JP6267547B2 - Jig for production of concrete filled steel segment - Google Patents

Description

  The present invention relates to a jig for manufacturing a segment of concrete-filled steel, and in particular, concrete-filled steel for forming a fastening space for a joint plate bolt used when connecting the segments in a ring shape in the circumferential direction. The present invention relates to a segment manufacturing jig.

  One of the tunnel construction methods is the shield method. With the shield method, every time the excavator installed in the vertical shaft is excavated for a certain length, the rear part, for example, an arc-shaped concrete filled steel segment (a steel frame (steel shell) of an existing steel segment) This is a segment in which concrete is packed in the factory in advance, but the design concept also includes a so-called “synthetic segment” that has a composite effect in which steel and concrete are mutually complemented in strength. This is a construction method in which a segment ring is constructed by assembling in a ring shape in the direction, and this is sequentially extended to form a cylindrical lining to construct a shield tunnel.

  The concrete-filled steel segment is high in strength and has a concrete overfill on the inner peripheral surface, so the secondary lining that needs to be performed during the shield method, that is, the segment ring The construction of covering the inner peripheral surface of the concrete with concrete and finishing it can be omitted.

  The concrete-filled steel segment will be described with reference to the drawings.

  4 is a schematic perspective view showing a concrete-filled steel segment, FIG. 5 is a schematic perspective view showing a steel frame when a concrete-filled steel segment is manufactured by a conventional method, and FIG. FIG. 7 is a longitudinal sectional view showing a structure for attaching the side frame to the main girder at the core position, and FIG. 8 is a perspective view showing a polystyrene foam block.

  As shown in FIG. 4, the concrete-filled steel segment is composed of a steel frame 1 and concrete 2 placed in the steel frame 1.

  The steel frame 1 is formed between a pair of arc-shaped main girders 4 connected by a reinforcing material 3 (usually called “vertical ribs”: see FIG. 5) and both ends of the main girders 4. It consists of a pair of welded joint plates 5 and a skin plate 6 welded to the outer peripheral surface of the main girder 4.

  The main girder 4 is formed with bolt holes 7 for main girder bolts (not shown) for connecting the segment rings in the axial direction, and the joint plate 5 is a joint plate for connecting the segments in a ring shape in the circumferential direction. Bolt holes 8 for use with bolts (not shown) are formed.

  As shown in FIG. 4, in the concrete 2, in a portion corresponding to the bolt hole 7, a recessed portion 9 (usually referred to as “bolt box”) serving as a space for fastening the main girder bolt. ) Is formed, and a recessed portion 10 is formed at a position corresponding to the bolt hole 8 as a space for fastening the joint plate bolt.

  The concrete 2 is formed with the above-described secondary embedding portion 11 for secondary lining (see FIG. 4).

  In order to manufacture a concrete-filled steel segment, first, a steel frame 1 as shown in FIG. 5 is manufactured, and a core 12 for forming a recessed portion 9 in the steel frame 1 (see FIG. 7). And a core (not shown) for forming the recessed portion 10 is installed, and the side frame 13 is attached to the outer surface of the main girder 4 with bolts 14 using the bolt holes 7 (see FIG. 7). An end frame 15 is attached between both ends of the frame 13 (in FIG. 5, only the end frame 15 between one end of the side frame 13 is shown), and concrete is put in the steel frame 1. After placing and concrete hardening, the side frame 13 and the end frame 15 were removed.

  As shown in FIG. 6, a surplus frame 16 for forming the surplus portion 11 is attached to the inner surface of the side frame 13 along the side frame 13. As shown in FIG. 7, the thickness of the extra-frame 16 is formed thinner than the thickness of the main girder 4, so that the lower surface of the extra-frame 16 is engaged with the outside of the inner peripheral surface of the main girder 4. To do. The outside of the inner peripheral surface of the main girder 4 is indicated by (a) in FIGS.

  The concrete-filled steel segment is manufactured as described above, but has the following problems.

  In order to accommodate the curved part of the shield tunnel, it was necessary to produce a narrow concrete filled steel segment. That is, it is necessary to approximate the curvature of the curved portion. In FIG. 4, the width of the segment is indicated by W and the height of the segment is indicated by H. For example, when a concrete-filled steel segment having a width of 30 cm is manufactured by the above-described method, the core is too narrow to form a recess 10 that allows a joint plate bolt to be fastened. Installation cannot be performed.

  Therefore, conventionally, as shown in FIG. 5, the main girder 4 on the side of one joint plate 5 a of the steel frame 1 is partitioned by a partition plate 17, and between the one joint plate 5 a and the partition plate 17. As shown in FIG. 8, a foamed polystyrene block 18 having a surplus height as shown in FIG.

  However, there were the following problems.

  (A) Since a part of the block 18 needs to be placed inside the inner peripheral surface (thickness portion) of the main beam 4, step portions 18 a are formed on both upper sides of the block 18. The inner side of the inner peripheral surface of the main girder 4 is indicated by (b) in FIGS. However, since the block 18 is made of polystyrene foam, the stepped portion 18a is easily lost, and as a result, it is difficult to repeatedly use the block 18.

