JPH109234A - Manufacture of anchor, and anchor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need for drilling a hole part, into which a pin is fitted, and easily form an anchor body, in the shaft center part of which a hole part is formed, by forging. SOLUTION: A metal pipe material 5 cut to a suitable length, is prepared. This pipe material is axially compressed, pressed and forged by means of a press, etc., using an upper die 65 and a female die 66, and formed so that the outside diameter of a tip part 12 becomes smaller. The hole part 15 is thus crushed. Next, pressure is applied to a-shaft part 11 from above downward by a press, using an upper die 68 and the female die 66 to form the part of a head part 13. The two-stage plastic working can also be performed by a single forging process. A slit 16 is cut into the tip part 12 from the lower tip of the shaft part 11 to the hole part 15 so as to divide the tip part into two parts. A pin 1 is fitted into the hole part 15 to complete an anchor. Cutting the slit 16 can also be performed in the stage prior to the plastic working.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to concrete,
The present invention relates to an anchor used when fixing an object to be fixed such as various fittings to a structure such as a brick or a block, and a method of manufacturing the anchor.

[0002]

2. Description of the Related Art FIG. 4 is an explanatory view sequentially showing a conventional method for manufacturing an anchor, in which (A) is a front view of a wire rod 50 as a raw material, and (B) is a head of an anchor body by forging. FIG. 9C is an explanatory view of forming the portion 52, FIG. 10C is a front view of the completed anchor body, and FIG. 10D is a front view of a state where the anchor is completed by combining the pins 58. First, as shown in FIG. 4A, a metal wire 50 having a circular cross section and appropriately cut into a length is prepared. In FIG. 4 (B), the shaft portion 51 of the wire 50 is strongly held by the punching die 60 or the like by a press forging method or the like, and a pressure is applied by a press machine in the longitudinal direction of the wire by a press punch 61 or the like, and The part 52 is formed.

Thereafter, in FIG. 4 (C), a hole 55 for receiving a pin 58 in the longitudinal direction of the shaft 52 of the head 52 and the shaft 51 is formed by a working tool such as a drill or a drill. . Alternatively, the head 52 and the hole 55 can be forged using a device such as a tubular header. Thereafter, a plurality of annular grooves 56 are cut at the lower end of the shaft portion 51 with a cutting tool. As will be described later, the groove portion 56 serves as a hook portion for the structure 72 when the distal end portion of the shaft portion 51 is expanded. Further, the shaft 5
A slit 57 is provided so as to divide the distal end portion into two from the lower distal end of 1 to the hole portion 55. Finally, in FIG. 4D, the pin 58 is fitted from above the hole 55 to complete the anchor.

FIGS. 5A and 5B are explanatory views showing a method of using the above-mentioned conventional anchor, wherein FIG. 5A shows a state where the anchor is set in a pilot hole, and FIG. 5B shows a state where the anchor is fixed. Is shown. First, in FIG. 5 (A), a pilot hole 70 is previously drilled in the fixed object 71 and the structure 72 by an electric drill or the like, and the anchor 53 is set in the pilot hole 70. In FIG. 5B, by hitting the pin 58 with a hammer or the like and driving the pin 58,
The tip of the pin 58 is forcibly fitted into the slit 57,
The slit 57 is expanded, and at the same time, the tip 5
The anchor 53 is fixed to the structure 72 by expanding the four and 54, and at the same time, the fixed object 71 is
2 can be fixed. In this figure, a plurality of annular grooves 56 provided at the distal end serve as hooks to the structure 72 when the distal ends 54, 54 are expanded by driving the pins 58.

In the above-mentioned conventional anchor 53, the outer diameter of the head portion 52 is formed larger than the outer diameter of the shaft portion 51, but other anchors without the head portion 52 are particularly provided. Also exists. As an example, there is a so-called anchor bolt in which a thread is provided on an outer peripheral surface of an upper base end portion of the shaft portion 51. In this case, an object to be fixed is fixed by a nut or the like screwed into the thread. It can be fixed to a structure. As a method of manufacturing the anchor bolt, the step of press forging for forming the head as shown in FIG. 4B is unnecessary, but the head of the pin 58 is received. A molding step of expanding the inner diameter of the base end and a step of engraving a thread on the outer peripheral surface of the upper base end of the shaft portion 51 with a die or the like are required.

