JP2000052326A - Insert holder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insert holder enabling improvement of the operability of fitting an insert to a frame and removing it therefrom. SOLUTION: An insert holder is formed of a material which can be broken at a prescribed position thereof by the relative movement of a frame and a concrete molded article 31 and also it has a disk-shaped flange part 2 and an insert fitting part 4 and a fixing nut fitting part 6 shaped like columns and projected integrally from the opposite lateral sides of the flange part. An insert contact surface 2a with which the opening-side end face of an insert 10 is brought into contact is formed on the lateral side of the flange part on the insert fitting part 4 side and the diameter of the outer peripheral surface of the insert fitting part 4 is made smaller than the inside diameter of an internal thread 11a of the insert, while a crest part 5 of which the diameter is enlarged in the direction of the outside diameter from the outer peripheral surface is formed in the axial direction and, on the other side, the diameter of the crest part 5 is increased toward the base end part side of the insert fitting part 4 from the fore end part thereof. Thereby an external thread is formed from the middle in the axial direction of the crest part, while the insert is fitted by screwing to the insert fitting part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insert holder for a formwork for holding an insert in a formwork when the insert is buried in a concrete molded product.

[0002]

2. Description of the Related Art The present applicant has proposed an insert holder (hereinafter, referred to as a holder) in Japanese Patent Application Laid-Open No. H10-029210. The holder has a disk-shaped flange and circular outer portions on both sides of the flange, and is formed of a fragile material that can be broken in a tangential direction of the mold.

[0003] One outer circular portion is fitted to the female screw of the fixing nut fixed to the mold while being self-tapped, and the other outer circular portion is fitted to the female screw of the insert while being self-tapped. By doing so, the insert is attached to the formwork. Then, concrete is poured into the form while the insert is held in the form.

[0004] Since the holder is formed of a fragile material that can be broken in the tangential direction of the mold, the concrete can be solidified and the mold can be slid to remove the mold by simply sliding the mold. , To improve the workability of demolding.

[0005]

However, since the holder is made of a fragile material such as styrene foam, the holder is rarely used when concrete is poured by applying vibration to ensure the fluidity of the concrete. In some cases, the holder may break and the insert may come off the formwork. To address this problem, the Applicant has been working diligently.

For example, an attempt was made to use a synthetic resin as a material that has a predetermined strength and that can be broken by relative movement between a mold and a concrete molded product, instead of a brittle material such as styrene foam. However, in the shape of the holder, since the outer peripheral surface of the outer circular portion is fitted to the female screw while being self-tapped, when a synthetic resin having a certain hardness is used, the bite is strong and cannot be easily fitted. . In addition, a solid synthetic resin holder cannot be easily broken because it is strong.

The present invention has been made in view of such circumstances, and an object of the present invention is to make it possible to use a material such as a synthetic resin having a predetermined strength even if a material such as a synthetic resin is used. Can reliably break the holder by moving it properly, improving the workability of inserting the insert into the mold while securing the ease of demolding work, and removing the holder from the insert and the mold. An object of the present invention is to provide an insert holder capable of improving the performance.

[0008]

The insert holder according to the present invention is formed of a material which can be broken at a predetermined position of the insert holder by the relative movement of the mold and the concrete molded product, and has a disk-shaped flange. And an insert having a columnar insert mounting portion and a fixed nut mounting portion integrally projecting from both side surfaces of the flange portion, wherein an opening-side end face of the insert is brought into contact with a side surface of the flange portion on the side of the insert mounting portion. The contact surface is formed, the outer peripheral surface of the insert mounting portion is made smaller in diameter than the inner diameter of the female screw of the insert, and the ridge portion that is enlarged in the outer diameter direction from the outer peripheral surface is formed in the axial direction, while the ridge portion is inserted. By increasing the diameter from the distal end side to the proximal end side of the mounting part, the insert is screwed to the insert mounting part while forming a male screw from the middle of the mountain part in the axial direction. I do.

