JPH0857826A - Insert and its mounting structure - Google Patents

Abstract

PURPOSE: To screw a bolt without a trouble by a method wherein a cap externally covering a screw hole is put on an insert having the screw hole, a separation brittle part is provided in the cap frontward of the screw hole, and the cap is separated at the brittle part by pulling a pulling lug from the external. CONSTITUTION: An insert 10 is composed of a main body 11 and a waterproof cover 15 covering one end thereof. The waterproof cover 15 is shaped in a bag form so as to cover a screw hole 11a provided in the main body 11 and elastically brought into close contact with the main body 11. A separation lid 16 is formed in the bottom of the waterproof cover 15 frontward of the screw hole 11a. A brittle part 17 having a diameter slightly larger than the screw hole 11a is formed along the periphery of the separation lid 16. The brittle part 17 is a thin-wall part coaxial to the screw hole 11a. A lug 16a is formed on the outer surface of the separation lid 16. By pulling the lug 16a, the separation lid 16 is separated from the separation cover 15 at the brittle part 17. Therefore, by separating the separation lid 16 after the insert 10 is placed in concrete, a bolt can be screwed into the screw hole 11a without a trouble.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insert buried in a member made of concrete such as a U-shaped groove used as a side gutter of a road or a wall material panel for construction.

[0002]

2. Description of the Related Art In general, inserts are provided with screw holes for screwing eyebolts or other bolts to concrete members, because it is difficult to make female threads directly on the concrete. It is practiced to embed the provided insert in a concrete member and open the screw hole provided in the insert in the wall surface of the concrete member for use.

That is, in the conventional insert, as shown in FIG. 5, the insert A is formed into a tubular shape having a screw hole B, and an outer surface thereof is provided with projections and depressions C for preventing it from being removed from the concrete member. Has been formed. To insert this into concrete, first, it is supported at a predetermined position in a predetermined posture by a bolt-shaped locking pin E protruding from the inner surface of the form D. After that, raw concrete is filled around the insert A. At that time, the cap F is lightly press-fitted so as to cover the screw hole B so that water containing cement or sand does not enter the screw hole B. S is a spacer attached to the bottom of the insert A, which is made by molding a soft synthetic resin.

When using the insert fitting, the applicant has previously proposed a method of using the hand tool to remove the cap F or to open a hole in the bottom thereof and then screw in the bolt J ( Actual Kaihei −
Issue). That is, as shown in FIG. 6, the cap F is provided with a fragile portion G having a substantially circular shape coaxial with the screw hole B. When the concrete member is used, the fragile portion G is used.
It is shown that the separation lid H surrounded by is pierced by an iron round bar or the head of a bolt J and pushed toward the screw hole B side to expose the screw hole B.

[0005]

However, the method of removing the cap F with a hand tool to expose the screw hole B has a problem that the work is complicated. When the head of the bolt J is pushed into the cap F to remove the separation lid H, when the bolt J is then pushed into the screw hole B, the separation lid H is pushed into the screw hole B, and ,
It was sometimes caught in the threaded portion between the screw hole B and the bolt J to stop the rotation of the bolt or make it heavy.

[0006]

In order to solve the above problems, the present invention comprises a main body having a screw hole and a waterproof cover attached to the outer surface of the main body to cover the screw hole.
The main body is covered with a waterproof cover made of an elastic material to seal the screw hole in a watertight manner, and the waterproof cover is provided with a separation lid located in front of the screw hole and surrounded by a fragile portion. The waterproof cover is made of an elastic material in the shape of a bag having an opening, and the inner circumference of the waterproof cover is made slightly smaller than the outer circumference of the main body. I have been dressed. Further, the outer surface of the separation lid is formed as a projecting surface having a central portion protruding outward, or the outer surface of the separation lid is formed with a projecting portion projecting outward at the central portion.

In order to attach the waterproof cover to the formwork, a support member for supporting the substantially cylindrical insert is attached to the inner surface of the formwork, and the support member has a support hole opened toward the inside of the formwork. While being provided, the main body of the insert is covered with a waterproof cover covering the screw hole, and the outer diameter of the waterproof cover is formed to be slightly smaller than the inner diameter of the support hole.

