JP6179863B2 - Segment joint structure - Google Patents

Description

  The present invention relates to a joint structure of a segment for joining a segment used for inner lining of a tunnel, in particular, between a key segment and a B segment.

  In tunnel construction using the shield method, a segment ring is assembled by connecting arc-shaped segments in the circumferential direction along the inner peripheral surface of the excavation hole on the rear side of the shield excavator, and a jack reaction force is applied to the end surface of this segment ring. After the shield excavator is advanced while removing the jack, the jack is shrunk and a new segment ring is continuously provided in the tunnel axis direction, so that the tunnel is sequentially lined.

  As shown in FIG. 12, the segment ring is formed by sequentially connecting arc-shaped normal segments (hereinafter referred to as A segments) 1, 1... In the circumferential direction, and then at one end in the circumferential direction at both ends in the circumferential direction. Are assembled by joining segments (hereinafter referred to as B segments) 2 and 2 having an inclined surface in the segment axial direction, and incorporating the key segment 3 between the B segments 2 and 2 from the face side.

  The key segment 3 and the B segment 2 are generally joined in the circumferential direction by bolts. For the purpose of shortening the construction period, reducing cost, and supporting automatic assembly, for example, cone Connector-type joint structures, hook-type joints, and the like have been developed (see, for example, Patent Document 1 and Patent Document 2).

  In the cone connector type joint structure, a segment including a male side joint member that protrudes from a circumferential joint end surface of one segment, and a female side joint member that is disposed in a recess opened in the other joint end surface An inter-joint is used, the male-side joint member is inserted into the recess, and the segments are slid relative to each other in the axial direction of the segment, so that the male-female-side joint members are engaged with each other to join the segments. It is like that.

  The male joint member includes a truncated cone-shaped male engagement portion that decreases in diameter from the face side toward the resisting side, and a support portion that protrudes from the joining end surface of the segment and supports the male engagement portion integrally. The female joint member includes a female-side engagement portion having a truncated cone-shaped fitting hole whose inner diameter is reduced from the face side toward the resistance side, and the male-side engagement is performed as the segment slides. The segments are inserted into the fitting holes, and the male-side engaging portion is fitted to the female-side engaging portion in a wedge shape, so that both segments are joined in a state where the joining surfaces are attracted to each other. .

  In addition, an inter-ring joint comprising a pin-shaped male ring joint member protruding from one joint end face and a female ring joint member embedded in the other joint end is used for joining the segment rings. The male and female ring joint members are engaged by inserting the male ring joint member into the female ring joint member, and each segment is joined in the segment axial direction by connecting the male and female ring joint members. .

JP 2009-019460 A JP 2007-056555 A

  However, when assembling a new segment ring, the jack supporting the face side end face of the key segment is removed, so that both the B segments are applied to the key segment by the compressive force acting on the segment ring in the circumferential direction. The force in the direction of being pushed out to the face side by being pressed by the joining end face of is applied.

  On the other hand, the cone connector type or cotter type inter-segment joint has a structure in which the male and female joint members are fitted in a wedge shape with the sliding movement of the key segment with respect to the B segment. If it is high, the insertion resistance force in the segment axial direction with respect to the key segment will increase, and there is a possibility that the insertion between both B segments may be hindered. It was formed with a margin so that the key segment could be inserted reliably.

  Therefore, in the conventional cone connector type or cotter type inter-segment joint, due to its structure, it cannot resist the force in the pull-out direction as described above, and therefore, the key segment and the existing segment ring are caused by the force in the pull-out direction. There is a possibility that a great load is generated in the joint between rings connecting the two.

  On the other hand, with respect to the above problems, conventionally, as shown in FIG. 12, a bar 5 such as a tie rod is bridged between the key segment 3 and the existing segment 2 adjacent in the segment axial direction. 5 is used to counteract the force in the pushing direction acting on the key segment 3 and to remove the tie rod 5 after completion of the assembly of the new segment ring. In such a method, a bar material 5 such as a tie rod is installed. In addition, there is a problem that it takes a lot of work to remove.

  Therefore, in view of such a conventional problem, the present invention mainly joins a key segment and a B segment, and can also suitably cope with a pull-out force acting on the key segment. It was made for the purpose of providing a structure.

