JPH07232314A - Insert holder, production of concrete product, and durable form - Google Patents

Abstract

PURPOSE:To simply set an insert in a durable form and to prevent an insert from obstructing a removal operation even if it is set to an inner form to conduct the removal operation similarly to that of a concrete product without an embedded insert. CONSTITUTION:An insert holder 10 comprises a plug part 11 mounted on an open side of an insert and a projection part 20 projected from a setting surface 12 of the plug part 11. The plug part 11 can be molded in a hollow form opened on the opposite side to the projection part 20. The diameter of the projection part 20 extending from the setting surface 12 can be made small. An insert can be set by inserting the projection part 20 to a setting hole previously prepared in a form. The diameter of the setting hole can be made small. An operation part 30 for removing the plug part 11 is provided on the setting surface 12. After the product is removed from the form, the plug part 11 can be removed by the operation part 30 exposed on the surface of the concrete.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insert holder for holding an insert embedded in a concrete product and setting it in a mold, a method for manufacturing a concrete product using the insert holder, and an insert holder. It relates to a durable formwork suitable for setting.

[0002]

2. Description of the Related Art In recent years, in secondary concrete products manufactured by using a durable mold, a large number of hollow inserts having internal threads or the like are buried therein. In the handhole used when burying electric wires in the ground, or in the common groove where gas, water, etc. can be installed side by side, a large amount of inserts should be installed in predetermined places to facilitate installation of cable racks and pipe racks. Often buried in advance.

FIG. 42 illustrates a method conventionally used for setting an insert in a mold.
As shown in an enlarged view in FIG. 43, the insert bolt 6 is formed by inserting a setting bolt 5 or 8 from the opposite side of the outer mold 1 and the inner mold 3 and using a female screw formed inside the insert 6. A method of setting the frame 1 and the frame 3 at predetermined positions is a general method.

According to this method, a hole larger than the inner diameter of the insert for allowing the setting bolts 5 or 8 to pass is formed at the place where the opening of the insert 6 of the molds 1 and 3 is located or on the opposite side. Need to be kept. Further, when setting the insert 6, it is necessary to operate the setting bolts 5 or 8 from the surface of the form 1 or 3 opposite to the surface on which the insert 6 is set. For this reason, a plurality of workers are required to set the insert 6 except for a mold having a very small size. Further, concrete cannot be removed unless the setting bolts 5 or 8 are removed after the concrete product 2 is molded by injecting concrete between the outer mold 1 and the inner mold 3.

When the inner surface of the concrete product 2 shown in FIG. 42 is to be buried in the inner surface of the concrete product 2 shown in FIG. I have to. Since the operator cannot get access to this inner formwork, it is necessary to lift the formwork together with the concrete product, or to invert them so that the worker enters the inner formwork 3. In order to invert or jack up concrete secondary products together with the formwork, the weight of these concrete secondary products is 2-3.
Since there are tons or more, large equipment is required. In addition, since the process of lifting such a heavy object with a crane and having a worker inside or reversing the heavy object involves danger, many workers are required for monitoring and the like, and the load on the worker is high.

Further, in a durable mold for mass-producing concrete products, it is important to secure the dimensional accuracy of the mold so that the accuracy of the concrete product after molding can be maintained, and the mold can be removed smoothly. It is also important for A mold such as the inner mold 3 that is demolded by sliding the inner surface of the concrete product cannot be demolded unless it is manufactured with high precision and distortion or unevenness is prevented during use. If a large hole is opened in the mold for setting the insert, distortion or unevenness is likely to occur, so a skilled worker is required. When changing the mounting position of the insert, etc., it is necessary to close the hole opened in the formwork by welding etc., but it is difficult to perform repair work so that distortion etc. does not occur, and if repair is not possible, , It is also necessary to install a new form every time the embedding position of the insert changes.

On the other hand, if a bolt for fixing the insert from the outer mold 1 side to the inner mold 3 is used like the setting bolt 8, the step of removing the bolt from the inner mold 3 can be avoided. . However, it takes a lot of time to set the insert by using the bolt 8, and skill is required to obtain the accuracy of the embedding position. Also, after removing the bolt 8,
It is necessary to fill with mortar, and at this time, there is a problem that a route for water permeation easily occurs in the concrete product.
Further, in the case where the inner form frame having a slight taper shape is adopted in consideration of demolding, it is necessary to prepare a plurality of setting bolts 8 depending on the position where the insert is installed.

As shown in FIG. 44, there is a method of setting the insert 6 by using a substantially cylindrical boss 4 instead of the setting bolt 5 or 8. FIG. 45 is an enlarged view of the hollow plug 7 to be mounted on the boss 4. In this method, the main body 7
By inserting a into the opening of the insert and inserting the plug 7 into the boss 4, the insert 6 is mounted at a predetermined position where the boss 4 is attached. Since the plug 7 set in this way is removed from the boss 7 while being attached to the insert 6 when the mold is removed, the above-mentioned setting bolt is unnecessary. When using the insert 6, a jig such as a screwdriver is inserted into the groove 9 provided in the bottom of the plug 7 and the plug 7 is removed from the insert 6.
Therefore, the plug 7 can be attached to the boss 4, and the inner side 7 whose side facing the mold is open so that the driver can reach the groove 9.
It has a hollow main body 7a of d, a male screw portion 7b corresponding to the female screw of the insert 6, and a protruding portion 7c for forming the groove 9.

With the method of setting the insert 6 in the mold using the boss 4 and the plug 7 as described above, the time and effort required for demolding can be omitted and the work can be reduced. This method has no problem when the insert is set in a formwork that is removed perpendicularly to the surface of the concrete product, such as a base. However, the boss 4 is used in the mold that is swung and removed like the outer mold 1.
And the concrete product 2 interfere with each other and the mold cannot be removed, and the concrete product is chipped. Further, when the mold is removed by sliding like the inner mold 3, the boss interferes with the concrete product, so that the insert cannot be attached.

[0010]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an insert holder which can solve various problems which have been problems in the conventional setting method as described above. In common grooves and handholes, there are an increasing number of cases where inserts are embedded inside the common groove to reduce work on site and improve work efficiency, and concrete products that can meet these requirements. It is also an object of the present invention to provide a method for producing

It is a further object of the present invention to provide a durable mold suitable for setting the insert holder of the present invention.

That is, it is an object of the present invention to provide an insert holder that can be easily set on a mold by one worker without using a setting bolt. In addition, when removing from the mold, no extra step is required to remove the setting bolts, so that you can remove the mold by sliding it like an inner mold, or by turning the mold to remove it. It is intended to provide an insert holder that can be used. Another object of the present invention is to provide an insert holder that can reduce the diameter of a hole for setting an insert provided in a mold, prevent deterioration of the mold, and easily change the position of the insert. In addition, the insert holder protects the opening of the insert until just before use, and the insert is clogged with dust after being embedded,
It is also an object to provide an insert holder that can prevent rust due to rainwater or the like. Further, it is an object of the present invention to provide an inexpensive insert holder that has such many advantages.

Conventionally, in the process of manufacturing a concrete product with embedded inserts, there are more steps than in the case of manufacturing a concrete product without embedded inserts,
It takes time and labor for workers. Therefore, an object of the present invention is to provide a manufacturing method capable of providing a concrete product in which an insert is buried more simply, in a short period of time, and with the labor of the worker as little as possible. Another object of the present invention is to provide a manufacturing method capable of reducing the manufacturing cost of the concrete product and shortening the delivery time by manufacturing the concrete product using the insert holder which is inexpensive and hassle-free.

[0014]

An insert holder according to the present invention is for mounting a hollow insert at least one end of which is open and has a plug portion which is insertable into the opening of the insert. The side of the plug portion facing the mold is a substantially flat setting surface. Furthermore, at least one protrusion is projected from this setting surface, and by mounting this protrusion in a setting hole provided in the mold, the insert is set, that is, the insert can be mounted at a predetermined position of the mold. I have to.

If the protrusion can be attached to the setting hole by, for example, pushing, fitting, tapping, or screwing in, it is easy to set the insert holder on the mold, and the mounting bolt is attached from the outside of the mold. There is no need to pass it through, and even one worker can easily set the insert in the formwork. If this projection can be cut by the force that acts during demolding, or if it is configured to come off from the setting hole, it can be set to any formwork that moves during demolding, such as the inner and outer molds, The work during demolding can be greatly saved.

Further, it is desirable that a substantially flat setting surface is provided on the side of the plug portion facing the mold, and the protrusion is projected from this setting surface. When molding the insert holder according to the present invention using a resin containing a plastic material such as an ordinary plastic such as polypropylene or vinyl chloride, or a so-called engineering plastic such as reinforced polyethylene, a protrusion protruding toward the opposite side to the setting surface. This is because the plug portion can be molded using the respective molding dies from each side with the setting surface sandwiched therebetween. Therefore, the diameter and shape of the plug portion and the diameter and shape of the protruding portion can be designed to be suitable for their respective functions. Therefore, it is possible to adopt a configuration in which the diameter of the protrusion can be reduced or the protrusion can be cut by the force acting at the time of demolding. Even if the protrusion having such a shape is adopted, the plug can have a shape suitable for the function suitable for the plug, that is, the sealing property and the ease of removal. When molding the plug part with resin, it is possible to adopt a design in which the molding formwork is pulled out on the side opposite to the protruding part with respect to the setting surface. It becomes a partly open shape. A molding die for such an insert holder is simplified, and various functions can be easily realized.

Further, if an operating portion that can be operated by a jig when removing the plug portion is provided on the setting surface, the operating portion is exposed on the surface after the concrete product is molded, so that the plug portion can be removed. Easy to do. Also, if the projection is cut off from the plug when removing from the mold, the projection does not get in the way when operating the operating section, so the operating section and the projecting section can be designed individually and is suitable for each function. Different configurations can be adopted.

Further, if the setting surface is in close contact with the surface of the mold, it is possible to prevent the scale of the concrete from entering between the setting hole and the projecting portion. As a result, the setting hole is not blocked by the glue, and it becomes easy to remove the protrusion remaining in the divided setting hole, as will be described later. Further, it is possible to prevent the intrusion of the concrete ladle into the operation portion provided on the setting surface. A seal that can be deformed according to the surface of the mold such as a sponge may be provided around the setting portion to more reliably prevent the intrusion of the ladle.

