JP2011177993A - Form for centrifugal molding of concrete segment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently produce a concrete segment. <P>SOLUTION: A form 10 for the centrifugal molding of the concrete segment which is fitted attachably/detachably to the inside of the centrifugal drum 33 of a centrifugal molding apparatus 30 includes: a pair of circular members 11 and 11; a cylindrical body 22 in which a plurality of outer frame bodies 13 in the shape of an arc are connected in the circumferential direction in a separable state, and the circular members 11 and 11 are connected coaxially and separably to both ends in the axial direction, respectively, and a plurality of partition plates 14 which extend to the inside of the cylindrical body 22 from the boundary part of an outer frame body 13 in the cylindrical body 22 and are arranged to suspend the space between the inner surfaces of the circular members 11 and 11. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a mold for centrifugal molding of a concrete segment.

  Conventionally, there is a centrifugal molding method as one of the manufacturing methods of a reinforced concrete (RC) segment applied in the shield method.

  For example, as one of the centrifugal molding methods, a plurality of ring partition members are disposed in the rotation axis direction inside the centrifugal mold, and a plurality of segment partition members are disposed in the circumferential direction. There is a type in which a segment of a plurality of rings is centrifugally molded by placing concrete while rotating the ring (for example, Patent Document 1).

  Alternatively, a pair of annular end frames that are detachably attached to both end portions of the inner diameter surface of the centrifugal mold of the centrifugal molding apparatus are provided, and a segment mold frame is disposed between the end frames, so that the arc-shaped outer peripheral surface and There are some which form a steel plate reinforcing type segment whose side surface is covered and integrated by a steel plate covering frame (for example, Patent Document 1, FIG. 2, FIG. 3, FIG. 4).

  In addition, the segment molding unit has a plurality of partition plates spanned between the end frames described above, and drives the centrifugal molding device to rotate the centrifugal molding die at a required speed, while supplying concrete from the outside with a concrete supply nozzle. Fill (for example, Patent Document 2, FIGS. 9, 10, and 11).

JP 2008-162273 A JP 2008-284751 A

  However, in the method in which concrete is directly placed in the centrifugal mold or the centrifugal mold in Patent Document 1 and Patent Document 2 as described above, the concrete is removed from the centrifugal mold until the concrete is sufficiently cured. The mold could not be removed from the centrifugal mold.

  This invention is made | formed in view of the said problem, and makes it a subject to provide the technique which can manufacture a concrete segment efficiently.

  The present invention employs the following means in order to solve the above-described problems.

That is, one aspect of the present invention is a mold for centrifugal molding of a concrete segment that is detachably mounted in a centrifugal drum of a centrifugal molding device,
A pair of circular members;
A cylindrical body in which a plurality of arc-shaped outer frame bodies are connected in the circumferential direction in a separable state, and each of the pair of circular members is coaxially and separably connected to both ends in the axial direction Body,
It includes a plurality of partition plates that extend from the boundary portion of the outer frame body in the cylindrical body to the inside of the cylindrical body and are arranged so as to span between the inner surfaces of the pair of circular members.

According to one aspect of the present invention, a pair of circular members are coaxially connected to a cylindrical body, and a mold for centrifugal molding of a concrete segment can be assembled by disposing a partition plate. The outer frame members may be connected directly or via a partition plate.

  After that, the assembled mold for centrifugal molding is placed in the centrifugal drum, the concrete is placed while rotating the centrifugal drum, and the space surrounded by the circular member, the outer frame body and the partition plate is filled with the concrete. A concrete segment is manufactured. When the concrete is hardened to some extent, the mold for centrifugal molding can be taken out of the centrifugal drum and the concrete can be cured. Therefore, it is not necessary to pause the centrifugal drum until the concrete is cured. Therefore, the operation rate of the centrifugal drum can be increased and the manufacturing efficiency of the segment can be increased.

  In the assembled centrifugal mold, an RC segment can be obtained by placing concrete in a space surrounded by a circular member, an outer frame, and a partition plate.

  In the centrifugal mold according to the present invention, a stiffener may be formed on the outer surface of the outer frame body. In this way, sufficient strength can be given to the cylindrical body, and thus the formwork.

  For example, the stiffener includes a first flange portion formed at both end portions in the length direction of the outer frame body, a second flange portion formed at both end portions in the width direction of the outer frame body, and the outer frame body. At least one rib erected on the outer surface of the first flange portion, and the first flange portion is connected to another adjacent outer frame body directly or via a partition plate, and the second flange portion is The pair of circular members may be connected to the circular member by a fixing means in contact with the inner surfaces of the pair of circular members.

  Further, in the centrifugal mold according to the present invention, the partition plate is interposed between outer frame bodies that are connected when the cylindrical body is formed, and is integrally connected to the outer frame body by a connector between the outer frame bodies. A part of the partition plate may extend to the inside of the cylindrical body. If it does in this way, in the formation (assembly) process of a cylindrical body, a partition plate can be arrange | positioned in an appropriate position and the assembly of a formwork can be simplified.

