JP2012052382A - Tenon pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tenon pipe capable of mitigating impact loads by an earthquake or the like by attaining a structure to easily cause elastic-plastic deformation against tensile loads.SOLUTION: The tenon pipe 11 to be buried so as to pass through the boundary of one member 31 and the other member 41 to connect both members includes: a first pin hole 13 for inserting a drift pin 36 driven to the one member 31; a second pin hole 17 for inserting a drift pin 46 driven to the other member 41; and an extension part 15 whose entire periphery is curved in the radial direction between the first pin hole 13 and the second pin hole 17. Thus, when the tensile loads act, stress is locally increased around the extension part 15 and the elastic-plastic deformation is easily caused. Thus, when excessive loads act in the direction of separating the two members due to an earthquake or the like, an impact is mitigated and damages exerted to a building or the like can be reduced.

Description

  The present invention relates to a hozo pipe for connecting members such as a base and a pillar, a pillar and a horizontal member in various wooden structures.

  The wooden frame construction method that is widely used as a construction method for houses, etc., constructs a skeleton of a building by combining members such as foundations, columns, and horizontal members. In order to secure the strength of this skeleton, it is necessary to firmly connect adjacent members, and measures such as combining a tenon and a tenon groove have been taken for a long time. Hozo, however, has a problem in terms of strength and cost because the cross-sectional defect of the member tends to be large and fine adjustment is often required during construction. Therefore, in recent years, various hardwares are often used as substitutes for the hozo. Various hardware is easy to obtain strength, and by combining with pre-cut technology, the construction time at the site can be shortened.

  An example of the various hardware is a hozo pipe. The hozo pipe is a substitute for the conventional hozo, which is manufactured by cutting a metal round pipe into a predetermined length and is embedded so as to penetrate the boundary between two members to be connected. Further, when the drift pin is driven from the side surface of each member toward the hozo pipe, the two members are connected via the hoso pipe. In addition, it is necessary to process a pilot hole with the same diameter as the hozo pipe and a horizontal hole for driving a drift pin in each member in advance.

  Examples of the technology related to the present invention include Patent Document 1 and Patent Document 2 below. Patent Document 1 is an invention related to a hoso-pipe, and is characterized in that the hoso-pipe is divided into two parts and is rotatably connected so that it can be used even when the two members to be joined have an intersection angle. Further, Patent Document 2 is an invention aiming at being able to quickly attenuate the vibration at the time of an earthquake in a wooden structure, and is characterized in that a column and a beam are joined by a leaf spring-like joint fitting.

JP 2008-163662 A JP-A-4-261935

  Wood is poor in tenacity against external forces, and has a brittle nature that rapidly cracks and breaks at once when the applied load exceeds the limit. Wood is naturally derived and varies in strength due to various factors such as the presence of knots and water content. In order to deal with such a characteristic unique to wood, as in the above-mentioned Patent Document 2, a metal part is incorporated in a connecting portion between members, and the elasto-plastic deformation is used to apply an impact acting on the wood. Mitigating methods are effective.

  Conventional hozo pipes are intended to firmly connect two members, and no measures are taken into account when an impact load is applied due to an earthquake or the like. However, the hozo-pipe has a structure that easily causes elasto-plastic deformation as in Patent Document 2, so that the impact in the event of an earthquake can be mitigated, the destruction of pillars and other members can be avoided, and damage to the building can be reduced. I can expect that.

  The present invention has been developed on the basis of such a situation, and an object thereof is to provide a hozo pipe capable of relaxing an impact load due to an earthquake or the like as a structure that easily causes elasto-plastic deformation with respect to a tensile load.

  The invention according to claim 1 for solving the above-mentioned problem is used to connect one material and the other material, is hollow and is embedded so as to penetrate the boundary between the one material and the other material, On the side peripheral surface, a first pin hole for inserting a drift pin or bolt driven from the one material, a second pin hole for inserting a drift pin or bolt driven from the other material, The expansion pipe having an entire circumference curved in the radial direction is provided between the first pin hole and the second pin hole.

  The hozo pipe according to the present invention is used for connecting two adjacent members such as a base and a pillar, a pillar and a horizontal member in a T-shape or an L-shape in various wooden structures, and is a metal-made hollow circular section. Based on. In addition, since the hozo pipe can be used in various places, one of the two members to be connected is referred to as one member, and the remaining member is referred to as the other member.

