JP2006329309A - Driving type fastener for concrete and the like - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the fastening strength in a long fastener to fix a waterproof seat to the concrete. <P>SOLUTION: The fastener has a shaft 1 and a head 2 and the shaft 1 comprises the straight shaped first part 3, the taper shaped second part 4 and the shell shaped third part 5m, and the tapered part 6 is composed of the second part 4 and the third part 5. The relation of the length L1 of the first part 3, the length L2 of the second part 4 and the length L3 of the third part 5 is as L1>L2>L3. Furthermore, L2+L3 is set up as 20 mm or less and the biggest outside diameter D of the shaft 1 as 5 mm or less. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a drive-in fastener (which may be referred to as a nail or a pin with a head) used for fixing a workpiece made of a soft material to concrete. Here, concrete is a concept including a stone-like material such as brick or natural stone in addition to normal concrete (including ALC). Soft materials also include wood and thin metal plates.

  Asphalt-based waterproof sheets are often stretched on the rooftop surface of concrete buildings, and generally a heat insulating material is interposed between the waterproof sheet and the concrete slab (that is, the surface of the heat insulating material). A waterproof sheet is attached to the

As a method of fixing the waterproof sheet and the heat insulating material to the concrete slab, conventionally, for example, fixing by screws as shown in Patent Document 1 or an expansion type anchor as shown in Patent Document 2 has been used.
Japanese Patent No. 3416644 Japanese Patent Application Laid-Open No. 11-152859

  However, the conventional method using screws and anchors has a problem that it takes a lot of time to lay the waterproof sheet and the heat insulating material because it is necessary to drill a pilot hole in the concrete slab.

  On the other hand, as a fastener for fixing a metal plate cage frame for constructing a partition wall in a concrete building to a concrete slab, for example, a nail-like pin described in Japanese Patent No. 2588812 (common name: concrete pin) This pin is used by being loaded into a power driving tool using a gas combustion pressure that is simple and excellent in mobility. And if the fixing means which drives out a pin with a power type driving tool is diverted to the fixing means of the waterproof sheet, the construction efficiency can be remarkably improved.

  The pin used for fixing the partition frame has a shaft with an outer diameter of about 2.6 to 3.0 mm, but it is long in the case of a fastener for fixing a waterproof sheet. Therefore, it is preferable to make the diameter larger than that from the viewpoint of increasing the holding force (fastening strength, pulling resistance) and preventing buckling. However, simply increasing the outer diameter increases the driving resistance, but the power of driving the tool is constant, so there is a possibility that the head may float from the waterproof sheet without being driven sufficiently. In this regard, it is conceivable to use a gunpowder gun that shoots fasteners with the explosive force of gunpowder, but gunpowder guns have a problem of lack of versatility due to strict regulations.

  This invention makes it a subject to improve such a present condition.

  The inventor of the present application has completed the present invention by experimentally producing various types of fasteners and repeating experiments. That is, the present invention consists of a shaft and a head formed at one end of the shaft as a basic configuration. By forming a portion on the opposite side of the shaft from the head as a tapered portion, a soft sheet such as a waterproof sheet or a heat insulating material is formed. The work can be fixed to concrete.

  As a feature of the invention, the shaft includes a first part continuous to the head, a second part continuous to the first part, and a third part continuous to the second part and including the tip of the shaft. The first portion has a straight shape with the same outer diameter over the entire length, the second portion has a tapered shape in which the outer diameter is reduced at a constant ratio toward the third portion, and the third portion is The outer shape in the longitudinal sectional view is formed in a substantially shell shape that is curved outwardly while the outer diameter is reduced toward the tip. Therefore, the second portion and the third portion constitute the tapered portion. Further, the length L1 of the first portion, the length L2 of the second portion, and the length L3 of the third portion are set to have a relationship of L1> L2> L3. In this case, it is preferable to set L2 + L3 to 20 mm or less and set the maximum outer diameter of the shaft to 5 mm or less.

  The drive-in type fastener can fully exhibit the advantage of speeding up construction by using it in a power-type driving tool that uses gas combustion pressure or pneumatic pressure as a drive source. Thus, as a suitable form when used for a power driving tool, in claim 2, L2 + L3 is set to 15 to 18 mm, the outer diameter of the first portion is set to 3 to 4 mm, and the second portion is tapered. Is set to 5 to 7 °, and the curvature of the third portion is set to 20 to 26 mm.

  As a form of the driving fastener, a straight type in which only the tip portion of the shaft is tapered and the other majority is straight, for example, as described in JP-A-6-213220, a straight portion is used. A stepped type having two steps of a small diameter portion on the tip side and a large diameter portion on the head side is also conceivable. However, compared with these, the present invention product has a deep driving depth even when driven with the same power, and a high fastening force can be obtained. The reason for this has not been fully elucidated, but is presumed as follows.