  (B) The attachment position of the partition plate 17 is slightly different for each concrete-filled steel segment. As a result, a gap may be generated between the block 18 and the partition plate 17 depending on the concrete-filled steel segment. In order to solve this problem, it is necessary to prepare the block 18 for each concrete-filled steel segment, which is expensive.

  Accordingly, an object of the present invention is used when connecting segments in a ring shape in the circumferential direction, which can easily cope with the change in the mounting position of the partition plate for each of the concrete-filled steel segments. Another object of the present invention is to provide a concrete-filled steel segment manufacturing jig for forming a space for fastening bolts for joint plates.

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

  The invention according to claim 1 is composed of a steel frame and concrete cast in the steel frame, and the steel frame is welded between a pair of main girders and both ends of the main girders. A pair of joint plates, a skin plate welded to the outer peripheral surface of the main girder, a side frame removably attached to the outer side of the main girder, and a weld between the main girder on one of the joint plates And a partition frame is attached to the inner surface of the side frame along the side frame, and the lower surface of the surplus frame is in contact with the outside of the inner peripheral surface of the main girder In the jig for forming the space for fastening the joint plate bolts when producing the middle-packed steel segment, the slat plate applied to the partition plate and the slat plate are advanced and retracted, A gap adjusting mechanism for adjusting a gap between the joint plate and the baffle plate, Has the same height as the height of the extra-frames and has the same length as the interval between the extra-frames, and the lower part of the bottom plate has the same length as the interval between the main girders. The lower surfaces of both ends of the upper portion of the dam plate are in contact with the inside of the inner peripheral surface of the main girder.

  According to a second aspect of the present invention, in the first aspect of the invention, the distance adjusting mechanism includes a screw rod fixed to a surface of the first coupling plate side of the dam plate, and a screw engagement with the screw rod. And a nut abutting against the inner surface of the one joint plate, wherein the base plate is brought into close contact with the partition plate by turning the nut.

  According to a third aspect of the present invention, in the first aspect of the present invention, the distance adjusting mechanism includes an outer tube fixed to the surface of the one coupling plate side of the dam plate, and a coil spring in the outer tube. And the inner pipe abutting against the inner surface of the one joint plate, and characterized in that the weir plate is brought into close contact with the partition plate by the elastic force of the coil spring.

  According to the present invention, it is possible to easily cope with the change of the attachment position of the partition plate for each segment by configuring the slat plate applied to the partition plate welded between the main girders so as to be able to advance and retreat. It is possible to provide a jig for manufacturing a concrete-filled steel segment that can be used.

It is a schematic perspective view which shows the steel frame in which the jig | tool of this invention was installed. It is a top view which shows the steel frame in which the jig | tool of this invention was installed. It is a front view which shows the steel frame in which the jig | tool of this invention was installed. It is a schematic perspective view which shows the segment made from concrete filling steel. It is a schematic perspective view which shows the steel frame in the case of manufacturing a concrete filling steel segment by the conventional method. It is a rear view which shows a side frame. It is a longitudinal cross-sectional view which shows the attachment structure of the side frame to the main girder in a core position. It is a perspective view which shows the block made from a polystyrene foam. It is a schematic perspective view which shows another space | interval adjustment mechanism.

  An embodiment of a jig for a concrete-filled steel segment according to the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic perspective view showing a steel frame in which the jig of the present invention is installed, FIG. 2 is a plan view showing the steel frame in which the jig of the present invention is installed, and FIG. It is a front view which shows the steel frame in which the jig | tool was installed.

  As shown in FIGS. 1 to 3, the jig of the present invention (hereinafter referred to as “jig A” for convenience of explanation) is used to fasten joint plate bolts when producing concrete-filled steel segments. This is for forming a working space (S).

  Since the concrete-filled steel segment is as described above, it will be briefly described.

  The concrete-filled steel segment is composed of a steel frame 1 and concrete (see FIG. 4) placed in the steel frame 1. The steel frame 1 includes a pair of main girders 4, a pair of joint plates 5 welded between both ends of the main girders 4, a skin plate 6 welded to the outer peripheral surface of the main girders 4, and the main girders 4. A side frame 13 detachably attached to the outside and a partition plate 17 welded between the main beams 4 on the side of one joint plate 5a are provided. The extra frame 16 is attached to the inner surface of the side frame 13 along the side frame 13, and the lower surface of the extra frame 16 is configured to be in contact with the outer side of the inner peripheral surface of the main girder 4.

  In addition, the same numbers as those in FIG.

  The jig A of the present invention includes a slat plate 19 applied to the partition plate 17 and a distance adjusting mechanism 20 that moves the slat plate 19 forward and backward to adjust the distance between one joint plate 5 a and the slat plate 19. ing.

