JP2000254908A - Concrete embedded article, holder for mounting, form and production of concrete product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a concrete embedded article such as an insert holding tool which can be mounted surely, in a short time and in a form without being influenced by decrease in atmospheric temp. SOLUTION: A projection 25 being a key is provided on a mounting part 22 projected from the main body 21 of an insert holding tool 20 and a key channel 35 is provided in a through-hole 32 of a holder 30 for mounting into which the mounting part 22 is inserted. In addition, by combining the key 25 with the holding tool 20, the insert holding tool 20 can be mounted in a form 1. It is possible thereby to eliminate an elastically deformable part when it is mounted and to mount the insert mounting tool 20 to the form 1 in a short time only by revolving it by an appropriate angle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete buried object mounted on a mold such as an insert or an insert holder and buried in a concrete product, a holder or boss for mounting, a mold and a method of manufacturing a concrete product. Things.

[0002]

2. Description of the Related Art Conventionally, when an insert having a female screw formed therein is embedded in a concrete product, the insert is attached to a form by bolts, and then concrete is poured into the form to form a concrete product. Then, the bolt is removed from the mold and the insert is removed from the mold, and then the mold is removed. However, such a method is troublesome because it is necessary to tighten and remove bolts when mounting the insert on the mold and removing the insert. In particular, when installing the insert, it is necessary to hold the insert inside the formwork and tighten the bolts from the outside. At the same time, a large concrete product cannot be dealt with by one worker. Since a large number of inserts are buried in common grooves commonly used for power cables, telephone cables, and the like, such a method increases the manufacturing period and increases the cost. Further, when the insert is buried facing inward, it is necessary to enter the inside of the inner mold and remove the bolt, which is more troublesome.

On the other hand, as an insert or an insert holder which can be attached to a mold while holding the insert, a concrete buried object having a projection which can be attached to a hole provided in the mold in advance has recently been used. It is supposed to be. In the case of such an insert or insert holder, a projection may be pushed into a mounting hole when mounting on a mold. Further, when the mold is removed, the projection can be automatically cut off from the insert or the like by the force at that time. Therefore, by adopting a concrete buried object having such projections, the work of tightening and removing bolts becomes unnecessary,
It is possible to manufacture a concrete product in which an insert is buried in a very short time without any trouble.

[0004]

A concrete buried object having such projections, especially the projections and the vicinity thereof, is made of an elastic plastic so that it can be pushed into the mounting hole. On the other hand, once it has been inserted into the mounting holes, it must be removed so that it does not come off due to shock or vibration when the concrete is poured into the formwork, and the projections are cut smoothly by the force when removing the mold. Hardness is also required. Further, since the rigidity of the plastic has a large temperature dependency, it is difficult to be deformed at a low temperature and the plastic is easily broken. Therefore, in winter or the like, a force for pushing into the mounting hole is required, or the projection may be broken when pushed. On the other hand, if a soft material or shape is selected, it tends to come off when the temperature is high, so that the reliability is reduced.

[0005] Therefore, there is a demand for a concrete buried object which can be easily mounted regardless of the temperature, and which has a projection which is hard to come off by an impact at the time of pouring the concrete. The insert shown in FIG. 13 is an example considered for that purpose. FIG. 13A shows insert 1
0, the protrusion 90 protrudes from the main body 12 having a hollow interior and the female screw 11 formed toward the mold 1, and the protrusion 90 is provided in the mold 1 with a mounting hole 9. The insert 10 can be attached to the formwork 1 by inserting the insert 10 into the mold 1. In this example, a slit 91 is cut in the projection 90 vertically (in the axial direction of the insert main body), and an arrowhead-shaped portion 93 with a rib 92 on the outside is easily bent inward.

Therefore, even if the temperature is lowered, as shown in FIG. 13B showing the insert 10 using a cross section, the portion 93 with the rib 92 is easily deformed inward,
As shown in FIG. 13 (c), it spreads on the back surface 1 a of the mold 1. For this reason, the ribs 92 are caught on the back surface 1a of the mold 1 so that the ribs 92 do not easily come off, and the insert 10 can be stably mounted on the mold 1. When the mold is removed, a shearing force is applied along the formwork 10, so that the protrusion 90 is cut from the main body 12, and the concrete product in which the main body 12 is embedded is released. The method of mounting the insert 90 on the mold 1 using the protrusion 90 and cutting the protrusion 90 when removing the mold is performed by embedding an insert having a hollow inside and incorporating a screw or other coupling means or an insert holder for holding the insert. The present invention is not limited to this case, and can be applied to a case where other buried objects, for example, a wiring box or the like are buried.

As described above, the protrusion 9 having the structure shown in FIG.
0 is easy to use even at low temperatures. However, when the temperature drops, the ribs 92 are hardly deformed, so that it is not possible to completely solve the problem that the ribs 92 are not easily broken or pushed. Conversely, since the ribs 92 are easily deformed, the adhesive force to the mold is likely to be insufficient. In particular, when the insert main body 12 becomes large, concrete is poured or impact due to vibration increases, so that the projection 90 is easily detached.

On the other hand, by using a screw for the portion to be attached to the mold, it is possible to eliminate a portion that is elastically deformed and to obtain a sufficient adhesive force. However, the use of screws is troublesome because the insert must be rotated many times when mounted on the formwork.
In particular, in recent concrete products such as communal trenches, there are cases where a huge number of inserts, such as hundreds to thousands, are buried in a single product. Cost is affected.

When the insert 15 is attached to the mold frame 1 using the insert holder 80 shown in FIGS. 14 and 15, similarly to the above, the hardness of the plastic greatly depends on the temperature, and the elasticity is affected. The concrete buried object 80 shown in FIG. 14 is an insert holder for setting the form by fitting the tip of the metal insert 15 as shown in FIG. 15, and has a substantially cylindrical shape with both ends open. One end is a holding side 81 into which a cylindrical insert can be inserted, and the other end is a mounting side 82 for mounting an insert holder on a mold. The mounting side 82 is the holding side 8
A cylindrical outer tube portion 83 that constitutes the outside of the insert holder 80 continuously with the outside of the insert holder 80, and an inner tube portion 85 that serves as a mounting portion inside the outside. The inner cylindrical portion 85 has a cylindrical shape formed continuously with a stop portion 84 that holds the tip of the insert 15 formed inside the insert holder 80 and a gap 86 is formed between the inner cylindrical portion 85 and the outer cylindrical portion 83. As shown in FIG.
It has a smaller diameter. Further, a groove for setting the insert holder 80 in the mold 1 by engaging with a projection of a boss 70 attached to the mold 1 near the tip 85b on the inner peripheral surface 85a near the inner cylinder portion 85. 87 are provided.

