Name: masonry curtain walls and support systems
Uploaded: 2024-09-12T16:16:28.000Z
Duration: 1 min 20 s
Channel: JoVE

石積みのカーテンウォールは、建物の構造フレームによって支えられたレンガまたは石の石積みのベニヤの外装材です。
まず、鋼製の棚の角度が構造フレームのスパンドレルビームに固定され、断熱材がその上に配置されます。
次に、フラッシングを敷き詰め、石積みユニットをその上に直接置き、高接着モルタルを使用して固定します。
さらに、バックアップ壁は、中空コンクリート組積造ユニットを配置し、そのコアに垂直鉄筋をグラウト詰めることによって構築されます。その後、壁は耐風性と耐水性の材料でコーティングされます。 
その後、次の組積造ユニットのコースがバックアップ壁と水平になるように敷設され、続いて断熱材を挿入し、ジョイント補強材と組積造タイを配置します。このプロセスは、壁の望ましい高さに達するまで繰り返されます。 
あるいは、プレハブパネルを所定の位置に吊り上げて固定することにより、カーテンウォールを設置することもできます。
カーテンウォールには、垂直および水平の伸縮継手も設けられています。
さらに、カーテンウォールの後ろにウィープホールと一緒に空洞を設けると、構造への湿気の侵入を軽減できます。

石造カーテンウォール

Masonry Curtain Walls

石造カーテンウォールは、建物の構造によって支えられたレンガや石のベニア板を使用して、見た目も美しく機能的な外装システムを形成します。これらの壁は、2 つの主な手法で建てられます。1 つ目は石造ユニットの従来の積層、2 つ目はプレハブ パネルの使用です。従来の構造では、スパンドレル ビームに取り付けられたスチール製の棚アングルで支えられ、高結合モルタルで石造ベニア板ユニットがしっかりと固定されます。このシステムにはバックアップの壁が不可欠で、通常はコンクリート ユニットまたはスチール製スタッドで作られ、フラッシング、断熱材、内装仕上げをサポートします。バックアップの壁は、ジョイント補強材と石造タイを介してカーテンウォールに接続され、2 つの間の動きを可能にして構造の完全性を維持します。この方法には、温度変化を管理するために伸縮継ぎ目が組み込まれており、場合によっては、ベニア板の後ろに空洞と排水穴を設けて湿気の浸入を防ぎます。地上で組み立てられ、所定の位置に持ち上げられるプレハブパネルは、時間効率に優れています。レンガの配置、補強、コンクリートのオーバーレイ用のフォーム内にプラスチック ガスケット フォーム ライナーを使用して、耐久性のある統合パネルを作成します。

石積みのカーテンウォールは、建物の構造フレームによって支えられたレンガまたは石の石積みのベニヤの外装材です。
まず、スチール製の棚...

Education

JoVE Core

Civil Engineering

土木工学

Unit 1

ユニット1

Masonry

組積造

KEY TERMS AND CONCEPTS

主要用語と概念

masonry curtain walls and support systems

Masonry curtain walls use brick or stone veneer as an exterior cladding system. The veneer is supported by the building structure, so the wall can be both attractive and functional.

Two main construction methods are used for these walls. One method builds the masonry units in place through traditional layering. The other uses prefabricated panels that are assembled on the ground and then lifted into position.

In traditional construction, steel shelf angles attached to the spandrel beam carry the veneer. High-bond mortars help secure the masonry units. A backup wall, often made of concrete units or steel studs, sits behind the veneer and supports flashing, insulation, and interior finishes.

The backup wall is connected to the curtain wall with joint reinforcing and masonry ties. These connections allow movement between the two parts while helping preserve structural integrity. Expansion joints are also used to handle thermal changes. In some cases, cavity and weep holes behind the veneer help limit moisture ingress.

Prefabricated panels offer a faster option. Builders place brick, reinforcement, and a concrete overlay inside a form with a plastic gasket form liner. The finished panels are then set in place as durable, integrated wall sections.

Masonry Curtain Walls and Support Systems

masonry-curtain-walls-and-support-systems

composite masonry walls

Bonding and Materials in Composite Masonry

Composite masonry walls use two or more wythes, or vertical layers, of masonry to form one unified wall. The wythes may use the same material or different masonry materials. They are joined to work together as a single structure. These wythes can be bonded in several ways. Builders may use mortar-filled collar joints, grouted spaces, or rigid metal ties with reinforcement. Masonry header units can also connect the layers, but this method is rare. Metal ties are often preferred because they...

masonry cavity walls

Masonry Cavity Walls and Moisture Control

Masonry cavity walls use two wythes, or layers, with a hollow space between them. The outer and inner wythes are linked only by corrosion-resistant metal ties. This design helps manage water and improve wall performance. When rainwater passes through the outer wythe, it moves down through the cavity. Flashing catches the water and directs it toward weep holes, where it can leave the wall. The inner wythe often has damp-proofing on the cavity side. This layer also works as an air barrier. The...

masonry loadbearing walls

How Masonry Walls Support Buildings

Masonry load-bearing walls support floors and roofs and carry those loads down to the foundation. They are built from brick, stone, or concrete masonry units. These walls rely on compressive strength, which means they can resist pushes from above very well. Masonry walls may be reinforced or unreinforced, depending on the building needs. They carry dead loads and live loads while using working stresses that stay below the materials' ultimate strength. That safety margin helps the structure...