  Further, the centrifugal mold according to the present invention can be configured such that the inner diameter center of each outer frame body in the cylindrical body is eccentric by a predetermined amount in the radial direction from the center of the cylindrical body. If it does in this way, the roundness of a plurality of concrete moldings taken out from the formwork can be raised.

  The centrifugal mold according to the present invention is formed in a cylindrical shape having one axial end surface formed by a plane orthogonal to the axis and the other axial end surface formed by a plane obliquely intersecting the axis. The one end surface may further include a spacer attached coaxially to the inner surface of one of the pair of circular members. By including such a spacer, a tapered segment ring can be produced.

In another aspect of the present invention, a pair of circular members are coaxially separated at both ends in the axial direction of a cylindrical body formed by connecting a plurality of arc-shaped outer frames in a circumferential direction in a separable state. A mold for centrifugal molding that is connected to each other and extends from the boundary portion of the outer frame body of the cylindrical body to the inside of the cylindrical body and has a plurality of partition plates arranged so as to span between the inner surfaces of the pair of circular members. Assemble the frame
The centrifugal mold is placed in a centrifugal drum of a centrifugal molding device,
Concrete is placed in the mold for centrifugal molding while rotating the centrifugal drum,
After the placing, the centrifugal mold is removed from the centrifugal drum and the concrete is cured,
A concrete segment manufacturing method including disassembling the centrifugal mold.

  According to the present invention, segments can be manufactured efficiently.

The example of the segment ring comprised by the segment manufactured using the mold for centrifugal molding which concerns on embodiment is shown. The example of the segment which comprises the segment ring shown in FIG. 1 is shown. It is decomposition | disassembly explanatory drawing of the mold for centrifugal molding of the concrete segment which concerns on embodiment. FIG. 3A is a diagram showing the outer surface of the circular member, and FIG. 3B is a diagram showing the inner surface of the circular member. FIG. 4A is a front view (a view seen from the axial direction) of a cylindrical body obtained by connecting a plurality of back plates, and FIG. 4B is a view showing a side surface of the cylindrical body. FIG. 5A is a front view of the partition plate, and FIG. 5B is a right side view of the partition plate. 6 is a view showing an example of a joint member for forming an inter-piece joint, and FIG. 6 (A) is a side view showing a state in which the joint member is attached to the partition plate 14, and FIG. ) Is a view of the partition plate 14 to which the joint member is attached as viewed from above, and FIG. 6C is a view showing a junction box included in the joint member. It is the figure which looked at the centrifugal molding apparatus of the state in which the several mold for centrifugal molding was installed from the side surface. It is the figure which looked at the centrifugal molding apparatus shown in FIG. 7 from the front. FIG. 9 is a diagram illustrating another embodiment of the centrifugal mold according to the embodiment, and is a diagram schematically illustrating a state in which a spacer is attached in the mold. FIG. 10 is an explanatory diagram of a cylindrical body forming method.

  Hereinafter, a concrete segment centrifugal mold and a concrete segment manufacturing method using the centrifugal mold according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1A and FIG. 1B show examples of concrete segments (hereinafter simply referred to as “segments”) manufactured using a mold for centrifugal molding. FIG. 1A shows a cylindrical segment ring 1, and FIG. 1B shows one of the segments (segment pieces) 2 that form the segment ring 1 shown in FIG. 1A.

  In FIG. 1A, the segment ring 1 is formed of five segments 2A, 2B, 2C, 2D, and 2E manufactured by a centrifugal molding method (hereinafter, when the segments 2A to 2E are not distinguished, “Segment 2 The segment 2 is formed in an arc shape having two circumferential end faces 2a and 2b.

Further, insert nuts 37 and 37 (see FIG. 6) for connecting the segments 2 to each other in the circumferential direction of the segment 2 are embedded on one end surface 2b side of each segment 2, and the end surface 2b has an insert The nut holes 2c and 2c of the nuts 37 and 37 are opened. On the other hand, on the other end face 2a side of the segment 2, through holes 2g and 2g are formed through which the bolts (not shown) for connecting pieces inserted into the nut holes 2c and 2c are inserted. Through hole 2
g and 2g communicate with recesses 2d and 2d provided on the end surface 2a side of the segment 2, respectively. In this way, the bolts are inserted into the through holes 2g and 2g from the recesses 2d and 2d, inserted into the nut holes 2c and 2c provided in the end surface 2b of the other segment 2, and screwed into the insert nuts 37 and 37. By doing so, the segments 2 are connected in the circumferential direction (connection between pieces).

  Each end face in the width direction of the segment 2 (the axial direction of the segment ring 1) is provided with a plurality of holes 2e for connecting the segment ring 1 in the axial direction with an inter-ring joint (not shown). Yes. Further, a sealing member (for example, a ring-shaped rubber or a rubber cover) for water stop is hung over the entire side surface of the segment 2 on the circumferential end faces 2a and 2b and the widthwise end faces. For this purpose, a groove 2f is formed.