In the insert holder of the present invention, it is easy to make the outer diameter of the protruding portion smaller than the outer diameter of the plug portion as described above, and thereby the diameter of the setting hole prepared in the mold can also be made smaller. . Therefore, it is easy to prevent distortion of the mold, ensure dimensional accuracy of the mold, and easily open the setting hole. Furthermore, if the diameter of the setting hole is small, it is not necessary to close the setting hole even when changing the setting position of the insert. As in the past, if the inner diameter of the setting hole is about the inner diameter of the insert, concrete will flow out from the setting hole, so it is necessary to close the unused setting hole by welding etc., so that the formwork will not be distorted Required skill. However, if the setting hole is made small and the diameter is about 5 mm, it is not necessary to close the setting hole that is not used, because the setting hole is closed by the cement. Considering this point and the strength of the protrusion, the outer diameter of the protrusion is preferably about 2 to 10 mm, more preferably about 3 to 8 mm. Even if the outer diameter of the setting hole is about 10 mm, the setting hole can be easily closed with tape or the like.

If the connecting portion between the protrusion and the plug portion is divided by the force exerted when the mold is released from the mold, the embedding of the insert does not hinder the demolding work. The demolding work can be performed in the same process as the concrete products that are not made. Even if the insert is set in a place where the operator cannot reach it, such as the inner mold, it is not necessary for the worker to enter the inside of the mold because the protruding portion itself comes off when the mold is removed.

Therefore, the demolding process can be simplified and the labor of the worker can be reduced. Further, in the case of the mold which is swiveled and removed, the protrusions are divided by the force when the mold is removed or come off from the mold, so that the insert can be installed regardless of the turning radius of the mold. Therefore, the insert can be embedded in any place without troubles such as a chipped chip or defective mold release.

In order to make it easier to cut the connecting portion, it is desirable that the diameter of the protrusion can be made small. In the insert holder of the present invention, the plug portion and the protrusion are separated by the setting surface. Can be made small regardless of the diameter of the plug part. It is also possible to make the protrusion hollow so that it can be easily cut. Even in this case, if the diameter of the protruding portion is large, the protruding portion may be distorted due to the force exerted at the time of demolding, and it may be difficult to disconnect the connecting portion. Therefore, the smaller diameter of the protruding portion is desirable.

Further, in order to easily cut the connecting portion, it is also effective to make the sectional area of the connecting portion smaller than the sectional area of the protrusion. For example, the vicinity of the connecting portion may be widened toward the tip of the protrusion, or the connecting portion may be provided with a recess or a cut along the direction in which the protrusion extends or at a right angle to the direction in which the protrusion extends. it can. Also, in the connection part,
You may provide the hole of at least 1 line | wire which penetrates substantially perpendicular to the direction which the protrusion part extended.

Further, at least one streak groove connected to the hole formed in the connecting portion may be formed on the setting surface, and the groove may be operated by a jig when the plug portion is removed.

As a protrusion that can be mounted in the setting hole, there is one having a column portion that fits into the setting hole. It is desirable that the relationship between the column portion and the setting hole be in a so-called interference fit or interference fit state. Further, considering the influence on the setting holes, it is desirable to use a material that is softer than the material of the mold for the pillar portion. Since a metal such as an iron plate is often used as a durable mold, the pillar is made of a resin such as plastic.

Further, the projecting portion may be provided with a column portion whose cross section is substantially elastically deformed in accordance with the setting hole. For example, a shape provided with a plurality of ribs extending in the radial direction of the pillar portion, a crescent shape, a half moon shape, a star shape, a polygonal shape, or the like that makes contact with the inner surface of the setting hole at at least two points can be adopted. With such a shape, when inserted into the setting hole, the cross section deforms according to the setting hole and presses the inner surface of the setting hole, so the plug part is molded by the elastic force of the pillar portion and the frictional force with the setting hole. Can be attached to the frame. The pillar part with such a shape is
The shape does not need to be completely elastically restored when taken out from the setting hole, and it may include plastic deformation, and the insert can be set in the form via the plug part without affecting the shape of the setting hole. Any material can be used as long as it can obtain adhesive strength. It may be a column portion having a cross-sectional shape in which irregularities are periodically repeated or a shape in which irregularities are periodically repeated in the longitudinal direction of the protrusion.

If the protrusion having such a column portion that can be substantially elastically deformed has a length that penetrates the mold, the portion that penetrates the mold tends to return to the original form. As a result, even stronger adhesion can be obtained.

Further, even in the case of a protrusion having a penetrating portion that spreads after penetrating the mold, the plug can be set in the mold through the setting hole. Also included are those that press the setting hole with the penetrating portion, and those that can obtain adhesive force by pressing the surface of the formwork opposite to the surface on which the insert is set after the penetrating portion penetrates. As such a penetrating portion, there are one having a substantially arrowhead shape and one having a portion that widens toward the tip of the penetrating portion.

The protrusions that have been separated from the plug portion and left in the setting holes when the mold is removed can be easily removed from the setting holes. For example, if a protrusion is provided with a portion that widens toward the tip, it will be easier to move to the opposite side of the form when the protrusion is cut,
It is easy to remove the remaining protrusions.

If a protrusion having a shape such that a gap is formed between the rib and the setting hole when inserted into the setting hole,
It is possible to easily rotate and remove the protruding portion that has been cut using this gap and remains in the installation hole of the mold.

The number of protrusions is not limited to one, and it is possible to provide a plurality of protrusions and obtain the adhesive force necessary for securely setting the insert in the mold. When a plurality of protrusions are provided, these protrusions may be arranged so that the side surfaces of the setting hole can be pressed against each other. Further, these protrusions may be provided with a portion that penetrates the setting hole and extends to the opposite side along the back surface of the mold. The plurality of protrusions may be arranged so as to be inserted into the plurality of setting holes, respectively, or the plurality of protrusions may be arranged so as to be inserted into one setting hole.

Furthermore, since the projection provided on the insert holder according to the present invention is to be installed in the setting hole which is opened in advance in the mold, the tip thereof does not need to have an acute angle and has a non-spiral shape. It just needs to be narrowed smoothly. For example, a substantially semicircular or substantially hemispherical tip may be used. Since the tip is not at an acute angle, it does not damage the worker himself or work clothes during the work, and can also prevent damage to the formwork. Also,
If the tip is thin, it is easy to guide the protrusion to the setting hole.

Further, the protrusion may be provided with a column portion which can be screwed into an internal thread formed in at least a part of the setting hole. A male screw may be pre-formed on this column part, or the column part may be made of a material that is softer than the material of the setting hole, such as resin, and when the column part is screwed into the setting hole, the male screw will be cut into the column part. It may be something that can be.

In the present invention, since the protrusion extends from the setting surface, even if the protrusion is of a screw type, the shape of the protrusion does not depend on the plug portion and has a small diameter or a small diameter. The structure can be freely adopted, such as making it easier to cut. For example, in addition to the column, the column portion may be provided with a plurality of ribs extending in the radial direction of the column portion.

The operation portion can be constructed by retracting a part of the setting surface. As such an operation part, there are one in which a part of the setting surface retreats in a step shape, and one in which a part of the setting surface is recessed. As a part of the setting surface is dented, there is a groove shape that makes it easy to insert a jig such as a driver, or one that has multiple dents and allows you to insert a jig for removal. .

The insert holder according to the present invention is suitable for molding with a resin such as plastic as described above, and has a female screw formed inside the insert on the outer peripheral surface of the plug portion. Corresponding male threads can be preformed. Alternatively, the outer peripheral surface may be made of resin, and when it is screwed into the insert, the male screw may be cut by the female screw of the insert. The plug part can be inserted in close contact with the opening of the insert,
It is possible to prevent the ladle of concrete from entering during manufacturing, and prevent dust, water, etc. from entering into the inside of the insert after manufacturing. Further, if the insert is made of resin, or apart from the insert holder according to the present invention, the opening of the insert is protected, and if an insert holder made of resin embedded along with the insert is provided, A male screw may be formed on the outer peripheral surface of the plug portion and a part of this male screw may be cut. By inserting such a plug part, the female screw can be cut in the insert holder attached to the insert to bring the plug part into close contact.

When the plug part is made of resin, the plug part may be broken and discharged to the outside by using a hammer or the like when using the insert in the field without forming the operation part on the setting surface. It is also easy to get the insert ready for use by breaking the male screw and pushing it inside the insert.

When a concrete product is manufactured using the insert holder according to the present invention, a protrusion is inserted into a small-diameter setting hole that has been opened in advance at a predetermined position of the form, and the insert is inserted through the insert holder. Can be set at a predetermined position of the formwork, and concrete can be poured into the formwork. Further, a manufacturing method characterized in that the projecting portion is cut from the plug portion by the force exerted at the time of demolding and the concrete product is demolded from the mold can also be adopted.
Further, after the concrete product is demolded, it is possible to remove the plug portion from the insert embedded in the concrete product by using the operating portion exposed on the surface of the concrete product.

Further, by adopting the insert holder according to the present invention, at least one setting hole capable of inserting the protrusion with an inner diameter smaller than the inner diameter of the insert is provided at a predetermined place for setting the insert. A durable formwork can be used. Therefore, it is possible to manufacture a concrete product in which the insert is embedded by using a mold with high accuracy and less distortion.

[0040]

Embodiments of the present invention will be described below with reference to the drawings.

[Embodiment 1] FIG. 1 shows an outline of an insert holder according to Embodiment 1 of the present invention. Also, FIG.
The insert holder 10 of the present example is used to insert 6
Is set in the mold 40. The insert holder 10 of this example includes a plug portion 11 mounted in the opening 6a of the insert 6 having a hollow interior, and the plug portion 1
1 and a protrusion 20 protruding toward the mold 40. A substantially flat setting surface 12 is formed on the side of the plug portion 11 facing the mold 40, and the protruding portion 20 projects from substantially the center of the setting surface 12. A pair of recesses 30 are formed on the setting surface 12 with the projecting portion 20 interposed therebetween, and a jig can be inserted into these recesses 30 to remove the plug portion 11 from the insert, as described later. Has become.

The plug portion 11 is cylindrical and has a sealing portion 14 on the outer peripheral surface 13 of which an external thread is formed, and a flange portion which is flared in the outer peripheral direction on the side of the mold 40 of the sealing portion 14. 15 is provided, and the side of the flange portion 15 facing the mold 40 is the setting surface 12. The outer peripheral surface 16 of the flange portion 15 is narrowed at the tip of the plug portion 11, that is, toward the sealing portion 14, so that it does not interfere with concrete when the plug portion is removed from the insert 6 embedded in concrete. It has become.

