JP2015048656A - Joint part structure of segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive joint part structure of a segment, reliably insertable by small insertion force, and capable of reliably connecting the mutual segments.SOLUTION: The joint part structure of a segment comprises a female side joint member 4 having: an outer shell body 12 of closing the front end side by a front end plate 10 and closing the rear end side by a rear end plate 11; a plurality of movable reaction transmission members 13 and 13 forming a cylindrical body having an inner wedge fitting part 17 of a tapered hole shape in a shape of being divided plurally and movably fitted in the outer shell body 12; a plurality of inner wedge members 14 and 14 for forming a wedge-shaped body having an outside surface of a tapered shape of expansively opening toward the rear end side fitted to the inner wedge fitting part 17, in a shape of being divided plurally; and a spring body 15 for biasing the inner wedge members 14 and 14 to the joining surface side by taking reaction to the rear end plate 11. A male side joint member 3 is held by the female side joint member 4 so as not to skip out.

Description

  The present invention relates to a segment joint structure for interconnecting segments used for tunnel inner lining, and more particularly to segment segments for interconnecting segment rings.

  In tunnel construction by 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 this segment ring is advanced by the shield excavator. The tunnel is lined up by connecting the tunnels in the direction of the tunnel axis.

  Conventionally, the segment rings are connected to each other by connecting the segments constituting the segment ring in the tunnel axis direction, and the joint structure connecting the segments to each other is connected to one of the segments connected to each other. A pin-like male joint member projecting from the joint end face, and a female joint member member fixed to the joint portion of the other segment; A structure is known in which segments are connected to each other by inserting the female side joint member into the female side joint member and holding the male side joint member so that it cannot be pulled out.

  In such a joint portion structure, a pin-shaped male side joint member is press-fitted into the female side joint member, and is connected so as to be immovable in the ring axis direction by the pulling resistance force (for example, Patent Document 1). Or an engagement piece movable in the axial direction of the male joint member in the female joint member, and when the male joint member is inserted into the female joint member, the engagement piece There is one that engages with an engaging groove formed on the outer peripheral portion of a member by a biasing force of a spring to restrict the axial movement of the pin (for example, Patent Document 2).

  Further, as shown in FIG. 7, the conventional joint portion structure has an outer shell body 101 having a tapered cylindrical main body portion 100 whose diameter is reduced toward the joint surface side, and is fitted into the outer shell body 101. Reaction force that urges each wedge member 102, 102 to the joint surface side by applying reaction force to the plurality of wedge members 102, 102 having a shape obtained by dividing the truncated cone shape into a plurality and the rear end plate 103 of the outer shell body 101. By using the female side joint member 106 provided with the spring 105 and gripping the male side joint member 107 with the wedge members 102, 102, the male side joint member 107 is made to hold the male side joint member 107 so as not to be pulled out. What has been developed has also been developed (see, for example, Patent Document 3 and FIG. 9).

Japanese Patent Laid-Open No. 2000-28295 JP 2003-328893 A JP 2008-156997 A

  However, in the conventional technique as shown in Patent Document 1 described above, a pin-shaped male side joint member is press-fitted into the female side joint member, and the connection strength is ensured by the pull-out resistance force. There was a problem that an insertion force was required and work efficiency was poor.

  Further, the conventional technique as shown in the above-mentioned Patent Document 2 has a problem that the cost increases because the number of parts is large and the structure is complicated.

  Further, in the conventional technique as shown in Patent Document 3 described above, each wedge body is urged by applying a reaction force to the rear end plate of the outer shell body fixed to the segment, and the tapered inner surface of the outer shell body is urged. Since the wedge body is always in the state of gripping the male joint member due to the reaction force from the outer shell body, the wedge body tightening and reaction force taking the reaction force against the outer shell body It had to be inserted against the biasing force of the spring, and a high insertion force was required.

  On the other hand, if the urging force by the reaction force spring is weak, the reaction force spring may be destroyed in the insertion work of the male side joint member. There was a possibility that it could not be held.

