JP2010281045A - Fastener and form fixing bracket - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fastener which enables the efficient performance of the operation of unscrewing a nut member by an electric power tool, without increasing an economic burden on equipment; and to provide a form fixing bracket. <P>SOLUTION: This form fixing bracket 20, which is fastened to a form fixing screw 18a protruding to the outside of a form panel 11, makes end materials 12 and 13 installed in the state of being fixed to the outside of the form panel 11. The form fixing bracket 20 includes: a bolt member 21 which is screwed to a form fixing screw 18a; the nut member 22 which is screwed to a screw portion 21c of the bolt member 21; and a holding member 23 which sandwiches the end materials 12 and 13 between the form panel 11 and itself. A screw hole 21b for being screwed to the form fixing screw 18a is formed at the base end of the bolt member 21; an operation portion 21d both for preventing the coming-off of the nut member 22 and for operating the bolt member is formed at the leading end of the bolt member 21; and a straight portion 21e, which enables the idle motion of the nut member 22, is formed between the operation portion 21d and the screw portion 21c. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a fastening metal fitting and a mold fixing metal fitting that can be suitably used for construction and disassembly of a mold.

  As a formwork structure for construction of a concrete structure, a formwork panel is arranged along the outer surface of the structure, a cone member is screwed to both ends of a separator made of a rod-like member, and a screw part of the cone member is molded. Attach to the mounting hole formed in the frame panel from the inside, screw the rod-like connecting member into the threaded portion protruding to the outer surface side of the mold panel, sandwich the mold panel between the cone member and the connecting member, The formwork panel is fixed to the end of the separator, the end members made of round pipes and square pipes are arranged on both the upper and lower sides and the left and right sides of the connecting member, and the holding member for holding the end member is attached to the connecting member. In this state, a nut member is fastened to the end of the connecting member, and the end material is sandwiched between the holding member and the formwork panel, so that the formwork panel is reinforced from the back side is widely implemented. (For example, see Patent Document 1). .

  By the way, as the connecting member, one in which a screw hole to be screwed into the screw portion of the cone member is formed at one end portion and a screw portion to be screwed into the nut member is formed at the other end portion is employed. Further, in order to prevent the holding member and the nut member from being lost, the holding member is inserted in the middle of the connecting member and the nut member is screwed into the screw portion, and then the connecting member is attached to the end of the connecting member. Formwork fixing brackets in which an operating portion for rotating operation is formed by caulking and a holding member and a nut member are integrated with a connecting member have been put into practical use. In addition, a power tool socket dedicated to such a mold fixing bracket has been proposed and put into practical use (see, for example, Patent Document 2).

Japanese Patent Laid-Open No. 9-242334 Japanese Utility Model Publication No. 5-78810

  By the way, when a formwork panel is constructed or disassembled using a formwork fixing bracket in which a holding member and a nut member are integrated with a connection member, a socket that fits the nut member and an operation of the connection member are performed. The power tool is used with two sockets that are suitable for the part, but when the nut member is unscrewed for disassembly of the formwork, the power tool power switch disconnection timing is delayed, and the nut member Rotates excessively in the unscrewing direction, and the nut member is engaged with the operation portion, the thread of the nut member is damaged, and the mold fixing bracket cannot be reused. Further, even if the thread is not damaged, it is necessary to hit the nut member that has been bitten with a humbar or the like to release the biting of the nut member, and there is a problem that the operation becomes complicated.

  On the other hand, when the socket as described in Patent Document 2 is used, the nut member and the connecting member can be unscrewed at the same time, so that the above problems can be prevented. However, since the positional relationship between the nut member and the operation portion is determined, when different lengths are used as the connecting members, it is necessary to prepare a plurality of types of sockets according to the mold to be disassembled. Moreover, since it is necessary to fasten the connecting member and the nut member independently at the time of formwork construction, as in the past, there are two sockets: a socket that fits the nut member and a socket that fits the operation part of the connecting member. There is a problem that the burden on the equipment is increased by the purchase of a socket dedicated for dismantling.

  The object of the present invention is to reliably prevent the nut member from biting into the operation portion of the bolt member when loosening the nut member without increasing the equipment economical burden, and to unscrew the nut member by the electric tool. It is to provide a fastening bracket and a mold fixing bracket capable of efficiently performing work.

  The fastening bracket according to the present invention includes a bolt member and a nut member screwed to the bolt member, and forms an operation portion for preventing the nut member from dropping and operating the bolt member at a tip portion of the bolt member. And a straight portion where the nut member can idle.

