JP2004197326A - Insert embedding method, set boss, and insert - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate the attachment and detachment of an insert to and from a form and to positively fix the insert to a set boss so as not to come off easily by an impact in placing concrete or vibration in compaction. <P>SOLUTION: Threads are formed at the outer periphery of a boss of the set boss and the inner periphery of an insert opening. When pressing the insert to the boss while rotating, the threads thereby work as guides to facilitate setting. When removing the insert from the form, the boss is forcibly pulled out of the insert using the elasticity of the insert without rotating the boss. Consequently, when the form is separated from the concrete face, the boss comes off from the insert at the same time. Workability is thereby excellent. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an insert to be embedded in concrete for various purposes such as forming a drain hole, lifting a concrete product, and the like, an embedding method thereof, and a set boss for attaching the insert to a mold.
[0002]
[Prior art]
When the insert is mounted on a mold, the most common method is to form a screw on the inner peripheral surface of the insert as disclosed in Japanese Utility Model Publication No. Sho 57-10808 and Japanese Patent Laid-Open No. It is a method of screwing a bolt from outside. In this case, after the concrete is cast and hardened, the bolt is turned to remove it, and then the mold is removed and the mold is removed.
[0003]
In Japanese Patent Application Laid-Open No. Hei 7-216996, a set boss is fixed to a mold so that a plastic tubular boss protrudes from the inner surface of the mold, and a mouth of a tubular insert is fitted to the boss. A technique is disclosed in which concrete is poured into a mold, hardened, and then the boss is separated from the concrete surface together with the mold, and the boss is removed from the insert at the same time as the mold is removed from the mold.
[0004]
[Problems to be solved by the invention]
In the former case of the prior art, while the insert can be securely fixed to the mold by the bolt, when the insert is attached to the mold, the bolt must be turned outside the mold while holding the insert inside the mold. . If the formwork is large, two workers must work simultaneously inside and outside the formwork. When removing the mold, the bolt must be removed before turning the mold. Therefore, there has been a problem that work efficiency is extremely poor.
[0005]
In the latter case, when the mold is removed, the form is pulled away from the concrete surface, and at the same time, the boss portion comes off from the insert. However, it is difficult to push the insert into the boss if the insert and the boss are firmly fitted when the insert is attached to the mold (even if the insert is pushed with a strong force, it is pushed back by the elasticity of the boss). In some cases, the insert cannot be buried at a predetermined depth because the insert cannot be completely fitted. Also, if the insert's inner diameter and the outer diameter of the boss are “played” to make it easier to insert the insert, or if the boss is made of a deformable shape or soft material, the impact and compaction of concrete casting will occur. There is a problem that the insert is likely to come off from the boss portion due to the vibration at that time, and a concrete toro enters the insert (toro leakage).
[0006]
The present invention solves the above-mentioned conventional problems, and facilitates the installation of the insert to the mold and the removal of the mold, as well as the secure fixing of the insert to the set boss, and the impact during compaction and compaction. The object of the present invention is to make it difficult to come off even by vibration and to prevent toro leakage.
[0007]
[Means for Solving the Problems]
The invention of claim 1 of the present application is directed to fixing a set boss having a cylindrical boss portion having a thread on an outer periphery thereof to a mold so that the boss protrudes from the inner surface of the mold, and attaching the boss to the boss portion. A plastic cylindrical insert having a thread corresponding to the thread of the part on the inner periphery of the mouth is fitted, concrete is poured into the formwork, and after hardening, the boss is not forcibly removed without rotating. The method of embedding an insert is characterized in that the insert is removed from the insert.
[0008]
The invention according to claim 2 of the present application is the insert embedding method according to claim 1, wherein the thread of the boss portion is 0.8 to 1.2 turns, and the lead angle is 4.0 to 10.0. ° in which the insert is embedded.
[0009]
The invention of claim 3 of the present application is a set boss having a cylindrical boss portion having a thread on an outer periphery, the boss portion being fixed to a mold so as to protrude from the inner surface of the mold, and being provided on an inner peripheral surface of a mouth portion. The mouth of the plastic insert having a thread corresponding to the thread of the boss portion is fitted to the boss portion to attach the insert to the formwork, and after the concrete is cast and cured, the boss portion is rotated. The set boss is characterized in that the set boss can be pulled out of the insert by forcible pulling without performing.
[0010]
According to a fourth aspect of the present invention, in the set boss of the third aspect, the thread of the boss portion is 0.8 to 1.2 turns and the lead angle is 4.0 to 10.0 °. It is a set boss characterized by the following.
