JP2930940B2 - Method for manufacturing concrete products, durable formwork and buried object - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a concrete product having an embedded insert, a durable formwork suitable for the method, and an insert and an insert holder.

[0002]

2. Description of the Related Art In recent years, durable forms (hereinafter referred to as
In a secondary concrete product manufactured using a durable formwork or a formwork), many hollow inserts having internal threads or the like are embedded. In handholes used when burying electric wires in the ground, or in common trenches where gas, water, etc. can be installed, a large number of inserts should be placed at specified locations to facilitate installation of cable racks and pipe racks. It is often buried in advance.

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

In this method, a hole larger than the inner diameter of the insert for allowing the setting bolt 5 or 8 to pass therethrough is formed at the position where the opening of the insert 6 of the molds 1 and 3 is located or at the opposite side. Need to be kept. When setting the insert 6, it is necessary to operate the setting bolts 5 or 8 from the surface of the mold 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 those having a very small size. Furthermore, after concrete is poured between the outer mold frame 1 and the inner mold frame 3 and the concrete product 2 is formed, the mold cannot be removed unless the setting bolts 5 or 8 are removed.

[0005] When the concrete product 2 is to be buried in the inner surface of a square or groove such as a hand hole or a common groove, the setting bolt 5 must be removed in advance from the inner mold 3 for molding the inner surface of the concrete product 2 shown in FIG. Must. Since the hands of the worker are not accessible to the inner formwork, it is necessary to lift the formwork together with the concrete product, or to invert them and enter the inside of the inner formwork 3. In order for the concrete secondary products to be inverted with a crane together with the formwork or to be jacked up, the weight of these concrete secondary products is 2-3.
Large tonnage is required because of the tonnage. In addition, since the step of lifting such a heavy object with a crane to enter a worker therein or inverting the heavy object involves danger, many workers are required for monitoring and the like, and the load on the worker is high.

In a durable mold for mass-producing concrete products, it is important to secure the dimensional accuracy of the mold in terms of maintaining the accuracy of the concrete product after molding, and the mold is smoothly removed. It is also important for. A mold that can be removed from the concrete product by sliding the inner surface of the concrete product like the inner mold 3 cannot be removed unless it is manufactured with high precision and distortion or unevenness is prevented even during use. If a large hole is made in the formwork to set the insert, distortion and unevenness are likely to occur, and a skilled worker is required. In the case of changing the mounting position of the insert, etc., the hole made in the formwork must be closed by welding etc., but it is difficult to repair so that distortion etc. does not occur, and if repair is not possible It is necessary to construct a new formwork every time the insert burying position changes.

On the other hand, if a bolt such as the setting bolt 8 for fixing the insert to the inner mold 3 from the side of the outer mold 1 is used, the step of removing the bolt from the inner mold 3 can be avoided. . However, setting the insert using the bolt 8 is time-consuming, and requires skill to achieve the accuracy of the embedded position. Further, it is necessary to pack the mortar after removing the bolt 8, and at this time, there is a problem that a path for water permeation into the concrete product is easily generated. Further, in the case where a slightly tapered inner mold frame is adopted in consideration of removal from the mold, it is necessary to prepare a plurality of setting bolts 8 according to the position where the insert is installed.

As shown in FIG. 44, there is a method in which the insert 6 is set by using a substantially cylindrical boss 4 instead of the setting bolt 5 or 8. FIG. 45 shows the hollow plug 7 mounted on the boss 4 in an enlarged manner. In this method, the body 7
a is screwed into the opening of the insert, and the plug 7 is fitted into the boss 4, thereby mounting the insert 6 at a predetermined place where the boss 4 is attached. When the plug 7 set in this manner is detached from the boss 7 while being attached to the insert 6, the setting bolt as described above is unnecessary. When using the insert 6, a jig such as a screwdriver is inserted into a groove 9 provided on 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 inside 7 is open on the side facing the form so that the driver can reach the groove 9.
A hollow body 7 d, a male thread portion 7 b corresponding to the female thread of the insert 6, and a protruding portion 7 c for forming the groove 9 are provided.

The method of setting the insert 6 on the mold using the boss 4 and the plug 7 can save labor for removing the mold and reduce the work. This method has no problem when the insert is set on a formwork to be removed perpendicular to the surface of the concrete product, such as a base plate. However, in the case of the formwork which is turned and removed like the outer formwork 1, the boss 4
The concrete product 2 interferes with the concrete product 2 and cannot be removed from the mold. Further, when the mold is removed so as to slide the mold like the inner mold 3, the boss and the concrete product interfere with each other, so that the insert cannot be attached.

[0010]

SUMMARY OF THE INVENTION The present invention relates to a joint groove,
In the case of handholes, etc., considering the increasing number of cases where inserts are buried inside joint grooves to reduce work on site and advance work efficiently, problems with the conventional setting method as described above It is an object of the present invention to solve various problems and to provide a method for manufacturing concrete products that can meet these requirements. It is a further object of the present invention to provide a durable formwork suitable for the manufacturing method of the present invention.

That is, in the process of manufacturing a concrete product with an embedded insert, more steps and labor are required than in the case of manufacturing a concrete product without an embedded insert, and the labor of a worker is large. In the present invention, even one worker can easily and stably set the insert on the formwork, and when removing the mold, an extra step of removing the setting bolt is not required. It is an object of the present invention to provide a manufacturing method and a durable mold in which an insert can be stably set in a manufacturing method in which a mold is removed by sliding a mold, and a manufacturing method in which a mold is turned and removed. In addition, we will provide a manufacturing method that can provide concrete products with embedded inserts more easily, in a short period of time and with as little labor as possible, reducing the manufacturing cost of concrete products and shortening the delivery time. It is also intended to provide.

[0012]

Therefore, according to the manufacturing method of the present invention, when the insert or the insert holder is repeatedly set at a predetermined position of the durable formwork, at least one of the inserts or insert holders protruding from the formwork side toward the formwork side is provided. Inserting or screwing the protrusions of the book into the setting holes provided in the mold from the surface and setting them, at least part of the protrusions is broken by the force acting between the concrete product and the durable mold when the mold is released. In the method for producing a concrete product that breaks or deforms, the contact area is increased by inserting a protrusion into a setting hole provided with a sheath tube on the back surface, and the insert is stabilized by obtaining an adhesive force. You can set it. Alternatively, the protrusion is screwed into a setting hole provided with a nut portion on the back surface, so that the screwed length is increased to enhance the adhesive force.

Accordingly, in a durable form in which the insert or the insert holder can be set, the durable form having a portion to be removed so as to be slid or a portion to be swiveled and removed is provided so as to be able to slide. A setting hole through which at least one protrusion protruding from the insert or the insert holder can be inserted is formed in a part to be removed or a part to be removed by turning, and further, a protrusion is formed on the back surface of the form of the setting hole. By providing an insert or an insert holder having a protrusion having a length that can contact the sheath tube and obtain an adhesive force with respect to the durable formwork, a sheath tube that can provide an adhesive force with the insert is provided. Can be strengthened when the is set on the formwork. Therefore, when the mold is removed from the mold so as to be slid, or when the mold is pivoted and removed, at least a part of the protrusion is separated by the force or falls out of the mold. Therefore, as before,
No pre-demolding work such as removing mounting bolts is required. For this reason, it is possible to provide a concrete product in which an insert is buried in a surface which is not accessible to an operator and which is slid off the mold, such as a surface formed by the inner mold. In addition, it has a setting hole into which the protrusion can be screwed, and can be screwed to this nut portion with respect to a durable mold provided with a nut portion into which the protrusion can be screwed on the back surface of the form of the setting hole. The same effect can be obtained by setting the insert or the insert holder according to the present invention by screwing the length of the protrusion.

[0014] Therefore, it is not necessary to pass the mounting bolts from outside the formwork, and even one worker can easily set the insert on the formwork. When the mold is removed by turning or the like, at least a part of the protrusion is broken or divided by a shearing force or a pulling force at the time of removing the mold.
Furthermore, since it is deformed and comes off, the work can be performed in the same process as a concrete product without an embedded insert. Also, even if the insert is set in a place where the worker cannot access, such as the inner formwork, the projections are cut off by the shearing force at the time of demolding, so the worker cannot work inside the formwork. You don't even have to get in. For this reason, the demolding process can be simplified, and the labor of the operator can be reduced.

