JP4658090B2 - Method for manufacturing outer shell PCa member and formwork apparatus for manufacturing outer shell PCa member - Google Patents

Description

  The present invention relates to a method of manufacturing an outer shell PCa member having a protruding portion formed at an end thereof by centrifugal force and a formwork apparatus for manufacturing the outer shell PCa member.

  In order to improve the construction efficiency of buildings, pillars and beams using outer shell PCa members (thin PCa members) are being constructed. As the outer shell PCa member used for the column, there is a case where the outer shell PCa member having a cylindrical cross section in which a hoop line or the like is embedded in a thin-walled concrete outer shell. When building a column using the outer shell PCa member, the column main reinforcement is usually inserted inside the outer shell PCa member up to the height below the beam, and the PCa beam member is placed on the top. The beam is constructed, and concrete is cast up to the height above the beam inside the outer shell PCa member to construct the column. At that time, the column formwork between the beams at the top of the column was assembled by a conventional method at the construction site, or a steel formwork was attached. However, if the column form between each beam is provided at the site, the construction efficiency is deteriorated. In particular, when a column facing the outer periphery of a building is constructed with an outer shell PCa member, the construction area of the formwork increases between the beams on the outer peripheral surface side, and an external scaffold for providing the formwork is required. The construction efficiency was bad. In order to save labor for the construction of this formwork, as shown in Patent Document 1, the remaining rectangular outer edge part obtained by cutting out the three sides of the tip part of the hollow PCa column formwork, that is, the protruding part of the outer shell PCa member, Forming at the end of the outer shell PCa member and using it as a column form has been performed.

On the other hand, as shown in Patent Document 2, the outer shell PCa member is manufactured by centrifugal molding using centrifugal force by placing concrete in a concrete formwork in which hoop bars are arranged. In this manufacturing method, the concrete cast in the mold is pressed against the inner surface of the outer mold by centrifugal force, and moves along the inner periphery of the outer mold, so that the space between the outer mold and the inner mold is reduced. The outer shell PCa member is formed to have a substantially uniform thickness. In this manufacturing method, when the protrusion is formed at the end of the outer shell PCa member, a temporary filling (anko material) is arranged on the mold part around the protrusion to prevent the inflow and adhesion of the concrete around the protrusion. Protruding part was formed by blocking.
JP 2005-139866 A JP-A-01-72806

  However, in the centrifugal molding shown in Patent Document 2, when the protrusion is formed at the end of the outer shell PCa member using the temporary filling, the temporary filling is placed between the outer mold and the inner mold at the temporary filling installation portion. However, the concrete wraparound is necessary at the projecting portion of the projecting portion, and the required amount of concrete differs depending on the formwork portion. However, in centrifugal molding, it is difficult to control the amount of concrete for each part of the formwork. For this reason, depending on the state of placing concrete into the mold, there is an excess or deficiency in the amount of concrete on the protruding portion, and there is a problem that the shape and thickness of the protruding portion cannot be secured appropriately.

  The present invention was devised in view of the above-described conventional problems, and a method of manufacturing an outer shell PCa member capable of easily ensuring the shape and appropriate thickness of the protrusion formed at the end, and It aims at providing the formwork apparatus which manufactures outer shell PCa member.

  In the method of manufacturing the outer shell PCa member according to the present invention, the outer shell PCa member having a protruding portion at the end is obtained by partially removing the end of the hollow cylindrical outer shell PCa member formed by centrifugal force. A method of manufacturing, wherein the outer shell PCa member is separated from the end of the cylindrical mold frame by a predetermined length on the inner peripheral surface of the cylindrical mold frame for centrifugally forming the outer shell PCa member. And a plurality of axial partitions on the inner peripheral surface of the cylindrical formwork from both ends of the circumferential partition material toward the end of the tubular formwork. After the partition material installation step for installing the material and the partition material installation step, the concrete is placed in the cylindrical formwork and the outer shell PCa member is centrifugally formed. The outer shell P is removed while removing the circumferential partition material and the axial partition material. a projecting portion for removing the end portion of the cylindrical formwork and the portion surrounded by the circumferential partition member and the axial partition member from the outer shell PCa member in order to form a projecting portion at the end portion of the a member And a forming step.

  A method of manufacturing an outer shell PCa member having a protruding portion at an end portion by partially removing an end portion of a hollow cylindrical outer shell PCa member formed by centrifugal force, wherein the outer shell PCa member is A prismatic inner mold frame is separated from the inner peripheral surface by a predetermined length along the axial direction of the cylindrical mold frame at each corner portion of the inner circumferential surface of the cylindrical mold frame to be centrifuged. And installing a circumferential partition material on the inner peripheral surface of the cylindrical formwork, spaced apart from the end of the tubular formwork by a predetermined length, in the circumferential direction of the tubular formwork, and A partition material installation step of installing a plurality of axial partition materials from both ends of the circumferential partition material toward the end portions of the cylindrical mold frame on the inner peripheral surface of the cylindrical mold; and the partition After the material installation step, the concrete is placed in the cylindrical formwork, the outer shell PCa member is centrifugally formed, and after the concrete is hardened The cylindrical mold and the inner mold are removed, the circumferential partition member and the axial partition member are removed, and the cylindrical mold is formed to form a protrusion at the end of the outer shell PCa member. And a projecting portion forming step of removing a portion surrounded by the end portion of the frame, the circumferential partition member, and the axial partition member from the outer shell PCa member.

  The formwork apparatus for manufacturing the outer shell PCa member according to the present invention has an outer shell having a protruding portion at an end portion by partially removing the end portion of the hollow cylindrical outer shell PCa member formed by centrifugal force. A mold apparatus for manufacturing a PCa member, wherein the cylindrical shape is separated from an end of the cylindrical mold by a predetermined length on an inner peripheral surface of a cylindrical mold that centrifugally molds the outer shell PCa member. A circumferential partition material is provided in the circumferential direction of the mold frame, and a plurality of the partition walls are provided on the inner peripheral surface of the cylindrical mold frame from both ends of the circumferential partition material toward the end of the cylindrical mold frame. The axial partition material is provided. On the inner peripheral surface of the cylindrical formwork, an intermediate axial direction partitioning material is installed from the intermediate part of the circumferential partitioning material toward the end of the cylindrical formwork.

  A mold apparatus for manufacturing an outer shell PCa member having a protruding portion at an end by partially removing an end of a hollow cylindrical outer shell PCa member formed by centrifugal force, the outer shell PCa A prismatic inner mold that is spaced apart from the inner peripheral surface by a predetermined length along the axial direction of the cylindrical mold frame at each corner of the rectangular inner peripheral surface of the cylindrical mold for centrifugally forming the member. A frame is provided, and on the inner peripheral surface of the cylindrical mold frame, a circumferential partition material is provided in the circumferential direction of the cylindrical mold frame with a predetermined length apart from the end of the cylindrical mold frame; A plurality of axial partitioning members are provided on the inner peripheral surface of the cylindrical formwork from both ends of the circumferential partitioning material toward the end of the tubular formwork.

  An intermediate axial partition material is provided on the inner peripheral surface of the cylindrical mold from the intermediate portion of the circumferential partition to the end of the cylindrical mold.

  According to the present invention, the shape and proper thickness of the protruding portion formed at the end can be easily ensured by the method for manufacturing the outer shell PCa member and the formwork device for manufacturing the outer shell PCa member.

