JP4641012B2 - Joint for segment - Google Patents

Description

  The present invention relates to a joint for a segment, and more particularly to a joint for a segment that can join lining segments used when a tunnel is dug by a shield method with one touch.

  An example of a one-touch type joint capable of connecting segments for shield tunnel construction with one touch is disclosed in Japanese Patent Application Laid-Open No. 2003-155896. Hereinafter, this one-touch joint is referred to as a conventional joint and will be described with reference to the drawings.

  FIG. 10 is a partially cutaway perspective view showing a conventional joint before joining, FIG. 11 is a partially cutaway perspective view showing the conventional joint just before the completion of joining, and FIG. 12 is a partially cutout showing an annular elastic member of the conventional joint. It is a perspective view.

  10 to 12, reference numeral 11 denotes a rod-shaped male joint, which is formed by a front and rear constricted portions 12A and 12B formed at intervals in the axial direction, and a tapered portion formed by front and rear constricted portions 12A and 12B. It consists of tapered front and rear protrusions 13A, 13B.

  Reference numeral 14 denotes a cylindrical female joint into which the male joint 11 is inserted. The front and rear annular grooves 15A and 15B and the front and rear annular grooves 15A and 15B formed on the inner periphery of the cylindrical female joint at an interval in the axial direction. Front and rear annular elastic members 16A and 16B fitted into the front and rear annular elastic members 16A and 16B, and front and rear enlarged diameter holding members that retain the expanded diameters of the front and rear annular elastic members 16A and 16B. It consists of tools 17A and 17B. The front and rear diameter expanding holders 17A and 17B are pushed in by insertion of the male joint 11, and come out of the front and rear annular elastic members 16A and 16B. At this time, the rear diameter increasing holder 17B is fitted into the front diameter increasing holder 17A.

  As shown in FIG. 12, the front and rear annular elastic members 16 </ b> A and 16 </ b> B are divided into a plurality of annular core members 18 made of large-diameter iron wires and the like, and spring steel wound around the core members 18. It consists of a coil spring 19 composed of, for example.

  In order to couple the segments in the axial direction by the conventional joint constructed as described above, as shown in FIG. 13, the male joint 11 is projected on one axial coupling surface (S1) of the segment 20, and the projection The parts 13A and 13B are protruded and fixed, and the female joint 14 is fixed to the other axial coupling surface (S2).

  Then, as shown in FIG. 11, the male joint 11 is inserted into the female joint 14. At this time, the front projecting portion 13A of the male joint 11 pushes the rear diameter increasing holder 17B, and subsequently pushes the front diameter increasing holder 17A. At this time, the rear diameter increasing holder 17B is fitted into the front diameter increasing holder 17A. In this way, when the front and rear enlarged diameter holders 17A and 17B are disengaged from the front and rear annular elastic members 16A and 16B, the front and rear annular elastic members 16A and 16B are reduced in diameter to be in front of the female joint 14 and It fits in the rear annular grooves 15A and 15B. As a result, even if a pulling force acts on the joint portion, the annular elastic members 16A and 16B receive a shearing force, so that the male joint 11 does not come out of the female joint 14 and the segments 20 are joined together.

  Further, the constricted portion of the male joint 11 and the annular groove of the female joint 14 are provided in two stages, such as 12A, 12B, 15A, 15B, respectively, and the interval between the constricted portion of the male joint 11 and the interval between the annular grooves of the female joint 14 By providing a gap in the gap, even if a gap (opening) occurs between the segments due to manufacturing errors or construction errors, the elastic member engages with any constricted part and the annular groove to resist the tensile force. As a result, the segments can be reliably connected to each other.

JP 2003-155896 A

  According to the conventional joint, the segments 20 can be connected with one touch, but there are the following problems.

  (1) Since the front and rear diameter expanding holders 17A and 17B are held by the contraction force of the front and rear annular elastic members 16A and 16B before the male joint 11 is inserted, a large impact or vibration is applied to the segment. When it acts, the front and rear diameter expanding holders 17A and 17B may come off, and the front and rear annular elastic members 16A and 16B may fall off the front and rear annular grooves 15A and 15B of the female joint 14. Once the front and rear annular elastic members 16A and 16B drop off, the subsequent male joint 11 and female joint 14 cannot be connected.