The protrusion 20 is formed by four ribs 22 extending from the central axis 21 in the radial direction, respectively, and these form a protrusion having an outer diameter of about 5 mm and protruding from the setting surface 12 by about 12 mm. Has been done. Each rib 22 has a connecting portion 25 connected to the setting surface 12.
Is gradually narrowed from the end to the tip 23, and the tip 23 is processed into a rounded shape,
The tip of the protrusion 20 is designed so as not to form an acute angle.
In the vicinity of the connecting portion 25, the width of the rib 22 is slightly widened toward the tip 23, and the portion near the setting surface 12 is weak in strength.

A portion 24 extending from the connecting portion 25 to the tip 23 by approximately the thickness of the mold 40, for example, 3.2 mm.
The width a is wide so that the back surface of the mold 40 can be pressed when the protrusion 20 is inserted into the mold 40.
Further, the protrusions 20 of the present example have molds 4 having different thicknesses, for example, a portion 24b corresponding to a mold having a thickness of 4.5 mm.
The width of the rib 22 is narrowed once from the location 24a corresponding to the mold to the tip 23 so that the back surface of 0 can be pressed.

With reference to FIGS. 2 to 4, description will be made on how a concrete product is manufactured using the insert holder 10 of this embodiment. As shown in FIG. 2, the plug portion 11 of the insert holder 10 of this example is attached to the side of the insert 6 where the opening is formed, and the protrusion 20 is inserted into the small-diameter setting hole 41 that has been previously opened in the mold 40. , The insert 6 is set in the mold 40. The ribs 22 are combined in a cross shape, and the protrusion 20 has a shape that can be substantially elastically deformed in accordance with the inner diameter of the setting hole 41. Therefore, the protrusion 20 can be mounted in the setting hole 41 relatively easily by a worker pushing it by hand or tapping it with a hammer. As described above, in the insert holder of this example, the insert 6 can be easily mounted by one worker from the front side 40a of the mold 40, and it does not take time and effort. Further, the tip 23 of the protrusion 20 of this example is round and thin, and the protrusion 20 naturally fits into the setting hole 41. This tip 2
3 does not need to be an acute angle because it is sufficient to guide the protrusion to the setting hole 41 that is open in advance, and conversely, an obtuse angle, that is, a non-angle, is provided so as not to damage the worker or clothing worn by the worker. It has a spire shape. When the protrusion 20 is inserted into the setting hole 41, the protrusion 20 is fitted into the setting hole 41.
Further, since the portion 24a corresponding to the thickness of the mold 40 spreads at the place where the setting hole 41 is passed and presses the back side 40b of the mold 40, the protrusion 20 allows the insert holder 1 to be inserted.
The insert 6 is set to the mold 40 sufficiently firmly through 0. Therefore, even if concrete is poured into the mold 40 in which the insert 6 is set thereafter, the insert 6 does not shift from the predetermined position. After that, concrete is poured into the formwork in which the insert is set to form the concrete product 2 having a predetermined shape.

FIG. 3 shows how the concrete product is demolded. When the mold set for the insert 6 is an inner mold, the concrete product 2 is moved to the inner mold 40 when demolding.
Suspend with the inner formwork 40 by using vibration or air pressure
Are separated along the inner surface of the concrete product 2. At this time, the connecting portion 25 between the protrusion 20 and the plug 11 is
It is cut automatically by the shearing force acting between the concrete product 2 and the form 40. Therefore, it is not necessary to perform any pre-demolding work such as removing the mounting bolt as in the conventional case. Further, since the connecting portion 25 is divided by the force acting at the time of demolding, no extra labor or work such as adding a new force occurs. Further, the protruding portion 20 that has been cut and left in the setting hole 41 can be easily removed by pushing it with something like a wire, so that cleaning and the like are not required. If an insert holder is attached to set an insert to be embedded in the next concrete product, it is possible to push out the protruding portion 20 that has been cut and left in the setting hole 41 by the protruding portion 20. If the connecting portion 25 expands slightly toward the tip like the protruding portion 20 of the present example, it becomes easy to push out the protruding portion 20 cut from the setting hole 41.

Even when the insert is set in a mold which is rotated and released from the mold like the outer mold, the protrusion 20 is divided by the force of rotating the mold. Alternatively, the setting hole 4
In some cases, the protrusion 20 may simply come off from 1. that time,
Since the protruding portion 20 is simply separated from the connecting portion 25 and the rib 22 is deformed, the force for removing the plug portion 11 housed inside the insert does not work. Therefore, it does not cause an obstacle when the formwork is swung, or does not cause a chip in the concrete product. Therefore, even if the turning radius of the formwork is small, the insert can be set without anxiety.

After the mold is removed, the setting surface 12 of the insert holder 10 appears on the surface of the concrete product 2 as shown in FIG. Therefore, the operation part 30 for removing the plug part 11 also appears on the surface of the concrete product, and if the removal jig 35 is inserted into the operation part 30 and the plug part 11 is rotated in the reverse direction, the plug part 11 can be easily removed. Can be removed. The protruding portion 20 is cut, and only the cut mark 29 can be seen.
It does not become an obstacle when using the operation unit 30. If the plug part 11 is attached to the insert 6 until just before use in the field, dust and water will not enter the insert 6, so that problems such as dust and rust can be prevented. Conventionally, after removing the mold, a cap or the like is newly attached, but if the insert holder of this example is used, such a trouble is not required. When pouring concrete, the plug portion 11 allows the insert 6
I can't go inside. As described above, by using the insert holder 10 of the present example, it is possible to prevent the embedded insert from becoming unusable, and further, it is possible to save the trouble of cleaning with air or the like before using.

As shown by the cross section in FIG. 1 (b), the plug portion 11 of the insert holder of this example has a cylindrical shape opened on the side opposite to the protruding portion 20 with respect to the setting surface 12, and has an internal shape. 17 is hollow. On the other hand, the protruding portion 20 having the above-described shape has a smaller diameter than the plug portion 11 and has the setting surface 12
Extends from the opposite side to the plug portion 11. Therefore, in the insert holder 10 of this example, the protruding portion 20 and the plug portion 11 can be molded from their respective sides using the respective dies while sandwiching the setting surface 12. That is, the mold surface 40 side from the setting surface 12 can be formed by using a mold for forming the protrusion 20, and the opposite side can be formed by a mold for forming the plug portion 11. Therefore,
The entire insert holder can be easily molded from plastic materials such as polyethylene and polypropylene.

The outer diameter of the plug portion 11 is often 8 to 10 mm or exceeds this dimension in accordance with the inner diameter of the insert. When molding a plastic material, a thick wall causes a long cooling time, which causes sink marks and bubbles. If the wall thickness is about 4 mm or more, distortion is likely to occur due to sink marks, and it becomes difficult to secure the dimensional accuracy of the plug portion 11. However, like the insert holder of this example, if the projection 20 and the plug 11 can be molded by the setting surface 12, the wall thickness of the plug 11 can be easily managed. That is, if the outer diameter of the plug portion 11 is increased, the insert holder of this example can employ the hollow plug portion 11 that is open on the side opposite to the setting surface 12,
The wall thickness can be set within a predetermined range. Therefore, it is possible to provide the plug portion 11 that can be inserted into the insert, securely hold the insert, and seal the opening of the insert.

Unless the plug portion 11 and the protruding portion 20 can be molded by the setting surface 12, an opening is required on the protruding portion 20 side in order to make the plug portion 11 hollow. Therefore, the protrusion has to be hollow with the same diameter as the plug 11, and the shape of the protrusion is limited and the diameter becomes large. On the other hand, in the insert holder 10 of this example, since the plug portion 11 and the protrusion 20 can be designed separately, there is no problem even if the elongated protrusion is adopted. It is also possible to extend the plurality of protrusions 20 from the setting surface 12, and it is not necessary to change the shape of the plug 11 by this. In this way, by providing the setting surface 12, even an insert holder having a thin protrusion as in this example or a protrusion formed by combining ribs can be manufactured easily and at low cost.

Further, as shown in FIG. 2, when the insert holder 10 of this example is used, a small-diameter setting hole 41 into which the projection 20 can be inserted is predetermined as a form 40 for molding a concrete product. A mold opened at the position may be used. Since the outer diameter of the protrusion 20 in this example is about 5 mm, the inner diameter of the setting hole 41 may be about 5 mm. In detail, since it is necessary to obtain the adhesive force for holding the insert 6 in the mold 40 by inserting the protrusion 20 into the setting hole 41, the outer diameter of the protrusion 20 and the inner diameter of the setting hole 41 are fitted to each other. Especially, it is desirable to select a tight fit or tight fit.

It is preferable that the setting hole 41 opened in the mold be as small as possible, and the diameter of the setting hole 41 is preferably such that the diameter of the setting hole 41 is naturally clogged with the clay of the concrete, for example, about 8 mm or less. Also, considering the strength of the protrusions 20 and the like,
The outer diameter of the protrusion 20 is about 2 mm or more, preferably 3 mm
Therefore, the inner diameter of the setting hole 41 is preferably about 2 mm or more, more preferably about 3 mm or more. Diameter 10mm
Even if it is a little, it can be easily closed without using welding with tape or the like, and the formwork is not adversely affected. In this way, if the insert holder of this example is used, there is no need for repairs such as distortion of the formwork even if the set position of the insert is changed, so it is reasonably possible at various places according to the customer's request. Inserts can be embedded. Further, even when the setting hole is opened in the mold in the initial stage, the occurrence of distortion or the like is small, so that it can be easily performed.

When using the durable mold 40, the setting hole 4
The protrusion 20 needs to be deformed so as not to affect 1. The protruding portion 20 of this example is formed by combining four ribs 22 in a cross shape so that the protruding portion 20 can be deformed substantially elastically, and a plastic material which can be expected to have elastic force is used as a material. When the protrusion 20 is inserted into the setting hole 41, the part inside the setting hole 41 undergoes some plastic deformation, but the inner surface of the setting hole 41 is pressed and the adhesive force that sets the insert in the mold by frictional force. Can be obtained. Further, since the part that penetrates the setting hole 41 and is exposed on the back surface 40b of the form tends to return to the original shape, it is caught in the part extending from the setting hole 41 to the back surface 40b side, and this part 24a also has an adhesive force. Obtainable.
Further, by using the protrusion 20 having a cross-sectional shape that is elastically deformed, the protrusion 20 can be easily fitted into the setting hole 41, so that there is an advantage that the operator can easily set the insert.