  Such a segment 2 (segment ring 1) is applied to tunnel construction using a shield method. For example, it is applied in the construction of water and sewage or common ditch. In tunnel construction, the segment rings 1 are assembled by connecting the segments 2A to 2E in the circumferential direction with bolts (inter-segment joints). Each segment ring 1 is arranged so that the outer peripheral surface of the segment ring 1 is in contact with the inner peripheral surface of the excavated tunnel, and a bolt (inter-ring joint) (not shown) is used in the axial direction of the tunnel (segment ring 1) using the hole 2e. ). The plurality of segment rings 1 connected in this way are used as pipes for water supply in water and sewage systems and common grooves.

  FIG. 1A shows segment groups 2A to 2E forming an ABK type segment ring 1 as an example of the segment ring. However, other types of tapered segments (for example, curved-corresponding type tapered segment rings formed of trapezoidal and parallelogram segment pieces) are manufactured by using the centrifugal mold 10 of the present embodiment. It is also possible. It is also possible to manufacture a segment ring composed of a rectangular segment group in which the end face of each segment 2 is parallel to the axis of the segment ring 1. In short, the mold 10 can be used to manufacture segment rings formed from segment pieces of various shapes.

  FIG. 2 is an exploded view of a centrifugal molding form 10 (hereinafter simply referred to as “form form 10”) used to manufacture a plurality of segments 2 (2A to 2E) as shown in FIG. FIG. FIG. 3A is a diagram showing the outer surface of the circular member, and FIG. 3B is a diagram showing the inner surface of the circular member. FIG. 4A is a front view (a view seen from the axial direction) of a cylindrical body obtained by connecting a plurality of back plates, and FIG. 4B is a view showing a side surface of the cylindrical body. FIG. 5A is a front view of the partition plate, and FIG. 5B is a right side view of the partition plate.

  In FIG. 2, the mold 10 roughly includes a pair of circular members (ring members) 11, 11, a plurality of back plates 13 that are a plurality of arcuate outer frames, and a plurality of partition plates 14. Prepare.

  The pair of circular members 11 and 11 have the same configuration. The circular member 11 is a metal (for example, steel) flat plate formed in a circular ring shape. The circular member 11 has an outer surface 11a and an inner surface 11b. On the inner surface 11b, an annular convex portion 15 for forming the groove 2f (FIG. 1B) of the segment 2 is formed concentrically with the circular member 11 (FIG. 3B).

  Each circular member 11 is formed with a plurality of through holes 16 at a predetermined interval on a concentric circle with the outer edge of the circular member 11. Each through hole 16 is used as a bolt hole for fixing the back plate 13 to the circular member 11 with a bolt 17 as a fixing means and a nut (not shown).

  Further, each circular member 11 is formed with a plurality of through holes 18 for forming the holes 2 e of the segment 2 inside the through holes 16. The through hole 18 is also formed on the concentric circle of the circular member 11. A buried hardware for a joint between rings is installed using the through hole 18. The number of through holes 16 can be set as appropriate in order to obtain a good connection state with the back plate 13. The number of through holes 18 can be set as appropriate according to the number of holes 2 e formed in the segment 2. It can be set.

  After the assembly, the mold 10 is installed in the centrifugal drum 33 of the centrifugal molding device 30 (see FIG. 8). For this reason, the outer diameter of the pair of circular members 11, 11 has a size corresponding to the inner diameter of the centrifugal drum.

  Further, the ring member 11 is formed so that the ring width length L (FIG. 3B) of the circular member 11 is not less than the thickness of the segment 2. Note that the circular member 11 in the present embodiment has a circular member 11 so that a device such as a concrete supply nozzle can pass through the mold 10 when the mold 10 is disposed in the centrifugal drum 33. A central portion of the ring is greatly opened to form a ring shape. Therefore, the shape and number of the openings of the circular member 11 can be appropriately set in view of the situation when the centrifugal mold is placed in the centrifugal drum.

  FIG. 2 shows a plurality of back plates 13A to 13E for forming the ABK type segment ring 1 shown in FIG. 1A. Hereinafter, when the back plates 13 </ b> A to 13 </ b> E are not distinguished, they are expressed as the back plate 13.

  The back plate 13 includes a metal (for example, steel) substrate 13a formed in an arc shape (at least an inner surface has a cylindrical peripheral surface), and a stiffener 13b that is a reinforcing member of the substrate 13a. The stiffener 13b is provided with flanges 19 and 19 standing substantially perpendicularly to the substrate 13a from the outer edge in the length direction of the substrate 13a to the outside, and substantially perpendicular to the outer side from the outer edge in the width direction of the substrate 13a. And upright flanges 20 and 20.

  The flanges 19 and 19 each have a through-hole 23 at substantially the center of each region partitioned by the ribs 21 and 21 (FIG. 4B). The through hole 23 is used as a bolt hole for connecting the back plates 13 to each other.

  Moreover, the flanges 20 and 20 have a plurality of through holes 24 corresponding to the through holes 16 of the circular member 11 (FIG. 4A). The through hole 24 is a bolt hole through which the bolt 17 is inserted, and is used to fix the back plate 13 to the circular member 11.