According to a second aspect of the present invention, in the insert holder, the width of the peak portion in the outer peripheral direction is formed to be constant in the axial direction.

According to a third aspect of the present invention, there is provided the insert holder, wherein the width of the peak portion in the outer peripheral direction is formed so as to increase toward the base end portion of the insert mounting portion.

[0011] The insert holder according to claim 4 is
The ridge is formed intermittently in the axial direction of the insert mounting portion.

The insert holder according to claim 5 is
When the insert mounting portion is fitted to the female screw of the insert, a screw is formed on the crest.

The insert holder according to claim 6 is
A male screw is threaded on the outer peripheral surface of the fixing nut mounting portion.

[0014] The insert holder according to claim 7 is
The outer peripheral surface of the fixed nut mounting part is smaller than the inner diameter of the female screw of the fixed nut that fixes and supports the holder to the formwork, and a ridge is formed in the axial direction that is larger in diameter than the outer peripheral surface of the fixed nut mounting part. On the other hand, by increasing the diameter of the crest portion from the distal end side of the fixed nut attachment portion toward the base end portion, while forming a male screw from the middle of the crest portion in the axial direction, the fixed nut attachment portion is attached to the fixed nut. Is screwed on.

[0015] The insert holder according to claim 8 is
It is characterized in that it has a hollow cross section.

[0016] The insert holder according to claim 9 is:
The inner wall surface is formed to be hexagonal in cross section.

According to a tenth aspect of the present invention, the insert holder is formed of a synthetic resin.

[0018]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 to FIG.
FIG. 16 is a drawing showing a second embodiment, FIG. 17 is a drawing showing a third embodiment, FIG. 18 and FIG.
9 is a drawing showing a fourth embodiment, FIG. 20 is a drawing showing a fifth embodiment, and FIGS. 21 and 22 are drawings showing a sixth embodiment.

FIG. 1 shows a first embodiment of the insert holder of the present invention.
FIG. 2 is a left side view in FIG. 1,
3 is a right side view in FIG. 1, and FIG.
FIG. 5 is a sectional view taken along line BB in FIG. 1, and FIG. 6 is a sectional view taken along line CC in FIG. 1. FIG. 7 is a sectional view taken along line DD in FIG. FIG. 8 is a half sectional view showing a part of a method of attaching the insert holder and the insert to the mold according to the present invention. 9 is a cross-sectional view in which a part of the state of attachment of the insert holder of the present invention to a formwork is a half cross-section, FIG. 10 is a right side view in FIG. 9, and FIG. 11 is a cross-sectional view taken along line EE in FIG. It is.

FIG. 12 is an enlarged view of a portion F in FIG.
FIG. 13 is a sectional view of a main part showing a state in which the insert holder of the present invention is broken. FIG. 14 is a sectional view of a main part showing a state in which the insert holder of the present invention is removed from the mold and the insert. FIG. 15 is a cross-sectional view in which a part of a modified example of a state where the insert holder of the present invention is mounted on a mold is a half cross section.

1 to 14, an insert holder 1 (hereinafter simply referred to as a holder) is formed of a synthetic resin, for example, polyethylene, and a disk-shaped flange 2 is formed at a substantially intermediate portion in the axial direction. ing. On the left side of the flange portion 2, a columnar insert mounting portion 4 is formed.
The outer diameter d1 (see FIG. 1) of the insert mounting portion 4 is equal to the inner diameter (peak diameter) D1 of the female screw 11a of the insert 10 described later.
(See FIG. 14). On the right side of the flange portion 2, a fixed nut mounting portion 6 having an external thread threaded on the outer peripheral surface is formed.

Between the flange portion 2 and the insert mounting portion 4, a break portion 3 having a smaller diameter than the insert mounting portion 4 is formed. The holder 1 has a hexagonal hole 7 whose inner wall surface penetrating in the axial direction has a hexagonal cross section. That is, the holder 1 has a hollow cross section, and in particular, the break portion 3 is formed to be thin. The hexagonal hole 7 is formed in a size compatible with a generally commercially available hexagonal wrench 30.