The number of protrusions 20 is not limited to one, and a plurality of protrusions may be provided. The insert becomes big,
Depending on manufacturing conditions such as a high injection speed of concrete, a plurality of thin protrusions may be provided on the insert holder to obtain a necessary adhesive force.

The substantially elastically deformable shape that can be used for the protrusion is not limited to this example. Any shape may be used as long as it can be deformed elastically or with some plastic deformation along the shape of the setting hole. For example, there are shapes such as a substantially crescent moon shape, a polygonal shape, and a star shape that can be contacted with two or more points for setting. Further, it is also possible to expect a substantially elastic deformation such as a protrusion having a shape in which irregularities are periodically repeated in the longitudinal direction or the circumferential direction of the protrusion, or a hollow cylindrical protrusion. . Further, as long as it is a protrusion made of an elastic material such as a plastic material, it may be a columnar protrusion that is substantially in close contact with the setting hole. Further, the shape of the setting hole is not limited to the circular shape as in this example, but may be a polygonal hole corresponding to the shape of the protrusion, or the shape of the hole changing in the thickness direction.

Since the above-described effects can be obtained if the protrusion is deformed substantially elastically in accordance with the setting hole, a metal such as aluminum, which is softer than the metal used as the mold, may be used. It is desirable to use a synthetic resin such as a plastic material from the viewpoint that it can be integrally molded with the plug portion, is inexpensive, can expect some elasticity to the material itself, and can avoid damaging the mold.

[Second Embodiment] FIG. 5 shows an outline of an insert holder 10 according to a second embodiment of the present invention.

The insert holder 10 of this example has a setting surface 1
It has a substantially columnar protrusion 20 protruding from 2, and a plug portion 11 formed on the opposite side of the protrusion 20 with respect to the setting surface 12. It should be noted that, in the following, portions common to the insert holder of this example and the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

The protrusion 20 of the insert holder 10 of this example
The tip 23 has a rounded corner and is smoothly narrowed toward the tip. Therefore, as in the first embodiment, the protrusion 20 is easily fitted into the setting hole without damaging the work clothes. Further, on the outer periphery of the protrusion 20, four ribs 22 extending in a substantially triangular shape in the radial direction of the protrusion 20 are provided.
The rib 22 of this example has a surface 22 a facing the tip of the protrusion 20.
Extends from the tip 23 toward the connecting portion 25 in the radial direction of the protrusion 20, while the surface 22b facing the connecting portion 25 extends from the tip 23 toward the connecting portion 25.
It is narrowed in the radial direction of 0. These surfaces 22a and 22
The apex 22c with b is formed at a point substantially matching the thickness of the form, and when the protrusion 20 is inserted into the setting hole of the form, the apex 22c is exposed on the back side of the form and the surface 22b is formed. Press the back of the form with. Further, the connecting portion 25 of the protrusion 20 is provided with a recess 26 along the outer peripheral surface of the protrusion 20. When a shearing force acts on the connecting portion 25 at the time of demolding, the cross-sectional area of the portion of the recess 26 becomes small, so the recess 26
The protruding portion 20 is cut from the setting surface 12 at the portion.

Similar to the first embodiment, the plug portion 11 of the present embodiment has a cylindrical shape in which the opposite side of the protruding portion 20 is opened with respect to the setting surface 12, and the outer peripheral surface 13 has a smooth resin surface. .
Therefore, if the sealing portion 14 is screwed into the insert having the female screw formed on the inner surface, the male screw is cut on the outer peripheral surface 13 of the sealing portion 14, and the plug portion 11 is attached in a state of being closely attached to the inside of the insert. it can.

With reference to FIGS. 6 to 9, the manner of manufacturing a concrete product using the insert holder of this example will be described. In this embodiment, a hexagonal high nut 91 is used as an insert, and an anchor 92 is attached to one end of the hexagonal nut 91 and embedded in a concrete product.

As shown in FIG. 6, the form 40 of this example has a small-diameter setting hole 41 pre-opened at a predetermined position where the insert is set, as in the first embodiment. Insert holder 10
Inserts the protrusion 20 into the setting hole 41 by screwing the plug portion into the opposite side of the nut 91 to the side where the anchor 92 is attached. The protruding portion 20 has a diameter that fits into the setting hole 41, and when pushed in, the rib 2 that appears on the back surface 40b side of the formwork.
2 spreads and presses the mold 40. Therefore, a high adhesive force can be obtained, and even a large insert can be reliably set in the mold. When setting the insert in the mold 40, in this example, a thin ring-shaped sealing material 98 is attached along the outer periphery of the setting surface 12 of the insert holder 10. The sealing material 98 is formed of a thin-film ring-shaped plastic foam or the like, and has some elasticity in the thickness direction. When the insert holder 10 is mounted on the mold by inserting the sealing material 98 between the setting surface 12 and the mold surface 40a, no gap is generated between the setting surface 12 and the mold surface 40a, and the concrete is not formed. It is possible to prevent slow invasion.

As shown in FIG. 7, also in the insert holder 10 of this example, if a shearing force is applied to the connecting portion 25 of the protrusion 20 as when the inner mold is released from the mold, the protrusion 20 is plugged. Divided from part 11. Therefore, it is not necessary to remove the insert holder 10. In this example, since the connection portion 25 is provided with the recess 26, the force applied at the time of demolding is concentrated on this portion, and the protrusion 20 is cut. As shown in FIG. 8, the cut protrusions are configured to be able to press the back surface 40b of the mold by the surface 22b of the rib 22, and thus are pushed out to the back surface 40b side of the mold. Therefore, the divided protrusion 20 can be easily removed from the mold 40.

As shown in FIG. 9, the setting surface 12 appears on the surface of the concrete product after demolding, and the operating portion 30 is prepared on the setting surface 12. Therefore, the operation unit 30 can be easily operated, and the plug unit 11 can be easily removed by rotating the plug unit 11. A male screw is not formed in advance on the outer peripheral surface 13 of the sealing portion 14 of this example, but since a male screw is formed on the outer peripheral surface 13 when the plug portion 11 is inserted into the insert 91, it is possible to rotate the plug portion 11 in the opposite direction. , Plug part 1
1 can be removed from the insert 91. Furthermore, in this example, the setting surface 12 is clearly shown by the sealing material 98, and the position of the insert is easy to understand. Further, since the concrete slag does not come around on the setting surface 12, the operation portion 30 can be operated reliably, and the movement of the plug portion 11 is not hindered by the slag, so that the removal work is easy. is there.

FIG. 10 shows a different modification of this embodiment. FIG. 10A shows a side surface of the insert holder 10, and the projection 50 is shown by using a cross section so that the structure can be understood. Further, FIG. 10B shows the insert holder 10 as viewed from the direction of the setting surface 12.

The insert holder 10 of this example is an integrally molded product made of resin such as plastic, and is provided with a projection 20 extending from the setting surface 12 and a plug 11.
The same parts as those in the above-described embodiment are designated by the same reference numerals and the description thereof will be omitted.

The projecting portion 20 of this example has an upper half portion 52 that spreads out from the tip 23 in a substantially conical shape, and a lower half portion 53 that is thin in a cylindrical shape. The upper half portion 52 of the protrusion of this example has a so-called Mine-Arrow shape, and the skirt portion 54 where the upper half portion 52 expands is a portion 5 that connects the upper half portion 52 and the lower half portion 53.
It is in a position retracted from 5. The length of the lower half portion 53 is set to be slightly longer than the thickness of the mold 40.
Connection part 25 between lower half 53 of protrusion 20 and setting surface 12
In addition, the notch 56 is prepared so that the cross-sectional area of the protrusion becomes narrow.

The plug portion 11 of the insert holder 10
Has a thin disc-shaped sealing portion 14,
Several threads are provided on the outer peripheral surface 13 of the sealing portion.
Therefore, when the plug portion 11 is screwed into the female screw inside the insert 6, the insert holder 10 is inserted into the insert 6
Can be set.

The operation unit 30 provided on the setting surface 12 of this example
Is provided with two grooves 31 extending in the radial direction of the setting surface 12 with the projection 20 as the center. By inserting a jig into the grooves 31 and turning the plug 11, the plug can be removed from the insert 6. ing.

FIG. 11 shows that the insert 6 is set in the mold 40 by using the insert holder 10 of this example. Even when the insert is set using the insert holder 10 of the present example, it is possible to use the mold 40 in which the setting hole 41 having the small diameter is opened at the place where the insert is set.
The insert holder 10 is provided on the attachment side 6a of the insert 6.
Then, the protruding portion 20 protruding from the plug portion 11 via the setting surface 12 is inserted into the setting hole 41. When the protrusion 50 is inserted into the setting hole 41, the upper half 52 of the protrusion 20 narrows while the tip of the protrusion passes through the setting hole 41, and the back surface 40
It spreads when it reaches b. The skirt portion 54 of the expanded upper half portion 52 presses the back surface 40b of the mold 40, and the plug portion 1
The insert 6 is pulled to the mold 40 via 1. Thereby, the adhesive force for setting the insert 6 on the mold 40 can be secured. By using such protrusions and setting the insert through the insert holder, the insert can be set to the form sufficiently firmly against the force applied to the insert when pouring concrete and the load from the vibration device. it can.

The insert 6 of this example has a mounting side 6a.
In addition, it is provided with a flange portion 6b extending outward from the main body. Further, the female screw portion inside the insert also starts from a position slightly retracted from the mounting side 6a. Therefore, the setting surface 12 of the insert holder 10 is directly connected to the mold 40.
Insert holder 10 that is not in contact with the surface 40a of the
A stable state is secured by pulling the insert 6 toward the mold 40 via the and pressing the flange portion 6b of the insert against the mold.

In FIG. 12, the insert 6 is attached to the mold by the insert holder 10 of this example, and the insert 6
It is shown that the buried concrete product 2 is removed from the mold. Also in the insert holder of this example, the force at the time of demolding is concentrated on the connecting portion 25 of the protrusion 20, so that the protrusion 20
Is separated from the cut 26. Further, in this example, since the lower half portion 53 of the protrusion 20 may be thinner than the setting hole 41, the protrusion 20 remaining on the mold 40 will not be clogged with the lower half 53, and can be removed more easily. . It should be noted that instead of the type in which the protrusion is divided, the strength of the upper half portion 52 may be reduced so that the skirt portion and the like are easily broken. In the case of such a protrusion, the upper half portion 52 is destroyed by the force at the time of demolding, so that the protrusion itself is demolded in the state of being attached to the plug part 11.

