JP3208742U - Segment hanging jig - Google Patents

Abstract

A segment hanging jig capable of reducing the occurrence of segment load is provided. A segment suspension jig 1 for lifting a segment by attaching it to an injection hole of a segment, wherein a spiral protrusion that is screwed into the injection hole is provided on an outer peripheral surface of a shaft portion 2 inserted into the injection hole. A head portion 3 that supports the shaft portion is provided above the shaft portion, and a screw portion that is movable in the axial direction of the injection hole by rotating the shaft portion; and an upper side of the screw portion. And a connecting portion 8 having a connecting hole 5 into which a suspension connecting material for lifting the segment is inserted, and with a hanging jig attached to the segment where the position of the center of gravity of the segment and the position of the injection hole are different, A connecting hole is provided at the position of the center of gravity of the segment. [Selection] Figure 1

Description

  The present invention relates to a hanging jig, and more particularly to a segment hanging jig used for transporting a segment.

  The hanging jig according to the present invention is used for a shield method.

  In the shield method, the ground is excavated by a cutter head provided in front of the shield excavator, and the segments are assembled in a ring shape by an erector provided behind the excavator so that the ground does not collapse. This shield method is often used for construction of tunnels in urban areas.

With a shield with a small-diameter cross section, segment transport is performed as follows.
That is, a guide rail for conveying the segment from the tunnel entrance side to the excavator is provided, and a hoist that moves freely along the guide rail is attached.
At a predetermined position, the worker lifts the segment carried on the segment carriage moved along the track rail laid in the tunnel via a lifting jig connected to the lower end of the segment by a hoist. Hold and transfer the segment onto the transport roller line that extends to the rear of the shield excavator, and the operator manually pushes the rear end of the transferred segment along the transport roller line. The segment is transported to the part.

  The conventionally used hanging jig 101 is inserted into the segment injection hole 115 as shown in FIG. The hanging jig 101 has a shaft portion 102 that is screwed with the wall surface of the injection hole 115, and a head portion 103 and a connecting portion 108 in order from the shaft portion 102 upward. The connecting portion 108 is provided with a connecting hole 105. The position where the connection hole 105 is provided is on the central axis Y of the shaft portion 102. That is, the position of the segment injection hole 115 and the position of the connecting hole 105 of the hanging jig 101 are the same.

  When the segment is an axial insertion type segment, the shape of the K-type segment and the B-type segment is trapezoidal, so the position of the center of gravity of the segment and the position of the injection hole of the segment are different. When a conventional hanging jig is attached to this segment, the position of the connecting hole of the hanging jig and the position of the center of gravity of the segment are different. Therefore, when the hoist that lifts the segment moves along the guide rail, there is a possibility that the segment will be crushed.

  Accordingly, the main problem to be solved by the present invention is to reduce the occurrence of segment spillage and to enable safe transportation.

  The present invention is a segment hanging jig that is attached to a segment injection hole and lifts the segment, and is configured as follows to solve the above-described technical problem. That is, a segment suspension jig for lifting a segment by being attached to an injection hole of a segment, wherein a spiral protrusion that is screwed into the injection hole is provided on an outer peripheral surface of a shaft portion that is inserted into the injection hole. A head portion that supports the shaft portion is provided above the portion, a screw portion that is movable in the axial direction of the injection hole by the rotation of the shaft portion, and for lifting the segment above the screw portion And a connecting part with a connecting hole for inserting the suspension connecting material, and connecting to the position of the center of gravity of the segment with the lifting jig attached to the segment where the position of the center of gravity of the segment and the position of the injection hole are different A hole is provided.

  Hereinafter, this device will be described by dividing it into components. Since a strong bending stress is applied to the hanging jig due to the weight of the segment or an impact during assembly, it is preferable to use a material having a high bending strength. Specifically, it is preferable to use steel having high strength such as tool steel.

