JP2011174356A - Holder of insert fitting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a holder of insert fittings, which is inexpensive and is also excellent in convenience. <P>SOLUTION: The holder 11a is composed of a cylindrical body 13 which can fit the body 22 of the insert fittings 21, and a central body 15 which enters into the body 22, while a fastener 19a driven into a form P is inserted through the central body 15. The cylindrical body 13 can firmly retain the insert fittings 21 for covering the lower outer periphery of the insert fittings 21, and thus, is excellent in reliability. Furthermore, the holder 11a has a simple shape by integrally molding the cylindrical body 13 and the central body 15 and inserting the fastener 19a into the central body 15, so that a manufacturing price can be supressed, while the fastener 19a can easily be pulled out of the form P for reuse without problems. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a holder for an insert fitting used when embedding the insert fitting in various concrete structures.

  Insert metal fittings are used to attach piping and wiring to various concrete structures such as buildings and box culverts, and are fixed to the inner surface of the formwork when placing ready-mixed concrete. An example of the shape and use of a general insert fitting is shown in FIG. As shown in this figure, the insert fitting has a flange formed on the upper end surface of the cylindrical body. When this insert metal fitting is fixed to the inner surface of the formwork, a dedicated holder is required.

  The insert fitting of FIG. 7 has an entrance hole formed in the lower end surface of the body portion, and a female screw is formed in the interior of the entrance hole. Further, the socket is a cylindrical resin molded product that is colored in various ways, and is used to identify the use of the insert fitting. The body of the insert fitting can be press-fitted into the inner hole thereof. Next, the holder is composed of a shaft portion that is inserted into the inner hole, a skirt portion that is in close contact with the mold, and a nail that passes through the center. At the time of construction, a nail is driven into the formwork and the skirt is set, and then a socket is inserted into the shaft part to fix the insert fitting to the formwork. Then, after the concrete solidifies, when the holder is removed together with the mold, an entrance hole and a female screw are exposed on the surface of the concrete.

  The following patent documents are published about the insert metal fittings. In Document 1, an adsorbing tool is interposed between a mold and an insert body, and a magnet is incorporated into the adsorbing tool and adsorbed on the mold. Because the magnet is used, the formwork is not changed, and the attachment / detachment work is very simple, but the wooden formwork cannot be used. Reference 2 also supports the nail to be struck to the formwork with the nail holding part, so that the nail can be driven stably, and when removing the formwork, the nail does not remain in the formwork. Can be easily reused. Further, Document 3 has a structure in which a screw shaft body integrated with a nail can be screwed into a female screw of an insert, and the nail is integrated with the insert through the screw. Therefore, when removing the mold, The nail is pulled out from and remains on the insert. Therefore, it is easy to reuse the formwork.

JP-A-6-185125 JP 2008-075395 A JP 2008-111277 A

  In addition to the global economic crisis triggered by the so-called Lehman shock that started in 2008, the construction industry is in trouble because of factors such as the reduction of public works and the declining birthrate in Japan. Therefore, in the industry, fierce cost-cutting competition has been developed in order to secure orders, and for insert fittings, it is required to lower the product unit price and reduce the construction cost. Particularly in a large-scale building, the amount of use becomes enormous and the demand for cost reduction becomes more severe. Against this background, improvement in workability and reduction in product prices are also required for the holders used when fixing the insert fitting to the formwork.

  The present invention has been developed on the basis of such a situation, and an object thereof is to provide a holder for an insert fitting that is low in price and excellent in convenience.

  The invention according to claim 1 for solving the above-mentioned problems is a bottomed tubular body that is used to fix the insert fitting to the formwork and can fit the body of the insert fitting, and the tubular body. And a center body that protrudes from the bottom of the body and enters the inside of the body portion, and a fastener that is driven into the mold passes through the center body.