FIG. 12 shows how the plug portion 11 of the insert holder 10 of this example is removed. When removing the plug portion 11 of this example, it is also possible to rotate and remove it by using a removing jig 35 as shown in FIG. In addition to that, as shown in FIG.
May be hit with a jig such as a hammer or a rod 37. Plug part 11 molded with resin such as plastic
Since only a few threads are prepared in the sealing portion 14 of No. 3, when the plug portion 11 is tapped, those threads are destroyed,
The plug part 11 can be pushed into the insert 6. This allows the insert 6 to be used. Since the force required to set the insert 6 on the mold 40 is not so large, the number of male threads 13 provided on the plug portion 11 may be small. Therefore, the above-described removal method is possible. Alternatively, the plug portion 11 may be broken and removed by hitting the groove 31 prepared as the operation portion 30 on the setting surface 12 with a driver or the like. The removing method may be determined in consideration of the installation direction of the insert, the purpose of use of the insert, and the like.

14 and 15 show different examples of the insert holder 10 according to this embodiment. The protrusion 20 of the insert holder 10 shown in FIG.
Is a truncated cone-shaped cylinder 5 that tapers toward the tip.
7a, and the connecting portion 25 is a circular truncated cone 57b that is slightly narrowed toward the setting surface 12. The place 57c where these two truncated cones are combined is located at a position corresponding to the thickness of the mold 40, and this place 57c is the place where the protrusion 20 spreads to the outermost side. Therefore, also in the insert holder 10 of this example,
The tip 23 of the protrusion 20 is gradually narrowed, and the truncated cone-shaped portion 57a that is narrowed toward the tip is formed on the rear surface 4 of the form.
It spreads when it goes to 0b. When pulled by this, the portion close to the combined portion 57c of the frustoconical portions 57b presses the rear surface side portion of the setting hole 41, and a large adhesive force can be secured. Furthermore, the frustoconical portion 57b has the smallest cross-sectional area in the vicinity of the connecting portion 25, and the projection 20 is cut from this portion when the mold is released.

The insert holder 10 shown in FIG. 15 is provided with a protrusion 20 in the shape of a circular truncated cone that is tapered toward the tip, similar to that shown in FIG.

The vicinity of the connecting portion 25 of the protrusion 20 of this example is cylindrical, and a plurality of notches 58 are provided in that portion along the extending direction of the protrusion 20. Therefore, the cross-sectional area in the vicinity of the connecting portion 25 is reduced, and the protrusion 20 is smoothly divided by the force exerted when releasing the mold.

[Third Embodiment] FIG. 16 shows a third embodiment of the present invention.
The outline of the insert holder concerning this is shown. The insert holder 10 of this example includes a plug portion 11 to be inserted into the insert 6 and a protrusion portion 20 protruding from the setting surface 12 of the plug portion 11 facing the mold, and is made of polypropylene or the like as a whole. , Which are often used in general, and engineering materials such as reinforced polyethylene and glass fiber reinforced plastic, are integrally molded. The insert holder 10 of this example sandwiches the protruding portion 20 of the setting surface 12,
Two upper and lower surfaces 32 in the drawing retreat in the shape of steps to form the operation portion 30. Then, following this surface 32, the sealing portion 14 extends on the side opposite to the protruding portion 20, and a male screw is formed on this outer peripheral surface 13. That is, a pedestal-like member is formed by the side surface 33 that rises substantially in parallel from the surface 32 that constitutes the operation portion, and the setting surface 1
Two are provided. Then, by hooking a jig on the side surface 33 and rotating the plug portion 11, the plug portion 11 can be removed.

The protrusion 20 of the insert holder 10 of this example
Is a rod-shaped portion 61 whose tip 23 is hemispherical, and 4 which extends from the surface of the setting surface 12 along the rod-shaped portion 61.
It is formed from the convex portion 62 of the book. The four convex portions 62 are
They are evenly arranged around the rod-shaped portion 61, and the respective convex portions are lowered near the tip 23, and are smoothly connected to the tip 23 of the rod-shaped portion 61. In this example,
The protrusion 20 having such a shape is formed integrally with the plug portion 11, but the protrusion 20 may be cut out, or the formed protrusion may be attached to the plug portion 11 with an adhesive or the like.

FIG. 17 shows how the insert holder 10 of this embodiment is attached to the insert 6. The insert 6 of the present example is inserted into the tubular body 71 of the insert holder 70 used for a control panel, and the insert holder 10 of the present example is inserted from the opposite side 72 of the tubular body 71. When the insert holder 10 of this example is screwed into the insert 6, the male screw 13 of the plug portion 11 fits into the female screw 7 of the insert 6, and the insert holder 10 can be attached to the insert 6. Since the setting surface 12 of the plug portion 11 extends from the sealing portion 14 toward the mold, it is located near the open end of the insert holder 70. Therefore, the protrusion 20 projects in the direction of the mold 40 from the insert holder 70 in which the insert 6 is fitted. Thus, the insert holder 10 of this example
Can be used in combination with an insert holder for a control panel.

FIG. 18 shows how the insert holder 10 of this example is used to set the insert 6 in the mold 40. The mold 40 for setting an insert using the insert holder 10 of the present example has an inner diameter of the insert 6 and an insert holder 7 for a control panel at substantially the center of a predetermined place 45.
Since the setting hole 41 smaller than the inner diameter of 0 is opened, a large hole like the conventional durable mold is not necessary.

FIG. 19 is an enlarged view showing a state in which the protrusion 20 is inserted into the setting hole 41. When the protrusion 20 having the shape as in this example is inserted into the setting hole 41 having a diameter slightly smaller than the outer diameter of the protrusion 20 formed in the mold, the protrusion 22 is formed.
Deforms along the hole 41, and the insert holder 10 is firmly set by obtaining an adhesive force due to the elastic repulsive force at this time and the frictional force when it comes into close contact with the hole 41. Further, since the insert holder 10 of the present example is entirely molded with resin such as plastic, the rod-shaped portion 61 is also elastically deformed to enhance the adhesive force to the mold. Furthermore, since the protrusion 20 is longer than the thickness of the mold, the tip 23 side of the protrusion 20 penetrating the mold tends to swell to the original diameter. Therefore, the tip 23 side pulls the plug portion 11 toward the mold side, and the adhesive force of the insert holder is increased. Since such a protrusion 20 can obtain sufficient adhesive force, the diameter of the protrusion 20 should be smaller than the diameter of the plug 11 in order to counter the force applied to the insert due to concrete injection or subsequent vibration. May be. Also, the setting surface 12
Since the protrusion 20 projects from the protrusion, even a protrusion having a small diameter can be manufactured without any problem.

The length of the protrusion 20 varies depending on the thickness of the plate used for the mold, but the thickness of the mold is 3.2 to 4.
Since a 5 mm iron plate is often used, the protrusion 20
The length may be about 6 to 15 mm. In order to increase the contact area between the setting hole 41 and the protruding portion 20, it is possible to provide a sheath tube on the back surface of the form along the setting hole 41. In such a case, the length of the protruding portion 20 can be increased. Becomes longer. Since the protrusion 20 is inserted into the setting hole 41 formed in the mold to obtain the adhesive force, the insert can be stably set even if the surface of the mold 40 is coated with oil, mold release agent, or the like. it can.

In this example, the flange portion 73 of the conventional insert holder 70 is brought into close contact with the surface 40a of the form 40 to prevent the concrete ladle from entering the setting surface 12 or the operating portion 30. To prevent. Further, when the insert holder 10 of this example is used, the open end of the insert 6 is completely sealed by the sealing portion 14, so that even if concrete leaks from the flange portion 73, No concrete can enter inside.
Further, a sealing member made of an elastic material such as sponge as in the above embodiment may be provided in advance.

FIG. 20 shows a state in which the protrusion 20 of the insert holder 10 is cut by the force acting at the time of demolding in this example. The inner mold 40 is slightly lifted upward together with the concrete product by a crane or the like, and the inner mold 40 is dropped downward by a method such as vibration or air injection. When the formwork falls, a force larger than the adhesive force between the formwork and the concrete acts between the formwork and the concrete surface, and this force causes the protrusion 20 inserted in the formwork 40 to be removed from the plug portion 11. It is divided, or the protruding portion 20 comes out from the setting hole 41 of the mold 40. Therefore, if the insert is set using the insert holder according to the present example, the inner formwork can be demolded in the same process as that for the concrete product without the buried object, even if the concrete product has the buried insert. . Since the insert 6 is already embedded in the concrete product 2, there is no possibility that the insert 6 will be damaged or the embedded position will not be displaced by the force when the projection 20 is divided or when it is removed from the formwork. .

Even when the insert holder of this example is used, safe and efficient work can be performed when removing the mold. In addition, the setting hole prepared in the mold can be small, and the setting position of the insert can be changed flexibly according to the customer's request.

FIG. 21 shows the plug portion 11 of the insert holder.
Is shown to be removed. For example, a substantially U-shaped jig 35 may be inserted into the operation portion 30 formed on the setting surface 12, and the plug portion 11 may be rotated and removed. As a result, the insert 6 with its inner surface kept clean appears.
The insert 6 can be used at any time without any trouble. If the embedded insert is not used in the field, plug 11
If you leave it in the fitted state, rust will not be generated from the insert, and you can keep it ready to use when needed.

The retracted surface 3 which constitutes the operating portion 30.
The shape of 2 is not limited to this example, as long as it has a shape capable of forming a gap into which an appropriate jig can be inserted during the removal. For example, it may be a dent having a circular shape or a pedestal having a polygonal surface.

[Fourth Embodiment] FIGS. 22 and 23 show an outline of an insert holder 10 according to a fourth embodiment of the present invention. The insert holder 10 of this example includes a cylindrical plug portion 11 as in the first embodiment, and three projecting portions 20 project from the setting surface 12. The shape of each protrusion 20 is substantially the same as the shape of the protrusions of the first embodiment described with reference to FIG. Furthermore, the setting surface 1 of this example
A groove 34 is formed as an operating portion 30 at substantially the center of the groove 2. The groove 34 extends substantially perpendicular to the central axis of the insert holder. The parts common to the insert holder of the present embodiment and the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted.

