JPH0788660B2 - Deformed muscle anchor and its manufacturing method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deformed bar anchor used for concrete block construction work, partition work, steel bar construction civil work, and the like, and a manufacturing method thereof.

[0002]

2. Description of the Related Art As a known technique most similar to the present invention of this type, JP-A-5-18408 has been proposed.
In this case, the tube (2) is heated to a high temperature to turn red, or both the tube (2) and the deformed rebar (1) are heated to red and then the tube ( By applying external pressure to 2), it is pressure-bonded to the surface of the rebar (1), and in combination with the contraction action by natural cooling thereafter,
They are designed to be in close contact with each other.

[0003]

However, according to this, there is an advantage that theoretically high tensile strength can be obtained, and the 雖 also heats the cylinder (2) and the reinforcing bar (1) at high temperature to make them red. Since the manufacturing process is indispensable and the cylinder (2) and the reinforcing bar (1) are kept in a state where heat is not dissipated, the cylinder (2) must be pressurized by a press machine, etc. Not only is it difficult, but it also worsens the environmental conditions of work.

For example, it is practically impossible to automatically convey the cylinder (2) and the reinforcing bar (1) along a press working line, and to perform heating and reddening and pressurization in the conveying process.
It must be said that this is a manufacturing method that is not suitable for mass production, because it is necessary to take measures to prevent the seizure of the carrier belt.

Further, the cylinder (2) is a cut product made of a simple pipe material and has a uniform thickness throughout, and bites only by the height dimension of the node bulging on the surface of the reinforcing bar (1). Due to the pressurizing condition that is only suitable, when using the product, when the reinforcing bar (1) is struck by a hammer etc. illegally, or when it is embedded in a concrete block wall, for example, strong wind pressure is repeated. When received, the cylinder (2) provided with the notch (4) may be broken or missing from a midway portion corresponding to the tip of the reinforcing bar (1).

Further, since the tube (2) and the reinforcing bar (1) are heated and reddened by high temperature, a burnt mark or discoloration such as rust on the surface of the finished product is unsightly exposed and the commercial value of the product is reduced. In addition to that, it also gives anxiety about its use.

[0007]

DISCLOSURE OF THE INVENTION The present invention intends to improve such a problem. Therefore, as a deformed differential bar anchor, a proximal end side is a thin-walled insertion tube portion, and a distal end side is an expanding split groove. And a cylindrical anchor sleeve in which the expansion plug is partially press-fitted into the expansion cylinder, as well as a thick expansion cylinder having a stepped hole shape at both ends of the cylinder. , A deformed rebar having a small-diameter center protrusion projecting from the tip of the deformable rebar that can be fitted into the expansion opening of the anchor sleeve, and the insertion port cylinder of the anchor sleeve is inserted into the tip of the deformed rebar. It is characterized in that it is fitted and the insertion port cylinder portion is caulked and integrated with the tip end portion of the deformed rebar.

As the method for manufacturing the deformed bar anchor, firstly, the anchor sleeve is formed by plastic working or cutting of special steel so that the proximal end side has a thin insertion tube portion and the distal end side has a thick expansion. A stepped hole shape having an opening tubular portion is formed, and a plug of a steel ingot acting as a wedge is press-fitted into a partially overhanging state at the tip of the opening inflating tubular portion provided with an expanding split groove. On the other hand, by plastically working or cutting the end of the deformed bar, a small-diameter center protrusion that can be fitted into the expansion opening cylindrical part of the anchor sleeve is projected, and the anchor sleeve is attached to the end of the deformed bar. After inserting and fitting the insertion port tubular part of the above, under the cold working, the insertion port tubular part is characterized by being caulked and integrated so as to interlock with the node of the deformed rebar,

Secondly, the anchor sleeve is formed by plastic working or cutting of special steel to form a stepped hole having a thin insertion tube portion on the base end side and a thick expansion tube portion on the tip end side. The plug of the ingot that acts as a wedge is press-fitted into the expanded tubular part that is provided with the expanding split groove, with the tip part of the plug protruding, while the tip part of the deformed bar is plastically processed. With this, a plurality of concave circumferential grooves and convex ridges are engraved at the tip end portion thereof, and a small-diameter center projection that can be fitted into the expansion opening tubular portion of the anchor sleeve is also projected from the tip end portion of the deformed rebar. And insert the insertion port tube portion of the anchor sleeve into the tip of the deformed rebar, and then, by cold working the insertion port tube portion, form the concave circumferential groove and the convex periphery of the deformed rebar. It is characterized by being caulked and integrated so as to engage with the strip It is intended.