  Further, the stiffener 13b includes ribs 21 and 21 that are provided substantially vertically on the outer surface of the substrate 13a. The ribs 21 and 21 extend in the length direction of the substrate 13a in a state parallel to the flanges 20 and 20, and both ends of the ribs 21 and 21 are connected to the flanges 19 and 19, respectively. The ribs 21 and 21 are formed between the flange 20 and the rib 21 and between the ribs 21 at substantially equal intervals. However, these intervals can be set as appropriate. The number of ribs 21 can also be set as appropriate. Furthermore, ribs extending in the width direction of the substrate 13a can be further provided on the outer surface of the substrate 13a in the width direction of the substrate 13a. In this way, the back plate 13 has the stiffener 13b, whereby the rigidity of the back plate 13 is increased, and as a result, the strength of the cylindrical body 22 as a cylindrical body, which will be described later, and thus the formwork 10 can obtain a suitable strength. Can do.

The back plates 13A to 13E are connected in the longitudinal direction to form a cylindrical body (cylindrical body 22) as shown in FIG. As shown in FIG. 2, when connecting the back plates 13, the flanges 19 of the two back plates 13 to be connected are opposed to each other, the partition plate 14 is disposed between the flanges 19, and the bolt 17 </ b> A is connected to each flange. The bolts 17 </ b> A are tightened by the nuts 26 (FIG. 5B) in a state in which the through holes 23 corresponding to the through holes 23 provided in the partition plate 14 are inserted. In this way, the back plates 13 are connected.

  By connecting the back plates 13 to each other, the partition plate 14 is interposed between the flanges 19 of the back plate 13 and is sandwiched between the flanges 19 by bolting using the bolts 17A. When the partition plates 14 are interposed between the back plates 13, the back plates 13 are connected to each other in the length direction, whereby a cylindrical body 22 as shown in FIG. 4A can be formed. In the cylindrical body 22, each partition plate 14 interposed between the back plates 13 is in a state having an extending portion 14 a extending toward the inside of the cylindrical body 22.

  The mold 10 can be assembled by fixing the circular member 11 with the bolts 17 on both sides of the cylindrical body 22. That is, the through holes 24 provided in the axial direction of the cylindrical body 22 are aligned with the through holes 16 of the circular member 11, and the bolts 17 are inserted into the through holes 16 and 24 from the outer surface 11 a side of the circular member 11. Then, each circular member 11 can be fixed to the cylindrical body 22 by fitting a nut (not shown) to the tip of the bolt 17 protruding from the through hole 24 and tightening it. At this time, the circular members 11 and 11 are coaxial (concentric) with the cylindrical body 22. In a state where the circular members 11 and 11 are fixed to the cylindrical body 22, a space surrounded by the inner surface of the back plate 13, the inner surfaces 11b and 11b of the circular members 11 and 11, and the partition plate 14 (extending portion 14a) is a segment. Make a space to fill the concrete for molding. Here, by filling the concrete with the mold 10 rotating about the axis, a cylindrical concrete molding as shown by a broken line in FIG. 4A can be obtained. Here, the cylindrical concrete molding can be separated with the partition plate 14 as a boundary. Therefore, the segments 2A to 2E forming the segment ring 1 as shown in FIG. 1A can be obtained by dividing the concrete molding with the partition plate 14 as a boundary.

  FIG. 5 is a diagram showing details of the configuration of the partition plate 14. FIG. 5 (A) is a view showing the front of the partition plate 14, and FIG. 5 (B) is an explanatory view showing an AA cross section in FIG. 5 (A). FIG. 5A shows a state in which the partition plate 14 arranged in alignment with the left end of the back plate 13B shown in FIG. 4A is viewed from the left side of the sheet of FIG. 4A. It is shown.

  As shown in FIGS. 5A and 5B, the partition plate 14 has the same width and length as the back plate 13, and the lower end portion of the partition plate 14 is made to coincide with the lower end of the flange 19 of the back plate 13B. And each through-hole 25 corresponds with each through-hole 23 of the flange 19. And the part above the flange 19 becomes the extension part 14a.

  When the back plate 13 is connected, as shown in FIG. 5B, the flanges 19 of the two back plates 13 to be connected (the back plate 13B and the back plate 13C in FIG. 5B) are formed on both sides of the partition plate 14. , 19 are brought into contact with each other. In this state, the bolt 17A is passed through the through hole 23, the through hole 25, and the through hole 23 from one side (the back plate 13B side in FIG. 5B), and a nut is attached to the tip of the bolt 17A protruding to the other side. Fit 26 and tighten. Accordingly, the partition plate 14 is integrally connected to the back plate 13 with the partition plate 14 being sandwiched between the back plates 13. In this state, a portion higher than the height of the flange 19 of the partition plate 14 becomes an extending portion 14 a that extends to the inside of the cylindrical body 22 in the cylindrical body 22.

  In this way, the partition plate 14 is interposed between the back plates 13 and is integrally connected to the back plate 13 with the bolts 17 </ b> A and nuts 26, which are connecting tools, so that the partition plate 14 can be easily arranged on the cylindrical body 22. And the assembly of the mold 10 can be facilitated.