In order to solve the conventional problems as described above and achieve the intended object, the feature of the invention described in claim 1 is that arc segment-like segments joined together in the circumferential direction constituting an annular segment ring. Between the male joint member projecting from one joint end face and a recess formed in the other joint end face part, one end side in the segment axial direction according to the relative movement of the two segments in the segment axial direction And a female joint member having a female-side engagement portion into which the male joint member is fitted, and the male joint member is inserted into the fitting hole of the female-side engagement portion from the segment axial direction. A male side engaging portion that engages with the inner side surface portion and restricts movement in a direction in which the two segments are separated from each other in the circumferential direction, the male joint member is inserted into the concave portion, and the two segments are mutually segmented. Axial In the segment joint part structure in which both the male and male joint members are connected to each other in the circumferential direction by joining the male and female joint members in the insertion direction of the male side engaging part. A rod-shaped pull-out male joint body that protrudes more integrally and a pull-out that is disposed at the back end in the insertion direction of the female-side engagement portion and is inserted in the segment axial direction. And a male joint body for preventing slipping is provided on the female joint body for preventing slipping out by fitting the male side engaging portion into the fitting hole. It is in the joint structure of the segment that is held so that it cannot be pulled out.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect, the female joint body for prevention of withdrawal includes a cylindrical outer shell portion that is continuously arranged with the female joint member in the segment axial direction. A plurality of gripping members that are movably accommodated in the outer shell portion and take a reaction force on the inner side surface of the outer shell portion to grip the pull-out prevention male joint body, and the pull-out prevention male joint And an elastic member that urges the body toward the position where the body is gripped.

  According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, the male engagement portion is formed in a truncated cone shape whose outer diameter is reduced in the sliding movement direction. The female joint member is integrally supported by a support portion protruding from the joining end surface of the one segment, and the female joint member has a truncated cone-shaped fitting hole whose inner diameter is reduced in the sliding movement direction, and the fitting hole And a support portion insertion groove directed in the segment axial direction that is open to the joint surface side in a communication arrangement, and with the relative movement of the two segments, the male side engagement portion is inserted into the fitting hole, The male end engaging portion is fitted into the fitting hole in a wedge shape, whereby the both joint end faces are attracted to each other.

  According to a fourth aspect of the present invention, in addition to the configuration of the first to third aspects, the segment includes inclined surfaces inclined in the segment axial direction at both circumferential ends, and between a pair of segments constituting the segment ring. The key segment is inserted in the segment axis direction.

The segment joint structure according to the present invention includes, as described above, a male joint member that protrudes from one joining end surface between arcuate plate-like segments that are joined together in the circumferential direction to form an annular segment ring. A female-side engagement that is disposed in a recess formed in the other joining end surface portion and is fitted with the male joint member from one end side in the segment axial direction in accordance with the relative movement of the two segments in the segment axial direction. A female joint member having a portion, wherein the male joint member is inserted into the fitting hole of the female side engaging portion from the segment axial direction and is engaged with the inner side surface portion thereof, so that both the segments are surrounded. Comprising a male side engaging part that regulates movement in a direction away from each other in the direction, inserting the male joint member into the recess, and moving both segments relative to each other in the segment axial direction, In the joint structure of a segment in which both male and female joint members are connected and both adjacent segments in the circumferential direction are joined, a rod-like pull-out projecting integrally from the rear end surface in the insertion direction of the male engagement portion A male joint body for preventing, and a female joint body for preventing slipping, which is disposed at the end in the insertion direction of the female side engaging portion and into which the male joint body for preventing slipping is inserted in the segment axial direction. A pull-out prevention joint is provided, and the male-side engaging portion is fitted into the fitting hole so that the pull-out prevention female joint body is held by the pull-out prevention female joint body so as not to be pulled out. As a result, the segments can be firmly connected in the circumferential direction, and even a joint portion that connects the circumferential directions of the segments can counter the force acting in the segment axial direction.

  According to the present invention, the female joint body for preventing slipping is accommodated in a cylindrical outer shell portion that is continuous with the female joint member in the segment axial direction, and is movably accommodated in the outer shell portion. A plurality of gripping members for gripping the pull-out prevention male joint body by taking a reaction force on the inner surface of the shell, and an elastic member for biasing the gripping member toward a position side for gripping the pull-out prevention male joint body; The male joint body for preventing slipping out can be easily inserted, and the male joint body for preventing slipping out can be moved in the pulling out direction with the gripping member taking a reaction force against the inner surface of the outer shell. Can resist.