  In this fastening bracket, the fastening bracket is constructed or disassembled using two sockets, one suitable for the operation part and the other suitable for the nut member. Since the nut part is formed with a straight part that can be idled between the parts, even if the nut member is excessively rotated in the loosening direction when removing the nut member from the bolt member with the electric tool, the nut member The nut member idles in the straight portion and does not move further in the unscrewing direction, so that the nut member can be reliably prevented from being caught in the operation portion. For this reason, the problem caused by the nut member biting into the operation portion, that is, the screw thread of the nut member is damaged, the mold fixing bracket cannot be reused, or the work of releasing the bited nut member becomes complicated. Can be prevented from occurring. In addition, since the nut member slips in the straight part, it is possible to prevent the nut member from dropping off from the bolt member due to vibration during transportation of the fastening bracket, and to prevent loss of the bolt member and nut member. Even when the nut member of the fastener is loosened due to vibration or the like, it is possible to reliably prevent a problem that the nut member falls off from the bolt member.

  The formwork fixing metal fitting according to the present invention is a formwork fixing metal fitting fastened to a formwork fixing screw projecting to the outside of the formwork panel to fix and install an end material for formwork reinforcement outside the formwork panel. A bolt member fastened to the mold fixing screw, a nut member screwed to the bolt member, and a bolt member proximal to the nut member, and the nut member is fastened to the bolt member. And a holding member that clamps the end material with the formwork panel, a screw hole that is screwed into the formwork fixing screw is formed at the base end portion of the bolt member, and a nut member is formed at the tip end portion of the bolt member Of the bolt member, and a straight portion where the nut member can idle is formed between the screw portion and the operation portion of the bolt member.

  When constructing a formwork panel using this formwork fixing bracket, first, the socket of the electric tool is fitted to the operation part of the bolt member, and the bolt member is attached to the formwork fixing screw protruding outward from the formwork panel. After that, in a state where the end material is arranged between the formwork panel and the holding member, the socket is replaced for the nut member, and the nut member is fastened with an electric tool, and between the formwork panel and the holding member. The formwork will be constructed with the end material sandwiched.

  Also, when disassembling the formwork, first the nut member is loosened with the electric tool. At this time, even if the nut member is excessively rotated in the loosening direction, the nut member moves to the straight portion. Since the nut member idles in the straight portion and does not move further in the unscrewing direction, it is possible to reliably prevent a problem that the nut member bites into the operation portion. In this way, after the nut member is loosened and the end material is removed, a dedicated socket fitted to the operation portion is attached to the electric tool, the bolt member is removed from the formwork fixing screw, and the formwork is disassembled. Note that the length of the bolt member from the end on the mold panel side to the straight portion is such that at least the nut member is fitted to the straight portion, the holding member is moved to the nut member side, The length is set such that a gap is formed between the frame panels so that the end material can be attached and detached.

  In the mold fixing bracket, it is preferable that the straight portion is formed up to the tip of the bolt member, and the operation portion is formed by caulking both side portions of the tip of the straight portion. In this case, the operation unit can be processed at a low cost as in the conventional case. In addition, also in the said fastening metal fitting, the operation part can be formed by crimping the both sides of a straight part.

  It is also a preferred embodiment to form a flange that contacts the formwork panel at the base end of the bolt member. In this case, it is possible to appropriately adjust the surface pressure against the formwork panel at the time of tightening the bolt member according to the size of the collar portion without using a washer or the like.

  A washer can be inserted into the bolt member between the nut member and the holding member. In this case, since the mold fixing bracket made up of the nut member, the holding member, the bolt member, and the washer can be handled as one component, the loss of these components can be reliably prevented.

  According to the connection metal fitting and the mold fixing metal fitting according to the present invention, the nut member is engaged with the operation portion with a simple configuration in which the nut member is idled between the screw portion and the operation portion of the bolt member. This can be reliably prevented, and the problem that the nut member bites into the operation part, that is, the thread of the nut member is damaged, and the connecting bracket and the mold fixing bracket cannot be reused, or the nut member It is possible to prevent the occurrence of the problem that the release work becomes complicated. In addition, since the nut member idles in the straight part, it is possible to prevent the nut member from dropping off from the bolt member due to vibration during transportation of the fastening bracket and formwork fixing bracket, and to prevent loss of the bolt member and nut member. In addition, even when the nut member of the installed fastener is loosened due to vibration or the like, it is possible to reliably prevent a problem that the nut member falls off from the bolt member.