The boss 70 is a setting tool for setting the insert 15 to the mold 1 via the insert holder 80. The boss 70 has a thin disk-shaped boss body 71 made of metal and extends from one end thereof. Bolt 72 is provided. Bolt 7
Numeral 2 is smaller in diameter than the boss main body 71, so that the boss main body 71 can be fixed to a predetermined place of the mold 1 with a nut 74 through a small-diameter hole 73 provided in the mold 1 in advance. A single protrusion 75 is provided along the outer periphery of the boss main body 71, and the protrusion 75 is provided on the inner cylindrical portion 85 of the insert holder 80.
With the groove 87 of FIG. The protrusion 75 is provided near the edge of the boss body 71, and the protrusion 75 and the mold 1
Is a position slightly shorter than the distance L2 between the groove 87 of the inner cylinder of the insert holder 80 and the tip of the outer cylinder 83. By making the distance L1 on the boss side shorter than the distance L2 on the insert holder side in this way,
When the insert holder 80 is set on the boss 70 and the groove 87 of the insert holder engages with the projection 75 of the boss,
Due to the difference between these distances, the distal end 83a of the outer cylindrical portion 83 becomes a surface that comes into contact with the inner surface of the mold 1 and is strongly pressed. As a result, the insert holder 80 is less likely to come off, and it is possible to prevent concrete or slack from entering the gap 86 between the inner cylinder 85 and the outer cylinder 83.
Therefore, when the mold 1 is turned and removed, the inner cylinder 85 is deformed into the outer gap 86, and the mold can be removed without causing chipping on the concrete product side.

When the insert holder 80 is mounted on the boss 70, the mounting portion 82 of the insert holder 80 only needs to be pushed into or knocked into the boss 70, and the insert can be set in a mold frame very easily. On the other hand, when removing the formwork, since the gap 86 is secured around the inner cylinder 85, even if the boss 70 is inclined with respect to the insert holder 80, the concrete product is easily damaged without being damaged. The mold 1 can be removed. Therefore,
Insert 1 even for formwork that turns and removes the outer frame
5 can be attached and removed as it is. For this reason, the mounting of the insert is simplified, and the concrete product in which the insert is buried can be removed in the same manner as the concrete product in which the insert is not buried, so that it has recently been widely used as an insert suitable for labor saving.

The insert holder 80 is also formed of plastic because it is desirable that the inner cylinder 85 be deformed when it is fitted to the boss 70 or when it is subsequently removed from the mold. Then, since it is necessary to firmly hold the insert 15 in a state of being fitted to the boss 70, a certain degree of hardness or rigidity is required. On the other hand, when fitted into the boss 70, at least the vicinity of the groove 87 of the inner cylinder 85 needs to be soft enough to be elastically deformed. Such a condition
This can be realized by setting an appropriate thickness in consideration of the elasticity of the plastic material for molding the insert holder. However, the insert 10 described above
Similarly, in winter, especially in cold regions, the elasticity of the plastic changes greatly, so that the rigidity or hardness becomes too high, making it extremely difficult to mount the boss 50 when it is fitted. Alternatively, when the attachment is forcibly attached, the inner cylinder portion 8 which is the attachment portion
5 may be cracked. Conversely, if the design is made in consideration of the low temperature condition, the insert is likely to come off except during the winter season, and there is a problem that the stick leaks into the gap 86 and the effect of the insert holder cannot be obtained. Therefore,
In the case of inserts or insert holders of the type to be mounted on the boss, and even concrete buried objects other than the inserts, those which are not easily affected by temperature, as in the case of the inserts inserted into the mounting holes, are demanded.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a concrete buried object which can be easily installed regardless of the temperature, and which can be surely installed in a short time. Furthermore, even large-sized concrete buried objects such as large-diameter inserts are hard to come off once mounted on the formwork, and are highly reliable concrete buried objects when burying, and holders, forms, and the like for mounting buried objects. It is intended to provide a method for producing a concrete product.

[0014]

For this reason, in the present invention, a concrete buried object is mounted on a formwork by a combination of a key and a key groove which cannot be removed when turning after fitting. That is, the concrete buried object of the present invention, the main body buried in the concrete product,
It is characterized by having a mounting portion provided with a key or a key groove in which the main body is not removed from the mounting hole or the boss when it is turned together with a mounting hole or a mounting boss provided in a mold for manufacturing the concrete product. And

[0015] The concrete buried object of the present invention can be fitted to a mounting hole or a mounting boss provided in the form by inserting or covering the same, and the concrete buried object can be swung with respect to the form so that the concrete buried object does not come off. By combining the key and the key groove with the mold, it can be mounted on the form in an extremely short time. Furthermore, since the mounting portion of the concrete buried object of the present invention does not require a portion that is elastically deformed at the time of mounting, it is difficult to insert the mounting portion into the mounting hole when matching due to a change in temperature, or the mounting portion has a boss. No troubles such as the cover being hard to cover and the mounting portion being broken or broken at that time do not occur. In addition, the concrete buried object is firmly fixed to the formwork by the combination of the key and the key groove, and a high adhesive force enough to hold a large concrete buried object can be obtained. And, since the adhesive force is not obtained by a structure or a method having a high temperature dependency such as fitting or elastic deformation, it is possible to obtain a stable adhesive force even when the temperature changes, and when attaching to a mold, A highly reliable concrete buried object can be provided.

Therefore, after the concrete buried object is mounted on the formwork, the concrete product is formed by the step of pouring the concrete into the formwork, so that even if the object is a large buried object, the insert or the like can be surely inserted into a predetermined place. The buried concrete product can be reliably manufactured and provided regardless of region or season.