  Further, in the present invention, the male engagement portion is formed in a truncated cone shape whose outer diameter is reduced in the sliding movement direction, and is integrally formed with a support portion protruding from the joining end surface of the one segment. The female joint member is supported and has a frustoconical fitting hole whose inner diameter is reduced in the slide movement direction, and a segment axial direction that opens to the joint surface side in communication with the fitting hole. The male side engaging portion is inserted into the fitting hole and the male side engaging portion is fitted into the fitting hole in a wedge shape with relative movement of the two segments. Thus, since both the joint end faces are attracted to each other, it is possible to counter the force in the pull-out direction corresponding to such a cone connector type joint.

  Further, in the present invention, the segment is a key segment that includes inclined surfaces inclined in the segment axial direction at both ends in the circumferential direction, and is a key segment that is inserted between the pair of segments constituting the segment ring in the segment axial direction. When a compressive force acts on the ring in the circumferential direction and is pressed against the joint end surface of the B segment, and a force in the pull-out direction acts on the key segment, the force in the pull-out direction is dispersed and counteracted at the joint portion between segments. This reduces the burden on the ring joint and eliminates the need for a rod material such as a tie rod, thereby reducing the work period and cost.

It is an expanded view which shows the segment ring which uses the joint part structure of the segment which concerns on this invention. It is a cross-sectional view which shows the joint part structure between the key segment-B segment in FIG. It is an AA line sectional view same as the above. (A) is a cross-sectional view showing the male joint member portion of the above, (b) is a cross-sectional view taken along the line BB. (A) is a cross-sectional view showing the female joint member part of the above, (b) is a side view, (c) is a cross-sectional view taken along the line CC. It is a cross-sectional view which shows the state of the male and female joint member for pull-out prevention same as the above, (a) is the state before joining, (b) is the figure which shows the joined state. It is the DD sectional view taken on the line which shows another example of the joint part structure of the segment which concerns on this invention. It is an EE sectional view taken on the line. It is a FF line sectional view same as the above. (A) is a cross-sectional view showing the male joint member portion of the above, (b) is a side view, (c) is a rear view. (A) is a GG line sectional view showing the female joint member part same as the above, (b) is the same side view, (c) is the HH line sectional view. It is an expanded view of the segment ring for demonstrating the relationship of the key segment-B segment same as the above, and the state of force which acts on a key segment.

  Next, an embodiment of the segment joint structure according to the present invention will be described based on the embodiment shown in FIGS.

  In addition, the same code | symbol is attached | subjected and demonstrated to the structure similar to the above-mentioned prior art example, and the code | symbol 1 in a figure is the arc segment shape normal segment (henceforth A segment) formed in the arc plate shape with concrete, Reference numeral 2 denotes a segment having an inclined surface 2a inclined in the segment axial direction at one end in the circumferential direction (hereinafter referred to as B segment), and reference numeral 3 denotes a key segment, which sequentially surrounds a plurality of A segments 1, 1. The B segments 2 and 2 are joined to both ends in the circumferential direction, and the key segment 3 is incorporated between the two B segments 2 and 2 in a wedge shape from one side (face side) in the segment axial direction. An annular segment ring 4 is assembled.

  In addition, after the shield excavator is advanced while the jack reaction force is applied to the end face of the existing segment ring 4, the jack is shrunk and new segment rings 4 are continuously provided in the tunnel axis direction to cover the inside of the tunnel sequentially. Work is done.

  In the following description, the circumferential direction of the segment ring 4 of each segment is defined as the segment circumferential direction, the radial direction of the segment ring 4 is defined as the segment thickness direction, and the central axis direction of the segment ring 4 is defined as the segment axial direction. The explanation will be made with the back side in the moving direction of the sliding movement of the male joint member 20 as the front.

  The key segment 3 is formed in a circular arc shape by concrete and includes inclined surfaces 3a and 3a inclined in the segment axis direction in alignment with the joining end surfaces 2a of the B segments 2 joined to both ends of the segment circumferential direction. ing.

  The key segment 3 includes a male ring joint member 12 projecting from one segment axial end surface 3b and a female ring joint member 13 embedded in the other segment axial end surface 3c portion. The male side ring joint member 12 is inserted into the female side ring joint member 13 of the segment adjacent in the direction so as not to be pulled out.