  Hereinafter, a preferred embodiment of a method for manufacturing an outer shell PCa member and a formwork apparatus for manufacturing the outer shell PCa member according to the present invention will be described in detail with reference to the accompanying drawings. As shown in FIGS. 1 to 10, the mold apparatus for manufacturing the outer shell PCa member according to the present embodiment basically has an end portion of the hollow cylindrical outer shell PCa member 10 formed by centrifugal force. A mold apparatus for manufacturing an outer shell PCa member 1 having a protruding portion 2 at an end portion by partially removing the inner periphery of a tubular mold frame 4 for centrifugally forming the outer shell PCa member 1 Each corner portion 4c of the surface 4b is provided with a prismatic inner mold frame 8 spaced apart from the inner peripheral surface 4b by a predetermined length along the axial direction of the cylindrical mold frame 4. On the peripheral surface 4b, a circumferential partition member 5 is provided in the circumferential direction of the cylindrical mold frame 4 so as to be spaced apart from the end 4a of the cylindrical mold frame 4 by a predetermined length, and the inner peripheral surface of the cylindrical mold frame 4 A plurality of axial partition members 6 are provided on both ends of the circumferential partition member 5 from the both ends of the circumferential partition member 5 toward the end portion 4a of the tubular mold frame 4. Inner onto the peripheral surface 4b, the circumferential direction partition member intermediate portion axial direction partition member 7 toward the fifth intermediate portions 5b to the end portion 4a of the cylindrical mold 4 is disposed in.

  In the outer shell PCa member 1 according to the present embodiment, the end portion of the hollow cylindrical outer shell PCa member 10 formed by centrifugal force is partially removed, so that the protruding portion 2 is formed at the end portion. Yes. Here, the hollow-cylindrical outer shell PCa member 10 is the outer shell PCa member 1 at the stage before the “end portion is partially removed” in the manufacturing process of the outer shell PCa member 1 having the protruding portion 2 at the end. Means. Accordingly, in the present embodiment, the “hollow cylindrical outer shell PCa member 10” is an outer shell PCa member including the “outer shell PCa member 1”, and is a hollow cylinder at a stage before the protruding portion 2 is formed at the end. It is the “outer shell PCa member 1” in the shape. In addition, the part 20 that is “partially removed” (hereinafter referred to as “removed part 20”) according to the manufacturing method of the present embodiment is a part that is finally removed, and is not completely molded. May be.

  The outer shell PCa member 1 in the present embodiment is a pillar member made of thin-walled PCa concrete having a square-shaped cross section (hereinafter referred to as “round-shaped cross section”). The outer shell PCa member 1 is a column member installed on the outer wall side of a building, and beams 30 are connected to three side surfaces among the four side surfaces forming a square-shaped cross section. That is, two beams 30 from the X direction are linearly arranged on the upper part of the outer shell PCa member 1, and another beam 30 is arranged from the Y direction perpendicular to the X direction beam 30, and the outer shell PCa. This is a column member in which a beam 30 is connected to the member 1 in a T shape. The outer shell PCa member 1 is composed of a cylindrical outer shell portion 3 having a square cross section and a protruding portion 2 formed at an end portion thereof. The protruding portion 2 is formed by extending the side surface of the cylindrical outer shell portion 3 to which the beam 30 is not connected in the length direction of the cylindrical outer shell portion 3.

  Hoop muscles 11 are provided in the cylindrical outer shell portion 3 at a predetermined interval. The hoop bar 11 is composed of a cross-shaped reinforcing bar 11a and a round-shaped reinforcing bar 11b surrounding the reinforcing bar 11a, and is fixed and assembled to a temporary reinforcing bar 11c for bar arrangement. The cross-shaped reinforcing bar 11a is formed in a cross shape by combining rectangular annular reinforcing bars vertically and horizontally. The protruding end of the cross-shaped reinforcing bar 11a, that is, the rectangular short side portion, is embedded in the concrete of the outer shell of the cylindrical outer shell 3. The square rebar 11b has substantially the same shape as the square cross section of the cylindrical outer shell 3 and is embedded in the concrete of the outer shell together with the short side portion of the cross-shaped reinforcing bar 11a. The long sides of the cross-shaped reinforcing bars 11a are exposed inside the cylindrical outer shell 3 so as to intersect the cross in one set in the vertical direction (two reinforcing bars) and one set in the horizontal direction (two reinforcing bars). Even if the column main bars are embedded in the concrete of the outer shell of the cylindrical outer shell portion 3 in addition to the hoop bars 11, or only the crack prevention bars are embedded without burying the column main bars or the hoop bars 11. good.

  The protruding portion 2 is formed at an end portion of the cylindrical outer shell portion 3 and is formed of thin PCa concrete like the cylindrical outer shell portion 3. The protruding portion 2 includes a cylindrical outer shell portion 3 on the side shell to which the beam 30 is not connected, and a part 2b of the outer shell connected to the end portion thereof (hereinafter referred to as a “bent portion 2b”). The cylindrical outer shell 3 is formed in a shape extending in the length direction, that is, in the axial direction of the cylindrical mold 4 (hereinafter simply referred to as “axial direction”). In the present embodiment, the “axial direction” corresponds to the axial direction of each of the length directions of the outer shell PCa member 1, the cylindrical outer shell portion 3, and the cylindrical mold 4. The cross-sectional shape of the protruding portion 2 is a U-shape, and the thickness thereof is formed to be equal to the thickness of the outer shell of the cylindrical outer shell portion 3. The shape of the end surface of the cylindrical outer shell portion 3 where the protruding portion 2 is not formed (hereinafter referred to as “cylindrical end surface 3a”) is also U-shaped. The bent portions 2b at the two upper and lower sides of the U-shaped cross section of the projecting portion 2 form a mold that closes the gap between the beam 30 side surface of the outer shell PCa member 1 and the outer wall side column side surface. The lateral outer shell at the position of the U-shaped vertical side of the U-shaped cross section of the projecting portion 2 serves as the outer wall side pillar side surface and constitutes the outer wall of the building. A wire mesh 12 is embedded in the member of the protruding portion 2 as a reinforcing material. In the present embodiment, a part of the temporary reinforcing bar 11 c of the hoop bar 11 is extended to the protruding part 2 and embedded in the member of the protruding part 2. The wire mesh 12 is arranged along the U-shaped cross section of the protruding portion 2, and the end of the wire mesh 12 on the cylindrical outer shell 3 side is extended and embedded in the outer shell of the cylindrical outer shell 3. ing. The wire mesh 12 has a function as a reinforcing material for securing the U-shaped form of the protruding portion 2 itself and a reinforcing material for ensuring the integrity of the protruding portion 2 and the cylindrical outer shell portion 3. ing. The reinforcing material is not limited to the wire mesh 12 as long as it does not obstruct the formation of the protruding portion 2 due to the concrete, and for example, a reinforcing wire mesh may be used.

  The manufacturing apparatus for centrifugally forming the outer shell PCa member 1 is mainly composed of a cylindrical mold 4, a mold rotating device (not shown), and a concrete placing device. These are conventionally used for centrifugal molding. The mold rotation device is a device that rotates the cylindrical mold 4 on a rotating body. The concrete placement device is a device for placing concrete in the tubular mold 4, and a tremy tube 100 and a tremmy tube that are movably inserted into and removed from the end 4 a of the tubular mold 4. It consists of a concrete pumping device (not shown) connected to 100.