In the case of a concrete buried object projecting from the main body so that the mounting portion can be inserted into the mounting hole, the vicinity of the boundary between the mounting portion and the main body can be separated by a force when the concrete product is released from the mold. Is desirable. With this concrete buried object, the mounting part protruding from the main body can be automatically cut when the concrete product is removed from the formwork. You can easily remove the mold without applying. Furthermore, an embedded object such as an insert can be easily embedded in the inner surface of a box-type concrete product. Further, as a holder for mounting such a concrete buried object, a key or a key groove which can be inserted into a mounting portion protruding from the main body of the concrete buried object buried in the concrete product and which does not come off when the concrete buried object is turned thereafter is provided. By providing an object having a mounting hole, and mounting the embedded object mounting holder to the formwork, it is possible to reliably mount the concrete object to the formwork.

In the concrete buried object disposed on the side of the body facing the form so that the mounting portion is covered by the boss, a space in which the mounting portion is deformed when the concrete product is removed from the mounting portion is provided. It is desirable to form around. In the case of this concrete buried object, the mounting portion is covered, and then a boss having a key or a keyed key groove that does not come off when the concrete buried object is turned is attached as a setting tool to a desired position of the formwork. Concrete buried objects such as inserts or insert holders can be set on the formwork. Then, when removing the concrete product, the concrete buried object can be attached to a desired position even by the production form or the production method in which the boss is inclined so that the boss is inclined with respect to the mounting portion. It can be removed without raising it.

In the present invention, the combination of the key and the key groove is not released by providing a stopper for preventing the concrete buried object from turning in any direction at a position where the concrete buried object cannot be swung and cannot be pulled out. . Therefore, since the concrete buried object is hard to come off, the reliability can be improved. Such a stopper can be configured with small irregularities or the like that fit into the keyway when rotated. The stopper may be provided on any of the concrete buried object, the mounting holder, and the mounting boss.

Further, it is preferable that the concrete buried object be provided with a contact surface which is in contact with the inner surface when the concrete buried object is mounted on the formwork so that the concrete buried object can be buried in the formwork in a stable posture. Then, by making this contact surface extend outside the outermost periphery of the mounting portion, concrete or concrete slack is placed in a mounting hole of the formwork or a gap covering the outside of the mounting portion when concrete is poured. ) Can be prevented from entering.

Further, if the mounting portion is protruding,
The thinner end is easier to insert into the mounting hole.
Further, the mounting portion may be of a columnar shape, a prismatic shape, or the like. However, as the size of the concrete buried object increases, the diameter of the mounting portion also increases in order to obtain a large adhesive force. It is desirable to provide. Further, the mounting portion to be combined with the boss can be configured by providing a key or a key groove inside the cylindrical portion, and a gap for deforming the mounting portion can be provided outside the cylindrical portion.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a state in which the insert 15 is mounted on the insert holder 20 and is mounted in a mounting hole provided in the mold 1. In this example,
A mounting holder 30 is attached to the back surface 1a side of the opening 8 of the mold 1 by welding or the like. The holder 30 is provided with a through-hole 32 serving as a mounting hole.
A key groove 35 is formed in the through hole 32. Therefore, by combining the keys 25 of the mounting portion 22 protruding from the main body 21 of the insert holder 20, even if the insert 15 is made of a different material such as metal, the insert holder 20 holding the insert 15 can be formed in the form 1 Can be attached to

The insert holder 20 of the present embodiment will be further described with reference to FIGS. 2A and 2B show the appearance of the insert holder 20, wherein FIG. 2A is a front view (the same applies to the rear view), and FIG. 2B is a right side view (the same applies to the left side view). 2 (c) is a plan view and FIG.
(D) is a bottom view. FIG. 3 is a longitudinal section of the insert holder 20. Insert holder 20 of this example
Is molded entirely of plastic, and as can be seen from these figures, a cylindrical main body 21 having an opening 23 at the upper side 29a so that the insert 15 can be fitted therein, and a side opposite to the opening 23 from the main body 21. (A lower part 29b). The main body 21 is a portion embedded in the concrete product while holding the insert 15.

The upper and lower ends of the main body 21 are provided with disk-shaped flanges 24a and 24b which are widened in the outer peripheral direction.
The upper flange portion 24a has a function of reinforcing the opening 23 and a function of opposing a pulling force that is exerted when the concrete product is buried in a concrete product, such as when the mold is removed. On the other hand, in addition to the function of reinforcing the main body 21, the lower surface 24 c of the lower flange 24 b contacts the surface 1 b of the mold 1 when the insert holder 20 is mounted on the mold 1, It has a function of stabilizing the insert holder 20 in a posture substantially perpendicular to the mold 1. Also, this contact surface 24c is
2, the through hole 32 of the holder, which becomes a mounting hole when mounted on the mold 1, can be completely covered with the contact surface 24c. Therefore,
When the concrete is poured, the concrete itself or the slug can be prevented from entering the mounting hole.

In the insert holder 20 of this embodiment, the main body 2
On the side where the first mounting portion 22 is attached, a portion connected to the hollow portion inside the main body 21 is a thin plastic sealing portion 24d such as a flange 24b. Therefore,
When the mounting portion 22 is divided and the sealing portion 24d comes out on the surface of the concrete product, the inside of the main body and the insert 15 are removed.
Is a state protected from dirt or the like by the seal portion 24d, and the insert 15 can be used by breaking the seal portion 24d when used. Of course, the sealing part 24
It is also possible that the insert 15 can be used immediately after the mounting portion 22 is cut without providing the d.

The mounting portion 22 of this embodiment is a cylindrical portion having a diameter substantially the same as that of the main body 21 and protruding from substantially the center of the lower flange portion 24b of the main body 21. Of course, the diameter of the mounting portion 22 is
It is determined by the adhesive strength and the like.
The diameter may be smaller, or may be larger than the main body 21.