  The holder for the insert fitting according to the present invention is a tubular body that is formed into a tubular shape and closed at the bottom in a form that is driven into a mold using a fastener such as a nail, and an inner peripheral side of the tubular body. And a central body projecting from the bottom of the cylindrical body. Although these materials are free, a synthetic resin having appropriate elasticity is optimal. The cylindrical body has an inner diameter slightly smaller than the outer periphery of the body portion of the insert metal fitting, and the insert metal fitting can be held by press-fitting the body portion into close contact with each other. When the holder is attached to the mold, the bottom of the cylindrical body comes into surface contact with the mold.

  In this way, by directly holding the body of the insert fitting with the cylindrical body, the socket shown in FIG. 7 is not necessary, and the entire lower part of the body is covered with the cylindrical body, so that the insert fitting is strengthened. And can withstand the fluid pressure when pouring the ready-mixed concrete, and the insert fitting can be embedded in a predetermined position without error.

  The central body is disposed on the inner peripheral side of the cylindrical body and has a function for inserting a fastener such as a nail. Therefore, a vertical hole penetrating in the axial direction is formed at the center of the central body. It is preferable to take measures such that the inner diameter of the vertical hole is slightly smaller than the outer diameter of the fastener so that the inserted fastener is not easily detached from the vertical hole. Further, the central body and the cylindrical body are arranged concentrically, and in principle, they are integrally formed. Furthermore, the size of the central body needs to be determined according to the internal shape of the insert fitting to be fitted.

  The fastener is used to fix the entire holder to the formwork. In the present invention, only one piece is used for one holder, and is inserted into the vertical hole of the center body at the manufacturing stage. And integrate. Therefore, in a normal use state, the fastener does not come off from the holder. Specific examples of the fastener include a flat head nail and a screw nail, and a drill screw capable of simultaneously drilling and threading when the formwork is a steel plate.

  The invention according to claim 2 relates to the shape of the central body, and is characterized in that a small-diameter portion with a reduced cross section is provided at the tip of the central body. The central body is a shaft-shaped part accommodated in the body part of the insert fitting, but the small-diameter part according to the present invention is a part obtained by reducing the cross-section of the tip part of the central body.

  Even after the concrete is solidified and the mold is removed, the holder is integrated with the mold by a fastener such as a nail. However, the holder can be removed from the mold and reused. At that time, if the fastener is a simple flat-headed nail, a general-purpose nail remover may be used. However, in the holder according to the present invention, the fastener (flat-headed nail) is integrated with the central body, and the head of the nail It may be difficult to nail it. However, by providing the details, the outer edge of the head is opened, and nail removal can be used without any trouble. The central body needs to secure strength, and it is difficult to reduce the diameter of the whole body.

  The invention described in claim 3 relates to the shape of the cylindrical body, and is characterized in that an air vent hole penetrating the front and back surfaces is provided at the bottom of the cylindrical body. In this invention, the outer peripheral surface of the trunk | drum of an insert metal fitting and the inner peripheral surface of a cylindrical body are closely_contact | adhered without gap. Therefore, when the insert fitting is inserted into the cylindrical body, there is no air escape path in the trunk portion, the internal pressure increases as the insertion proceeds, and workability may deteriorate. In order to solve this problem, it is possible to provide an air vent hole at the bottom as in the present invention so that the internal pressure does not increase.

  The invention according to claim 4 is for improving the convenience of the holder. The collar has a divergent shape and a collar having a slidable neck on the outer peripheral surface of the cylindrical body, and the outer peripheral surface of the cylindrical body. Is characterized in that ridges for regulating the movement of the neck are formed in the circumferential direction.

  The present invention is characterized by incorporating a collar into the holder. The collar is manufactured separately from the holder and is left in the concrete together with the insert metal fitting. By changing the color according to the use of the insert metal fitting, the piping work can be carried out smoothly. Specifically, if it is decided that the insert metal fitting that incorporates the red color is for electrical wiring, and the blue color is for water supply piping, the installer of the wiring and piping will not have to worry about the insertion fitting depending on the application. It can be selected and can contribute to the smooth execution of work.