  In addition, in the case of the mold fixing bracket, the nut member can be operated even when the mold fixing bracket is disassembled by using two sockets, a socket suitable for the operation part and a socket suitable for the nut member, as in the past. Therefore, it is possible to efficiently dismantle the formwork without using a socket dedicated to disassembly as described in Patent Document 2, as in the case of using a socket dedicated to disassembly. In addition, there is no increase in equipment economic burden.

Longitudinal sectional view of the formwork structure at the placement position of the formwork fixing bracket Perspective view of mold fixing bracket Explanatory drawing when nut member is unscrewed Explanatory drawing of nut member idling Explanatory drawing when unscrewing bolt members Sectional view taken along line VI-VI in FIG. Explanatory drawing at the time of unscrewing bolt members of other configurations VIII-VIII sectional view of FIG.

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, a formwork structure 10 for constructing a concrete structure includes a formwork panel 11 arranged along the outer surface of the construction position of the structure, and a pair of formwork panels 11. A mold installation tool 14 for holding and holding a vertical end member 12 and a lateral end member 13 for receiving concrete pouring pressure is provided on the back side of both mold panel 11 while being held in parallel at a set interval.

  The formwork installation tool 14 is a rod-like separator 15 disposed substantially horizontally between a pair of formwork panels 11 arranged in parallel, and a cone member 16 screwed to both ends of the separator 15. A cone member 16 having a formwork fixing screw 18a that passes through the frame panel 11 and protrudes to the outer surface side of the formwork panel 11, and a base end portion is screwed to the formwork fixing screw 18a outside the formwork panel 11 The bolt member 21 that clamps the formwork panel 11 with the cone member 16, the nut member 22 screwed into the screw portion 21 c of the bolt member 21, and the formwork panel 11 side of the bolt member 21 with respect to the nut member 22 By inserting the nut member 22 to the bolt member 21 and inserting the vertical end member 12 and the horizontal end member 13 between the mold member 11 and the both end members 12 and 13. Back of And a holding member 23 fixedly holds the side. And the formwork panel 11 is constructed by attaching the formwork installation tool 14 to the pair of formwork panels 11 arranged in parallel at the set intervals in the vertical direction and the left-right direction.

  The formwork panel 11 is composed of a wooden plate-like member such as plywood, or a plate-like member made of a metal material or a synthetic resin material, and an attachment hole made of a through hole is provided at the attachment position of the cone member 16 in the formwork panel 11. 11a is formed. The thickness of the formwork panel 11 and the arrangement pitch of the mounting holes 11a can be appropriately set according to the concrete pressure to be placed.

  The separator 15 has a well-known configuration made of a metal rod-like member, and screw portions 15a are formed at both ends thereof, and a rotation-preventing projection (not shown) is formed in the middle portion. The diameter and length of the separator 15 are appropriately set according to the size of the concrete structure.

  The cone member 16 has a well-known configuration including a synthetic resin cone body 17 and a shaft member 18 integrally provided at the center of the cone body 17 by insert molding or the like. A mold fixing screw 18a protruding outward from the cone body 17 is formed, and a screw hole 18b into which the screw portion 15a of the separator 15 is screwed is formed at the other end portion of the shaft member 18. However, as the cone member 16, a known configuration other than the configuration shown in FIG. 1 can be adopted.

  The vertical end member 12 and the horizontal end member 13 receive the concrete pressure placed between the formwork panels 11 from the back side of the formwork panel 11 and are constituted by metal pipe members made of round pipes or square pipes. The bolt member 21 is disposed on both the upper and lower sides and the left and right sides. However, it is also possible to employ wooden squares or the like as the end members 12 and 13.

  As shown in FIGS. 1 and 2, the bolt member 21, the nut member 22, and the holding member 23 constitute a mold fixing bracket 20 as an integral part that cannot be disassembled. However, the mold fixing metal fitting 20 is also a preferred embodiment in which a washer is inserted into the bolt member 21 between the nut member 22 and the holding member 23.

  A flange 21a that is pressed against the mold panel 11 is integrally formed at the base end of the bolt member 21, and a screw hole that engages with the mold fixing screw 18a at the center of the base end of the bolt member 21. 21b is formed. In the mold panel 11, a mold fixing screw 18 a of the cone member 16 is provided so as to protrude from the inner side of the mold panel 11 through the attachment hole 11 a and project to the outer surface side of the mold panel 11. Is connected to the cone member 16 by screwing the formwork fixing screw 18a into the screw hole 21b, and the formwork panel 11 is sandwiched between the flange portion 21a and the cone body 17 to be attached to the formwork panel 11. Fixed. Then, by sequentially fixing the cone member 16 to the formwork panel 11 in this way, a pair of formwork panels 11 are arranged in parallel at a set interval via the plurality of separators 15 and the cone member 16. become.

