JPH06200565A - Buried fitting for concrete product and fixture therefor - Google Patents

Abstract

PURPOSE:To prevent concrete from flowing into an insert material at the time of forming the concrete. CONSTITUTION:A female thread section 4a is engraved on the inner surface of a fitting hole 4 for an insert material M to be buried and fixed at the time of forming concrete, and a coupling section 4b is formed for engagement with a fixture 7 and sealing the hole 4 at area other than the section 4a and nearer the opening side of the hole 4. Also, a fixture 7 for fitting the material M to the outer form 1a for concrete formation is provided with a support section 9 coupled to the section 4b for bearing the material M and a guide section 10 for guiding the body 3 of the material M to a position for engagement with the section 9. According to this construction, the insert material M is driven with a hammer in the condition where the body 3 can be guided to the position for engagement with the section 9, thereby coupling and supporting the sections 4b and 9. Thus, the fitting hole 4 is in sealed state and the inflow of concrete to the inside of the material M can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an embedding tool which is embedded and fixed in concrete when a concrete molded product such as a U-shaped groove is molded, and a mounting tool which supports the embedding tool. .

[0002]

2. Description of the Related Art Conventionally, in order to connect concrete molded products such as a plurality of U-shaped grooves in a row, a method of attaching a connecting tool to a predetermined portion of the molded product and connecting the two has been adopted. Then, in order to attach the connecting tool to the concrete molded product, a connecting insert material as an embedding tool having a cylindrical shape with a bottom and having female threads on all of its inner peripheral surface is opened on the side surface of the concrete product at the time of molding. Buried in. Then, a connecting tool having a female screw portion is screwed and fixed to the connecting insert material.

As a method of embedding and fixing the above-mentioned connecting insert material in a concrete molded product, for example, an insert material mounting tool as shown in FIG. 8 has been proposed. The fixture includes a core pin 31 for attaching the connecting insert material 30. The core pin 31 has a diameter slightly larger than the inner diameter of the female screw portion 30a of the connecting insert material 30 and has a columnar support portion 3 for externally fitting and supporting the core pin 31.
1a etc. are provided. Then, the core pin 31 is attached to the outer mold 34, which is rotatably assembled, of the concrete forming mold via a mounting bolt 32 and a nut 33.

Then, with both outer molds 34 open outward, the core pin 31 is previously connected to the insert material 30 for connection.
Is hammered in until the end surface 30b and the inner side surface 34a of the outer mold 34 are in close contact, and the mold 34 is rotated to a vertical position to inject concrete. Then, after the concrete molded product is formed by the solidification of concrete,
The mold 34 is rotated to both sides to open the mold, and at the same time, the core pin 31 is removed from the connecting insert material 30. In this way, the connecting insert material 30 is embedded and fixed in the concrete, and the concrete molded product is taken out from the mold.

Therefore, in the above-mentioned conventional example, the core pin 3 is used.
Since the fixture consisting of 1 and the mounting bolts 32 is fixed to the mold 34 by tightening, the fixture is opened at the same time when the mold is opened after molding.
Can be removed from. Therefore, it is possible to reduce the number of man-hours required for removing the core pin 31, and to easily attach the connecting insert material 30.

[0006]

However, when the concrete is poured into the core pin 31 of the above-mentioned fixture with the connecting insert material 30 attached, the concrete is completely prevented from entering the inside of the insert material 30. There is a problem that you cannot do it.

That is, the connecting insert material 30 has a female screw portion 30a threaded on the entire inner periphery thereof, and when the insert material 30 is supported by the support portion 31a of the core pin 31, it is supported by the top portion of the female screw portion 30a. The outer peripheral surface of the portion 31a is in sliding contact. Therefore, the female screw portion 3
Compared to the state where there is no 0a, that is, the case where the inner peripheral surface of the connecting insert material 30 and the outer peripheral surface of the support portion 31a are in sliding contact, the sliding contact portion is smaller. For this reason, the concrete injected into the formwork has an end surface 30b of the insert material 30.
And the inner side surface 34a of the outer mold 34, and further gradually penetrates the sliding contact portion between the female screw portion 30a and the core pin 31 from the opening portion of the insert material 30 and penetrates into the inside thereof.

The present invention was made in view of the above problems, and an object thereof is an embedding tool for concrete products capable of reliably preventing concrete from entering the embedding tool during concrete molding. And to provide a fixture therefor.