On the surface of the flange 2 on the side of the insert mounting portion 4,
An insert contact surface 2a is formed, and a fixed nut mounting portion 6 is formed.
A step 2b is formed on the side. Further, a tapered portion 2c is formed from the insert contact surface 2a toward the step portion 2b.

On the outer peripheral surface of the insert mounting portion 4, a ridge portion 5 whose diameter is increased in the outer diameter direction from the outer peripheral surface is formed in the axial direction. The ridge 5 is larger in diameter from the distal end side of the insert mounting portion 4 toward the base end side. And mountain part 5
Are formed at equal intervals in the outer peripheral direction of the insert mounting portion 4. In addition, the width of the peak portion 5 in the outer peripheral direction of the insert mounting portion 4 is formed to be constant in the axial direction of the insert mounting portion 4. In addition, the height h1 of the highest part of the crest 5 is determined by the relationship between the radius r1 of the insert mounting part 4 and the inner diameter D1 of the female screw 11a. 2
(1/1) (see FIGS. 1 and 14).

The insert 10 is made of metal and has a substantially cylindrical shape, and has a bottomed hole 11 which is open on one end face 10a side, and a female screw 11a is formed on the opening side of the bottomed hole 11. A base end of a conical spacer 12 is fitted and fixed to a fitting recess 10c provided on the other end face 10b of the insert 10. The spacer 12 is formed of, for example, a synthetic resin and has elasticity.

An insert mounting hole 21 is formed in the inner frame 20. Outer surface side 20b of insert mounting hole 21
Is formed with a tapered hole 21a, and a straight hole 21b is formed on the inner surface side 20a. A guide portion 22b having a cylindrical shape is formed in the fixing nut 22. The guide portion 22b is inserted into the insert mounting hole 21 of the inner mold frame 20 from the inner side 20a, and is fixed by welding 23.
A fixing nut 22 is fixed to the inner mold 20 in advance.

When the holder 1 is fitted to the insert 10, the insert mounting portion 4 of the holder 1 is inserted into the female screw 11a of the insert 10 as shown by an arrow A in FIG. Push the insert 10 while rotating it with the right hand.

At this time, the insert mounting portion 4 is inserted until the outer wall surface of the ridge 5 comes into contact with the ridge of the female screw 11a, and then the insert 10 (or the holder 1) is pressed against the female screw 11a while rotating. By this pressing, the male screw is formed on the outer wall surface of the crest portion 5 of the holder 1 (portion G in FIG. 12), that is, the female screw 11a of the insert 10 is fitted while being self-tapping. At this time, the male screw formed on the crest portion 5 is formed by deforming the crest portion 5 while the female screw 11 a bites into the outer wall surface of the crest portion 5. For this reason, the bottomed hole 11 of the insert 10
No chips are generated inside. The holder 1 and the insert 10 are fitted by bringing the end surface 10a of the insert 10 into close contact with the insert contact surface 2a of the holder 1. In addition, the end face 10a of the insert 10 is slightly deformed elastically by the end face 10a of the insert 10 so that the insert contact face 2a is formed.
And a higher degree of sealing.

Since (the outer diameter d1 of the insert mounting portion 4) <(the inner diameter D1 of the female screw 11a) (see FIGS. 1 and 14),
Even if the end face 10a of the insert 10 is fitted to the place where the end face 10a comes into close contact with the insert contact surface 2a of the holder 1, the thread of the female screw 11a of the insert 10 does not reach the insert mounting portion 4. That is, the internal thread 11a of the insert 10
The portion to be tapped is limited to only the peak portion 5, and even if the holder 1 is formed of a synthetic resin having a predetermined hardness, the holder 1 and the insert 1 can be formed only by hand force.
0 can be fitted.