  On the other hand, the segment joint structure for joining the B segment 2 and the key segment 3 has a male joint member 20 projecting from the joining end surface 3a of the key segment 3 and the B segment 2 as shown in FIGS. And a female joint member 22 disposed in a recess 21 formed in the joint end surface portion 2a. The male joint member 20 is inserted into the recess 21 while the joint end surfaces 2a and 3a are abutted against each other. 3, the male joint member 20 is inserted into the female joint member 22 from one end side in the segment axial direction in accordance with the relative movement of the B segment 2 and the key segment 3 in the segment axial direction. The male and female joint members 20 and 22 are connected to join the key segment 3 and the B segment 2 in the circumferential direction of the segment.

  Furthermore, in the joint structure of this segment, the rod-shaped male joint body 23 for preventing withdrawal that protrudes integrally from the tip of the male joint member 20 and the female joint member 22 are prevented from coming out toward the segment axial direction at the back in the insertion direction. And a pull-out prevention female joint body 24 into which the male joint body 23 for insertion is inserted. The pull-out prevention female joint body 24 holds the male joint body 23 for pull-out prevention so as not to be pulled out. ing.

  The male joint member 20 is integrally formed of cast iron or the like, and includes a support portion 25 having a T-shaped cross section protruding from the joint end surface 3a, and a male side engagement portion 26 supported integrally at the tip of the support portion 25. The male side engaging portion 26 is inserted into the female joint member 22 with the relative movement of the segments 2 and 3 in the segment axial direction, and the male side engaging portion 26 engages with the inner side surface portion of the female joint member 22. By doing so, the movement in the direction in which the B segment 2 and the key segment 3 are separated from each other in the circumferential direction is restricted.

  The support portion 25 has its T-shaped projecting side embedded in the circumferential end portion of the segment 3 so that one end protrudes from the joint end surface 3a with its surface facing the segment thickness direction.

  In the figure, reference numeral 27 denotes a reinforcing bar embedded in the segment 3. The reinforcing bars 27 and 27 are fixed to the support portion 25 by welding or the like, and the male joint member 20 is firmly fixed to the segment 3.

  The male engagement portion 26 is formed integrally with the support portion 25 by cast iron or the like, and is formed in a truncated cone shape whose outer diameter is reduced in the direction of sliding in the segment axis direction (from the face side to the standing side). Further, a male joint body 23 for preventing slipping out is integrally provided on the rear end surface in the segment axial direction of the male side engaging portion 26.

  The pull-out prevention male joint body 23 is formed in a round bar shape, and a pull-out resistance portion having a high friction coefficient (not shown) is formed on the outer peripheral surface thereof by roughening treatment or the like.

  On the other hand, as shown in FIG. 5, the female joint member 22 is integrally formed of cast iron and the like, and is fixed to the fixed portion 28 and the fixed portion 28 having a T-shaped cross section embedded in the end of the segment 3. And a female engagement portion 29 disposed in the recess 21.

  The fixing portion 28 fixes the female side engaging portion 29 at a desired position in the concave portion 21 by embedding the T-shaped protruding side in the circumferential end portion of the segment 2.

  Reference numeral 30 in the figure denotes a reinforcing bar embedded in the segment. The reinforcing bars 30 and 30 are fixed to the fixing portion 28 by welding or the like, and the female joint member 22 is firmly fixed to the segment 2.

  The female engagement portion 29 has a frustoconical fitting hole 31 whose inner diameter is reduced in the sliding movement direction, and is directed in the axial direction of the segment that opens to the joint surface side in communication with the fitting hole 31. A support portion insertion groove 32, and with the relative movement of the segments 2 and 3, the support portion 25 is inserted into the support portion insertion groove 32 and the male engagement portion 26 is inserted into the fitting hole 31, By fitting the male side engaging portion 26 into the fitting hole 31 in a wedge shape, both the joining end surfaces 2a and 3a are attracted to each other.

  Further, the female side engaging portion 29 is provided with a female joint body 24 for preventing withdrawal at the reduced diameter side end portion of the fitting hole 31, and the male side engaging portion 26 is fitted into the fitting hole 31. The escape preventing male joint body 23 is inserted into the withdrawal preventing female joint body 24 through the insertion hole 33.