  The collar has a cross-section of “8” in the cross-section, and is incorporated so as to cover the outer periphery of the cylindrical body. The lower part of the neck is widened. Therefore, when a cylindrical body is inserted into the neck, both can move freely while sliding. The ridge is a portion protruding so as to surround the outer peripheral surface of the cylindrical body, and has a function of restricting the free movement of the collar. When the holder is fixed to the formwork, the collar is the ridge. And sandwiched between the formwork.

  The protrusions need not be able to simply restrict the movement of the collar, but must be large enough to be elastically deformed and pass through the collar neck when a large external force is applied. By allowing deformation of the ridges in this way, when the concrete is solidified and the formwork is removed, the entire holder can pass through the collar, leaving only the collar on the concrete surface.

  The invention described in claim 5 is for obtaining the same effect as the collar described in the invention described in claim 4, and is provided with a disk-shaped ring on the lower outer periphery of the cylindrical body, and the ring and the cylindrical body. Are integrated through a plurality of fragile pieces that can be broken by external force. The ring has a disk shape that extends substantially parallel to the mold, and is located on the outer periphery of the lower part of the cylindrical body. When the holder is fixed to the mold, the ring comes into surface contact with the mold. And when concrete solidifies and removes a formwork, a ring is cut | disconnected from a holder and remains on the surface of concrete. Therefore, if the color of the ring is changed according to the use of the insert metal fitting, the same effect as the previous color can be obtained.

  The ring needs to be separated from the cylindrical body when the formwork is removed, and in order to realize this, the ring and the cylindrical body are integrated via a weak piece. The fragile piece is similar to a gate of various resin molded products, has a bar shape with a narrowed cross-sectional area, and is assumed to be broken by a constant external force. In this invention, the cross-sectional shape and quantity are determined so that it may be easily broken by the external force at the time of removing a formwork.

  The invention described in claim 6 relates to the details of the ring, and is characterized in that a bar-like or strip-like buried piece projecting upward is provided on the upper surface of the ring. As described above, when the mold is removed, the ring needs to remain on the surface of the concrete, and it is preferable that the ring and the concrete be integrated so as not to be separated. Therefore, an embedded piece that protrudes in a rod shape or a belt shape from the upper surface of the ring may be provided. The buried piece is surrounded and constrained by concrete, and can hold the ring firmly. In addition, the upper surface of a ring means the other side of the surface which contacts a formwork. Moreover, upward is a direction which turns a back with respect to a formwork. In addition, the shape of the buried piece can be freely selected such as a shape that protrudes upward, a shape that protrudes obliquely upward, and a shape that bends in the horizontal direction in the middle.

  The invention according to claim 7 also relates to the details of the ring, wherein an outer cylinder projecting upward is provided on the outer periphery of the ring, and a collar-like buried ring is provided at the upper end of the outer cylinder. Features. The outer cylindrical body is a cylindrical or conical one that protrudes upward from the outer periphery of the ring, and is arranged so as to surround the cylindrical body. Furthermore, a collar-like buried ring is provided at the upper end of the outer cylinder. The brim shape means a disc shape protruding to the outer periphery of the outer cylinder. Therefore, the buried ring is located further outside the ring, but a step is generated by the height of the outer cylinder. Therefore, when the holder is fixed to the formwork, the ring contacts the formwork, but the buried ring is separated from the formwork by the height of the outer cylinder, and the concrete flows into both sides of the buried ring, making it stronger. Retained.

  As in the first aspect of the invention, the holder is composed of a cylindrical body and a central body, and the body portion of the insert fitting is pressed into and held in the cylindrical body, so that the shape of the holder is extremely high. This simplifies the manufacturing price and can meet the demand for cost reduction from construction companies. Moreover, the holder according to the present invention can be pulled out from the mold and reused easily, contributing to the reduction of construction costs and the reduction of waste. Furthermore, since the present invention completely covers the lower part of the insert metal fitting by the cylindrical body, the insert metal fitting can be held firmly and there is no problem in reliability.