  The upper portion of the weir plate 19 has the same height as the extra frame 16 and the same length as the interval between the extra frames 16 and 16. The lower portion of the weir plate 19 has the same length as the distance between the main girders 4 and 4, and the lower surfaces of both ends of the upper portion of the weir plate 19 abut on the inner side (b) of the inner peripheral surface of the main girder 4. The lower surfaces at both ends of the upper portion of the weir plate 19 are shown in FIG.

  The interval adjusting mechanism 20 includes a screw rod 21 fixed to the surface of the joint plate 19 on the one joint plate 5a side, and a nut 22 that is screwed with the screw rod 21 and contacts the inner surface of the one joint plate 5a. ing. By rotating the nut 22, the screw rod 21 advances and retreats, so that the dam plate 19 also advances and retreats. As a result, even if the attachment position of the partition plate 17 changes for each segment, the space for fastening operation (S) of the joint plate bolt can always be formed by the single interval adjusting mechanism 20.

  In order to produce a concrete-filled steel segment using the jig A of the present invention, the jig A of the present invention is installed between one joint plate 5a and the partition plate 17, as shown in FIG. Then, the nut 22 is rotated by hand or the like, and the weir plate 19 is brought into close contact with the partition plate 17.

  Thus, when the jig A of the present invention is installed, concrete is placed in the steel frame 1 between the dam plate 19 and the end frame 15. And after concrete hardening, the jig | tool A of this invention, the side frame 13, and the edge part frame 15 are removed.

  In the space (S) formed between one joint plate 5a and the partition plate 17, after assembling the segment ring (after bolting) at the time of shield tunnel construction, concrete is placed.

  As described above, according to the present invention, unlike the conventional polystyrene foam block 18, there is no fear of a defect, so that it can be used repeatedly.

Moreover, according to this invention, since the dam 19 can be moved freely, even if the attachment position of the partition plate 17 changes for every segment, this can be coped with easily.
As a result, the production efficiency of the concrete-filled steel segment is improved and the quality is stabilized.

  In addition, the space | interval adjustment mechanism 20 may be other than the structure by a screw rod and a nut. For example, as shown in FIG. 9, the outer tube 23 is fixed to the dam plate 19, and the inner tube 25 is inserted into the outer tube 23 via a coil spring 24. A structure in which the plate 19 is in close contact with the partition plate 17 may be employed.

  The inner tube 25 does not necessarily have to be a hollow tube body, and a so-called solid column body can be used functionally. Further, the material does not have to be made of steel, but may be made of metal such as aluminum or hard plastic.

  Further, in order to increase the elastic force of the coil spring 24, although not shown, a plurality of interval adjusting mechanisms 20 may be provided on the dam plate 19 in parallel.

A: Jig of the present invention 1: Steel frame 2: Concrete 3: Reinforcement material (vertical rib)
4: Main girder 5: Joint plate 5a: One joint plate 6: Skin plate 7: Bolt hole 8: Bolt hole 9: Recessed part (bolt box)
10: recessed part 11: extra part 12: core 13: side frame 14: bolt 15: end part frame 16: extra part frame 17: partition plate 18: block 19: baffle plate 20: interval adjusting mechanism 21: screw rod 22: Nut 23: Outer tube 24: Coil spring 25: Inner tube

Claims (3)

It is composed of a steel frame and concrete cast in the steel frame, and the steel frame includes a pair of main girders, a pair of joint plates welded between both ends of the main girders, and A skin plate welded to the outer peripheral surface of the main girder, a side frame detachably attached to the outside of the main girder, and a partition plate welded between the main girder on one of the joint plates, A surplus frame is attached to the inner surface of the side frame along the side frame, and the lower surface of the surplus frame is used when manufacturing a concrete-filled steel segment that abuts the outside of the inner peripheral surface of the main girder. In a jig for forming a space for fastening work of a bolt for a joint plate,
A partition plate applied to the partition plate, and a spacing adjusting mechanism that adjusts a spacing between the one joint plate and the projection plate by moving the partition plate forward and backward. The height is the same as the height of the filling frame, and has the same length as the interval between the extra-frames, and the lower portion of the slat has the same length as the interval between the main girders, A jig for producing a concrete-filled steel segment, characterized in that the lower surfaces of both ends of the upper part of the plate are in contact with the inside of the inner peripheral surface of the main girder.   The spacing adjustment mechanism includes a screw rod fixed to the surface of the one coupling plate side of the dam plate, and a nut that is screwed with the screw rod and contacts the inner surface of the one coupling plate, 2. The jig for producing a concrete-filled steel segment according to claim 1, wherein the partition plate is brought into close contact with the partition plate by turning a nut. 3.   The spacing adjusting mechanism includes an outer tube fixed to the surface of the one coupling plate side of the dam plate, and an inner surface that contacts the inner surface of the one coupling plate inserted into the outer tube via a coil spring. 2. The jig for manufacturing a concrete-filled steel segment according to claim 1, wherein the jig is made of a tube, and the partition plate is brought into close contact with the partition plate by an elastic force of the coil spring.

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