[0008]

[Function] The waterproof cover elastically adheres to the outer peripheral surface of the main body to seal the inside and outside of the screw hole. Further, in order to attach the insert to the mold, a support member is previously attached to the inside of the mold, and the head of the waterproof cover is pushed or hammered into the support hole formed in the end face of the head of the support member. As a result, the waterproof cover is squeezed at the edge of the support hole, and the outer diameter is reduced by the elasticity of the cover itself to fit the support hole. After that, concrete is poured into the inside of the formwork, but the separation lid formed on the waterproof cover is on the inner surface of the support member, and
Since it is covered by it, the earth pressure of the concrete poured into the formwork does not act directly. When the form is removed after the concrete has hardened, the support member and the waterproof cover are disengaged from each other and separated at the same time. When the formwork is removed,
The edge of the waterproof cover is exposed to the outside from the concrete member. When using the screw hole, if you pull the protrusion or projection of the separation lid strongly with a tool such as pliers, the separation lid will be cut at the fragile part and torn off, and the screw hole will appear there, and the separation lid It disappears when you go inside.

[0009]

The present invention will be described below with reference to the illustrated embodiments. In FIG. 1, 10 is an insert according to the present invention. The insert 10 is composed of a main body 11 and a waterproof cover 15 covering one end thereof, and is supported by a mold 12.

As shown in FIG. 7, the mold 12 is a substrate 12a.
And an inverted U-shaped fixed mold plate 12b that is fixed so as not to move, and a movable mold plate 12c that can be opened left and right separately. Movable template 12c
On the substrate 12a with the fixed mold plate 12b sandwiched between them
It is attached to both sides by 2d and can be tilted. Thus, when the left and right movable mold plates 12c are closed, a cavity 12e filled with concrete is formed between them and the fixed mold plate 12b.

A frusto-conical support member 13 made of iron or synthetic resin is fastened to the movable mold plate 12c by a bolt 13a and a nut 14 provided at one end. A support hole 13b formed of a circular hole is formed in the head end surface of the support member 13, and the insert 10 is attached by pressing the portion of the waterproof cover 15 therein.

As shown in FIG. 2, the insert main body 11 is made of cold-forged mild steel and has a bottomed bottom hole at one end thereof, and a female screw is engraved at a predetermined depth to form a screw hole. 1
1a. The closed end of the main body 11 is
A retaining flange 11b is formed on the outer surface, and the flange 11b is reinforced by four ribs 11c, 11c provided between it and the cylindrical outer surface. Thus,
When the main body 11 is embedded in a concrete member, a screw hole 11a opens on its wall surface, and a male screw of an eyebolt or other member is screwed into the main body 11. Main body 1 by its male screw
When a pushing or pulling force is applied to 1, the large area of the flange 11b withstands it.

The waterproof cover 15 is fitted on the outer surface of the main body 11 so as to cover the screw hole 11a. That is, the waterproof cover 15 is made of a synthetic resin having rubber-like elasticity and has a bag shape having an opening. The opening of the waterproof cover 15 is made slightly smaller than the outer surface of the main body 11. Thus, after the main body 11 is machined to form the screw hole 11a, the opening of the waterproof cover 15 is expanded to cover the outer surface of the main body 11, and the elastic force of the main body 11 allows the elastic cover 15 to adhere to or adhere to the screw hole. The inside and outside are sealed to prevent water from entering and leaving 11a.

At the bottom of the waterproof cover 15,
The separation lid 16 is set in front of the screw hole 11a,
A fragile portion 17 having a diameter slightly larger than that of the screw hole 11a is provided around the fragile portion 17.
Is set. The fragile portion 17 is formed as a circular thin-walled portion 17a provided coaxially with the screw hole 11a as shown in FIG. 3, or as shown in FIG.
It is formed as a circular slit 17b provided coaxially with a. Incidentally, 16a is a projection for pulling formed on the outer surface of the separation lid 16. Further, the protrusion does not necessarily have to be in this mode. For example, the separation lid 1
6 may be a conical surface whose center portion projects outward.

Thus, when the conical surface or the projection 16a is grasped with a tool such as pliers and pulled strongly, the separation lid 16 is separated from the waterproof cover 15 at the fragile portion 17, and the screw hole 11a is exposed at the mark. . Although the protrusion 16a is not always necessary in the configuration of the present invention, by providing the protrusion 16a, the work of pinching and tearing the separation lid 16 can be performed efficiently.

Next, the process of burying the insert 10 in concrete will be described. As described above, the support member 13 is attached to the form 12 in advance, and the waterproof cover 15 is first pushed into the support hole 13b opened at the top of the support member 13, or the insert 10 is pressed, or the flange 1 is hammered.
1b is tapped and driven to be fixed at a predetermined position and in a predetermined posture. At this time, even if the accuracy of the support hole 13b is slightly inferior, the waterproof cover 15 made of an elastic body is deformed, so that it can be easily pushed in or driven.

In this state, the form 12 is closed, and concrete slurry, that is, a mixture of cement, sand, water, etc., is poured into the inside. When the inside of the formwork 12 is filled with concrete, the outer surface of the insert 10 also comes into contact with the concrete slurry, but not only the slurry slurry but also the moisture containing cement that leaks from it is blocked by the waterproof cover 15 and does not reach the screw holes 11a. Absent.

