JP2011242320A - Glulam strength measurement method - Google Patents

Glulam strength measurement method Download PDF

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JP2011242320A
JP2011242320A JP2010116051A JP2010116051A JP2011242320A JP 2011242320 A JP2011242320 A JP 2011242320A JP 2010116051 A JP2010116051 A JP 2010116051A JP 2010116051 A JP2010116051 A JP 2010116051A JP 2011242320 A JP2011242320 A JP 2011242320A
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strength
young
laminated material
laminated
modulus
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JP5399977B2 (en
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Koji Miura
公司 三浦
Seiji Kajitani
誠秀 梶谷
Fujio Maeda
富士男 前田
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TOTAL BUILDERS SYSTEM CO Ltd
Naigai Kogyo KK
ATA Co Ltd
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Naigai Kogyo KK
ATA Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a method which can easily and accurately measure the strength of glulam.SOLUTION: In a method in which the strength of a glulam 10 constituted by laminating a plurality of laminars 11 is measured according to Young's modules, the point at the same distance from right and left sides seen from the center of the right and left long directions of the glulam 10 is considered as a supporting point 7 and supported from the under side. The center is hit by the hitting machine and the oscillation frequency of the flexural vibration due to the hit is measured. Based on the frequency, the weight and the dimension of the glulam 10, the Young's modules is calculated. The strength of the glulam 10 is measured according to the Young's modules.

Description

本発明は、建築材料などとして使用される集成材の強度を測定する方法に関するものである。   The present invention relates to a method for measuring the strength of a laminated material used as a building material or the like.

図１乃至図３を参照して説明する。従来から、建築材料などとして使用される無垢材（木材）２０の強度を、その無垢材２０の木口２０ａをハンマー２１で叩き、その際に発生する音の周波数を測定し、その測定値と無垢材２０の重量や寸法などによってヤング率を算出して測定する方法がある（木口打音方式）。また、無垢材２０を実際に曲げて、その反力や撓み量を測定することによって、強度を測定する方法もある（曲げ方式）。   This will be described with reference to FIGS. Conventionally, the strength of a solid material (wood) 20 used as a building material or the like is hit with the hammer 21 of the solid material 20 with a hammer 21 and the frequency of the sound generated at that time is measured. There is a method of calculating and measuring the Young's modulus according to the weight and size of the material 20 (Kiguchi percussion method). There is also a method of measuring the strength by actually bending the solid material 20 and measuring the reaction force and the amount of bending (bending method).

近年、こうした無垢材２０に代えて、経済性などの理由から、複数のラミナー（板材）１１を積層して形成した集成材１０が建物の柱や梁として多く使用されるようになっている。また、集成材１０を構成するラミナー１１には、短い板をフィンガージョイントして長い板（ラミナー）としたものも使用されている。   In recent years, instead of such a solid material 20, for reasons such as economy, a laminated material 10 formed by laminating a plurality of laminators (plate materials) 11 is often used as a pillar or beam of a building. Further, as the laminator 11 constituting the laminated material 10, a long plate (laminar) obtained by finger jointing a short plate is also used.

こうした複数のラミナー１１によって形成された集成材１０の強度は、これまで、各ラミナー１１の強度を上記した木口打音方式や曲げ方式で測定し、それに基づいて算出していた。すなわち、集成材１０の日本農林規格が規定する強度を得るために、各ラミナー１１の強度を測定し、その強度を確保するに必要なラミナー１１を組合わせていた。   Until now, the strength of the laminated material 10 formed by the plurality of laminators 11 has been calculated based on the measurement of the strength of each laminator 11 by the above-described sounding method and bending method. That is, in order to obtain the strength defined by the Japanese Agricultural Standards for the laminated lumber 10, the strength of each laminator 11 was measured, and the laminator 11 necessary for securing the strength was combined.

なお、ラミナー１１の組合わせには、同一等級（同一強度）のものを組合わせた同一等級構成集成材（図２参照）と、異等級（異なる強度）のものを組合わせた異等級構成集成材（図３）の二通りがある。なお、図中のＬを頭とする数字（Ｌ−１０５等）は各ラミナー１１の強度を示す。   In addition, the combination of the same grade (same strength) of the same grade composition laminated material (see Fig. 2) and the different grade (different strength) of the different laminar 11 combination. There are two types of materials (Fig. 3). In addition, the numbers (L-105 etc.) beginning with L in the figure indicate the strength of each laminator 11.