masonry curtain walls

Masonry curtain walls use brick or stone veneer as an exterior cladding system. The veneer is supported by the building structure, so the wall can be both attractive and functional. Two main construction methods are used for these walls. One method builds the masonry units in place through traditional layering. The other uses prefabricated panels that are assembled on the ground and then lifted into position. In traditional construction, steel shelf angles attached to the spandrel beam carry...

posttensioned masonry walls

How Masonry Walls Gain Extra Strength

Post-tensioned masonry walls gain extra strength from high-strength steel rods or flexible tendons. These tensioning elements are anchored to the foundation and run vertically through the wall. In some walls, they sit inside the cores of the masonry units. In others, they are placed between the masonry wythes, or layers. The wall is built first with the tensioning elements already in place. After the mortar cures fully, the wall is tightened. Steel rods are tensioned by turning nuts against...

cavity drainage and flashings in masonry walls

cavity-drainage-and-flashings-in-masonry-walls

Moisture Control in Masonry Cavity Walls

Masonry cavity walls use a gap between two wythes, or wall layers, to help control moisture. The cavity is usually at least 2 inches wide, and it may contain insulation. Even with insulation, a clear space of at least 1 inch is kept so water can drain away. Some walls also use a continuous drainage mat to reduce the needed space while still moving moisture out. Weep holes are another key part of cavity drainage. These openings sit at the base of the cavity and let collected water escape. They...

thermal insulation in masonry walls

Masonry Wall Insulation Options

Masonry wall insulation can be placed on the outside, inside the wall, or on the interior surface. The best choice depends on the climate, the building design, and whether the wall is being built new or retrofitted. In hot, dry climates, masonry can help smooth indoor temperatures by absorbing heat during the day and releasing it at night. In many other climates, extra insulation is needed to improve thermal resistance. One common exterior method is an Exterior Insulation and Finish System, or...

expansion and contraction in masonry walls

expansion-and-contraction-in-masonry-walls

Masonry Wall Joints for Temperature and Moisture

Masonry walls change size slightly as temperature and moisture change. Builders account for this movement so the wall does not crack or shift out of place. Thermal movement is usually easy to measure and plan for. Moisture movement is harder to predict. New clay masonry units often absorb water and expand over time in normal outdoor conditions. New concrete masonry units behave differently. They usually shrink as they lose extra moisture gained during production. These opposite changes make...

movement joints in buildings

How Buildings Handle Structural Movement

Buildings are designed to handle movement from temperature changes, moisture changes, and structural deflection. If these changes are ignored, they can cause visible damage or even unsafe conditions. Movement joints give building materials room to move without creating distress. Working joints are the simplest type. They are placed during construction and help materials cope with change as the building goes up. Shingled roofs and wood bevel siding are common examples because they can move with...

types of building separation joints

Building Joints for Movement and Stability

Building separation joints help large or complex buildings move in a controlled way. They split a structure into smaller, separate units. This reduces stress when the building shifts under different forces. The joints are grouped into three main types: volume-change joints, settlement joints, and seismic separation joints. Volume-change joints handle expansion and contraction caused by temperature changes and moisture changes. They are placed where the building mass has discontinuities,...

efflorescence in masonry

Stopping White Salt Crystals on Masonry

Efflorescence is the white, fluffy crystal layer that can form on masonry walls. It happens when water-soluble salts in brick, stone, concrete, or mortar are dissolved by water and carried to the surface. When the water evaporates, the salts are left behind as a powdery deposit. New efflorescence is often seen soon after construction. In many cases, it can be cleaned with water and a brush. It may also fade over time as rain leaches salts out of the masonry surface. If efflorescence appears...

mortar joint deterioration in masonry

Repairing Damaged Mortar Joints in Masonry

Mortar joints in masonry can break down when water collects in them and freezes. The repeated freezing and thawing makes the water expand and shrink. That process creates cracks in the joints and can spread damage over time. As the mortar worsens, pieces may spall, or break off from the joint surface. Loose masonry units can follow, and the wall becomes weaker. Damaged joints also let moisture move into the wall, which adds to the problem. Good construction helps protect mortar joints. Using...

masonry in cold and hot weather conditions

masonry-in-cold-and-hot-weather-conditions

Protecting Mortar During Weather Changes

Masonry work changes in cold and hot weather because mortar must stay at the right temperature and moisture level. If mortar freezes before it cures, its strength and watertightness can drop. For proper hydration and curing, mortar should stay between 60°F and 80°F. When the weather is below 40°F, the water used for mortar must be heated. The water should not exceed 120°F, because very hot water can reduce compressive strength and bond strength. Masonry units and sand should also stay dry and...

masonry paving

Masonry Paving Materials and Base Layers

Masonry paving uses bricks, stones, and concrete masonry units to create durable walking and driving surfaces. These materials are selected for their shape, color, strength, and resistance to abrasion and weathering. Masonry units can be used in different paving setups depending on the site and the load they must carry. Some paving systems are installed dry on a thin sand layer over a gravel base. Others are set in mortar or asphalt on a concrete slab. For areas with heavy vehicular loads, a...

key terms and concepts

Learn how masonry curtain walls use brick or stone veneer, backup walls, shelf angles, ties, expansion joints, and prefabricated panels in building design.

Masonry Curtain Walls and Support Systems | 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

Masonry Curtain Walls and Support Systems

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