As another example, the inner diameter of the upper end portion of the hole 55 provided in the shaft core of the shaft 51 is made large,
There is also one in which a female screw is formed on the inner peripheral surface. In this case, the object to be fixed can be fixed to the structure with a bolt or the like screwed into the female screw. In this method of manufacturing the anchor, the step of press forging for forming the head as shown in FIG. 4B is not necessary, but a hole forming operation or a forming operation of the upper end portion having a large inner diameter of the hole 55 is required. Then, an operation step of forming a screw thread on the inner peripheral surface by a tap or the like is required.

[0007]

In the above-described conventional method for manufacturing an anchor, since the solid wire 50 is used as a material, a hole 55 for inserting the pin 58 is formed. And drilling work, and even in the case of forging, several steps such as three-step and four-step punching are required. In addition, in the operation for forming the hole portion 55, if the length of the anchor becomes longer than a certain level, it becomes difficult to manufacture from various points such as tools, the number of steps, and operation time. Furthermore, too much hole 5
The length of the anchors produced by this method was limited, as the work could become substantially impossible if the depth of 5 was increased. Therefore, in the present invention, it is not necessary to drill a hole for fitting a pin as in the above-described conventional method, and the body of the anchor having the hole formed in the shaft core by forging is simply formed. It is an object of the present invention to provide a manufacturing method and an anchor manufactured by the method.

[0008]

In order to solve the above problems, a first aspect of the present invention is that a shaft core of a shaft portion 11 is provided at a position from an upper base end of the shaft portion 11 to a lower end of the shaft portion 11. The shaft portion 11 has a slit 16 extending from the tip to the hole 15 at a lower end of the shaft portion 11. In a method for manufacturing an anchor for a structure such as concrete in which a pin 1 is inserted from the upper end of a metal pipe, a metal pipe member 5 of an appropriate length is used as a material of an anchor body 10, and once or twice or more. The shaping of the distal end of the shaft 11 of the anchor body 10 and the shaping of the base end of the anchor main body 10 are performed by plastic working, and before or after this plastic working, a slit is formed in the distal end of the shaft 11. 16. A method for manufacturing an anchor, comprising forming an anchor. In this manufacturing method, since the pipe material 5 is used as the material of the anchor main body 10, a drilling operation step of drilling the hole 15 for fitting the pin 1 is not required, and plastic working such as press forging is not required. The basic shape of the main body 10 of the anchor is easily completed by the processing. After that, the slit 16 at the tip of the shaft may be formed.

According to a second aspect of the present invention, a pin driving hole formed in the shaft core of the shaft portion 11 from the upper base end of the shaft portion 11 toward the lower end portion of the shaft portion 11. A lower end of the shaft portion 11 having a slit 16 extending from the end to the hole 15, and a structure of concrete or the like in which the pin 1 is inserted from the upper end of the hole 15. In the object anchor, the anchor main body 10 is formed from a metal pipe material 5, and the anchor main body 10 is formed by reducing at least the inner diameter of the distal end portion of the pipe material 5 by plastic working. An anchor having an enlarged portion 14, which has a slit 16 formed before or after the plastic working. Here, the expanding portion 14 is a portion where the slit 16 is provided at the distal end portion of the anchor main body portion 10, and a portion where the portion divided by the slit 16 is pushed and expanded by the driving of the pin 1. The anchor is connected to the first
Since the anchor manufactured by the manufacturing method according to the present invention does not require the hole 15 to be drilled, the shaft 1
Even a long anchor with one length can be easily manufactured.