Thereby, the holder 1 is inserted into the insert 10.
Is attached and integrated, and is shipped from an insert maker in this state, for example, and is attached by a molding maker of the concrete molded product 31.

An operation of attaching the insert 10 provided with the holder 1 to the inner mold 20 will be described. Insert 10
The fixing nut mounting portion 6 of the holder 1 is moved so as to advance in the direction of arrow B in FIG. 8, and the fixing nut mounting portion 6 is screwed into the female screw 22 a of the fixing nut 22. As shown in FIG. 12, the holder 1 is
The stepped portion 2b of the holder 1 is brought into contact with the holder 2c, and the holder 1 is fixed to the inner mold 20 by screwing into the tapered hole 21a of the inner mold 20 until the tapered portion 2c of the holder 1 comes into contact. Thus, the insert 10 is fixedly supported by the inner mold 20 via the holder 1.

After the insert 10 is attached to the inner mold 20 via the holder 1 in this manner, the outer mold 25 is set at a predetermined position, for example, facing the inner mold 20.
Due to the setting of the outer mold frame 25, the spacer 12 of the insert 10 comes into contact with the inner surface 25a of the outer mold frame 25, and the tip of the spacer 12 is elastically deformed. Is held by the holder 1 and the elastic spacer 12. In this state, the inner mold 20
And the concrete 30 is struck between the outer mold frames 25.

When the concrete 30 is solidified and the concrete molded product 31 is formed, the outer mold frame 25 is moved outward as shown by the arrow in FIG. I do. Also, the inner form 20 is
The inner mold 20 is removed from the concrete molded product 31 by being moved outward as indicated by the arrow E in FIG.

As shown in FIG. 14, by removing the concrete molded product 31, an arbitrary position of the fractured portion 3 along the tangent line Ls of the inner mold frame 20 is applied to the holder 1.
And breaks. The holder 1 breaks relatively easily with a force equal to or higher than a predetermined value, and the shape of the broken surface H is not constant but breaks in a random shape. The broken holder 1 is a fragment 1 comprising an insert mounting portion 4.
5 is an insert 1 embedded in a concrete molding 31
The fragment 16 including the flange 2 and the fixing nut attaching portion 6 remains in the female screw 22 a of the fixing nut 22 of the inner mold 20.

Then, in order to extract the fragments 15 of the holder 1 remaining in the female screw 11a of the insert 10 from the female screw 11a of the insert 10, first insert a hexagon wrench 35 into the hexagon hole 7 of the fragment 15 (see FIG. (14 arrow direction)
I do. Next, the hexagon wrench 35 is rotated, and the female screw 11a is rotated.
The debris 15 is extracted further (in the direction of the arrow in FIG. 14). The debris 15 is not located on the female screw 11a, and does not have any adverse effect on the tightening of the bolt to the insert 10. Also, the debris 1 remaining in the fixing nut 22
In order to extract 6 from the fixing nut 22, first, a hexagon wrench 35 is inserted into the hexagon hole 7 of the fragment 16 (in the direction of the arrow in FIG. 14). Next, the hexagon wrench 35 is rotated to extract the fragments 16 from the fixing nut 22 (in the direction of the arrow in FIG. 14). Thereby, the inner mold 20 can be reused.

In this mounting method, the insert 10 and the holder 1 are used in an integrated state, and the fixing nut mounting portion 6 of the holder 1 is fixed to the fixing nut 2 of the inner mold 20.
Although it is fitted and attached to the second female screw 22a, for example, the insert 10 and the holder 1 can be used in a divided state. In this case, first, the fixing nut attaching portion 6 of the holder 1 is fitted to the female screw 22a of the fixing nut 22,
Then, the female screw 11a of the insert 10 is attached to the insert mounting portion 4 of the holder 1 mounted on the inner mold 20.
And the insert 10 is attached to the inner mold 20 via the holder 1.