  That is, when this type of fastener is driven by a normal gas type or pneumatic type, the amount of entry into the concrete is about 15 to 20 mm. Therefore, all or most of the tip of the fastener enters the concrete. However, the third part that plays a leading role in the concrete entry in the taper shape is a bullet-shaped, so that the concrete crushing action is accurately made, and the second part longer than the third part is tapered. Therefore, it is understood that the volume of the tapered portion is reduced and the penetration depth can be increased.

  Adopting the specific dimensions as claimed in claim 2 is suitable for securing high fastening strength while permitting reliable driving in driving used for gas combustion type or pneumatic type power driving which is generally marketed. Met.

  Next, an embodiment of the present invention will be described with reference to the drawings.

(1). Description of Configuration FIG. 1 shows the configuration of a fastener. (A) is a front view, (B) is a bottom view, and (C) is a partial front view. The fastener is made of a rust-proof hard metal such as a stainless steel wire, and includes a shaft 1 and a large-diameter head 2 formed integrally with the base end thereof.

  The shaft 1 includes a first portion 3 that is continuous with the head 2, a two portion 4 that is continuous with the first portion 3, and a third portion 5 that is continuous with the second portion 4 and forms the tip of the shaft 1. The first portion 3 has a straight shape in which the outer diameter D is the same over the entire length, and the second portion 4 is reduced in diameter by a constant ratio toward the third portion 5 (that is, in a longitudinal sectional view). The third portion 5 is formed in a substantially bullet-like shape in which the outer diameter is reduced toward the tip while the outer cross-sectional outline is curved outwardly concavely. . Accordingly, the second portion 4 and the third portion 5 constitute a tapered portion 6.

  The length L1 of the first portion 3, the length L2 of the second portion 4, and the length L3 of the third portion 5 are set to have a relationship of L1> L2> L3, and L2 + L3 is set to 20 mm or less. The maximum outer diameter D of the shaft 1 is set to 5 mm or less. The dimensions of each part are as follows: L2 + L3 is 15 to 18 mm, D is 3 to 4 mm, the taper angle of the second portion 4 (the spread angle across the axis) θ is 5 to 7 °, and the curvature of the outline of the third portion 5 The radius R was 20 to 26 mm.

  The length L1 of the first portion 3 and the total length L0 of the shaft 1 vary depending on the thickness of the workpiece to be fastened. The first portion L1 is generally 15 mm or more. Therefore, L1 is generally approximately equal to or greater than (L2 + L3).

  When the inventors of the present application repeated trial manufacture and experiment, D was 3 to 4 mm, L2 was 8 to 9 mm, L3 was 6 to 8 mm, L4 was 14 to 17, θ was 5.5 to 6.5 °, and R was 22 ˜24 mm was suitable. Further, the length L3 of the third portion 5 was preferably about twice the outer diameter D of the first portion 3. In addition, L0 experimented in the range of 35-65 mm.

(2). Use state and action FIGS. 2 and 3 show the use state. 2 is a cross-sectional view, and FIG. 3 is a plan view. In this example, the waterproof sheet 7 and the heat insulating material 8 as a workpiece are used for fixing to the concrete 9, and the waterproof sheet 7 and the heat insulating material 8 are pressed and fixed to the concrete 9 via a washer 10 made of a metal plate. ing.

  The fastener is driven using, for example, a gas combustion type driving tool, and the entire tapered portion 6 and a part of the first portion 3 enter the inside of the concrete 9 in the driven state. The dimension that the first portion 3 entered the concrete 9 is indicated by L5, and the whole dimension that the shaft 1 entered the concrete is indicated by L6. In addition, since the waterproof sheet 7 and the heat insulating material 8 are soft, they do not have resistance against the shaft 1 when driven, and the resistance to the shaft 1 is given exclusively by the concrete 9.

  The shaft 1 enters the concrete 8 in the order of (A), (B), and (C) in FIG. In this case, as indicated by the one-dot chain line in (A), the strength is reduced if the entire tapered portion 6 is tapered. However, in the present invention, the third portion 5 is bullet-shaped, so that the strength is ensured. The concrete 8 is crushed accurately, and the leading function to the inside of the concrete 9 is accurately exhibited.

  Further, if the entire tip 6 has a bullet shape, there is a risk that the resistance will increase rapidly at the beginning of driving and it becomes impossible to drive deeply. However, in the present invention, the third portion 5 is less than half of the tip 6. Since more than half of the tapered portion 6 is occupied by the second portion 4 having a tapered shape (conical pyramid shape), the driving depth can be increased. Further, since the second portion 4 is longer than the third portion 5, the taper angle θ of the second portion 4 is small, and thus it is difficult to come off.