According to a third aspect of the present invention, a pin driving hole formed in the shaft core of the shaft portion 11 from the upper base end of the shaft portion 11 to the lower end portion of the shaft portion 11. A lower end of the shaft 11 has a slit 16 extending from the end to the hole, and a pin 1 is inserted from the upper end of the hole 15
In a method of manufacturing an anchor for a structure such as concrete into which is inserted, a pipe material 5 is used as a material of an anchor body 10, and the pipe material 5 is cut into appropriate lengths.
A slit 16 is formed at the tip end of the pipe material 5, and at least a portion provided with the slit 16 is formed by rolling to form a groove or a screw thread, and a portion provided with the slit 16 at the same time by the plastic working. A method of manufacturing an anchor, characterized in that the inner diameter of the pipe member 5 is reduced. In this manufacturing method, since the pipe member 5 is used as the material of the anchor main body 10 as in the first invention, the hole 15 for fitting the pin 1 is used.
No drilling work step is required. On the other hand, a groove portion, a screw thread, and the like can be formed simultaneously with the process of reducing the inner diameter of the portion provided with the slit 16 by the rolling process.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 3 illustrate an embodiment of the present invention. FIG. 1 shows a method of manufacturing an anchor according to the present invention, in which (A) is a front view of a pipe material 5 cut to a predetermined length, and (B) is a tip end of a shaft portion 11 of an anchor main body. Explanatory drawing showing the forming process on the side, FIG. (C) is an explanatory diagram showing the forming process on the upper base end side of the shaft portion 11, and (D) shows a state in which a slit is formed in the distal end portion 12 of the shaft portion 11. FIG. 4E is a front view of the state where the anchor is completed.

First, as shown in FIG. 1A, a metal pipe member 5 having a constant outer diameter and appropriately cut into lengths is prepared. A hole 15 having a constant inner diameter naturally penetrates in the longitudinal direction of the shaft core portion of the pipe material 5 as a material. next,
As shown in FIG. 1 (B), forging is performed by applying a force in the axial direction by a mechanical hammer or a press machine using the upper die 65 and the lower die 66 to form the tip 12 of the shaft 11. I do. The tip portion 12 is formed so as to have an outer diameter smaller than the outer diameter of the shaft portion 11, and the hole portion 15 of the tip portion 12 is crushed and the inner diameter is reduced. In this figure, an example in which the inner diameter is maintained to some extent is illustrated. However, the inner diameter may be reduced to substantially eliminate holes, in other words, to reduce the inner diameter to substantially zero. Thereafter, as shown in FIG. 1C, the head 13 of the shaft 11 is formed.

That is, the inner peripheral portion of the upper end portion of the head portion 13 and the hole portion 15 is formed by press forging or the like by applying pressure from above to the shaft portion 11 by the upper die 68 and the lower die 66. . The cross-sectional shape of the head portion 13 may be circular, like the shaft portion 11, or may be a hexagonal cross-section, and can be freely designed. Thereafter, although not shown, the shaft portion 1 is
1, and as shown in FIG. 1D, the tip 12 is divided into two parts from the lower tip of the shaft 11 to the hole 15, that is, a plane including the center of the shaft. The slit 16 is cut so as to be divided into two. Further, the shaft 1
An annular groove or a ridge, if necessary,
Alternatively, a spiral groove or ridge (thread) is processed. Then, the pin 1 is fitted into the hole 15 to complete the anchor as shown in FIG.

An annular groove or a spiral groove is
When the pins are driven in and the expanding portions 14, 14 at the tip of the shaft portion 11 are expanded, they serve as hooks to the structure. The processing of the annular grooves and the ridges may be performed by cutting, but may also be performed by rolling using a rolling die used for screw processing. When a rolling die is used, the outer diameter increases as the valley diameter decreases.
A structure substantially similar to that shown in FIG. The division of the distal end portion 12 by the slit 16 is not divided into two but divided into four.
The number of divisions, such as division and division, can be changed as appropriate.
Either the processing of the annular groove or the ridge or the processing of the slit may be performed first. Further, the slit forming process may be performed before the plastic working. Slit 1 before plastic working
When 6 is formed, the interval between the slits 16 is
Although the gap is eliminated by the plastic working, that is, the interval is reduced to zero, but the slit 16 itself is notched, so that no problem occurs when the expanding portions 14 are expanded.

