JP2010163857A - Form separator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a form separator allowing a male screw section from being easily removed from a shaft body without providing an internal space allowing oscillation of a positioning member in the vertical direction. <P>SOLUTION: The form separator comprises a shaft having male screw sections on both ends of the shaft body and positioning members individually installed at both ends of the shaft body in the length direction. A positioning member loading section and a twisting-off groove for twisting the male screw section off the shaft body by turing the operation of the shaft body around the axis of the male screw section is provided on one end of the male screw section in the length direction. The shaft body is provided with a turn-inhibiting means for inhibiting the shaft body embedded in a concrete structure from turning around the axis of the shaft body, and the positioning member comprises a block body formed by compressing mortar. The block body has a through-hole for the shaft body. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a separator for a formwork used to hold the inside of a formwork at a constant interval when assembling a formwork for producing a concrete structure.

  In general, when constructing a concrete structure, in order to harden the mortar, which is a fluid, into a desired shape, a pair of concrete molds composed of steel plates, plywood, etc., and the interior of this concrete mold A mold separator is used to maintain the space at a predetermined size.

  By the way, the conventional separator for formwork basically has a rod-shaped shaft body A and a pair of bowl-shaped shafts provided at both ends in the longitudinal direction of the shaft body A as schematically shown in FIG. And positioning member B.

  And the male screw part C is provided in the both ends of the length direction of the above-mentioned shaft body A, and an annular break groove is formed at a predetermined length inward from the inner end of the male screw part C in the shaft body A. D and a stopper E positioned outside the folding groove D are formed, and the positioning member B described above is interposed between the male screw portion C and the stopper E in the shaft body A (Patent Document 1). reference).

  By the way, the above-mentioned separator for formwork makes each positioning member B contact the inner surface of the formwork F, and screw the formwork tightening member G to the male thread portion C of the shaft A protruding outside the formwork F. By tightening, the interval of the formwork F is set.

  On the other hand, when removing the formwork from the solid concrete structure, the male screw portion C of the shaft body A is bent, for example, in the vertical direction so that the male screw portion C is separated from the main body portion of the shaft body A. However, as described above, in order to bend and cut the male screw portion C in the vertical direction, the vertical space of the male screw portion C is allowed to be allowed to swing in the internal space of the positioning member B formed in a bowl shape. In order to require an internal space and to ensure a large swing range in the vertical direction of the male screw portion C, it is necessary to widen the internal space.

  However, if the internal space of the positioning member B is formed to be large, the dent generated on the outer surface of the concrete structure due to the removal of the locating member B increases accordingly, and therefore the work for repairing the dent requires much labor. There is a bug.

Japanese Utility Model Publication No. 6-4258

  The present invention has been developed in view of the above circumstances, and the object of the present invention is to provide a male screw portion from the shaft main body without providing an internal space that allows the positioning member to swing in the vertical direction. It is an object of the present invention to provide a mold separator that can be easily separated.

  The invention according to claim 1 is a formwork separator comprising a shaft body having male screw portions at both ends in the length direction of the shaft body, and positioning members respectively attached to both ends in the length direction of the shaft body. In addition, at one end in the longitudinal direction of the male screw portion, there is provided a threading groove for separating the male screw portion from the shaft main body by a rotation operation with the axial center of the male screw portion with respect to the shaft main body as a fulcrum. In addition, the shaft body is provided with rotation preventing means for preventing rotation of the shaft body embedded in the concrete structure with the shaft center of the shaft body as a fulcrum.

  According to a second aspect of the present invention, in the formwork separator according to the first aspect, a position restricting means for restricting a loading position of the positioning member with respect to the positioning member loading portion is provided. To do.

  According to a third aspect of the present invention, the positioning member according to the first or second aspect includes a block body formed by compressing mortar, and the block body is provided with an insertion hole for the shaft body. It is characterized by being.

  Invention of Claim 4 is comprised from the cylinder part in which the said positioning member of Claim 1 can penetrate a shaft body, and the flange part which protrudes radially outward from the end of this cylinder part, The cylindrical portion is fixed to the loading portion of the shaft body.

  According to the first aspect of the present invention, after the concrete structure is formed by using the mold separator, the male screw portion is separated from the shaft main body only by rotating the male screw portion with its axis as a fulcrum using a tool. Therefore, it is possible to easily separate the male screw part from the shaft body without providing an internal space allowing the vertical swinging of the positioning member as in the prior art, and thus the outer surface of the completed concrete structure. The pits that occur in the wall can be made smaller, so that much effort is not required to repair the outer surface of the concrete structure.