[0010]

According to the structure of the first aspect of the invention, the center projection having a small diameter which can be fitted into the expansion opening cylindrical portion of the anchor sleeve from the tip of the deformed bar is projected, and the center projection is the anchor sleeve. Under the condition that the inside of the expansion opening in the section is constrained so as to be packed, the insertion section tube section of the anchor sleeve is also caulked and integrated with the tip of the deformed rebar, so When the embedding work is performed on the rebar, if the reinforcing bar is illegally struck from a direction that does not follow its own axis, or if it receives wind pressure or other external force from the shearing direction during use, the anchor sleeve will be The high shear strength and the high tensile strength can be maintained without the possibility of breaking from the vicinity of the boundary step portion between the section and the expanded opening tubular portion.

Further, if the configuration of the second invention is adopted as a method for manufacturing the deformed differential bar anchor, the insertion sleeve tube portion of the anchor sleeve is engaged with the distal end portion of the deformed reinforcing bar to engage with the longitudinal segment or the transverse segment. As it is caulked, it is plastically deformed under cold working, so compared to the conventional technology of heating its anchor sleeve and deformed bar to heat red,
It can be said that this is a manufacturing method that can be expected to maximize the mass production effect because there is no risk of burning marks or discoloration, a deformed bar anchor with high commercial value can be obtained, and there is no need to perform difficult high temperature maintenance.

Further, according to the manufacturing method of the third aspect of the present invention, a plurality of concave circumferential grooves and convex circumferential grooves are preliminarily plastic-worked so as to be engraved at the tip end of the deformed bar, and then inserted into this. Since the insertion sleeve tube portion of the anchor sleeve that has been fitted is in a state of engaging with the concave circumferential groove and the convex circumferential strip, it is also caulked and integrated under cold working,
It has the effect of increasing the shear strength and tensile strength of the deformed bar anchor.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings. In FIGS. 1 to 3 showing the deformed bar anchors (products), (A) is a deformed bar of a constant length made of a steel bar for concrete. Further, the outer peripheral surface thereof is provided with vertical segments (11) and horizontal segments (12) intersecting with each other in a lattice form or a zigzag form. (D1) indicates the outer diameter dimension of the reinforcing bar (A) not including the transverse joint (12), and (D2) indicates the outermost diameter dimension of the reinforcing bar (A) also including the transverse joint (12).

Further, (13) is a center convex member that continuously and integrally projects from the tip of the reinforcing bar (A), and the tip of the reinforcing bar (A) is cut or plastically worked to form the outer portion. Outer diameter (D1) smaller than diameter (D1)
3) and is shaped into a cylindrical shape having a constant length (L1).

On the other hand, (B) is an anchor sleeve made of heat-treated special steel and having a constant outer diameter (D4) and having a cylindrical shape. The proximal end side of the anchor sleeve has a thin insertion port into the reinforcing bar (A). As the tubular portion (14), the remaining tip end side is a thick walled tubular portion (15), and the so-called stepped portion in which the inner diameter dimensions (d1) (d2) of the both-end tubular portions (14) and (15) change differently It is shaped like a hole.

In this case, the inner diameter dimension (d1) of the insertion tube portion (14) is the outermost diameter dimension (D) of the deformed bar (A).
2), and the inner diameter dimension (d2) of the expanded opening tubular portion (15) is the outer diameter dimension (D) of the center projection (13).
It is set almost equal to 3). Reference numeral (16) indicates a boundary step portion inside the double-ended tube portions (14) and (15).