In the above manufacturing method, as shown in FIGS. 1 (B) and 1 (C), the main body of the anchor is manufactured by a two-stage forging process. That is, it is also possible to press once with the press machine by the lower die 66 and the upper die 68 to form both the tip portion 12 and the head portion 13 of the shaft portion 11 at one time. In this case, since the hole 15 of the shaft core on the side of the head 13 may be crushed, the crushed hole 15 may be formed by using a pin or a drill in a later step. Is required. However, this hole punching operation can be easily performed in a short time because the crushed portion is a part of the hole.

FIG. 2 is an illustration depicting one step in a method of manufacturing another type of anchor. This anchor does not have a head portion having an outer diameter larger than the outer diameter of the shaft portion 11, and a thread is formed on the outer peripheral surface 18 of the base end portion 21 of the shaft portion 11. Screw the
This is a so-called anchor bolt that can fix an object to a structure. First, the tip portion 12 of the shaft portion 11 is subjected to plastic working by forging with a press machine or the like using an upper die 65 and a lower die 66 in the same manner as in the embodiment shown in FIG. Next, as shown in FIG.
Is subjected to press forging by a lower die 66 and an upper die 69 to form the upper end portion 17 of the hole 15. The head of the pin 1 fits into this hole.

In this molding process, it is also possible to manufacture the semiconductor device by one molding step instead of the two molding steps. That is, press forging is performed using the upper mold 69 and the lower mold 66 (FIG. 1B), and the plastic processing of the anchor main body can be performed in one step. Thereafter, a thread is formed on the outer peripheral surface 18 of the base end 21 of the shaft 11, and a slit is formed on the distal end 12 of the shaft 11, thereby completing the main body of the anchor. The formation of the thread and the formation of the slit may be performed first. Also in this embodiment, the slit forming process can be performed before the plastic forming of the shaft portion.

FIG. 3 is an explanatory view illustrating one step of a method for manufacturing still another type of anchor. This anchor also does not have a head having an outer diameter larger than the outer diameter of the shaft portion 11 and forms a thread on the inner peripheral surface 19 of the base end portion 22 of the shaft portion 11 to form a female screw portion. Is formed, and a bolt or the like is screwed into the female screw portion so that the object to be fixed can be fixed to the structure. First, the tip 12 of the shaft 11
In the same manner as in the embodiment shown in FIG. 1B, plastic working is performed by forging with a press machine using an upper die 65 and a lower die 66. Next, as shown in FIG. 3, the base end portion 22 of the shaft portion 11 is press-forged by the lower die 66 and the upper die 75, and the upper portion of the hole 15 is formed. In a later step, a thread is formed on the inner peripheral surface 19 of the hole, and a female thread is formed.

In this molding process, it is also possible to manufacture the semiconductor device by one molding step instead of the two molding steps. That is, press forging is performed using the upper mold 75 and the lower mold 66 (FIG. 1B), and the plastic processing of the anchor main body can be performed in one step. Thereafter, a thread is formed on the inner peripheral surface 19 of the base end portion 22 of the shaft portion 11, and a slit is formed in the distal end portion 12 of the shaft portion 11, so that the main body of the anchor is completed. Either the engraving of the screw thread or the formation of the slit may be performed first. Further, the formation of the slit may be performed before the plastic working of the shaft portion.

On the other hand, as shown in FIG. 1, the anchor according to the present invention is manufactured by the above-described manufacturing method, and is attached to the shaft core of the shaft 11 from the upper base end of the shaft 11. A hole 15 for pin driving, which is formed toward the lower end portion 12 of the shaft portion 11, is provided. The lower end portion 12 of the shaft portion 11 has a slit extending from the end to the hole portion 15. 16, the pin 1 is inserted from the upper end of the hole 15, and a metal pipe material 5 of an appropriate length is used as a material of the anchor main body 10, once or twice or more. Forming of the distal end portion 12 of the anchor main body portion 10 and forging of the base end side of the head portion 13 and the like of the anchor main body portion 10 by forging or pressing of the shaft portion 11 before or after the plastic working. A slit 16 is formed in the tip 12.