  Since the head of the nail (fastener) is widely exposed when the holder is removed from the mold frame by providing a small diameter portion at the tip of the center body as in the invention described in claim 2, a tool such as a nail remover is used. Can be easily hooked. Therefore, workability at the time of removing the holder from the formwork is improved, and a reduction in cost due to a reduction in time can be expected.

  By providing an air vent hole at the bottom of the cylindrical body as in the third aspect of the invention, when inserting the insert fitting into the cylindrical body, an air escape path in the body is secured, and the internal pressure does not increase. Therefore, it is possible to avoid problems such as the insert fitting being pushed back, and the convenience is improved.

  As in the fourth aspect of the invention, the collar can be left in the vicinity of the surface of the solidified concrete by incorporating the collar into the holder and providing the cylindrical body with a protrusion having an appropriate size. And by changing the color of the color according to the purpose of the embedded insert fitting, the installer of wiring and piping can select the original insert fitting without hesitation, and the work progresses smoothly, making it convenient for construction. Can be expected to improve performance and reduce costs. Note that the collar has a simple shape and has little effect on cost.

  As in the fifth aspect of the present invention, when the holder is provided with a ring and the tubular body and the ring are integrated via the fragile piece, the ring is separated from the holder when the formwork is removed. And remains on the concrete surface. Therefore, by changing the color of the ring according to the use of the incorporated insert fitting, it is possible to obtain the same effect as the color shown in the invention of claim 4. In addition, in this invention, a ring can be integrally molded with a holder and handling at a distribution | circulation stage and a construction stage becomes easy.

  As in the sixth aspect of the invention, by providing the buried piece protruding from the ring, the entire circumference of the buried piece is surrounded and restrained by the concrete, and the ring and the concrete are firmly integrated. Therefore, the ring does not fall off from the concrete and contributes to the improvement of reliability. Further, as in the invention described in claim 7, the ring can be prevented from dropping off by providing an uneven ring on the outer periphery of the ring.

The shape example of the holder of the insert metal fitting by this invention is shown, (A) is the perspective view which arranged the component, (B) is sectional drawing of the state which assembled each component, (C) is insert It is sectional drawing after embedding a metal fitting in concrete. FIG. 2 shows the shape of a holder for an insert fitting different from FIG. 1, (A) is a perspective view in which constituent elements are arranged, (B) is a cross-sectional view in which the constituent elements are assembled, and (C) is an insert. It is sectional drawing after embedding a metal fitting in concrete. FIG. 1 shows a holder in which a collar is incorporated in the outer periphery of a cylindrical body by improving the holder shown in FIG. 1, (A) is a perspective view in which components are arranged, and (B) is an assembly of each component. It is sectional drawing of a state, (C) is sectional drawing after embedding insert metal fittings in concrete. FIG. 4 is a detailed cross-sectional view of the holder shown in FIG. 3. The holder which provided the ring in the outer periphery of the cylindrical body, and also provided the embedded piece on the upper surface of the ring is shown, (A) is the top view and perspective view of a holder, (B) is each component. It is sectional drawing of the assembled state, (C) is sectional drawing after embedding insert metal fittings in concrete, (D) is a perspective view of the holder which provided the strip | belt-shaped buried piece. The holder which provided the ring in the outer periphery of the cylindrical body, and also provided the buried ring in the outer periphery of the ring is shown, (A) is the top view and perspective view of a holder, (B) is each component. It is sectional drawing of the assembled state, (C) is sectional drawing after embedding insert metal fittings in concrete. It is the perspective view and sectional drawing which show the example of a shape and use example of a general insert metal fitting.

  FIG. 1 shows an example of the shape of the holder 11a of the insert fitting 21 according to the present invention. FIG. 1 (A) shows the arrangement of components, and FIG. 1 (B) shows the assembled components. FIG. 1C is a cross section after the insert fitting 21 is embedded in the concrete C. FIG. As shown in FIG. 1A, the insert fitting 21 has a flange 23 formed on the upper portion of the cylindrical body portion 22 and can transmit a load acting in the axial direction to the concrete C when embedded in the concrete C. Excellent pull-out strength. Further, an inlet hole 24 and a female screw 25 are formed in the body portion 22, and a bolt inserted from the lower end surface of the body portion 22 can be screwed together.