  Therefore, in view of such a conventional problem, the present invention has an object to provide an inexpensive segment joint structure that can be reliably inserted with a small insertion force and can be reliably connected to each other. It was made as.

  The feature of the invention according to claim 1 for solving the conventional problem as described above is that the pin-shaped male joint member protruding from the joint end surface of one segment connected to each other and the joint of the other segment A female-side joint member fixed to a portion, the end surfaces of the joint portions are butted together, the male-side joint member is inserted into the female-side joint member, and the male-side joint member is pulled out of the female-side joint member. In the joint structure of the segment in which both the segments are connected by being held impossible, the female side joint member is closed with a front end plate having an opening on the front end side, and a rear end plate on the rear end side. A closed cylindrical outer shell body and a cylindrical body having a tapered hole-shaped inner wedge fitting portion that is widened toward the rear end side at the center are formed into a plurality of divided shapes, and the outer shell body Multiple moveable mated to A plurality of inner wedge members formed into a shape obtained by dividing a force transmission member and a wedge-shaped body having a tapered outer surface that is widened toward the rear end side that is fitted to the inner wedge fitting portion; A spring body that takes a reaction force on the rear end plate and urges the inner wedge member toward the joint surface, and that takes the reaction force on the outer shell body via the movable reaction force transmission member. The male joint member is held by a wedge member so that the male joint member is held by the female joint member so that the male joint member cannot be pulled out.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect, the movable reaction force transmitting member is formed such that the length in the insertion / extraction direction is shorter than the distance between the front and rear end plates, and the male side coupling member is inserted / extracted It is to be able to move in the outer shell body in the direction.

  According to a third aspect of the present invention, in addition to the structure of the first or second aspect, the tapered fitting surfaces of the inner wedge fitting portion and the inner wedge member that are fitted to each other have smooth low friction. It is to become a face.

  According to a fourth aspect of the present invention, in addition to the configuration of any one of the first to third aspects, the male side joint member is provided on the outer surface of the male side joint member and / or the gripping surface of the inner wedge member. This is because an extraction resistance portion is formed to counteract the force in the extraction direction.

  As described above, the joint structure of the segment according to the present invention includes a pin-like male joint member protruding from the joint end face of one of the segments connected to each other and a female fixed to the joint of the other segment. A side joint member, but abutting the end surfaces of both joints, inserting the male side joint member into the female side joint member, and causing the female side joint member to hold the male side joint member so that it cannot be pulled out. In the joint structure of the segment formed by connecting both the segments, the female joint member has a cylindrical shape in which a front end side is closed with a front end plate having an opening and a rear end side is closed with a rear end plate. An outer shell and a cylindrical body having a tapered hole-shaped inner wedge fitting portion that expands toward the rear end side at the center are formed into a plurality of divided shapes, and are movably fitted into the outer shell. Multiple movable reaction force transmission parts And a plurality of inner wedge members formed in a shape obtained by dividing a wedge-shaped body having a tapered outer surface that is expanded toward the rear end side that is fitted to the inner wedge fitting portion, and the rear end A spring body that takes a reaction force on the plate and biases the inner wedge member toward the joint surface, and each inner wedge member that takes a reaction force on the outer shell body via the movable reaction force transmission member. When the male side joint member is gripped, the male side joint member is made to hold the male side joint member so that it cannot be pulled out. The member and the inner wedge member slide relative to each other, thereby reducing the gripping force on the male joint member by the inner wedge member, so that insertion can be performed with a small insertion force, and a force in the extraction direction acts on the male side joint member. In this case, each inner wedge member applies a reaction force to the outer shell body via the movable reaction force transmission member. Thus, the male joint member can be securely gripped. Moreover, since the structure is simplified, it can be manufactured at low cost.

  Further, in the present invention, the movable reaction force transmission member is formed such that the length in the insertion / extraction direction is shorter than the distance between the front and rear end plates, and the movable reaction force transmission member can move in the outer shell body in the insertion / extraction direction of the male joint member. When the insertion force acts on the male joint member, the movable reaction force transmission member and the inner wedge member can slide smoothly with respect to each other.

