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,線(xiàn)條在安裝時(shí)由多根連接,接頭在施工中處理多用1:2水泥沙漿填縫,其熱膨脹系數與GRC水泥制品不同。造成裂縫;再有GRC線(xiàn)條安裝時(shí),尤其是水平方向線(xiàn)條未留伸縮縫,當氣溫變化時(shí)在接頭被拉開(kāi)或擠裂,而產(chǎn)生裂紋。

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、避免隱患

2. Avoid potential safety hazards

避免GRC構件在預埋鋼骨架的位置產(chǎn)生順?shù)摻罘较虻匿P脹裂縫GRC構件中的預埋骨架鋼筋和預埋件應采用鍍鋅鋼筋或不銹鋼條,或采用其他防銹處理,以避免銹脹裂縫的產(chǎn)生,隱患。

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、建筑外觀(guān)不受影響

3. The architectural appearance is not affected

GRC線(xiàn)條的滲水及墻面污染外墻面GRC線(xiàn)條在安裝使用后,尤其是水平線(xiàn)條下邊遇雨天便滲出雨水,線(xiàn)條上口的雨水也沿著(zhù)線(xiàn)條流向墻面,把線(xiàn)條上的積灰帶到外墻面。在外墻面形成條條污跡印,嚴重污染了墻面,影響了建筑物的外觀(guān)。

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.

形成這種病害的主要原因一是因為線(xiàn)條在安裝時(shí)未將舊建筑物安裝線(xiàn)條處墻面粉刷層鑿除再粉刷或新建筑物是先粉刷后安裝線(xiàn)條,再補縫;二是因為水平線(xiàn)條或柱的頂面蓋板口未找坡、未做滴水線(xiàn),導致雨水從線(xiàn)條上口進(jìn)入線(xiàn)條內,從線(xiàn)條下口流出或沿線(xiàn)條流向外墻面,造成墻面污染。

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 、達到施工要求

4. Meet construction requirements

GRC線(xiàn)條在外墻上安裝時(shí),一般是根據生產(chǎn)廠(chǎng)家提供的安裝圖,在外墻面上安裝8~10的普通膨脹螺栓,然后用中?準6鋼筋將其與線(xiàn)條上預埋鋼筋焊接,或者是直接用膨脹螺栓將裝飾凸塊、窗頂花固定在墻面上。

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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