Such an anchor sleeve (B) is made by cutting the base end side of a thick-walled special steel pipe, such as stepwise cold forging from a special steel rod and other plastic working, and cutting the thin-walled one. It can be shaped by the method of finishing the insertion tube portion (14).

Reference numeral (17) is a slit cut into the thick walled cylindrical portion (15) of the anchor sleeve (B) at a constant depth (L2) that does not reach the boundary step (16) from its tip. It is a groove and is distributed in a radial symmetry type such as a cross shape. Reference numeral (18) is a plurality of concave circumferential grooves for promoting the spreading action from the tip thereof and for suppressing the biting force with the concrete, which is engraved on the outer peripheral surface of the spreading opening cylindrical portion (15). There is.

Further, (19) is also a plug of heat-treated special steel ingot, which has a truncated cone shape or a bullet shape capable of acting as a wedge, and its base end having a small diameter has a cylindrical shape. The anchor sleeve (B) is press-fitted into the wide-opening tubular portion (15) so as not to fall off.

The large-diameter tip portion of the plug (19) is in a state of overhanging from the expanding opening cylindrical portion (15) by a predetermined length (L3), and is immersed in the expanding opening cylindrical portion (15). As described above, when the anchor sleeve (B) is relatively advanced and moved, the expansion opening cylindrical portion (15) of the anchor sleeve (B) is expanded from the tip end by the wedge action of the plug (19). ing.

When manufacturing the deformed bar anchor of the present invention from the reinforcing bar (A) and the anchor sleeve (B) as described above, the anchor sleeve (B) is first attached to the tip of the reinforcing bar (A). The thin insertion tube portion (14) is inserted and fitted.

Then, as is apparent from FIG. 4, the tip of the reinforcing bar (A) is correctly received and regulated by the boundary step (16) in the anchor sleeve (B), and the tip of the reinforcing bar (A) is also regulated. A center protrusion (13) protruding from the portion by a certain length (L1) is fitted into the thick walled cylindrical portion (15) of the anchor sleeve (B) and constrained so as to stuff the inside. Become.

Therefore, next, the insertion port cylinder portion (14) of the anchor sleeve (B) is pressed into the press dies (20) (2).
By 1), cold pressing is applied from the outer peripheral surface of the reinforcing bar (A) to plastically deform it into a crimped state in which it meshes with both nodes (11) and (12) of the reinforcing bar (A), and the separation of both Completed as a deformed differential muscle anchor that maintains an impossible fixed state.

Since the plastic deformation of the anchor sleeve (B) is performed as cold working, the center convex member fitted from the tip of the reinforcing bar (A) into the expanded opening cylindrical portion (15) of the anchor sleeve (B) now. Assuming that there is no (13), the inside of the anchor sleeve (B) occupying the space between the distal end of the reinforcing bar (A) and the proximal end of the plug (19) is, so to speak, unconstrained without a padding. Since it is left in the state, the above-mentioned pressing force spreads from the insertion opening tubular portion (14) of the anchor sleeve (B) to the expansion opening tubular portion (15), and both opening tubular portions (14) and (15) There is a risk of accidental breakage from the vicinity of the boundary step (16), which means that the expansion opening cylinder (15) of the anchor sleeve (B) is inserted into the insertion tube (1).
As compared with the case of 4), the thickness of the leech is also accompanied by the danger because it has the above-mentioned split groove (17).

In this respect, according to the present invention, the center projection (13) protruding from the tip of the reinforcing bar (A) by a constant length (L1).
However, in the anchor sleeve (B), a boundary step portion (16) between the insertion port tubular portion (14) and the wide opening tubular portion (15).
Since it is in a state of being fitted to the expanded opening cylindrical portion (15) beyond the above, and is restrained so as to be stretched and supported from the inside, high shear strength against the above-mentioned pressing force can be obtained, and there is a risk of breakage. There is no. Therefore, it is possible to pressurize the insertion tube portion (14) strongly without any restriction.
The tensile strength of the deformed bar anchor can be further increased.