  According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, since the loading position of the positioning member is accurately regulated by the position regulating means, the distance between the pair of molds is further increased. It can be reliably maintained.

  According to the invention described in claim 3, in addition to the effect of the invention described in claim 1 or 2, the positioning member is composed of a block body formed by compressing a cement material. Even if one end of the block body is left exposed to the outer surface of the concrete structure, the block body is integrated well with the concrete structure. Therefore, sufficient strength of the outer surface of the concrete structure can be secured.

    According to the invention of the fourth aspect, in addition to the effect of the invention of the first aspect, the trace after the removal of the position restricting means generated on the outer surface of the concrete structure becomes very shallow. Even if the marks are exposed on the outer surface of the concrete structure, it is unlikely to give a sense of discomfort.

The disassembled perspective view which shows one Embodiment of the separator for formwork concerning this invention. Explanatory drawing of the state which assembled | attached the separator for mold forms shown in FIG. 1 between mold forms. Sectional drawing of the principal part which shows the state which rotates the external thread part of the separator for formwork shown in FIG. Sectional drawing of the principal part which shows the state which removed the external thread part of the separator for mold forms shown in FIG. Sectional drawing of the principal part of the concrete structure completed with the separator for formwork shown in FIG. The partially omitted front view showing a second embodiment of the separator for formwork according to the present invention. The perspective view of the positioning member which comprises the separator for mold forms similarly. Explanatory drawing of the state which assembled | attached the separator for mold forms shown in FIG. 6 between the mold forms. Sectional drawing of the principal part which shows the state which rotates the external thread part of the separator for mold forms shown in FIG. Sectional drawing of the principal part which shows the state which removed the external thread part of the separator for formwork shown in FIG. Sectional drawing of the principal part of the concrete structure completed with the separator for formwork shown in FIG. The partially omitted front view showing a third embodiment of the separator for formwork according to the present invention. Sectional drawing of the principal part which shows the state which rotated and removed the external thread part of the separator for formwork shown in FIG. Sectional drawing of the principal part of the concrete structure completed with the separator for formwork shown in FIG. The partially abbreviated front view showing a conventional separator for formwork.

  Hereinafter, one embodiment of the separator for formwork concerning the present invention is described in detail.

First, FIG. 1 is an exploded perspective view showing an embodiment of a separator for formwork according to the present invention,
FIG. 2 is an explanatory diagram of a state in which the mold separator shown in FIG.
FIG. 3 is a cross-sectional view of the main part showing a state in which the male screw part of the formwork separator shown in FIG. 1 is rotated;
4 is a cross-sectional view of the main part showing a state where the male screw part of the formwork separator shown in FIG. 1 is removed;
FIG. 5 is a cross-sectional view of a main part of a concrete structure completed by the formwork separator shown in FIG.

   In FIG. 1 to FIG. 5, the formwork separator denoted by reference numeral 1 basically includes a shaft body 2, positioning members 3 mounted at both ends in the length direction of the shaft body 2, and positioning. The member 3 includes a retaining member 4 for preventing the member 3 from coming off the shaft body 2.

  The shaft body 2 includes a rod-shaped shaft main body 21 and a male screw portion 22 that is integrally extended in the axial direction from both ends in the length direction of the shaft main body 21. Are provided with a loading portion 23 for the positioning member 3 and the retaining member 4, and a twisted groove 24 positioned closer to the shaft body 21 than the loading portion 23.

  The twisted groove 24 has a V-shaped cross section, is formed on the entire outer periphery of the shaft main body 21, and is twisted by a rotation operation with the shaft center of the male screw portion 22 with respect to the shaft main body 21 as a fulcrum. Can be separated from the shaft main body 21.

  Further, a pair of rotation prevention means for preventing rotation of the shaft body 21 embedded in the concrete structure with the shaft center of the shaft body 21 as a fulcrum, inward of the twisted groove 24 in the shaft body 21. The rotation prevention piece 25 is extended outward in the radial direction.

  The rotation blocking piece 25 also has a role / function as a position restricting means described in the claims.

  In addition, you may provide a position control means in the loading part 23 separately.

  That is, one end in the axial direction of the positioning member 3 loaded in the loading unit 23 is received by the end edge of the rotation preventing piece 25, and the loading position of the positioning member 3 with respect to the loading unit 23 is restricted to a predetermined position. Yes.

