History and acceptance of masonry structure

2022-07-22
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Masonry structure has a long history in China. Many places of interest are masonry structures left by the ancients. Masonry structure is a structure built by brick masonry, stone masonry or block masonry. Masonry structure is a main load-bearing structure in civil engineering

with the continuous development of science and technology, many new materials have appeared, but it still cannot shake the important position of masonry structure in housing construction. Masonry structure is still an important form of housing construction structure in civil engineering today

history of masonry structure

masonry structure is the oldest building structure. Masonry structures in China have a long history and brilliant records. In history, there is the world-famous Great Wall, which was used more than 2000 years ago “ Qin brick and Han tile ” One of the greatest masonry projects in the world; The Songyue temple tower in Dengfeng, Henan Province, built in the Northern Wei Dynasty, is a 40 meter high brick closely eaved tower

Anji bridge in Zhao county, Hebei Province, built in the Sui Dynasty, has a clear span of 37.37 meters, a total length of 50.82 meters, a width of about 9 meters, and an arch height of 7.2 meters. It is the world's earliest open spandrel stone arch bridge. The bridge has been selected as the world's 12th civil engineering milestone by the American Society of civil engineering; There is also the Dujiangyan water conservancy project built by Li Bing and his son in the Qin Dynasty, which is still used for irrigation today; All these are worthy of our pride and inheritance

acceptance of masonry structure

1. The surface flatness, perpendicularity, mortar joint thickness or mortar plumpness of masonry are more than unqualified “ Four degrees ” If unqualified, the bond between the block and mortar will be damaged, affecting the integrity and bearing capacity of the masonry. The correction shall be carried out before the initial setting of mortar, and all posts shall check and correct in time. The earlier the correction is, the easier it is to correct. The correction shall not be carried out after final setting

2. The embedded hole is not reserved as required during masonry

if the embedded hole is not reserved as required, some construction companies will excavate after the completion of masonry works, which is not feasible and will affect the overall quality of masonry. Therefore, before construction, we should carefully review the drawings of various disciplines, strengthen communication and coordination, do a good job in inspection and acceptance of concealed works, and it is strictly forbidden to excavate after the completion of masonry works

3. The top surface of the masonry is not hard leveled and soft grouted

if it is not hard leveled and soft grouted, there will be gaps between the components and the bearing surface, resulting in poor structural integrity. It should be noted that the top surface of the masonry is leveled with 1:2 cement mortar. After reaching the specified strength, a layer of cement mortar is laid, and the components are installed after setting. It should be noted that the bottom of the components can be evenly pressed on the soft mortar without leaving gaps

4. Mixing mortar with different kinds of cement

mixing and using different kinds of cement will cause changes in the physical properties of materials, and even reduce the strength, which will seriously lead to quality accidents. Therefore, mixing and using different kinds of cement is strictly prohibited. Attention should be paid to strengthening management. Cement should be classified and clearly marked according to varieties, strength grades, ex factory dates, batch numbers and other indicators. It should also be marked with “ To be inspected &rdquo& ldquo; Checked &rdquo& ldquo; Qualified &rdquo& ldquo; Unqualified ” And other results, carefully check the type before using cement

5. Unqualified setting of temporary parts

unqualified setting of temporary parts will lead to unqualified overall quality. In the actual construction, the height difference of the temporary discontinuous part shall not exceed the height of the scaffold in one step; Lintels shall be set on the top of temporary openings, and horizontal tie bars shall be embedded, with a net width of less than 1m

6. Unqualified mortar quality

common problems include changing the mix proportion at will, long storage time, etc. these problems will lead to the reduction of mortar strength, which will lead to the lack of masonry bearing capacity. The mix proportion shall be determined through the laboratory before construction, and it is strictly forbidden for the construction party to change it at will; Mortar should be mixed and used at any time. When the temperature is high, the method of mixing less and more times should be adopted

summary: the above is the history and acceptance of masonry structure introduced by the editor. I hope it can effectively help you. Please pay attention to more information

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