  The holder 11a is used to fix the insert fitting 21 to the mold P, and has a cylindrical shape as shown in FIG. 1A, one end surface of which is closed by the bottom portion 12, and a cylinder. A central body 15 disposed inside the cylindrical body 13 and protruding from the bottom 12 is integrally molded using a synthetic resin as a material, and the insert fitting 21 is inserted into the insertion groove 14 corresponding to the boundary between the cylindrical body 13 and the central body 15. The trunk 22 can be inserted. The inner diameter of the cylindrical body 13 is slightly smaller than the outer diameter of the body portion 22, and when the insert fitting 21 is inserted, the tubular body 13 is elastically deformed so that both are brought into close contact with each other. Can hold firmly. Furthermore, in order to improve the stability when the holder 11a is in close contact with the mold P, a brim-like skirt 36 may be provided at the bottom of the cylindrical body 13 as shown in this figure.

  The center body 15 is for inserting a fastener 19a for fixing the holder 11a to the mold P, and has a cylindrical appearance. However, in order to pass the fastener 19a, the vertical hole 16 penetrates in the axial direction. Yes. In order to improve the handleability of the holder 11a, the fastener 19a is preferably integrated with the center body 15, and the inner diameter of the vertical hole 16 is slightly smaller than the outer diameter of the fastener 19a. In use, the fastener 19a is not detached from the central body 15. Further, the central body 15 is not a simple columnar shape, and the tip portion thereof is a small diameter portion 17 whose cross section is reduced. In addition, the bottom portion 12 is not in contact with the formwork P in its entirety, but a relief portion 18 is provided in addition to the outer edge portion to suppress the contact area. On the surface of the mold P, fine irregularities are continuous, and the bottom 12 may become unstable. In this way, the relief portion 18 is provided to ensure stability.

  If the fastener 19a can fix the holder 11a to the mold P, its shape and the like can be determined freely. Since the formwork P of this figure assumes a wooden board, a simple flat-headed nail is used as the fastener 19a. In order to reuse the holder 11a driven into the mold P, it is necessary to pull out the flat-headed nail 19a from the mold P using a tool such as a nail extractor. In order to easily perform this operation, the tip of the central body 15 is a small-diameter portion 17 with a reduced cross-section, which inevitably increases the difference in diameter with the head of the flat-headed nail 19a, so It becomes easy. Note that when the entire cross section of the central body 15 is reduced, the strength also decreases. Therefore, it is preferable that only the distal end portion be the small diameter portion 17 as shown in this figure.

  After the flat head nail 19a is struck to the mold P and the holder 11a is fixed, when the insert fitting 21 is press-fitted into the cylindrical body 13, the state shown in FIG. The front end of the body portion 22 of the insert fitting 21 is in close contact with the bottom portion 12, and the cylindrical body 13 and the body portion 22 are also in close contact. However, a gap is secured between the central body 15 and the inlet hole 24. Thus, the center body 15 needs to have a size that can be accommodated in the insert fitting 21. At the stage of FIG. 1C where the concrete C has solidified, the insert fitting 21 is embedded in the concrete C, and the female screw 25 is exposed to the outside. Furthermore, the holder 11a is fixed to the mold P separated from the concrete C, but this can be easily pulled out using a nail punch or the like.

  FIG. 2 shows the shape of the holder 11b of the insert fitting 21 different from that in FIG. 1. FIG. 2 (A) shows the components arranged side by side. FIG. 2 (B) shows the assembled state of the components. 2C is a cross section after the insert fitting 21 is embedded in the concrete C. FIG. The mold P in this figure is a steel plate, and the flathead nail 19a shown in FIG. 1 cannot be used as the fastener 19, and a drill screw 19b is used as an alternative. The drill screw 19b has a feature that a steel plate can be drilled and a screw can be formed at the same time by using an electric screwdriver or the like. When the holder 11b is fixed to the formwork P of the steel plate as shown in FIG. Is suitable.