しかし、こうした集成材１０の強度を、木口打音方式で測定し、その測定値に基づいて算出する従来の方法では、正確な強度を測定することができないとされてきた。   However, it has been considered that the strength of such a laminated material 10 cannot be measured accurately by the conventional method in which the strength of the laminated material 10 is measured by the Kiguchi percussion method and calculated based on the measured value.

これは、木口打音方式が木口を打撃する方法であり、集成材１０ではその木口１０ｅが複数のラミナー１１の木口１１ｅで形成され、また、各ラミナー１１の木口１１ｅ間には接着剤１２が存在しているため、集成材１０の木口１０ｅがその接着剤１２によって分離した状態にある。従って、例えば、集成材１０の木口１０ｅの中間部分に位置するラミナー１１の木口１１ｅを打撃した場合（打撃は、集成材１０の木口１０ａの全体ではなく、その一部分に対して行われる）、その振動が接着材１２によって遮られ、集成材１０の全体に円滑に伝わらないからであると考えられる。   This is a method in which the striking method of the sword is struck by the sword. In the laminated wood 10, the sword 10e is formed of a plurality of slats 11e, and an adhesive 12 is provided between the slats 11e of each laminator 11. Because of the presence, the wood mouth 10 e of the laminated wood 10 is in a state separated by the adhesive 12. Therefore, for example, when hitting the end 11e of the laminar 11 located in the middle part of the wood lip 10e of the laminated timber 10 (the blow is performed not on the whole wood lip 10a of the laminated timber 10), It is considered that the vibration is blocked by the adhesive material 12 and is not smoothly transmitted to the entire laminated material 10.

なお、従来の曲げ方式によって集成材１０の強度を測定するのは可能と思われるが、集成材１０を実際に曲げる必要があるために、手数が掛かり生産性が悪いので好ましくないと考える。   In addition, although it seems that it is possible to measure the intensity | strength of the laminated material 10 with the conventional bending system, since it is necessary to actually bend the laminated material 10, it thinks that it is not preferable because it takes time and productivity is bad.

本発明はこうした問題に鑑み創案されたもので、集成材の強度を正確かつ容易に測定することのできる方法を提供することを課題とする。   The present invention was devised in view of these problems, and an object of the present invention is to provide a method capable of accurately and easily measuring the strength of a laminated material.

図２乃至図５を参照して説明する。請求項１に記載の集成材強度測定方法は、複数のラミナー１１を積層して構成した集成材１０の強度をヤング率によって測定する方法である。   This will be described with reference to FIGS. The laminated material strength measuring method according to claim 1 is a method of measuring the strength of the laminated material 10 formed by laminating a plurality of laminators 11 by Young's modulus.

この測定方法は、前記集成材１０の左右長手方向の中心から左右等距離の地点を支点７として下方から支持し、前記中心を打撃機５で打撃して、その打撃によるたわみ振動の振動数を測定し、前記振動数と、前記集成材１０の重量および寸法に基づいてヤング率を算出し、そのヤング率によって前記集成材１０の強度を測定するものである。   In this measuring method, a point equidistant to the left and right from the center in the left-right longitudinal direction of the laminated material 10 is supported from below, and the center is hit with a hitting machine 5, and the frequency of flexural vibration due to the hit is determined. The Young's modulus is calculated on the basis of the frequency and the weight and dimensions of the laminated material 10, and the strength of the laminated material 10 is measured by the Young's modulus.

請求項２に記載の集成材強度測定方法は、強度の異なる複数のラミナー１１を積層して構成した異等級集成材１０ａの強度をヤング率によって測定する方法である。   The laminated material strength measuring method according to claim 2 is a method of measuring the strength of different graded laminated material 10a formed by laminating a plurality of laminators 11 having different strengths by Young's modulus.