Since the insert holder 10 of this embodiment is provided with the plurality of protrusions 20 along the periphery of the setting surface 12,
Even if the operation unit 30 is arranged in the center of the setting surface 12, the protrusion 20
The operation unit 30 is easy to operate and the manufacturing is easy. Further, by providing a plurality of protrusions, it is possible to reduce the adhesive force that can be obtained per one, so that the diameter of the protrusions can be reduced. The number of protrusions is not limited to this example, and may be three or more. In the insert holder of the present invention, since these protrusions are provided on the setting surface, the shape of the plug portion is not affected even if the number of protrusions changes. In addition, the operation unit 30
The shape of is not limited to one groove as in this example, and various shapes such as a cross groove and a recess into which a hexagon wrench is inserted can be adopted.

In the formwork corresponding to the insert holder of this example, three setting holes may be opened in the same arrangement as the three projecting portions 20. The shape of each setting hole may be a small diameter corresponding to the protruding portion 20, high precision and ready for demolding,
You can use a formwork that can change the setting position of the insert.

FIG. 24 shows the molded concrete product 2
It is shown that the plug portion 11 is removed from the insert 6 embedded in. When the insert holder 10 of this example is used, the projecting portion 20 is cut by the force exerted at the time of demolding, so that the projecting portion 20 is formed on the molded concrete product.
Only the cut mark 29 of the above remains. Therefore, if the operating portion 30 at the center of the setting surface 12 exposed on the surface of the concrete product is rotated by the driver 35, the plug portion 11 can be easily removed and an insert free from dust can be used.

FIG. 25 shows a different example of the insert holder according to this embodiment. Insert holder 1 of this example
0 is molded from a plastic material and the setting surface 1
Two substantially cylindrical projections 20 are projected from 2. These cylindrical protrusions 20 have the tips 23 of which are angled so that they can be easily inserted into the setting holes. Further, this prevents the worker and work clothes from being damaged. The connecting portion 25 of each protrusion 20 is provided with a recess 26 in the circumferential direction so as to have a small cross-section, and the protrusion 20 is cut from this recess 26 when a cutting force acts at the time of demolding. ing.

FIG. 26 shows how the insert holder 10 of this example is used to set an insert, which in this example is a nut 91 attached to an anchor 92. When the insert holder 10 of this example is used, a mold 40 having two small-diameter setting holes 41 at positions corresponding to the protrusions 20 is used. When the cylindrical protrusion 20 is inserted into the setting hole 41,
The portion inserted into the setting hole 41 bends, and the front and back thereof bulge. Therefore, the back surface 40b of the mold is pressed by the frictional force in the setting hole 41 and the protruding portion 20 in a bent state, so that a sufficient adhesive force can be obtained. Furthermore, since the insert can be set in the mold using the two protrusions 20, even a large insert holder can be set in the mold sufficiently firmly.

FIG. 27 shows a concrete product in which the insert 91 is buried by using the insert holder 10 of this embodiment. Also in the cylindrical protrusion 20 as in this example, when a force such as a shearing force generated at the time of demolding is applied to the connecting portion 25, the protrusion 20 is cut, which is troublesome as in a concrete product in which an insert is not embedded. You can perform demolding work without hanging. The cylindrical protrusion 20 of this example has an outer diameter of about 3 to 8 mm, or about 10 mm, so that the cross-sectional area of each connecting portion is not increased. This prevents distortion of the circular cross section, which tends to occur on the projection with a large diameter, and crushing in the circumferential direction, and promotes smooth cutting so that the plug and sealing parts are not affected. . Further, by adopting a small-diameter projection, it is possible to adopt a cylindrical projection having no hollow portion instead of a cylindrical shape, and prevent the influence of distortion or crushing of the projection.

FIG. 28 shows an insert holder 10 having two protrusions 20 having a different shape from the above according to this embodiment. The rough shape of the protrusion 20 shown in this figure is
The upper half 52 tapers from the tip 23, while
From the upper half 52 to the lower half 53, the width gradually decreases. The protrusion 50 has a pillar 63 protruding from the setting surface 12 of the plug portion 11 toward the tip 23, and a member 64 having a side surface connecting the pillar 63 at the tip 23 and extending from the upper half to the lower half as described above. It is composed of and
And a member 64 is provided with a gap. Also, the pillar 63
A notch 56 is provided near the connecting portion 25 of the
0 is designed to be easily cut. Since the protrusion having such a shape is molded into an elastic shape, a hard plastic excellent in moldability such as ABS resin or PPO may be used as a material. When the protrusion is formed by using a material having a higher elasticity, for example, soft PVC, the gap shown in FIG. 28 may not be provided.

When the protrusion 20 of this example is inserted into the setting hole 41, the upper half portion 52 penetrating the hole 41 expands, and subsequently, the portion 57 connecting the upper half portion 52 to the lower half portion 53 also expands. Therefore, the hole 41 and the portion 57 extending from the upper half portion 52 to the lower half portion 55 press the setting hole 41 itself from the back surface side 40b of the form of the setting hole 41, so that the insert 6 is inserted through the plug portion 11. It can be set on the form 40. Further, since the projection 20 is cut or pulled out from the mold by the force applied at the time of demolding, a demolding process similar to that of the concrete secondary product in which the insert 6 is not embedded is similar to the above embodiment. Can be adopted. In order to efficiently cut the protrusion 20 at the time of demolding, the lower half portion 53 has a reverse taper shape, that is, the setting surface 12 as in some of the examples described above.
It may be shaped so as to taper toward.

FIG. 29 shows a different example of the insert holder according to this embodiment. Insert holder 1 of this example
0 has two protrusions 20, and each protrusion 20
Comprises an elongated strut 63 and a hook-like portion 66 extending at the tip thereof to the outside of the insert holder, and the hook-like portion 66 extends on the opposite side. Further, the distance L1 between the columns 63 is longer than the interval L2 between the centers of the setting holes 41, and when the protrusion 20 of the insert holder 10 of this example is inserted into the mold 40, the insert holder of the columns 63. 10
The surface that hits the outside of the center of the hits the setting hole 41,
The adhesive force due to friction can be obtained at this portion. Further, since the hook-shaped portion 66 penetrating the mold extends to the opposite side on the back surface side of the mold, the insert holder is hooked on the back surface side 40b of the mold by these portions 66. Due to these forces, the insert holder of this example can obtain sufficient adhesive force to set the insert in the mold.

The relationship between the distance L1 between the columns and the distance L2 between the setting holes 41 may be opposite to that in this example, and the hook-shaped portion 6
Of course, 6 may extend inward. Although it is possible to provide a setting hole in the form frame into which the plurality of protrusions can be inserted at the same time, from the viewpoint of reducing the diameter of the setting hole, the setting hole is opened corresponding to each protrusion. Is desirable.

In addition, when a directional load is applied to the insert due to the inflow direction of concrete, etc.,
It is also possible to prevent the insert from tilting or coming off by providing a plurality of protrusions and adjusting their directions and arrangements.

Further, when a plurality of protrusions are provided on the setting surface, these protrusions are arranged along the periphery of the setting surface, and an opening is provided in the setting surface at approximately the center, on the side opposite to the above embodiment.
That is, a hollow plug portion opened on the side of the protrusion may be formed. The operating portion may be provided inside the plug portion, but it is preferable to provide the operating portion on a setting surface that appears on the surface of concrete in terms of operating from the surface of the concrete product.

[Fifth Embodiment] FIG. 30 shows a fifth embodiment of the present invention.
The outline of the insert holder concerning this is shown. Further, FIG. 31 shows a state in which the insert holder 10 of the present example is attached by using the tubular body 71 of the insert holder 70 that covers the open end of the insert 6. In the insert holder 10 of this example, the plug portion 11 can be set in the opening 72 of the insert holder 70 that covers the opening side of the insert 6. Therefore, a male screw 18 is formed on the outer peripheral portion 13 of the sealing portion 14 of the plug portion 11. Further, there is provided a protruding portion 20 protruding from the setting surface 12 and having a combination of four ribs 22, and is integrally molded from a synthetic resin such as a plastic material. The parts of the insert holder of this example which are common to those of the above-described embodiments are designated by the same reference numerals and the description thereof is omitted.

The male screw 18 provided on the outer peripheral surface 13 of the sealing portion 14 of the present example has a plurality of divided threads. That is, a mountain-cut region 18c is provided between the tip 18a and the end 18b of the male screw 18. Therefore, the plug portion 1 of the insert holder 10 of the present example is inserted into the opening 72 of the conventional insert holder 70 on the opening side of the insert 6.
If you screw in 1, the internal thread will be cut inside the opening 72,
The plug part 11 can be fixed. Therefore, the opening side of the insert 6 can be sealed by the plug portion 11 mounted on the insert holder 70. Further, since the ridge of the male screw 18 on the plug side is divided, the movement of the plug portion 11 is hindered by the resin portion on the inner surface of the insert holder 70 that is in contact with the ridge cut region 18c. Therefore, the insert holder is difficult to rotate and does not come off due to vibration or the like that occurs during the production of the concrete product.

On the other hand, the projecting portion 20 of this example is composed of four ribs 22 assembled at approximately 90 ° intervals,
Each rib 22 has a substantially rectangular shape. The corner of the rib 22 close to the tip 23 is dropped so that it can be easily inserted into a setting hole of an insert prepared in the mold. The outer diameter of the protrusion 20 formed by these four ribs 22 is smaller than the inner diameter of the insert 6 as in the above embodiment.

The projecting portion 20 of this example is a projecting portion that can be inserted into the setting hole or screwed in, and the case of screwing in will be described below as an example. Further, the outer peripheral surface 28 of the rib 22 of this example is not provided with a male screw in advance, and the male screw is cut when it is screwed into the setting hole of the mold.

FIG. 32 shows how the insert holder 10 of this example is used to set the insert 6 on the durable mold 40 made of an iron plate or the like. In the mold using the insert holder of this example, a small-diameter setting hole 41 is formed substantially at the center of a predetermined position 45 for setting the insert, and an internal thread 42 is cut on the inner surface thereof. Then, when setting the insert, the insert holder 10 of this example is attached to the insert holder 70 in advance, and the insert 6 is held and rotated. The rib 22 of the protrusion is threaded by the female screw 42 on the inner surface of the setting hole 41, and the protrusion 20 is attached to the setting hole 41.