  Further, in the present invention, when the male side joint member is inserted by making each of the inner wedge fitting portion and the inner wedge member a tapered fitting surface fitted to each other as a smooth low friction surface, The inner wedge member can be smoothly moved relative to the movable reaction force transmission member by being pushed by the male side coupling member.

    Further, in the present invention, an extraction resistance portion is formed on the outer surface of the male side joint member and / or the holding surface of the inner wedge member to counter the force in the extraction direction acting on the male side joint member. Accordingly, a resistance force can be suitably applied between the male side joint member and the inner wedge member, and the male side joint member can be reliably held by the female side joint member.

(A) is a front view which shows an example of the segment which uses the joint part structure which concerns on this invention, (b) is the bottom view. It is a longitudinal cross-sectional view which shows an example of the joint part structure of the segment which concerns on this invention. It is the sectional view on the AA line in FIG. It is a longitudinal cross-sectional view which shows the female coupling member in FIG. (A)-(d) is a longitudinal cross-sectional view for demonstrating the connection process of the joint part structure of the segment which concerns on this invention. It is a longitudinal cross-sectional view which shows the other Example of the joint part structure of the segment which concerns on this invention. It is a longitudinal cross-sectional view which shows the joint part structure of the conventional 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 the figure, reference numeral 1 denotes a segment formed in a circular arc shape from concrete, and a plurality of segments 1, 1... Are connected in the ring circumferential direction to form an annular segment ring. The ring is lined up in the tunnel axis direction to cover the tunnel.

  The segment rings are connected to each other by connecting the segments 1, 1... Constituting each segment ring in the tunnel axis direction.

  As shown in FIGS. 2 and 3, the joint portion structure A for connecting the segments 1, 1... To each other in the ring axis direction (tunnel axis direction) is connected to the joint end surface 2a of one segment 1 connected to each other. A male-side joint member 3 that is projected and a female-side joint member 4 that is fixed to the joint end surface 2b of the other segment 1 are joined together, and the joint end surfaces 2a and 2b of both segments 1 and 1 are butted together. The side joint member 3 is inserted into the female side joint member 4 through the opening 5, and the male side joint member 3 is held in the female side joint member 4 so that it cannot be pulled out. It is designed to be impossible to connect.

  The male joint member 3 is formed in a round bar shape protruding in the ring axis direction from the joint end surface 2a at one end of the segment 1 in the ring axis direction, and is arranged at intervals in the ring circumferential direction.

  The male side joint member 3 has one end portion fixed to the reinforcing bars 6 and 6 embedded in the concrete as necessary by welding, and thereby the segment 1 in a state in which the other end portion protrudes from the joint end surface 2a. It is fixed to.

  A taper portion 3a having a chamfered tip is formed at the tip of the male joint member 3 so that the male joint member 4 can be easily inserted into the tape.

  Further, an extraction resistance portion 7 is formed on the outer peripheral surface portion of the male side joint member 3 to counter the force in the insertion / extraction direction, and the extraction resistance portion 7 is formed with an uneven surface such as a rough surface treatment or a reinforcing bar. And a high resistance force against the force in the pull-out direction can be obtained between the inner wedge members 14 and 14 to be described later.

  As shown in FIG. 4, the female joint member 4 is movable into the outer shell body 12 and the cylindrical outer shell body 12 whose inner surfaces facing each other are closed at both ends by end plates 10 and 11 and parallel to each other. The reaction force is applied to the plurality of movable reaction force transmission members 13, 13 fitted to each other, the plurality of inner wedge members 14, 14 fitted to the inside of the movable reaction force transmission members 13, 13, and the rear end plate 11. And a reaction force spring 15 for urging each inner wedge member 14, 14 toward the joint surface, and by inserting the male side joint member 3 into the female side joint member 4, the movable reaction force transmission members 13, 13 are provided. The inner wedge members 14, 14 that have taken the reaction force on the outer shell body 12 through the gripper 14 hold the male joint member 3.