  The cylindrical mold 4 in the present embodiment is a steel hollow mold for centrifugally forming the outer shell PCa member 1 having a rectangular cross section, and is also a mold for centrifugally forming the hollow cylindrical outer shell PCa member 10. . An inner mold 8 is installed on the inner side, and a closing plate 9 is attached to the end 4 a of the cylindrical mold 4. The cylindrical formwork 4 has a length in which the cylindrical outer shell portion 3 and the protruding portion 2 of the outer shell PCa member 1 are integrated, that is, a length longer than the hollow cylindrical outer shell PCa member 10. . The outer shape of the cylindrical formwork 4 is a columnar shape that can be rotated on a rotating device, and a circular rib 40 for rotation is provided around it. The inner peripheral surface 4b of the cylindrical mold 4 in the present embodiment is formed in a square shape by combining a plane 4bp (hereinafter referred to as "inner peripheral plane 4bp") in order to manufacture the outer shell PCa member 1 having a square-shaped cross section. It is formed in a cross section. The cylindrical formwork 4 in this embodiment has a V-shaped section obtained by dividing the B-shaped cross section into two in the diagonal direction as an inner peripheral cross-sectional shape, and the outer peripheral cross-sectional shape is a semicircular V-shaped steel mold. A frame 41 (hereinafter referred to as “V-shaped frame 41”) is configured to be detachable.

  An inner mold 8 is disposed inside the cylindrical mold 4. When the cylindrical outer shell 3 is centrifugally molded, the inner mold 8 forms the inner corner of the cylindrical outer shell 3 to ensure a thin, rounded cross-section, and the projection 2 It has a function of securing a letter-shaped cross-sectional shape. The inner mold 8 is composed of four prismatic members 80 disposed along the axial direction inside each corner 4c of the inner shape of the square shape of the cylindrical mold 4. Each prismatic material 80 is formed of a steel pipe column having a substantially square cross section. Each prismatic member 80 is disposed at a predetermined distance from the inner peripheral surface 4b of the corner portion 4c of the cylindrical mold 4 so that the thickness of the corner portion of the outer shell PCa member 1 can be secured. This separation length is a predetermined thickness dimension of the outer shell of the outer shell PCa member 1. The four prismatic members 80 are arranged on the inner side of the cylindrical formwork 4 with a gap therebetween so as to have a substantially square positional relationship. The interval between the prisms 80 adjacent to each other in the left-right or up-down direction is that the concrete placed inward of the cylindrical formwork 4 moves to the inner peripheral surface 4b of the tubular formwork 4 by centrifugal force. Dimensions that do not hinder are secured. In the present embodiment, cross-shaped reinforcing bars 11 a are installed between the prismatic members 80. Each prismatic material 80 of the inner mold 8 in this embodiment is fixed in position by a plurality of support bars 81. The support rod 81 is arranged along the prismatic material 80, and the end thereof is detachably fixed to the closing plate 9.

  A closing plate 9 is attached to the ends of the cylindrical mold 4 and the inner mold 8. The closing plate 9 has a function as a mold for molding the end portion of the outer shell PCa member 1 and a function of holding the position of the inner mold 8 relative to the cylindrical mold 4. The closing plate 9 is composed of a steel plate panel, and an opening 90 for inserting / removing the tremy tube 100 into / from the cylindrical formwork 4 is provided at the center thereof, and a support rod 81 is penetrated around the opening. A hole to be fixed and a bolt hole for fixing the closing plate 9 to the cylindrical formwork 4 are provided.

  On the inner peripheral surface 4b of the cylindrical formwork 4, a circumferential partition member 5, an axial partition member 6, and an intermediate axial partition member 6 are installed. In this embodiment, the circumferential partition member 5 and the axial partition member 6 are made of steel rod-shaped members having a right-angled triangular cross section, and are attached from the outer peripheral surface side of the tubular mold frame 4 with bolts or the like. The circumferential partition member 5 and the axial partition member 6 have a function of specifying the removed portion 20 in the outer shell PCa member 1 (hollow cylindrical outer shell PCa member 10) that is centrifugally molded by the cylindrical mold 4. ing. Therefore, the circumferential partition member 5 and the axial partition member 6 are important members for forming the protruding portion 2 at the end of the outer shell PCa member 1. The removed portion 20 in the present embodiment is a portion specified as a portion surrounded by the end 4 a of the cylindrical mold 4, the circumferential partition member 5, and the axial partition member 6. The removal portion 20 is formed in the same U-shape as the U-shape of the cylindrical body end surface 3 a of the cylindrical outer shell portion 3, and becomes a pair of the protruding portion 2 to form a rectangular shape of the cylindrical outer shell portion 3 The same cross-sectional shape as the cross section is formed at the end of the outer shell PCa member 1 (hollow cylindrical outer shell PCa member 10).

  The circumferential partition member 5 is provided on the inner circumferential surface 4b of the cylindrical formwork 4 at a predetermined distance from the end 4a and in the circumferential direction. The predetermined length in the present embodiment is set to the length of the protruding portion 2, that is, the length from the tip end portion of the protruding portion 2 to the cylindrical end surface 3 a of the cylindrical outer shell portion 3. The circumferential partition member 5 has a function of forming the cylindrical end surface 3 a while separating the cylindrical outer shell portion 3 and the removal portion 20 and forming an end shape of the removal portion 20. The circumferential partition member 5 is provided in the circumferential direction in accordance with the shape (U-shape) of the cylinder end surface 3a. An axial partition member 6 is provided at the end 5 a of the circumferential partition member 5. The circumferential partition member 5 in the present embodiment includes a first circumferential bar member 50 attached to the positions of the upper and lower sides of the U-shape, and a second circumferential bar member 51 attached to the position of the U-shaped longitudinal sides. Consists of In the present embodiment, the circumferential bar members 50 and 51 are continuous with each other via the intermediate axial partitioning material 7 at the corners of the U-shaped circumferential partitioning material 5, that is, the corners 4c of the inner peripheral surface 4b. It is attached to do. The end faces of the circumferential bar members 50 and 51 in contact with the intermediate axial partition material 7 are formed by a plane perpendicular to the material axis. An axial partition 6 is provided at the end 5 a of the circumferential partition 5, that is, at the end 50 a of the first circumferential bar 50. The end 50a of the first circumferential bar 50 is processed obliquely in accordance with the shape of the triangular cross section of the axial partition 6 so that the cylindrical end surface 3a can be formed in combination with the axial partition 6. It has a wedge-shaped wedge shape. Each of the circumferential bar members 50 and 51 is aligned with the 90 ° corner of the member cross section at the position where the cylindrical end surface 3a on the inner peripheral plane 4bp is formed, and the 45 ° corner is the inner side of the cylindrical mold 4 It is provided so as to protrude. In this embodiment, the projecting dimensions of the circumferential bar members 50 and 51, that is, the circumferential partition members 5 to the inside of the cylindrical formwork 4 are set to be equal to the projecting dimensions of an axial partition member 6 to be described later. Yes.