[0011]
The invention according to claim 5 of the present application is directed to a set boss having a cylindrical boss portion having a thread on an outer periphery thereof, wherein the boss portion of the set boss fixed to the mold so that the boss projects to the inner surface of the mold. A plastic cylindrical insert that is attached to the formwork by fitting the mouth portion, and has a thread corresponding to the thread of the boss portion on the inner peripheral surface of the mouth portion, and after casting concrete, after hardening, An insert characterized in that the boss can be removed from the insert by forcible removal without rotating.
[0012]
The invention according to claim 6 of the present application is the insert according to claim 5, wherein the thread has 0.8 to 1.2 turns and a lead angle is 4.0 to 10.0 °. Insert.
[0013]
The invention according to claim 7 of the present application is the insert according to claim 5 or 6, wherein a metal rod is provided inside the insert in the diameter direction, and both ends of the rod penetrate the cylindrical wall of the insert body. An insert protruding outside.
[0014]
According to the invention of claim 8 of the present application, a set boss (32) having a cylindrical boss portion (5) having an annular ridge (33) on the outer periphery is formed such that the boss portion (5) projects to the inner surface of the mold (14). The boss portion (5) is made of plastic having an annular groove (31) corresponding to the annular ridge (33) of the boss portion (5) on the inner periphery of the mouth portion. The concrete insert is cast into a formwork (14), and after hardening, the boss (5) is removed from the insert (30). It is a method of incorporation.
[0015]
According to the invention of claim 9 of the present application, the boss (5) of the set boss (32) having the cylindrical boss (5) having the annular ridge (33) on the outer periphery projects to the inner surface of the mold (14). The boss (5) of the set boss (4) fixed to the mold (14) is fitted with a mouth by a plastic tubular insert (30) attached to the mold (14). There is an annular groove (31) corresponding to the annular ridge (33) of the boss (5) on the inner peripheral surface of the mouth, and after the concrete is cast and hardened, the boss (5) is inserted. An insert (30) characterized in that it can be pulled out of the insert (30).
[0016]
According to a tenth aspect of the present invention, in the insert (30) of the ninth aspect, a metal rod (3) is provided inside the insert (30) in a diametrical direction, and both ends of the rod (3) are provided. The insert (30) characterized in that the insert (30) penetrates the cylindrical wall of the insert main body and projects outside.
[0017]
In the present invention, since the thread is formed on the inner periphery of the boss portion and the insert opening portion, the insert is rotated even if the inner diameter of the insert and the outer diameter of the boss portion are firmly fitted by reducing or eliminating the "play" of the outer diameter of the boss portion. By pushing in while inserting, the screw serves as a guide, the insert can be easily pushed in, and the insert and the boss can be completely fitted. Therefore, it does not easily come off due to the impact of concrete casting or vibration during compaction, and the problem of toro leakage can be solved.
[0018]
When the insert is pushed into the boss, the threads of the boss and the insert opening are set to 0.8 in order to use the threads as a guide and to facilitate the forcible removal when the boss is pulled out of the insert. The lead angle of the screw is 4.0 to 10.0 °, which is considerably larger than that of a normal screw. Further, the height of the convex thread and the depth of the groove of the concave thread are suitably about 0.3 to 1 mm.
[0019]
Also, in the present invention, since an annular ridge is provided on the outer periphery of the boss portion and an annular groove is provided on the inner periphery of the insert opening portion, when setting the insert in the boss portion, a strong force is required, such as hitting with a mallet. However, if the one end is set, the annular ridge and the annular concave groove are fitted, and the insert is not pushed back from the boss portion, so that the insert can be embedded at a predetermined position and a predetermined depth. Furthermore, it is hard to come off by the impact of concrete casting or the vibration during compaction, and the problem of toro leakage can be solved.
[0020]
When removing the mold, the elasticity of the plastic in the insert is used to pull out the insert by so-called forcible removal without rotating the boss, so pulling the mold away from the concrete surface allows the boss to be inserted at the same time. The workability is extremely good.
[0021]
In the insert of the present invention, a metal rod can be provided inside the insert in the diametric direction, and both ends of the rod can penetrate through the cylindrical wall of the insert body and protrude to the outside. When this insert is used as a lifting insert, the lifting load is transmitted directly from the metal rod to concrete by engaging the lifting member with the metal rod and lifting up the concrete product. No lifting load acts on the insert body. Therefore, even if the insert body is made of plastic, there is no risk of breakage, and the insert body can have strength equal to that of a metal insert.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings related to the embodiments. 1 is a side view of the insert 1 according to the embodiment, FIG. 2 is a sectional view taken along line AA in FIG. 1, FIGS. 3 to 5 are explanatory views of the insert 1 and the set boss 4, FIG. 6 is a plan view of the washer 11, and FIG. Is a front view and a side view of the hanging member 16, and FIG. 8 is a cross-sectional view of the insert 24 according to the embodiment.