  In a state where the suspension jig is attached to the segment, the connection portion of the suspension jig protrudes from the inner surface of the segment. The connecting portion has, for example, a shape in which two plate-like members are crossed in a cross shape, and the plate-like member has a plurality of connecting holes penetrating the plate-like member. When lifting the segment, one end of the suspension connection member is inserted into the connection hole at the center of gravity of the segment among the plurality of connection holes. Thereafter, the suspension connecting material is lifted. However, since the connection hole into which the suspension connecting material is inserted is located at the center of gravity of the segment, the segment can be prevented from being crushed and stable lifting can be performed. In addition, as said suspension connection material, flexible members, such as a wire rope and a chain, or an assembly material can be illustrated.

  Moreover, you may prepare multiple types of suspension jig | tool which provided one connection hole in the connection part according to the difference in the gravity center position of several segments. When the segment is lifted, a lifting jig provided with a connection hole at the center of gravity of the lifting segment is selected, and the selected lifting jig is attached to the segment for lifting. Also in this case, since the connecting hole is located at the center of gravity of the segment, the segment can be prevented from being overloaded, and stable lifting can be performed.

  The lower side of the shaft portion may be screwed with a socket or a nipple of the injection hole, and the upper side of the shaft portion may be screwed with a nut. By adopting such a double nut structure, it is possible to suppress the loosening of the screw portion that occurs due to the shaking of the segment.

  The nut is preferably provided with a screw lock handle. This screw lock handle facilitates the rotation of the nut and makes it possible to tighten the nut. The screw lock handle is composed of, for example, a main body portion and a grip portion. The main body portion is made of, for example, a rod-shaped member that is bent in an annular shape or refracted into a polygonal shape, and an intermediate portion thereof is fixed in such a manner as to sandwich the outer surface of the nut from both sides. Moreover, this main-body part is attached substantially horizontally with respect to a hanging jig. Specifically, it is preferable to provide an inclination that gradually increases from the middle part to the end part of the handle. Since the interior of the segment has a gently concave shape as a whole, contact between the interior of the segment and the end of the screw lock handle can be avoided by providing a height at the end of the screw lock handle. Further, the grip portion of the screw lock handle is made of, for example, a rod-like member, and the lower end portion of the grip portion is fixed to the end portion of the main body portion by fusion or the like. And the form extended upwards from the lower end part of a holding part is shown. The gripping portion may be provided with an inclination such that the upper end portion of the gripping portion is slightly tilted inward. This is because a person who performs the tightening operation of the screw lock handle often performs the tightening operation while standing near the middle of the screw lock handle, and thus providing the inclination makes it easier for the operator to grip the grip portion. .

The procedure for lifting the segment using the segment lifting jig according to the present invention is as follows.
A screw thread formed on the outer peripheral surface of the shaft portion of the hanging jig and a screw groove formed on the inner peripheral surface of a nut provided with a screw lock handle are screwed together. As a result, the nut is attached to the upper outer periphery of the shaft portion. Next, the shaft part to which the nut is attached is inserted into the segment injection hole, and the thread of this shaft part is screwed into the thread groove formed in the socket or nipple of the segment injection hole. In this way, the shaft portion of the hanging jig is attached to the segment injection hole. Thereafter, the screw lock handle is rotated to further tighten the nut. At the time of this tightening, it is necessary to apply a strong rotational force to the second nut, but this rotational force can be easily generated by rotating the screw lock handle. Moreover, by using such a double nut structure, it is possible to suppress the occurrence of looseness of the threaded portion. Then, one end or the other end of the suspension connection member is connected to a connection hole located at the center of gravity of the segment among the plurality of connection holes provided in the connection portion of the hanging jig.

  In addition, when multiple types of suspension jigs with one insertion hole in the connecting part are prepared according to the difference in the center of gravity of multiple segments, the type of suspension jig attached to the segment according to the type of each segment change. In this case, since only one connection hole is provided in the connection part of the suspension jig, one end or the other end of the suspension connection member is connected to the connection hole.