The distal end 26 of the mounting portion 22 is processed to be slightly thinner toward the center so that it can be easily inserted into the mounting hole 32. Further, a set of projections 25 protruding in the outer peripheral direction at an axially symmetric position (a position of 180 degrees) is provided at a tip end 26 of the mounting portion 22, and cooperates with a key groove 35 provided in the mounting holder 30. Acts as a key. In this example, the projection 25 has a substantially rectangular parallelepiped shape sized to be inserted along the key groove 35, and the tip 26 is inclined toward the center so that it can be easily inserted into the key groove 35. The rear 25a of the projection 25 is a substantially vertical surface. For this reason, the projection 25 serving as a key is inserted into the key groove 35.
When the mounting portion 22 is turned when the protrusion 25 reaches the opposite side of the mounting holder 30, the rear surface 31b of the mounting holder 30 and the protrusion 25 are engaged. Therefore, the mounting portion 22, that is, the insert holder 20 is
Will not come off from the formwork 1 to which is attached.

Further, a set of stoppers 27 is provided at an intermediate portion in the longitudinal direction of the mounting portion 22 in this embodiment at a position turned by 90 degrees from the projection 25 serving as a key. In this example, each stopper 27 is constituted by a set of low-height protrusions 27a extending in parallel to the axial direction of the mounting portion 22, and the interval between the protrusions 27a is determined by the keyway 35 of the mounting holder. When the insert holder 20 is inserted and turned 90 degrees, the stopper 27
Are engaged with the key groove 35 and cannot be turned in any direction.

Further, a groove 28 is formed along the boundary between the mounting portion 22 and the main body 21, and when an appropriate shearing force or tensile force acts between the mounting portion 22 and the main body 21, these grooves are formed at the boundary. That is, it is divided from the groove 28 portion. Therefore, when the mounting portion 22 is mounted on the formwork 1 and the formwork is separated from the concrete product while the main body 21 is embedded in the concrete product, the mounting portion 22 is automatically separated from the main body 21.

FIG. 4 shows the appearance and structure of a mounting holder 30 for mounting the insert holder 20 to the mold 1. As shown in FIG. FIG. 4A is a plan view (the same applies to a bottom view) of the mounting holder 30, and FIG.
0 is the front view (the same applies to the back view and the left and right side views). 4C is a sectional view including the key groove 35, and FIG. 4D is a sectional view orthogonal to the key groove 35.
As can be seen from these figures, the mounting holder 30 of this example is
Is a cylindrical member, and is formed of durable iron or other metal in this example. Inside the mounting holder 30, there is provided a through hole 32 which is a mounting hole having an inner diameter substantially equal to or slightly larger than the outer diameter of the mounting portion 22 of the insert holder 20.

Further, the axially symmetric position (1
A set of key grooves 35 is formed at a position (80 degrees).
The key groove 35 is attached to the mounting unit 3 along the through hole 32.
0 is a substantially rectangular groove penetrating from the front surface 31a to the back surface 31b. By inserting the mounting unit 30 into the opening 8 of the mold 1 or by attaching it to the back side of the opening 8 by welding or the like, the insert holder 20 is cooperated with the mounting portion 22 of the insert holder 20. A lockable structure can be provided on the formwork 1. Of course, it is also possible to machine the keyway in the mold itself. However, since the mold 1 is usually formed using an iron plate or the like that is not so thick as several mm, it is difficult to take a length for guiding the mounting portion 22. Therefore, it is better to use the mounting unit having a certain thickness as in this example.
0 posture can be stably held.

Although machining of the keyway requires a certain degree of accuracy, it is difficult to machine the keyway with high accuracy in the large mold 1. On the other hand, the mounting holder 30 is a small component, and processing with high accuracy is easy. Therefore, the mounting holder 30 that has been processed with high precision in advance is attached to the mold 1
, A lock mechanism capable of mounting the insert holder 20 can be easily provided on the mold.

With reference to FIGS. 5 to 7, a process of manufacturing a concrete product in which the insert 15 is embedded using the insert holder 20 of the present embodiment will be described. FIG.
As shown in (a), the insert holding tool 20 is
1 is mounted on the mold 1 with the insert 15 inserted therein. Of course, the insert 15 may be inserted after the insert holder 20 is attached to the mold 1. An opening 8 is previously formed in the mold 1 corresponding to the position where the insert 15 is buried, and the mounting unit 30 is attached to the back surface 1 a by welding 40. Therefore, the key 25 provided on the mounting portion 22 of the insert holder 20 and the key groove 35 provided on the mounting unit 30 are provided.
When the mounting portion 22 is inserted into the through-hole (mounting hole) 32 of the mounting unit 30 with the position of the mounting unit 30, as shown in FIG.
Can be plugged into zero.

As shown in FIG. 5 (b), the insert holder 20 is rotated 90 degrees clockwise or counterclockwise with the key 25 of the mounting portion 22 penetrating the mounting unit 30. As a result, as shown in FIG. 5C, the stopper 27 is at the position of the key groove 35, and the projection 27a is fitted into the key groove 35. Therefore, the insert holder 2 can be moved in either clockwise or counterclockwise direction.
0 stops turning.

The mounting portion 22 of this embodiment is made of plastic and has a certain degree of elasticity.
Is not a hindrance when inserting the mounting portion 22 into the through hole 32 because it is small unevenness. In the insert holder 20 of this example, a shallow groove is provided along the protrusion 27a so that the protrusion 27a is easily deformed when inserted. On the other hand, when the protruding portion 27a comes into contact with the key groove 35 by turning, the protruding portion 2
7a protrudes into the key groove 35, and if it attempts to turn any further, the protrusion 27a interferes with the edge of the key groove 35 and does not rotate. In order to prevent the key groove 35 and the stopper 27 from rotating due to interference, it is necessary to prevent the edge angle of the key groove 35 from becoming smooth. Therefore, as in this example, it is desirable that the mounting holder 30 be made of a metal and durable member.

In FIG. 5B, the insert holder 2
When the “0” is rotated by 90 degrees, the key 25 comes out of the key groove 35, so that the insert holder 20 is locked by the mounting unit 30 and does not come off the mold 1. Therefore, the insert 15 is firmly fixed to the predetermined position of the mold 1 via the insert holder 20.

In this embodiment, the distance between the contact surface 24c of the lower flange portion 24 of the insert holder 20 and the rear surface 25a of the projection 25 serving as a key at the tip of the mounting portion 22 is determined by the thickness of the mold 1. The thickness of the mounting holder 30 is set to be equal to or slightly shorter than the total thickness. Therefore, when the insert holder 20 is mounted on the mounting holder 30, the contact surface 24 c of the flange portion 24 is pulled toward the mold 1, and can be mounted so that there is almost no gap with the mold 1. For this reason, when the concrete is poured, the concrete itself or its back does not enter the mounting hole 9 or the through hole 32 of the mounting holder 30.

