JP7424111B2 - Joining method - Google Patents

Description

The present invention relates to a joining method using a joining member.

In structural materials such as pillars and beams, fire resistance can be increased by covering structural members with low fire resistance such as wood with coating members with high fire resistance such as plaster. When an external attachment member such as an exterior material is attached to such a structural member, the external attachment member is attached to the structural member via a fixing metal fitting. The fixture is joined to the anchor bolt by threading a nut onto the anchor bolt provided on the structural member and sandwiching the nut and the covering member. A technique for joining an inner bonding material such as an anchor bolt located on the inside and an outer bonding material located outside the inner bonding material such as a fixing metal fitting using a screw connection is disclosed in, for example, Patent Document 1. There is.

Publication No. 52-50413

However, when the inner bonding material and the outer bonding material are bonded as described above, when an external force that presses the outer bonding material against the covering member acts on the outer bonding material, that external force is directly transmitted to the covering member. For this reason, it could not be used in cases where the covering member was easily broken.

A joining member that solves the above problem is a cylindrical joining member that has an outer circumferential surface with an outer circumferential thread formed on the outer circumference, and an inner circumferential surface with an inner circumferential thread formed on the inner circumference concentric with the outer circumference. The outer circumferential thread and the inner circumferential thread have the same thread pitch. Thereby, external force acting on the outer bonding material can be transmitted to the inner bonding material.

It is preferable that the joining member configured as described above has a head portion formed larger than the diameter of the outer periphery. Thereby, the work of fastening the joining members can be easily performed.
A bonding structure that solves the above problem includes the bonding member described above, an outer bonding material that is threadedly engaged with the outer circumferential thread, and an inner bonding material that is threadedly engaged with the inner circumferential thread. Thereby, external force acting on the outer bonding material can be transmitted to the inner bonding material.

A joining method for solving the above problem is a joining method for joining an outer joining material and an inner joining material, wherein a joining member for joining the outer joining material and the inner joining material is formed with an outer circumferential thread on the outer periphery. and an inner circumferential surface having an inner circumferential thread formed on an inner circumference concentric with the outer circumference, and the outer circumferential thread and the inner circumferential thread have the same dimensions. The outer bonding material has a female threaded portion to which the outer circumferential thread is threaded, and the inner bonding material has a male threaded portion to which the inner circumferential thread is threaded. In a state in which the male threaded portion of the inner bonding material is passed through the female threaded portion of the outer bonding material, the inner circumferential thread of the bonding member is screwed into the inner bonding material. The outer circumferential thread of the joining member is screwed into the female thread portion of the outer joining material. Thereby, the external force acting on the outer bonding material can be transmitted to the inner bonding material.

FIG. 2 is a perspective view showing one embodiment of a joining member. FIG. 3 is a cross-sectional view schematically showing an outer bonding material and an inner bonding material joined by a bonding member, together with a structural member to which the inner bonding material is fixed and a covering member covering the structural member. FIGS. 3A and 3B are diagrams for explaining a procedure for joining an outer joint material and an inner joint material with a joining member, including (a) a diagram showing a positioning process, (b) a diagram showing an overlapping process, and (c) a positioning process. , (d) a diagram showing the first screwing process, and (e) a diagram showing a state in which the second screwing process is completed. In a joint structure that joins an outer bonding material and an inner bonding material, (a) a diagram schematically showing a force transmission path when a compressive force is applied to the outer bonding material; (b) a diagram schematically showing a force transmission path when a compressive force is applied to the outer bonding material; A diagram schematically showing the transmission path of force when it acts.

An embodiment of a joining member, a joining structure, and a joining method will be described with reference to FIGS. 1 to 4.
As shown in FIG. 1, the joining member 10 has a cylindrical shape with a central axis C, and includes a shaft portion 12 having an outer circumferential surface on which an outer peripheral thread 11 is formed, and a base end portion of the shaft portion 12. The head 13 is integrally connected to the head 13.

The head 13 is formed larger than the diameter of the outer periphery of the shaft portion 12. Specifically, when the joining member 10 is viewed from the direction along the central axis C, the head 13 has a hexagonal outer shape in which a circle based on the diameter of the outer periphery of the shaft portion 12 is arranged inside. It is formed.

The joining member 10 has an inner circumferential surface on which an inner circumferential thread 15 is formed on the inner circumference concentric with the outer circumference of the shaft portion 12 . This inner circumferential thread 15 is formed across the shaft portion 12 and the head portion 13 so as to penetrate the joining member 10 .

The outer circumferential thread 11 and the inner circumferential thread 15 are formed to have the same size and thread pitch, and are fastened in the same rotational direction. For the outer circumferential thread 11 and the inner circumferential thread 15, the nominal diameter and thread pitch are selected in accordance with the metric thread specified in JISB0205, for example, after considering the mechanical strength required for the joining member 10. .