  Thus, after attaching a suspension connection material to the connection part of a suspension jig, a segment is lifted by the hoist connected with this suspension connection material. And a hoist moves along a guide rail and conveys a segment to the excavator vicinity. In addition, as a kind of segment to convey, in the case of an axial direction insertion type, an A type segment, a B type segment, and a K type segment can be mentioned, for example. Since the centroid positions of these segments are different from each other, if the suspension connection material is connected to the connection hole at the centroid position of each segment, it is possible to suppress the load during the transportation of the segments.

  As described above, the segment suspension jig according to the present invention is provided with a connection hole corresponding to the position of the center of gravity of each segment. By connecting the suspension connecting material to the connecting hole at the center of gravity of each segment, the occurrence of segment load can be reduced or prevented, and the segment can be transported safely.

It is the perspective view which showed the hanging jig for segments of 1st Embodiment of this invention. It is the perspective view which looked at the segment from the inner surface side. It is the perspective view which showed the state which attached the hanging jig to the segment. It is a front view of the hanging jig which concerns on 1st Example. It is a top view of the connection part of the hanging jig which concerns on 1st Example. It is a partially broken front view of the thread part of the hanging jig which concerns on this invention. It is a front view of the 1st nut attached to the hanging jig which concerns on this invention. It is the partially broken front view which showed the state which attached the hanging jig which concerns on this invention to the segment injection hole. It is a top view of the 2nd nut attached to the hanging jig | tool which concerns on this invention, and the screw lock handle attached to the outer periphery. It is a front view of the 2nd nut attached to the suspension jig | tool which concerns on this invention, and the screw lock handle attached to the outer periphery. It is the front view which showed the state which assembled the segment in the ring shape. It is the figure which showed A1 type segment, (A) is a front view, (B) is a rear view. It is the figure which showed the B2 type segment, (A) is a front view, (B) is a rear view. It is the figure which showed the K-type segment, (A) is a front view, (B) is a rear view. It is the perspective view which showed the hanging jig for segments of 2nd Embodiment. It is the perspective view which showed the hanging jig for segments of 3rd Embodiment. It is the perspective view which showed the hanging jig for segments of 3rd Embodiment. It is the front view which showed the conventional hanging tool for segments.

  Hereinafter, preferred embodiments of the segment hanging jig of the present invention will be further described with reference to the drawings. FIG. 1 shows a segment hanging jig 1 according to an embodiment of the present invention.

(Suspension jig for segment)
As shown in FIG. 1, the segment hanging jig 1 according to this embodiment includes a screw portion 4 including a shaft portion 2 and a head portion 3, and a connecting portion 8. The shaft portion 2 is made of steel, and as shown in FIG. 6, a spiral protrusion is provided on the outer periphery. The shaft portion 2 is cylindrical or conical.

  The head 3 is provided above the shaft 2 and supports the shaft 2. The head 3 may be integrally formed with the shaft 2 or may be manufactured separately and firmly fixed by fusion or the like in a later manufacturing process. The diameter of the head 3 is larger than the diameter of the upper end portion of the shaft portion 2 and the diameter of the segment injection hole 15. Further, when the hanging jig 1 is attached to the segment 10, as shown in FIG. 3, the shaft portion 2 is accommodated in the segment injection hole 15, but the head 3 is protruded upward from the segment injection hole 15. .

  The connecting portion 8 is provided on the upper side of the head 3 and is used when the suspension connecting member 7 is connected to the hanging jig 1. This connecting portion 8 may also be manufactured integrally with the head portion 3 and the shaft portion 2, or manufactured separately from the head portion 3 and the shaft portion 2, and firmly fixed by fusion or the like in the subsequent manufacturing process. Also good.