  (2) The female joint is manufactured by casting or forging due to its structural complexity, or by performing lathe processing and cutting processing from a steel bar or the like. In the case of manufacturing by casting or forging, a dedicated die is required. When manufacturing from a steel bar, the outer shape is formed with a lathe or the like, drilling of the inner peripheral portion, and forward and rear annular grooves provided in the inner peripheral portion are required, which complicates the manufacturing process. The front and rear annular grooves may be formed by cutting or casting, but they must be formed with a larger width than the annular elastic member over the entire circumference. As described above, when the female joint is manufactured by casting or forging, the mold is costly, and when it is manufactured from the steel bar, the processing is complicated and the manufacturing cost is increased.

  (3) Cost is required to manufacture the annular elastic members 16A and 16B. That is, as shown in FIG. 12, the annular elastic members 16 </ b> A and 16 </ b> B are manufactured by passing a plurality of core members 18 through the coil spring 19 and connecting the ends of the coil spring 19. The ends of the coil spring 19 are connected to each other by narrowing the one end of the coil spring 19 and inserting it into the other end in a state where it is unscrewed by a required amount, and releasing and screwing in the unscrewed amount. However, this work is complicated due to the presence of the core material 18, and as a result, the production of the annular elastic members 16 </ b> A and 16 </ b> B is costly.

  Therefore, the object of the present invention is that the segments can be firmly coupled with one touch, and there is no problem that the segments cannot be coupled even if a large impact or vibration is applied to the segments, and the cost is low. An object of the present invention is to provide a joint for a segment that can be manufactured.

  The present invention has been made to achieve the above-described object, and is characterized by the following.

  The invention according to claim 1 is a joint for a segment including a male joint for joining segments for shield tunnel construction and a female joint into which the male joint is inserted. The male joint has a rod shape, A constricted portion formed with two stepped portions, and a tapered end portion, and the female joint includes a tubular body formed with a cut, a key member fitted into the cut, and the key member. And a pressing force applying means for applying a pressing force for allowing the step to enter the notch, wherein the step portion is formed on the tip end side of the male joint.

  The invention according to claim 2 is a joint for a segment including a male joint for joining segments for shield tunnel construction and a female joint into which the male joint is inserted. A neck portion formed with a plurality of stepped portions, and a tapered end portion, and the female joint includes a tubular body formed with a cut, a key member fitted into the cut, and the key member And a pressing force applying means for applying a pressing force for entering the notch into the notch, and the height of the stepped portion is formed to be higher toward the tip end side of the male joint. It is what has.

  The invention described in claim 3 is characterized in that, in the invention described in claim 1 or 2, a pair of the cuts of the female joint are formed to face each other.

  A fourth aspect of the invention is characterized in that, in the invention according to any one of the first to third aspects, the key member is formed of a rod-shaped member.

  The invention according to claim 5 is characterized in that, in the invention according to any one of claims 1 to 4, the pressing force applying means is made of an elastic body.

  The invention described in claim 6 is characterized in that, in the invention described in claim 5, the elastic body comprises a coil spring, a leaf spring or a rubber band.

  According to this invention, the segments can be firmly coupled with one touch, and there is no problem that the segments cannot be coupled even if a large impact or vibration is applied to the segments as in the conventional joint. Moreover, it can be manufactured at a low cost.

  Next, one embodiment of the segment joint of the present invention will be described with reference to the drawings.

  1 is a perspective view showing a joint for a segment of the present invention, FIG. 2 is a perspective view showing a male joint of another shape, FIG. 3 is a perspective view showing a segment to which the joint of the present invention is attached, and FIG. These are sectional drawings which show the coupling | bonding process by the joint for segments of this invention, The figure (A) is sectional drawing which shows the state before coupling | bonding, The figure (B) shows a key member in the step part of a constriction part. Sectional drawing which shows the state which entered, The same figure (C) is sectional drawing which shows the state which coupling | bonding was completed.