  When the drill screw 19b is used, an electric screwdriver or the like is also used when the holder 11b is removed from the mold P. Therefore, the small diameter portion 17 shown in FIG. 1 is unnecessary, and the length of the central body 15 is also reduced. In addition, the basic configuration such as holding the body portion 22 on the inner peripheral surface of the cylindrical body 13 is not different from that in FIG. 1, but the formwork P is a steel plate and has less surface irregularities. The escape portion 18 is not provided on the lower surface, and the entire surface is in contact with the mold P.

  FIG. 3 shows a holder 11c obtained by improving the holder 11a shown in FIG. 1 and incorporating a collar 32 on the outer peripheral surface of the cylindrical body 13, and FIG. FIG. 3B is a cross section in a state where the respective components are assembled, and FIG. 3C is a cross section after the insert fitting 21 is embedded in the concrete C. The collar 32 is manufactured separately from the holder 11c and integrally molded with various colored synthetic resins. The collar 32 is left inside the concrete C and is used for identifying the use of the insert fitting 21. Since the collar 32 is incorporated in the holder 11c, the skirt 36 (formed on the lower outer periphery of the holder 11a) shown in FIG. 1 is omitted.

  The cross section of the collar 32 has an “eight” shape spreading toward the end, and the upper neck portion 33 has no gap with the outer peripheral surface of the cylindrical body 13 and has an inner diameter that can freely slide. However, in order to prevent the collar 32 from falling off the cylindrical body 13 before the concrete C solidifies, the outer circumferential surface of the cylindrical body 13 is formed with a protruding ridge 30 projecting in an annular shape. ), The collar 32 is sandwiched between the ridge 30 and the mold P. Thereafter, when the concrete C is solidified and the formwork P is removed, the collar 32 adheres to the concrete C. Therefore, the ridge 30 is elastically deformed so as to be crushed and passes through the neck 33. To do. Therefore, the protruding line 30 suppresses the protruding amount.

  FIG. 4 shows a detailed cross-sectional shape of the holder 11c shown in FIG. The depth of the insertion groove 14 that receives the insert fitting 21 is closed by the bottom 12, but an air vent hole 35 that penetrates the front and back surfaces (the insertion groove 14 side and the relief portion 18 side) is provided at this location. Yes. The air vent hole 35 has a function for escaping the air in the body portion 22 to the outside when the insert fitting 21 is inserted. In this figure, only one portion having a small diameter is provided. When the insert fitting 21 is inserted into the holder 11c fixed to the mold P, the outer edge of the bottom 12 is in close contact with the mold P, and the air that has entered the escape portion 18 cannot be released to the outside. Therefore, only one tunnel-like notch 38 is provided on the outer edge of the bottom surface of the bottom 12 to ensure air permeability.

  FIG. 5 shows holders 11 d and 11 e in which a ring 42 is provided on the outer periphery of the cylindrical body 13 and an embedded piece 46 is provided on the upper surface of the ring 42. As shown in FIG. 5A, the ring 42 has a disk shape surrounding the lower portion of the cylindrical body 13, and consideration is given so that the bottom surface thereof can come into contact with the formwork P. Further, as shown in the plan view, the ring 42 is integrated with the cylindrical body 13 through a total of three weak pieces 43, and when an excessive external force is applied, the weak pieces 43 are broken, and the ring 42 is formed into a cylindrical body. Leave 13 Since the fragile pieces 43 are provided, three slits 44 are formed between the cylindrical body 13 and the ring 42. In addition, on the upper surface of the ring 42, there are provided four buried pieces 46 which are round bar-like and protrude upward.