  For example, the outer shell 12 is formed in a cylindrical shape with a steel pipe or the like, and the front end plate 10 and the rear end plate 11 are firmly fixed to the front and rear end portions of the cylindrical portion 16, respectively, and both end portions are closed. ing.

  The front end plate 10 has a round hole-like opening 5 penetrating in the thickness direction in the center, and the male joint member 3 is inserted into the female joint member 4 through the opening 5.

  Each of the movable reaction force transmission members 13, 13 is divided into a plurality of cylindrical shapes having a tapered hole-shaped inner wedge fitting portion 17 that is widened toward the rear end at the center by cast iron or the like (this embodiment) In the example, it is formed in a shape divided into two).

  Each movable reaction force transmission member 13, 13 has an outer peripheral surface facing the inner peripheral surface of the outer shell cylindrical portion 16 in parallel with each other, and is fitted to the inner peripheral portion of the outer shell body 12. In addition, in the state of being fitted to the inner peripheral surface of the outer shell body 12, that is, in the state in which the outer peripheral surface of each movable reaction force transmission member 13, 13 is in contact with the inner peripheral surface of the outer shell body 12. A gap is formed between the transmission members 13 and 13.

  That is, each of the movable reaction force transmission members 13 and 13 is accommodated in the outer shell 12 so as to be movable in a cylindrical shaft diameter direction, that is, in a direction to be attached to and detached from the inner peripheral surface of the outer shell 12.

  The movable reaction force transmission members 13 and 13 are formed so that the length in the insertion / removal direction is shorter than the distance between the front and rear end plates 10 and 11 and can move in the insertion / removal direction of the male joint member 3. It is housed in the body 12.

  The inner wedge fitting portion 17 is composed of a pair of fitting grooves 18 and 18 formed in inner surface portions facing each other of the movable reaction force transmission members 13 and 13, respectively, and matches the shape of the inner wedge members 14 and 14. In this way, it is widened to the rear end plate 11 side, and has a truncated cone taper shape penetrating through both front and rear ends. In addition, each fitting groove 18 has a smooth low friction surface by polishing or the like on the fitting surface with the inner wedge members 14 and 14.

  Each of the inner wedge members 14 and 14 is formed into a shape obtained by dividing a truncated cone-shaped wedge body having a tapered outer surface widened toward the rear end side into a plurality of pieces (in this embodiment, divided into two parts) in the radial direction. In a state where they are combined with each other to form a truncated cone shape, they are fitted into the inner wedge fitting portion 17 so as to be movable.

  Further, the inner wedge members 14, 14 have a tapered outer peripheral surface that is a smooth low friction surface by polishing or the like, and can smoothly move relative to the inner wedge fitting portion 17. ing.

  The inner wedge members 14, 14 are formed with a semicircular groove-shaped gripping portion 19 penetrating in the front-rear direction on the inner surface portions facing each other, and the inner joint member 3 is fitted in the gripping portion 19. The wedge members 14 and 14 are configured to grip the male joint member 3.

  Both the gripping portions 19 and 19 are formed such that a slight gap is formed between the inner wedge members 14 and 14 in a state where the male joint member 3 is fitted.

  In addition, a tapered introduction portion 19 a that expands toward the joint surface is formed at the opening edge of the front end side of each gripping portion 19.

  The reaction force spring 15 is constituted by, for example, a coil spring, takes a reaction force on the rear end plate 11 and urges the inner wedge members 14 and 14 toward the joining surface side, and further via the inner wedge members 14 and 14. The movable reaction force transmission members 13 and 13 are biased to the outside and the joining surface side.

  In the joint part structure of the segment configured as described above, when the male side joint member 3 is inserted into the female side joint member 4 through the opening 5, first, the tapered part 3a of the male side joint member 3 is moved to the inner wedge members 14, 14 abuts on the 14 introduction portions 19a.

