Name: wood fastener types and uses
Uploaded: 2024-09-12T16:16:32.000Z
Duration: 1 min 18 s
Channel: JoVE

木造構造物では、留め具が部品を所定の位置に保持します。接続強度は、主に直接部材のベアリングに依存します。
釘のようなさまざまな留め具は、ハンマーや機械式ガンで木に打ち込まれた鋭利な金属ピンです。
爪にはさまざまな種類があり、直径、頭、長さが異なります。
フェースネイリング、エンドネイリング、トゥネイリングは、木の部材を釘で固定するために使用される3つの技術です。
螺旋状のねじ山がついた留め具であるねじには様々な種類があり、ねじる動作を施して木材にしっかりと埋め込むことで取り付けます。
この動作により、ねじ山がネジを固定している材料にしっかりと引っ張ります。
あらかじめ開けられた穴にレンチでボルトを挟み込み、ボルトヘッドと反対側のナットを回し、ボルトを締めて固定します。
ボルトヘッドとナットの下にあるフラットスチールワッシャーは、より広い木材領域に力を分散し、繊維の破砕を減らします。
スプリットリングコネクタ、歯付きプレート、および金属フレーミングデバイスも、固定の目的を果たすために木材部材の接続に使用されます。

木材用の留め具

Wood Fasteners

木造建築では、留め具は部品を固定するために不可欠です。接続の強度は、部材間の支持の強度に大きく依存します。様々なタイプの留め具が使用され、それぞれが特定の用途と構造要件に適しています。

釘は最も一般的な留め具で、ハンマーまたは電動機器を使用して木材に打ち込まれる、先の尖った金属ピンです。釘には様々な直径、頭、長さがあります。釘打ちの技法には、面打ち、端打ち、つま先打ちがあり、それぞれの方法によって木材部材の接続の角度と強度が異なります。

ネジは別のタイプの留め具で、螺旋状のねじ山が特徴で、木材にねじ込むとしっかりと固定されます。取り付けには、ねじを木材に引き込むねじり動作があり、堅固な固定部を形成します。ネジには様々なタイプがあり、それぞれ特定の用途向けに設計されています。

ボルトはより堅牢に木材を結合します。ボルトは、事前にドリルで開けた穴に挿入されるねじ付きの留め具です。ボルトを固定するためにナットが使用され、ナットはレンチで締め付けられます。ボルトの頭とナットの下に平らなスチール製のワッシャーを配置すると、力がより広い範囲に分散され、木材繊維の潰れが防止されます。

スプリットリングコネクタ、歯付きプレート、金属フレームデバイスなどのその他の留め具も、木造建築において重要な役割を果たし、木造建築の耐久性と完全性を高めます。これらの留め具は、構造の安定性を維持し、木造建築の寿命を確保するために不可欠です。

木造構造物では、留め具が部品を所定の位置に保持します。接続強度は、主に直接部材のベアリングに依存します。
釘のようなさまざまな留め具は...

Education

JoVE Core

Civil Engineering

土木工学

Unit 1

ユニット1

Wood

KEY TERMS AND CONCEPTS

主要用語と概念

wood fastener types and uses

Wood fasteners connect parts of a wood structure and help keep members in place. The strength of the connection depends mainly on direct bearing between the wood members. Different fasteners are chosen for different jobs and structural needs.

Nails are the most common wood fasteners. They are sharp-pointed metal pins that are driven into wood with a hammer or a mechanical nail gun. Nails come in many diameters, head styles, and lengths.

Nailing methods also matter. Face nailing places the nail through the face of one member. End nailing drives the nail into the end of a board, and toe nailing places it at an angle for a stronger connection between members.

Screws use spiral threads to hold firmly in wood. A screw is twisted into place, and that turning motion pulls it deeper into the wood. Different screw types are made for different uses.

Bolts provide a stronger connection and are used with predrilled holes. A nut secures the bolt, and a wrench tightens the nut. Flat steel washers under the bolt head and nut spread the force over a larger area and help prevent the wood fibers from being crushed.

Other wood connectors also support strong construction. Split-ring connectors, toothed plates, and metal framing devices help improve the durability and integrity of wood structures. These fasteners are important for structural stability and for helping wood constructions last longer.