The joining member 10 may be manufactured by adding an inner circumferential thread 15 to a metal bolt, or may be manufactured by machining, that is, cutting out, a metal member. Further, the joining member 10 may be manufactured by additionally machining the inner circumferential thread 15 on a resin bolt.

As shown in FIG. 2, the joining member 10 joins an outer joining material 16 and an inner joining material 17.
The outer bonding material 16 is made of, for example, concrete, wood, metal, or the like. A female threaded portion 18 is formed through the outer bonding material 16 so that the outer circumferential thread 11 of the bonding member 10 can be screwed into the female threaded portion 18 . The female threaded portion 18 may be formed directly in the outer bonding material 16 by, for example, processing the outer bonding material 16, or may be formed in the outer bonding material 16 by embedding a mechanical component having the female threaded portion 18. The length L1 of the shaft portion 12 of the joining member 10 is set to a value substantially equal to the thickness t of the outer joining material 16.

The inner bonding material 17 is composed of an anchor bolt fixed to a structural member 19 made of, for example, concrete, wood, metal, or the like. The inner bonding material 17 has a fixing portion 20 fixed to the structural member 19 and a male screw portion 21 that protrudes from the structural member 19 and into which the inner circumferential thread 15 of the bonding member 10 can be screwed. When the inner bonding material 17 is fixed to the structural member 19, the male threaded portion 21 projects from the covering member 22 that covers the structural member 19 by a projecting length L2. It is preferable that this protrusion length L2 is slightly longer than the axial length L3 of the joining member 10.

The covering member 22 is a member adjacent to the outer bonding material 16 when the outer bonding material 16 and the inner bonding material 17 are bonded together. The covering member 22 is made of a material, such as gypsum, which has a lower mechanical strength than the outer bonding material 16 and the structural member 19 and is more easily broken. A through hole 23 through which the inner bonding material 17 can pass is formed in the covering member 22 . The through hole 23 is a circular hole having a diameter smaller than the diameter based on the nominal diameter of the female threaded portion 18 .

(Joining method)
Referring to FIG. 3, a method for joining the outer bonding material 16 and the inner bonding material 17 using the bonding member 10 will be described.

First, as shown in FIG. 3A, an alignment step is performed with the inner bonding material 17 fixed to the structural member 19 through the through hole 23 formed in the covering member 22. In the alignment step, the male threaded portion 21 of the inner bonding material 17 and the outer bonding material 16 on which the female threaded portion 18 is formed are aligned. Specifically, when the inner bonding material 17 and the outer bonding material 16 are brought close to each other along the central axis direction of the inner bonding material 17, the male threaded portion 21 of the inner bonding material 17 engages the female threaded portion 18 of the outer bonding material 16. Alignment is performed so that it passes through.

Next, as shown in FIG. 3(b), an overlapping process is performed. In the overlapping process, the inner bonding material 17 and the outer bonding material 16 are brought close to each other along the central axis direction of the inner bonding material 17, and the male threaded portion 21 of the inner bonding material 17 is passed through the female threaded portion 18 of the outer bonding material 16. The outer bonding material 16 is arranged so as to overlap the covering member 22.

Next, as shown in FIG. 3(c), a placement step is performed. In the arrangement step, the joining member 10 is arranged at a position where the inner circumferential thread 15 of the joining member 10 can be screwed into the male threaded portion 21 of the inner joining member 17 from the shaft portion 12 side.

Next, as shown in FIG. 3(d), a first screwing step is performed. In the first screwing step, by rotating the joining member 10 in the fastening direction about the central axis C, the joining member 10 is attached to the part of the male threaded portion 21 of the inner joining material 17 that protrudes from the outer joining material 16. The inner circumferential threads 15 are screwed together. The work of fastening the joining member 10 can be performed using a tool that can operate the head 13.

Finally, as shown in FIG. 3(e), a second screwing step is performed. In the second screwing step, by rotating the joining member 10 in the fastening direction about the central axis C, the male threaded portion 21 of the inner joining material 17 is positioned inside the female threaded portion 18 of the outer joining material 16. The inner circumferential thread 15 is screwed into the portion. Further, at the same time as the internal thread 15 is threaded, the outer thread 11 is threaded onto the female threaded portion 18 of the outer bonding material 16. Then, by rotating the joining member 10 to a position where the head 13 of the joining member 10 abuts the outer joining material 16, the joining between the outer joining material 16 and the inner joining material 17 is completed.