  As described above, the combination of the bullet-shaped third part 5, the tapered second part 4 and the straight first part 3 ensures a high fastening strength by using the same power tool as before. We were able to.

  The washer 10 includes a recess 10a in which the fastener head 2 is hidden. On the other hand, the gas combustion type or pneumatic type driving tool is provided with a probe that moves backward when pressed against the surface of the workpiece as a safety device in order to prevent the fastener from being launched in the air. In addition, the tip of the probe 11 is set so as not to fit into the recess 10 a of the washer 10.

(3). Other use example In FIG. 5, the example using the thick heat insulating material 8 is shown. In this case, the total length of the shaft 1 is naturally longer than that of the first use example, but the depth at which the shaft 1 enters the concrete 9 is set to be almost the same.

  There are several types of heat insulating materials 8 with different thicknesses, but the length of the first portion 3 is such that the fastener has a substantially constant depth of penetration L6 into the concrete 9 even if the workpiece thickness is different. L1 and full length L0 may be set. Note that the heat insulating material 8 may be sandwiched between the upper and lower waterproof sheets 7.

  FIG. 6 shows another example of the washer 10. The washer 10 is set so that the probe 11 of the driving tool fits into the recess 10a. In this case, the recess 10a is widened upward, so that the fixed head portion 13 in the tool cannot be used. When the probe 11 is fitted in the recess 10a, there is an advantage that the fastener driving position can be easily positioned accurately.

(4) Comparison with the prior art Japanese Patent Application Laid-Open No. 2002-339926 discloses a driving fastener having a shaft 21 and a head 22 as shown in FIG. A tapered first portion 23 having a curved outline, a tapered second portion 24 continuous with the first portion 23, and a straight third portion 25 continuous with the second portion 24. The composition is described.

  JP 2002-327720 A also discloses a fastener having a first portion 23 and a second portion 24 similar to those of JP 2002-339926 A, as shown in FIG. (However, in Japanese Patent Laid-Open No. 2002-327720, the third portion 25 has a tapered shape. In both publications, the length of the first portion 23 is longer than the length of the second portion 24.

  However, if the length of the first portion 23 is increased in this way, the resistance at the time of driving increases rapidly, so that there is a possibility that the driving depth cannot be increased. When applied to the above, there is a possibility that satisfactory fastening strength cannot be secured. In particular, in the type of FIG. 7B, since the third portion 25 has a tapered shape, it becomes more difficult to drive deeply.

  On the other hand, as described above, the present invention can be driven deeply into the concrete, so that a high fastening strength can be ensured while being a fastener having a long length.

It is a figure which shows the fastener which concerns on embodiment of this invention. It is sectional drawing which shows the use condition of a fastener. It is a top view which shows the use condition of a fastener. It is a figure which shows the state in which a fastener is driven. It is sectional drawing which shows another use condition. It is sectional drawing of another example of the washer used as a set with a fastener. It is a figure which shows a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 axis | shaft 2 head 3 1st part 4 2nd part 5 3rd part 6 point detail 7 waterproof sheet as an example of a workpiece 8 heat insulating material as an example of a workpiece 9 concrete

Claims (2)

It is composed of a shaft and a head formed at one end of the shaft. By forming the tip of the shaft on the opposite side of the shaft as a tapered portion, a soft work such as a waterproof sheet or heat insulating material can be fixed to concrete. A drive-in fastener,
The shaft includes a first portion continuous with the head, a second portion continuous with the first portion, and a third portion continuous with the second portion and including the tip of the shaft. Is a straight shape whose outer diameter is the same over its entire length, the second part is a tapered shape whose outer diameter is reduced at a constant ratio toward the third part, and the third part is reduced in appearance toward the tip. The outer shape in the longitudinal sectional view is formed in a substantially bullet shape that is curved in an outwardly concave shape while having a diameter. For this reason, the second portion and the third portion constitute the tapered portion,
Furthermore, the length L1 of the first portion, the length L2 of the second portion, and the length L3 of the third portion are set in a relationship of L1>L2> L3.
Drive-in fastener for concrete. It is used by being loaded into a power type driving tool that uses gas combustion pressure or pneumatic pressure as a drive source, L2 + L3 is set to 15 to 18 mm, the outer diameter of the first part is set to 3 to 4 mm, The taper spread angle of the 2 part is set to 5 to 7 °, and the curvature of the curve in the longitudinal section is set to 20 to 26 mm in the third part.
A drive-in fastener for concrete according to claim 1.

Images