of the = shape joining metal fitting which uses C-shaped steel. It is a top view which shows the attachment aspect by the anchor reinforcement to the segment main body of the = shape joining metal fitting which uses the steel plate shown in FIG. It is a top view which shows the attachment aspect to the segment main body of the steel plate joining metal fitting shown in FIG. It is a top view which shows the reinforcement structure of the segment main beam which attaches a box-shaped joining metal fitting. It is a perspective view which shows the reinforcement structure of the segment main beam which attaches a box-shaped joining metal fitting.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main girder 2 Connecting member 2a Hollow box-shaped connecting member 2b C-shaped connecting member with male joint 2c C-shaped connecting member 2d H-shaped connecting member 2e Connecting member 2f Steel plate connecting member 3 Segment 3a Segment main body 4 Leading ring 5 Trailing ring 6 Bonding metal 6a Box-shaped bonding metal 6b H-shaped bonding metal 6c C-shaped bonding metal 6d Box-shaped bonding metal 6e Bonding metal 6f Steel plate bonding metal 7 Recessed part 8 Gap 9 One-way insertion type male member 10 One-way insertion type female member 11 Bolt 12 Bolt insertion hole 13 Female screw hole 14 Cover plate 17 Connecting plate 18 Mounting plate 19 Flange of hollow box-shaped connecting member or C-shaped connecting member 20 Web of hollow box-shaped connecting member or C-shaped connecting member 21 Rear surface of steel plate joint metal Cavity 22 Flange of H-shaped joint metal 23 Web of H-shaped joint metal 24 C Hardware 30 gusset plate for forming a flange 25 C shape joining hardware web 27 joint plate 28 Anchors 29 cavity of Jo junction fittings
31 Flange of box-shaped joint hardware 32 Insertion hole 33 Angle-shaped hardware 34 Web of box-shaped joint hardware

Claims (7)

In a segment connection structure in a structure in which segment members are connected in the tunnel circumferential direction and the axial direction using joint members, the engagement parts with the connection members are exposed to the outside on both sides of the segment width direction as joint members between segments. While fixing the bonded metal fittings,
A connecting member that has a connecting function between the segments and has a hollow box shape in which the joint surface surrounded by the flange and the web opens to the joint portion side with the joint hardware,
While arranging the connecting member on the joint side of the preceding ring and the succeeding ring across the segments adjacent in the circumferential direction,
The inner surface is in contact with the outer surface of the joint fitting provided in each segment, and the connecting member is connected so as to cover it,
The connecting structure of segments, wherein a size from an outer surface of the upper flange to an outer surface of the lower flange of the connecting member is substantially the same as a digit height of the segment.   The segment connecting structure according to claim 1, wherein the connecting member is attached so that an inner surface thereof contacts an outer surface of a metal joint having a box shape, a C shape, or an H shape, and covers the outer surface. In a segment connection structure in a structure in which segment members are connected in the tunnel circumferential direction and the axial direction using joint members, the engagement parts with the connection members are exposed to the outside on both sides of the segment width direction as joint members between segments. While fixing the bonded metal fittings,
A connecting function between the segments, a C-shaped member having a flange and a web, or two upper and lower steel plates apart air only consists substantially be parallel to, at the joining hardware to each other bolt Providing a connecting member to be fastened ;
While arranging the connecting member on the joint side of the preceding ring and the succeeding ring across the segments adjacent in the circumferential direction,
The inner surface is in contact with the outer surface of the joint fitting provided in each segment, and the connecting member is connected so as to cover it,
The connecting structure of segments, wherein a size from an outer surface of the upper flange to an outer surface of the lower flange of the connecting member is substantially the same as a digit height of the segment.   The cross-sectional secondary moment with the segment body girder centerline of the connecting member as an axis is approximately ½ or more of the cross-sectional secondary moment of the segment main body. The connection structure of the segments described in the item   The segment connecting structure according to any one of claims 1 to 4, wherein the connecting member and the joint hardware are connected by a bolt or a one-way insertion type joint.   The segment connecting structure according to any one of claims 1 to 5, wherein the connecting member and the segment attached to the connecting member are joined to each other by welding or friction joining.   The segment connecting structure according to any one of claims 1 to 6, wherein the connecting member and / or the metal joint is made of a shape steel.

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