  In the first embodiment, the lower end of the connecting portion 8 is fixed to the upper end of the head 3. That is, the two plate-like members 8A and 8B constituting the connecting portion 8 are arranged on the head 3 so as to intersect in a cross shape. The length in the width direction of the plate-like members 8A and 8B is longer than the length of the diameter of the head 3. This is because a connecting hole 5 described later is provided outside the head 3 in the width direction.

  Moreover, as shown in FIG. 4, when the plate-shaped member 8A of Example 1 is viewed from the front, it has a heptagon shape. More specifically, the chamfered portion 8X is formed by chamfering three corners of a quadrangle. Thus, by making the corner part an obtuse angle, the touch when the worker touches the corner part becomes gentle.

  In Example 1, the heights of the two plate-like members 8A and 8B are different from each other, and the height of one plate-like member 8A is about twice the height of the other plate-like member 8B. Specifically, the height of the plate-like member 8A provided with the connection hole 5K for the K-type segment (10K) and the connection hole 5A for the A-type segment (10A) is the connection hole for the B-type segment (10B). It is higher than the height of the plate-like member 8B provided with 5B. As shown in FIG. 1, since the plate-like member 8B is located below the connecting hole 5A provided in the plate-like member 8A, if the height of the plate-like member 8B and the plate-like member 8A is the same, the connecting hole 5A. The plate member 8B crosses the inside. In such a state, it becomes difficult to connect the suspension connecting member 7 to the connecting hole 5A of the plate-like member 8A. Therefore, the height of the plate-like member 8A is set higher than the height of the plate-like member 8B.

  The plate-like member 8A is provided with a connecting hole 5K for the K-type segment (10K) and a connecting hole 5A for the A-type segment (10A). The diameter Z of the connecting hole 5 is preferably about 4 to 5 cm. This is because if the diameter Z of the connecting hole 5 is small, it is difficult to insert the suspended connecting material 7, and if the diameter Z of the connecting hole 5 is large, the connecting portion 8 becomes large. In the first embodiment, it is assumed that the injection hole 15 of the A-type segment (10A) is provided at a position about 5 to 10 cm away from the center of gravity of the A-type segment (10A). The connecting hole 5A for the A-shaped segment (10A) to be provided is provided at a position about 5 to 10 cm away from the central axis of the shaft portion 2 of the hanging jig 1. That is, the connecting hole 5A for the A-type segment (10A) is provided at the center of gravity of the A-type segment (10A) with the segment hanging jig 1 according to the first embodiment attached to the A-type segment (10A). To.

  Further, in the first embodiment, it is assumed that the injection hole 15 of the K-shaped segment (10K) is provided at a position shifted by about 4 to 5 cm from the position of the center of gravity of the K-shaped segment (10K). A connecting hole 5K for the K-shaped segment (10K) provided in 8A is provided at a position shifted from the central axis of the shaft portion 2 by about 4 to 5 cm. In this case as well, as with the A-type segment (10A), the K-shaped segment is placed at the center of gravity of the K-shaped segment (10K) with the segment hanging jig 1 according to the first embodiment attached to the K-shaped segment (10K). A connection hole 5K for (10K) is provided.

  In Example 1, the plate-like member 8B is orthogonal to the plate-like member 8A. Specifically, the plate member 8B is divided into left and right by the plate member 8A. The divided left and right plate-like members 8B are respectively provided with connection holes 5 for the B-type segment (10B). That is, when the suspension jig 1 according to the first embodiment is viewed from above, as shown in FIG. 5, the connection hole 5K for the K-type segment (10K) is located on the upper side of the drawing, and the B2 type is on the right side of the drawing. A connecting hole 5B2 for the segment (10B2) is provided, and a connecting hole 5B1 for the B1 type segment (10B1) is provided on the left side of the drawing. Since the shapes of the B1 type segment (10B1) and the B2 type segment (10B2) are the left and right objects, the position of the segment injection hole 15 is also the left and right objects.