  The positioning member 3 is basically composed of a substantially cylindrical block body 31 formed by compressing mortar, and a through-hole 32 through which the shaft body 2 can be inserted into the shaft core portion of the block body 31. Has been established.

  The inner diameter of the through hole 32 is slightly larger than the outer diameter of the shaft body 2.

  A ring-shaped washer 33 made of metal is embedded in the center of one end surface of the block body 31 in the axial direction.

  The washer 33 is for preventing the positioning member 3 from being damaged when contacting the rotation preventing piece 25.

  The retaining member 4 includes a retaining tube 41 formed in a cylindrical shape from a plastic material. The retaining tube 41 is provided with a slit 42 extending over the entire length in the length direction, and has a diameter on the outer peripheral surface. A pair of retaining pieces 43 extending outward in the direction are integrally projected.

  The retaining member 4 may be formed from a metal spring plate, for example.

  In the mold separator 1 having the above configuration, the positioning member 3 is inserted into both end portions in the length direction of the shaft body 2, and then the retaining member 4 is further inserted into both end portions in the length direction of the shaft body 2. The positioning member 3 and the retaining member 4 are loaded into the loading portion 23 of the shaft body 2 to prevent the positioning member 3 from being accidentally detached from the shaft body 2.

  In order to set the above-mentioned mold separator 1 between the pair of molds 5a and 5b, as shown in FIG. 2, the male screw part 22 of the shaft body 2 is passed through the through hole 51 provided in the molds 5a and 5b. When the male screw portion 22 is protruded out of the molds 5a and 5b and the mold fastening body 6 is screwed to the male screw portion 22, one end in the axial direction of the block body 31 constituting the positioning member 3 is interposed via the washer 33. The other end surface in the axial direction of the block body 31 abuts on the inner surface of the mold 5 and the loading position of the positioning member 3 is restricted to a predetermined position. The distance between the molds 5a and 5b is kept constant.

  On the other hand, if the concrete structure 7 is formed between the molds 5a and 5b, the mold fastening body 6 is first removed from the male screw portion 22, and the molds 5a and 5b are removed from the concrete structure 7.

  Subsequently, using a tool such as a spanner provided with a clamping part capable of clamping the male threaded part 22, the male threaded part 22 is clamped by this tool and the male threaded part 22 is forcibly rotated around its axis. Since the shaft main body 21 embedded in the concrete structure 7 cannot be rotated by the rotation preventing piece 25, the male screw portion 22 and the loading portion 23 serve as a fulcrum with respect to the shaft main body 21. 3 and is rotated by the threaded groove 24 by the rotation of the male threaded portion 22, so that the male threaded portion 22 and the loading portion 23 are connected to the shaft body 21 as shown in FIG. It is separated from.

  By the way, with the removal of the molds 5a and 5b, the block body 31 remains embedded in the concrete structure 7, but this block body 7 is formed by compressing mortar. As shown in FIG. 5, even if one end of the block is exposed to the outer surface of the concrete structure 7, there is no sense of incongruity, and the block body 31 is integrated with the concrete structure 7 with good compatibility. The strength of the outer surface of the object 7 can be sufficiently secured.

  After removing the male screw portion 22 and the loading portion 23, the through hole 32 of the block body 31 is filled with mortar bond or a caulking agent, or, as shown in FIG. The through hole 32 is preferably filled.

  Next, a second embodiment of the separator for formwork according to the present invention will be described with reference to FIGS.

First, FIG. 6 is a front view showing a second embodiment of the separator for formwork according to the present invention,
FIG. 7 is a perspective view of a positioning member that constitutes the mold separator,
FIG. 8 is an explanatory diagram of a state in which the mold separator shown in FIG.
FIG. 9 is a cross-sectional view of the main part showing a state in which the male thread part of the mold separator shown in FIG. 6 is rotated;
FIG. 10 is a cross-sectional view of the main part showing a state where the male screw part of the formwork separator shown in FIG. 6 is removed;
FIG. 11 is a cross-sectional view of a main part of a concrete structure completed by the formwork separator shown in FIG.

  The formwork separator indicated by reference numeral 10 in FIGS. 6 to 11 is basically composed of a shaft body 20 and positioning members 30 mounted on both ends of the shaft body 20 in the length direction. The

  The shaft body 20 includes a rod-shaped shaft main body 210 and a male screw portion 220 that is integrally extended in the axial direction from both ends in the length direction of the shaft main body 210. Are provided with a loading portion 230 of the positioning member 30 and a twisted groove 240 positioned closer to the shaft body 21 than the loading portion 230.