[0023]
The insert 1 is embedded in the concrete product in order to lift the concrete product. The main body is made of plastic and has a substantially cylindrical shape, the inside is a cylindrical cavity, and a concave thread 2 is formed on the inner periphery of the mouth. Have been. The concave thread 2 has about one turn, the lead angle is 4.9 °, and the depth of the groove is 0.5 mm. A metal rod 3 is provided inside the insert 1 in the diametric direction, and both ends of the rod 3 penetrate the cylindrical wall of the insert body and protrude to the outside.
[0024]
The set boss 4 is for fixing the insert 1 to a formwork, is made of metal (made of zinc die-cast), and has a cylindrical boss portion 5 having a convex thread 6 on the outer periphery. The flange 7 is provided. The flange portion 7 is for recessing the insert 1 from the concrete surface by the thickness of the flange portion 7 and embedding it, and is formed only when necessary. The convex thread 6 has about one turn, the lead angle is 4.9 °, and the height of the convex thread is 0.5 mm. A hollow portion 8 is formed inside the distal end side of the set boss 4, and a bolt hole is provided in the base end surface. For example, as shown in FIG. 4, the set boss 4 is fixed to the mold 14 with the boss 5 protruding from the inner surface of the mold. A through hole is formed in this portion of the mold, a bolt 9 is inserted into the through hole and a bolt hole of the set boss 4, a washer 11 is provided on the outer surface of the mold, and a nut 10 is fastened and fixed. The bolt head is housed in the hollow part 8. As shown in FIG. 6, the washer 11 has a special shape in which the outer ends of eight legs 13 integrally formed radially on the upper surface of the disk 12 are bent downward and protrude, and the cushion of the legs 13 is provided. Due to its properties, it absorbs the vibration of the vibrator for compacting concrete. The set boss may be made of plastic, but if it is made of metal, it will have excellent durability.
[0025]
The insert 1 is attached to the mold by fitting its mouth to the boss 5 of the set boss 4 fixed to the mold 14. As shown by an arrow in FIG. 3, when the insert 1 is rotated while being pushed into the boss 5, the concave thread 2 of the insert and the convex thread 6 of the boss serve as a guide, and the insert moves backward as it rotates. The insert 1 and the boss 5 can be completely fitted as shown in FIG.
[0026]
When concrete is poured into the mold 14 and the mold is removed after curing, the mold 14 is separated from the concrete product 15 as shown by an arrow in FIG. The set boss 4 is separated from the concrete product 15 together with the formwork 14, and the boss portion 5 comes out of the insert by so-called forced removal without rotating.
[0027]
As shown in FIG. 5, both ends of the rod 3 of the insert 1 embedded in the concrete product 15 project outward from the insert body and are anchored to concrete. In order to lift the concrete product, for example, a hanging member 16 as shown in FIG. 7 is used. The suspension member 16 includes a shaft 17, a bearing 18, and a U-shaped portion 19. The shaft 17 is rotatably mounted on the bearing 18, and the U-shaped portion 19 is rotatably mounted on the bearing 18. ing. A hanging wire of a crane is hung on the U-shaped portion 19. A hook 20 is formed at the tip of the shaft 17, and the hook 20 is formed by a vertical groove 21, a horizontal groove 22, and a locking groove 23. The vertical groove 21 is formed vertically and diametrically so that the rod 3 of the insert 1 can enter from the distal end of the shaft 17 toward the base end. The horizontal groove 22 is formed horizontally following the vertical groove 21 so that the rod 3 can rotate a predetermined angle (45 ° in this case) after entering the vertical groove 21. The locking groove 23 is formed in a diametrical direction so as to be depressed downward from the lateral groove 22 so that the rod body 3 can be slightly moved to the distal end side (downward) of the shaft body 17 and locked after rotating by a predetermined angle. ing.