As the projections, those shown in the following Examples and Comparative Examples can be adopted. For example, it is desirable that the projections be such that when the next projection is mounted in the setting hole, the projection that has been separated and left in the setting hole is easily removed.
For example, if a portion extending toward the tip is provided on the projection, the projection can be easily moved to the opposite side of the form when the projection is cut, so that the remaining projection can be easily removed.

Further, a setting surface facing the durable formwork is provided, and a seal deformable according to the surface of the formwork such as a sponge is provided around the setting surface to provide a seal between the setting hole and the projection. It is also possible to reliably prevent the sluggish intrusion.

If the buried object according to the present invention is molded using a resin containing a plastic material such as ordinary plastic such as polypropylene or polyvinyl chloride, or a so-called engineering plastic such as reinforced polyethylene, the diameter and the shape of the projection are adjusted to the respective values. It can be designed to the size and shape suitable for the function. For this reason, it is possible to adopt a configuration in which the diameter of the projection can be reduced or the projection can be cut by the force acting when the mold is released.

In order to make it easy to cut the connecting portion of the projection,
It is also effective to make the cross-sectional area of the connecting portion smaller than the cross-sectional area of the projection. For example, the vicinity of the connection portion may be expanded toward the tip of the protrusion, or the connection portion may be provided with a recess or cut along the direction in which the protrusion extends, or at a right angle to the direction in which the protrusion extends. it can. Further, at least one streak hole may be provided in the connection portion at a substantially right angle to the direction in which the protrusion extends.

Further, since the projection is mounted in a setting hole previously formed in the mold, the tip does not need to be sharp, and it is sufficient if it is smoothly narrowed in a non-spiral shape. For example, a substantially semicircular or substantially hemispherical tip may be used. Since the tip is not sharp, it does not hurt the worker himself or the work clothes during the work, and can prevent the mold from being damaged. If the tip is formed to have a thinner shape, it is easier to guide the protrusion to the setting hole.

As a projection which can be attached to the setting hole, there is a projection provided with a column portion which fits into the setting hole. It is desirable that the relationship between the column portion and the setting hole be a so-called stop fit or a close fit. In consideration of the influence on the setting hole, it is desirable to use a material that is softer than the material of the formwork as the pillar portion. Since a metal such as an iron plate is often used as a durable mold, a pillar formed of a resin such as plastic can be used as the pillar.

Further, the projection may have a column portion whose cross section is substantially elastically deformed in accordance with the setting hole. For example, a shape having a plurality of ribs extending in the radial direction of the pillar portion, a crescent shape, a half moon shape, a star shape, a polygon, and the like that can contact at least two points with the inner surface of the setting hole can be adopted. With such a shape, when inserted into the setting hole, the cross section deforms according to the setting hole and presses against the inner surface of the setting hole, so it is attached to the formwork by the elastic force of the pillar part and the frictional force with the setting hole it can.

The column portion having such a shape does not need to completely elastically return to its original shape when taken out of the setting hole, and includes a case where it is accompanied by plastic deformation, without affecting the shape of the setting hole. What is necessary is just to be able to obtain the adhesive force that can set the insert to the mold. A pillar portion having a cross-sectional shape that periodically repeats the unevenness or a shape that periodically repeats the unevenness in the longitudinal direction of the protrusion may be used.

Further, the protrusion may be provided with a penetrating portion which extends after penetrating the mold. The one that presses the setting hole by the penetrating portion and the one that can obtain the adhesive force by pressing the surface opposite to the surface on which the insert of the formwork is set after the penetrating portion penetrates are included. Further, the projection may penetrate the durable formwork and be hooked on the back surface of the durable formwork.

The number of protrusions is not limited to one, but a plurality of protrusions may be provided, and by these, it is possible to obtain an adhesive force necessary for securely setting the insert on 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 projections may be provided with portions that extend through the setting holes and extend on the opposite side along the back surface of the mold, that is, outward. Each of the plurality of protrusions may be arranged so as to be inserted into a plurality of setting holes, or the plurality of protrusions may be arranged so as to be inserted into one setting hole.

Further, as the protruding portion, one having a plurality of ribs extending in the radial direction in addition to the column can be employed. If a protrusion having a shape that creates a gap with the setting hole when inserted into a setting hole such as a rib is employed, the protrusion remaining in the installation hole of the formwork cut by using this gap is removed by rotation. Work is also easy. It is also possible to make the projection hollow to facilitate cutting.

The screwable projection may be formed with a male screw in advance, or may be formed of a soft material such as resin so that the male screw can be cut when screwing. .

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

Comparative Example 1 FIG. 1 shows an outline of an insert holder according to the present invention. FIG. 2 shows that the insert 6 is formed using the insert holder 10 of this embodiment.
Is set. The insert holder 10 of the present example includes a plug portion 11 that is attached to the opening 6a of the insert 6 having a hollow inside, and a projection portion 20 that protrudes from the plug portion 11 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 projecting portion 2 extends from substantially the center of the setting surface 12.
0 is protruding. A pair of recesses 30 are formed on the setting surface 12 with the protrusions 20 interposed therebetween. As described later, a jig is inserted into these recesses 30 so that the plug portion 11 can be removed from the insert. Has become.

The plug portion 11 includes a cylindrical sealing portion 14 having an external thread formed on an outer peripheral surface 13, and a flange portion which is formed in a flange shape on the mold 40 side of the sealing portion 14 in the outer peripheral direction. The side facing the mold 40 of the flange portion 15 is the setting surface 12. The outer peripheral surface 16 of the flange portion 15 is narrowed toward the tip of the plug portion 11, that is, toward the sealing portion 14, so as not to interfere with concrete when removing the plug portion from the insert 6 buried in concrete. It has become.

The protruding portion 20 is formed by four ribs 22 each extending in the radial direction from the central axis 21. By these, a protruding portion having an outer diameter of about 5 mm and protruding about 12 mm from the setting surface 12 is formed. Have been. Each rib 22 has a connection portion 25 connected to the setting surface 12.
From the top to the tip 23, the tip 23 is formed into a rounded shape,
The tip of the projection 20 does not have an acute angle.
In the vicinity of the connection 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. In addition, the width of a portion 24a from the connection portion 25 toward the distal end 23 by approximately the thickness of the mold 40, for example, about 3.2 mm, is widened, and the back surface of the mold 40 when the protrusion 20 is inserted into the mold 40 is formed. Can be pressed. Further, the width of the ribs 22 is set so that the rear surface of the mold 40 can be pressed even at a portion 24b corresponding to a mold having a different thickness, for example, a mold having a thickness of 4.5 mm. One end is narrowed from the corresponding portion 24a toward the tip 23, and then further expanded.

With reference to FIGS. 2 to 4, a description will be given of 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 the present 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 previously opened in the mold 40. Then, the insert 6 is set on the mold 40. The projecting portion 20 has a shape in which the ribs 22 are combined in a cross shape and 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 an operator pushing by hand or tapping lightly with a hammer. As described above, the insert holder of the present embodiment allows the operator to easily mount the insert 6 from the front side 40a of the mold frame 40 without any labor. Furthermore, the tip 23 of the projection 20 of this example is rounded and thin, and the projection 20 fits naturally into the setting hole 41. This tip 2
3 is not necessary to be an acute angle because the projection may be guided to the setting hole 41 which is opened in advance, and conversely, an obtuse angle, that is, a non-angle, so as not to damage the worker or the clothes worn by the worker. It has a spire shape. When the projection 20 is inserted into the setting hole 41, the projection 20 is fitted into the setting hole 41.
Further, since the portion 24 a corresponding to the thickness of the mold 40 expands at the position passing through the setting hole 41 and presses the back side 40 b of the mold 40, the insert holder 1 is
The insert 6 is set to the mold 40 sufficiently firmly through the “0”. Therefore, after that, even if concrete is poured into the formwork 40 on which the insert 6 is set, the insert 6 does not shift from a predetermined position. After that, concrete is poured into the formwork in which the insert is set, and the concrete product 2 having a predetermined shape is formed.