In the deformed muscle anchor manufactured in this manner, as is apparent from FIG. 5, the plug (1
The mutual gap (S) between the base end part of 9) and the tip part of the center convex element (13) is equal to the protruding length (L3) of the plug (19) protruding from the tip of the expanding cylindrical part (15). Same or
Needless to say, it is sized larger than this.

Next, FIGS. 6 to 9 show a modified embodiment of the present invention, and the points different from the basic embodiment of FIGS.

In other words, in the case of the above-mentioned basic embodiment, the center convex element (13) is projected at the tip of the deformed bar (A), and no processing is performed. In the caulking state in which it engages with (12), the insertion opening tubular portion (14) of the anchor sleeve (B) is only plastically deformed, but in the modified embodiment, the tip of the reinforcing bar (A) is further pressed or rolled. , A plurality of concave circumferential grooves (22) and convex circumferential stripes (23) are alternately formed at the tip of the plastic working by a method such as swaging.

At this time, the outer diameter dimension (D5) of the concave circumferential groove (22) is smaller than the outer diameter dimension (D1) of the reinforcing bar (A), and the outer diameter dimension of the convex circumferential strip (23). It is desirable that (D6) be set to be substantially equal to the outermost diameter dimension (D2) of the reinforcing bar (A), respectively.

The concave circumferential groove (22) and the convex circumferential groove (2)
3) To the tip of the reinforcing bar (A) in which the and are orderly engraved, continue to the insertion tube portion (14) of the anchor sleeve (B).
Is also inserted and fitted, and the insertion port tube portion (14) is crimped to engage with the concave circumferential groove (22) and the convex circumferential strip (23) of the reinforcing bar (A) as in the above-described basic embodiment. , It is plastically deformed under the cold working.

If the structure of such a modified embodiment is adopted, not only the plastic deformation for finishing as described above is performed by press working,
Since it can be performed as a rolling process, the tensile strength of the product-deformed bar anchor can be further improved as compared with that of the above-mentioned basic embodiment.

Since the other constructions of the modified embodiments of FIGS. 6 to 9 are substantially the same as those of the basic embodiment,
6-9, only the corresponding symbols to those of FIGS. 1-5 are entered, and the detailed description thereof is omitted.

In any case, the deformed bar anchor manufactured as described above is inserted into the embedded groove (G) drilled in the concrete surface (M) in the construction work of a concrete block wall, for example. The anchor sleeve (B) at the tip end is used by being inserted as shown in FIG.

Then, the reinforcing bar (A) exposed from the concrete surface (M) is then tapped with a hammer (24) or the like, and then the embedding groove (G).
Since the anchor sleeve (B) which is integral with the reinforcing bar (A) advances and moves relative to the plug (19) which is restrained by being stretched at the bottom of the anchor sleeve (B), the expansion sleeve cylinder (15) of the anchor sleeve (B) is moved. 11 spreads from the tip as shown in FIG. 11 to bite and fix the concrete irremovably, forming a strong skeleton of the concrete block fence.

In this case, the hammering force of the hammer (24) or the like is not properly applied along the axis of the reinforcing bar (A), or the wind force is repeatedly applied from the shearing direction during the use as the skeleton of the concrete block fence. Even if
Anchor sleeve (B) in the deformed muscle anchor
It is possible to maintain the shear strength which is rich in durability without fear of being broken.

[0036]

As described above, in the deformed differential bar anchor of the present invention, due to its constitution, the proximal end side has a thin walled insertion tube portion (1).
4) As a thick-walled wide-opening tube portion (15) having a splitting groove (17) on the front end side, a double-ended tube portion (14).
(15) A cylindrical anchor sleeve (B) formed in the stepped hole form and having the expansion plug (19) partially press-fitted into the expansion cylinder (15), and the above from the tip. The deformed rebar (A) is provided with a center projection (13) having a small diameter that can be fitted into the expansion opening cylindrical part (15) of the anchor sleeve (B). Since the insertion port tube portion (14) of the anchor sleeve (B) is inserted and fitted and the insertion port tube portion (14) is caulked and integrated with the tip end portion of the deformed rebar (A), it is described at the beginning. Moreover, there is an effect that the problems of the conventional technology can be surely improved.

