Concrete Double Expansion Anchor

    Concrete double expansion anchors are used to anchor and fix in concrete, brick or block foundation materials. A mechanical bolt is screwed into the conical nut of the anchor body to make the double expansion shield anchor contact with the concrete of the hole wall at two points. The conical nut goes up with the rotation of the bolt and expands two shields to produce expansion effect. Double head expansion allows for better load retention.

    It is made of zamac alloy material, with rust proof, anti-corrosion, temperature resistant material characteristics, complete size specification can be supplied from 1/4 " to 3/4". During installation, the end with internal thread of double head expansion anchor is placed upward and flush with the base material plane. Double expansion is considered to be the best choice for use from the light to medium loads.

双锚是一种膨胀锚，适用于各种砌体基层材料，如砖、砌块或混凝土。双头锚的使用需要和机械螺栓一起使用实现膨胀锚的作用。

    It is a kind of zinc alloy expansion anchor, which is suitable for various masonry base materials, such as brick, block or concrete. The use of them need to be used together with mechanical bolt to realize the function of expansion anchor.

首先，必须在混凝土中钻一个孔，孔直径等于正在安装的双锚的外径，每个不同规格的直径需要不同尺寸的孔。钻孔的最小深度必须与双锚的长度相等，以确保锚均匀或低于基材表面。 钻孔后，用锤子轻轻敲打，将双锚放入孔中，以便放置。将安装物放在锚上，然后插入机械螺栓并转动以扩张护盾完成锚固操作。

    First, a hole must be drilled in the concrete with a diameter equal to the outer diameter of the double anchor being installed. Each diameter of different specifications requires a different size of hole. The minimum depth of the hole must be equal to the length of the double anchor to ensure that the anchor is even or below the surface of the substrate. After drilling, gently tap with a hammer to put the double anchor into the hole for easy placement. Place the fixture on the anchor, then insert the mechanical bolt and rotate to expand the shield to complete the anchoring operation.

双膨胀锚由四个部分组成：两片管状护盾、一个空心无螺纹的楔形锥体和一个带内螺纹的楔形螺母，组成一个单一的锚固装置。防护罩由一对弹簧带连接。每一个都设计成在膨胀过程中不会转动。

    The double expansion anchor consists of four parts: two heavy shields, a hollow non threaded cone nut and a tapped cone nut with internal thread, which constitute a single anchorage device. The guard is connected by a pair of spring bands. Each is designed not to rotate during expansion.

双膨胀锚用于带有机械螺钉或机械螺栓的软砌体中，这些螺钉或螺栓暴露在振动或侧压力下。当双膨胀锚固定时，相对的两端互相拉动，导致锚体伸长。双膨胀锚不会断裂，并允许任何长度的紧固。也可用于比较软或者松散的基础的材料。

    Double expansion shield anchors are used in soft masonry with mechanical screws or bolts that are exposed to vibration or lateral pressure. When the double expansion anchorage is fixed, the opposite two ends pull each other, resulting in the elongation of the anchor body. Double expansion anchors will not break and allow tightening of any length. It can also be used for soft or loose foundation materials.

**The zinc alloy single expansion anchors are  available.