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LZ的信息不全！光凭照片很难给出意见！
1.房子？house？unit？........
2.砖结构? 全砖？砖板？
3.你自己又没装修改动过？
4.就图片而言，裂纹不是很大，走向在2个洞口位之间，有无其他延伸处？
WALL CRACKS
Regardless of their construction, walls crack because they are overloaded or because the structure has settled or heaved. Vertical and angled cracks are usually caused by settlement or heaving. Horizontal cracks are more likely to be load induced or caused by side pressure.
NOTE: Surface cracks that do not pierce the wall and are not accompanied by displacement are not structural in nature and should be distinguished from the cracks discussed here.
VERTICAL CRACKS: If a wall has an upwards overload adjacent to a downwards overload, it may crack vertically so that one side rises or sinks with respect to the other (Figure 1). Vertical cracks are usually caused by settlement, compaction, or soil eroding under the footing. Overloading from above can occur when framing members fail forcing loads to areas that were not designed for them. Similar cracks can also be caused by overloads from below, such as frost or hydraulic expansion of the soil.
ANGLED CRACKS: When up and down loads are applied so the forces are offset from one another, cracks are likely to occur at an angle (Figure 2). Cracks of this type may be found when there is a major discontinuity in the soil or if a building is built on expansive clays.
HORIZONTAL CRACKS: When a wall is overloaded from the outside, as from frost, soil pressure, or improper backfill, it may bow inward and crack horizontally (Figure 3). In a block wall, the crack is usually in a mortar joint and is wider on the inner face. An additional cause of horizontal cracking may be settlement of the foundation. If a foundation is laid on top of unstable soil, the wall which lacks the proper support could drop resulting in a horizontal crack without vertical displacement of the wall surface.
Note: Surface effects such as poor grading or improperly located downspouts can increase the amount of water pushing against the basement wall. |
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穿越澳大利亚 -- 墨尔本到达尔文 (2009-9-7) JackZhang 
发表于 2011-4-19 00:08
发表于 2011-4-19 14:13