  When the holder 11d is fixed to the mold P, the ring 42 contacts the mold P as shown in the cross-sectional view of FIG. The fragile piece 43 is provided slightly above the bottom of the cylindrical body 13 but on the upper side. Therefore, the outer peripheral side of the ring 42 contacts the mold P, but a certain amount of space is secured on the inner peripheral side. When the concrete C flows into the space from the slit 44, the ring 42 can be fixed so as to be sandwiched.

  When the concrete C is solidified and the formwork P is removed, the ring 42 is separated from the cylindrical body 13 as shown in FIG. Therefore, only the ring 42 remains on the surface of the concrete C, and the color can be easily recognized. The buried piece 46 is buried in the concrete C and prevents the ring 42 from falling off. The buried piece 46 may have a wide band shape, such as the holder 11e shown in FIG. 5D, in addition to the simple bar shape shown in FIG. Further, the buried piece 46 may be bent as shown in this figure.

  FIG. 6 shows a holder 11 f in which a ring 42 is provided on the outer periphery of the cylindrical body 13 and an embedded ring 48 is further provided on the outer periphery of the ring 42. The holder 11f is provided with a ring 42 as in FIG. 5, and further provided with an embedded ring 48 so that the ring 42 does not fall off from the concrete C. Both sides of the buried ring 48 need to be sandwiched between the concrete C, and an outer cylinder 47 is provided between the ring 42 and the buried ring 48 as shown in FIGS. 6 (A) and 6 (B). When the concrete C is solidified and the formwork P is removed, as shown in FIG. 6C, the brittle pieces 43 are broken and only the ring 42 is exposed on the surface of the concrete C, but the buried ring 48 is made of concrete. It is embedded in C and prevents the ring 42 from falling off.

11a, 11b, 11c, 11d, 11e, 11f Holder 12 Bottom 13 Tubular body 14 Insertion groove 15 Center body 16 Vertical hole 17 Small diameter part 18 Escape part 19a Fastener (flat head nail), 19b Fastener (drill screw)
21 Insert metal fitting 22 Body 23 Flange 24 Entrance hole 25 Female thread 30 Projection 32 Collar 33 Neck 35 Air vent hole 36 Bottom 38 Cutout 42 Ring 43 Fragile piece 44 Slit 46 Buried piece 47 Outer cylinder 48 Buried ring C Concrete P formwork

Claims (7)

Used to fix the insert fitting (21) to the formwork (P),
A bottomed tubular body (13) capable of fitting the body portion (22) of the insert metal fitting (21), and protrudes from the bottom portion (12) of the tubular body (13) and inside the body portion (22). An insert fitting holder characterized by comprising a central body (15) to be inserted, wherein a fastener (19) driven into the mold (P) passes through the central body (15).   The holder for an insert metal fitting according to claim 1, wherein a small-diameter portion (17) having a reduced cross section is provided at the tip of the central body (15).   The holder for an insert metal fitting according to claim 1 or 2, wherein an air vent hole (35) penetrating the front and back surfaces is provided in the bottom (12) of the cylindrical body (13). A collar (32) having a neck portion (33) that is slidable and slidable on the outer peripheral surface of the cylindrical body (13) is incorporated,
The outer circumferential surface of the cylindrical body (13) is provided with a ridge (30) for restricting movement of the neck (33) in the circumferential direction. The holder for the described insert fitting.   A disk-shaped ring (42) is provided on the outer periphery of the lower portion of the cylindrical body (13), and the ring (42) and the cylindrical body (13) are interposed via a plurality of fragile pieces (43) that can be broken by external force. The insert fitting holder according to claim 1, 2 or 3, wherein the holder is integrated.   The holder for an insert metal fitting according to claim 5, wherein a bar-like or strip-like buried piece (46) protruding upward is provided on an upper surface of the ring (42).   An outer cylinder (47) protruding upward is provided on the outer periphery of the ring (42), and a collar-like buried ring (48) is provided on the upper end of the outer cylinder (47). The holder for the insert fitting according to claim 5.

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