  The pull-out prevention female joint body 24 moves into the outer shell portion 34 and a cylindrical outer shell portion 34 projecting from one end (reduced diameter side end) of the female side engaging portion 29 toward the segment axis direction. A plurality of gripping members 35, 35 that can be accommodated, a rear end closing plate 36 that closes the rear end opening of the outer shell portion 34, and the gripping members 35, 35 that are supported by the rear end closing plate 36 close to each other And an elastic member 37 that is pushed in the direction in which it is inserted, and the inserted male joint body for preventing withdrawal 23 is held by gripping members 35 and 35 so that it cannot be pulled out.

  The outer shell portion 34 is formed in a cylindrical shape having a female end engaging portion 29 side closed by a front end closing portion 38 and a rear end side opened, and a male joint body 23 for preventing slipping is inserted in the center of the front end closing portion 38. An insertion hole 33 is formed.

  The grip members 35, 35 are formed in a shape that divides the conical plate shape into two in the diametrical direction, and includes a grip portion 39 that comes into contact with the outer peripheral surface of the male joint body 23 for preventing withdrawal at the center side end. Is provided with a reaction force receiving portion 40 that comes into contact with the inner surface of the outer shell portion 34, and is accommodated in the outer shell portion 34 in a symmetrical arrangement with the gripping portion 39 sides facing each other, and a position for gripping the pull-out preventing male joint body 23. And a position where the male joint body 23 is detached from the pull-out preventing male joint body 23, and the male joint body 23 for preventing slip-out inserted into the female joint body 24 for preventing pull-out is gripped.

  Further, the gripping members 35, 35 are arranged so that the insertion / extraction direction position of the gripping portion 39 is arranged on the back side in the insertion direction from the insertion / extraction direction position of the reaction force receiving portion 40 when the male joint body 23 for preventing withdrawal is gripped. Is formed.

  That is, the gripping members 35, 35 connect the center position of the reaction force received by the gripping portion 39 from the male joint body 23 for preventing the pull-out and the center position of the reaction force received by the reaction force receiving portion 40 from the outer shell portion 34. The wire and the stop shaft of the pull-out prevention male joint body 23 are formed to have a desired inclination, and when the pull-out prevention male joint body 23 is inserted into the pull-out prevention female joint body 24, the pull-out prevention Both gripping members 35, 35 are pushed and spread on the male joint body 23 and can be easily inserted. When a force in the pulling-out direction acts on the male joint body 23 for pulling out, both the gripping members 35, 35 become the outer shell portion. A reaction force is applied to 34 to firmly hold the male joint body 23 for preventing it from coming out.

  The grip portion 39 is formed in a shape in which one end of the grip members 35, 35 is recessed in an arc shape in accordance with the outer peripheral surface shape of the pull-out prevention male joint body 23, and the pull-out prevention male joint body 23 is pulled out. When inserted into the female joint body 24 for prevention, the male joint body 23 for preventing withdrawal is fitted between the gripping portions 39, 39, and the inner surface of the gripping portion 39 is mutually connected to the outer surface of the male joint body 23 for preventing slippage. It comes to contact.

  An extraction resistance portion (not shown) for opposing the force in the insertion / extraction direction is formed on the inner side surface portion of the grip portion 39, and the extraction resistance portion is pulled out by being subjected to a process such as a rough surface treatment. A high resistance force due to friction is generated between the outer surface of the male joint body 23 for prevention.

  On the other hand, the reaction force receiving portion 40 is formed in an arc shape parallel to the central axis of the grip portion 39, and when the withdrawal preventing male joint body 23 is inserted into the withdrawal preventing female joint body 24, The gripping members 35, 35 are in contact with the inner peripheral surface, and take the reaction force on the inner peripheral surface of the outer shell portion 34 to grip the pull-out preventing male joint body 23.

  The elastic member 37 uses, for example, a leaf spring having an arcuate portion that is wound inwardly at the upper and lower ends of an elastic metal plate material, and this leaf spring is disposed on the back side in the insertion direction in the outer shell portion 34. The gripping members 35, 35 are pushed into the front end closing portion 38 side by the elasticity of the spring supported by the rear end rear end closing plate 36.