  When the male joint member 3 is pushed further against the biasing force of the reaction force spring 15 from this state, the tapered portion 3a and the introduction portion 19a slide with each other, and the inner wedge members 14, 14 are Sliding in the inner wedge fitting portion 17 outward and toward the rear end plate 11 side, as shown in FIG. .

  In this state, the inner wedge members 14 and 14 are urged toward the joining surface by the reaction force spring 15, and accordingly, the movable reaction force transmitting members 13 and 13 are joined to the joining surface side via the inner wedge members 14 and 14. Further, when a force in the pull-out direction is applied to the male joint member 3 that is biased toward the outer peripheral side, the inner wedge members 14 and 14 engage with the movable reaction force transmission members 13 and 13 in a wedge shape, and both inner wedge members 14, 14 takes the reaction force on the inner peripheral surface of the outer shell cylindrical portion 16 and the front end plate 10 via the movable reaction force transmission members 13, 13 and grips the male side joint member 3, whereby the male side joint member The movement in the direction of exiting 3 is restricted.

  On the other hand, when an insertion force in the pushing direction acts on the male side coupling member 3, first, as shown in FIGS. 5A to 5B, the insertion force (in the insertion direction of the male side coupling member 3). The edge of the movable reaction force transmitting members 13, 13 with respect to the front end plate 10 is cut by the movement), and the rear end surfaces of the movable reaction force transmitting members 13, 13 come into contact with the rear end plate 11 of the outer shell body 12.

  Next, as shown in FIG. 5B to FIG. 5C, the movable reaction force transmission members 13, 13 take a reaction force on the rear end plate 11 in a state where the edge with the front end plate 10 is cut, In addition, since the movable reaction force transmitting members 13 and 13 and the inner wedge members 14 and 14 are slidably fitted to the outer shell body 12, the fitting surfaces slide smoothly with each other, and the insertion / extraction direction And a relative movement in a direction in which the distance between the outer peripheral surface of the movable reaction force transmission member 13 and the grip portion 19 of the inner wedge member 14 is reduced.

  Then, as the distance between the outer peripheral surface of the movable reaction force transmission member 13 and the grip portion 19 of the inner wedge member 14 becomes smaller, the force for gripping the male joint member 3 by the inner wedge members 14 and 14 decreases, so that it is small. The male joint member 3 can be inserted by the insertion force, and finally the edge of the movable reaction force transmission member 13 with respect to the inner peripheral surface of the outer shell cylindrical portion 16 is cut, and the outer peripheral surfaces of the movable reaction force transmission members 13 and 13 And a state in which a clearance c1 is instantaneously generated between the outer shell body 16 and the inner circumferential surface of the outer shell body portion 16, and a reaction force is applied to the outer shell body 12 through the movable reaction force transmission members 13 and 13. The male joint member 3 is released from the constraint of the inner wedge members 14 and 14.

  On the other hand, as both the inner wedge members 14 and 14 are pushed toward the rear end side together with the male joint member 3, the spring pressure of the reaction force spring 15 taking the reaction force on the rear end plate 11 increases, Due to the balance with the gripping force by the inner wedge members 14, 14 with respect to the male joint member 3, the inner wedge member 14, due to the spring pressure by the reaction force spring 15, simultaneously with the operation of FIGS. 5 (b) to 5 (c). 14 is pushed back to the front end side.

  At that time, the movable reaction force transmission members 13 and 13 are movably fitted in the outer shell 12 and the edges are cut from the inner peripheral surface of the outer shell cylinder portion 16 and the front end plate 10, that is, Since the inner wedge members 14 and 14 are not receiving the reaction force from the outer shell body 12 via the movable reaction force transmitting members 13 and 13, the reaction force spring 15 has a small spring pressure and both inner wedge members. The members 14, 14 can be pushed into the front end side.

  The inner wedge members 14 and 14 move relative to the male joint member 3 toward the front end side, and are pressed by the inner wedge members 14 and 14 to move the movable reaction force transmission members 13 and 13 to the front end side and the outer side. As shown in FIG. 5 (d), the inner wedge members 14, 14 are reengaged with the movable reaction force transmission members 13, 13 at the position where the male joint member 3 is inserted. A state in which the inner wedge members 14 and 14 grip the male joint member 3 by taking reaction force on the inner peripheral surface of the outer shell cylindrical portion 16 and the front end plate 10 via the movable reaction force transmitting members 13 and 13, that is, Only the male joint member 3 is in the state of having advanced to the rear end side.