[0028]
When the concrete product 15 is lifted, the shaft 17 of the hanging member 16 is inserted into the insert 1, and the rod 3 of the insert 1 is engaged with the hook 20 by rotating the shaft 17 clockwise by a predetermined angle (45 °). Thereafter, when the concrete product 15 is lifted, the rod 3 is pushed into the locking groove 23 and locked by the weight of the concrete product, and the insert 1 and the hanging member 16 are relatively more firmly fixed. It becomes. Therefore, an accident that the hanging member 16 comes off the insert 1 can be completely prevented. When the hanging member 16 is removed from the insert 1, the shaft 17 is rotated counterclockwise by 45 °, and when the shaft 17 is pulled out upward, the rod 3 passes through the vertical groove 21 and the shaft 17 is inserted into the insert 1. Can be extracted from
[0029]
Since the suspending member 16 is engaged with the metal rod 3 and lifted, the load of the concrete product is directly transmitted to the concrete from both ends of the metal rod 3 and almost no load acts on the plastic insert body. do not do. Therefore, even if the main body of the insert 1 is made of plastic, there is no risk of breakage, and the insert 1 can have strength equal to that of a metal insert.
[0030]
FIG. 8 shows an example in which the present invention is applied to a general insert having a screw on the inner peripheral surface. The insert 24 has a screw 26 on the inner peripheral surface, and a one-turn concave thread 25 is formed on the inner peripheral surface of the mouth. The insert 24 can also be attached to a mold and removed from the mold in exactly the same manner as the insert 1 described above.
[0031]
When the insert is a lifting insert, it is preferable to provide a concave thread on the insert and a convex thread on the boss portion in order to insert a suspending member into the insert. In the case of an insert for draining water, it is perfectly acceptable to provide a convex thread on the insert and a concave thread on the boss.
[0032]
FIG. 9 is an explanatory view of the insert 30 and the set boss 32. The insert 30 is different from the insert 1 in that an annular groove 31 is formed on the inner periphery of the mouth, and the other configuration is the same. The set boss 32 is different from the set boss 4 in that an annular ridge 33 is formed on the outer periphery of the boss portion 5, and the other configuration is the same. In order to attach the insert 30 to the boss 5 of the set boss 32 attached to the formwork, the insert 30 is pushed with a strong force or hammered with a mallet or the like. Once attached, the annular ridge 33 and the annular groove 31 are fitted, and the insert 30 is not pushed back from the boss 5, so that the insert is buried at a predetermined position and a predetermined depth on the concrete surface. it can. Furthermore, since the annular ridge 33 and the annular groove 31 are fitted, the annular ridge 33 does not easily come off due to the impact of concrete casting or vibration during compaction, and the problem of toro leakage can be solved. When the mold is removed from the insert, as in the case of the insert 1 and the set boss 4, the mold is pulled out from the insert by so-called forcible removal without rotating the boss portion by using the elasticity of the plastic of the insert. By separating the boss from the concrete surface, the boss is simultaneously removed from the insert, and the workability is extremely good. The set boss may be made of metal or plastic. When made of metal, it has excellent durability and can be used many times while attached to the formwork. The use of plastic is inexpensive and excellent in elasticity, so that the attachment and removal of the insert are relatively easy.
[0033]
【The invention's effect】
In the present invention, since the thread is formed on the inner periphery of the boss portion and the insert opening portion, even if the insert is rotated even if the inner diameter of the insert and the outer diameter of the boss portion are reduced or eliminated to make a firm fit, the insert is rotated. By pushing while inserting, the screw serves as a guide, the insert can be easily pushed in, and the insert and the boss can be completely fitted. Therefore, it does not easily come off due to the impact of concrete casting or vibration during compaction, and the problem of toro leakage can be solved.
[0034]
Also, in the present invention, since the annular ridge is provided on the outer periphery of the boss portion and the annular groove is provided on the inner periphery of the insert opening portion, if one end is set, the annular ridge and the annular groove are fitted, and the insert is bossed. Since the insert is not pushed back from the part, the insert can be embedded at a predetermined position and a predetermined depth. Furthermore, it is hard to come off by the impact of concrete casting or the vibration during compaction, and the problem of toro leakage can be solved.
[0035]
When removing the mold, the boss is removed from the insert by so-called forcible removal without rotating the boss, using the elasticity of plastic.Therefore, the boss is detached from the insert at the same time by separating the mold from the concrete surface. Very good workability.
[0036]
In the insert of the present invention, when a metal rod is provided in the insert in the diameter direction, and both ends of the rod are projected outside through the cylindrical wall of the insert body, the insert is used for lifting. When used as an insert, the lifting load is transmitted directly from the metal rod to the concrete by engaging the hanging member with this metal rod and lifting the concrete product. No lifting load is applied. Therefore, even if the insert body is made of plastic, there is no risk of breakage, and the insert body can have strength equal to that of a metal insert.
[Brief description of the drawings]
FIG. 1 is a side view of an insert 1 according to an embodiment.
FIG. 2 is a sectional view taken along line AA in FIG.