That is, the anchor main body 10 has expanded portions 14, 14 formed by reducing at least the inner diameter of the distal end of the pipe member 5 by plastic working.
A base end (head 13) formed by processing the base end of the pipe member 5, and an intermediate portion 20 located between the expanding portion 14 and the base end (head 13). The expansion portion 14 has a slit 16 formed before or after the plastic working, and the intermediate portion 20 is used without deforming the pipe material 5. The intermediate portion 20 may be slightly deformed. Further, if necessary, the shaft 1
An annular groove or a ridge, a spiral groove or a ridge (thread), or the like can be formed at the one end portion 12.

In the anchor manufactured by the manufacturing method shown in FIG. 2 or FIG.
1 or the inner peripheral surface 1 of the base end 22 of the hole 15
Other types of anchors, such as anchor bolts, are formed by appropriately engraving threads on 9. Also in these anchors, an intermediate portion 20 between the distal end portion 12 and the proximal end portions 21 and 22 serving as the expanding portion is used without deforming the pipe material 5 as a raw material. The part 20 may be slightly modified. That is, the intermediate portion 20 may be subjected to plastic working or cutting. These processes can be performed quickly and easily because the material is a hollow pipe material.

Although the embodiment of the present invention has been described above, the embodiment can be modified as follows.
First, the step of forming the slit can be performed before the plastic working of the anchor main body as described above, but other forms include the following method. That is, after cutting the pipe material to an appropriate length, a slit is immediately formed, and thereafter, the slit portion is formed, for example, a groove or a screw thread is plastically processed by a rolling die or the like, and at the same time, the slit is provided. The expanded portion can be formed by reducing the inner diameter of the hole of the shaft core at the tip end. In this case, the molding of the base end side may be performed at any stage. Also, in this manufacturing method, the gap between the slits formed at the tip of the shaft is crushed, and the gap disappears. However, since the slit itself remains, the opening of the tip of the shaft is expanded. No problems arise when the part is expanded.

The material and size (size such as outer diameter, inner diameter, wall thickness, length, etc.) of the pipe member 5 used in the present invention can be appropriately set as required. The length of the tip 12 of the shaft 11 can also be set freely, and the slit 16
Can be determined accordingly. Shaft 11
The length in the longitudinal direction of the outer peripheral surface 18 or the inner peripheral surface 19 in which the thread is provided at the base end of the base member can be freely set. Various types can be used for the upper die, the lower die, the fixing die, and the like used for stamping forging or press forging. The forging process may be performed once or twice or more. However, when plastic working is performed by one forging, the hole 15 at the center of the pipe material may be crushed. In some cases, it is necessary to add a drilling operation. In the case of performing more precise machining, it may be performed three or more times. However, as shown in the embodiment, it is possible to obtain a sufficiently accurate anchor by performing the machining within two times (double striking). it can.

[0025]

The present invention having the above-described embodiments has the following effects. In the first manufacturing method of the present invention, since a pipe material is used as a raw material, a hole is already formed in advance, and the basic form of the anchor main body is obtained by performing simple plastic working. Thus, various types of anchors can be manufactured more easily without the necessity of a drilling operation for making a hole in the shaft core portion of the shaft portion as in the related art. Furthermore, in the conventional method, it is difficult to manufacture an anchor having a certain length or more, and the length is limited. However, in the manufacturing method according to the present invention, a long pipe material is used. There is no limitation on the length of the anchor, and any length of anchor can be manufactured by the manufacturing method according to the present invention.