As described above, according to the holder 1, even when a material having a predetermined strength, such as a synthetic resin, is used, the inner mold 20 and the concrete molded product 3 are used.
The holder 1 can be broken by the relative movement of the holder 1 and the holder 1 can be reliably broken after the molding, thereby facilitating the demolding operation. Even if the holder 1 has a predetermined strength, only the outer wall of the ridge 5 is self-tapped to the female screw 11a of the insert 10, so that the fitting to the insert 10 can be performed manually without using a tool or the like. It is possible, and the operability of attaching the insert 10 to both the mold frames 20 and 25 can be improved.

Further, the flange 2 of the holder 1 is
The end face 10a of the insert 10 is slightly elastically deformed, so that the sealing property of the opening of the bottomed hole 11 of the insert 10 is improved, and the intrusion of the slag into the female screw 11a is reliably prevented, and the concrete molded product is formed. The occurrence of screw failure of the insert 10 at 31 is suppressed.

When the holder 1 is removed from the insert 10 or the inner frame 20, a hexagon wrench 35 is inserted into an opening formed by breaking the holder 1, and the hex wrench 3 is inserted.
5 rotates the holder 1. That is, hexagon wrench 35
Easily and securely insert the holder 1 into the insert 10
Alternatively, it is possible to remove the holder 1 from the insert 10 and the inner mold 20 because the work can be removed from the inner mold 20.

In the above embodiment, the insert 1
Although the case where 0 is embedded in the concrete molded product 31 in the horizontal direction has been described, the present invention can also be applied to the case where it is embedded in the vertical direction. In this case, the spacer 12 is not always necessary. Furthermore, the shape of the holder 1 in the above embodiment is not limited to the shape of each of the above embodiments, but is appropriately set according to the shape of the insert 10 to be used. Further, the material of the holder 1 is not limited to polyethylene, but may be a synthetic resin such as polypropylene, or a material such as rubber that breaks with a shear force of a predetermined value or more.

In this embodiment, the number of the peaks 5 is four. However, the number is not limited to four.
, And desirably four, six, or eight. The position is appropriately set according to the material of the holder 1, the size of the female screw 11a of the insert 10, and the like. Further, the ridge line 5a of the mountain portion 5 does not necessarily need to be sharp, and may have a rounded shape.

In the embodiment shown in FIG. 9, the tapered hole 2 provided in the insert mounting hole 21 of the inner mold 20 is provided.
1a abuts the tapered portion 2c of the flange portion 2 and the stepped portion 2 of the flange portion 2 contacts the holder contact surface 22c of the fixed nut 22.
b was in contact. However, as shown in FIG.
The holder 1 may be fixedly supported on the inner mold frame 20 by providing only the straight hole 21b without providing the hole 1a and making the step portion 2b of the flange portion 2 abut on the holder abutting surface 22c of the fixing nut 22. In this case, the end face 10 of the insert 10
a can be retracted and embedded from the surface of the concrete molded product 31. In addition, the tapered portion 2c of the flange portion 2
Concrete 30 is cast between the inner mold 20 and
Since the gap is small and thin, the concrete 30 clogged in the gap is removed together with the flange 2 at the time of demolding.

FIG. 16 is a sectional view showing a second embodiment of the insert holder according to the present invention. As shown in this embodiment, the holder 1 has a hollow cross-section, but has May be closed. FIG.
FIG. 7 is a sectional view showing a third embodiment of the insert holder according to the present invention. As in this embodiment, the end face on the insert mounting portion 4 side may be closed. That is, the broken portion 3
May be any structure as long as the section is hollow and a tool such as a hexagon wrench 35 can be inserted from the direction of the section H when the holder 1 is broken.

FIG. 18 is a front view showing a fourth embodiment of the insert holder according to the present invention, and FIG. 19 is a sectional view taken along the line KK in FIG. 5 may be formed such that the width of the insert mounting portion 4 in the outer peripheral direction is widened toward the break portion 3. The ridge line 5a of the peak 5 in the first and fourth embodiments extends linearly in the axial direction of the insert mounting portion 4, but is not necessarily limited to a straight line. The surface may extend spirally.

