JP2001205609A - Insert retention tool and method for manufacturing molded body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insert retention tool enabled to be reused while an insert component can be easily retained with a form. SOLUTION: An insert retention tool for retaining an insert component 2 on an inner face side of a form 3 for molding a molded body 1 comprises a magnet 5 retained through a through hole 3K formed in the form 3 in a state wherein an attraction surface 5A becomes almost flush with an inner face 3C of the form 3, and an attraction component 6 which comprises a metallic material capable of being attracted to the attraction surface 5A of the magnet 5, and is freely detachably attached to the insert component 2 or is integrally molded with the insert component 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insert holder used for holding an insert member in a mold for forming a molded body such as a handhole, a manhole or an information box, and a molded article provided with the insert member. The present invention relates to a method for producing a molded body for producing a molded article.

[0002]

2. Description of the Related Art Conventionally, in order to hold an insert member on a mold, as shown in FIG. 8, bolts formed in an outer mold 3A located on the outside and an inner mold 3B located on the inside are inserted. The openings 3a and 3B of the molds 3A and 3B are formed by applying the ends of the nuts 2 as insert members to the holes from the inner side, and screwing the tips of the bolts 13 inserted from the outside into the bolt insertion holes to the nuts 2. After holding the nut 2, the (green) concrete or the like is poured into the molds 3A and 3B and solidified, and then the concrete molded body 1 formed by removing the bolts 13 and then solidifying is used as a crane or the like. As a result, the concrete molded body 1 can be detached from the molds 3A and 3B.

According to the above method, the nut 2 is attached to the inner frame 3B.
In order to hold the nut, one worker supports the nut 2 from the inside of the inner frame 3B, and in this state, another worker is formed by the inner frame 3B from the concave portion 14 formed on the floor surface. The bolts 13 must be screwed into the nuts 2 from the outside in an unstable posture, which is located in the narrow space 15 and bent down. In addition, since steam or the like is blown onto the mold to quickly solidify the concrete, the temperature inside the narrow space 15 is extremely high, and the inner mold 3B under such a condition is heated. The installation work of the nut 2 is difficult and the burden on the operator is large. Reference numeral 16 shown in FIG. 8 denotes a support base for placing and supporting the molds 3A and 3B. In addition, as shown in FIG.
It comprises a plurality of outer molds 3A, and
By making A swingably openable and closable around the horizontal axis cores X1 and X2 shown in the figure, the nut 2 can be easily attached to and detached from the outer mold 3A, but as described above, the nut 2 can be attached to the inner mold 3B. It was difficult to remove the nut 2. In order to solve the above problem, Japanese Patent Application Laid-Open No. Hei 7-232314 has been proposed. This constitutes an insert holder from a support provided with a sealing portion for closing the opening of the nut, and a protrusion protruding from the support and deformable in accordance with a hole formed in the formwork. The work can be performed by one worker from inside the formwork.

[0004]

The insert holder having the above structure must be mounted by forcibly pushing it into the hole of the formwork while deforming the projection, and requires an operation force. In particular, a large number of nuts are required. In the case of attaching the, it is burdensome for the worker. Incidentally, it is conceivable that the projection is made of a soft material that can be easily deformed so that the projection can be easily pushed into the hole. The projection could not be softened more than necessary. In addition, after the concrete is poured and solidified after mounting, the projections are separated from the support when the concrete body is lifted by a crane or the like to remove the formwork, so the separated projections are collected. This requires not only a recovery operation to perform the operation but also a re-use of the insert holder. or,
Because the surface of the support after the division is not flat,
Not only does it need to be sharpened with a file or the like so that a finger or the like does not get caught on the surface, and there is also room for improvement because fragments and the like may be scattered at the time of division.