この測定方法は、前記異等級集成材１０ａの左右長手方向の中心から左右等距離の地点を支点７として下方から支持し、前記中心を打撃機５で打撃して、その打撃によるたわみ振動の振動数を測定し、前記振動数と、前記異等級集成材１０ａの重量および寸法に基づいてヤング率を算出し、そのヤング率によって前記異等級集成材１０ａの強度を測定するものである。   In this measuring method, a point equidistant to the left and right from the center in the left-right longitudinal direction of the different grade laminated wood 10a is supported from below, and the center is hit with a hitting machine 5, and the vibration of the flexural vibration due to the hitting is supported. The Young's modulus is calculated based on the frequency and the weight and size of the different graded laminated material 10a, and the strength of the different graded laminated material 10a is measured based on the Young's modulus.

請求項１に記載の集成材強度測定方法は、集成材１０の左右長手方向の中心から左右等距離の地点を支点７として下方から支持した状態で、前記中心を打撃機５で打撃し、その打撃によるたわみ振動の振動数を測定するので、集成材１０の強度を正確に測定することができる。   The laminated timber strength measuring method according to claim 1, hitting the center with a hitting machine 5 with a point equidistant to the left and right from the center of the left and right longitudinal direction of the laminated timber 10 as a fulcrum 7, Since the frequency of flexural vibration due to impact is measured, the strength of the laminated material 10 can be accurately measured.

これは、集成材１０の左右長手方向の中心を打撃するものであり、その打撃を受けるラミナー１１の下面や上面は、集成材１０の木口１０ｅとは異なり、接着材の存在によって分離した状態にはない。従って、打撃による衝撃が集成材１０の全体に円滑に達するからであると考えられる。   This strikes the center of the laminated wood 10 in the left-right longitudinal direction, and the lower and upper surfaces of the laminator 11 receiving the blow are separated from each other due to the presence of the adhesive, unlike the wood mouth 10e of the laminated wood 10. There is no. Therefore, it is considered that the impact due to impact reaches the entire laminated material 10 smoothly.

また、この測定方法は、集成材１０を構成する各ラミナー１１の強度を測定する必要がないので、手数が掛からず、容易にその強度を測定することができる。   Moreover, since this measuring method does not need to measure the intensity | strength of each laminator 11 which comprises the laminated material 10, it does not take time and can measure the intensity | strength easily.

請求項２に記載の集成材強度測定方法は、請求項１に記載の発明と同様の効果を発揮する。また、この測定方法では、強度の異なる複数のラミナー１１で構成される異等級集成材１０ａの強度を正確に測定することができる。   The laminated wood strength measuring method according to claim 2 exhibits the same effect as that of the invention according to claim 1. Moreover, in this measuring method, the strength of the different graded laminated material 10a composed of a plurality of laminators 11 having different strengths can be accurately measured.

無垢材を示す斜視図である。It is a perspective view which shows a solid material. 同一等級集成材を示す斜視図である。It is a perspective view which shows the same grade laminated material. 異等級集成材を示し斜視図である。It is a perspective view which shows different graded laminated lumber. 本発明の実施形態に係る測定方法を示す側面図である。It is a side view which shows the measuring method which concerns on embodiment of this invention. 本発明の実施形態に係る測定方法を示すフローチャートである。It is a flowchart which shows the measuring method which concerns on embodiment of this invention.

本発明に係る集成材強度測定方法の実施形態を、図２乃至図５に示す。これは、強度の異なる複数のラミナー１１を接着剤１２で接着して積層した異等級集成材（異等級構成集成材）１０ａの強度をヤング率によって測定する方法である。   Embodiments of the laminated wood strength measuring method according to the present invention are shown in FIGS. This is a method in which the strength of a different graded laminated material (different graded laminated material) 10a obtained by laminating a plurality of laminators 11 having different strengths with an adhesive 12 is measured by Young's modulus.