FIG. 3 shows how the concrete product is removed from the mold. When the mold set for the insert 6 is an inner mold, the concrete product 2 is removed from the inner mold 40 at the time of demolding.
Together with the inner mold 40 using vibration or air pressure.
Are separated along the inner surface of the concrete product 2. At this time, the connection portion 25 between the projection 20 and the plug 11 is
It is automatically cut by the shearing force acting between the concrete product 2 and the formwork 40. Therefore, there is no need for a conventional pre-demolding operation such as removing the mounting bolt. In addition, since the connecting portion 25 is separated by the force acting at the time of demolding, no extra labor or work such as applying a new force is required. Further, since the projection 20 which has been cut and remains in the setting hole 41 can be easily removed by pressing it with a wire or the like, it does not require any trouble such as cleaning. If an insert holder is set to set an insert to be embedded in the next concrete product, the projection 20 can be pushed out of the setting hole 41 and the remaining projection 20 can be pushed out. When the connection portion 25 is slightly widened toward the tip end like the protrusion 20 of the present example, it becomes easy to push out the protrusion 20 cut from the setting hole 41.

Even when an insert is set on a mold that pivots and is released like an outer mold, the projection 20 is cut off by the force that pivots the mold. Alternatively, setting hole 4
In some cases, the protrusion 20 may simply come off from the position 1. that time,
Since the protrusion 20 is only cut off from the connection portion 25 or the rib 22 is deformed, no force acts to remove the plug portion 11 housed inside the insert. Therefore, the insert does not become an obstacle when turning the formwork or cause chipping of the concrete product, so that the insert can be set with confidence even in a place where the turning radius of the formwork is small.

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. If the jig 35 for removal is inserted into this 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. Since the protruding part 20 is cut and only the cut mark 29 is visible,
It does not become an obstacle when using the operation unit 30. If the plug portion 11 is attached to the insert 6 until immediately before use at the site, dust, moisture, and the like do not enter the insert 6, so that problems such as generation of dust and rust can be prevented beforehand. Conventionally, a cap or the like is newly attached after the mold is removed. However, such a trouble is not required if the insert holder of the present embodiment is used. When casting concrete, the plug 6 is used to insert the insert 6
Do not enter inside. As described above, the use of the insert holder 10 of the present embodiment can prevent the embedded insert from becoming unusable, and can save the trouble of cleaning with air or the like before use.

As shown in the cross section of FIG. 1B, the plug portion 11 of the insert holder of the present embodiment has a cylindrical shape opened on the side opposite to the projection 20 with respect to the setting surface 12, and has an internal shape. 17 is hollow. On the other hand, the projection 20 having the above-described shape has a smaller diameter than the plug 11 and has a setting surface 12.
From the plug portion 11 to the opposite side. For this reason, in the insert holder 10 of the present example, the projection 20 and the plug 11 can be molded from each side using the respective dies with the setting surface 12 interposed therebetween. That is, the side of the mold frame 40 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 11. Therefore,
The entire insert holder can be easily formed from a plastic material such as polyethylene or polypropylene.

The outer diameter of the plug portion 11 is often 8 to 10 mm or more in accordance with the inner diameter of the insert. When molding a plastic material, if the wall thickness is large, the cooling time is prolonged, which causes sink marks, bubbles, and the like. If the wall thickness is about 4 mm or more, distortion tends to occur due to sink marks, and it is difficult to ensure dimensional accuracy of the plug portion 11. However, if the projection 20 and the plug 11 can be formed by the setting surface 12 as in the insert holder of the present example, 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 the present example can adopt the hollow plug portion 11 having the open side opposite to the setting surface 12,
The wall thickness can be kept within a predetermined range. Therefore, it is possible to provide the plug portion 11 that can be inserted into the inside of the insert, securely hold the insert, and seal the opening of the insert.

Unless the plug 11 and the projection 20 can be formed by the setting surface 12, an opening is required on the side of the projection 20 in order to make the plug 11 hollow. Therefore, the projection must be hollow with the same diameter as the plug 11, and the shape of the projection 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 projection portion 20 can be designed separately, there is no problem even if the elongated projection portion is adopted. In addition, it is also possible to extend the plurality of protrusions 20 from the setting surface 12, so that it is not necessary to change the shape of the plug portion 11. By providing the setting surface 12 in this manner, even an insert holder having a thin protrusion as in this example or a protrusion such as a combination of ribs can be easily and inexpensively manufactured.

As shown in FIG. 2, when the insert holder 10 of this embodiment is used, a small-diameter setting hole 41 into which the protrusion 20 can be inserted is previously provided as a mold 40 for molding a concrete product. What is necessary is just to use the formwork opened in the position. Since the outer diameter of the projection 20 in this example is approximately 5 mm, the inner diameter of the setting hole 41 may be approximately 5 mm. More specifically, since it is necessary to obtain an adhesive force for holding the insert 6 on the mold frame 40 by inserting the projection 20 into the setting hole 41, the outer diameter of the projection 20 and the inner diameter of the setting hole 41 are fitted. In particular, it is desirable to select a fit or a fit.

It is preferable that the setting hole 41 formed in the formwork is as small as possible. The diameter of the setting hole 41 is desirably a size that can be naturally clogged with a concrete backing, for example, about 8 mm or less in diameter. Also, in consideration of the strength of the projection 20 and the like,
The outer diameter of the projection 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, and more preferably about 3 mm or more. 10mm diameter
Even if the degree is small, it can be closed easily without welding using a tape or the like, so that the formwork is not adversely affected. In this way, if the insert holder of the present example is used, even if the set position of the insert is changed, it is not necessary to repair the mold to generate distortion or the like. Inserts can be buried. Also, when a setting hole is initially formed in the formwork, it is easy to perform since there is little occurrence of distortion or the like.

In using the durable formwork 40, the setting holes 4
It is necessary that the protrusion 20 be deformed so as not to affect 1. The projecting portion 20 of this example has four ribs 22 combined in a cross shape so that the projecting portion 20 can be substantially elastically deformed, and is made of a plastic material that can be expected to have elasticity as a material. When the projection 20 is inserted into the setting hole 41, the portion inside the setting hole 41 undergoes some plastic deformation. However, the inner surface of the setting hole 41 is pressed, and the adhesive force for setting the insert to the mold by frictional force. Can be obtained. In addition, the portion that penetrates the setting hole 41 and comes out to the back surface 40b of the mold has a tendency to return to the original shape. Obtainable.
Further, by using the projection 20 having a cross-sectional shape that is elastically deformed, the projection 20 can be easily fitted into the setting hole 41, so that there is an advantage that the setting of the insert is easier for the operator.

The number of the protrusions 20 is not limited to one, and a plurality of protrusions may be provided. Inserts become bigger,
Depending on manufacturing conditions such as a high concrete pouring speed, a necessary adhesive force can be obtained by providing a plurality of thin projections on the insert holder.

The shape which can be employed for the projection and is substantially elastically deformed is not limited to this example. Any shape may be used as long as it can be elastically deformed along with the shape of the setting hole with some plastic deformation. For example, there are shapes such as a substantially crescent shape, a polygonal shape, a star shape, and the like that can contact two or more points with a setting hole. In addition, a projection having a shape that periodically repeats irregularities in the longitudinal direction or the circumferential direction of the projection, or a hollow cylindrical projection may be expected to be substantially elastically deformable. . Further, as long as the protrusion is made of an elastic material such as a plastic material, the protrusion 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 a circle as in the present embodiment, but may be a polygonal hole corresponding to the shape of the projection, or a hole whose shape changes in the thickness direction.

If the protrusions are substantially elastically deformed in accordance with the setting holes, the above-described effects can be obtained. Therefore, a metal such as aluminum which is softer than the metal used for 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 molded integrally with the plug portion, is inexpensive, can expect some elasticity to the material itself, and does not damage the mold.