  Two axial partition members 6 of the present embodiment are provided along the axial direction from both end portions 5 a of the circumferential partition member 5 to the end portion 4 a of the tubular mold 4. The axial partitioning member 6 separates the protruding portion 2 and the removal portion 20, and the axial end surface of the protruding portion 2, that is, the axial end surface 2a of the bent portion 2b (hereinafter simply referred to as “axial end surface 2a”). It has the function to form. The axial partition member 6 is aligned with the 90 ° corner of the member cross section at the position where the axial end surface 2a is formed on the inner peripheral surface 4b, and the 45 ° corner projects inward of the cylindrical formwork 4. It is provided to do. The projecting dimension of the axial partition material 6 inward of the cylindrical formwork 4 is equal to or less than a predetermined thickness dimension determined in advance with respect to the outer shell of the outer shell PCa member 1 at the installation position. The axial partition material 6 is set at a position sandwiched between the inner peripheral surface 4 b of the cylindrical mold 4 and the inner mold 8. Both end surfaces of each axial partition material 6 are processed into a plane perpendicular to the axial direction of the material. The end surface of the axial partition member 6 on the circumferential partition member 5 side extends to a position where the end surface of the cylindrical outer shell portion 3 is formed, and is combined with the wedge-shaped end portion 50 a of the first circumferential rod member 50. A cylindrical end surface 3a is formed. The other end surface extends to the end 4 a of the cylindrical mold 4. In this embodiment, “from both ends of the circumferential partition member 5” means that the axial partition member 6 at both end portions 5 a of the circumferential partition member 5 cooperates with the circumferential partition member 5, and the shaft of the protruding portion 2. This means that the axial end face 2a and the cylindrical end face 3a of the cylindrical outer shell 3 are combined so as to be formed, and the axial partition member 6 is connected to the side surface or end face of the end portion 5a of the circumferential partition member 5. It is not limited to the meaning that the axial partition material 6 and the circumferential partition material 5 are physically connected or in close contact with each other, and a slight gap or deviation between them is allowed.

  Since the circumferential partition member 5 and the axial partition member 6 are both rod-shaped members provided so that the 45 ° corners, that is, the chevron portions, are located inside the tubular mold frame 4, the cylindrical mold frame 4 When the concrete cast inwardly moves to the inner peripheral surface 4b of the cylindrical formwork 4 through the space between the inner formwork 8 from the inside of the cylindrical formwork 4 by centrifugal force, the circumferential direction When it hits the partition material 5 or the axial partition material 6, it is smoothly distributed to both sides without the concrete adhering to the surfaces of the partition materials 5 and 6 by those chevron portions protruding inward of the cylindrical formwork 4. The placed concrete can be appropriately distributed to each range of the cylindrical formwork 4 where the cylindrical outer shell portion 3, the protruding portion 2, and the removal portion 20 are formed. For this reason, the thickness of the member of the projecting portion 2 formed is equal to or greater than the predetermined thickness, that is, the separation distance between the inner mold frame 8 and the inner peripheral surface 4b of the cylindrical mold frame 4, and the outer shell PCa member 1 It becomes easy to form the inner column main reinforcement to a thickness (thin wall) that can be arranged at a predetermined position. In addition, the member thickness of the protrusion part 2 in the case of not having the inner mold frame 8 is the maximum inner diameter of the hollow part of the centrifugally formed cylindrical outer shell part 3 and the inner peripheral surface 4b of the cylindrical mold frame 4 The size of the difference. Since the protrusion 2 and the removal portion 20 are only partitioned by the circumferential partition member 5 and the axial partition member 6 which are triangular cross-section rod-like members, the removal portion 20 and the protrusion 2 of the cylindrical formwork 4 are separated from each other. The inner peripheral surface 4b to be formed and the inner peripheral surface 4b to form the cylindrical outer shell 3 are almost the same in shape. For this reason, the cast concrete placed without waste in the removal part 20 and the protrusion part 2 can be made to flow in by centrifugal force, and it protrudes in the same manner as the thickness control of the outer shell concrete part of the cylindrical outer shell part 3. The thickness of the part 2 can be formed.

  On the inner peripheral surface 4 b of the cylindrical mold 4, an intermediate axial partition 7 is provided from the intermediate part 5 b of the circumferential partition 5 toward the end 4 a of the cylindrical mold 4. The intermediate axial partition member 7 divides the removal portion 20 to facilitate the removal of the removal portion 20 from the outer shell PCa member 1 (hollow cylindrical outer shell PCa member 10). It has a function to prevent the outer shell PCa member 1 from being damaged by preventing an excessive force from acting on the outer shell PCa member 1 during the removal operation. The intermediate portion axial partition member 7 of the present embodiment is provided in the axial direction from the portion located at the corner portion 4 c of the inner peripheral surface 4 b of the circumferential partition member 5 toward the end portion 4 a of the cylindrical mold 4. ing. The intermediate part axial partition member 7 is installed at both corners of the U-shaped cross section of the removal portion 20 and is a combination of steel rod members 70 having a right isosceles triangle section (hereinafter referred to as “triangular section rod member 70”). It is configured as a steel rod with a square cross section. The triangular cross-section rod-shaped material 70 is a triangular cross-section rod-shaped material capable of forming the same projecting dimensions as the axial partition material 6 and is attached to each inner circumferential plane 4 bp. By forming the inner peripheral surface 4 bp in a square shape and forming the inner peripheral surface 4 b, the triangular cross-section rod-shaped material 70 is combined at the corner 4 c of the cylindrical mold 4, and the intermediate section axial partition having a square cross section is formed. Material 7 is formed. Thus, by dividing the intermediate part axial partition material 7 into the triangular cross-section rod-like material 70, the intermediate part axial partition material 7 is used as a rod-like material having the same triangular cross section as the other partition members 5 and 6. Since the number of members of the partition members 5, 6, and 7 attached to the inner peripheral planes 4bp can be averaged, the handling of the partition members 5, 6, and 7 in units of the peripheral planes 4bp becomes easy. Further, in the case where the cylindrical mold 4 is constituted by a V-shaped frame 41 divided into two, the V-shaped frame 41 can be easily formed even if the intermediate axial partition material 7 is positioned at the connecting portion of the V-shaped frame 41. Can be assembled. Since the contact surfaces of the combined triangular cross-section rod-shaped material 70 are not connected to each other, it is easy to divide the removed portion 21 at the U-shaped corner.

  In the present embodiment, both end surfaces of the intermediate part axial partition material 7 are processed into a plane perpendicular to the material axial direction. One end surface of the intermediate part axial partition member 7 extends to the position of the cylindrical end surface 3 a and forms the cylindrical end surface 3 a together with the circumferential partition member 5. In the present embodiment, the circumferential bar members 50 and 51 are attached to each other at the corners 4c of the inner peripheral surface 4b so as to be continuous with each other via the intermediate axial partition material 7, thereby obtaining the "circumferential partition material". An intermediate axial partition 7 is provided from the intermediate part 5b. “From the intermediate part 5b of the circumferential partition member 5” means that the intermediate part axial partition member can divide the removal part 20 from the position of the cylindrical end surface 3a without disturbing the formation of the end surface of the cylindrical outer shell part 3. 7, and as in the present embodiment, the intermediate axial partition material 7 from the end face located at the intermediate portion 5 b of the circumferential partition member 5 and the side surface of the intermediate portion 5 b of the circumferential partition member 5. It is not limited to forming.