Further, by inserting a packing made of plastic, rubber, paper, or the like between the lower flange 24 of the insert holder 20 and the surface 1b of the mold 1, the mold 1 and the flange 24 are inserted. Can be filled. Alternatively, a material corresponding to the packing may be attached to the flange portion 24 in advance, or a thin-film shielding member may be formed along the periphery of the flange portion 24. By providing such a member for preventing the intrusion of concrete or slug, it is possible to absorb dimensional tolerances and the like of the formwork or the insert holder. For this reason, the mounting holder 30 having a fixed thickness can be used without being affected by the thickness of the mold, and the like, and a simple and highly versatile holder can be provided.

As described above, the insert holder 20 of this embodiment is
Simply inserts the mounting portion 22 into the through hole 32 of the mounting holder 30 (FIG. 5A), and then turns the insert holder 20 by 90 degrees (FIG. 5B). At a predetermined location. Therefore, worker 1
The insert can be mounted by a person anywhere on the formwork. In addition, since it is not necessary to rotate the insert holder 20 many times as with a screw, the mounting operation can be completed in a short time. Therefore, even in the case of a concrete product in which an enormous number of inserts are buried, such as a common groove, the work of setting the inserts can be performed in a short time.

Further, when the insert holder 20 is mounted, the key 25 of the mounting portion 22 only passes through the key groove 35 of the mounting holder 30, so that there is no portion where the mounting portion 22 is largely elastically deformed. Therefore, the insert holder 20 can be mounted with a small force. Further, since there is no elastically deformed portion, even if the hardness or rigidity of the plastic constituting the mounting portion 22 or the like increases due to the temperature, the force required for mounting does not largely change. In addition, since there is no portion that is deformed by the mounting portion 22 when the device is mounted, no trouble such as the chipping of the portion when the temperature is lowered does not occur. In this example, there is a portion where the deformation is expected at the stopper 27, but it is a very small portion and the degree of deformation is not large. Therefore, there is almost no effect of the temperature drop.

On the other hand, as shown in FIG. 5 (c), when the insert holder 20 is turned and then turned, the key 25 comes off the key groove 35, so that the insert holder 20 cannot be removed from the mounting unit 30 and is not sufficiently removed. A mounting force (adhesive force) is obtained. Even in this state, the mounting portion 2
2 or large elastic deformation with the mounting holder 30,
Alternatively, there is no portion fitted to obtain the mounting force. Therefore, even if the characteristics such as the elasticity of the plastic constituting the mounting portion 22 change due to the temperature, the mounting force does not change, and the insert holder 20 can be securely mounted in any season and in any region. Can be attached to the unit 30.

As described above, in this embodiment, since the insert holder 20 is mounted on the mold 1 in a combination of a key and a key groove, a large adhesive force can be obtained, and fluctuations due to temperature and the like are very small. . Therefore, as shown in FIG. 6, when concrete 3 is poured into form 1 to produce concrete product 5, when concrete 3 is removed from form due to the poured concrete, and when vibrating to compact. The position within the concrete product does not change.

In particular, in the insert holder 20 of the present embodiment, the force of the engagement between the key and the key groove (in this example, the rear surface 31b from the key groove) becomes the adhesive force, not the force such as elastic force or friction. So a big power is obtained. Therefore, it is suitable for embedding an insert having a large diameter or a long insert.

FIG. 7 shows a state in which the concrete product 5 in which the insert 15 is buried at a predetermined position by the insert holder 20 is removed after an appropriate period has elapsed. In the insert holder 30 of this example, a groove 28 is formed at the boundary between the mounting portion 22 and the main body 21 so that the insert holder 30 is easily divided. For this reason, as shown in the drawing, for example, when the mold 1 is lifted upward and removed from the concrete product 5, a shear force acts between the concrete product 5 and the mold 1, whereby the mold 1 is mounted on the mold 1. The mounted portion 22 is cut from the main body 21 embedded in the concrete product 5.
Therefore, even when manufacturing a concrete product in which an insert is embedded, it is possible to remove the mold with the same procedure and effort as a concrete product in which an insert is not embedded, without taking the time to remove a bolt for mounting the insert.

Of course, the mounting portion 22 can be separated from the main body 21 by the force acting when the mold 1 is pivoted or detached from the concrete product 5 in a parallel manner. Can be removed without any trouble. In particular, the inner formwork that forms the inner surface of the box or culvert is not accessible to a worker when the mold is removed. For this reason, a buried object that automatically comes off the formwork like the insert holder of this example is useful.

Since a force such as a shearing force acting when the mold is removed is concentrated on a boundary portion between the mounting portion 22 and the main body 21, the mounting portion 22 is cut off from the main body 21 without providing the groove 28. It is possible to do so. However, it is desirable to provide a groove or the like in order to reliably determine the portion to be cut and cleanly cut the portion so that the portion is structurally slightly weaker than other portions.

As shown in FIG.
Is left in the through hole 32 of the holder 30. However, since the mounting portion 22 is separated from the main body 21, the lock is released, and when the next mounting portion 22 of the insert holder is inserted from the surface 1 b side of the mold 1, the mounting portion 22 remains in the through hole 32. The mounting portion 22 is naturally located on the back surface 1a of the formwork 1.
Extruded from Therefore, the insert holder 20 can be easily mounted in the same place many times.

FIG. 8 shows an insert holder 50 according to another embodiment of the present invention. This insert holder 50
Also has a cylindrical body 5 capable of holding the inserted insert.
1, and a cylindrical or columnar insertion portion 52 protrudes from the main body 51. A key groove 55 extending in the axial direction instead of the key is formed in the insertion portion 52 of this example. The key groove 55 is provided in the insertion portion 5 extending in the axial direction.
5a, a lock portion 5 bent in the circumferential direction in the vicinity of the main body 51
5b. The tip 56 of the mounting portion 52 is slightly thinner. And the insertion part 52 and the main body 51
They are connected by a thin-film portion 59 which is thinner than the surroundings, but has sufficient strength to obtain an appropriate holding force. Therefore, in the insert holder 50 of this example, the thin-film portion 59 is broken by the force acting when the mold is released, and the mounting portion 52 is separated from the main body 51.