  Then, when the male joint body 23 for preventing withdrawal is not inserted, the gripping members 35, 35 are pressed by the elastic member 37 toward the front end closing portion 38 side. As shown in FIG. 6 (a), when the holding joint 39 side is held in contact with each other and the withdrawal preventing male joint body 23 is inserted into the withdrawal preventing female joint body 24, the elastic force of the elastic member 37 is reduced. While resisting, they rotate in directions away from each other, and the male joint body 23 for preventing slipping is gripped between the gripping members 35 and 35.

  In the state where the pull-out prevention male joint body 23 is gripped between the gripping members 35, 35, as shown in FIG. 6B, when a pull-out force acts on the pull-out prevention male joint body 23, By forming the grip portion 39 in the insertion / extraction direction position so as to be located further in the insertion direction than the insertion / extraction direction position of the reaction force receiving portion 40, a shearing force acts on both grip members 35, 35 in the insertion / extraction direction, A compressive force acts in the direction between the grip portion 39 and the reaction force receiving portion 40.

  Accordingly, a reaction force acts in the tightening direction on the male joint body 23 for preventing withdrawal from being held by the holding members 35, 35, one end of which is supported by the outer shell portion 34, via the holding portion 39, and is firmly held. Therefore, the pull-out prevention male joint body 23 is held by the pull-out prevention female joint body 24 so as not to be pulled out.

  In the joint structure of the segment configured as described above, when the key segment 3 is assembled between the B segments 2 and 2 from one side (face side) in the segment axial direction, the male joint member 20 is inserted into the recess 21. With the relative movement of the key segment 3 and the B segments 2 and 2 in the segment axial direction, the male joint member 20 is inserted into the female joint member 22 from one end side.

  At that time, the frustoconical male engagement portion 26 is inserted into the frustoconical fitting hole 31 while the outer peripheral surface of the male engagement portion 26 slides on the inner peripheral surface of the fitting hole 31. In the state where the male side engaging portion 26 and the inner peripheral surface of the fitting hole 31 are engaged with each other and the B segment 2 and the key segment 3 attract each other with the joining end surfaces 2a and 3a, the two segments are mutually connected in the circumferential direction. Movement in the direction of leaving is restricted.

  Then, when the male side engaging portion 26 is fitted into the fitting hole 31, the pull-out prevention male joint body 23 is inserted into the pull-out prevention female joint body 24 and is gripped by both the grip members 35, 35. It is held so that it cannot escape.

  Further, the male ring joint member 12 is inserted into the female ring joint member 13 of the segment constituting the existing segment ring 4, and the key segment 3 is abutted with the existing segment ring 4 at the segment axial end faces. To be joined.

  In this state, when the jack supporting the face side end face of the key segment 3 is removed and a compressive force acts on the segment ring 4 in the circumferential direction, the key segment 3 is pressed against the joint end face of both the B segments 2. The force in the direction to escape toward the face acts.

  At this time, since the male joint body 23 for preventing slipping is held on the female joint body 24 for preventing slipping out, the force in the pulling direction acting on the key segment 3 is applied to the inter-ring joints 12, 13 and Since the joints 23 and 24 act in a distributed manner, the burden on the inter-ring joints 12 and 13 is reduced, and the key segment 3 can be suitably prevented from coming off.

  In the above-described embodiment, an example in which the male joint for preventing withdrawal is formed in a round pin shape has been described. However, the aspect of the male joint body 23 for preventing withdrawal is not limited thereto, It may be provided with a flange-like engaging portion that engages with the edge of the gripping portion 39 of the gripping members 35, 35 at the tip.

  Moreover, the aspect of the female joint body 24 for preventing withdrawal is not limited to the above-described embodiment, and any configuration may be used as long as the inserted rod-shaped male joint body 23 for preventing withdrawal can be held out.

  In the above-described embodiment, the male joint member 20 is provided with the truncated cone-shaped male side engaging portion 26, and the female joint member 22 is provided with the truncated cone-shaped fitting hole 31. Although the example applied to the joint member has been described, the aspect of the joint portion is not limited to this, and for example, a hook-type segment joint portion structure as shown in FIGS. In addition, the same code | symbol is attached | subjected and demonstrated to the structure similar to the above-mentioned Example.

  The joint structure of this segment includes a male joint member 50 protruding from one joint end face 3a to be joined to each other, and a female joint member 52 disposed in a recess 51 formed in the other joint end face 2a. The joint end surfaces 2a and 3a are butted against each other, the male joint member 50 is inserted into the recess 51, and both the segments 2 and 3 are moved relative to each other in the segment axial direction. In accordance with the relative movement in the segment axial direction, the male joint member 50 is inserted into the female joint member 52 from one end side in the segment axial direction to connect the male and female joint members 50, 52, and the key segment 3 and the B segment 2 are segmented. It is made to join in the circumferential direction.