  The hozo pipe is embedded so as to penetrate the boundary surface where the one material and the other material are in contact. In order to integrate the hozo pipe with the one material or the other material, a drift pin is driven from the side surface of the one material or the other material so as to penetrate the side peripheral surface of the hozo pipe. Therefore, it is necessary to provide a pin hole for allowing the drift pin to pass through on the side peripheral surface of the hozo pipe. In the pin hole, a direction through which a drift pin driven into one material is passed is referred to as a first pin hole, and a direction through which a drift pin driven into the other material is passed is referred to as a second pin hole. In addition, the number, interval, direction, and the like of the first pin hole and the second pin hole are arbitrary.

  In order to embed the hozo-pipe, a pilot hole having the same diameter as that of the hoso-pipe is processed in advance in one material and the other material at predetermined positions. Further, in order to drive the drift pin, a horizontal hole having the same diameter as that of the drift pin is processed in advance in both the one material and the other material. Of course, the lateral hole needs to be concentric with the first pin hole and the second pin hole when the hozo pipe is embedded. A bolt can be used as a substitute for the drift pin. In this case, the pin hole and the horizontal hole have an inner diameter through which the bolt shaft can pass without difficulty.

  The hozo pipe of the present invention is not a simple circular cross section as a whole, but is provided with an extended portion that is curved so as to bulge in the radial direction at the central portion thereof. The extended portion does not need to be provided at the center of the hozo pipe, but is necessarily provided between the first pin hole and the second pin hole. Therefore, when the hozo-pipe is embedded in one material and the other material, the extended portion is positioned near the boundary between the two materials. In order to accommodate the expanded portion, a counterbore hole having a diameter larger than that of the prepared hole is processed at the boundary between the one material and the other material. The radial direction means a direction orthogonal to the axial direction of the hozo pipe.

  The extended portion is not attached to a separately manufactured disk-like object by welding or the like, but is assumed to be formed by expanding a steel sheet constituting the hozo pipe in the radial direction by bending. In addition, the cross section of the expansion part can be freely selected such as a “<” shape or a semicircular shape. Furthermore, it is not necessary for the extended portion to be formed in a continuous manner, and a plurality of slits extending in the radial direction may be provided in consideration of bending.

  When a tensile load acts on the hozo pipe, a bending moment, a shear load, etc. act on the expanded portion, and the stress locally increases. Therefore, the deformation amount of the hozo pipe also increases, and it behaves like a spring. When an excessive load is applied in the direction to separate one material from the other, the impact is alleviated and damage to the pillars is reduced. it can. Even after the expansion portion is plastically deformed, the connection between the one material and the other material is maintained, and a decrease in strength of the connection portion can be suppressed.

  As in the first aspect of the present invention, by providing the extension part in which the central portion of the hozo pipe is radially expanded, when a tensile load is applied, the stress locally increases around the extension part, and It tends to cause plastic deformation. Therefore, when an excessive load is applied in the direction of separating the two members due to an earthquake or the like, the impact is alleviated and damage to the building can be reduced.

It is a perspective view which shows the example of the shape of the hozo pipe by this invention, and its use condition. It is a longitudinal cross-sectional view of the state which assembled each element of FIG. It is a perspective view which shows an example of the manufacturing method of a hozo pipe. It is a longitudinal cross-sectional view which shows the example of a shape of a hozo pipe.

  FIG. 1 shows an example of the shape of a hozo pipe 11 according to the present invention and its usage. The hozo pipe 11 in this figure is used to connect the base 31 (one material) and the column 41 (other material), and is embedded so as to penetrate the boundary surface between the base 31 and the column 41. The base 31 is placed on the upper surface of the concrete base 21, and a nut 23 and a washer 24 are incorporated at the tip of the anchor bolt 22 projecting from the base 21 to prevent the base 31 from being lifted.

  The hozo pipe 11 is made of steel and is based on a hollow circular cross section. The lower part is embedded in a base 31 and the upper part is embedded in a column 41. Therefore, pilot holes 35 and 45 having the same diameter as the hozo pipe 11 are processed in both the base 31 and the pillar 41. A first pin hole 13 is provided below the hozo pipe 11 so as to allow a drift pin 36 driven from the side surface of the base 31 to pass therethrough. A drift pin driven from the side surface of the column 41 is provided above the hozo pipe 11. A second pin hole 17 is provided to allow 46 to pass through.

  In order to drive the drift pins 36 and 46, lateral holes 32 and 42 are processed in the side surfaces of the base 31 and the pillar 41. The lateral holes 32 and 42 intersect the pilot holes 35 and 45 at right angles and reach the opposite surfaces. The processing positions of the horizontal holes 32 and 42 are adjusted so as to be concentric with the pin holes 13 and 17 when the hoso-pipe 11 is embedded at a predetermined position. In addition, the inner diameters of the lateral holes 32 and 42 are matched to the outer diameters of the drift pins 36 and 46, and the driven drift pins 36 and 46 are held by friction and do not fall off naturally.