  A screw portion 21c into which the nut member 22 is screwed is formed between the central portion in the length direction of the bolt member 21 and the vicinity of the tip, and the nut member 22 is prevented from falling off and used to operate the bolt member at the tip of the bolt member 21. An operation portion 21d is formed, and a straight portion 21e in which the nut member 22 can idle is formed in the bolt member 21 between the operation portion 21d and the screw portion 21c.

  The screw portion 21c is preferably formed with an RB screw having a semicircular cross-sectional thread since the feeding amount is large, the workability is good, and the peelability of the attached concrete is good. It is also possible to form a screw having a known configuration such as a screw or a trapezoidal screw.

  The diameter of the straight part 21e is configured to be smaller than the inner diameter of the nut member 22, the length L of the straight part 21e is set to be longer than the thickness of the nut member 22, and the nut member 22 is configured to idle at the straight part 21e. Has been.

  As the operation portion 21d, any configuration that is formed by machining or press molding may be adopted as long as it can be operated by the existing socket 30 in which the rectangular hole 30a is formed. it can. In particular, as in the operation portion 21dA shown in FIGS. 5 and 6, it is efficient to form the straight portion 21e up to the distal end portion of the bolt member 21 and caulk both sides of the distal end portion of the straight portion 21e. This is preferable because it can be manufactured at low cost. Further, like the operation portion 21 dB shown in FIGS. 7 and 8, the straight portion 21 e can be formed up to the distal end portion of the bolt member 21, and the distal end portion of the straight portion 21 e can be caulked flat in the diameter direction. . The outer dimension of the operation portion 21d is set to be larger than the inner diameter of the nut member 22, and the nut member 22 moved to the straight portion 21e is configured not to drop off from the straight portion 21e.

  The holding member 23 has a flat plate-like connecting wall 23a whose both ends are gently curved, and side wall portions 23b extending from both side edges of the connecting wall 23a in the bending direction of the connecting wall 23a, and press-molding a metal plate. It consists of a member having a U-shaped cross section. An insertion hole 23c through which the screw portion 21c of the bolt member 21 is inserted is formed in the central portion of the connecting wall 23a, and an arc-shaped holding portion 23d that fits the outer periphery of the lateral end member 13 is formed in the side wall portion 23b. .

  The mold fixing metal fitting 20 allows the holding member 23 to be inserted into the bolt member 21, and the nut member 22 is screwed into the screw portion 21 c of the bolt member 21. It is connected so as not to fall apart. Further, since the nut member 22 idles in the straight portion 21e, it is possible to prevent the nut member 22 from dropping off from the bolt member 21 due to vibration during transportation of the fastening bracket, and to prevent the bolt member 21 and the nut member 22 from being lost. In addition, even when the nut member 22 of the installed fastener is loosened due to vibration or the like, it is possible to reliably prevent a problem that the nut member 22 falls off from the bolt member 21.

  Next, a method for constructing a mold using the mold fixing bracket 20 will be described. 1, FIG. 3 to FIG. 5 and FIG. 7 are explanatory diagrams at the time of formwork dismantling after the construction of the concrete structure. Therefore, it is assumed that the concrete 32 has not yet been placed in the description at the time of construction of the formwork, and will be described using these drawings.

  First, the formwork panel 11 is installed along the construction position of the structure. Next, the cone member 16 is fixed to both ends of the separator 15, and the mold fixing screw 18 a of the cone member 16 is protruded outward from the mold panel 11, so that the space between the two mold panels 11 arranged in parallel is set. The separator 15 and the cone member 16 are provided in an erected shape.

  Next, as shown in FIG. 5, the bolt member 21 is screwed into the mold fixing screw 18a protruding outward from the mold panel 11, and the socket 30 is fitted into the operation portion 21d of the bolt member 21, thereby The bolt member 21 is tightened with a tool, the mold panel 11 is sandwiched between the flange 21a of the bolt member 21 and the cone member 16, and the separator 15 and the cone member 16 are fixed to the mold panel 11. The panel 11 is connected and held in parallel at a predetermined interval, and the bolt member 21 is fixed to the formwork panel 11.