  The twist groove 240 has a V-shaped cross section, is formed on the entire outer periphery of the shaft main body 210, and is twisted by a rotation operation with the shaft center of the male screw portion 220 relative to the shaft main body 210 as a fulcrum. Can be separated from the shaft main body 210.

  Further, in the shaft body 210 inward of the twisting groove 240, rotation as a rotation preventing means for preventing rotation of the shaft body 210 embedded in the concrete structure with the shaft center of the shaft body 210 as a fulcrum. A blocking piece 250 extends outward in the radial direction.

  In addition, a rotation operation unit 260 including a pair of projecting pieces projecting radially outward is provided at the boundary between the male screw unit 220 and the loading unit 230.

  The positioning member 30 basically includes a cylindrical body 310 that can be inserted into the shaft body 210, and a disk-shaped positioning flange 320 that extends radially outward from the outer periphery of one end of the cylindrical body 310.

  In the positioning member 30, a slit 330 through which the rotation operation unit 260 can pass is formed in the cylindrical body 310, and a concave groove 340 through which the rotation operation unit 260 can also pass is formed in the inner peripheral edge of the positioning flange 320. Yes.

  The formwork separator 10 having the above-described configuration is configured such that the positioning member 30 is inserted through the male screw portion 220 of the shaft body 20 and passed through the rotation operation portion 260 through the slit 330 and the concave groove 340, and then the positioning member 30. The cylindrical body 310 is spot welded to the loading portion 230, and the positioning member 30 is fixed to a predetermined position of the shaft body 20.

  In order to set the above-mentioned mold separator 10 to the pair of molds 5a and 5b, the outer surface of the positioning flange 320 constituting the positioning member 30 is brought into contact with the inner surface of the molds 5a and 5b, and the mold The male screw part 220 of the shaft body 20 is passed through the through-hole 51 provided in 5a and 5b, and the male screw part 220 is projected out of the molds 5a and 5b.

  When the mold fastening body 6 is screwed to the male screw portion 220, the distance between the molds 5a and 5b can be kept constant via the positioning member 3.

  On the other hand, if the concrete structure 7 is formed between the molds 5a and 5b, the mold fastening body 6 is first removed from the male screw portion 220, and the molds 5a and 5b are removed from the concrete structure 7. Then, using a tool provided with a clamping part for clamping the rotation operation part 260, the male screw part 220 is rotated with its axis as a fulcrum from the state where the rotation operation part 260 is clamped by the clamping part of the tool. Since the shaft main body 210 embedded in the structure 7 cannot be rotated by the rotation preventing piece 250, the male screw portion 220 and the loading portion 230 together with the positioning member 30 are indicated by arrows X in FIG. 10, the threaded portion 240 is twisted and the male threaded portion 220 and the loading portion 230 are moved together with the positioning member 30 as shown in FIG. It is cut off.

  By the way, the disk-shaped groove 71 from which the positioning flange 320 is removed is formed on the outer surface of the concrete structure 7 by the removal of the positioning member 30, and this groove 71 is formed in a disk-like shape as shown in FIG. Since it is very shallow, even if the groove 71 is exposed on the outer surface of the concrete structure 7, it is unlikely to give a sense of incongruity.

  In addition, the mortar bond or the caulking agent is filled in the small-diameter deep hole 72 generated in the concrete structure 7 by removing the loading portion 230 of the shaft body 20 from the concrete structure 7, or as shown in FIG. Thus, for example, it is preferable that the deep hole 72 is filled by press-fitting a plastic plug P.

  Furthermore, a third embodiment of the separator for formwork according to the present invention will be described with reference to FIGS.

First, FIG. 12 is a front view showing a third embodiment of a separator for formwork according to the present invention,
13 is a cross-sectional view of the main part showing a state where the male thread portion of the mold separator shown in FIG. 12 is rotated and removed, and FIG. 14 is an essential part of the concrete structure completed by the mold separator shown in FIG. It is sectional drawing of a part.

  12 to 14 is basically composed of a shaft body 200 and positioning members 300 respectively attached to both ends of the shaft body 200 in the length direction. The

  The shaft body 200 includes a rod-shaped shaft main body 211 and a male screw portion 221 that is integrally extended in the axial direction from both ends in the length direction of the shaft main body 211. Are provided with a loading portion 231 of the positioning member 300, a twisted groove 241 positioned closer to the shaft body 211 than the loaded portion 231, and an engagement flange 242 adjacent to the twisted groove 241.

