JPH063042Y2 - Architectural inserts - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention relates to a building insert that is pre-embedded in a concrete slab in order to attach a hanging bolt or the like for suspending a ceiling material or the like to the concrete slab. Is.

(Prior art and its problems) This type of insert requires a screw hole for screwing the suspension bolt or the like, but in the conventional insert of this type, the screw hole is formed by a molding step of the main body. Had to be formed by another screw hole cutting process. Therefore, there is a drawback that the equipment for cutting the screw holes and the processing time are required, and the cost becomes high.

In order to eliminate such a problem, a wire is spirally wound in a tight contact to form a screw hole inside to form a tubular body, and the upper end of the tubular body is closed with a cap. A coil insert in which a fixing hole with a nail hole or a nail is attached to the lower end portion of the tubular body is known, for example, from Japanese Utility Model Publication No. 35-11153, but in the conventional coil insert, Since the wire rod was simply spirally wound around a wire with a circular cross section, the cross-sectional shape of the screw thread formed inside was arc-shaped, and the valley was extremely shallow, The width was extremely narrow.

Therefore, the strength of the screw connection with the suspension bolt screwed into the tubular body becomes very low, which causes a problem in safety.
Also, similarly, it is to join with concrete using the screw thread-shaped unevenness formed on the outer surface of the cylindrical body, but this joint strength is also low, and it is impossible to withstand heavy loads at all. Become.

Therefore, it was considered to form a large-diameter bulge on the upper end side in the length direction of the tubular body, but in a tubular body configured by using a wire having a circular cross section, no gap is created between the wires. However, if the winding radius is increased, it is not possible to form a large-diameter bulging portion that can remarkably increase the pull-out strength of the tubular body. If this is dared to be realized, a large-diameter bulging portion having a required diameter cannot be formed unless the overall length of the tubular body is sufficiently long, which is not practical.

(Means for Solving Problems) The present invention proposes an architectural insert capable of solving the above-mentioned conventional problems, which is characterized by a tubular body and a tubular body of the tubular body. In a building insert comprising a cap that closes the upper end and a nail hole or a fixing collar with a nail attached to the lower end of the tubular body, the tubular body has a flat surface on both upper and lower sides, and A wire rod with a horizontally long cross-section that is long in the left-right direction is formed by spirally winding the flat surfaces in close contact with each other so that the tips are inside. In addition, a large-diameter bulge portion is formed on the upper end side in the length direction of the tubular body, in which the winding radius of the wire rod is increased within a range in which no gap is formed between the wire rods.

(Embodiment) An embodiment of the present invention will be described below with reference to the attached exemplary drawings.

In FIGS. 1 and 2, 1 is a cylindrical body, 2 is a cap, and 3 is a fixing collar. As shown in FIG. 3, the cylindrical main body 1 has flat surfaces 4 formed on both upper and lower sides, and a tip portion 5 having a screw thread shape in a longitudinal cross section formed on one of the left and right sides.
A wire rod 6 having a horizontally long cross section that is long in the left-right direction is spirally wound so that the flattened surfaces 4 are in close contact with each other with the tip 5 inside, and the wire rod 6 is spirally wound. The pointed portion 5 serves as a screw thread, and a screw hole 7 penetrating in the axial direction is formed.

Reference numeral 8 denotes a large-diameter swelling portion formed on the upper end side in the lengthwise direction of the tubular main body 1, and increases the winding radius of the wire rod 6 to such an extent that no gap is formed between the vertically adjacent wire rods 6. By doing so, they are integrally formed. In addition, the cylindrical main body 1 of this embodiment
The diameters of both lengthwise end portions are smaller than and equal to the large diameter bulging portion 8.

The cap 2 is fixed by fitting a protruding portion 9 concentrically provided on the lower side of the cap 2 tightly inside the upper end portion of the screw hole 7. Of course, the cap 2 may be externally fitted and fixed to the upper end of the tubular body 1. The fixing collar 3 is provided with a screw hole 11 which is screwed into the spiral uneven outer peripheral surface 10 of the cylindrical main body 1, and a nail hole 12 is provided at an appropriate position on the periphery, and the screw hole 11 is used. And is screwed and fixed to the lower end of the tubular body 1. Of course, the fixing method of the fixing collar 3 to the cylindrical main body 1 is not limited to the above method, and it is also possible to fix the fixing collar 3 with an adhesive, for example. Further, although the nail hole 12 is provided, the nail can be fixed in advance.