この測定方法では、まず、異等級集成材１０ａの左右長手方向の中心から左右等距離の２地点を支点７とし、その支点７を支持台８によって下方から支持する。次に、左右長手方向の中心の下面を打撃機５で打撃して、その打撃によるたわみ振動の振動数を振動検出器（加速度センサー）６で測定する。なお、打撃機５による打撃は、異等級集成材１０ａの上面でも良い。また、振動検出器６は異等級集成材１０ａの下面に設置しても良い。   In this measuring method, first, two points equidistant from the center in the left-right longitudinal direction of the different graded laminated material 10 a are set as fulcrums 7, and the fulcrum 7 is supported from below by a support base 8. Next, the lower surface of the center in the left-right longitudinal direction is struck with the impacting device 5, and the frequency of the flexural vibration due to the impact is measured with the vibration detector (acceleration sensor) 6. The hitting by the hitting machine 5 may be performed on the upper surface of the different graded laminated material 10a. Moreover, you may install the vibration detector 6 in the lower surface of the different grade laminated material 10a.

そして、測定した振動数と、異等級集成材１０ａの重量および寸法に基づいてヤング率を算出し、そのヤング率によって異等級集成材１０ａの強度を割り出す。   Then, the Young's modulus is calculated based on the measured frequency and the weight and size of the different graded laminated material 10a, and the strength of the different graded laminated material 10a is determined from the Young's modulus.

以下、この測定方法を、図５を参照して、より詳細に説明する。まず、上位コンピューター１から通信用プロセッサー２に、重量測定指令信号、打撃指令信号、および予め取得した異等級集成材１０ａの寸法を送信する。これにより、通信用プロセッサー２から計測用プロセッサー３に、重量測定、打撃開始、および振動検出の測定開始信号が送信される。   Hereinafter, this measurement method will be described in more detail with reference to FIG. First, a weight measurement command signal, a batting command signal, and the previously acquired dimensions of the different graded laminated material 10 a are transmitted from the host computer 1 to the communication processor 2. As a result, a measurement start signal for weight measurement, hitting start, and vibration detection is transmitted from the communication processor 2 to the measurement processor 3.

次に、この測定開始信号によって、異等級集成材１０ａの重量が計量器４によって測定された後、その下面が２点で支持された状態で、打撃機５によって打撃される。続いて、この打撃によって生じるたわみ振動の振動数を、加速度センサー（振動検出器）６によって測定する。   Next, after the weight of the different graded laminated material 10a is measured by the measuring instrument 4 by this measurement start signal, it is hit by the hitting machine 5 with its lower surface supported at two points. Subsequently, the frequency of the flexural vibration generated by the impact is measured by the acceleration sensor (vibration detector) 6.

そして、計測用プロセッサー３によって、異等級集成材１０ａの重量、寸法およびたわみ振動数に基づいてヤング率を算出し、そのヤング率を上位コンピューター１に送信することで、この異等級集成材１０ａの強度を把握することができる。   Then, the measurement processor 3 calculates the Young's modulus based on the weight, size and deflection frequency of the different graded laminated material 10a, and transmits the Young's modulus to the host computer 1 so that the different graded laminated material 10a The strength can be grasped.

なお、通信用プロセッサー２は操作・表示用表示器２ａを備え、計測用プロセッサー３も操作・表示用表示器３ａを備えている。また、計量器４は増幅器４ａを備え、打撃機５はインターフェイス５ａを備え、さらに、加速度センサー増幅器６ａを備えており、これらによって正確な測定を促進している。なお、各機器はランで接続している。   The communication processor 2 includes an operation / display indicator 2a, and the measurement processor 3 also includes an operation / display indicator 3a. Further, the measuring instrument 4 includes an amplifier 4a, and the striker 5 includes an interface 5a, and further includes an acceleration sensor amplifier 6a, which facilitates accurate measurement. Each device is connected by a run.

こうした本実施形態に係る集成材強度測定方法は、異等級集成材１０ａの左右長手方向の中心から左右等距離の地点を下方から支持した状態で、中心を打撃機５で打撃してたわみ振動数を測定するものであるため、異等級集成材１０ａの強度を正確に測定することができる。   In such a laminated wood strength measuring method according to this embodiment, the deflection frequency obtained by hitting the center with the hitting machine 5 while supporting a point equidistant from the left and right from the center in the left and right longitudinal direction of the different grade laminated wood 10a. Therefore, it is possible to accurately measure the strength of the different graded laminated material 10a.