  The extending portion 14 a functions as a member that defines the boundary of the segment 2 formed by the mold 10. That is, in the example shown in FIG. 5B, the segment 2B is formed on the back plate 13B side, and the segment 2C is formed on the back plate 13C side.

  At the lower part of the extending portion 14a, linear convex portions 14b extending in the width direction of the partition plate 14 are formed on both sides of the partition plate 14 (FIG. 5B). Each convex portion 14 b is provided to form a sealing groove 2 f as shown in FIG. 1B on the circumferential end surface of the segment 2. Grooves 14c and 14c are formed at the ends of the respective convex portions 14b, and the convex portions 15 (FIG. 2) provided on the inner surface 11b of the circular member 11 are inserted into the respective grooves 14c.

  Further, nut holes 2c, 2c, holes 2g, 2g, and recesses 2d at both ends of the segment 2 are supported at the intermediate portion of the extended portion 14a, that is, a joint member for forming a joint between pieces. Through holes 14d and 14d are formed. Further, the upper end portion of the extending portion 14 a has a protruding portion that extends in a direction substantially perpendicular to the height direction of the partition plate 14, and this protruding portion 14 e forms a joint in the segment 2. Used for.

  FIG. 6 is a diagram illustrating an example of a joint member for forming an inter-piece joint. 6A is a side view showing a state in which the joint member is attached to the partition plate 14, and FIG. 6B is a view of the partition plate 14 to which the joint member is attached as viewed from above. 6 (C) is a view showing a junction box included in the joint member.

  6 (A), 6 (B), and 6 (C), the joint member includes an end surface member 27 and a connection box 28 that are disposed on the back side of the partition plate 14, and an insert nut 37 that is disposed on the front side of the partition plate 14. Is included.

  The end surface member 27 includes a rectangular metal plate (for example, a steel plate) 27a which is a part of the end surface 2a of the segment 2, and four anchor bars 27b extending from the back surface of the metal plate 27a. A through hole 27c serving as a hole 2g of the segment 2 is formed in the approximate center of the metal plate 27a.

  As shown in FIG. 6C, the connection box 28 includes a semi-cylindrical box 28a and a lid 28b. The box body 28a is provided with a hollow portion (concave portion) 28c having an upper opening, and a through hole 28d provided so as to communicate the hollow portion 28c with one axial end surface of the box body 28a. Yes. Further, a nut hole 28e is provided on the upper surface of the box body 28a for fixing the lid body 28b with the bolt 29 in a state where the upper surface of the box body 28a is covered with the lid body 28b.

  The lid body 28b is also provided with a through hole 28f corresponding to the nut hole 28e. The lid body 28b is placed on the upper surface of the box body 28a with the through hole 28f and the nut hole 28e aligned, and the bolt 29 Is inserted through the through hole 28f and screwed into the through hole 28f and the nut hole 28e, so that the lid 28b can be fixed.

  As shown in FIG. 6 (A), when the upper edge of the metal plate 27a of the end face member 27 is in contact with the lower portion of the overhanging portion 14e, the front surface of the metal plate 27a is brought into close contact with the back surface of the partition plate 14. The through hole 27c of the metal plate 27a and the through hole 14d of the partition plate 14 communicate with each other. In this state, the box body 28a is disposed between the anchor bars 27b in a state where the through hole 27c and the through hole 28d are aligned, the bolt 36 is inserted from the hollow portion 28c, and the tip of the bolt 36 is inserted into the through holes 28d, 27c. , 14d and projecting from the front of the partition plate 14. In this state, when the insert nut 37 is screwed and tightened to the tip of the bolt 36, the end face member 27 and the box 28a are sandwiched between the bolt 36 and the insert nut 37 and fixed to the partition plate 14. Become. In such a state, the lid 28b is placed on the box 28a, and the lid 28b is fixed by the bolt 29. In addition, concrete is filled into the mold 10 until it becomes the same height as the upper surface of the overhang | projection part 14 and the cover body 28b in this state.

  Next, the manufacturing method of the segment 2 using the above-mentioned formwork 10 is demonstrated. In this manufacturing method, a plurality of segments 2 (segment pieces) forming a segment ring are molded at a time using a single mold 10 using an existing centrifugal molding apparatus that conforms to the standard of a fume tube having an outer diameter of about 3 m. An example will be described. In addition, the outer diameter of the segment ring 1 manufactured using the formwork 10 of this embodiment is 2-3 m, for example, and the width of the segment 2 is 0.5-1 m.

  First, the mold 10 is assembled. For example, by sandwiching a plurality of partition plates 14 between a plurality of back plates 13 and bolting the back plates 13 together, a cylindrical body 22 as shown in FIG. The mold member 10 can be assembled by fixing the circular members 11 and 11 with bolts 17 and nuts (not shown).

The mold 10 can separate the circular members 11 and 11 and the cylindrical body 22 by removing the plurality of bolts 17. Further, the cylindrical body 22 can be separated into a plurality of back plates 13 (outer frame bodies) by removing the bolts 17A.