The main body 51 is provided with a flange 54a for reinforcement and pull-out prevention on the upper side, and the lower surface of the main body 51 is a contact surface 54c with the mold 1. Further, a set of small convex portions 57a serving as the stopper 57 is formed on the contact surface 54c.

On the other hand, the mounting holder 60 into which the mounting portion 52 is inserted is provided with a through-hole 62 that penetrates the holder 60 with an inner diameter substantially equal to the outer diameter of the mounting portion 52. Become. Further, a protrusion 65 serving as a key protruding in the axial direction of the through hole 62 is formed on the surface 61 a of the holder 60. In addition, a groove (dent) 69 that engages with the stopper 57 of the main body 51 is provided on the front surface 61a.
When the insert holder 50 is turned by a predetermined angle, it does not move.

As shown in FIG. 9, this mounting holder 60 can also be attached to the opening 8 provided in the mold 1 in the same manner as described above. In this example, an opening 8 having a diameter enough to accommodate the holder 60 is provided in the mold 1, and the holder 60 is fixed to the mold by welding 40 with the holder 60 inserted therein.

In the combination of the insert holder 50 and the holder 60 of this embodiment, as shown in FIG. 9A, the key groove 55 of the mounting portion 52 of the insert holder 50 is
Insert it according to the protrusion 65 serving as a key of 0. And
When the contact surface 54c of the main body 51 contacts the surface 1b of the mold 1, the insert holder is turned counterclockwise when viewed from the insert holder 50 side. Thereby, FIG. 9 (b)
As shown in (5), the key 65 of the holder 60 enters the lock portion 55b of the key groove of the mounting portion 52, and the insert holder 50 does not come off the holder 60, that is, the mold 1. Therefore, the insert holder 50 can be mounted very easily and in a short time.

The lower surface 65a of the projection 65 provided on the holder 60 of this embodiment is slightly inclined, and when the insert holder 50 is turned, the mounting portion 52 is
It is drawn in two directions. Therefore, when the insert holder 50 is turned and locked, the lower contact surface 54c of the main body 51 is pressed against the surface 1b of the mold 1. For this reason, it is possible to prevent concrete or slug from entering the through hole 62 of the holder 60.
Of course, also in the present embodiment, similarly to the above, a seal using a material having a moderate elasticity may be sandwiched between the mold 1 and the main body 51 for sealing.

Further, the stopper 57 of the insert holder 50 and the groove 69 on the surface of the holder 60 are set at an angle at which the key 65 enters the lock portion 55b. In particular, the insert holder 50 of this example is easily locked because the stopper 57 is in close contact with the surface 61a of the holder 60 due to the inclination of the key 65 of the holder 60. Therefore, even in the combination of the insert holder 50 and the holder 60 according to the present embodiment, the insert holder 50 can be securely attached to the mold frame 1 as described above, and a large adhesive force can be obtained.

As described above, according to the present invention, the combination of the key and the key groove allows the simple but reliable mounting between the embedded product of the concrete product such as the insert holder and the formwork to which it is mounted. A lock mechanism is provided. And, in this lock mechanism, since there is no part that largely deforms elastically when the concrete buried object is mounted on the formwork, the adhesive force changes with the fluctuation of the temperature, or the key or the key groove and the like. Related parts are not damaged. Therefore, an extremely stable large adhesive force can be obtained under any conditions. Therefore, even a large and heavy concrete buried object can be securely attached to the formwork, and the key or the mounting portion provided with the key groove is cut by the force when the mold is released. By doing so, the demolding operation can be performed very easily.

In the above description, an example in which one or two projections serving as keys are provided is described.
It is also possible to adopt a combination of a key and a key groove provided with three or more key protrusions. Further, the position of the stopper is not limited to the above example, and can be set at any position as long as the concrete buried object comes into contact with the mounting holder or the formwork. Of course, it is also possible to provide a stopper on the holder.

In this embodiment, a holder having a circular outer periphery is described as an example. However, the outer periphery of the holder is not limited to a circle, but may be a polygon or the like. Further, the hole into which the mounting portion is inserted is not limited to the through hole, and may be any size as long as the mounting portion can be inserted. If it is not a through hole, any key groove may be used as long as the key can be locked similarly to the above-described key groove. Further, the mounting portion and the mounting hole described above are substantially circular, but are not limited to a circular shape as long as they can be locked by using a key and a key groove. However,
A circular shape is suitable as a revolvable shape.

In the above description, an insert holder is described as an example of a buried object buried in concrete, but the insert itself may be provided with a mounting portion according to the present invention so that the insert can be mounted on a formwork. Of course it is possible.
Further, the insert is not limited to the insert having a female screw formed therein so that a bolt or the like can be attached thereto, and it is needless to say that the insert may be embedded in a concrete product for another purpose. Furthermore, even if it is not an insert, if it is a buried object that can be set in a mold and buried in a concrete product, it can be buried at any time by applying the present invention, Concrete products with buried objects can be manufactured.

FIG. 10 shows an insert holder 100 according to still another embodiment of the present invention. In addition, FIG. 11 shows a state in which the insert holder 100 of the present example is attached to the mold 1 via a boss 120 as a setting tool while holding the insert 15, using a part of the cross section. The insert holder 100 is attached to the boss 120 mounted on the mold 1 with a mounting portion, similarly to the insert holder described above with reference to FIGS. 14 and 15. That is, the insert holder 100 of the present example has a substantially cylindrical shape with both ends open, one end is a holding side 81 into which a cylindrical insert can be inserted, and the other end has the insert holder attached to a mold. The mounting side 82 is used for mounting. On the mounting side 82, an inner cylindrical portion 85 serving as a mounting portion and an outer cylindrical portion 83 covering the outside thereof are formed.
A gap 86, which is a space in which 5 can be deformed, is also formed.