Comparative Example 2 FIG. 5 further shows the outline of the insert holder 10 according to the present invention. The insert holder 10 of this example has a substantially cylindrical projection 20 protruding from the setting surface 12 and a plug 11 formed on the opposite side of the projection 20 from the setting surface 12. In the following, portions common to the insert holder of the present embodiment and the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

The protrusion 20 of the insert holder 10 of this embodiment
The tip 23 has a sharp corner and is smoothly narrowed toward the tip. For this reason, similarly to the first embodiment, the protrusion 20 is easily fitted into the setting hole without damaging the work clothes or the like. Four ribs 22 are provided on the outer periphery of the protrusion 20 so as to extend in a substantially triangular shape in the radial direction of the protrusion 20.
The rib 22 of the present example has a surface 22 a facing the tip of the projection 20.
Extends in the radial direction of the projection 20 from the tip 23 toward the connection portion 25, while the surface 22 b facing the connection portion 25 has the projection 2 extending from the tip 23 toward the connection portion 25.
0 in the radial direction. These surfaces 22a and 22
The vertex 22c is formed at a point substantially matching the thickness of the mold, and when the protrusion 20 is inserted into the setting hole of the mold, the vertex 22c comes out on the back side of the mold and the surface 22b Press the back of the formwork. 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 is applied to the connecting portion 25 at the time of removing the mold, the cross-sectional area of the concave portion 26 is reduced.
The projection 20 is cut off from the setting surface 12 at the portion.

The plug portion 11 of this embodiment has a cylindrical shape in which the opposite side to the projection portion 20 is opened with respect to the setting surface 12 as in the first embodiment, and the outer peripheral surface 13 shows a smooth surface made of resin. .
Therefore, if the sealing portion 14 is screwed into the insert having the female screw formed on the inner surface, the external thread 13 is cut into 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, a description will be given of how a concrete product is manufactured using the insert holder of this embodiment. In the present 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 is embedded in a concrete product.

As shown in FIG. 6, in the mold 40 of this embodiment, similarly to the first embodiment, a small diameter setting hole 41 is previously formed at a predetermined position where an insert is set. Insert holder 10
Is screwed into the nut 91 on the side opposite to the side on which the anchor 92 is mounted, and the projection 20 is inserted into the setting hole 41. The protrusion 20 has a diameter that fits into the setting hole 41, and when pushed in, the rib 2 protrudes to the side of the back surface 40b of the mold.
2 spreads and presses the formwork 40. Therefore, a high adhesive force can be obtained, and even a large insert can be reliably set on 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 by molding a foamed plastic or the like into a thin film ring shape, and has a certain degree of elasticity in the thickness direction. When the sealing material 98 is inserted between the setting surface 12 and the mold surface 40a and the insert holder 10 is mounted on the mold, no gap is generated between the setting surface 12 and the mold surface 40a, and the concrete It can prevent intrusion.

As shown in FIG. 7, in the insert holder 10 of this example, if a shearing force is applied to the connection portion 25 of the projection 20 as in the case of removing the inner mold, the projection 20 is plugged. The part 11 is separated. Therefore, there is no need to remove the insert holder 10. In this example, since the concave portion 26 is provided in the connection portion 25, the force applied at the time of releasing the mold is concentrated on this portion, and the protrusion 20 is cut. As shown in FIG. 8, the cut protruding portion can be pressed against the back surface 40b of the mold by pressing the back surface 40b of the mold with the surface 22b of the rib 22. Therefore, the divided projection 20 can be easily removed from the mold 40.

As shown in FIG. 9, after removal from the mold, a setting surface 12 appears on the surface of the concrete product, and an operation unit 30 is provided on the setting surface 12. Therefore, the operation of the operation section 30 can be easily performed, and the plug section 11 can be easily removed by rotating the plug section 11. Although an external thread is not formed on the outer peripheral surface 13 of the sealing portion 14 of the present embodiment in advance, since an external thread is formed on the outer peripheral surface 13 when the plug portion 11 is inserted into the insert 91, the plug portion 11 can be turned in the opposite direction. , Plug part 1
1 can be removed from the insert 91. Furthermore, in this example, the setting surface 12 clearly appears by the sealing material 98, and the position of the insert is easy to understand. In addition, since the concrete sling does not turn on the setting surface 12, the operation of the operation unit 30 can be performed reliably, and the movement of the plug unit 11 is not hindered by the slug, so that the removal work is easy. is there.

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

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

The protruding portion 20 of the present embodiment has an upper half portion 52 that spreads substantially conically from the tip end 23, and a lower half portion 53 that has become thinner in a columnar shape. The upper half 52 of the projection of the present example has a so-called peak-and-arrow shape, and the widened skirt portion 54 of the upper half 52 is a portion 5 connecting the upper half 52 and the lower half 53.
It is in a position retracted from 5. The length of the lower half 53 is set to be slightly longer than the thickness of the mold 40.
Connection portion 25 between lower half 53 of projection 20 and setting surface 12
In addition, a notch 56 is prepared so that the cross-sectional area of the projection is reduced.

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

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

FIG. 11 shows a state where the insert 6 is set on the mold frame 40 by using the insert holder 10 of this embodiment. When setting an insert using the insert holder 10 of the present embodiment, a mold 40 having a small-diameter setting hole 41 can be used at a position where the insert is set.
Insert holder 10 is attached to mounting side 6a of insert 6.
Is inserted, and the protrusion 20 projecting 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 is narrowed while the tip of the protrusion passes through the setting hole 41,
It spreads when it reaches b. The flared portion 54 of the expanded upper half 52 presses the back surface 40b of the mold 40, and the plug portion 1
The insert 6 is pulled to the formwork 40 through the first insert 1. Thereby, the adhesive force for setting the insert 6 to the mold 40 can be secured. If the insert is set through the insert holder using such a projection, the insert is set to the mold 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 the present embodiment has a mounting side 6a
And a flange portion 6b extending outward from the main body. Further, the internal thread portion inside the insert also starts from a position slightly retreated from the mounting side 6a. For this reason, the setting surface 12 of the insert holder 10 is directly
Is not in contact with the surface 40a of the insert holder 10
, The insert 6 is pulled toward the mold 40, and a stable state is ensured by pressing the flange 6b of the insert against the mold.

FIG. 12 shows that the insert 6 is attached to the mold by the insert holder 10 of this embodiment.
Of the embedded concrete product 2 is removed. Also in the insert holder of this example, since the force at the time of releasing the mold is concentrated on the connection portion 25 of the protrusion 20, the protrusion 20
Is cut off from the cut 26 portion. Furthermore, in this example, the lower half 53 of the projection 20 may be thinner than the setting hole 41, so that the projection 20 remaining in the mold 40 is not clogged by the lower half 53, and is more easily removed. . Note that instead of the type in which the projection is divided, the strength of the upper half portion 52 may be reduced so that the foot portion or the like may be easily broken. With such a projection, the upper half portion 52 is destroyed by the force when the mold is released, so that the projection itself is released from the plug 11.

FIG. 12 shows how the plug portion 11 of the insert holder 10 of this embodiment is removed. When removing the plug part 11 of this example, it is also possible to rotate and remove it using a removal jig 35 as shown in FIG. In addition, as shown in FIG.
May be hit with a jig such as a hammer or a stick 37. Plug part 11 molded of resin such as plastic
Since only a few threads are prepared in the sealing portion 14 of the above, hitting the plug portion 11 destroys those threads,
The plug part 11 can be pushed into the inside of the insert 6. Thus, the insert 6 can be used. Since the force required for setting the insert 6 on the mold 40 is not so large, the number of the external threads 13 provided on the plug portion 11 may be small. For this reason, the above-mentioned removal method becomes possible. Alternatively, the plug section 11 may be broken and removed by hitting the groove 31 prepared as the operation section 30 on the setting surface 12 with a driver or the like. The removal method may be determined in consideration of the installation orientation of the insert, the purpose of use of the insert, and the like.