  The intermediate part axial partition member 7 is attached to each of two flat surfaces of the inner peripheral surface 4b constituting the corner part 4c, with the 45 ° corner part of the right isosceles triangular section aligned with the corner part 4c. Each intermediate part axial partition member 7 in a state of being combined in a square cross section, and the corners thereof are attached so as to protrude inwardly into the mold. The corner portion of the intermediate axial partition member 7 protrudes to a position close to the corner portion of the prismatic member 80 of the inner mold 8. In the present embodiment, the intermediate axial partition material 7 is disposed at the corner 4c of the inner peripheral surface 4b. For this reason, each inner peripheral surface 4b has nothing to prevent the movement of the concrete in the direction of the inner peripheral surface other than the corner portion 4c, and the inner mold surface 8 and the inner peripheral surface 4b of the cylindrical mold frame 4 are securely connected. Concrete can be made to flow in between, and the concrete cast in the cylindrical formwork 4 can be effectively used as the concrete for forming the removal portion 20.

  In addition, in this embodiment, since the intermediate part axial partition material 7 is arrange | positioned only in the corner part 4c of the internal peripheral surface 4b, it is two, However, You may provide in the center part of each plane. For example, it is possible to add the intermediate axial partition material 7 to the inner peripheral plane 4 bp between the inner mold frames 8 and divide the inner peripheral plane 4 bp into two. In that case, the intermediate part axial partition material 7 is attached as a triangular cross-section rod-like material like the axial partition material 6 so that the corner of the cross-section protrudes inwardly into the cylindrical formwork 4. Thus, the concrete placed on the tubular mold 4 can be distributed to both sides of the chevron in a balanced manner while preventing the concrete from adhering to the intermediate axial partition material 7. For this reason, the concrete cast in the cylindrical formwork 4 is formed as the concrete forming the removal portion 20. Further, it is also possible to provide the intermediate portion axial partition material 7 in the central portion of the inner peripheral plane 4bp at the position of the U-shaped vertical side of the U-shaped removed portion 20 without providing the corner portion 4c. In this case, the U-shaped removal portion 20 can be divided into two L-shaped corners and removed from the outer shell PCa member 1. Further, the removal portion 20 may be removed from the outer shell PCa member 1 without providing the intermediate portion axial partition member 7 while maintaining the U-shape. In addition, the intermediate part axial partition material 7 should just be divided to such an extent that the removal operation | work of the removal part 20 becomes easy, and the concrete of the both sides on both sides of the intermediate part axial direction partition material 7 is shape | molded as a continuous body. Also good.

  The circumferential partition member 5 in the present embodiment is a rod-like member and is attached in units of a plane of the inner peripheral surface 4b, but may be a continuous integral U-shaped member. Moreover, although the intermediate | middle part axial direction partition material 7, the axial direction partition material 6, and the circumferential direction partition material 5 in this embodiment were each made into a single member, each partition material 5 and 6 to attach in the same inner peripheral plane 4bp unit. , 7 may be connected in advance to form one unit. At the time of connection, a bar-shaped connecting member may be added and connected, and handling is facilitated by forming a single unit. For example, by fixing only the connecting member with a bolt or the like from the outer peripheral side of the cylindrical mold 4, the entire unit is also fixed, so that the attachment / detachment work is facilitated. Moreover, since each partition material 5,6,7 is a steel member, it can be used repeatedly many times. In addition, the cross section of each partition material 5,6,7 is not limited to a triangle, An L-shaped cross section, a square cross section, etc. may be sufficient.

  A method for manufacturing the outer shell PCa member 1 according to the present embodiment will be described. The manufacturing method of the outer shell PCa member 1 according to the present embodiment is such that the end portion of the hollow cylindrical outer shell PCa member 10 formed by centrifugal force is partially removed to have the protruding portion 2 at the end portion. A method of manufacturing the shell PCa member 1, wherein the axial direction of the cylindrical mold 4 is provided at each corner 4 c of the rectangular inner peripheral surface 4 b of the cylindrical mold 4 that centrifugally molds the outer shell PCa member 1. The prismatic inner mold frame 8 is installed at a predetermined length away from the inner peripheral surface 4b along the inner circumference surface 4b, and the predetermined length from the end 4a of the cylindrical mold frame 4 is set on the inner peripheral surface 4b of the cylindrical mold frame 4. The circumferential partition material 5 is installed in the circumferential direction of the cylindrical mold 4 so as to be separated from the length, and the cylindrical mold is formed on the inner peripheral surface 4 b of the cylindrical mold 4 from both ends 5 a of the circumferential partition material 5. After the partition material installation step of installing a plurality of axial partition materials 6 toward the end 4a of the frame 4 and the partition material installation step, the cylindrical mold Concrete is cast in 4 and the outer shell PCa member 1 is centrifugally molded. After the concrete is hardened, the cylindrical mold 4 and the inner mold 8 are removed, and the circumferential partition member 5 and the axial partition member 6 are removed. At the same time, in order to form a protruding portion at the end of the outer shell PCa member 1, a portion surrounded by the end 4 a of the cylindrical mold 4, the circumferential partition member 5 and the axial partition member 6 is defined as the outer shell PCa member 1. And a protrusion forming step to be removed from the substrate.

  As a preparation stage, the hoop muscle 11, the wire mesh 12, the inner mold frame 8, and the closing plate 9 are integrated and assembled in advance. First, the hoop muscle 11 of the outer shell PCa member 1 is assembled. A tube of the outer shell PCa member 1 is supported by the temporary jig and the temporary reinforcing bar 11c while supporting the hoop bar 11 in which the round-shaped reinforcing bar 11b is positioned on the outer periphery of the cross-shaped reinforcing bar 11a obtained by crossing rectangular annular bars vertically and horizontally. It attaches to the length range of the outer shell part 3 at predetermined intervals and assembles into a cylindrical shape. Further, a reinforcing wire mesh 12 processed in a U-shape at the position of the projecting portion 2 is disposed so that one end thereof overlaps the hoop line 11 and is extended to the position of the projecting portion 2. It attaches while supporting to the reinforcing bar 11c. Next, a rectangular column material 80 made of a steel tube column constituting the inner frame 8 is formed in a cylindrical shape on the rectangular part of the four corners formed by the cross-shaped reinforcing bar and the B-shaped reinforcing bar inside the assembled hoop bar 11. The inner mold is configured by inserting from the end side of the hoop muscle 11 and supporting it with the support rod 81. The closing plate 9 is attached to both ends of the inner mold 8, the end of the support material 31 is passed through the closing plate 9, the nut is fixed, and the closing plate 9 and the inner mold 8 are integrated. Thereby, a composite member in which the hoop muscle 11, the wire mesh 12, the inner mold frame 8, and the closing plate 9 are integrated is assembled.

  Next, as a partitioning material installation step, the two V-shaped molds constituting the cylindrical mold 4 are installed with the inner peripheral surfaces 4b facing upward, and the peripheral partitioning material 5 and the axial direction are placed on each inner peripheral plane 4bp. The partition material 6 and the intermediate part axial direction partition material 7 are attached. Any member may be preceded for attachment of each partition material 5,6,7. Each of the partition members 5, 6, and 7 is detachable by screwing an end portion of a bolt penetrating from the outer peripheral side of the V-shaped frame 41 into a bolt hole 21 provided on a surface in contact with the inner peripheral surface 4b. Attach to.