  The extended portion 15 formed in the central portion of the hozo pipe 11 is a portion that is curved so as to expand the steel plate constituting the hozo pipe 11 in the radial direction. By providing such an extended portion 15, when a tensile load is applied to the hozo pipe 11, stress locally increases near the base of the extended portion 15, and it becomes easy to cause elastic-plastic deformation like a spring. . Therefore, even when an excessive load is applied to the pillar 41 or the like, the impact is mitigated by the flexible deformation of the hozo pipe 11, and cracking of the pillar 41 or the like can be prevented.

  As long as the extended portion 15 is located between the first pin hole 13 and the second pin hole 17, it does not necessarily have to be located at the exact center of the hozo pipe 11. In addition, in order to embed the expanded portion 15, it is necessary to process a counterbore hole 34 having a diameter larger than the pilot holes 35 and 45 at the boundary between the base 31 and the column 41. The counterbore 34 can be provided so as to straddle the boundary between the base 31 and the column 41, but is preferably provided only on one of the base 31 or the column 41 in order to reduce processing effort.

  If the two members are in surface contact, the hozo pipe 11 can be used not only for the connecting portion between the base 31 and the column 41 as shown in this figure but also for the connecting portion between the column and the horizontal member. In this figure, the drift pins 36 and 46 are driven in order to fix the hozo pipe 11, but a bolt can be used as an alternative.

  FIG. 2 shows a longitudinal section in a state where the elements shown in FIG. 1 are assembled. The base 31 is fixed to the base 21 with anchor bolts 22, and the pillar 41 is connected to the base 31 via the hozo pipe 11. The hoso-pipe 11 is integrated with the base 31 with two drift pins 36 and is further integrated with the column 41 with three drift pins 46. In addition, the extended portion 15 is accommodated in a counterbore hole 34 machined on the upper surface of the base 31, and the entire hozo pipe 11 is embedded in the base 31 and the column 41.

  When a load acts in the direction of pulling out the column 41 from the base 31 due to an earthquake or the like, the extended portion 15 is deformed to be extended as shown in the lower figure. Energy is absorbed by this deformation, and the impact on the pillar 41 and the like is alleviated. The extended portion 15 that has been stretched may then be crushed by the application of a load in the opposite direction to restore the original shape.

  FIG. 3 shows an example of a method for manufacturing the hozo pipe 11. Since the hozo pipe 11 according to the present invention is provided with the expansion portion 15, it cannot be manufactured simply by cutting out a steel pipe. Therefore, a planar steel plate may be finished into a predetermined shape by bending. In this case, the steel plate is first cut out to a predetermined size, and then bent near the center to form the "<"-shaped extension 15. Thereafter, a plurality of slits 19 are formed in the extended portion 15 to ensure workability.

  Next, the entire steel plate is bent and deformed into a cylindrical shape. At this time, as the deformation progresses, the interval between the slits 19 gradually increases. And if a steel plate becomes a perfect cylinder shape, if the contact part of the side end surfaces of a steel plate is closed by welding and the 1st pin hole 13 and the 2nd pin hole 17 are further formed in a predetermined position, the hozo pipe 11 will be completed. .

  FIG. 4 shows an example of the shape of the hozo pipe 11. As long as the extended portion 15 projects in the radial direction, the shape of the extended portion 15 is arbitrary. In addition to the semicircular cross section as in the other shape example 1, the flat rectangular cross section as in the other shape example 2, other A triangular cross-section such as shape example 3 can be used. In addition to the overall length of the hozo pipe 11, the number and arrangement of the pin holes 13 and 17 can be determined freely. In addition, as for the hozo pipe 11 of this figure, a slit may be formed in the extended portion 15 as in FIG.

11 Hozo pipe 13 1st pin hole 15 Expansion part 17 2nd pin hole 19 Slit 21 Foundation 22 Anchor bolt 23 Nut 24 Washer 31 One material (base)
32 Horizontal hole (one side)
34 Counterbore hole 35 Pilot hole (one material side)
36 Drift pin (one side)
41 Other material (pillar)
42 Horizontal hole (other material side)
45 Pilot hole (other material side)
46 Drift pin (other material side)

Claims (1)

Used to connect one material (31) and the other material (41),
Embedded in a hollow rod shape and penetrating the boundary between the one material (31) and the other material (41),
A drift pin (46) driven from the other material (41) and a first pin hole (13) for inserting a drift pin (36) driven from the one material (31), a bolt or the like are provided on the side peripheral surface. ) And a second pin hole (17) for inserting a bolt or the like,
A hoso-pipe characterized in that an extended portion (15) whose entire circumference is curved in the radial direction is provided between the first pin hole (13) and the second pin hole (17).

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