FIGS. 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 substantially frustoconical cylindrical shape 5 that becomes thinner toward the tip.
7a, and the connecting portion 25 is a truncated cone-shaped cylinder 57b slightly tapered toward the setting surface 12. A portion 57c where these two truncated cones are combined is located at a position corresponding to the thickness of the mold frame 40, and this portion 57c is a portion of the projecting portion 20 that spreads outmost. Therefore, also in the insert holder 10 of this example,
The tip 23 of the projection 20 is gradually narrowed, and the truncated conical portion 57a that is tapered toward the tip is formed on the rear surface 4 of the mold.
When it comes to 0b, it spreads. By being pulled by this, a portion close to the portion 57c where the truncated conical portion 57b is joined presses the portion on the back side of the setting hole 41, and a large adhesive force can be secured. Further, the truncated conical portion 57b has the smallest cross-sectional area near the connection portion 25, and the protrusion 20 is cut from this portion when the mold is released.

The insert holder 10 shown in FIG. 15 has a protrusion 20 in the shape of a truncated cone converging toward the distal end on the distal end side, similar to that shown in FIG. The vicinity of the connection portion 25 of the projection 20 of this example is cylindrical, and a plurality of cuts 58 are provided in that portion along the direction in which the projection 20 extends. Therefore, the connection portion 25
Is reduced, and the protrusion 20 is smoothly divided by the force acting when the mold is released.

[Embodiment 1] An embodiment of the present invention will be described below. Insert holder 10 of the present example shown in FIG.
Is provided with a plug portion 11 to be inserted into the insert 6 and a projection portion 20 protruding from the setting surface 12 on the side of the plug portion 11 facing the mold, and the entirety is usually used such as polypropylene. It is integrally molded from plastic materials including plastics and engineering plastics such as reinforced polyethylene and glass fiber reinforced plastics. The insert holder 10 of this example is
The upper and lower two surfaces 32 in the drawing retreat in a step-like manner with the protrusion 20 of the setting surface 12 interposed therebetween, thereby forming the operation unit 30. Following the surface 32, the sealing portion 14 extends on the side opposite to the protrusion 20, and a male screw is formed on the outer peripheral surface 13. That is, a pedestal-shaped member is formed by the side surface 33 rising substantially in parallel from the surface 32 constituting the operation unit, and the setting surface 12 is provided on the formwork side. If the jig is hooked on the side surface 33 and the plug portion 11 is rotated, the plug portion 11 can be removed.

The protrusion 20 of the insert holder 10 of this embodiment
Is a bar-shaped portion 61 having a hemispherical tip 23, and 4 extending from the surface of the setting surface 12 along the bar-shaped portion 61.
It is formed from the convex portion 62 of the book. The four protrusions 62
The protrusions are evenly arranged around the bar-shaped portion 61, and each of the protrusions becomes lower in the vicinity of the tip 23, and is smoothly connected to the tip 23 of the bar-shaped portion 61. In this example,
Although the protrusion 20 having such a shape is formed integrally with the plug portion 11, 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 mounted on the insert 6. The insert 6 of the present example is inserted into a cylinder 71 of an 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 cylinder 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 mounted on the insert 6. Since the setting surface 12 of the plug portion 11 extends from the sealing portion 14 toward the formwork, it is located near the open end of the insert holder 70. Therefore, the projection 20 protrudes 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 6 is set in the formwork 40 using the insert holder 10 of this embodiment. A mold 40 for setting an insert using the insert holder 10 of the present example is provided with an inner diameter of the insert 6 and an insert holder 7 for a control panel substantially at the center of a predetermined location 45.
A setting hole 41 smaller than the inner diameter of 0 is formed, and a large hole such as a conventional durable formwork is unnecessary.

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 deformed along the hole 41, and the insert holder 10 is firmly set by obtaining an adhesive force by an elastic repulsive force at this time or a frictional force when the hole is in close contact with the hole 41. In addition, since the insert holder 10 of the present embodiment is entirely formed of a resin such as plastic, the rod-shaped portion 61 is also elastically deformed, thereby increasing the adhesive force to the mold. Further, since the protrusion 20 is longer than the thickness of the mold, the tip 23 side of the protrusion 20 that has penetrated the mold tends to expand to the original diameter. For this reason, the tip 23 pulls the plug portion 11 toward the mold, and the adhesive force of the insert holder is increased. Since a sufficient adhesive force can be obtained by such a projection 20, the diameter of the projection 20 should be smaller than the diameter of the plug 11 in order to counteract the force applied to the insert during concrete injection or subsequent vibration. May be. Also, the setting surface 12
Since the projections 20 protrude from the projections, even a projection having a small diameter can be manufactured without any problem.

In the manufacturing method using such a durable mold, the length of the projection 20 varies depending on the thickness of the plate used for the mold. .5m
Since an iron plate of m is often used, the length of the protrusion 20 may be about 6 to 15 mm. However, setting hole 4
In order to increase the contact area between the protrusion 1 and the protrusion 20, it is also possible to form a sheath tube on the back surface of the mold along the setting hole 41. In such a case, the length of the protrusion 20 is long. Become. Since the projections 20 are inserted into the setting holes 41 opened in the mold frame to obtain an adhesive force, the insert can be stably set even if the surface of the mold frame 40 is coated with oils and / or release agents. it can.

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

FIG. 20 shows a state in which the projection 20 of the insert holder 10 is cut off by the force acting when the mold is released from the mold in this example. The inner mold 40 is lifted slightly upward by a crane or the like together with the concrete product, and the inner mold 40 is dropped downward by a method such as vibration or air injection. When the form falls, a force greater than the adhesive force between the form and the concrete acts between the form and the concrete surface, and this force causes the protrusion 20 inserted into the form 40 from the plug 11. The projection 20 is cut off or comes out of the setting hole 41 of the mold 40. For this reason, if the insert is set using the insert holder according to the present embodiment, even if the concrete product has the insert embedded therein, the inner mold can be removed in the same process as the concrete product having no embedded object. . Since the insert 6 is already buried in the concrete product 2, there is no possibility that the insert 6 is damaged or the buried position is displaced by the force when the projection 20 is cut off or comes off from the formwork. .

Even when the insert holder of this embodiment is used, safe and efficient work can be performed when removing the mold. Further, the same effect as in the above embodiment can be obtained, for example, the setting hole prepared in the formwork can be small, and the setting position of the insert can be flexibly changed according to the request of the customer.

FIG. 21 shows the plug portion 11 of the insert holder.
Is shown to be removed. For example, a jig 35 having a substantially U shape may be inserted into the operation unit 30 formed on the setting surface 12, and the plug unit 11 may be rotated and removed. As a result, the insert 6 whose inner surface is kept clean appears,
The insert 6 can be used without any problem at any time. If the buried insert is not used on site, plug 11
If left unattended, the insert will not be rusted and can be kept ready for use whenever needed.

The retracted surface 3 constituting the operation unit 30
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 between the insert and the insert when the insert is removed. For example, a pedestal having a circular concave or a polygonal surface may be used.

Comparative Example 3 FIGS. 22 and 23 show an outline of an insert holder 10 according to the present invention. The insert holder 10 of the present embodiment includes a cylindrical plug portion 11 as in the first embodiment, and three protrusions 20 from the setting surface 12.
Is sticking out. The shape of each projection 20 is shown in FIG.
Since the shape is substantially the same as the protrusion of the first embodiment described based on FIG. Further, a single groove 34 is formed as the operation unit 30 substantially at the center of the setting surface 12 in this example, and the groove 34 extends substantially perpendicularly to the center axis of the insert holder. The parts common to the insert holder of the present embodiment and the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the insert holder 10 of this embodiment, a plurality of projections 20 are provided along the periphery of the setting surface 12, so that
Even if the operation unit 30 is arranged at 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 projections, the adhesive force obtained per one piece can be reduced, so that the diameter of the projection 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 projections are provided on the setting surface, even if the number of projections changes, it is not necessary to affect the shape of the plug. The operation unit 30
The shape of is not limited to one groove as in this example, and various shapes such as a cross-shaped groove and a recess for receiving a hexagon wrench can be adopted.