  In FIG. 1, reference numeral 1 denotes a rod-shaped male joint, which includes a constricted portion 2 and a tapered tapered tip portion 3. The constricted portion 2 is formed in two steps by one step portion 4 formed on the tip end side 3 in this. The constriction part on the upstream side in the insertion direction of the male joint 1 is indicated by 2A, and the constriction part on the downstream side is indicated by 2B. A plurality of step portions 4 may be formed. This will be described later. The male joint 1 can be easily manufactured by turning a round steel bar. The constricted portion 2 in which the step 2A of the male joint 1 is formed may not be formed on the entire circumference of the male joint 1, but may be formed on a part of the male joint 1 as shown in FIG.

  Reference numeral 5 denotes a female joint into which the male joint 1 is inserted. The steel pipe main body 7 in which a cut 6 is formed in the outer peripheral portion, a key member 8 fitted in the cut 6, and the key member 8 are cut into 6 It consists of an elastic body 9 as a pressing force applying means for applying a pressing force to enter. The elastic body 9 may be a coil spring, a leaf spring, a rubber band, or the like. In this example, the elastic body 9 is composed of a tension coil spring fixed to both ends of the key member 8.

  Two cuts 6 are formed facing the main body 7. The notch 6 holds the key member 8 at a predetermined interval before the male joint 1 is inserted. When the male joint is inserted, the key member 8 is pressed against the male joint 1 by the elastic body 9 so that the shape of the male joint 1 is obtained. It serves as a guide for the approaching and separating movement of the corresponding key member 8. Therefore, the depth of the cut 6 is appropriately set so that this role is exhibited.

  The key member 8 is made of a steel bar, and a shearing force is applied to the steel bar when a tensile force acts on the joint. Therefore, the steel bar has a strength that can sufficiently counter this shearing force. The steel bar can be designed with the material, cross-sectional area and the like as appropriate according to the shearing force. The key members 8 are attracted to each other toward the inside of the main body 7 by the pressing force of the elastic force 9 in the key member 8 of the main body 7, so that the distance between them is maintained.

  As described above, the female joint 5 includes a steel pipe main body 7 in which the notch 6 is formed, a key member 8 made of a bar steel that enters the notches 6 and receives a shearing force when a tensile force acts on the joint portion, Since it consists of a simple structure with the elastic body 9 provided in the key member 8, it can be manufactured at low cost. That is, when a tensile force is applied to the joint portion of the main body 7, a shearing force is applied to the key member 8, and simultaneously, a support stress is applied to the notch 6 by the key member 8. A commercially available steel pipe or the like having a material and a plate thickness capable of resisting resistance can be used.

  The cut formed in the main body 7 may be provided only in a part of the outer peripheral portion, and the processing is simple. The key member 8 may be any material and cross section that can resist the shearing force when a tensile force acts on the joint, and can be manufactured by cutting a commercially available steel bar to a required length in the longitudinal direction. . The elastic body 9 only needs to be able to apply a predetermined pushing force, and a commercially available coil spring or the like can be used, and complicated processing is not required.

  As described above, the steel pipe main body, the key member, and the elastic body can be manufactured on the basis of a commercially available material, and can be manufactured at low cost because of less processing.

  According to the segment joint of this invention comprised in this way, segments are couple | bonded as follows.

  As shown in FIG. 3, the male joint 1 is fixed to one axial coupling surface (S1) of the segment 10, the tip 3 is projected and fixed, and the female joint 5 is coupled to the other axial coupling surface (S2). Fix it. In the case of a steel segment as in this example, both joints 1 and 5 are fixed to a joint plate (P) (see FIG. 4). In this case, it goes without saying that the insertion port for the male joint 1 is provided in the joint plate (P) on the female joint 5 side.

  Then, as shown in FIG. 4A, the other segment 10B is brought closer to one segment 10A, and insertion of the male joint 1 into the female joint 5 is started. After the start of insertion, as shown in FIG. 4B, the key member 8 is pushed and spread against the elastic force of the tension coil spring as the elastic body 9 by the tip 3 of the male joint 1, and then the elastic force To return to the original state and enter the constricted portion 2A on the upstream side. Even if the insertion of the male joint 1 into the female joint 5 is finished in this state, the key member 8 enters the upstream constricted portion 2A and engages with the distal end portion 3, so that a tensile force acts between the joints. However, there is no fear that the segments 10A and 10B are uncoupled. In this case, there is a slight gap between the segments 10A and 10B.