On the inner peripheral surface 85a near the inner cylindrical portion 85, a boss 12 attached to the mold 1 is provided near the tip 85b.
A groove 105 for fitting the insert holder 100 into the mold 1 by fitting it into the mold holder 1 is provided. In the insert holder 100 of the present embodiment, the portion from the groove 105 and the tip 85b to the groove 105 has a key groove structure.
That is, the groove 10 extends from the distal end 85b in the axial direction of the inner cylindrical portion 85.
5 are formed at two positions, and the grooves (key grooves) 1 for locking the key are formed.
Connected to 05. Therefore, when the key enters the groove 105 extending in the circumferential direction through the groove 106, the insert holder 100 is rotated by rotating the insert holder 100.
0 can be locked. The other parts of the structure of the insert holder 100 are the same as those described above, and thus are denoted by the same reference numerals and detailed description thereof will be omitted.

The basic structure of the boss 120 is the same as that described with reference to FIG. That is, this boss 12
Reference numeral 0 is a setting tool for setting the insert 15 to the mold 1 via the insert holder 100. For this reason, a thin disk-shaped boss body 71 made of metal and a bolt 72 extending from one end thereof are provided, and can be fixed to a hole 73 opened at a predetermined position of the mold 1 by a nut 74. In the boss 120 of this example, along the outer periphery of the boss body 71,
Projections 121 serving as keys are formed at two positions corresponding to the key grooves 106 of the insert holder 100. Therefore, the boss 120 of this example and the insert holder 100
When the key 121 of the boss 120 is aligned with the key insertion groove 106 of the inner cylindrical portion 85 of the insert holder 100, the inner cylindrical portion 85 of the insert holder 100, that is, the mounting side 82 is put on the boss 120. be able to.
After that, insert holder 10
When the user pivots with the insert 15 or the insert 15 attached thereto, the key 121 enters the lock groove 105 extending in the circumferential direction of the inner cylindrical portion 85, and the insert holder 100 and the insert 15 are fixed at predetermined positions of the mold 1. Is done.

Further, a groove 10 for inserting a key when the insert holder 100 is rotated is formed on the outer peripheral surface of the boss 120.
A set of small projections or projections 125 extending in the axial direction is provided at positions where the projections 125 engage with 6. Therefore, similarly to the above-described example, these projections 125 function as stoppers, and at one end, the insert holder 100 is swung to rotate the boss 12.
Key 121 of the insert holder 100
Once you have entered 5, you can no longer turn,
The lock by the key 121 cannot be released.

Therefore, the insert holder 10 of this embodiment
In the same manner as in the above example, a lock mechanism that can be easily but securely fixed between the insert holder, which is a buried concrete product, and the formwork to which the insert holder is attached by combining a key and a key groove as in the above example. Make up. And, in this lock mechanism, since there is no portion that largely deforms elastically when the concrete buried object is mounted on the formwork, when the adhesive force changes with the temperature change or when the insert holder is fixed to the boss, The mounting part does not break or even break. Therefore, the insert holder 100 made of plastic is not elastically deformed, and FIG.
As shown in FIG.
, And the insert holder 100 and the insert 15 are fixed to the mold 1. FIG. 12 shows a state where the insert holder 100 is turned by about 90 degrees from the state shown in FIG. As a result, extremely stable and high adhesion can be obtained without depending on the elasticity of the plastic under any conditions, and even large and heavy concrete buried objects can be securely attached to the formwork. Become. Therefore, after that, concrete 3 is poured into the inside of the form 1 to thereby insert 1 as a concrete buried object.
The concrete product 5 in which the insert holder 5 and the insert holder 100 are buried in predetermined positions is manufactured.

Further, in the insert holder 100 of this embodiment, a space (gap) 86 in which the inner cylindrical portion 85 as a mounting portion can be deformed outward is secured between the inner cylindrical portion 85 and the outer cylindrical portion 83. Is done. Therefore, as shown in FIG. 12B, even when the mold 1 is turned and the center axis of the boss 120 is removed so as to be inclined with respect to the center axis of the insert holder 100, the inner cylinder portion 85 is Easily deforms inside. For this reason, the formwork 1 can be easily removed without causing chipping in the concrete product 5. At this time, the inner cylindrical portion 85 may be deformed or broken, but since the inner cylindrical portion 85 has a function of fixing the insert holder 100 to the mold 1, the inner cylindrical portion 85 is unnecessary after being removed from the mold. Therefore, there is no problem even if it is damaged when the mold is removed.

When the concrete product 5 is a block for a manhole or a large box for a buried electric conduit, the form (outer form) 1 for molding the outside is often removed while turning. Therefore, in the case of the insert holder 100 of this example, when the insert 15 is attached to the outer mold 1 and a concrete product having the insert buried in a predetermined position is manufactured, the outer mold 1 is swung as it is to concrete. It can be removed from the product. For this reason, the concrete product in which the insert is embedded can be released from the mold without an extra step of removing the boss similarly to the concrete product in which the insert is not embedded.

As described above, the key and the key groove are not limited to the above-described example even for the concrete buried object mounted on the boss of this embodiment. It is also possible to provide a projection serving as a key on the side of the insert holder and to provide a key groove on the side of the boss, and even if the number of projections serving as the key is not two but one or three or more. good. Further, an example of a double structure of the inner cylinder portion 85 and the outer cylinder portion 83 is described, but a projection serving as a key is largely protruded inward from the cylinder portion and combined with a boss, and the projection is deformed inside the cylinder portion. It is also possible to ensure possible space. Also, if the mold has a large turning radius when it is removed from the mold or the mold is kept parallel to the surface of the concrete product, that is, if the mold can be removed without turning, a space for deforming the key or keyway is provided. Even if an uninserted insert or insert holder is used, the mold can be removed without causing chipping or the like.

Further, by tilting the key or the key groove with respect to the center axis, when the insert holder is inserted into the boss and turned, the insert holder is locked to the boss, and the outer cylindrical portion 83 serving as a contact surface with the formwork. Can be pressed against the surface of the mold 1. Therefore, the gap 86 inside the outer cylindrical portion 83 is more completely sealed, and it is possible to more reliably prevent a concrete slug or the like from entering the inside.