また、この測定方法は、異等級集成材１０ａを構成する各ラミナー１１の強度を測定する必要がないので、手数が掛からず、容易にその強度を測定することができる。   In addition, this measuring method does not require the measurement of the strength of each laminator 11 constituting the different graded laminated material 10a, so that it is possible to easily measure the strength without trouble.

なお、本実施形態に係る集成材強度測定方法では、強度の異なる複数のラミナー１１で構成される異等級集成材１０ａの強度を正確に測定することができるが、同一強度を備える複数のラミナー１１を積層して構成した同一等級集成材（同一等級構成集成材）の強度も、同様に正確に測定することができる。   In the laminated material strength measuring method according to the present embodiment, the strength of the different graded laminated material 10a composed of a plurality of laminators 11 having different strengths can be accurately measured, but the plurality of laminators 11 having the same strength are used. Similarly, the strength of the same graded laminated timber (same graded laminated timber) formed by laminating can be accurately measured.

１ 上位コンピューター
２ 通信用プロセッサー
２ａ 通信用プロセッサーの操作・表示用表示器
３ 計測用プロセッサー
３ａ 計測用プロセッサーの操作・表示用表示器
４ 計量器
４ａ 計量器用増幅器
５ 打撃機
５ａ 打撃機用インターフェイス
６ 加速度センサー
６ａ 加速度センサー用増幅器
７ 支点
８ 支持台
１０ 集成材
１０ａ 異等級集成材
１０ｅ 集成材の木口
１１ ラミナー
１１ｅ ラミナーの木口
１２ 接着剤
２０ 無垢材
２０ａ 無垢材の木口
２１ ハンマー DESCRIPTION OF SYMBOLS 1 Host computer 2 Communication processor 2a Communication processor operation / display indicator 3 Measurement processor 3a Measurement processor operation / display indicator 4 Weighing instrument 4a Measuring instrument amplifier 5 Batter 5a Batter interface 6 Acceleration Sensor 6a Acceleration sensor amplifier 7 Support point 8 Glue 10 Glulam 10a Different grade glulam 10e Glue top 11 Laminator 11e Laminar gutter 12 Adhesive 20 Solid wood 20a Solid wood gutter 21 Hammer

Claims (2)

複数のラミナー（１１）を積層して構成した集成材（１０）の強度をヤング率によって測定する方法であって、前記集成材の左右長手方向の中心から左右等距離の地点を支点（７）として下方から支持し、前記中心を打撃機（５）で打撃して，その打撃によるたわみ振動の振動数を測定し、前記振動数と，前記集成材の重量および寸法に基づいてヤング率を算出し，そのヤング率によって前記集成材の強度を測定することを特徴とする集成材強度測定方法。   A method for measuring the strength of a laminated material (10) constituted by laminating a plurality of laminars (11) by Young's modulus, wherein a point equidistant from the center in the left-right longitudinal direction of the laminated material is a fulcrum (7) The center is hit with a hitting machine (5), the frequency of flexural vibration due to the hit is measured, and the Young's modulus is calculated based on the frequency and the weight and dimensions of the laminated wood And measuring the strength of the laminated wood by its Young's modulus. 強度の異なる複数のラミナー（１１）を積層して構成した異等級集成材（１０ａ）の強度をヤング率によって測定する方法であって、前記異等級集成材の左右長手方向の中心から左右等距離の地点を支点（７）として下方から支持し、前記中心を打撃機（５）で打撃して，その打撃によるたわみ振動の振動数を測定し、前記振動数と，前記異等級集成材の重量および寸法に基づいてヤング率を算出し，そのヤング率によって前記異等級集成材の強度を測定することを特徴とする集成材強度測定方法。   A method for measuring the strength of different graded laminated wood (10a) formed by laminating a plurality of laminars (11) having different strengths by Young's modulus, equidistant from the center in the left-right longitudinal direction of the different graded laminated wood Is supported from below as a fulcrum point (7), the center is hit with a hitting machine (5), the frequency of flexural vibration due to the hit is measured, the frequency and the weight of the different graded laminated lumber And measuring the strength of the different graded laminated wood based on the Young's modulus and calculating the Young's modulus based on the dimensions.
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