  The circumferential partition material 5 is provided on the inner peripheral surface 4 b of the tubular mold frame 4 along the circumferential direction of the tubular mold frame 4 so as to be separated from the end 4 a of the tubular mold frame 4 by a predetermined length. The circumferential partition member 5 is arranged on the inner peripheral surface 4b so that the end 5a of the circumferential partition member 5 is aligned with the position of the axial end surface 2a of the protruding portion 2 and is aligned with the position of the cylindrical end surface 3a in the circumferential direction. Install in a U-shape. Specifically, the first and second circumferential bar members 50 and 51 constituting the circumferential partition member 5 are attached to the position where the cylindrical end surface 3a is formed. The first and second circumferential bar members 50 and 51 are aligned with the 90 ° corner of the member cross section at the position where the cylindrical end surface 3a of the cylindrical outer shell 3 is formed, and the 45 ° corner is cylindrical. It is attached in a form that protrudes inward of the frame 4. The first circumferential bar-like material 50 is attached to the positions of the upper and lower sides of the U-shaped circumferential partition member 5. The wedge-shaped end portion 50 a of the first circumferential bar member 50 is the end portion 5 a of the circumferential partition member 5, and is disposed so as to be continuous with the axial partition member 6. The other end of the first circumferential bar 50 is arranged so as to be continuous with the second circumferential bar via the intermediate axial partition 7 (triangular cross-section bar 70). The first circumferential bar 50 is attached to the inner circumferential plane 4 bp while securing an installation space for the triangular cross-section bar 70. On the other hand, a second circumferential bar 51 is attached to the position of the U-shaped vertical side of the U-shaped circumferential partition member 5. The second circumferential bar 51 is attached at both ends thereof so as to be continuous with the first circumferential bar 50 via the intermediate axial partition 7 (triangular cross-section bar 70). The second circumferential bar 51 is attached to the inner circumferential plane 4 bp while securing a space for attaching the intermediate axial partition 7 (triangular cross-section bar 70).

  Two axial partition members 6 are provided on the inner peripheral plane 4 bp along the axial direction of the tubular mold frame 4 from both end portions 5 a of the circumferential partition member 5 to the end portion 4 a of the tubular mold frame 4. The axial partition member 6 is arranged in such a manner that one end surface thereof is aligned with the position of the cylindrical body end surface 3 a and the side surface is combined with the wedge-shaped end portion 4 a of the circumferential partition member 5. The other end face is positioned on the end face 4 a of the cylindrical mold 4.

  The intermediate axial partition member 7 is attached between the intermediate portion 5 b of the circumferential partition member 5, that is, between the first circumferential rod member 50 and the second circumferential rod member 51. The attachment position of the intermediate portion axial partition member 7 in the present embodiment is a portion corresponding to the corner portion 4c of the inner peripheral plane 4bp. The triangular cross-section rod-shaped material 70 constituting the intermediate portion axial partition material 7 is divided into 45 ° corners of the cross section of the intermediate portion axial partition member 7 for each inner peripheral plane 4 bp, that is, each corner position of the corner portion 4c. Attaching the other 45 ° corner to the inside of the cylindrical formwork 4 along the edge of the circumferential plane 4 bp. One end face of the intermediate part axial partition member 7 is aligned with the position of the cylindrical end face 3 a, and the other end face is positioned at the end 4 a of the cylindrical mold 4. In the inner peripheral plane 4 bp to which the second circumferential bar 51 is attached, a triangular cross-section bar 70 is disposed across the second circumferential bar 51, and the first circumferential bar 50 is attached. In the circumferential plane 4 bp, the first circumferential bar 50 is disposed between the triangular cross-section bar 70 and the axial partition 6.

  Next, a composite member in which the hoop muscle 11, the wire mesh 12, the inner mold frame 8, and the closing plate 9 are integrated is installed above one V-shaped frame 41. At that time, the inner mold 8 and the inner peripheral surface 4 b of the cylindrical mold 4 are installed with separation of the thickness of the outer shell of the outer shell PCa member 1. Another V-shaped frame 41 is installed so as to cover the installed composite member, and the upper and lower V-shaped frames 41 are detachably fixed with connecting bolts to assemble the cylindrical mold 4. The end closing plate 9 is fixed to the end 4a of the assembled cylindrical form 4 with a bolt. As a result, the inner mold frame is separated from the inner peripheral surface 4b by a predetermined length along the axial direction of the cylindrical mold frame 4 at each corner 4c of the rectangular inner peripheral surface 4b of the cylindrical mold frame 4. The inner mold 8 of the prismatic material 80 is installed. In the partition material installation step in the present embodiment, the inner mold frame 8 is installed after the partition materials 5, 6, 7 are installed on the inner peripheral plane 4 bp of the cylindrical mold frame 4. In parallel with or after installation, each partition member 5, 6, 7 is inserted from the end 4a of the cylindrical formwork 4 while adjusting the positional relationship with the inner formwork 8 or the like. You may attach to 4 bp.

  The assembled tubular mold 4 is placed on the mold rotating device, the treme tube 100 is inserted into the mold from the central opening of the closing plate 9, and concrete is cast from the back of the tubular mold 4. While rotating the cylindrical form 4, the tremy tube 100 is gradually pulled out. Concrete placement is performed in a series of portions where the cylindrical outer shell portion 3 is formed and portions where the protruding portion 2 and the removal portion 20 are formed. The concrete placed in the cylindrical mold 4 is moved from between the prisms 80 of the inner mold 8 to the inner peripheral surface 4b of the cylindrical mold 4 by centrifugal force, and the cylindrical mold 4 is rotated. Accordingly, it moves along the inner peripheral surface 4b and is filled between the inner mold frame 8 and the inner peripheral surface 4b to form an outer shell portion. In the cylindrical formwork 4 in the present embodiment, concrete is cast in the portion where the cylindrical outer shell portion 3 is formed and the portion where the protruding portion 2 and the removal portion 20 are formed, except for the difference in the embedded matter. Since there is no difference in the shape of the parts to be made, the concrete placed in both parts moves in the same way. Moreover, since each partition material 5,6,7 installed is a rod-shaped material, there is little obstacle to the movement of the concrete in the cylindrical formwork 4, and the amount of placing concrete to the protrusion part 2 can be ensured appropriately. The bent portion 2b can also be formed reliably.

  Next, as the projecting portion forming step, fixing bolts for the cylindrical mold 4 and the closing plate 9 after the concrete is hardened, mounting bolts for the cylindrical mold 4 and the partition members 5, 6, 7, and each V-shaped frame The connecting bolt 41 is removed, and the outer shell PCa member 1 (hollow cylindrical outer shell PCa member 10) is removed from the cylindrical mold 4. Next, the closing plate 9 is removed, and the support rod 81 and the prismatic material 80 are pulled out from the end of the outer shell PCa member 1 (hollow cylindrical outer shell PCa member 10), and the inner mold 8 is removed. The outer shell PCa member at this stage is formed as a hollow cylindrical outer shell PCa member 10 in which the cylindrical outer shell portion 3, the projecting portion 2, the partition members 5, 6, 7 and the removal portion 20 are integrated. Yes. The removed portion 20 is removed along the circumferential partition member 5 and the axial partition member 6 from the hollow cylindrical outer shell PCa member 10. The removal portion 20 is removed for each of the U-shaped surfaces along the intermediate axial partition material 7. At this time, the partition members 5, 6, 7 adhering to the respective removal surfaces are removed from the outer shell PCa member 1 together with the respective removal surfaces. Thereafter, the concrete on each removal surface is crushed to separate the partition members 5, 6, and 7, and the partition members 5, 6, and 7 are reused. Thus, since the U-shaped removal portion 20 can be removed for each inner peripheral plane 4 bp, the removal operation is easy, and the removal portion of the member formed without providing the partition members 5, 6, 7. As compared with the case of cutting with a concrete cutter or the like, the possibility of applying an extra force to the protruding portion 2 can be reduced.