  In the assembly process of the mold 10, joint members (end surface member 27, connection box 28) for forming the joint between pieces are fixed to the partition plate 14 by the above-described method (FIG. 6A). Moreover, the metal fitting for ring joints is installed in the concrete placement space using the through holes 18 of the circular members 11 and 11. Furthermore, a reinforcing bar can be arranged in a space surrounded by the circular members 11, 11, the partition plate 14 and the back plate 13. Further, a concrete release agent is applied to a portion forming the concrete placement space, that is, the inner surface of the substrate 13a, the inner surface 11b of the circular member 11, and the partition plate 14 (extending portion 14a), or water is stopped between these members. Or can be crafted. In this way, a concrete placement space with high water tightness can be formed. In the assembly process of the mold 10, at least the number of molds 10 that can be arranged in the centrifugal drum 33 (FIG. 8) is assembled at a time.

  7 is a side view of the centrifugal molding apparatus 30 to which the mold 10 is applied, and FIG. 8 is a front view of the centrifugal molding apparatus 30 shown in FIG. As shown in FIGS. 7 and 8, the centrifugal molding apparatus 30 includes rollers 31 and 32 arranged in parallel, and a cylindrical centrifugal drum 33 placed on the rollers 31 and 32.

  A cylindrical internal space 34 for installing the mold 10 is provided in the centrifugal drum 33, and the mold 10 is coaxial with the rotation axis of the centrifugal drum 33 in the centrifugal drum 33. Removably attached. Further, as shown in FIG. 7, a plurality of molds 10 (three in FIG. 7) are arranged at a time in the centrifugal drum 33.

  The roller 31 is connected to a drive device (for example, a motor) (not shown), and rotates by obtaining power from the drive device via a chain or a belt. The roller 32 is an auxiliary roller. As the roller 31 rotates, the centrifugal drum 33 can rotate at a predetermined speed. During the rotation of the centrifugal drum 33, the concrete is poured into the mold 10 from the concrete supply device 35 disposed in the internal space 34 of the centrifugal drum 33. As a result, the concrete is filled (placed) in the concrete placement space provided in the mold 10, and centrifugal compaction is performed.

  When a predetermined time has elapsed since the concrete is placed, the rotation of the roller 31, that is, the centrifugal drum 33 is stopped, and the concrete finish around the partition plate 14 of each mold 10 is performed. At this time, concrete finishing can be performed using the upper surface of the overhanging portion 14e of the partition plate 14 and the upper surface of the lid body 28b as a ruler, and the concrete finishing can be easily performed.

  Thereafter, each mold 10 is removed from the centrifugal drum 33 and left for a predetermined time for curing. When each mold 10 is taken out from the centrifugal drum 33, a plurality of pre-assembled molds 10 can be immediately placed on the centrifugal drum 33 and the next placing step can be performed.

  When curing is completed, the mold 10 is disassembled to perform demolding work. At this time, the circular members 11 and 11 are separated from the cylindrical body 22 by removing the plurality of bolts 17 from the mold 10. Furthermore, the recessed part 2d of the segment 2 can be formed by removing the cover body 28b. The cylindrical body 22 is separated into the plurality of back plates 13 by removing the bolts 36 (FIGS. 6A and 6B) using the recess 2d (hollow portion 28c) and extracting the plurality of bolts 17A. At this time, the cylindrical concrete molding formed inside the cylindrical body 22 is separated with the partition plate 14 as a boundary. Thereby, the cylindrical concrete molding is easily divided into five pieces.

  Then, by removing the back plate 13 and, in some cases, the partition plate 14 from each piece, a plurality of segments 2A to 2E for forming the segment ring 1 as shown in FIG. 1A are obtained. Moreover, a finishing process is performed after the decomposition | disassembly into several pieces. In this finishing step, the end face member 27 is left at the end of the segment 2, and the end face 2 a of the segment 2 can be finished flat with respect to the front face of the end face member 27.

  According to the above-described embodiment, the mold frame 10 includes a plurality of back plates 13 (outer frame bodies) that form the cylindrical body 22 and circular members 11 and 11 that are fixed coaxially to both sides of the cylindrical body 22. In addition, the cylindrical body 22 includes a partition plate 14 sandwiched between the back plates 13, and the outer surface of the segment 2 is formed by the back plate 13 (substrate 13 a). That is, since the surface of the inner space 34 of the centrifugal drum 33 is not used as a part of the mold, the mold 10 is taken out from the centrifugal drum 33 before the curing is completed, and the centrifugal molding device 30 is used for the next segment production. Can be used. That is, the downtime of the centrifugal molding device 30 can be shortened and the operation time can be lengthened. Thus, if a large number of molds 10 are prepared in advance, the number of segments that can be manufactured per predetermined time can be increased.

  Further, since the stiffener 13b is formed on the back plate 13 which is the outer frame body, the cylindrical body 22 has sufficient rigidity, and the circular members 11 and 11 are connected by the cylindrical body 22, thereby providing sufficient rigidity. The mold 10 can be formed. That is, it is not necessary to connect the circular members 11 and 11 with a joint member. Thereby, the number of parts of the mold 10 is reduced, and assembly and disassembly are easy.