When the concrete 12 is cured and the form 12 is opened, the waterproof cover 15 is pulled out from the support hole 13b.
Therefore, the main body 11 is left together with the waterproof cover 15 in a U-shaped groove formed by the mold 12 or a concrete product such as a panel. As described above, the waterproof cover 15 attached to the main body 11 has the protrusion 16a strongly pulled by a tool such as pliers immediately before the insert 10 is used, and the separation lid 1
6 is separated, the screw hole 11a is exposed to the outside, and a bolt or the like is screwed in for use.
It doesn't enter inside and is thrown outside. If the waterproof cover 15 is covered until just before the insert 10 is used in this manner, dust cannot enter the screw hole 11a and rust is unlikely to occur, which enables long-term storage.

Although the fragile portion 17 for separation is set to have the same diameter as or slightly larger than the screw hole 11a in this embodiment, it may be provided at a position corresponding to the outer surface of the main body 11. .

[0020]

As described above, according to the present invention, since the main body having the screw hole is covered with the waterproof cover from the outer surface so as to cover the screw hole, the fluid composition in the concrete flows into the screw hole. Is prevented. In addition, a fragile part for separation is set around the part that covers the screw hole of the waterproof cover, that is, around the separation lid, and it is easily separated by pulling this, and the required eyebolt etc. is planned for that hole. The bolt can be screwed. Further, since the separation lid is torn off from the waterproof cover to the outside, it does not enter the screw hole and does not hinder the screwing when the bolt is screwed into the screw hole. Further, since the insert 10 is fitted into the support hole of the supporting member supported by the mold via the waterproof cover, there is an effect that the outer diameter is contracted by the elastic force of the waterproof cover and the fitting is facilitated.

[Brief description of drawings]

FIG. 1 is a sectional view of a mold showing a state in which an insert according to the present invention is attached to the mold.

FIG. 2 is a partially cutaway side view of the insert shown with a part broken away.

FIG. 3 is a front view thereof.

FIG. 4 is a front view corresponding to FIG. 3 showing a modified example.

FIG. 5 is a cross-sectional view corresponding to FIG. 1 showing a state in which a conventional insert is attached to a form and is embedded in concrete.

FIG. 6 is an enlarged cross-sectional view showing an enlarged main part thereof.

FIG. 7 is a cross-sectional view of a mold.

[Explanation of symbols]

 10 ... Insert 11 ... Main body 11a ... Screw hole 11b ... Lock-out flange 11c ... Rib 12 ... Form 12a ... Substrate 12b ... Fixed mold plate 12c・ ・ ・ Movable template 12d ・ ・ ・ Rotating pin 12e ・ ・ ・ Cavity 13 ・ ・ ・ ・ Support member 13a ・ ・ ・ Bolt 13b ・ ・ ・ Support hole 14 ・ ・ ・ Nut 15 ・ ・ ・ ・ ・ ・ Waterproof cover 16・ ・ ・ Separation lid 16a ・ ・ ・ Pulling projection 17 ・ ・ ・ ・ Fragile part 17a ・ ・ ・ Circular thin wall part 17b ・ ・ ・ Missing circular slit A ・ ・ ・ ・ Insert B ・ ・ ・ ・ Screw Hole C ... ・ Unevenness to prevent coming off D ... Molding frame E ... ・ Locking pin F ・ ・ ・ ・ Cap G ・ ・ ・・ Bolt S ・ ・ ・ ・ Spacer

Claims (5)

[Claims] 1. A main body having a screw hole, and a waterproof cover attached to the outer surface of the main body to cover the screw hole. The main body is covered with a waterproof cover made of an elastic material to hermetically seal the screw hole. In addition, the insert in which the waterproof cover is provided with a separation lid located in front of the screw hole and surrounded by a fragile portion. 2. The waterproof cover according to claim 1, wherein the waterproof cover is made of an elastic material into a bag shape having an opening, and an inner circumference of the waterproof cover is slightly smaller than an outer circumference of the main body to expand the opening of the waterproof cover. An insert that is fitted to the outer surface of the insert in the open state. 3. The insert according to claim 1, wherein an outer surface of the separation lid is formed as a projecting surface having a central portion protruding outward. 4. The insert according to claim 1, wherein the outer surface of the separation lid is formed with a protrusion protruding outward in the center thereof. 5. A support member for supporting a substantially cylindrical insert is attached to the inner surface of the mold, and a support hole that opens toward the inside of the mold is provided in the support member, and a screw hole is formed in the main body of the insert. And an attachment structure in which the outer diameter of the waterproof cover is formed to be slightly smaller than the inner diameter of the support hole.