(Segment injection hole)
The segment injection hole 15 refers to a hole provided in the segment 10 for injecting the backfill injection material into the tail void. The segment injection hole 15 has a socket and a nipple 23 arranged so as to be in contact with the inner peripheral (15M) surface of the segment 10. The socket and nipple 23 are made of steel pipe or cast iron, for example. A check valve (not shown) may be provided on the natural ground side of the socket or nipple 23 in order to prevent water or earth and sand from being ejected from the natural ground.

(Screw lock handle)
As shown in FIG. 8, the shaft portion 2 of the hanging jig 1 is inserted into the socket or nipple 23. A nut 22 as shown in FIG. 7 is attached to the shaft portion 2 above the fastening portion. It is good to attach. The nut 22 and the socket or nipple 23 form a double nut. By using a double nut, slippage between the screw portion 4 and the socket or nipple 23 can be reduced, and rotational loosening can be prevented.

  As a method of tightening the double nut, first, a nut 22 is attached to the tip end side of the shaft portion 2 of the hanging jig 1, and the nut 22 is rotated and moved to the head portion 3 side of the shaft portion 2. Next, the shaft portion 2 of the hanging jig 1 is inserted into the socket 23 and tightened. Next, the nut 22 moved to the head 3 side of the shaft portion 2 is tightened. Thereafter, with the nut 22 fixed, the shaft portion 2 is rotated in the loosening direction with respect to the socket etc. 23 until the nut 22 on the head 3 side and the socket etc. 23 on the tip side are crimped on the screw surface. tighten.

  As shown in FIGS. 9 and 10, a screw lock handle 6 may be attached to the outer surface of the nut 22. Generally, the nut 22 needs to be tightened strongly using a tool such as a spanner or a spectacle wrench. However, by providing the screw lock handle 6, the nut 22 can be easily tightened and can be tightened more strongly than in the case where a spanner or the like is used. When the screw lock handle 6 is rotated, a strong load is applied. Therefore, it is preferable to use a material having high strength such as tool steel as the material of the screw lock handle 6.

  As described above, in order to suspend the segment 10 horizontally, it is necessary to position the connecting hole 5 of the hanging jig 1 at the center of gravity of the segment 10. To that end, (1) the connecting hole 5 of the hanging jig 1 is eccentric according to the type of the segment 10, and (2) the direction of the hanging jig 1 is set in a certain direction according to the type of the segment 10. It is necessary to fix. Therefore, providing the screw lock handle 6 can meet the request (2).

  More specifically, in the final stage of the double nut tightening process, the shaft portion 2 is rotated in the loosening direction with respect to the socket 23 or the like. Considering the amount of movement at this time, the nut 22 is tightened to a certain strength. At this time, providing the screw lock handle 6 makes it easy to adjust the tightening amount of the nut 22. As a result, the connection hole 5 of the hanging jig 1 can be reliably positioned at the center of gravity of the segment 10 after the tightening of the double nut is completed.

  The screw lock handle 6 includes a main body portion 6A and a grip portion 6B as shown in FIGS. 9 and 10, for example. The main body portion 6A is made of, for example, a rod-like member, and can be formed into an annular or polygonal shape as a whole. That is, the intermediate portion of the main body 6A is fixed so as to sandwich the head 3 of the hanging jig 1 from both sides. Then, the distance between the opposing rod-like bodies gradually decreases from the intermediate portion of the main body portion 6A toward the distal end side, and the opposing rod-like bodies are joined together in the vicinity of the distal end of the main body portion 6A. . In consideration of the possibility of an operator coming into contact with the tip portion, it is better to use a semicircular arc shape than to sharpen the tip portion. However, as will be described later, in order to provide the gripping part 6B so as to come into contact with the inner edge on the front end side of the main body part 6A, it is better to narrow the inner angle of the front end part. On the other hand, in order to increase the strength of the screw lock handle 6 on the distal end side of the main body portion 6A, it is preferable to provide a bridging portion 6C so as to bridge the opposing rod-shaped bodies. The screw lock handle 6 is preferably left and right across the head 3 of the hanging jig 1.