[0009]

In order to solve the above problems, according to the invention of claim 1, an embedding tool which is embedded and fixed in a concrete product, and the embedding tool is attached to a mold for molding a concrete product. The embedding tool has a main body formed in a substantially cylindrical shape, a thread is threaded into a mounting hole of the main body, and the mounting hole is provided in the mounting hole closer to the opening than the thread. A fitting portion that is fitted to the fitting to seal the mounting hole, and the fitting is provided with a support portion that supports the embedding tool in a state of fitting with the fitting portion; And a guide portion that guides the main body of the plug-in tool to a fitting position with the support portion.

According to the second aspect of the present invention, there is provided a concrete product embedding tool which is attached to a fixture provided in a mold for molding a concrete product and fixed by being embedded in the concrete product, and has a substantially cylindrical shape. A thread is screwed into the mounting hole of the embedding device body to be formed, and a fitting portion is formed in the mounting hole on the opening side of the thread, which is fitted to the mounting tool and seals the mounting hole. .

According to a third aspect of the present invention, there is provided a fixture for a concrete product, which is provided in a mold for molding a concrete product and supports the fixture embedded and fixed in the concrete product. A support portion that fits and supports the device on the opening side thereof, and a guide portion that is provided on the support portion and that guides the embedding device to a fitting position with the support portion are provided.

[0012]

In the invention of claim 1 thus constructed, when the embedding tool is mounted on the mounting tool provided on the mold,
When the mounting hole of the embedding tool is inserted into the guide portion of the mounting tool, the fitting portion is guided to the fitting position with the support portion. Then, by hammering the embedding device main body with a hammer, the fitting part and the supporting part are fitted to each other, and the embedding device is supported by the supporting part. At this time, since the mounting hole of the implant is sealed by fitting,
The concrete injected during molding of the concrete product is blocked by the end face of the opening of the main body and does not enter the mounting hole.

According to the second aspect of the present invention, when the embedding tool is mounted on the mounting tool provided on the mold, the fitting section formed in the mounting hole of the mounting tool is fitted with the mounting tool. Supported by the state. At this time, since the mounting hole of the embedding tool is sealed by fitting, the concrete injected during molding of the concrete product is blocked by the end face of the opening of the main body and does not enter the mounting hole.

According to the third aspect of the invention, the embedding tool is guided to the fitting position with the supporting section by inserting the mounting hole of the embedding tool into the guide portion of the mounting tool provided in the mold. . Then, the embedding tool is supported by the support portion by driving the embedding tool body with a hammer. At this time, since the embedding tool is fitted and supported by the support part of the fixture on the opening side, the concrete injected during the molding of the concrete product is dammed by the end face of the opening of the main body and attached. Does not enter the hole.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment embodying the present invention will now be described with reference to FIGS.
It will be described with reference to FIG. As shown in FIG. 2, the formwork 1 includes an inner formwork 1b forming an inner surface of a concrete molded product, and a pair of outer sides rotatably connected to both ends of the inner formwork 1b via a rotating shaft 2. It is composed of a mold 1a. A molding space S is formed when the molds 1a and 1b are closed, and concrete C is poured into the molding space S to form a channel-shaped concrete molded product. This molded product is used as a U-shaped groove.

As shown in FIGS. 1 and 3, an insert material M, which is an embedment tool embedded in a concrete molded product, has a main body 3 made of nylon resin and formed into a cylindrical shape with a bottom. A female screw portion 4a is threaded from the inner depth of the mounting hole 4 to the vicinity of the opening. A connecting tool such as a bolt (not shown) for connecting a plurality of U-shaped grooves in a row is screwed and fixed to the female screw portion 4a. or,
From the starting end of the female screw portion 4a of the mounting hole 4 to the opening-side end surface 3a
A fitting portion 4b having an opening larger than the inner diameter of the female screw portion 4a is formed on the. The inner diameter of the fitting portion 4b has such a length that when the insert material M is mounted on a mounting tool 7 to be described later, it can be fitted to the supporting portion 9 of the core pin 8 provided on the mounting tool 7. Further, the depth T from the starting end of the female screw portion 4a of the fitting portion 4b to the opening end surface 3a is 3 mm (in this embodiment), and the insert material M does not easily come off in the state of being fitted with the core pin 8. Have a length. It should be noted that plate-like movement preventing fins 6 projecting toward the base end side are formed at four locations on the outer periphery of the main body 3 to prevent the insert material M from rotating and shifting in the concrete C after being buried. ing.