When the protrusion 20 of the insert holder of this example is screwed into the setting hole 41, the setting surface 12 of the flange 15 contacts the surface 40a of the form and cannot be screwed to a certain extent. Also, when the insert holder 70 is screwed into the plug portion 11, the insert holder 70 hits the flange portion 15 and cannot be screwed. In this way, the flange portion 15 constitutes the setting surface 12 and also functions as a stopper. Further, since the flange portion 15 functions as a stopper, the insert holder 10 can be rotated by holding the insert 6 to screw the protrusion 20 into the setting hole 41. On the contrary, the insert holder 10 may be attached to the formwork first, and then the insert 6 may be attached.

The setting hole 41 provided in the region 45 where the opening of the insert is located may have a small diameter even when the internal thread 42 is provided therein. Therefore, there is little influence on the formwork, and it is easy to change the setting place of the insert.

As shown in FIG. 33, when the protrusion 20 is screwed into the setting hole 41, a male screw is formed on the outer peripheral surface 28 of the resin rib 22, so that the insert holder 10 of this embodiment is used to insert the insert. 6 can be fixed in place on the form 40. In the insert holder 10 of this example, the insert 6 is screwed to the form 40 to obtain an adhesive force that prevents the insert from being dislocated or displaced even when concrete is poured or vibration is applied.

FIG. 34 shows that the mold 40 is slid like an inner mold to remove the mold.

When the mold is removed, the projecting portion 20 is sheared by the shearing force acting between the mold and the concrete product. With the insert holder 10 of this example, it is possible to eliminate the trouble of loosening the bolt before the mold is removed. Since it is not necessary, it can be demolded in the same process as a concrete product in which the insert is not buried.

The cut protrusions 20 remaining on the mold 40
Can be easily removed by inserting a jig into the gap between the ribs 22 and rotating the jig. Alternatively, if the remaining protrusion 20 is pushed in with a suitable rod, the male screw formed on the outer peripheral surface of the resin rib 22 is destroyed, and the protrusion 2 is formed on the rear surface side of the mold 40.
0 can be discharged.

FIG. 35 shows that the outer mold and the mold 40 used when there is a space inside the mold are swung and released from the mold. When the mold release is performed in this way, a tensile force is applied to the protrusion 20. When the male screw formed on the outer peripheral surface 28 of the rib 22 is destroyed by this pulling force, the protrusion 20 is pulled out from the setting hole 41 of the mold 40 together with the plug portion 11 fixed to the insert 6. When a large adhesive force is required, a nut or the like can be welded to the back surface 40b of the form to strengthen the adhesive force. In some cases, the projecting portion 20 may be divided by the pulling force at the time of demolding as in FIG. 34. As described above, even when the mold is rotated and removed, the work can be performed in the same process as that of the concrete product in which the insert is not buried. After the mold is removed, the jig 35 having a substantially U shape is attached to the operation unit 30 formed on the setting surface 12.
The insert can be used if the plug portion 11 is rotated by hitting against.

It should be noted that the insert holder of this example has four protrusions.
Although the shape is a combination of ribs, the number of ribs is not limited to four. Further, it is of course possible to form a male screw on the outer peripheral surface of the rib in advance. Further, in order to facilitate cutting, a cut may be provided at the boundary between the projection and the surface of the flange portion so that the cross-sectional area of the projection can be reduced.

[Sixth Embodiment] FIG. 36 shows an insert holder 10 according to a sixth embodiment of the present invention. FIG. 37 (a) shows the side surface of the insert holder 10 of the present embodiment, and FIG.
(B) shows the front surface of the insert holder 10 of the present example. The insert holder 10 of this example is an integrally molded product made of resin such as plastic, and includes a plug portion 11 that can be screwed into the opening side of the insert, a setting surface 12 that spreads to the mold side, and a protruding portion from the setting surface 12. The projection 20 is provided. The parts of the insert holder of this embodiment that are common to those of the above-described embodiments are designated by the same reference numerals, and description thereof will be omitted.

The plug portion 11 of this example is of a type that is directly inserted into the insert 6, and the outer peripheral surface 13 of the plug portion 11 is formed with a male screw matching the female screw prepared inside the insert 6. There is. Further, the protrusion 20 of this example is a column having a smaller diameter than the plug 11, and the tip thereof is slightly angled so that it can be easily inserted into a setting hole prepared in the mold. The outer peripheral surface 28 of the protrusion 20 is formed with a male screw that matches the female screw formed in the setting hole, and the connecting portion 25 between the protrusion 20 and the setting surface 12 has a direction in which the protrusion 20 extends. A hole 68 penetrating the protrusion 20 is provided perpendicularly to. This hole 68 is provided in order to reduce the cross-sectional area of the connecting portion 25, and the projection is easily cut from this portion. Further, the setting surface 12 is provided with a groove 34 at a position corresponding to the above-mentioned hole 68 that traverses the protruding portion 20, and when the protruding portion 20 is cut, the straight groove 34 is operated on the setting surface 12. It appears as part 30.

As shown in FIG. 38, the insert holder 10 of the present example is used to insert the insert 6 using the projection 20 and the groove 34.
The plug portion 11 can be mounted inside the insert 6 by screwing the plug portion 11 into the insert 6, and the plug portion 11 can seal the open side of the insert 6. The protrusion 20 of this example is formed in a cylindrical shape having no hollow portion inside because the outer diameter can be reduced without being influenced by the diameter of the plug portion 11. If the outer diameter of the protrusion is small, the cross-sectional area of the portion to be cut can be reduced even if it is not a hollow protrusion, so a cylindrical protrusion that is easy to manufacture is adopted. If a small-diameter columnar protrusion or a thick protrusion by reducing the diameter even if there is a space inside, the circumferential part of the protrusion may be dented or distorted by the shearing force that acts during mold release. There are few, and the protrusion is cut smoothly.

FIG. 39 shows a state in which the protruding portion 20 is cut from the plug portion 11 at the time of demolding. When a shearing force is applied at the time of demolding, the projecting portion 20 is separated from the plug portion 11, and the setting surface 12 appears on the surface of the concrete product. Then, the cut mark of the protrusion 20 is the groove 3 as the operation unit.
Since it overlaps with 4, insert a jig such as a screwdriver,
The plug part 11 can be easily removed.

40 and 41 show a modification of the insert holder according to this embodiment. This insert holder 10 has substantially the same configuration as the one described above, but no male screw is formed on the outer peripheral surface 13 of the plug portion 11 and the outer peripheral surface 28 of the protruding portion 20, and a smooth surface made of resin is used. Is appearing. In addition, the inside of the plug portion 11 is a hollow 17 opened on the side opposite to the setting surface 12 as in the above-described embodiment to reduce the amount of resin required for molding and to prevent sink marks and distortion during molding. is doing.

Since the plug portion 11 of this example is made of resin,
When screwed into the female screw 7 of the insert 6, a male screw is formed on the outer peripheral surface of the plug portion 11, and the insert 6 can be mounted in a state in which the opening side is sealed. Further, if the protrusion 20 is also screwed into the setting hole 41 in which a female screw is prepared, a male screw is formed on the outer peripheral surface 28 of the protrusion 20 and sufficient adhesive force for setting the insert 6 in the mold can be obtained. .

[0121]

As described above, the insert holder according to the present invention is provided with the plug portion to be mounted on the insert side and the protrusion protruding from the setting surface of the plug portion. The insert can be set in the mold by mounting it in a setting hole prepared in advance in the mold. If the insert is set by the insert holder according to the present invention, other jigs such as setting bolts are unnecessary, and there is no need to attach or remove these jigs to the formwork. Therefore, even a single worker can easily set the insert at a predetermined position of the mold in a short time.

Further, at the time of demolding, the projecting portion is cut by the force related to the demolding or is removed from the mold, so that the work can be performed in the same step as the concrete product in which the insert is not embedded. If you set the insert using the insert holder according to the present invention to the inner formwork which is out of reach, the concrete product and the formwork can be lifted upside down together with the conventional concrete product, or the insert can be fixed from the jacked up bottom. You can save labor by eliminating the dangerous process of removing the screws.
Further, in the case of the mold which is removed by turning, even if the insert is attached to a place having a small turning radius, no chipping occurs.

Further, since the opening side of the insert is closed by the plug portion of the insert holder, the ladle at the time of pouring concrete does not enter the inside of the insert. After the mold is removed, the plug part prevents dust and water from entering, so that the inside of the insert can be protected from being clogged or rusted. Therefore, it is possible to save the trouble of attaching the cap after the concrete product is molded.

In addition, in the insert holder of this example, the portion to be operated when removing the plug portion is formed on the setting surface, and since it appears on the surface of the concrete product after demolding, it is easy to operate and can be removed. Work can be done reliably in a short time.

Furthermore, in the insert holder according to the present invention, since the protrusion projects from the setting surface, it is possible to form a protrusion having a small diameter regardless of the size of the plug. This makes it possible to reduce the setting holes prepared in the formwork,
Prevents deterioration of the precision of the mold, and can flexibly respond to changes in the insert position. In addition, since the plug part can be designed separately from the shape of the protrusion, it is possible to adopt a shape that can prevent the occurrence of sink marks, distortion, etc., which is a problem when molding with a plastic material, etc., and the insert holder according to the present invention is inexpensive. Can be provided to.

As described above, by adopting the insert holder according to the present invention, the labor of the worker can be reduced,
It can shorten the manufacturing period and cost of concrete products, and can respond flexibly to customer requirements.
Therefore, the insert holder of the present invention is suitable for increasing the production of factory prefabricated concrete products and supplying large-scale, highly functional concrete products.

[Brief description of drawings]

FIG. 1 is a perspective view (a) and a cross-sectional view (b) showing an outline of an insert holder according to a first embodiment of the present invention.

FIG. 2 is an explanatory view showing a state in which an insert is set in a mold using the insert holder shown in FIG. 1 with a partial cross section.

FIG. 3 is an explanatory view showing, with a partial cross section, a state in which a concrete product in which an insert is embedded is removed from the mold using the insert holder shown in FIG. 1.

FIG. 4 is an explanatory view showing a state where the plug portion of the insert holder shown in FIG. 1 is removed from the embedded insert.

FIG. 5 is a perspective view (a) and a sectional view (b) showing an outline of an insert holder according to a second embodiment of the present invention.

6 is an explanatory view showing a state in which an insert is set in a mold using the insert holder shown in FIG. 5 with a partial cross section.