  5A to 5D is repeated until the joining end surfaces 2a and 2b of the segments 1 and 1 are abutted with each other, and the male joint member 3 is connected to the female side. As shown in FIGS. 2 and 3, the male side joint member 3 and the female side joint member 4 are connected to each other by being inserted into the joint member 4.

  In the above-described embodiment, the outer shell body 12 has a cylindrical shape and the movable reaction force transmission members 13 and 13 are formed in a shape obtained by dividing the cylindrical shape into two parts. However, the outer shell body 12 and the movable reaction force have been described. The mode of the transmission members 13 and 13 is not limited to this. For example, the outer shell 12 is formed in a rectangular tube shape, and the movable reaction force transmission members 13 and 13 are formed in a shape obtained by dividing a rectangular parallelepiped shape. Also good.

  In the above-described embodiment, the example in which the inner wedge member is formed in the shape of the truncated cone is described. However, the aspect of the inner wedge member is not limited to this, and the other wedge-shaped body is divided into a plurality of shapes. There may be.

  In the above-described embodiment, the example has been described in which the movable reaction force transmission member and the inner wedge member are each formed by dividing the cylindrical body and the truncated cone-shaped wedge body into two in the diametrical direction. It is not limited, The shape divided | segmented into three or more may be sufficient.

  Furthermore, the aspect of the reaction force spring 15 is not limited to the above-described embodiment, and for example, a leaf spring may be used as shown in FIG.

A Joint part structure 1 Segment 2a, 2b Joining end face 3 Male side joint member 4 Female side joint member 5 Opening part 6 Reinforcement 7 Extraction resistance part 10 Front end plate 11 Rear end plate 12 Outer shell 13 Movable reaction force transmission member 14 Inner wedge Member 15 Reaction force spring 16 Cylindrical part 17 Inner wedge fitting part 18 Fitting groove 19 Gripping part

Claims (4)

A pin-like male joint member protruding from the joint end surface of one segment connected to each other; and a female joint member fixed to the joint portion of the other segment; A joint structure for a segment, in which a male joint member is inserted into the female joint member, and the male joint member is held in the female joint member so that the male joint member cannot be pulled out. In
The female joint member includes a cylindrical outer shell body whose front end side is closed by a front end plate having an opening, and whose rear end side is closed by a rear end plate, and a taper which is widened toward the rear end side at the center portion. A plurality of movable reaction force transmission members formed in a shape obtained by dividing a cylindrical body having a hole-shaped inner wedge fitting portion into a plurality of parts, and movably fitted in the outer shell, and the inner wedge fitting portion A plurality of inner wedge members formed in a shape obtained by dividing a wedge-shaped body having a tapered outer surface that is widened toward the rear end side to be fitted, and the inner end member taking a reaction force on the rear end plate A spring body that biases the wedge member toward the joint surface,
The male joint member cannot be pulled out of the female joint member by causing each inner wedge member that has taken a reaction force to the outer shell through the movable reaction force transmission member to grip the male joint member. A segment joint structure characterized by being held by   2. The segment according to claim 1, wherein the movable reaction force transmission member has a length in an insertion / extraction direction shorter than the distance between the front and rear end plates, and is movable in the outer shell in the insertion / extraction direction of the male joint member. Joint structure.   The joint structure of a segment according to any one of claims 1 and 2, wherein the tapered fitting surfaces of the inner wedge fitting portion and the inner wedge member that are fitted to each other are smooth low friction surfaces. The extraction resistance part for opposing the force of the extraction direction which acts on the said male side coupling member was formed in the outer surface of the said male side coupling member, and / or the holding surface of the said inner wedge member. 2. The joint structure of the segment according to claim 1.

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