As shown in FIG. 1, a fixture 7 for embedding the insert material M in concrete C is supported, for example, on the outside of both outer molds 1a. The fixture 7 includes a core pin 8 including a support portion 9 on the outer mold 1a side and a guide portion 10 formed on the tip side of the support portion 9. The support portion 9 has a diameter slightly larger (about 0.2 mm in this embodiment) than the inner diameter of the fitting portion 4b of the main body 3, and
It is formed in a disc shape having a thickness W that is the same length as the depth (3.0 mm) T of the fitting portion 4b. A taper portion 9a is formed at the tip of the support portion 9.

The guide portion 10 is formed in a cylindrical shape having the same diameter as the inner diameter of the female screw portion 4a and thicker than the thickness W of the fitting portion 4b. Further, the supporting portion 9
The tapered portion 10a is formed similarly to the above. Then, the mounting bolt 11 is inserted through the insertion hole 12 formed in the core pin 8 and the support hole 13 formed through the outer mold 1a, and is fixed by tightening the nuts 14a and 14b.
The core pin 8 is attached to the outer mold 1a. A washer 16 and a spring washer 17 are interposed between the outer mold 1a and the nut 14a.

The insert material M is guided to the fitting position with the support portion 9 by inserting the mounting hole 4 of the main body 3 into the guide portion 10 of the core pin 8. At this time, in the insert material M, the female screw portion 4a and the guide portion 10 are in sliding contact with each other. In this state, the insert material M is supported by the core pin 8 by fitting the fitting portion 4b and the support portion 9 by hitting the body 3 with a hammer. At this time, insert material M
The end surface 3a of the main body 3 is in close contact with the inner side surface 1c of the outer mold 1a. Therefore, when pouring concrete, the end surface 3a
And concrete C that has penetrated into the inner surface 1c of the outer mold 1a
Is blocked by its end face 3a so as not to enter the female screw portion 4a in the mounting hole 4.

Further, in a state where the insert material M is supported by the support portion 9, the insert material M is not easily separated from the core pin 8 due to an external impact or the like. Furthermore, core pin 8
The overall thickness is shorter than the depth of the mounting hole 4 of the main body 3, and after the concrete product is molded, the outer formwork 1a is rotated laterally so that the core pin 8 can be easily separated from the insert material M. It has become.

Next, the operation of the insert material M and the fixture 7 having the above structure will be described. As shown in FIG. 4, the pair of outer molds 1a are rotated in both directions about each rotation shaft 2, and in that state, the core pins 8 are set so as to correspond to the support holes 13 of the outer mold 1a. Insert the mounting bolt 11. Subsequently, the washer 16 and the spring washer 17 are inserted into the mounting bolt 11 and the nuts 14a and 14b are screwed together, whereby the core pin 8
Is fastened and fixed to the outer mold 1a. Then, after the female screw portion 4a of the main body 3 is externally fitted to the guide portion 10 of the core pin 8,
Then hit the surface with a hammer. Then, insert material M
Is pushed while being guided by the guide portion 10, and the fitting portion 4b and the support portion 9 are fitted and supported by the core pin 8. At this time, since the support portion 9 is provided with the tapered portion 9a,
The fitting with the fitting portion 4b is smoothly performed. Further, the opening-side end surface 3a of the main body 3 comes into close contact with the inner side surface 1c of the outer mold 1a.

Next, as shown in FIG. 5, both outer molds 1a.
Rotate inward to the vertical position. Then, in this state, the concrete C is poured into the molding space S from above. At this time, the concrete C that has penetrated between the end surface 3a and the inner surface 1c of the outer mold 1a is blocked by the end surface 3a and does not enter the female screw portion 4a in the main body 3. Next, as shown in FIG. 6, after the concrete C is solidified, the outer mold 1a is rotated to both sides to open the mold. At this time, since the core pin 8 fixed to the outer mold 1a moves together with the mold 1a, it is separated from the insert material M held in the concrete C at the same time when the mold is opened. Further, since the thickness of the core pin 8 is shorter than the depth of the mounting hole 4, the core pin 8 is smoothly separated from the insert material M.

Then, by lifting the concrete molded product P, the molded product P becomes an outer mold 1a and an inner mold 1b.
Released from. As described above, in this embodiment,
Even if the concrete C penetrates between the end surface 3a of the main body 3 and the inner side surface 1c of the outer mold 1a, the fitting portion 4b of the main body 3 and the support portion 9 of the core pin 8 are fitted to each other. It is possible to reliably prevent the concrete C from entering the material M.