  In the mold apparatus for manufacturing the outer shell PCa member according to the present embodiment described above, each corner portion of the rectangular inner peripheral surface 4b of the cylindrical mold frame 4 for centrifugally forming the outer shell PCa member 1 is used. 4c is provided with a prismatic inner mold frame 8 that is spaced apart from the inner circumferential surface 4b by a predetermined length along the axial direction of the cylindrical mold frame 4, and on the inner circumferential surface 4b of the cylindrical mold frame 4, A circumferential partition material 5 is provided in the circumferential direction of the tubular mold frame 4 so as to be spaced apart from the end of the tubular mold frame 4 by a predetermined length, and the circumferential partition is formed on the inner peripheral surface 4 b of the tubular mold frame 4. Since a plurality of axial partition members 6 are provided from both end portions 5a of the material 5 to the end portion 4a of the cylindrical mold frame 4, the projecting portions 2 of the cylindrical mold frame 4 are placed on the portion to be molded. The formed concrete is also moved to the inner peripheral surface 4b in the same manner as the outer shell concrete portion of the cylindrical outer shell portion 3 is formed. Since the portion is formed, the thickness of the projecting portion 2 is obtained by placing the portion of the cylindrical outer shell portion 3 and the forming portion of the projecting portion 2 and the removal portion 20 in series in the cylindrical formwork 4. The sheath shape can be easily secured.

  Formed on the inner peripheral surface 4b of the cylindrical mold 4 because the intermediate axial partition 7 is provided from the intermediate part of the circumferential partition 5 toward the end 4a of the cylindrical mold 4. From the end portion of the outer shell PCa member 1 (hollow cylindrical outer shell PCa member 10), the removed portion 20 surrounded by the end portion 4a of the cylindrical formwork 4, the circumferential partition member 5 and the axial partition member 6 Can be divided and removed for each portion divided by the intermediate axial partition material 7, so that the removal operation is facilitated, the removal force is less likely to act on the protruding portion 2, and the loss of the protruding portion 2 is reduced. be able to.

  In the manufacturing method of the outer shell PCa member according to the present embodiment described above, each corner portion 4c of the cross-sectional square inner peripheral surface 4b of the cylindrical mold 4 for centrifugally forming the outer shell PCa member 1, A prismatic inner mold frame 8 is installed at a predetermined length apart from the inner peripheral surface 4b along the axial direction of the cylindrical mold frame 4, and the cylindrical mold is formed on the inner peripheral surface 4b of the cylindrical mold frame 4. A circumferential partition member 5 is installed in the circumferential direction of the tubular mold frame 4 so as to be separated from the end 4 a of the frame 4 by a predetermined length, and the circumferential partition member 5 is disposed on the inner peripheral surface 4 b of the tubular mold frame 4. After the partition material installation step of installing a plurality of axial partition members 6 from both end portions 5a toward the end portion 4a of the cylindrical mold frame 4, the concrete is put into the cylindrical mold frame 4 after the partition material installation step. After casting, the outer shell PCa member 1 is centrifugally molded, and after the concrete is hardened, the cylindrical mold 4 and the inner mold 8 are removed, and the circumferential partition is formed. 5 and the axial partition material 6 are removed, and the end portion 4a of the cylindrical formwork 4, the circumferential partition material 5 and the axial partition material 6 are formed to form the protruding portion 2 at the end portion of the outer shell PCa member 1. A projecting portion forming step of removing the enclosed portion from the outer shell PCa member 1, and by placing concrete in series in the cylindrical mold 4, the thickness and shape of the projecting portion 2 are reduced. Easy to secure.

  Since the outer shell PCa member 1 in the present embodiment is a pillar member on the outer wall side of the building to which the beam 30 is connected in a T shape from three directions, a protruding portion 2 having a U-shaped cross section is formed at the end thereof. However, it can also be formed as a prism on the outer wall side of the building where the beam 30 is connected to the L shape from two directions. In this case, the protruding portion 2 is formed by extending two L-shaped side surfaces of the outer shell PCa member 1 having a square-shaped cross section and a bent portion 2b at the end in the axial direction, and the cylindrical formwork 4 according to the shape. The circumferential partition member 5 and the axial partition member 6 are provided on the inner peripheral surface 4b having a rectangular cross section. Moreover, you may form the protrusion part 2 by extending the three side surfaces or two opposing side surfaces of the outer shell PCa member 1 of a square-shaped cross section. Further, the bent portion 2b at the end of the protruding portion 2 may be omitted. Also in this modified example, the same effect as the above-described embodiment can be obtained.

  The outer shell PCa member 1 may be formed as a circular cross section. The mold apparatus for manufacturing the outer shell PCa member 1 having a circular cross section has an outer portion having a protruding portion at an end portion by partially removing the end portion of the hollow cylindrical outer shell PCa member 10 formed by centrifugal force. A mold apparatus for manufacturing a shell PCa member 1, which is spaced a predetermined length from an end 4a of a cylindrical mold 4 on an inner peripheral surface 4b of a cylindrical mold 4 for centrifugally forming the outer shell PCa member 1. Thus, the circumferential partition material 5 is provided in the circumferential direction of the cylindrical mold frame 4, and the cylindrical mold frame 4 is formed on the inner peripheral surface 4 b of the cylindrical mold frame 4 from both end portions 5 a of the circumferential partition material 5. A plurality of axial partition members 6 are provided toward the end portion 4a. On the inner peripheral surface 4b of the tubular mold frame 4, the end portion 4a of the tubular mold frame 4 from the intermediate portion 5b of the circumferential partition member 5 is provided. The intermediate part axial direction partition material 7 is installed toward.

  In the mold apparatus in the modified example, since the outer shell PCa member 1 has a circular cross section and no corners, the inner mold 8 for forming the corners to be thin may not be provided. Therefore, the formwork apparatus is simplified. Others are the same as the above-mentioned embodiment, and the same effect can be acquired.

  In addition, the manufacturing method of the outer shell PCa member 1 having a circular cross section includes an outer portion having a protruding portion 2 at the end portion by partially removing the end portion of the hollow cylindrical outer shell PCa member 10 formed by centrifugal force. A method of manufacturing the shell PCa member 1, wherein the shell PCa member 1 is separated from the end 4 a of the cylindrical mold 4 by a predetermined length on the inner peripheral surface 4 b of the cylindrical mold 4 for centrifugally forming the outer shell PCa member 1. The circumferential partition material 5 is installed in the circumferential direction of the cylindrical mold 4, and the end of the cylindrical mold 4 is formed on the inner peripheral surface 4 b of the cylindrical mold 4 from both ends 5 a of the circumferential partition 5. After the partition material installation step of installing a plurality of axial partition materials 6 toward the portion 4a and the partition material installation step, concrete is placed in the cylindrical mold 4 and the outer shell PCa member 1 is centrifuged. After forming and concrete hardening, the cylindrical formwork 4 is removed, and the circumferential partition material 5 and the axial partition material 6 are removed. In order to form the protruding portion 2 at the end portion of the outer shell PCa member 1, the portion surrounded by the end portion 4a of the cylindrical mold 4, the circumferential partition member 5 and the axial partition member 6 is formed as the outer shell. And a protrusion forming step for removing from the PCa member 1.