That is, according to the above configuration, the deformed bar (A)
A small-diameter center protrusion (13) that continuously and integrally projects from the distal end of the is inserted into the thick walled cylindrical portion (15) of the anchor sleeve (B), and the inside is constrained so as to be packed. Under the condition, also anchor sleeve (B)
Since the thin-walled insertion tube portion (14) of (1) is a product that is caulked and integrated with the tip portion of the reinforcing bar (A), it is embedded in the embedding groove (G) of the concrete surface (M). When deformed, the deformed rebar (A) is illegally struck from a direction that does not follow its own axis, or it receives wind pressure or other external force from the shearing direction during use, but it is also caulked. Anchor sleeve (B)
There is no risk of accidental breakage from the vicinity of the boundary step (16) between the insertion tube portion (14) and the wide opening tube portion (15),
High shear strength and tensile strength can always be maintained.

In manufacturing the deformed muscle anchor, as described in claim 2, the anchor sleeve (B) is used.
Is formed into a stepped hole with a thin-walled insertion tube portion (14) at the base end side and a thick-walled expansion tube portion (15) at the tip end side by plastic working or cutting of special steel. To the expansion opening cylindrical portion (15) provided with the expansion split groove (17),
The wedge-shaped ingot plug (19) is press-fitted into the partially protruding state of the tip thereof, while the tip end of the deformed bar (A) is plastically worked or cut to expand the anchor sleeve (B). A center protrusion (13) having a small diameter that can be fitted into the opening tubular portion (15) is provided in a protruding manner, and the insertion tubular portion (14) of the anchor sleeve (B) is inserted into the distal end portion of the deformed bar (A). After being fitted, the deformed rebar (A) is formed by cold-working the insertion tube portion (14).
If the method of caulking and unifying with the nodes (11) and (12) of No. 1 is adopted, the thin-walled insertion tube portion (14) of the anchor sleeve (B) is inserted into the distal end portion of the deformed rebar (A). Unlike the prior art described at the beginning, it is crimped so as to engage with the longitudinal joints (11) and the transverse joints (12) by plastic deformation as cold working after being fitted. In addition to unsightly burn marks and discoloration on the product, the product value can be greatly enhanced, and the manufacturing method is, for example, automatic transfer along the press processing line, and the press processing die in the transfer process ( 20) (21)
By the above, it is possible to impart the above-mentioned crimping action, and there is an effect that the mass productivity is excellent.

[0039] Further, the thin method of crimping the thin-walled insertion tube portion (14) of the anchor sleeve (B) to the tip portion of the deformed rebar (A) under cold working also produces
At that time, a small-diameter center projection (13) protruding from the tip of the reinforcing bar (A) is fitted into the thick walled tubular portion (15) of the anchor sleeve (B). In order to counteract the pressing force, the anchor sleeve (B) is broken from the vicinity of the boundary step portion (16) of the double-ended tube portions (14) and (15), or the expansion opening provided with the split groove (17). There is also no risk of the tubular portion (15) falling out.

In particular, if the manufacturing method of claim 3 is adopted, the tip of the deformed bar (A) is preliminarily plastic-worked so that a plurality of concave circumferential grooves (22) and a convex circumference are formed at the tip. When the line (23) is engraved and the insertion port tube portion (14) of the anchor sleeve (B) is caulked, this engages with the concave circumferential groove (22) and the convex circumferential line (23). Therefore, not only the above effect can be achieved, but also the shear strength and tensile strength of the deformed bar anchor can be further enhanced.

[Brief description of drawings]

FIG. 1 is a side view showing a deformed muscle anchor of the present invention.

FIG. 2 is a partially cutaway side view showing a disassembled state of the anchor.