In the insert of the present invention constructed as described above, as shown in FIG. 4, the fixing brim 3 is placed on the upper surface of the concrete formwork plate 13, and the nail 14 passed through the nail hole 12 is driven into the formwork plate 13. To fix it in place. As a result, the screw hole 7 is closed by the cap 2 and the form frame plate 13, and the wire 6 is in close contact with each other without a gap. Therefore, even if concrete is placed on the form frame plate 13, the concrete mortar does not have a screw hole. There is no intrusion into 7.

Since the formwork plate 13 is removed after the concrete is cured and cured, as shown in FIG.
Can be bent to the side. However, the tubular body 1
Is in close contact with the constructed concrete slab 15 on the spiral uneven outer peripheral surface 10 including the large-diameter swelled portion 8, so that the axial adhesion strength (pull-out strength) to the concrete slab 15 is very high. large.

In the insert thus embedded in the concrete slab 15, the upper end screw shaft portion 16a of the hanging bolt 16 can be screw-fitted into the screw hole 7 having the lower end opened, as shown in FIG. I can.

(Operation and effect of device) The building insert of the present invention, which can be carried out and used as described above, has a large diameter bulging for screw holes and anchors only by spirally winding a wire rod in a close contact state. And a screw groove cutting step for forming the screw hole is unnecessary. Therefore, the equipment and processing time for cutting the screw groove are not required, and the cost can be reduced. However, the greatest effect of the present invention is as follows. That is, A. As the wire rod constituting the tubular main body, a wire rod having a laterally long cross-sectional shape, which has a flat surface on both the upper and lower sides and which has a tip portion having a screw thread shape in a vertical cross section on one of the left and right sides, is used. Since the cylindrical body is constructed by spirally winding the wire material so that the flat surfaces are in close contact with each other so that the tips are on the inner side, the screw thread of the axial screw hole formed in the cylindrical body is formed. Will be formed by the screw thread-shaped tip of the wire rod, and therefore, the axial coupling strength (pull-out strength) with the hanging bolt or the like screwed into the screw hole can be sufficiently increased.

B. Then, on the upper end side in the longitudinal direction of the tubular main body, a large-diameter bulging portion is formed in which the winding radius of the wire rod is increased within a range where a gap does not occur between the wire rods. Since it has a long horizontally long cross-sectional shape, it is possible to make a large amount of laterally (diametrically) shifting between vertically adjacent wire rods. Therefore, the diameter of the large-diameter bulging part to be formed can be increased without increasing the overall length of the tubular body, so that the increase in cost can be minimized and the bond strength (pull-out strength) to concrete can be reduced.
Can also get enough inserts.

Thus, since the large-diameter bulging portion is formed, the screw coupling length between the cylindrical main body and the hanging bolt becomes short, but due to the screw thread formed at the tip of the wire as described above. Since the axial coupling strength (pulling-out strength) with the hanging bolt or the like that is screwed into the tubular body can be sufficiently increased, the cost can be reduced and the safety is very high. We were able to obtain inserts.

[Brief description of drawings]

Fig. 1 is a partial vertical side view, Fig. 2 is a bottom view, Fig. 3 is a vertical perspective view of the wire to be used, Fig. 4 is a side view in the state of being attached to a concrete form board, and Fig. 5 is a suspension. It is a partially longitudinal side view in the use condition which screwed the bolt. DESCRIPTION OF SYMBOLS 1 ... Cylindrical body, 2 ... Cap, 3 ... Fixing brim, 4 ... Flat surface, 5 ... Cross-section screw-shaped tip, 6 ... Wire rod, 7 ... Screw hole, 8 ... Large diameter bulging part, 10 ... Spiral uneven outer peripheral surface, 1
2 ... nail holes, 13 ... concrete form board, 14 ... nails, 15
… Concrete slabs, 16… Hanging bolts.

Claims (1)

[Scope of utility model registration request] 1. An architectural insert comprising a tubular body, a cap for closing the upper end of the tubular body, and a nail hole or a fixing collar with a nail attached to the lower end of the tubular body. The tubular body has a horizontally elongated cross-section shaped wire rod having vertical planes on both upper and lower sides and a screw thread-shaped sharp end portion on one of the left and right sides so that the sharp end portion is on the inner side. Is formed by spirally winding the flat surfaces in close contact with each other, and on the upper end side in the longitudinal direction of the tubular main body,
An architectural insert comprising a large-diameter bulged portion formed by enlarging the winding radius of the wire rod within a range where no gap is generated between the wire rods.