FIG. 3 is an explanatory view for attaching an insert 1 to a mold 14;
FIG. 4 is a cross-sectional view showing a state in which the insert 1 is attached to the mold 14;
FIG. 5 is an explanatory view of removing the mold 14;
FIG. 6 is a plan view of the washer 11. FIG.
7 is a front view and a side view of the hanging member 16. FIG.
FIG. 8 is a cross-sectional view of the insert 24 according to the embodiment.
FIG. 9 is an explanatory view of an insert 30 and a set boss 32.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Insert 2 Screw 3 Rod 4 Set boss 5 Boss part 6 Screw 7 Flange part 8 Hollow part 9 Bolt 10 Nut 11 Washer 12 Disk 13 Leg 14 Formwork 15 Concrete product 16 Suspension member 17 Shaft body 18 Bearing part 19 U-shaped part 20 Hook-shaped part 21 Vertical groove 22 Horizontal groove 23 Locking groove 24 Insert 25 Thread 26 Screw 30 Insert 31 Annular concave groove 32 Set boss 33 Annular ridge

Claims (10)

A set boss (4) having a cylindrical boss portion (5) having a thread (6) on the outer periphery is fixed to the mold (14) such that the boss (5) projects from the inner surface of the mold (14). Then, a plastic cylindrical insert (1, 24) having a screw (2, 25) corresponding to the screw (6) of the boss (5) on the inner periphery of the mouth portion is provided on the boss (5). The insert is fitted and cast concrete in the formwork (14), and after hardening, the boss (5) is removed from the insert (1, 24) by forcible removal without rotating. Embedding method 2. The method of embedding an insert according to claim 1, wherein the thread (6) of the boss (5) has 0.8 to 1.2 turns and a lead angle of 4.0 to 10.0 degrees. Insert embedding method characterized by the above-mentioned. A set boss (4) having a cylindrical boss (5) having a thread (6) on an outer periphery thereof, wherein the boss (5) protrudes from the inner surface of the mold (14). And a screw (2, 25) corresponding to the screw (6) of the boss (5) on the inner peripheral surface of the mouth. 5), the inserts (1, 24) are attached to the formwork (14). After the concrete is cast and hardened, the inserts (1, 24) are forcibly removed without rotating the boss (5). Set boss (4) characterized in that it can be removed from 24) The set boss (4) according to claim 3, wherein the thread (6) of the boss (5) has 0.8 to 1.2 turns and a lead angle of 4.0 to 10.0 °. Set bosses characterized by the above (4) A set boss (4) having a cylindrical boss (5) having a thread (6) on its outer periphery is fixed to a mold (14) such that the boss (5) projects from the inner surface of the mold (14). A plastic tubular insert (1, 24) attached to the formwork (14) by fitting a mouth to the boss portion (5) of the set boss (4). It has a screw (2, 25) corresponding to the screw (6) of the boss (5), and after the concrete is cast and hardened, the boss (5) is inserted by forcible removal without rotating the boss (5). Insert (1, 24) characterized in that it can be removed from The insert (1, 24) according to claim 5, wherein the thread (2, 25) has 0.8 to 1.2 turns and a lead angle of 4.0 to 10.0 °. Inserts (1, 24) The insert (1) according to claim 5 or 6, wherein a metal rod (3) is provided in the insert (1) in a diametrical direction, and both ends of the rod (3) are connected to a cylindrical wall of the insert body. Insert (1) characterized by penetrating and projecting to the outside A set boss (32) having a cylindrical boss portion (5) having an annular ridge (33) on the outer periphery is attached to the mold (14) such that the boss (5) protrudes from the inner surface of the mold (14). A plastic cylindrical insert (30) having an annular groove (31) corresponding to the annular ridge (33) of the boss (5) on the inner periphery of the mouth is fixed to the boss (5). Inserting the concrete into the formwork (14) and, after hardening, removing the boss (5) from the insert (30). A set boss (32) having a cylindrical boss (5) having an annular ridge (33) on the outer periphery thereof is attached to the mold (14) such that the boss (5) projects from the inner surface of the mold (14). A plastic cylindrical insert (30) attached to the formwork (14) by fitting a mouth portion to the boss portion (5) of the fixed set boss (4). It has an annular groove (31) corresponding to the annular ridge (33) of the boss (5), and the boss (5) can be removed from the insert after the concrete is cast and hardened. Insert to do (30) The insert (30) according to claim 9, wherein a metal rod (3) is provided diametrically inside the insert (30), and both ends of the rod (3) penetrate the cylindrical wall of the insert body. (30) characterized in that the insert (30) is projected outside.

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