In the mold corresponding to the insert holder of this embodiment, three setting holes may be formed in the same arrangement as the three projections 20. The shape of each setting hole may be a small diameter corresponding to the protruding part 20, and the precision is high and the demolding is prepared.
A formwork that can also change the setting position of the insert can be used.

FIG. 24 shows a molded concrete product 2
3 shows a state in which the plug portion 11 is removed from the insert 6 embedded in the plug 6. When the insert holder 10 of the present example is used, the projection 20 is cut by the force exerted at the time of demolding.
Only a trace 29 of the cutting is left. Therefore, if the operating part 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 part 11 can be easily removed, and an insert free of dust or the like can be used.

FIG. 25 shows a different example of the insert holder according to the present embodiment. Insert holder 1 of this example
Numeral 0 denotes a setting surface 1 which is molded from a plastic material.
2, two substantially cylindrical protrusions 20 protrude. The ends of the cylindrical projections 20 of these cylindrical projections 23 are cut off so that they can be easily inserted into the setting holes. In addition, this does not hurt workers or work clothes. The connecting portion 25 of each projection 20 is provided with a recess 26 in the circumferential direction so as to reduce the cross section. When a cutting force is applied at the time of releasing the mold, the projection 20 is cut from the recess 26. ing.

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

FIG. 27 shows how a concrete product in which an insert 91 is embedded is removed using the insert holder 10 of this embodiment. In the case of the cylindrical projection 20 as in this example, the projection 20 is cut off when a force generated at the time of demolding such as a shearing force is applied to the connection portion 25, and it takes time and effort like a concrete product without embedded insert. Demolding work can be performed without using. The outer diameter of the cylindrical projection 20 of this example is suppressed to about 3 to 8 mm or about 10 mm so that the cross-sectional area of each connection portion is not increased. As a result, a circular cross section, which is likely to occur in a large-diameter projection, is prevented from being distorted or crushed in the circumferential direction, so that a smooth cutting is prevented from affecting a plug or a sealing portion. . In addition, by adopting a small-diameter projection, it is possible to adopt a cylindrical projection having no hollow portion, instead of a cylindrical shape, and to prevent the influence of distortion or collapse of the projection.

FIG. 28 shows the insert holder 10 of the present embodiment having two projections 20 having different shapes from the above. The rough shape of the projection 20 shown in FIG.
The upper half 52 expands in a tapered shape from the tip 23, while
From the upper half 52 to the lower half 53, the width gradually narrows. The protruding portion 50 includes a column 63 protruding from the setting surface 12 of the plug portion 11 toward the distal end 23, and a member 64 having a side surface extending from the upper half to the lower half as described above and connected to the column 63 at the distal end 23. And the support 63
A gap is provided between the member and the member 64. In addition, the support 63
A notch 56 is provided near the connection portion 25 of the
0 is easily cut. Since the protrusion having such a shape is formed into a shape having elasticity, a hard plastic excellent in moldability, for example, ABS resin, PPO, or the like may be used as a material. In the case where the projections are formed using a material having a higher elasticity, for example, soft PVC, it is not necessary to provide a gap as shown in FIG.

When the projection 20 of this example is inserted into the setting hole 41, the upper half 52 penetrating through the hole 41 expands, and subsequently, the portion 57 connecting from the upper half 52 to the lower half 53 also expands. Accordingly, the hole 41 and the portion 57 extending from the upper half 52 to the lower half 55 press the setting hole 41 itself from the back side 40b of the mold frame of the setting hole 41, so that the insert 6 is inserted through the plug portion 11. It can be set in the formwork 40. In addition, since the protrusion 20 is cut or pulled out of the form by the force applied during the demolding, the demolding process is performed in the same manner as the above-described embodiment in the case of the concrete secondary product in which the insert 6 is not buried. Can be adopted. In order to cut the projection 20 efficiently at the time of releasing the mold, the lower half 53 is formed in a reverse tapered shape, that is, the setting surface 12 as in some examples described above.
It is good also as a shape which becomes thinner toward.

FIG. 29 shows a different example of the insert holder according to the present embodiment. Insert holder 1 of this example
0 has two projections 20 and each projection 20
Has an elongated column 63 and a hook-like portion 66 that extends outwardly of the insert holder at its tip, and the hook-like portion 66 extends to the opposite side. The distance L1 between the columns 63 is longer than the distance L2 between the centers of the setting holes 41. When the protrusion 20 of the insert holder 10 of this example is inserted into the mold 40, the insert holder of the column 63 is inserted. 10
The surface that hits the outside of the center of
At this portion, the adhesive force due to friction can be obtained. Further, since the hook-like portions 66 penetrating the mold extend to the opposite side on the back side of the mold, the insert holder is hooked on the back side 40b of the mold by these portions 66. With these forces, the insert holder of the present example can obtain a sufficient adhesive force for setting the insert in the mold.

Note that 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 embodiment, and the hook-shaped portion 6
6 may of course extend inward. In addition, setting holes into which the plurality of protrusions can be inserted at the same time may be provided in the mold. However, from the viewpoint of reducing the diameter of the setting holes, setting holes are opened corresponding to the respective protrusions. It is desirable.

When a directional load is applied to the insert due to the concrete inflow direction or the like,
By providing a plurality of protrusions and adjusting their direction and arrangement, it is also possible to prevent the insert from tilting or coming off.

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 substantially at the center of the setting surface, so that the opposite side to the above embodiment is provided.
That is, a hollow plug portion opened on the side of the protrusion may be formed. Although the operation part may be provided inside the plug part, it is preferable to provide the operation part on the setting surface that comes out of the concrete surface in terms of operation from the surface of the concrete product.

Embodiment 2 Hereinafter, a second embodiment of the present invention will be described. FIG. 30 shows an outline of an insert holder according to the present invention. In addition, FIG.
Body 71 of insert holder 70 covering the open end of
Is used to attach the insert holder 10 of the present example. In the insert holder 10 of the present 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. For this purpose, a male screw 18 is formed on the outer peripheral portion 13 of the sealing portion 14 of the plug portion 11. In addition, a projection portion 20 protruding from the setting surface 12 and having a shape in which four ribs 22 are combined is provided, and is integrally formed from a synthetic resin such as a plastic material. Note that parts of the insert holder of the present embodiment that are common to the above-described embodiments are given the same reference numerals, and description thereof is omitted.

The external thread 18 provided on the outer peripheral surface 13 of the sealing portion 14 of this embodiment has a plurality of thread threads. That is, a region 18c in which a ridge is cut is provided between the tip 18a and the end 18b of the male screw 18. For this reason, 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, a female screw is cut inside the opening 72,
The plug section 11 can be fixed. Therefore, the opening side of the insert 6 can be sealed by the plug portion 11 attached to the insert holder 70. Further, since the ridges of the male screw 18 on the plug side are divided, the movement of the plug portion 11 is hindered by the resin portion on the inner surface of the insert holder 70 that hits the cut-out region 18c. Therefore, the insert holder is difficult to rotate and does not come off due to vibrations or the like acting during the manufacture of the concrete product.

On the other hand, the protruding portion 20 of this embodiment is composed of four ribs 22 combined at approximately 90 ° intervals.
Each rib 22 is substantially rectangular. The corner near the tip 23 of the rib 22 is cut off so that it can be easily inserted into the setting hole of the insert prepared in the mold. The outer diameter of the projection 20 formed by these four ribs 22 is smaller than the inner diameter of the insert 6 as in the above embodiment.

The projection 20 of this embodiment is a projection which can be inserted into the setting hole or can be screwed in. The following description will be made on the case of screwing in. Further, no external thread is provided in advance on the outer peripheral surface 28 of the rib 22 of this example, and the external thread is cut when screwed into the setting hole of the formwork.

FIG. 32 shows how the insert 6 is set on a durable formwork 40 made of an iron plate or the like using the insert holder 10 of this embodiment. In the mold using the insert holder of this example, a small-diameter setting hole 41 is opened substantially at the center of a predetermined position 45 for setting the insert, and a female screw 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 turned while holding it. The ribs 22 of the projections are threaded by female screws 42 on the inner surface of the setting holes 41, and the projections 20 are mounted in the setting holes 41.