  As shown in FIG. 10, the male joint member 50 has a flat male joint member body in which one end is embedded in the circumferential end portion of the segment 3 and the other end protrudes from the joining end surface 3 a with the surface facing the segment thickness direction. 53, and male engagement members 54 and 54 that project from both surfaces of the male joint member main body 53 toward the segment axial direction.

  The male joint member main body 53 is formed in a rectangular flat plate shape with cast iron and the like, and the longitudinal direction thereof is arranged in the circumferential direction of the segment and the surface thereof is arranged in the segment thickness direction. The other end protrudes from the joining end surface 3a with its surface facing the segment thickness direction.

  The male side engaging portions 54, 54 are formed in a shape having a continuous rectangular cross section with a rigid material such as cast iron steel, and at a position spaced apart from the joint end surface 3a on the surface of the male joint member main body 53 by a predetermined distance. It is firmly fixed by welding with its longitudinal direction directed to the segment axial direction.

  Further, the male side engaging portions 54, 54 are arranged such that the front end side in the segment axial direction is inclined toward the back side in accordance with the inner surface shape of the female joint member 52.

  Further, the male joint member main body 53 is integrally provided with a round bar-shaped or flat bar-shaped male joint body for preventing withdrawal, which protrudes in the segment axial direction.

  On the other hand, as shown in FIG. 11, the female joint member 52 is fixed at a position offset in the segment axial direction in the recess 51 formed at the circumferential end of the segment.

  The female joint member 52 includes a main body portion 61 having a pair of support plate portions 60, 60 facing each other at intervals in the segment thickness direction, and a pair of female members protruding from the inner side surface portions of the support plate portions 60, 60. Side engagement portions 62 and 62 are provided.

  The female joint member 52 includes a rear end plate 63 disposed at the rear end of the recess 51 in the segment axial direction.

  The main body portion 61 includes a pair of support plate portions 60, 60 that are spaced apart from each other, a connecting plate 64 that is disposed so as to span between the support plate portions 60, 60, and a rear end side. And a rear end plate 63 that is disposed, is formed in a hollow shape by the connecting plate 64, the rear end plate 63, and the two support plate portions 60, 60, and is formed in the concave portion 51 outside the connection plate 64 and the two support plate portions 60, 60. The side surfaces are fitted to the inner side surfaces of the recess 51 so as to face each other.

  A plurality of anchor members 65 embedded in the segments are provided outside the respective support plate portions 60, 60 in parallel arrangement with intervals in the segment axial direction, and the end portions of the support plate portions 60, 60 are welded. The female joint member 52 is fixed to the segment 2 via the anchor member 65.

  Each female side engaging part 62 protrudes from the mutually opposing inner surface of each support plate part 60, 60, and between the female engaging parts 62, 62 as both segments 2, 3 move relative to each other. While the male joint member main body 53 is inserted, the male side engaging portions 54, 54 move relative to the female side engaging portions 62, 62, and the male side engaging portion 54 is located inside the female side engaging portion 62. The movement in the direction in which the segments 2 and 3 are separated from each other in the circumferential direction is restricted in a state where the B segment 2 and the key segment 3 are engaged with each other in a wedge shape and are brought into contact with each other by attracting the joining end faces 2a and 3a.

  Further, a female joint body 66 for preventing withdrawal is provided at the back side of the female joint member 52, and this female joint body for preventing withdrawal is associated with the relative movement of the key segment 3 and the B segment 2 in the segment axial direction. A male joint body 55 for preventing withdrawal is inserted into 66 so that it cannot be pulled out.

  The escape prevention female joint body 66 is formed with a hollow box-shaped outer shell portion surrounded by the support plate portions 60, 60, the rear end plate 63 and the partition member 67 partitioned by the partition member 67. A pair of gripping members 69 and 69 having a parallelogram shape in cross section and an elastic member 70 that is supported by the rear end plate 63 and presses the gripping members 69 and 69 are accommodated in the outer shell portion. ing.

