Cracks occur between adjacent GRC products after installation. Most of these cracks occur between GRC line joints with large vertical and horizontal length, resulting in obvious line segmentation and seriously affecting the effect of external finish. GRC product lines are mostly made into 1.5 ~ 3m / piece in external decoration, and multiple pieces are connected and installed together to outline the effect of external wall. On the one hand, due to its heavy self weight and uneven stress during installation, cracks occur between adjacent joints due to its self weight;

另一方面,线条在安装时由多根连接,接头在施工中处理多用1:2水泥沙浆填缝,其热膨胀系数与GRC水泥制品不同。造成裂缝;再有GRC线条安装时,尤其是水平方向线条未留伸缩缝,当气温变化时在接头被拉开或挤裂,而产生裂纹。

On the other hand, the lines are connected by multiple pipes during installation, and the joints are mostly filled with 1:2 cement mortar during construction, and its thermal expansion coefficient is different from that of GRC cement products. Cause cracks; In addition, when GRC lines are installed, especially the horizontal lines do not leave expansion joints. When the temperature changes, the joints are opened or cracked, resulting in cracks.

2、避免隐患

2. Avoid potential safety hazards

避免GRC构件在预埋钢骨架的位置产生顺钢筋方向的锈胀裂缝GRC构件中的预埋骨架钢筋和预埋件应采用镀锌钢筋或不锈钢条,或采用其他防锈处理,以避免锈胀裂缝的产生,隐患。

Avoid rust expansion cracks along the reinforcement direction at the position of embedded steel framework of GRC members. Galvanized reinforcement or stainless steel strip or other anti rust treatment shall be adopted for embedded framework reinforcement and embedded parts in GRC members to avoid rust expansion cracks and eliminate potential safety hazards.

3、建筑外观不受影响

3. The architectural appearance is not affected

GRC线条的渗水及墙面污染外墙面GRC线条在安装使用后,尤其是水平线条下边遇雨天便渗出雨水,线条上口的雨水也沿着线条流向墙面,把线条上的积灰带到外墙面。在外墙面形成条条污迹印,严重污染了墙面,影响了建筑物的外观。

The water seepage of GRC lines and wall pollution the outer wall. After the installation and use of GRC lines, especially in rainy days under the horizontal lines, the rainwater at the upper opening of the lines also flows to the wall along the lines, bringing the accumulated ash on the lines to the outer wall. Stains are formed on the outer wall, which seriously pollutes the wall and affects the appearance of the building.

形成这种病害的主要原因一是因为线条在安装时未将旧建筑物安装线条处墙面粉刷层凿除再粉刷或新建筑物是先粉刷后安装线条,再补缝;二是因为水平线条或柱的顶面盖板口未找坡、未做滴水线,导致雨水从线条上口进入线条内,从线条下口流出或沿线条流向外墙面,造成墙面污染。

The main reasons for this disease are as follows: first, the wall painting layer at the installation line of the old building is not chiseled out and then painted during the installation of the line, or the new building is painted first, then the line is installed, and then the joint is repaired; Second, because the slope of the top cover plate opening of the horizontal line or column is not found or the drip line is not made, the rainwater enters the line from the upper opening of the line, flows out from the lower opening of the line or flows outward to the wall along the line, resulting in wall pollution.

4 、达到施工要求

4. Meet construction requirements

GRC线条在外墙上安装时,一般是根据生产厂家提供的安装图,在外墙面上安装8~10的普通膨胀螺栓,然后用中?准6钢筋将其与线条上预埋钢筋焊接,或者是直接用膨胀螺栓将装饰凸块、窗顶花固定在墙面上。

When GRC lines are installed on the outer wall, 8 ~ 10 ordinary expansion bolts are generally installed on the outer wall according to the installation drawing provided by the manufacturer, and then use the medium? The quasi-6 reinforcement shall be welded with the embedded reinforcement on the line, or the decorative boss and window top flower shall be directly fixed on the wall with expansion bolts.

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