  In this manner, the separator 15 and the cone member 16 are fixed to the mold panel 11 and the bolt member 21 is sequentially fixed. Then, as shown in FIG. The vertical end member 12 is disposed on both sides of the bolt member 21, the horizontal end member 13 is disposed on both the upper and lower sides of the bolt member 21, and the holding member 23 is disposed on the outer surface side of the horizontal end member 13. The socket 31 is externally fitted, and the work of tightening the nut member 22 with an electric tool is sequentially performed as shown in FIG. 3, and the formwork is constructed as shown in FIG.

  After the formwork is thus constructed, the concrete 32 is placed in the space between the formwork panels 11, the concrete 32 is cured and solidified for a predetermined period, the structure is constructed, and then the formwork is disassembled. .

  At the time of disassembling the formwork, as shown in FIG. 3, the socket 31 is externally fitted to the nut member 22, the nut member 22 is loosened sequentially, and the vertical end member 12 and the horizontal end member 13 are moved in the reverse order. Will be removed. At this time, even if the nut member 22 is loosened too much, as shown in FIG. 4, when the nut member 22 moves to the position of the straight portion 21e, the nut member 22 idles in the straight portion 21e, and the nut member further exceeds that. Since 22 does not move in the unscrewing direction, it is possible to reliably prevent the nut member 22 from biting into the operation portion 21d. For this reason, a problem caused by the nut member 22 biting into the operation portion 21d, that is, the thread of the nut member 22 is damaged, the mold fixing bracket 20 cannot be reused, or the biting operation of the nut member 22 is released. Can be prevented from occurring.

  Thus, after loosening the nut member 22, as shown in FIG. 5, the socket 30 is externally fitted to the operation portion 21d, the bolt member 21 is removed with the electric tool, and the mold panel 11 is removed to complete the disassembly. become. Since the tip of the mold fixing screw 18a protrudes from the outer surface of the structure, the tip side portion of the mold fixing screw 18a is formed at its base by hitting the mold fixing screw 18a with a hammer. The groove portion 18c is broken and removed.

  In this embodiment, the case where the present invention is applied to the mold fixing metal fitting 20 has been described. However, the present invention can also be applied to fastening metal fittings other than the mold fixing metal fitting 20. Specifically, the bolt member 21 and a nut member 22 screwed to the bolt member 21 are formed, and an operation portion 21d for preventing the nut member 22 from dropping and operating the bolt member is formed at the tip of the bolt member 21, and the operation portion 21d The present invention can be applied to a fastening bracket for any application as long as the straight portion 21e in which the nut member 22 can idle is formed between the screw portions 21c.

DESCRIPTION OF SYMBOLS 10 Formwork structure 11 Formwork panel 11a Mounting hole 12 Vertical end material 13 Horizontal end material 14 Formwork installation tool 15 Separator 15a Screw part 16 Cone member 17 Cone body 18 Shaft member 18a Formwork fixing screw 18b Screw hole 18c Groove part 20 Type Frame fixing bracket 21 bolt member 21a flange 21b screw hole 21c screw portion 21d operation portion 21dA operation portion 21dB operation portion 21e straight portion 22 nut member 23 holding member 23a connecting wall 23b side wall portion 23c insertion hole 23d holding portion 30 socket 30a square hole 31 Socket 32 Concrete

Claims (5)

  A bolt member and a nut member screwed to the bolt member, and an operation portion for preventing the nut member from falling off and for operating the bolt member is formed at a tip portion of the bolt member, and the nut member is interposed between the screw portion and the operation portion of the bolt member. Fasteners characterized by forming a straight part that can be idle. A mold fixing bracket that is fastened to a mold fixing screw that protrudes to the outside of the mold panel, and that fixes and installs an end material for reinforcing the mold on the outside of the mold panel,
A bolt member fastened to the mold fixing screw, a nut member screwed into the bolt member, a bolt member closer to the base end than the nut member is inserted, and the nut member is fastened to the bolt member. A holding member that holds the end material between the frame panel and
Forming a screw hole to be screwed into the mold fixing screw at the base end of the bolt member;
Forming an operation part for preventing the nut member from dropping and operating the bolt member at the tip of the bolt member,
A straight portion is formed between the screw portion and the operation portion of the bolt member so that the nut member can idle,
Formwork fixing bracket characterized by that.   The mold fixing bracket according to claim 2, wherein the straight portion is formed up to a tip portion of the bolt member, and the operation portion is formed by caulking both side portions of the straight portion.   The mold fixing metal fitting according to claim 2 or 3, wherein a flange that abuts the mold panel is formed at a base end of the bolt member. The mold fixing bracket according to any one of claims 2 to 4, wherein a washer is inserted and disposed in the bolt member between the nut member and the holding member.

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