  Further, the pair of circular members 11, 11, the plurality of back plates 13, and the plurality of partition plates 14 constituting the mold 10 can be repeatedly used. For this reason, since the main steel materials required for the manufacture of the segment 2 are the end surface members 27, the steel material cost required for the manufacture of the segment 2 can be suppressed. Therefore, since the formwork cost and the steel material cost can be suppressed, the segment 2 can be created at a low cost.

  Moreover, in this embodiment, it is comprised so that all the segment pieces 2A-2E which form the segment ring 1 may be manufactured with one mold frame 10, Furthermore, the axial direction length of the centrifugal drum 33 is considered. The length in the width direction of the segment 2 is determined so that the plurality of molds 10 can be installed. Thereby, the manufacturing efficiency of the segment ring 1 can be improved.

  Furthermore, according to this embodiment, the following problems that the above-described Patent Documents 1 and 2 have can be solved.

  (1) The steel material of the formwork remains on the five surfaces (back surface, four side surfaces) of the product (segment), and the product price becomes high.

  (2) Water tightness of the placement space is difficult to obtain, and water (Mizumi) tends to remain on the product surface.

  That is, for the above problem (1), the steel material exposed on the surface of the segment 2 is only the end face member 27 serving as a piece-to-piece joint, so the amount of steel material used for the segment 2 can be reduced. The unit price of segment 2 can be lowered. Moreover, with respect to the said subject (2), the placement space with high water-stopping property can be formed by giving a water-stopping work to the joint (joining part) between the members of the mold 10.

  Furthermore, this embodiment can perform the following improvements. FIG. 9 is a diagram illustrating another embodiment of the centrifugal mold according to the embodiment, and is a diagram schematically illustrating a state in which a spacer is attached in the mold. FIG. 9 is a top view of the state in which the mold 10A shown in FIG. 2 is assembled, the spacer SP is installed in the mold 10A, and the back plates 13A, 13D, and 13E are removed for explanation. .

  As shown in FIG. 9, the spacer SP has an outer shape obtained by obliquely cutting a cylindrical body, and is formed using a steel material. The spacer SP may be integrally formed using a steel material, or may be formed by assembling a plurality of divided pieces.

  One end surface of the spacer SP in the axial direction is formed as a ring-shaped plane orthogonal to the axis, and the other end surface is a ring-shaped plane that obliquely intersects the axis. One end surface of the spacer SP is fixed to the one inner surface 11b of the circular member 11 coaxially, for example, by welding. However, you may make it fix using a volt | bolt etc.

  Although not shown, the spacer SP has a plurality of through holes communicating with the through holes 18 (FIG. 2) of the circular member 11, and embedded metal for the inter-ring joint is installed using each through hole. However, instead of the through hole, a hole is provided on the other end surface of the spacer SP at a position that is collinear with the through hole 18 in the axial direction, and the embedded hardware is installed using the hole. good.

  Although not shown, an annular convex portion corresponding to the annular convex portion 15 for forming the groove 2f (FIG. 1B) of the segment 2 is formed on the other end face of the spacer SP. The outer peripheral surface shape of the spacer SP is formed in accordance with the inner peripheral surface shape of the cylindrical body 22, and the outer diameter of the spacer SP is formed to match the inner diameter of the cylindrical body 22. Further, the inner diameter of the spacer SP is formed in accordance with, for example, the inner diameter of the circular member 11, and the thickness of the spacer SP is thicker than the thickness of the segment to be formed (shown by a one-dot chain line in FIG. 9).

  By applying such a spacer SP, a segment ring having one end face inclined with respect to the axis can be manufactured by the mold 10. Such a segment ring is used to install a pipe in accordance with a curved portion (curve) of a tunnel. Since the spacer SP is attached to the circular member 11 by simple welding, it can be easily detached from the circular member 11 and can be reused.

Further, the cylindrical body 22 (tubular body) described in the embodiment can be configured as follows. In forming the cylindrical body 22, the inner diameter center of each back plate 13 (the center of a circle having an arc of the inner surface of the back plate 13 as a part of the circumference) and the center of the cylindrical body 22 (the rotation center of the mold 10) Since the partition plate 14 is sandwiched between the back plates 13, when trying to make a circular shape by contacting the ends of a plurality of concrete moldings (segment pieces) taken out from the mold 10, Since the peripheral length is insufficient by the thickness of the partition plate 14, the end face shape may not be circular but may be petal-like.

  FIG. 10 shows a method for forming a cylindrical body. FIG. 10 illustrates a cylindrical body 22 for producing a segment ring composed of a plurality of segments 2 (segment pieces) divided into four at 90 °. As shown in FIG. 10, when the cylindrical body 22 is formed, the inner diameter center 01 of each back plate 13 is retracted (eccentric) by a predetermined amount from the center 0 (0, 0) of the cylindrical body 22 in a radial direction. In the state, it connects with the partition plate 14 in between. Specifically, the positions of the partition plates 14 are fixed, and two lines connecting the centers of the two partition plates 14 and the center 0 of the cylindrical body 22 (x-axis and y-axis in the example of FIG. 10) are equal. The inner diameter center 01 (x, y) of the back plate 13 recedes equally in both directions in the x and y directions on the dividing line L1, and the circumferential direction of a plurality of concrete moldings (segment pieces) taken out from the mold 10 The amount of retreat (the amount of eccentricity) is determined so that the total length matches the circumference of the segment ring to be manufactured. Thus, by forming the cylindrical body 22, the roundness when assembling a plurality of concrete moldings (segment pieces) taken out from the mold 10 can be increased.