  When the insertion further proceeds, as shown in FIG. 3C, the key member 8 enters the downstream constricted portion 2B, and the segments 10A and 10B are completely coupled. When the key member 8 enters the downstream constricted portion 2B, the key member 8 engages with the stepped portion 4, so that even if a tensile force acts between the joints, there is a possibility that the coupling of the segments 10A and 10B is released. Absent.

  The coupling process will be further described with reference to FIG. 5 which is a partially enlarged view of FIG.

  FIG. 5A shows a state in which the key member 8 is not engaged with the step portion 4, and FIG. 5B shows that the key member 8 enters the upstream constriction portion 2A of the step portion 4 and engages therewith. In this state, even if a tensile force in the direction of the arrow acts, the gap (g) between the segments 10A and 10B does not further spread, that is, the segments are joined without opening.

  The gap (g) is caused by, for example, a construction error due to misalignment, sand or the like, or a segment manufacturing error, and the segment cannot be pushed any further.

  When the gap (g) does not occur between the segments 10A and 10B due to construction errors or manufacturing errors, the key member 8 enters the upstream constricted portion 2B and engages as shown in FIG. In the figure, even if a tensile force in the direction of the arrow acts, the segments 10A and 10B are joined without opening.

  Next, a joining process in the case where the male joint 1 is not provided with the stepped portion 4 will be described with reference to FIG.

  The gap (g) is set by construction error, manufacturing error, etc., and the constricted portion 2 is formed so that the segments can be coupled to each other. 6A shows a state in which the key member 8 is not engaged with the constricted portion 2, and FIG. 6B shows a state in which the key member 8 enters and engages with the constricted portion 2, and this state. In the figure, even if a tensile force in the direction of the arrow acts, the gap (g) between the segments 10A and 10B does not further spread, that is, the segments are joined without opening. In this case, as in the present invention, the same effect is obtained as when the step portion is provided.

  However, when the gap (g) due to construction error, production error, etc. does not occur, as shown in the figure (C), when a tensile force in the direction of the arrow acts in the figure, as shown in the figure (D). Opening occurs.

  The gap (g) is appropriately set according to the situation at the site (earth pressure, soil quality, linearity, etc.), the shape and material of the segment, and the constricted portion and stepped portion are designed. Similarly, when a plurality of steps are provided, which will be described later, the design is based on several stages of design errors and manufacturing errors.

  As described above, even when a gap (opening) is generated between the segments due to a manufacturing error or a construction error, a shearing force is generated in the key member 8 by pulling, so that the segments can be reliably coupled to each other. .

  According to the joint of the present invention, the segments 10A and 10B are thus joined to each other. As described above, the female joint 5 includes the steel pipe main body 7 in which the cuts 6 are formed, and the cuts 6 Since it has a simple structure with a key member 8 made of steel bar that receives shearing force when a tensile force acts on the joint portion, and an elastic body 9 made of a coil spring or the like provided on the key member 8, it is complicated. The manufacturing cost of the joint can be reduced as compared with the conventional joint having the structure. Moreover, even if a large impact or vibration is applied to the segment as in the conventional joint, the key member 8 is strongly pressed against the notch 6 of the steel pipe main body 7 by the elastic body 9. There is no fear of dropping off, and as a result, there is no problem that the segments cannot be joined. The gap formed by the inner surface of the main body 7 and the maximum outer diameter of the male joint 1 can absorb misalignment during segment coupling. This void can be set as appropriate.

  The above is the case where the present invention is applied to a steel segment, but it can be applied to a concrete segment or a composite segment of steel and concrete. In the case of a concrete segment, it is necessary to cover the periphery of the female joint 5 with a box 21 as shown in FIG.

  When the rectangular segments are joined by the joint of the present invention, as shown in FIG. 8, the male joint 1 may be made of a square steel bar and the female joint 5 may be made of a square steel pipe.