Further, since the core pin 8 is provided with the guide portion 10, when the insert material M is hammered into the core pin 8, the fitting portion 4b of the body 3 is supported by the support portion 9 of the core pin 8.
You can smoothly guide. Further, by forming the tapered portion 9a on the supporting portion 9, the fitting with the fitting portion 4b is smoothly performed.

Further, since the core pin 8 is detached from the insert material M at the same time as the mold opening of the outer mold 1a, it is not necessary to remove the fixture 7 from the outer mold 1a each time after the concrete molding, and the number of working steps is reduced. Can be reduced.

The present invention is not limited to the above embodiments, but may be modified as follows without departing from the spirit of the present invention. (1) In the above embodiment, the female screw portion 4a is threaded from the inner rear portion of the mounting hole 4 of the main body 3 to the vicinity of the opening. However, for example, even if the female screw portion 4a is screwed only on the inner rear portion. Good. (2) In the above embodiment, the tapered portion 10a is formed at the tip of the guide portion 10 of the core pin 8, but the entire taper portion 1 is tapered so as to be tapered from the base end to the tip of the guide portion 10.
It may be 0a. (3) The inner diameter and depth T of the fitting portion 4b of the main body 3 may be changed according to the diameter and thickness W of the support portion 9 of the core pin 8. Conversely, the diameter or thickness W of the support portion 9 of the core pin 8 may be changed according to the inner diameter or depth T of the fitting portion 4b of the main body 3.

[0027]

As described above in detail, according to the present invention, there is an excellent effect that it is possible to prevent the infiltration of concrete into the interior of the embedding tool during concrete molding.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a state in which a fixture according to an embodiment of the present invention is assembled to a mold.

FIG. 2 is a partially cutaway sectional view showing a state where a concrete molded product is molded by a mold.

FIG. 3 is likewise an exploded perspective view showing a state in which the insert material is fitted to the core pin.

FIG. 4 is a sectional view showing a state in which the insert material is fitted to the core pin.

FIG. 5 is likewise a sectional view showing a state where a concrete molded product is molded by a mold.

FIG. 6 is likewise a partial cross-sectional view showing a state in which a concrete molded product is taken out from a mold.

FIG. 7 is a partially cutaway sectional view showing a state in which an insert material is fitted to a core pin of another embodiment.

FIG. 8 is a partially cutaway sectional view showing a state in which an insert material is fitted to a core pin of a conventional example.

[Explanation of symbols]

1a ... Outer form, 3 ... Main body, 4 ... Mounting hole, 4a ... Female screw part as screw thread, 4b ... Fitting part, 7 ... Fixing tool, 9 ... Supporting part, 10 ... Guide part, M ... Embedding tool As an insert material.

Claims (3)

[Claims] 1. An embedding tool which is embedded and fixed in a concrete product, and a mold (1) for molding the embedding tool into the concrete product.
A mounting tool for mounting to a), wherein the embedding tool has a main body (3) formed in a substantially cylindrical shape, and a thread (4a) is screwed into a mounting hole (4) of the main body (3). Then
A fitting portion (4) that fits the fitting to the mounting hole (4) closer to the opening than the screw thread (4a) to seal the mounting hole (4).
b), and the attachment is provided on the support (9) for supporting the implant in a state of being fitted to the fitting part (4b), and the fixture is provided on the support (9). An embedding tool for concrete products, which comprises a main body (3) and a guide portion (10) for guiding the main body (3) to a position where the main body (3) is fitted to the support portion (9), and an attachment thereof. 2. A formwork (1a) for molding a concrete product.
An embedding tool for concrete products, which is attached to a mounting tool (7) provided on a base plate and fixed by being embedded in a concrete product, wherein the mounting hole (4) of the substantially cylindrical embedding body (3) is screwed. The thread (4a) is threaded, and the mounting hole (4) is fitted into the mounting hole (4) closer to the opening than the thread (4a) to seal the mounting hole (4). An embedding tool for concrete products, characterized in that a joint portion (4b) is formed. 3. Formwork (1a) for molding concrete products.
A fixture for a concrete product embedding tool that supports an embedding tool (M) that is installed in and fixed to a concrete product, the fitting tool supporting the embedding tool (M) on the opening side thereof. And a support part (9) for supporting the implant (I) provided on the support part (9).
(10) for guiding the guide to the fitting position with the support (9)
An embedding device for an embedment for a concrete product, which is provided with.