The present invention has been made in view of the above circumstances and has an object to provide an insert holder which can easily hold an insert member on a mold and can be reused.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an insert holder for holding an insert member on an inner surface of a mold for forming a molded body such as a handhole or a manhole. A magnet which is supported by being penetrated in a through-hole formed in the mold in such a manner that an attraction surface is substantially flush with an inner surface of the mold, and a metal material which can be attracted to the attraction surface of the magnet. Also, an insert holder is constituted by a suction member detachably attached to the insert member or integrally formed with the insert member. Therefore, when the insert member is held by the mold, the suction member attached to the insert member or the suction member integrally formed with the insert member is substantially flush with the inner surface of the mold through the through hole formed in the mold. The magnets are attracted to the attracting surfaces of the magnets arranged so as to be flush with each other. Thereafter, the concrete is poured into the formwork, solidified, and the solidified concrete body is forcibly lifted against the attraction force of the magnet using, for example, a crane or the like, so that the concrete is separated from the formwork. It can be carried out. By removing the suction member from the separated molded body, the suction member can be used repeatedly. As the magnet, other than a permanent magnet,
An electromagnet may be used.

By supporting the magnet on a holder removably attached to the outer surface of the mold, the holder can be removed and the magnet can be replaced.

By setting the attraction area of the attraction member and the area of the attraction surface of the magnet to be substantially the same, both can be accurately positioned and the attraction member can easily move with respect to the magnet. Nothing.

The suction member includes a suction portion having a suction area larger than an outer dimension of the insert member, and a male screw portion screwed into a female screw formed on the insert member. By increasing the attraction force with the magnet by the attraction portion having an attraction area larger than the outer dimension of the insert member as described above, the concrete is reliably filled with the fluid pressure of the concrete poured into the mold and the mold. Therefore, it is possible to reliably prevent the suction member integrated with the insert member from being changed from the predetermined suction position due to vibrations or the like applied to the mold frame, and from separating the suction member from the suction surface of the magnet. Further, since the male screw portion is screwed into the female screw formed on the insert member, the connection between the suction member and the insert member can be made more difficult to be released than, for example, a plug-in type.

[0010] A method of manufacturing a molded body such as a handhole or a manhole by pouring concrete or the like into a space formed by a mold, wherein a magnet is inserted into a through hole formed in the mold. The suction surface of the magnet is penetrated and supported in a state of being substantially flush with the inner surface of the mold, and a metal suction member having substantially the same area as the suction area of the magnet is held by the insert member or integrated with the insert member. After the formed attracting member is attracted to the magnet, concrete or the like can be poured to form a molded body.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a handhole disposed between buried pipes for connecting, branching, passing through, and performing maintenance and inspection after burying optical fibers and cables inserted into the buried pipes. 3 shows a method of manufacturing a molded body 1 such as a manhole or a manhole, and shows a state in which a large number of nuts 2 made of metal (which may be made of resin and the material is not particularly limited) as an insert member are buried in the molded body 1. That is, after the nut 2 is held by the insert holder 4 on the inner surface side of the upwardly open metal mold 3 arranged on the floor surface, the (green) concrete is poured into the mold 3 and solidified. FIG. The mold 3 is a cylindrical outer mold 3 located on the outside.
A, and a convex inner mold frame 3B having a bottom portion in contact with the floor surface and located inside. The outer mold frame 3A is configured so that a plurality of (only two are shown in the figure) outer mold frames 3A can swing open and close around the horizontal axis cores X1 and X2 shown in FIG. Since the nut 2 can be easily attached to and detached from the outer mold frame 3A, the nut 2 may be mounted on the outer mold frame 3A using the insert holder 4 of the present invention, or by another method (the conventional method is also used). ) May be used to hold the nut 2. Further, the outer frame 3A may be formed of a fixed type that cannot swing and open. still,
The number of the nuts 2 is not limited to the number shown in FIG.