3 is an enlarged cross-sectional view taken along line 3-3 of FIG.

FIG. 4 is a partially cutaway side view showing a state where the anchor sleeve is inserted into the deformed bar.

FIG. 5 is a partially cutaway side view showing a state where the anchor sleeve is also caulked.

FIG. 6 is a side view showing a deformed reinforcing bar according to a modified example of the present invention.

7 is an enlarged cross-sectional view taken along line 7-7 of FIG.

8 is a partially cutaway side view of a modified example corresponding to FIG.

9 is a partially cutaway side view of the same modified example corresponding to FIG.

FIG. 10 is an explanatory diagram showing a process of embedding and using a deformed muscle anchor.

FIG. 11 is an explanatory diagram showing a state of completion of embedding similarly.

[Explanation of symbols]

 (11) ・ Vertical joint (12) ・ Horizontal joint (13) ・ Center convex (14) ・ Inlet tube (15) ・ Expanding tube (17) ・ Split groove (19) ・ Plug (22) ・Recessed peripheral groove (23), convex peripheral strip (A), deformed reinforcing bar (B), anchor sleeve

Claims (3)

[Claims] 1. A thin-walled insertion tube portion (14) on the base end side, and a thick-walled wide-opening tube portion (15) provided with a widening split groove (17) on the front end side. 14) (15)
In addition to the stepped hole shape,
5) A cylindrical anchor sleeve (B) in which the expansion plug (19) is partially press-fitted, and a small diameter that can be fitted from the tip end into the expansion opening cylindrical part (15) of the anchor sleeve (B). A deformed rebar (A) provided with a protruding center convex element (13), and the insertion port tube portion (14) of the anchor sleeve (B) is inserted into the distal end of the deformed rebar (A) and fitted.
Moreover, the deformed reinforcing bar (A) is used for the insertion tube portion (14).
Anomalous differential muscle anchor characterized by being caulked and integrated to the tip of the. 2. An anchor sleeve (B) is formed of a special steel by plastic working or cutting work, and has a thin insertion tube portion (14) at the base end side and a thick expansion tube portion (15) at the tip end side. Is shaped into a stepped hole, and the expanding split groove (1
Into the expanded cylindrical portion (15) provided with 7), the wedge-shaped steel ingot plug (19) is press-fitted into the partially overhanging state of the tip, while the tip portion of the deformed bar (A) is plastically worked or By machining, a small-diameter center protrusion (13) that can be fitted into the wide-opening tube portion (15) of the anchor sleeve (B) is provided in a protruding manner, and the anchor is provided at the tip of the deformed rebar (A). Sleeve (B)
The insertion port cylinder part (14) is inserted and fitted, and the insertion port cylinder part (14) is engaged with the nodes (11) (12) of the deformed rebar (A) under cold working. A method for manufacturing a deformed muscle anchor which is characterized in that it is caulked and integrated. 3. An anchor sleeve (B) is formed of a special steel by plastic working or cutting work, and has a thin-walled insertion tube portion (14) on the base end side and a thick-walled expansion tube portion (15) on the tip end side. Is shaped into a stepped hole, and the expanding split groove (1
Into the expanded opening cylindrical part (15) provided with 7), the wedge-shaped steel ingot plug (19) is press-fitted into a partially projecting state of its tip, while the tip part of the deformed bar (A) is plastically worked. As a result, a plurality of concave circumferential grooves (22) and convex circumferential strips (23) are engraved at the tip of the anchor sleeve (B) from the tip of the deformed bar (A). A center protrusion (13) having a small diameter that can be fitted into (15) is provided in a protruding manner, and an anchor sleeve (B) is provided at the tip of the deformed bar (A).
Of the deformed rebar (A) and the convex peripheral strip, after the insertion port tube portion (14) is inserted and fitted, and the insertion port tube portion (14) is cold-worked. (23) A method for manufacturing a deformed differential muscle anchor, characterized in that it is caulked and integrated so as to engage with (23).