Wood Fastener Types and Uses

introduction to wood

Wood Structure and Uses in Building

Wood is a construction material made from trees. A tree trunk has several layers. The outside is a protective layer of dead bark. Under that is living bark, then the cambium, then sapwood. As sapwood matures, it becomes heartwood. The pith sits at the center of the trunk. The age of a tree can be read from its growth rings. These rings are concentric bands seen in a trunk cross-section. Wood strength also depends on grain. Grain refers to elongated, tubular cells that run along the length of...

softwoods and hardwoods

Wood Grain in Softwoods and Hardwoods

Softwoods and hardwoods come from different kinds of trees, and their leaf structures and cell makeup help explain how they are used. Softwoods come from cone-bearing trees with needle-like leaves. Hardwoods usually come from trees that shed broad leaves seasonally. Softwoods are made mostly of long cells called tracheids and a smaller number of rays, which are radial cells. This simpler structure gives softwoods a rougher grain. Because of this, they are often used in construction for...

lumber

Lumber Cutting Methods

Lumber is made from logs that are harvested, debarked, and processed into long pieces with a rectangular cross-section. The process starts when an automated saw slices a log into slabs. Those slabs then move on a conveyor belt to smaller saws, where they are cut into square-edged pieces of specific widths. Freshly cut lumber usually has rough surfaces. Its dimensions may also vary slightly from one end to the other. The way wood is cut affects both the lumber’s appearance and how it is used. <br...

structural properties and dimensions of lumber

structural-properties-and-dimensions-of-lumber

Wood Strength Tests and Lumber Sizes

Wood strength depends on how its fibers are aligned along the length of the tree. This alignment gives wood much greater tensile strength along the grain than across it, sometimes up to twenty times higher. Wood also tends to perform better under compression than under tension. Fiber length varies by wood type. Hardwoods have fibers about one twenty-fifth of an inch long. Softwoods have longer fibers that range from one-eighth to one-third of an inch. Laboratory tests help measure how wood...

seasoning of wood

Wood Drying for Stronger Construction

Seasoning of wood is the drying process used to lower and stabilize moisture content before wood is used in construction. Fresh wood can swell when it takes in moisture and contract as it dries. Seasoning helps reduce that movement so the wood stays more stable after it is built into a structure. The main goal is to reach equilibrium moisture content. This is the point where the wood’s moisture level matches the moisture in the surrounding environment. When wood is seasoned properly, it is...

wood surfacing

Wood Surfacing for Smooth, Safe Lumber

Wood surfacing smooths lumber, improves its size accuracy, and makes it safer to handle. It is a key finishing step in woodworking and construction. The process also helps correct small distortions that can form as wood dries. Before surfacing, the wood may be sized slightly larger to account for shrinkage during seasoning, which is the drying stage. A plane, a tool with rotating blades, is used to remove material and smooth the surface. The same tool can also round the edges a little, which...

lumber defects

Common Wood Flaws in Lumber

Lumber defects are flaws in wood that can change both its appearance and its strength. These defects come from tree growth and from the way lumber is processed. Knowing the main defects helps explain why some boards are better for construction and manufacturing than others. Some defects begin in the tree itself. Knots form where branches were once attached to the trunk, and knotholes appear when those knots fall out. Decay and insect damage are also natural defects that can weaken wood and...

wood fasteners

Wood fasteners connect parts of a wood structure and help keep members in place. The strength of the connection depends mainly on direct bearing between the wood members. Different fasteners are chosen for different jobs and structural needs. Nails are the most common wood fasteners. They are sharp-pointed metal pins that are driven into wood with a hammer or a mechanical nail gun. Nails come in many diameters, head styles, and lengths. Nailing methods also matter. Face nailing places the...

veneer

How Veneer Is Cut and Used

Veneer is a thin sheet of wood that is usually about one-eighth of an inch thick or less. It is made to show the look of wood while using timber more efficiently. Veneer is common in furniture and other finished wood products. One common way to make veneer is rotary cutting. In this method, a log is mounted in a large lathe and spun against a knife edge. As the knife moves deeper into the turning log, it peels off a continuous strip of wood. This creates rotary-cut veneer. Other veneer...

wood products

Engineered Wood Products in Construction

Engineered wood products are made from wood strands, veneers, lumber, and even waste wood shreds. They are used in both structural and nonstructural building applications. These materials are designed to improve strength, durability, and versatility in modern construction. Glue-laminated wood, or glulam, is made by bonding several smaller pieces of dimensional lumber with adhesive. Cross-laminated timber uses solid lumber panels with layers placed so the grain direction alternates. This layer...

wood panel products

Types of Wood Panels in Construction

Wood panels are common construction materials used for flooring, siding, and roofing. They usually come in standard 4-foot by 8-foot sheets. Their thickness can range from one-quarter of an inch to one and one-eighth inches. Plywood is one of the most familiar wood panels. It is made by gluing thin wood veneers, or layers, under pressure. The outer veneer grain runs lengthwise, while the inner layers run widthwise. Plywood also has an odd number of layers, which helps keep the panel...

key terms and concepts

Learn how nails, screws, bolts, washers, and other wood connectors hold wood members together and support strong, stable construction.

Wood Fastener Types and Uses | JoVE K12

JoVE Core Civil Engineering provides a foundational exploration of essential construction materials in civil engineering, focusing on bricks, stones, steel, wood, and concrete through easy-to-understand animated videos. This collection covers the properties, manufacturing processes, and practical applications of these materials. Additionally, the accompanied science-in-action videos demonstrate the research experiments performed in laboratories.

civil engineering

Wood Fastener Types and Uses

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