When the projecting portion 20 of the insert holder of this embodiment is screwed into the setting hole 41, the setting surface 12 of the flange portion 15 hits the surface 40a of the formwork, and the screw cannot be screwed more than a certain degree. Also, when the insert holder 70 is screwed into the plug part 11, the insert holder 70 hits the flange part 15 and cannot be screwed. As described above, the flange portion 15 constitutes the setting surface 12 and functions as a stopper. In addition, since the flange portion 15 functions as a stopper, the insert holding tool 10 is rotated by holding the insert 6, and the projection 20 is screwed into the setting hole 41. Conversely, the insert holder 10 may be attached to the mold 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 female screw 42 is provided inside. Therefore, the influence on the mold is small, and it is easy to change the setting place of the insert.

As shown in FIG. 33, when the projecting portion 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 holding tool 10 of this embodiment is used. 6 can be fixed to a predetermined position of the mold 40. In the insert holder 10 of the present embodiment, by attaching the insert 6 to the formwork 40 by screwing, even if concrete is poured or vibration is applied, an adhesive force that does not separate or shift the position is obtained.

FIG. 34 shows how the mold 40 is slid off like an inner mold to release the mold. When the mold is removed, the projection 20 is sheared by the shearing force acting between the mold and the concrete product. If the insert holder 10 of this example is used, it is not necessary to loosen the bolts before removing the mold. ,
It can be removed in the same process as concrete products without inserts embedded.

The cut projections 20 remaining on the formwork 40
Can be easily removed by inserting a jig into the gap between the ribs 22 and rotating it. 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 broken, and the protrusion 2
0 can be discharged.

FIG. 35 shows how the outer mold frame and the mold frame 40 employed when there is a space inside the mold frame are turned to remove the mold. When the mold is removed in this manner, a pulling force is applied to the protrusion 20. When the male screw formed on the outer peripheral surface 28 of the rib 22 is broken by the pulling force, the protrusion 20 is pulled out from the setting hole 41 of the mold 40 together with the plug 11 fixed to the insert 6. And when you need great adhesion,
A nut or the like is welded to the back surface 40b of the mold to enhance the adhesive force. In the case where the protrusion 20 is screwed to the mold frame for a long distance, the protrusion 20 may be cut off by the pulling force at the time of removing the mold, as in FIG. 34. In this way, even when the formwork is turned and removed, the work can be performed in the same process as a concrete product without embedded inserts. After the mold is removed, the jig 35 having a substantially U shape is applied to the operation unit 30 formed on the setting surface 12 to rotate the plug unit 11.
Inserts can be used.

Note that the protrusion of 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, a male screw may be formed on the outer peripheral surface of the rib in advance. In order to facilitate cutting, a notch may be provided at the boundary between the projection and the surface of the flange so as to reduce the cross-sectional area of the projection.

Comparative Example 4 FIG. 36 shows an insert holder 10 according to the present invention. FIG. 37 (a) shows a side view of the insert holder 10 of this embodiment, and FIG. 37 (b) shows this embodiment. Of the insert holder 10 of FIG. The insert holder 10 of this embodiment is an integrally molded product made of a resin such as plastic, and has a plug portion 11 that can be screwed into the opening side of the insert, a setting surface 12 that spreads to the formwork side,
The projection 20 has a projection 20 protruding from the setting surface 12. Note that portions of the insert holder of the present embodiment that are common to the above-described embodiments are given the same reference numerals, and description thereof is omitted.

The plug portion 11 of this embodiment is of a type that is directly inserted into the inside of the insert 6, and a male screw matching the female screw prepared inside the insert 6 is formed on the outer peripheral surface 13 of the plug portion 11. It is. In addition, the projection 20 of this example is a column having a smaller diameter than the plug 11, and its tip is slightly angled so that it can be easily inserted into a setting hole prepared in the mold. On the outer peripheral surface 28 of the projection 20, a male screw matching the female screw formed in the setting hole is formed, and a connecting portion 25 between the projection 20 and the setting surface 12 is provided in a direction in which the projection 20 extends. A hole 68 that penetrates through the projection 20 perpendicularly to the projection is provided. The hole 68 is provided to reduce the cross-sectional area of the connection 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 hole 68 traversing the protrusion 20, and when the protrusion 20 is cut, a single groove 34 is operated on the setting surface 12. It appears as part 30.

As shown in FIG. 38, the insert holder 10 of this embodiment is
When the screw is screwed into the opening of the insert 6, the plug 11 can be mounted inside the insert 6, and the opening of the insert 6 can be sealed by the plug 11. Since the outer diameter of the projection 20 of this example can be reduced without being influenced by the diameter of the plug 11, the projection 20 is formed in a cylindrical shape having no hollow portion inside. If the outer diameter of the projection is small, the cross-sectional area of the portion to be cut can be reduced without using a hollow projection, so a columnar projection that is easy to manufacture is adopted. If small-diameter cylindrical projections or thick projections are created by reducing the diameter even if there is space inside, the circumference of the projections will be dented or distorted due to the shearing force that acts during demolding. And the protrusions are cut smoothly.

FIG. 39 shows a state in which the projection 20 has been cut off from the plug 11 when the mold is removed. When a shearing force is applied at the time of demolding, the projection 20 is separated from the plug 11, and the setting surface 12 appears on the surface of the concrete product. Then, the cut mark of the projection 20 is formed by the groove 3 as an operation unit.
Because it overlaps with 4, insert a jig such as a screwdriver,
The plug 11 can be easily removed.

FIGS. 40 and 41 show a modification of the insert holder according to the present embodiment. This insert holder 10 has substantially the same configuration as that described above, but no external thread is formed on the outer peripheral surface 13 of the plug portion 11 and the outer peripheral surface 28 of the projection portion 20, and a smooth surface made of resin is used. Is appearing. Further, the inside of the plug portion 11 is formed as a hollow 17 opened on the opposite side to the setting surface 12 in the same manner as in the above-described embodiment, thereby reducing the amount of resin necessary for molding and preventing sink and distortion during molding. doing.

Since the plug portion 11 of this embodiment is made of resin,
By screwing 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 with the opening side sealed. Also, when the protrusion 20 is screwed into the setting hole 41 provided with the female screw, a male screw is formed on the outer peripheral surface 28 of the protrusion 20, and a sufficient adhesive force for setting the insert 6 to the mold can be obtained. .

[0104]

As described above, according to the present invention, in a manufacturing method or a durable mold in which a projection is inserted into a setting hole, in a durable mold, a sheath tube is attached to the back surface of the mold along the setting hole. By providing, it is possible to increase the contact area between the setting hole and the projection, and a large adhesive force can be obtained by inserting the projection into the setting hole opened in the mold, so that the surface of the mold has a grease, The insert can be set stably even when a mold release agent is applied, and when the mold is slid off and removed, or when it is rotated and removed, the force cuts the projection, or the mold is Get out of. For this reason, it can be manufactured in the same process as a concrete product having no embedded insert. Furthermore, even in a manufacturing method or a mold in which the projection is set by screwing into the setting hole, when a large adhesive force is required, a nut or the like is welded to the back surface of the mold to enhance the adhesive force. And a similar effect can be obtained.

Therefore, in the method for manufacturing a concrete product and the durable formwork of the present invention, there is no need to attach or remove a jig such as a setting bolt to or from the formwork. The insert can be stably set at a predetermined position on the mold in a short time. Then, when removing the mold, the protrusions are cut off or come off from the mold by the force relating to the removal of the mold, so that the work can be performed in the same process as the concrete product without the embedded insert. For this reason, it is possible to omit a conventional dangerous process of lifting and inverting the concrete product and the formwork together and removing the screws for fixing the insert from below the jack-up, thereby saving labor. Also, in the formwork that is turned and removed, the chipping does not occur even when the insert is mounted in a place where the turning radius is small.