  Further, when the main body 6A is viewed from a cross section, the main body 6A is attached to the hanging jig 1 substantially horizontally. That is, it is preferable to provide an inclination that the intermediate portion of the main body portion 6A is fixed to the head portion 3 of the hanging jig 1 and is gradually inclined upward as it goes from there to the distal end side of the main body portion 6A. As shown in FIG. 2, the inner surface 11 of the segment 10 often has a gently concave shape as a whole. Therefore, by providing a height on the front end side of the main body portion 6A of the screw lock handle 6, FIG. As shown, the contact between the inner surface 11 of the segment 10 and the tip of the screw lock handle 6 can be avoided. Therefore, the inclination angle of the main body 6 </ b> A is preferably larger than the inclination angle of the inner surface 11 of the segment 10.

  The screw lock handle 6 is provided with a gripping portion 6B. The grip portion 6B is a portion that is gripped by an operator, and is used when the screw lock handle 6 is rotated. The grip portion 6B is made of, for example, a rod-like member, and the lower end portion thereof is fixed to the inner edge of the tip portion of the main body portion 6A. The main body portion 6A and the grip portion 6B may be firmly fixed by fusion or the like so that the grip portion 6B does not come off from the main body portion 6A when the screw lock handle 6 is rotated. Further, the gripping part 6B shows a form extending upward from a lower end part fixed to the main body part 6A. And it is good for this holding part 6B to provide the inclination which an upper end side inclines a little inside so that an operator may hold it easily.

(Lifting process)
A process of lifting the concrete segment 10 using the hanging jig 1 according to the present invention will be described. The types of the segments 10 include steel concrete, steel, and ductile. The lifting target of the present invention is mainly the concrete segments 10. As shown in FIG. 2, the concrete segment 10 includes an outer surface 13 that comes into contact with the inner wall of the tunnel, a joint surface 12 that is located on the side of the outer surface 13, and an inner surface 11 that is opposite to the outer surface 13. The joint surface 12 is provided with joint bolts 16, joint bolt holes 14, and joint plates 17 for connecting adjacent segments 10. An injection hole 15 is provided from the vicinity of the center of the inner surface 11 of the segment 10 to the outer surface 13. The concrete segment 10 is entirely made of concrete, and in order to maintain its form, a plurality of reinforcing bars intersect with each other.

  As the segment 10 to which the hanging jig 1 according to the present invention is attached, for example, as shown in FIGS. 12 to 14, an A1 type segment (10A1), an A2 type segment (10A2), a B1 type segment (10B1), and a B2 type A segment (10B2) and a K-shaped segment (10K) assembled last in the vicinity of the apex can be mentioned. These segments 10 are different in shape and center of gravity, and the position where the injection hole 15 is provided is not necessarily at the center of gravity of the segment 10. Therefore, by using the suspension jig 1 according to the present invention to connect the suspension connecting member 7 to the position of the center of gravity of the segment 10, it is possible to suppress the occurrence of overload during transportation of the segment 10. The A1 type segment (10A1) and the A2 type segment (10A2) shown in FIG. 11 have the same shape, and the B1 type segment (10B1) and the B2 type segment (10B2) have a bilaterally symmetric shape.

  Each such segment 10 is first stacked on a carriage with the outer surface 13 facing downward, and is carried into an existing tunnel. Next, the hanging jig 1 according to the present invention is attached to the loaded segment 10. That is, the hanging jig 1 is inserted into the segment injection hole 15 formed near the center of the inner surface 11 of the segment 10. When the nut 22 having the screw lock handle 6 is used, the grip portion 6B of the screw lock handle 6 is gripped and rotated. By using a double nut, loosening of the screw can be prevented.