[0068]

As described above, in the present invention, a concrete buried object such as an insert or an insert holder can be mounted on a form by a combination of a key and a key groove. Therefore, the concrete buried object can be mounted on the form without being elastically deformed.
Further, since the combination of the key and the key groove is used, unlike the case of mounting using screws, the mounting can be performed only by turning a predetermined angle, and the mounting can be performed without trouble. Therefore, the state of mounting on the formwork does not change depending on conditions such as temperature, and concrete buried objects such as inserts can be extremely easily and reliably mounted on the formwork in any season or any region. Therefore, by using the concrete buried object, the mounting holder, the formwork and the manufacturing method according to the present invention, it is possible to reliably manufacture and provide a concrete product in which the concrete buried object is buried without trouble.

[Brief description of the drawings]

FIG. 1 is a developed view showing an insert, an insert holder, a mold and a mounting holder according to an embodiment of the present invention.

2 (a) is a front view, FIG. 2 (b) is a right side view, FIG. 2 (c) is a plan view, and FIG. d) is a bottom view.

FIG. 3 is a cross-sectional view showing a structure of the insert holder shown in FIG.

FIG. 4 is a view showing the mounting holder shown in FIG. 1;
4A is a plan view, FIG. 4B is a front view, FIG. 4C is a sectional view including a keyway, and FIG. 4D is a sectional view perpendicular to the keyway.

FIG. 5 is a view showing a state in which the insert holder shown in FIG. 1 is mounted on a mold.

FIG. 6 is a view showing a state in which concrete is injected and concrete product is formed after the insert holder is mounted on a mold.

FIG. 7 is a view showing a state in which a concrete product in which an insert holder is embedded is released.

FIG. 8 is a view showing different examples of the insert holder and the mounting holder according to the present invention.

FIG. 9 is a diagram showing a state in which the insert holder shown in FIG. 8 is mounted on a mold using a mounting holder.

FIG. 10 is a view showing another example of the insert holder according to the present invention and a mounting boss.

11 is a diagram showing a state where the insert holder and the boss shown in FIG. 10 are attached to a mold.

12 is a view showing a state where the insert holder and the boss shown in FIG. 10 are fixed (FIG. 12 (a)) and a state when the mold is removed (FIG. 12 (b)).

FIG. 13 is a view showing an example in which a projection is deformed and mounted.

FIG. 14 is a view showing a conventional example of an insert holder of a type attached to a boss.

FIG. 15 is a view showing a state where the insert holder and the boss shown in FIG. 14 are assembled to a mold.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Formwork, 1a Backside of formwork, 1b Formwork surface 3 Concrete, 5 Concrete product 9 Mounting holes 10, 15 Inserts 20, 50, 80, 100 Insert holders 21, 51 Main body, 22, 52 Mounting part 23 Opening 24c, 54c Contact surface 25, 65 Key projection 27, 57 Stopper 30, 60 Mounting holder 32, 62 Through hole 35, 55 Key groove 69 Stopper groove 81 Holding side 82 Mounting side 83 Outer cylinder part 85 Inner cylinder Part 86 Gap 105 Key groove, 106 Key insertion groove 70, 120 Mounting boss (setting tool) 71 Boss body 121 Key (projection) 125 Stopper

Claims (17)

[Claims] 1. A body buried in a concrete product is fitted with a mounting hole or a mounting boss provided in a formwork for manufacturing the concrete product, and when turned thereafter, the main body comes out of the mounting hole or the boss. A concrete buried object having a key or keyway with a missing key. 2. The device according to claim 1, wherein the mounting portion protrudes from the main body so as to be inserted into the mounting hole, and is separable from the main body by a force when the concrete product is removed from the main body. Concrete buried objects. 3. The mounting part according to claim 1, wherein the mounting part is disposed on a side of the main body facing the mold so as to cover the boss. An embedded concrete object in which a deformable space is formed around the mounting portion. 4. The concrete buried object according to claim 1, further comprising a stopper for preventing the main body from turning in any direction with respect to the mold at a position where the main body is not swiveled with respect to the mold. 5. The concrete buried object according to claim 1, further comprising a contact surface that comes into contact with the surface when the mold is mounted on the formwork, and wherein the contact surface extends outside the outermost periphery of the mounting portion. 6. The concrete buried object according to claim 2, wherein a tip of the mounting portion is thin. 7. The concrete buried object according to claim 2, wherein the mounting portion is cylindrical, and a key or a key groove is formed around the mounting portion. 8. The concrete buried object according to claim 3, wherein the mounting portion is cylindrical and has a key or a key groove formed therein. 9. A mounting part protruding from a main body of a concrete buried object buried in a concrete product can be inserted,
A mounting holder having a mounting hole provided with a key or a key groove which does not come off when the concrete buried object is turned thereafter. 10. The mounting holder according to claim 9, further comprising a stopper for preventing the concrete buried object from turning in any direction at a position where the concrete buried object cannot be swiveled. 11. A formwork for producing a concrete product, comprising the holder for mounting an object to be embedded according to claim 9 or 10. 12. A concrete buried object to be buried in a concrete product is provided with a key or a key groove which covers a mounting portion provided on a side facing the formwork of the main body, and which does not come off when the concrete buried object is turned thereafter. Boss with protrusion. 13. The boss according to claim 12, further comprising a stopper for preventing the concrete buried object from turning in any direction at a position where the concrete buried object is not swiveled. 14. A mold for manufacturing a concrete product having the boss according to claim 12. 15. A step of matching a mounting portion of a concrete buried object having a main body buried in the concrete product to a mounting hole or a mounting boss provided in a form for manufacturing the concrete product; A method of manufacturing a concrete product, comprising: a step of combining a key and a key groove so that the concrete buried object does not come off by turning, and a step of injecting concrete into the formwork to mold a concrete product. 16. The mounting device according to claim 15, wherein
A method for manufacturing a concrete product, comprising: a step of projecting from the main body so as to be inserted into the mounting hole, and separating a vicinity of a boundary between the mounting portion and the main body by a force when the concrete product is released. 17. The mounting device according to claim 15, wherein
A space which is arranged on the side of the main body facing the form so as to be put on the boss, and in which the mounting portion is deformed when the concrete product is removed from the mold, is formed around the mounting portion; Removing the mold so that the boss is inclined with respect to the mounting portion when removing the mold.