(effect)
The operation of the above-mentioned joining structure will be explained.
As shown in FIG. 4A, it is assumed that a compressive force F11 that attempts to press the outer bonding material 16 against the covering member 22 acts on the outer bonding material 16 as an external force. At this time, the compressive force F11 is applied to the threaded portion between the female screw portion 18 of the outer joint material 16 and the outer peripheral thread 11 of the joint member 10, the inner peripheral thread 15 of the joint member 10, and the male thread portion 21 of the inner joint member 17. A force F12 is transmitted to the structural member 19 through the screwed portion with the structural member 19 and the fixing portion 20 of the inner bonding material 17 to the structural member 19. That is, the compressive force F11 is transmitted to the structural member 19 through a path that makes it difficult for the force to be transmitted to the covering member 22.

As shown in FIG. 4(b), it is assumed that a tensile force F21 that attempts to separate the outer bonding material 16 from the covering member 22 acts on the outer bonding material 16 as an external force. At this time, the tensile force F21 is applied to the threaded portion between the female threaded portion 18 of the outer bonding material 16 and the outer circumferential thread 11 of the bonding member 10, and the threaded portion between the inner circumferential thread 15 of the bonding member 10 and the male thread portion 21 of the inner bonding material 17. The force F22 is transmitted to the structural member 19 through the screwed portion with the structural member 19 and the fixing portion 20 of the inner bonding material 17 to the structural member 19. That is, the tensile force F21 is transmitted to the structural member 19 through a path that makes it difficult for the force to be transmitted to the covering member 22.

The effects of this embodiment will be explained.
(1) Even if an external force acts on the outer bonding material 16, the external force is prevented from being transmitted to the covering member 22.

(2) The joining member 10 has a head 13 formed larger than the diameter of the outer circumferential thread 11. Thereby, the work of fastening the joining member 10 using a tool that can operate the head 13 can be easily performed. As a result, the workload of the fastening work can be reduced.

(3) When the length L1 of the shaft portion 12 is greater than the thickness t of the outer bonding material 16, a slight gap is formed between the outer bonding material 16 and the covering member 22. Thereby, even if the compressive force F11 acting on the outer bonding material 16 is transmitted to the covering member 22, the area on which the force based on the compressive force F11 acts can be limited.

(4) When the length L1 of the shaft portion 12 is smaller than the thickness t of the outer bonding material 16, the outer bonding material 16 and the covering member 22 come into surface contact. Thereby, even if the compressive force F11 acting on the outer bonding material 16 is transmitted to the covering member 22, the entire contact surface of the covering member 22 can receive the force based on the compressive force F11.

(5) When the length L1 of the shaft portion 12 is equal to the thickness t of the outer bonding material 16, the covering member 22 contacts the outer bonding material 16 and the bonding member 10. As a result, even if the compressive force F11 acting on the outer bonding material 16 is transmitted to the covering member 22, the covering member 22 contacts both the outer bonding material 16 and the bonding member 10 with a force based on the compressive force F11. You can receive it in parts.

(6) Since the protruding length L2 of the inner bonding material 17 is longer than the axial length L3 of the bonding member 10, the bonding member 10 can be bonded to the inner bonding material 17 over the entire length thereof. .

(7) The through hole 23 formed in the covering member 22 is a circular hole having a smaller diameter than the diameter based on the nominal diameter of the female screw portion 18. Thereby, the displacement of the covering member 22 with respect to the structural member 19 can be reduced.

This embodiment can be modified and implemented as follows. This embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.
・The outer circumferential thread 11 and the inner circumferential thread 15 are not limited to the configuration in which the nominal diameter and thread pitch are selected according to the metric thread specified in JISB0205, but are It may be an inch thread expressed by the number of threads.

- The head 13 of the joining member 10 may be formed smaller than the diameter of the outer periphery of the shaft portion 12 as long as it can be fastened using a tool.

DESCRIPTION OF SYMBOLS 10... Joining member, 11... Outer circumference thread, 12... Shaft part, 13... Head, 15... Inner circumference thread, 16... Outer bonding material, 17... Inner bonding material, 18... Female thread part, 19... Structural member, 20...Fixing part, 21...Male thread part, 22...Coating member, 23...Through hole.

Claims (1)

A joining method for joining an outer joining material and an inner joining material, the method comprising:
A joining member that joins the outer joining material and the inner joining material has an outer peripheral surface with an outer peripheral thread formed on the outer periphery, and an inner peripheral surface with an inner peripheral thread formed on the inner periphery concentric with the outer periphery. , and the outer circumferential thread and the inner circumferential thread have the same thread pitch;
The outer bonding material has a female threaded portion formed therethrough, into which the outer circumferential thread is threaded, and
The inner bonding material is formed with a male threaded portion into which the inner circumferential thread is threaded,
In a state in which the male threaded portion of the inner bonding material is passed through the female threaded portion of the outer bonding material, the inner circumferential thread of the bonding member is screwed into the inner bonding material while A joining method comprising screwing an outer circumferential thread into the female thread portion of the outer joining material.