  Further, when the back plates 13 are connected with the partition plate 14 interposed therebetween, each back plate 13 is retracted from the center of the cylindrical body 22 by an eccentric amount, so that the back plate 13 is retracted outward from the outer end portion of the partition plate 14. It is made to the state. Thus, by providing the gap I between the back plates 13 to be connected, it is possible to facilitate the work of disassembling the mold 10 and taking out the concrete molding. However, the present invention includes both the case where the center of the inner diameter of the back plate 13 is made coincident with the center of the cylindrical body 22 (the center of rotation of the mold 10) and the case where the center is made eccentric.

SP ... Spacer 1 ... Segment ring 2 ... Segments 2a, 2b ... End faces 2c, 2c in the circumferential direction ... Nut holes 2d, 2d ... Recesses 2e ... Hole 2f ... Groove 2g ... hole 10 ... centrifugal mold 11,11 ... circular member 11a ... circular member outer surface 11b ... circular member inner surface 13,13A-13E ... back plate (outer frame body)
13a ... Substrate 13b ... Stiffener 14 ... Partition plate 14a ... Extension 14b ... Convex 14c ... Groove 14d, 25 ... Through hole 15 ... Convex 16 18: Circular member through-holes 17, 17A ... Bolt 19 ... Flange (first flange)
20 ... Flange (second flange)
21 ... Ribs 23, 24 ... Through holes 26 ... Nuts 27 ... End face members 27a ... Metal plates 27b ... Anchor bars 28 ... Connection boxes 28a ... Box bodies 28b ..Cover body 28c ... hollow part (concave part)
28d, 28f ... through hole 28e ... nut hole 29 ... bolt 30 ... centrifugal molding device 31,32 ... roller 33 ... centrifugal drum 34 ... internal space 35 ... concrete Supply device 36 ... Bolt 37 ... Insert nut

Claims (7)

A mold for centrifugal molding of a concrete segment that is detachably mounted in a centrifugal drum of a centrifugal molding device,
A pair of circular members;
A cylindrical body in which a plurality of arc-shaped outer frame bodies are connected in the circumferential direction in a separable state, and each of the pair of circular members is coaxially and separably connected to both ends in the axial direction Body,
Concrete comprising: a plurality of partition plates extending from a boundary portion of the outer frame body in the cylindrical body to the inside of the cylindrical body and arranged so as to span between the inner surfaces of the pair of circular members. A mold for centrifugal molding of segments. The mold for centrifugal molding of a concrete segment according to claim 1, wherein a stiffener is formed on an outer surface of the outer frame body. The stiffener includes a first flange portion formed at both ends in the length direction of the outer frame body, a second flange portion formed at both ends in the width direction of the outer frame body, and the outer frame body. Including at least one rib erected on the outer surface,
The first flange portion is connected to another adjacent outer frame body directly or via a partition plate, and the second flange portion is in contact with the inner surfaces of the pair of circular members. The mold for centrifugal molding of a concrete segment according to claim 2, wherein the mold is connected to a circular member by a fixing means.   The partition plate is interposed between outer frame bodies that are connected when the cylindrical body is formed, and is integrally connected to the outer frame body by a connector between the outer frame bodies, and a part of the partition plate is a cylindrical body. The formwork for centrifugal molding of a concrete segment according to any one of claims 1 to 3, which extends inward. The formwork for centrifugal molding of a concrete segment according to claim 4, wherein an inner diameter center of each outer frame body in the cylindrical body is set back by a predetermined amount in a radial direction from the center of the cylindrical body. It is formed in a cylindrical shape having one axial end face formed by a plane orthogonal to the axis and the other axial end face formed by a plane obliquely intersecting the axis, and the one end face is the pair of circular members. The mold for centrifugal molding of a concrete segment according to any one of claims 1 to 5, further comprising a spacer coaxially attached to any one of the inner surfaces. A pair of circular members are coaxially and detachably connected to both ends in the axial direction of a cylindrical body formed by connecting a plurality of arc-shaped outer frame bodies in a circumferential direction in a separable state. Assembling a centrifugal mold form in which a plurality of partition plates are arranged so as to extend from the boundary portion of the frame body to the inside of the cylindrical body and span between the inner surfaces of the pair of circular members,
The centrifugal mold is placed coaxially in a centrifugal drum of a centrifugal molding device,
Concrete is placed in the mold for centrifugal molding while rotating the centrifugal drum,
After the placing, the centrifugal mold is removed from the centrifugal drum and the concrete is cured,
A method for producing a concrete segment, comprising disassembling the centrifugal mold.

Images