  A state in which the hanging jig 1 is attached to the segment 10 is shown in FIG. In FIG. 3, the shaft portion 2 of the screw portion 4 is fastened to the insertion hole, and from there upward, a nut 22 having a screw lock handle 6, a head portion 3 of the screw portion 4, and a connecting portion of the hanging jig 1 8 protrudes from the inner surface 11 of the segment 10.

  After attaching the suspension jig 1 to the segment 10, the suspension connection material 7 is connected to the connection portion 8 of the suspension jig 1. That is, the suspended connecting member 7 is inserted into an arbitrary connecting hole 5 among the plurality of connecting holes 5 formed in the connecting portion 8. Of the plurality of connection holes 5, the connection hole 7 into which the suspension connection material 7 is inserted is determined based on the position of the center of gravity of the segment 10 with the suspension jig 1 attached to the segment 10. 11, the connecting hole 5 located at a position perpendicular to the line 11 is selected.

  The method for determining the position of the connecting hole 5 is, for example, calculating the distance between the position of the injection hole 15 provided in each segment 10 and the position of the center of gravity, or the direction with the center of gravity viewed from the position of the injection hole 15. Ask for. Then, the state in which the hanging jig 1 is mounted on the segment 10 is obtained by simulation, and the connection holes 5 are provided at the distance and direction obtained by the above calculation. The connection hole 5 provided in this way is located on a perpendicular to the inner surface 11 of the segment 10 starting from the center of gravity of the segment 10. In addition, by performing the above calculation for each segment 10 such as A1 type segment (10A1), A2 type segment (10A2), B1 type segment (10B1), B2 type segment (10B2), K type segment (10K), A plurality of connecting holes 5 corresponding to the positions of the center of gravity of each segment 10 are formed in the connecting portion 8.

  In addition, the connection method of the connection part 8 of the suspension jig | tool 1 and the suspension connection material 7 is the rod-shaped body which bridges the U-shaped main body 21A and the both ends of the main body 21A to the lower end of the suspension connection material 7, for example. It can connect by providing the connecting tool 21 which consists of 21B, and letting the rod-shaped body 21B of the connecting tool 21 pass through the connecting hole 5 of the hanging jig 1.

  After connecting the suspension jig 1 and the suspension connecting member 7 in this manner, the upper end of the suspension connecting member 7 is combined with a hoist. Then, the segment 10 is lifted by the hoist, and the hoist is moved to the vicinity of the face along the guide rail laid at the upper end of the existing tunnel. Due to the movement of the hoist, the lifted segment 10 is carried to the vicinity of the face. As described above, since the suspension connecting material 7 is connected to the connecting hole 5 at the center of gravity of the segment 10, it is possible to suppress the occurrence of a load during the transportation of the segment 10, and to appropriately carry the segment 10. Can be performed stably. The segment 10 carried to the vicinity of the face is unloaded at an arbitrary position, and the hanging jig 1 is removed from the segment 10. Then, as shown in FIG. 11, the segment 10 is assembled in a ring shape by an erector provided behind the shield excavator.

(Example 2)
As Example 2 of the hanging jig 1 according to the present invention, a hanging jig 1 as shown in FIG. 15 can be used. That is, the connecting portion 8 of the hanging jig 1 may be composed of a plurality of protruding members 8C protruding upward from the head 3 of the screw portion 4, and the connecting holes 5 may be provided in each protruding member 8C. .

(Example 3)
Moreover, you may use the hanging jig 1 as shown in FIG. 16 and FIG. 17 as Example 3 of the hanging jig 1 which concerns on this invention. That is, the connecting portion 8 of the hanging jig 1 is composed of one protruding member 8C protruding upward from the head 3 of the screw portion 4, and one or two or more connecting holes 5 are provided in the protruding member 8C. It is done. As described above, since the position of the center of gravity differs depending on the shape of the segment 10, as shown in FIGS. 16 and 17, a plurality of suspension jigs 1 having different positions of the connecting holes 5 are prepared and attached depending on the position of the center of gravity of the segment 10. Change the type of jig 1. Although the hanging jig 1 as in the third embodiment may be used, the hanging jig 1 as in the first and second embodiments can be attached to all the segments 10 and is therefore highly convenient. .