  Further, both gripping members 69 and 69 are accommodated in the outer shell part so as to be movable between a position for gripping the pull-out prevention male joint body 55 and a position for separating from the pull-out prevention male joint body 55, and an elastic member. 70 is biased toward the position where the male joint body 55 for preventing withdrawal is gripped.

  When the pull-out preventing male joint body 55 is inserted into the pull-out preventing female joint body 66, both the gripping members 69 and 69 are rotated in directions away from each other while resisting the elastic force of the elastic member 70. The pull-out preventing male joint body 55 is gripped between the gripping members 69 and 69 so as not to be pulled out.

  In the above-described embodiment, the example in which the joint structure of the segment according to the present invention is applied to the joint between the B segment 2 and the key segment 3 has been described. However, between the A segment 1 or between the A segment 1 and the B segment 2 You may apply to joining of.

DESCRIPTION OF SYMBOLS 1 A segment 2 B segment 3 Key segment 4 Segment ring 12 Male ring joint member 13 Female ring joint member 20 Male joint member 21 Recess 22 Female joint member 23 Pull-out prevention male joint body 24 Pull-out prevention female joint body 25 Support Part 26 male side engaging part 27 reinforcing bar 28 fixing part 29 female side engaging part 30 reinforcing bar 31 fitting hole 32 support part insertion groove 33 insertion hole 34 outer shell part 35 holding member 36 rear end closing plate 37 elastic member 38 front end closing Portion 39 Grasping portion 40 Reaction force receiving portion 50 Male joint member 51 Recessed portion 52 Female joint member 53 Male joint member main body 54 Male side engaging portion 55 Pull-out preventing male joint body 60 Support plate portion 61 Main body portion 62 Female side engaging portion 63 Rear end plate 64 Connecting plate 65 Anchor member 66 Female joint body 67 for preventing pull-out Partition member 69 Holding member 70 Elastic member

Claims (4)

Between the arc-shaped segments that are joined together in the circumferential direction constituting the annular segment ring, the male joint member that protrudes from one joining end face, and the concave joint formed in the other joining end face part, A female joint member having a female-side engaging portion into which the male joint member is fitted from one end side in the segment axial direction in accordance with the relative movement in the segment axial direction of the two segments;
The male joint member is inserted into the fitting hole of the female side engaging portion from the segment axial direction and engages with the inner side surface portion thereof, and the movement in the direction in which the two segments are separated from each other in the circumferential direction is restricted. A male side engaging portion,
A segment in which the male and female joint members are connected by joining the male and female joint members by inserting the male joint member into the recess and moving the segments relative to each other in the segment axial direction. In the joint structure of
A rod-shaped pull-out preventing male joint integrally projecting from the back end face in the insertion direction of the male engagement portion, and the pull-out prevention male joint disposed at the back end in the insertion direction of the female engagement portion. The body is provided with a pull-out prevention joint consisting of a female joint body for slip-out prevention inserted into the segment axial direction,
The segment characterized in that the male joint body for prevention of withdrawal is held in the female joint body for prevention of withdrawal so that the male joint body for prevention of withdrawal cannot be pulled out by being fitted into the fitting hole. Joint part structure.   The female joint body for preventing slipping is accommodated in a cylindrical outer shell portion that is continuous with the female joint member in the segment axial direction, and is movably accommodated in the outer shell portion, on the inner surface of the outer shell portion. 2. A plurality of gripping members that take a reaction force to grip the pull-out prevention male joint body, and an elastic member that urges the gripping member toward a position for gripping the pull-out prevention male joint body. The joint structure of the segment described in 1. The male engagement portion is formed in a truncated cone shape whose outer diameter is reduced in the moving direction, and is integrally supported by a support portion protruding from the joining end surface of the one segment,
The female joint member includes a frustoconical fitting hole whose inner diameter is reduced in the sliding movement direction, and a support portion oriented in the segment axial direction that is open to the joint surface in communication with the fitting hole. With an insertion groove,
As the two segments move relative to each other, the male side engaging portion is inserted into the fitting hole, and the male side engaging portion is fitted into the fitting hole in a wedge shape. The joint structure of a segment according to claim 1 or 2, which is attracted.   4. The key segment according to claim 1, wherein the segment is a key segment that includes inclined surfaces that are inclined in the segment axial direction at both ends in the circumferential direction, and that is inserted between the pair of segments constituting the segment ring in the segment axial direction. The joint structure of the segment described in 1.

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