  In the manufacturing method in the modified example, since the outer shell PCa member 1 has a circular cross section and no corners, the inner mold frame 8 for forming the corners to be thin may not be provided. Therefore, the work of installing the inner mold can be omitted, and the manufacturing method can be simplified. Other than this, it is the same as the above-described embodiment, and the same effect can be obtained.

It is a figure explaining the relationship between the outer shape of the outer shell PCa member and the beam in a preferred embodiment of the method for manufacturing the outer shell PCa member and the formwork apparatus for manufacturing the outer shell PCa member according to the present invention. It is a transverse cross-sectional view of the mold apparatus in one suitable embodiment of the mold apparatus which manufactures the outer shell PCa member concerning this invention. It is a side view of the formwork apparatus shown in FIG. It is a figure which shows the A-A 'cross section of the formwork apparatus shown in FIG. It is a figure which shows the B-B 'cross section of the formwork apparatus shown in FIG. 2A and 2B show the situation of the outer shell PCa member before the end portion manufactured by the formwork apparatus shown in FIG. 2 is partially removed, (a) is a right side view, (b) is a front view, and (c) is a left side. FIG. FIG. 7 shows a circumferential partition member provided on the outer shell PCa member shown in FIG. 6, and (a) is a diagram showing a plan view, a front view, and a side view of the first circumferential bar-like member, (b) These are figures which show the planar view, front view, and side view of a 2nd circumferential direction rod-shaped material. It is a figure which shows the planar view, front view, and side view of the axial partition material provided in the outer shell PCa member shown in FIG. It is a figure which shows the planar view, front view, and side view of the intermediate | middle part axial direction partition material provided in the outer shell PCa member shown in FIG. FIG. 2 is an elevational view showing a reinforcing bar and a reinforcing material embedded in an outer shell PCa member shown in FIG. 1. It is a figure explaining another form of the outer shell PCa member in the manufacturing method of the outer shell PCa member concerning this invention, and the formwork apparatus which manufactures an outer shell PCa member, (a) is two adjacent side surfaces of the outer shell PCa member. It is a sectional view showing a state of an end portion of an outer shell PCa member that extends in the axial direction to form a protruding portion, and an inner peripheral surface of a formwork apparatus for manufacturing the outer shell PCa member and a concrete placement state. b) The figure which shows the condition of the edge part of the outer shell PCa member which extended the three side surfaces of the outer shell PCa member to the axial direction, and formed the protrusion part, and the inner peripheral surface of the formwork apparatus which manufactures it, and concrete placement It is sectional drawing which shows a condition, (c) is the figure which shows the condition of the edge part of the outer shell PCa member which extended the two opposing side surfaces of the outer shell PCa member to the axial direction, and formed the protrusion part, and manufactures it It is a figure which shows the cross section of a formwork apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer shell PCa member 2 Protrusion part 4 Cylindrical formwork 4a Inner peripheral surface of cylindrical formwork 4b End part of cylindrical formwork 5 Circumferential partition material 5a End part of circumferential partition material 5b Middle of circumferential partition material Part 6 Axial partition material 7 Middle part axial partition material 8 Inner mold

Claims (6)

A method of manufacturing an outer shell PCa member having a protruding portion at an end portion by partially removing an end portion of a hollow cylindrical outer shell PCa member formed by centrifugal force,
On the inner peripheral surface of the cylindrical mold for centrifugally forming the outer shell PCa member, a circumferential partition material is spaced apart from the end of the cylindrical mold by a predetermined length, in the circumferential direction of the cylindrical mold. A partition material installation that installs a plurality of axial partition materials from both ends of the circumferential partition material toward the end portions of the cylindrical mold frame on the inner peripheral surface of the cylindrical mold frame Process,
After the partition material installation step, concrete is placed in the cylindrical mold and the outer shell PCa member is centrifugally molded. After the concrete is cured, the cylindrical mold is demolded, and the circumferential partition material and The axial partition material is removed and surrounded by the end portion of the cylindrical formwork, the circumferential partition material, and the axial partition material to form a protruding portion at the end portion of the outer shell PCa member. And a protruding portion forming step of removing the portion from the outer shell PCa member. A method of manufacturing an outer shell PCa member having a protruding portion at an end portion by partially removing an end portion of a hollow cylindrical outer shell PCa member formed by centrifugal force,
The outer shell PCa member is centrifugally molded at each corner of the rectangular inner peripheral surface of the cylindrical mold frame, spaced apart from the inner peripheral surface by a predetermined length along the axial direction of the cylindrical mold frame. A columnar inner mold is installed, and on the inner peripheral surface of the cylindrical mold, a circumferential partition material is provided in the circumferential direction of the cylindrical mold by being separated from the end of the cylindrical mold by a predetermined length. And a plurality of axial partition materials on the inner peripheral surface of the cylindrical formwork from both ends of the circumferential partition material toward the end of the tubular formwork. Installation process;
After the partition material installation step, concrete is placed in the cylindrical mold to centrifugally mold the outer shell PCa member, and after the concrete is cured, the cylindrical mold and the inner mold are demolded, and In order to remove the circumferential partition material and the axial partition material, and to form a protrusion at the end of the outer shell PCa member, the end portion of the cylindrical formwork, the circumferential partition material, and the axial partition A projecting portion forming step of removing a portion surrounded by the material from the outer shell PCa member. A mold apparatus for manufacturing an outer shell PCa member having a protruding portion at an end by partially removing an end of a hollow cylindrical outer shell PCa member formed by centrifugal force,
A circumferential partition material is provided on the inner circumferential surface of the cylindrical mold for centrifugally molding the outer shell PCa member, spaced apart from the end of the cylindrical mold by a predetermined length, in the circumferential direction of the cylindrical mold. In addition, a plurality of axial partition members are provided on the inner peripheral surface of the cylindrical formwork from both ends of the circumferential partition material toward the end of the tubular formwork. A formwork apparatus for manufacturing the outer shell PCa member.   The intermediate part axial direction partition material was installed on the inner peripheral surface of the said cylindrical formwork from the intermediate part of the said circumferential direction partition material toward the said edge part of this cylindrical formwork. The formwork apparatus which manufactures the outer shell PCa member of description. A mold apparatus for manufacturing an outer shell PCa member having a protruding portion at an end by partially removing an end of a hollow cylindrical outer shell PCa member formed by centrifugal force,
The outer shell PCa member is centrifugally molded at each corner of the rectangular inner peripheral surface of the cylindrical mold frame, spaced apart from the inner peripheral surface by a predetermined length along the axial direction of the cylindrical mold frame. A columnar inner mold is provided, and on the inner peripheral surface of the cylindrical mold, a circumferential partition material is spaced apart from the end of the cylindrical mold by a predetermined length in the circumferential direction of the cylindrical mold. Provided that a plurality of axial partition members are provided on the inner peripheral surface of the cylindrical formwork from both ends of the circumferential partition material toward the end of the tubular formwork. A formwork apparatus for producing a characteristic outer shell PCa member.   The intermediate axial partition material is provided on the inner peripheral surface of the cylindrical mold from the intermediate portion of the circumferential partition to the end of the cylindrical mold. A mold apparatus for manufacturing the outer shell PCa member according to claim 5.

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