FIGS. 2A, 2B and 3 show the insert holder 4. FIG. This insert holder 4
The suction surface 5A is inserted into the circular through-hole 3K formed in the mold 3.
And a circular magnet 5 penetrated and supported in a state flush with the inner surface 3C of the mold 3 and a metal detachable from the nut 2 and having the same area as the attracting surface 5A of the magnet 5. And the suction member 6. The shape of the magnet 5 may be any shape such as a square, a rectangle, or an ellipse other than a circle. Further, by making the attraction surface 5A of the magnet 5 flush with the inner surface 3C of the mold 3, there is an advantage that the molded body 1 can be smoothly separated from the mold 3.
The suction surface 5A may slightly deviate from the inner surface 3C of the mold 3. Further, by setting the suction area of the suction member 6 to be the same as the suction area 5A of the magnet 5,
Although there is an advantage that the positioning of the attraction member 6 with respect to the magnet 5 can be accurately performed, the attraction area of the attraction member 6 may be set to be substantially the same as the attraction surface 5A of the magnet 5. Here, a permanent magnet that is advantageous in terms of cost is used as the magnet 5, but an electromagnet may be used. In the case where the electromagnet is used, when the molded body 1 is separated from the mold frame 3, if a magnetic force is not generated, the resistance at the time of separation can be reduced. Preferably, the magnetic force of the magnet 5 acts only on the attracting surface of the attracting member 6 and does not act on the form 3, that is, the outer diameter direction of the magnet 5.

After the magnet 5 is inserted into the holder 7 whose one side is open, the bolt 8 inserted from the through hole formed in the back (rear) surface of the holder 7 is attached to the back (rear) surface of the magnet 5. The screw can be fixed to the holder 7 by being screwed into the female screw portion formed in the holder 7. Each of the bolts 9, 9 inserted from the through holes formed in the flange portions 7A, 7A integrally formed on the outer peripheral surface of the holder 7 is connected to a nut 10, 10 fixed to the formwork 3 by welding or the like. By screwing, the holder 7 can be fixed to the mold 3. 11 is a packing for sealing between the holder 7 and the mold 3. The holder 7 can be firmly fixed to the mold frame 3 by bolts 9, 9. For example, a locking hole is formed in the mold frame 3, and a locking portion locked and locked in the locking hole is formed. The holder 5 may be provided in a holder, or the holder may be formed of a permanent magnet that can be attracted to the magnet 5 and the mold 3, thereby eliminating the operation of fixing the magnet 5 to the holder with bolts 8. Therefore, there is an advantage that the attachment and replacement work of the magnet 5 can be performed quickly.

As shown in FIGS. 2A, 2B and 3, the suction member 6 has a suction portion 6A having a suction area larger than an outer dimension of the nut 2, that is, an outer diameter.
And a male screw portion 6B screwed into the female screw portion 2A of the nut 2. A groove 6M is formed on the surface of the suction portion 6A so that the tip of a flathead screwdriver or the like can be locked to rotate the suction portion 6A, so that the nut 2 and the suction member 6 can be quickly attached and detached. I can do it. 2 (a) and 12 shown in FIG. 3 indicate that concrete poured into the female screw portion of the nut 2 from between the opening end surface 2D of the nut 2 and the back surface 6D of the suction portion 6A opposed thereto. This is a packing for sealing so that it is not necessary. The suction force can be increased by making the suction portion 6A of the suction member 6 a suction area larger than the outer diameter of the nut 2, but depending on the weight of the nut 2 or the like, as shown in FIG. The outer diameter of the nut 2 may be substantially the same as the outer diameter. The other configurations shown in FIG. 5 are the same as those in FIG. 3, and therefore are denoted by the same reference numerals and description thereof is omitted.

Using the insert holder 4, the nut 2
In order to hold the suction member 6 in the mold 3, first, as shown in FIG. 2A, the suction member 6 is screwed into the nut 2 to integrate the suction member 6 and the nut 2. In this state, the attraction portion 6 of the attraction member 6 is attached to the attraction surface 5A of the magnet 5 fixed to the mold 3.
A is adsorbed (see FIG. 3).