  As described above, in the present invention, the connection hole 5 may be provided at the position of the center of gravity of the segment 10, and other various modifications that satisfy this are also included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Suspension jig | tool (according to this invention) 2 Shaft part 2U Upper screw thread 2D (Shaft part) Lower screw thread 3 Head 4 Screw part 5 Connection hole 5A Connection hole for A type segment 5B1 B1 Connecting hole for mold segment 5B2 Connecting hole for B2 type segment 5K Connecting hole for K type segment 6 Screw lock handle 6A Body part of screw lock handle 6B Grasping part of screw lock handle 6C Bridge part of screw lock handle 7 Suspended connecting material 8 Connecting portion 8A Plate member 8B Plate member 8C Protruding member 8X Chamfered portion of connecting portion 10 Segment 10A A type segment 10A1 A1 type segment 10A2 A2 type segment 10B B type segment 10B1 B1 type segment 10B2 B2 type Segment 10K K-type segment 11 (Segment) inner surface 12 (Seg Joint surface 13 (segment) outer surface 14 joint bolt hole 15 (segment) injection hole 15M (injection hole) inner periphery 15N (injection hole) outer periphery 16 joint bolt 17 joint plate 18 seal groove 21 connector 21A (Connector) main body 21B (connector) rod-like body 22 nut 23 socket or nipple 101 (conventional) lifting jig 102 shaft 103 head 104 screw part 105 connecting hole 108 connecting part 110 segment 111 (segment) Inner surface 113 (Segment) Outer surface 115 (Segment) injection hole Y Center axis of axis Z Z Diameter of connecting hole θ Vertical line passing through the center of segment ring,
Angle between the center of the segment ring and the line connecting the center of the K-shaped segment

Claims (4)

A segment hanging jig that lifts the segment by attaching it to the injection hole of the segment,
A spiral protrusion that is screwed into the injection hole is provided on the outer peripheral surface of the shaft portion that is inserted into the injection hole, and a head portion that supports the shaft portion is provided above the shaft portion, and the shaft portion rotates. A threaded portion that is movable in the axial direction of the injection hole by
On the upper side of the threaded portion, and a connecting portion having a connecting hole for inserting a suspension connecting material for lifting the segment,
A segment suspension jig characterized in that a connecting hole is provided at the position of the center of gravity of a segment in a state where the suspension jig is attached to a segment where the position of the center of gravity of the segment differs from the position of the injection hole. The segment hanging jig can be attached to a plurality of segments having different positions of the center of gravity,
The connecting portion is provided with a plurality of connecting holes corresponding to the positions of the different centers of gravity of the plurality of segments,
The segment lifting jig according to claim 1, wherein when the segment is lifted, the suspension connecting member is inserted into a connecting hole located at the center of gravity of the lifting segment among the plurality of connecting holes provided in the connecting portion. Plural types of suspension jigs provided with one insertion hole in the connecting portion are prepared according to the difference in the center of gravity position of the plurality of segments,
The segment lifting jig according to claim 1, wherein when the segment is lifted, a lifting jig provided with a connecting hole at the center of gravity of the lifting segment is used. The shaft portion of the screw portion is screwed with the nut on the upper end side from the position screwed with the injection hole,
The nut includes a screw lock handle;
The screw lock handle is
A main body portion that is formed of a rod-shaped member that is bent in an annular shape or refracted into a polygonal shape, the intermediate portion of which is fixed in a state where the nut is sandwiched from both sides,
The segment suspension jig according to any one of claims 1 to 3, further comprising: a grip portion made of a rod-like member that has a lower end portion fixed to a distal end portion of the main body portion and extends upward from the lower end portion.

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