FIG. 7 is an explanatory view showing, with a partial cross section, a state in which a concrete product in which an insert is embedded is removed from the mold using the insert holder shown in FIG. 5;

FIG. 8 is a view showing a protrusion of the insert holder left on the mold.

9 is an explanatory view showing a state in which the plug portion of the insert holder shown in FIG. 5 is removed from the embedded insert.

FIG. 10 is a side view (a) and a front view (b) showing an example of a different insert holder according to the second embodiment of the present invention.

11 is an explanatory view showing a state in which the insert holder shown in FIG. 10 is attached to the insert shown in cross section and set in a mold.

FIG. 12 is a cross-sectional view showing a state in which a concrete product molded using the mold shown in FIG. 11 is released from the mold.

FIG. 13 is an explanatory view showing a state in which the plug portion is pushed into the inside of the insert embedded in the concrete product.

FIG. 14 is a perspective view (a) and a sectional view (b) showing a different example of the insert holder according to the second embodiment of the present invention.

FIG. 15 is a perspective view (a) and a sectional view (b) showing a different example of the insert holder according to the second embodiment of the present invention.

FIG. 16 is a perspective view (a) and a sectional view (b) showing an outline of an insert holder according to a third embodiment of the present invention.

FIG. 17 is an explanatory view showing a state in which the insert holder shown in FIG. 16 is attached to an insert inserted in a conventional type insert holder shown in a sectional view.

FIG. 18 is an explanatory diagram showing a state in which the insert to which the insert holder shown in FIG. 17 is attached is attached to a mold.

19 is an enlarged view showing a state where the protrusion of the insert holder shown in FIG. 18 is inserted into the setting hole of the mold.

20 is a cross-sectional view showing a state in which a concrete product having an insert embedded therein is removed from the mold by the insert holder shown in FIG.

FIG. 21 is a cross-sectional view showing how to remove the plug portion of the insert holder from the insert embedded in concrete.

FIG. 22 is a perspective view showing an outline of an insert holder according to a fourth embodiment of the present invention.

FIG. 23 is a view showing a cross section of the insert holder shown in FIG. 22.

FIG. 24 is an explanatory view showing a state where the plug part is removed from the insert embedded using the insert holder shown in FIG. 22.

FIG. 25 is a perspective view (a) and a sectional view (b) showing a modified example of the insert holder according to the fourth embodiment of the present invention.

FIG. 26 is an explanatory view showing a state of setting an insert using the insert holder shown in FIG. 25.

FIG. 27 is an explanatory view showing a state where a concrete product having an insert embedded therein is demolded by the insert holder shown in FIG. 25.

FIG. 28 is an explanatory view showing a modified example of the insert holder according to the fourth embodiment of the present invention using a partial cross section.

FIG. 29 is a side view showing a modified example of the insert holder according to the fourth embodiment of the present invention.

FIG. 30 is a perspective view (a) and a sectional view (b) showing an outline of an insert holder according to a fifth embodiment of the present invention.

FIG. 31 is an explanatory view showing a state where the insert holder shown in FIG. 30 is attached to an insert inserted in a conventional type insert holder shown in a sectional view.

32 is an explanatory diagram showing a state in which the insert to which the insert holder shown in FIG. 30 is attached is attached to a mold.

FIG. 33 is a cross-sectional view showing a state where concrete is poured into a formwork in which the insert shown in FIG. 32 is set.

FIG. 34: The concrete product shown in FIG. 33 is demolded,
It is sectional drawing which shows the state in which the protrusion is cut | disconnected at that time.

FIG. 35 is a cross-sectional view showing a state in which the mold is swung from the concrete product shown in FIG. 33 to remove the mold, and the protrusion is pulled out at that time.

FIG. 36 is a perspective view showing the outline of an insert holder according to Embodiment 6 of the present invention.

37 is a side view (a) and a front view (b) of the insert holder shown in FIG. 36. FIG.

38 is an explanatory view showing a state where the insert holder shown in FIG. 36 is attached to the insert shown in cross section and set in the mold.

FIG. 39 is a cross-sectional view showing a state where the concrete product molded using the mold shown in FIG. 38 is released from the mold.

FIG. 40 is a perspective view showing a modified example of the insert holder according to the sixth embodiment of the present invention.

41 is a sectional view showing the structure of the insert holder shown in FIG. 40. FIG.

FIG. 42 is a view showing a method for fixing a conventional insert to a mold.

FIG. 43 is an enlarged view showing a state where an insert is set using a conventional bolt.

FIG. 44 is an enlarged view showing how an insert is set using a conventional plug.

FIG. 45 is a perspective view showing the structure of a conventional plug.

[Explanation of symbols]

1, 3 ·· Formwork 2 · · Concrete products 4 · · Setting boss 5, 8 · · Setting bolts 6 · · Inserts 7 · · Setting plugs 9 · · Recesses for removing plugs 10 ·・ Insert holder 11 ・ ・ Plug part 12 ・ ・ Setting surface 13 ・ ・ Outer peripheral surface of sealing part 14 ・ ・ Sealing part of plug 15 ・ ・ Flange part of plug 16 ・ ・ Outer peripheral surface of flange part 17 ・ ・ Plug Hollow part 20 .. Projection 21 .. Center axis of projection 22 .. Rib 23 .. Tip 25 .. Connection part 26 .. Recess 30 .. Operating part 35 .. Plug part left in insert Jig for removing the parts 40 ・ ・ Form 40a ・ ・ Front of the form 40b ・ ・ Back of the form 41 ・ ・ Setting hole 45 ・ ・ Position of the insert 52 ・ ・ Upper half of the protrusion 53 ・ ・Lower half 70 ... Conventional inserter Insert according preparative holder 91 ... hexagonal nut 92 ... anchor

Claims (33)

[Claims] 1. An insert holder for mounting a hollow insert, at least one end of which is an opening, on a mold, the insert holder having a plug portion insertable into the opening of the insert, the plug portion comprising: It is characterized in that it has a substantially flat setting surface on the side facing the mold, and that a protrusion that can be mounted in a setting hole provided in the mold projects from the setting surface toward the mold. And insert holder. 2. The insert holder according to claim 1, wherein a part of the setting surface is retracted and has at least one operation part that can be operated by a jig when the plug part is removed from the insert. . 3. The insert holder according to claim 1, wherein the plug portion has a substantially tubular shape, and at least a portion opposite to the setting surface is open. 4. The insert holder according to claim 1, wherein the protrusion is made of resin. 5. The insert holder according to claim 1, wherein an outer diameter of the protrusion is smaller than an outer diameter of the plug. 6. The insert holder according to claim 1, wherein the connecting portion between the protruding portion and the plug portion can be divided by a force that acts when the mold is released from the mold. 7. The insert holder according to claim 6, wherein the cross-sectional area of the connecting portion is smaller than the cross-sectional area of the other portion of the protruding portion. 8. The insert holder according to claim 7, wherein the vicinity of the connecting portion widens toward the tip of the protrusion. 9. The insert holder according to claim 7, wherein the connecting portion has a recess. 10. The insert holder according to claim 7, wherein the connecting portion has a cut. 11. The connecting portion according to claim 7,
An insert holder characterized by having at least one streak hole penetrating substantially at right angles to the extending direction of the protrusion. 12. The groove according to claim 11, wherein at least one groove connected to the hole formed in the connecting portion is formed in the setting surface, and the groove can be operated by a jig for removing the plug portion. An insert holder characterized in that there is. 13. The insert holder according to claim 1, wherein the protrusion has a column portion that fits into the setting hole. 14. The insert holder according to claim 1, wherein the protrusion includes a column portion that is substantially elastically deformed in accordance with the setting hole. 15. The pillar portion according to claim 14,
An insert holder comprising a plurality of ribs extending in the radial direction of the column portion. 16. The protrusion according to claim 14,
An insert holder characterized in that it has a length that penetrates the mold. 17. The insert holder according to claim 1, wherein the protrusion has a column portion that comes into contact with the inside of the setting hole at at least two points. 18. The insert holder according to claim 1, wherein the protrusion has a penetrating portion that spreads after penetrating the mold. 19. The insert holder according to claim 18, wherein the penetrating portion has a substantially arrowhead shape. 20. The insert holder according to claim 18, wherein the penetrating portion has a portion that widens toward the tip of the penetrating portion. 21. The insert holder according to claim 1, wherein the insert holder has at least two protrusions, and the protrusions are arranged so as to mutually press the side surfaces of the setting hole. . 22. At least two of the protrusions according to claim 1, wherein the protrusions have a portion that penetrates the setting hole and extends to the opposite side along the back surface of the mold. An insert holder characterized by having. 23. The insert holder according to claim 1, wherein the protrusion has a tip portion that is narrowed in a non-spiral shape. 24. The insert holder according to claim 1, wherein the protrusion has a column portion that can be screwed into an internal thread formed in at least a part of the setting hole. 25. The pillar portion according to claim 24,
An insert holder comprising a plurality of ribs extending in the radial direction of the column portion. 26. The insert holder according to claim 2, wherein a part of the setting surface retreats in a step shape to form the operation portion. 27. The insert holder according to claim 2, wherein a part of the setting surface is recessed to form the operation portion. 28. The insert holder according to claim 1, wherein the outer peripheral surface of the plug portion is made of resin. 29. The insert holder according to claim 1, wherein an external thread is formed on the outer peripheral surface of the plug portion, and a part of the external thread is cut. 30. A method of manufacturing a concrete product, wherein an insert having at least one end formed as an opening is attached to a predetermined position of a mold to manufacture a concrete product in which the insert is embedded. Of the concrete product, characterized in that it is mounted on a cylindrical plug part, and a protrusion projecting from the plug part toward the mold is mounted on a setting hole pre-opened at a predetermined position of the mold. Production method. 31. The method for manufacturing a concrete product according to claim 30, wherein the projecting portion is cut from the plug portion by a force acting at the time of demolding, and the concrete product is demolded from the mold. 32. The operating part, a part of which is retracted, is formed on the setting surface of the plug part that is substantially opposite to the formwork according to claim 30, and the concrete product after the concrete product is demolded. A method for manufacturing a concrete product, characterized in that the plug part is removed from the insert embedded in the concrete product by using the operation part exposed on the surface of the concrete product. 33. A formwork capable of mounting an insert having an opening at least one end at a predetermined location, wherein a setting hole having a diameter smaller than that of the opening is provided in a region of the formwork facing the opening. The setting hole can be fitted with a protrusion protruding from a plug portion of an insert holder attached to the opening of the insert toward the mold.