FIG. 20 is a front view showing a fifth embodiment of the insert holder according to the present invention.
Although a increases from the end of the insert mounting portion 4 toward the break portion 3, the peak portion 5 itself is formed intermittently. As described above, the peak 5 may be formed by a plurality of peaks.

FIG. 21 is a front view showing a sixth embodiment of the insert holder of the present invention, and FIG. 22 is a right side view in FIG.
A ridge 8 whose diameter is increased in the outer diameter direction from the outer peripheral surface is formed in the axial direction. In addition, the peak portion 8 is larger in diameter from the distal end side of the fixed nut mounting portion 6 toward the base end side. And
Four ridges 8 are formed at equal intervals in the outer circumferential direction of the fixed nut mounting portion 6. The width of the ridge 8 in the outer peripheral direction of the fixed nut mounting portion 6 is formed to be constant in the axial direction of the fixed nut mounting portion 6. Similarly to the insert mounting part 4, the peak part 8 is provided on the outer peripheral surface of the fixed nut mounting part 6 so that the fixed nut mounting part 6 can be self-tapped and the fixed nut mounting part 6 can be fixed.
May be fitted. The shape of the crest 8 is not limited to those shown in FIGS. 21 and 22, similarly to the crest 5 of the insert mounting part 4, and the screw is formed on the outer wall surface of the crest 8, and the fixing nut mounting part is formed. 6 may be used as long as it can fit the fixing nut 22.

In the first to sixth embodiments, the holder 1 has the female screw 11a
Are fitted. However, the insert mounting part 4
The female screw 11a may be slightly fitted into the holder 10. If the female thread 11a is slightly fitted, the insert 10 can be fitted into the holder 1 by hand without using a tool or the like. Similarly, the fixing nut attaching portion 6 of the sixth embodiment may be slightly fitted to the female screw 22a of the fixing nut 22.

[0048]

According to the first to fifth aspects of the present invention, even when a material having a predetermined strength is used, the holder is reliably broken by the relative movement between the mold and the concrete molded product. By doing so, the ease of demolding work is ensured. And even if the holder has a certain strength,
Since only the ridge is fitted to the female screw, it is possible to manually fit the insert without using a tool or the like,
The workability of attaching the insert to the mold can be improved.
According to the tenth aspect of the present invention, since the synthetic resin is used as the material of the holder, the same effects as those of the first to fifth aspects can be obtained.

According to the eighth aspect of the present invention, when the holder is removed from the insert or the mold, a tool is inserted into the opening made by breaking the holder, and the holder is rotated with the tool, so that the holder is easily rotated. It is possible to remove the holder. In particular, if the inner wall surface of the holder is formed in a hexagonal sectional view, the holder can be easily and reliably removed using a hexagon wrench, and the holder can be removed from the insert and the mold. Workability can be improved.

[Brief description of the drawings]

FIG. 1 is a front view showing a first embodiment of an insert holder of the present invention.

FIG. 2 is a left side view in FIG.

FIG. 3 is a right side view in FIG.

FIG. 4 is a sectional view taken along line AA in FIG.

FIG. 5 is a sectional view taken along line BB in FIG. 1;

FIG. 6 is a sectional view taken along line CC in FIG. 1;

FIG. 7 is a sectional view taken along line DD in FIG. 2;

FIG. 8 is a half sectional view showing a part of the insert holder of the present invention and a method of attaching the insert to a mold.

FIG. 9 is a cross-sectional view showing a part of a state in which the insert holder of the present invention is attached to a mold, in a half cross section.

FIG. 10 is a right side view in FIG.

11 is a sectional view taken along line EE in FIG. 10;

FIG. 12 is an enlarged view of a portion F in FIG. 9;

FIG. 13 is a fragmentary sectional view showing a state where the insert holder of the present invention is broken.