  The above is a case where the constricted portion 2 of the male joint 1 is formed in two steps by one step portion 4, but a plurality of step portions 4 may be provided. FIG. 9 shows an example in which two step portions 4 are provided. In this case, the constricted part 2 is formed in three constricted parts. As the number of constricted portions increases, the coupling interval between segments can be finely adjusted.

It is a perspective view which shows the joint for segments of this invention. It is a perspective view which shows the male joint of another shape. It is a perspective view which shows the segment to which the coupling of this invention was attached. It is sectional drawing which shows the coupling | bonding process by the joint for segments of this invention, The figure (A) is sectional drawing which shows the state before coupling | bonding, The figure (B) is that the key member entered the step part of the constriction part. Sectional drawing which shows a state, The figure (C) is sectional drawing which shows the state which coupling | bonding was completed. It is a perspective view which shows the joint for segments of this invention. FIG. 5 is a partially enlarged view of FIG. 4. FIG. 4A shows a state where the key member is not engaged with the stepped portion, and FIG. FIG. 5C shows a state in which the key member enters and engages with the constricted portion on the downstream side of the stepped portion. It is a figure which shows the coupling | bonding process when not providing a step part in a male coupling, The figure (A) is a state which is not engaging with a constriction part, The figure (B) is a state where a key member is The constricted part is in the engaged state. FIG. (C) is a combined state when no gap (g) due to construction error or manufacturing error occurs, and FIG. It is a state that has occurred. It is sectional drawing at the time of applying the joint for segments of this invention to a concrete segment. It is a perspective view which shows the male joint and female joint at the time of applying the joint of this invention to a rectangular segment. It is sectional drawing which shows the male coupling of this invention which provided two step parts in the constriction part. It is a partial notch perspective view which shows the conventional coupling before coupling | bonding. It is a partial notch perspective view which shows the conventional coupling just before completion | finish of coupling | bonding. It is a partial notch perspective view which shows the cyclic | annular elastic member of the conventional joint. It is a perspective view which shows the segment to which the conventional coupling was attached.

Explanation of symbols

1: male joint 2: constricted portion 2A: upstream constricted portion 2B: downstream constricted portion 3: distal end portion 4: stepped portion 5: female joint 6: notch 7: main body 8: key member 9: elastic body 10: segment 10A : One segment 10B: the other segment 21: box 11: male joint 12A: front constricted portion 12B: rear constricted portion 13A: front projecting portion 13B: rear projecting portion 14: female joint 15A: front annular groove 15B: rear annular groove 16A: Front annular elastic member 16B: Rear annular elastic member 17A: Front enlarged diameter holder 17B: Rear enlarged diameter holder 18: Core material 19: Coil spring 20: Segment 21: Box

Claims (6)

In a joint for a segment consisting of a male joint for joining segments for shield tunnel construction, and a female joint into which the male joint is inserted,
The male joint has a rod shape and has a constricted portion in which one step portion is formed and a tapered tapered tip portion, and the female joint has a tubular body in which a cut is formed, and in the cut. A key member to be fitted; and a pressing force applying means for applying a pressing force to the key member so that the key member is inserted into the notch. The step is formed on the distal end side of the male joint. This is a segment joint. In a joint for a segment consisting of a male joint for joining segments for shield tunnel construction, and a female joint into which the male joint is inserted,
The male joint has a rod shape, and has a constricted portion formed with a plurality of stepped portions and a tapered tapered tip portion, and the female joint has a tubular body formed with a cut and an inner portion of the cut. And a pressing force applying means for applying a pressing force to the key member so that the key member enters the notch, and the height of the stepped portion is on the tip end side of the male joint. A joint for segments characterized by being formed higher as it goes.   The segment joint according to claim 1 or 2, wherein a pair of the cuts of the female joint are formed to face each other.   The joint for a segment according to any one of claims 1 to 3, wherein the key member is a rod-shaped member.   The joint for a segment according to any one of claims 1 to 4, wherein the pressing force applying means is made of an elastic body.   6. The segment joint according to claim 5, wherein the elastic body comprises a coil spring, a leaf spring, or a rubber band.

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