After the nut 2 is attracted and held to the mold 3 by magnetic force via the insert holder 4 as described above, (green) concrete is poured from above the mold 3 and solidified ( Steam or the like may be sprayed on the mold 3 to accelerate the solidification.) The molded body 1 is obtained. Next, FIG.
In order to move the molded body 1 along the contact surface with the formwork 3 as shown in FIG. 1, the nut 2 is moved up by a crane (not shown), etc.
Is moved in a direction perpendicular to the suction surface 5A to release the molded body 1 from the mold frame 3 to obtain the molded body 1 provided with the nut 2 as shown in FIG. After the formed body 1 thus formed is installed, when a bolt (not shown) is screwed into the nut 2 in order to install a cable rack or the like in the formed body 1, the groove 6 </ b> M of the suction member 6 is used as described above. It can be easily removed by inserting the tip of a tool such as a flathead screwdriver and rotating it. Since the suction member 6 is made of metal, it is difficult for the suction member 6 to adhere to the poured concrete, and the suction member 6 can be easily rotated. The molded body 1
, The molded body 1 is detached from the mold frame 3. On the contrary, the molded body 1 is held at that position, and for example, the mold frame 3 placed on an elevator is lowered to form The form 3 may be detached from the body 1,
The mold frame 3 and the molded body 1 may be moved away from each other in the up-down direction to separate them.

The nut 2 and the suction member 6 may be configured as shown in FIG. That is, the female screw portion 2A formed on the nut 2 is configured as a two-stage screw of a large-diameter female screw portion 2B located on the opening side and a small-diameter female screw portion 2C located on the back side, and the suction portion 6A of the suction member 6 is formed. An opening is formed at the center, and the inner surface 6b of the male screw portion 6B and the inner peripheral surface 6a of the suction portion 6A are formed.
Are configured to be flush with each other. Therefore, in a state where the suction member 6 is screwed into the nut 2, the inner surface of the suction member 6, that is, the inner surface 6b of the male screw portion 6B and the suction portion 6A
The inner peripheral surface 6a of the nut 2 can be set to be larger in diameter than the valley of the small-diameter female screw portion 2C, so that the small-diameter female screw portion 2C of the nut 2 can be bolted (not shown) without removing the suction member 6. Can be screwed in. Incidentally, the inner surfaces 6a and 6b of the suction member 6 may be set to have the same diameter as the valley of the small-diameter female screw portion 2C.

The nut 2 and the suction member 6 are connected to each other as shown in FIG.
As shown in FIG. By integrally forming in this manner, it is possible to reduce the cost by reducing the number of parts, to eliminate the work of screwing and integrating the two as described above, and to remove the suction member 6 as described above. Can be eliminated.

[0019]

According to the first or fifth aspect of the present invention, the suction member attached to the insert member or the suction member integrally formed with the insert member can be substantially removed from the inner surface of the mold frame through the through hole formed in the mold frame. The insert member can be held on the mold simply by attracting it to the attracting surface of the magnets arranged so as to be flush with each other, so that even one worker can easily insert the insert into the mold. Can be held. In addition, for example, by using a crane or the like to forcibly raise the magnet against the attraction force of the magnet, the mold is separated from the mold, and the suction member is repeatedly used by removing the suction member from the separated molded body. be able to. By providing a locking portion that can be locked and unlocked on the locked portion formed on the mold frame on the insert holder, and furthermore, a finger or the like is provided on the separated surface in the case of the conventional method by division. There is no need to sharpen the outer surface with a file or the like so as not to be caught, and no fragments or the like are scattered at the time of division.

According to the second and sixth aspects of the present invention, the magnet is supported by the holder detachably mounted on the outer surface of the mold, so that the magnet whose magnetic force is reduced by replacing the holder can be easily and quickly replaced with a new magnet. This is advantageous in terms of maintenance.

According to the third aspect of the present invention, by setting the attraction area of the attraction member and the area of the attraction surface of the magnet to be substantially the same, both can be accurately positioned and the attraction to the magnet can be performed. Since the members do not easily move, a highly reliable insert holder can be configured.