FIG. 14 is a cross-sectional view of a main part showing a state in which the insert holder of the present invention is removed from the mold and the insert.

FIG. 15 is a cross-sectional view in which a part of a modification of the state in which the insert holder of the present invention is mounted on a mold is a half cross section.

FIG. 16 is a sectional view showing a second embodiment of the insert holder of the present invention.

FIG. 17 is a sectional view showing a third embodiment of the insert holder of the present invention.

FIG. 18 is a front view showing a fourth embodiment of the insert holder of the present invention.

19 is a sectional view taken along the line KK in FIG.

FIG. 20 is a front view showing a fifth embodiment of the insert holder of the present invention.

FIG. 21 is a front view showing a sixth embodiment of the insert holder of the present invention.

FIG. 22 is a right side view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Insert holder 2 ... Flange part 2a ... Insert contact surface 2b ... Step part 2c ... Tapered part 3 ···················································································· Hexagonal hole 10 Insert 11 Bottomed hole 11a Female screw 20 Inner frame 21 Insert mounting hole 21a ····· Tapered hole 21b ····· Straight hole 22 ······ Fixing nut 22a ····· Female screw 22b ····· Guide part 22c ···· Holder contact surface 23・ ・ ・ ・ ・ ・ Welding 25 ・ ・ ・ ・ ・ ・ Outer frame 30 ・ ・ ・ ・ ・ ・ Concrete 31 ・ ・ ・ ・ ・ ・ Concrete molding

Claims (10)

[Claims] 1. An insert holder for holding an insert in a mold for embedding the insert in a concrete molded product, wherein the insert holder is fixed to the insert holder by a relative movement of the mold and the concrete molded product. A flange that is formed of a material that can be broken at a position, and has a disk-shaped flange, and a columnar insert mounting portion and a fixed nut mounting portion that are integrally provided on both side surfaces of the flange. On the side surface of the insert mounting portion side, an insert contact surface for contacting the opening side end surface of the insert is formed, and the outer peripheral surface of the insert mounting portion is made smaller in diameter than the inner diameter of the internal thread of the insert, By forming a ridge portion that is enlarged in the outer diameter direction from the outer peripheral surface in the axial direction, while increasing the ridge portion toward the base end side from the distal end side of the insert mounting portion, the ridge portion is formed. While forming a male thread in the middle of direction, the insert holder comprising screwed the insert into the insert mounting portion. 2. The insert holder according to claim 1, wherein the width of the crest portion in the outer peripheral direction is formed constant in the axial direction. 3. The insert holder according to claim 1, wherein a width of the peak portion in an outer peripheral direction is formed so as to increase toward a base end portion of the insert mounting portion. 4. The insert holder according to claim 1, wherein the peak portion is formed intermittently in an axial direction of the insert mounting portion. 5. The insert holder according to claim 1, wherein a screw is formed on the crest portion when the insert mounting portion is fitted to a female screw of the insert. 6. The insert holder according to claim 1, wherein the fixing nut mounting portion is formed by threading a male screw on an outer peripheral surface. 7. An outer peripheral surface of the fixed nut mounting portion has a diameter smaller than an inner diameter of a female screw of the fixed nut for fixing and supporting the holder to the mold frame, and expands in an outer diameter direction from an outer peripheral surface of the fixed nut mounting portion. The diameter of the crest is formed in the axial direction, and the diameter of the crest is increased from the distal end side to the base end side of the fixed nut mounting portion. The insert holder according to claim 1, wherein the fixing nut mounting portion is screwed to the fixing nut while forming the fixing nut. 8. The insert holder according to claim 1, wherein said insert holder has a hollow cross section. 9. The insert holder according to claim 8, wherein said insert holder has an inner wall surface formed in a hexagonal cross section. 10. The insert holder according to claim 1, wherein the insert holder is formed of a synthetic resin.