The second embodiment of the present invention manufactured by this manufacturing method
In the anchor according to the invention, the anchor can be manufactured more easily than the conventional anchor, and can be implemented as a longer anchor. In the third manufacturing method of the present invention, the same effect as in the first invention is obtained, and at the same time as the molding for reducing the inner diameter of the distal end portion (expanded portion) of the anchor main body, a groove is formed in this portion. And a screw thread can be formed, and a means can be provided in which, when the expanded portion is pushed and expanded by driving a pin, a groove or the like provided therein is hooked on a structure. As described above, the present invention exerts a great effect.

[Brief description of the drawings]

1A and 1B show a method for manufacturing an anchor according to the present invention, in which FIG. 1A is a front view of a pipe material, and FIG. 1B is an explanatory view showing a forming process on a tip end side of a shaft portion of an anchor main body. ,
(C) is an explanatory view showing the forming process on the upper base end side of the shaft portion, (D) is a front view showing a state in which a slit is formed at the distal end portion of the shaft portion, and (E) is a completed anchor. It is a front view of the state which carried out.

FIG. 2 is an explanatory view illustrating one forming step of manufacturing another type of anchor.

FIG. 3 is an explanatory view illustrating one molding step for producing still another type of anchor.

FIG. 4 is an explanatory view illustrating a conventional method for manufacturing an anchor, in which (A) is a front view of a wire, (B) is an explanatory view of a step of forming a head of the anchor, and (C) is completed. FIG. 2D is a front view of the completed anchor body, and FIG. 2D is a front view of a state where the anchor is completed by combining pins.

5A and 5B are explanatory views showing a method of using the conventional anchor shown in FIG. 4, wherein FIG. 5A shows a state in which the anchor is set in a pilot hole, and FIG. 5B shows a state in which the anchor is fixed. Is shown.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Pin, 5 ... Pipe material, 10 ... Body part, 11 ... Shaft part,
Reference numeral 12: distal end portion, 13: head portion, 14: expanded portion, 15: hole portion, 16: slit, 20: intermediate portion, 21, 22: base end portion, 65, 68, 69, 75: upper die, 66 … Lower mold

Claims (3)

[Claims] 1. A pin driving hole formed in a shaft core of a shaft (11) from an upper base end of the shaft (11) to a lower end of the shaft (11). (15), the lower end of the shaft (11) has a slit (16) from the end to the hole (15), and a pin is inserted from the upper end of the hole (15). (1) In a method of manufacturing an anchor for a structure such as concrete into which is inserted, a metal pipe material (5) having an appropriate length is used as a material of an anchor body (10), and once or twice. Anchor body (10) by the above plastic working
The shaping of the tip of the shaft (11) and the shaping of the base of the anchor body (10) are performed before or after this plastic working. ), The method for producing an anchor. 2. A pin driving hole formed in a shaft core of the shaft (11) from an upper base end of the shaft (11) toward a lower end of the shaft (11). (15), the lower end of the shaft (11) has a slit (16) from the end to the hole (15), and a pin is inserted from the upper end of the hole (15). In an anchor for a structure such as concrete in which (1) is inserted, an anchor main body (10) is formed from a metal pipe material (5), and the anchor main body (10) is connected to the pipe material (5). ) Has an enlarged portion (14) formed by reducing at least the inner diameter of the tip by plastic working, and the enlarged portion (14) is formed by a slit (16) formed before or after the plastic working. ). 3. A pin driving hole formed in a shaft core of the shaft (11) from an upper base end of the shaft (11) to a lower end of the shaft (11). (15), the lower end of the shaft portion (11) has a slit (16) from the end to the hole,
In a method of manufacturing an anchor for a structure such as concrete in which a pin (1) is inserted from the upper end of a hole (15), a pipe material (5) is used as a material of an anchor body (10). The material (5) is cut to an appropriate length, a slit (16) is formed at the tip of the pipe material (5), and at least a portion provided with the slit (16) is rolled to form a groove or a thread. And the like, wherein the inner diameter of the pipe material (5) in the portion provided with the slit (16) is reduced by the plastic working.