  The twisted groove 241 has a V-shaped cross section, is formed on the entire outer periphery of the shaft main body 211, and is twisted off by a rotation operation with the shaft center of the male screw portion 221 with respect to the shaft main body 211 as a fulcrum. Can be separated from the shaft main body 211.

  Further, inwardly of the twisted groove 241 in the shaft main body 211, rotation as a rotation preventing means for preventing rotation of the shaft main body 211 embedded in the concrete structure with the shaft center of the shaft main body 211 as a fulcrum. A blocking piece 251 is extended radially outward.

  The positioning member 300 includes a stepped cylindrical body 311 in which a truncated cone-shaped large-diameter cylindrical portion 311a and a small-diameter cylindrical portion 311b are coaxially formed.

  The positioning member 300 is made of a plastic material and can be inserted through the shaft body 211 described above.

  In the formwork separator 100 having the above configuration, the positioning member 300 is inserted into the male screw portion 221 of the shaft body 200 and loaded into the loading portion 231 of the shaft body 200.

  In order to set the above-described mold separator 100 to the pair of molds 5a and 5b, the outer surface of the positioning member 300 is brought into contact with the inner surfaces of the molds 5a and 5b, and the molds 5a and 5b are brought into contact with each other. The male screw portion 221 of the shaft body 20 is passed through the provided through-hole 51 to project the male screw portion 221 out of the mold frames 5 a and 5 b, and the mold frame tightening body 6 is screwed to the male screw portion 221.

  As a result, one end in the axial direction of the cylindrical body 311 constituting the positioning member 300 is received by the engagement flange 242 and the other end surface in the axial direction of the cylindrical body 311 contacts the inner side surface of the mold 5. The loading position of the positioning member 300 is restricted to a predetermined position, and the interval between the molds 5a and 5b is kept constant.

  On the other hand, if the concrete structure 7 is formed between the molds 5a and 5b, the mold fastening body 6 is first removed from the male screw portion 221 and the molds 5a and 5b are removed from the concrete structure 7.

  Subsequently, the male threaded portion 221 is sandwiched by a tool such as a spanner and the male threaded portion 221 is forcibly rotated with the shaft core as a fulcrum, and the shaft main body 211 embedded in the concrete structure 7 is used. Since the rotation preventing piece 251 is not rotatable, the male screw portion 221 rotates together with the loading portion 231 with respect to the shaft main body 211 as a fulcrum, and the rotation of the male screw portion 221 causes the threaded groove 241 portion to rotate. As shown in FIG. 13, the external thread portion 221 and the loading portion 231 are separated from the shaft main body 211 together with the positioning member 300.

  By the way, the groove 711 is formed on the outer surface of the concrete structure 7 by the removal of the positioning member 30 due to the detachment of the positioning member 300. The groove 711 is filled with mortar bond or a caulking agent. As shown in FIG. 5, for example, a concrete plug Q may be press-fitted to fill the groove 711.

  In each of the embodiments described above, the rotation prevention pieces 25 and 250 are provided at both ends in the length direction of the shaft main bodies 21 and 210, but may be provided at intermediate portions in the length direction.

1, 10, 100 Formwork separator 2, 20, 200 Shaft body 22, 220, 221 Male thread part 25, 250, 251 Rotation prevention piece 24, 240, 241 Threaded groove 3, 30, 300 Positioning member 32 Through hole 4 Retaining members 5a and 5b Formwork 6 Formwork fastening body 7 Concrete structure

Claims (4)

  A separator for a formwork comprising a shaft body provided with male threaded portions at both ends in the length direction of the shaft body, and positioning members respectively mounted at both lengthwise ends of the shaft body, wherein the length of the male threaded portion One end of the direction is provided with a threading groove for separating the male screw portion from the shaft body by a rotation operation with the positioning member loading portion and the shaft center of the male screw portion with respect to the shaft body as a fulcrum. A mold separator comprising a rotation prevention means for preventing rotation of the shaft body embedded in the concrete structure with the shaft center of the shaft body as a fulcrum.   The formwork separator according to claim 1, further comprising a position restricting means for restricting a loading position of the positioning member with respect to the positioning member loading portion.   The mold according to claim 1 or 2, wherein the positioning member includes a block body formed by compressing mortar, and the block body is provided with an insertion hole for the shaft body. Frame separator.   The positioning member includes a cylindrical portion through which the shaft body can be inserted, and a flange portion protruding radially outward from one end of the cylindrical portion, and the cylindrical portion is fixed to the loading portion of the shaft body. The separator for formwork according to claim 1, wherein:

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