As described above, by adopting the concrete product manufacturing method or the durable formwork according to the present invention, the labor of the worker can be reduced, and the concrete product manufacturing period and cost can be reduced. Therefore, the insert holder of the present invention is suitable for increasing the production of prefabricated concrete products and supplying large-sized and high-performance concrete products.

[Brief description of the drawings]

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

FIG. 2 is an explanatory view showing, using a partial cross section, how an insert is set on a mold using the insert holder shown in FIG. 1;

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

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

FIG. 5 is a perspective view (a) and a cross-sectional view (b) showing an outline of an insert holder according to Comparative Example 2 of the present invention.

FIG. 6 is an explanatory view showing, using a partial cross section, how an insert is set on a mold using the insert holder shown in FIG. 5;

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

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

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

FIG. 10 is a side view (a) and a front view (b) showing an example of a different insert holder of Comparative Example 2 of the present invention.

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

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

FIG. 13 is an explanatory diagram showing a state where a plug portion is pushed into an insert embedded in a concrete product.

14A and 14B are a perspective view and a cross-sectional view illustrating a different example of the insert holder according to Comparative Example 2 of the present invention.

FIGS. 15A and 15B are a perspective view and a sectional view showing a different example of the insert holder according to Comparative Example 2 of the present invention.

FIG. 16 is a perspective view (a) and a cross-sectional view (b) showing an outline of the insert holder according to the first 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 into a conventional type insert holder shown in a sectional view.

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

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

20 is a cross-sectional view showing a state in which a concrete product in which an insert is buried is removed by the insert holder shown in FIG.

FIG. 21 is a cross-sectional view showing a state where a plug portion of an insert holder is removed from an insert buried in concrete.

FIG. 22 is a perspective view illustrating an outline of an insert holder according to Comparative Example 3 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 a plug portion is removed from an insert buried using the insert holder shown in FIG. 22;

FIG. 25 is a perspective view (a) and a cross-sectional view (b) showing a modification of the insert holder according to Comparative Example 3 of the present invention.

FIG. 26 is an explanatory view showing how to set an insert using the insert holder shown in FIG. 25.

FIG. 27 is an explanatory view showing a state in which a concrete product in which an insert is embedded is removed by the insert holder shown in FIG. 25;

FIG. 28 is an explanatory view showing a modified example of the insert holder according to Comparative Example 3 of the present invention, using a partial cross section.

FIG. 29 is a side view showing a modification of the insert holder according to Comparative Example 3 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 second embodiment of the present invention.

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

FIG. 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 on which the insert shown in FIG. 32 is set.

34. Demold the concrete product shown in FIG. 33,
It is sectional drawing which shows the state in which the projection is cut at that time.

FIG. 35 is a cross-sectional view showing a state in which the formwork is turned from the concrete product shown in FIG. 33 and removed, and the projection is pulled out at that time.

FIG. 36 is a perspective view schematically showing an insert holder according to Comparative Example 4 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 in which the insert holder shown in FIG. 36 is attached to an insert shown in cross section and set on a mold.

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

FIG. 40 is a perspective view showing a modification of the insert holder according to Comparative Example 4 of the present invention.

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

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

FIG. 43 is an enlarged view showing how to set an insert using a conventional bolt.

FIG. 44 is an enlarged view showing how to set an insert 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, Boss for setting 5, 8, Bolt for setting 6, Insert 7, Plug for setting 9, Depression for removing plug 10,・ Insert holder 11 ・ ・ Plug part 12 ・ ・ Setting surface 13 ・ ・ Peripheral surface of sealing part 14 ・ ・ Plug sealing part 15 ・ ・ Plug flange part 16 ・ ・ Peripheral surface of flange part 17 ・ ・ Plug Hollow part 20. Projecting part 21. Central axis of projecting part 22. Rib 23. Tip 25 .. Connection part 26 .. Depression 30 .. Operation part 35 .. Plug part remaining in insert Jig 40 for removing the mold 40a ... the front of the mold 40b ... the back of the mold 41 ... the setting hole 45 ... the position to insert the insert 52 ... the upper half of the projection 53 ... Lower half 70 .. Conventional type of inserter Insert according preparative holder 91 ... hexagonal nut 92 ... anchor

Claims (23)

(57) [Claims] 1. When an insert or an insert holder is repeatedly set at a predetermined position of a durable form, at least one protrusion protruding from the durable form side is provided on a back surface of a sheath tube. At least one part of the projection is broken, cut or deformed by a force acting between the concrete product and the durable form when the mold is removed from the surface by setting the hole in the setting hole of the durable form. A method for producing a concrete product, characterized in that: 2. When the insert or the insert holder is repeatedly set at a predetermined position of the durable formwork, at least one projection protruding from the durable formwork side is provided with a nut on the back surface. A method for manufacturing a concrete product, characterized in that at least a part of the projection is broken or broken by a force acting between the concrete product and the durable form when the screw is screwed into the set hole from the surface and demolded. . 3. A insert or configurable durable mold repeatedly insert holder in place, smooth
Parts to be removed or swivel to remove
Having a part that demolds or swivels to make them slip
The insert or insert
At least one protrusion protruding from the holder can be inserted
It is formed Do setting hole, further, durability mold, characterized in that the sheath tube adhesion is obtained between the projections on the back surface of the setting hole. 4. A insert or configurable durable mold repeatedly insert holder in place, smooth
Parts to be removed or swivel to remove
Having a part that demolds or swivels to make them slip
The insert or insert
Screw in at least one protrusion protruding from the holder
A durable formwork, wherein a possible setting hole is formed, and a nut portion into which the projection is screwed is provided on the back surface of the setting hole. 5. A buried object in which at least one protrusion protrudes from an insert or an insert holder to a durable formwork and can be inserted into a setting hole provided in the durable formwork. The portion is provided with a length that makes contact with a sheath tube provided on the back surface of the setting hole to obtain an adhesive force,
At least one part is destroyed by the force acting when removing the mold,
A buried object characterized by being separable or deformable. 6. A buried object which is directed from an insert or an insert holder to a durable formwork, and has at least one protrusion which can be screwed into a setting hole provided in the durable formwork. The portion has a length that can be screwed to a nut portion provided on the back surface of the setting hole,
A buried object characterized in that at least a part of the buried object can be broken or broken by a force acting when the mold is released. 7. The buried object according to claim 5, wherein the projection part, which is divided when the next projection part is inserted into the setting hole, is pushed out from the setting hole. . 8. The buried object according to claim 5, wherein the protrusion has a portion that expands toward the tip. 9. The durable form according to claim 5, further comprising a setting surface facing the durable form, and a seal that is deformable around the setting surface to match the surface of the durable form. A buried object characterized by the following. 10. The embedded object according to claim 5, wherein the protrusion is made of resin. 11. The embedded object according to claim 5, wherein a cross-sectional area of a connecting portion between the protrusion and the insert or the insert holder is smaller than a cross-sectional area of the protrusion. 12. The buried object according to claim 5, wherein the protrusion has a column portion that is substantially elastically deformed in accordance with the setting hole. 13. The embedded object according to claim 5, wherein the protrusion has a plurality of ribs extending in a radial direction. 14. The buried object according to claim 5, wherein a tip of the protrusion is tapered in a non-spiral shape. 15. The buried object according to claim 5, wherein the projection has a pillar portion that fits into the setting hole. 16. The buried object according to claim 5, wherein the protrusion has a penetrating portion that extends after penetrating the durable formwork. 17. The embedded object according to claim 5, wherein the protrusion penetrates the durable formwork and is hooked on a back surface of the durable formwork. 18. The method according to claim 5, further comprising at least two protrusions, wherein the protrusions extend through the setting holes and extend outward along the back surface of the durable formwork. A buried object characterized by being. 19. The embedded object according to claim 5, wherein the protrusion is hollow. 20. The embedded object according to claim 6, wherein the projection is formed with a male screw to be screwed. 21. The embedded object according to claim 6, wherein an external thread is cut when the projection is screwed. 22. A concrete product in which the buried object according to claim 5 or 6 is buried, wherein at least a part of the protrusion is broken or divided. 23. The buried object according to claim 22,
A concrete product buried in a surface removed from the mold so as to slide the durable formwork.