According to the fourth and seventh aspects, the adsorbing portion having an adsorbing area larger than the outer dimension of the insert member enhances the adsorbing force with the magnet, so that the fluid pressure of the concrete poured into the mold can be reduced. To ensure that concrete is filled in the formwork, the suction member integrated with the insert member is changed from a predetermined suction position due to vibration applied to the formwork, or the suction member is separated from the magnet suction surface. It can be reliably prevented. Further, since the male screw portion is screwed into the female screw formed on the insert member, the connection between the suction member and the insert member can be made more difficult to be released than, for example, a plug-in type. Therefore, there is no occurrence of defective products such as a shift of the position of the insert member from a predetermined position, which can be advantageous in terms of manufacturing cost.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state in which an insert member is embedded in a molded body.

FIG. 2A is an explanatory view showing a state immediately before a suction member is screwed into a nut, and FIG. 2B is a front view of the suction member.

FIG. 3 is a cross-sectional view showing a state in which concrete has been poured into a mold after fixing a nut to a mold frame by the suction force of an insert holder.

FIG. 4 (a) is a cross-sectional view showing a state in which the molded body is slightly lifted in order to release the molded body from the mold, and FIG. 4 (b) is a view showing a state in which the molded body is lifted up and separated from the mold. It is sectional drawing.

FIG. 5 is a cross-sectional view showing a case in which another suction member having a different size of the suction portion is used, and a state in which concrete is poured into the mold after the nut is fixed to the formwork by the suction force of the insert holder.

FIG. 6 is a cross-sectional view showing a state where the suction member is screwed into another nut.

FIG. 7 is a cross-sectional view showing a case where a nut and a suction member are integrally formed.

FIG. 8 is a cross-sectional view showing a conventional example in a state where an insert member is embedded in a molded body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Molded body 2 Nut (insert member) 2A female screw part 2B Large diameter female screw part 2C Small diameter female screw part 2D end surface 3 Formwork 3A Outer formwork 3B Inner formwork 3C Inner surface 3K Through hole 4 Insert holder 5 Magnet 5A Adsorption surface 6 Adsorption Member 6A Suction part 6B Male thread part 6a Inner peripheral surface 6D Back surface 6M groove 7 Holder 7A Flange part 8,9 Bolt 10 Nut 11,12 Packing 13 Bolt 14 Depression 15 Space 16 Support base S Gap

Claims (7)

[Claims] 1. An insert holder for holding an insert member on an inner surface side of a mold for forming a molded body such as a handhole or a manhole, wherein a suction surface is formed in a through hole formed in the mold. A magnet penetrated and supported so as to be substantially flush with the inner surface of the formwork, and a metal material which can be attracted to the attracting surface of the magnet, and which is detachably attached to the insert member or the insert member An insert holder comprising a suction member integrally formed with the insert. 2. The insert holder according to claim 1, wherein the magnet is supported by a holder detachably attached to an outer surface of the mold. 3. The insert holder according to claim 1, wherein a suction area of the suction member and an area of a suction surface of the magnet are set to be substantially the same. 4. The insert holding device according to claim 1, wherein said suction member comprises a suction portion having a suction area larger than an outer dimension of said insert member, and a male screw portion screwed into a female screw formed on said insert member. Utensils. 5. A method for manufacturing a molded body, wherein a molded body such as a handhole or a manhole is formed by pouring concrete or the like into a space formed by a mold, wherein a magnet is formed in a through hole formed in the mold. The suction surface of the magnet is substantially flush with the inner surface of the mold, and the metal suction member having an area substantially equal to the suction area of the magnet is held by the insert member. A method for manufacturing a molded article, comprising: adsorbing the attracting member integrally formed on the magnet to the magnet; and pouring concrete or the like to form a molded article. 6. The method according to claim 5, wherein the magnet is supported by a holder detachably attached to an outer surface of the mold. 7. The molded article according to claim 5, wherein said suction member comprises a suction portion having a suction area larger than an outer dimension of said insert member, and a male screw portion screwed into a female screw formed on said insert member. Manufacturing method.