With the continuous development of science and technology, many new types of materials have emerged. However, the masonry structures still cannot play an important role in building construction. Masonry structures are still an important form of housing construction in today's civil engineering.
Masonry structure history
Masonry structure is the oldest kind of building structure. China's masonry structure has a long history and brilliant record. In history, the world-famous Great Wall of China is one of the world's greatest masonry projects constructed more than 2,000 years ago with the “Qin Brick Hanwaâ€; the Dengfeng Temple in Henan was built in the Northern Wei Dynasty. The 40-meter-tall brick-built tower.
Anji Bridge, Zhaoxian County, Hebei Province, built in the year of Da Yiye, with a net span of 37.37 meters, a total length of 50.82 meters, a width of 9 meters and an arch height of 7.2 meters. It is the world’s earliest hollow stone arch bridge, which has been used by American Civil Engineers. The Engineering Society has been selected as the 12th civil engineering milestone in the world; and the Dujiangyan Water Conservancy Project built by Li Bing and his son, who are still irrigated in the Qin Dynasty. All these are worthy of our pride and succession.
Masonry structure acceptance
1. If the surface roughness, verticality, thickness of mortar joint or fullness of mortar is unqualified, the above “four degreesâ€, if not qualified, will cause the bond between the block and the mortar to be destroyed, affecting the integrity of the masonry and Bearing capacity. Corrections will be carried out before the initial setting of the mortar, and all positions should be followed by inspections and timely corrections. The sooner the correction is, the easier it is to correct, and the correction must not be made after final setting.
2. If the pre-burial hole is not in accordance with the requirements when the masonry and masonry is not in place, if the pre-burial hole is not reserved according to the requirements, some construction parties will cut it after the masonry work is completed. This is not feasible and will affect the overall quality of the masonry. . Therefore, before the construction, we should carefully review the drawings of various specialties, strengthen communication and coordination, do a good job of inspection and acceptance of concealed projects, and forbid the construction of masonry projects after completion.
3. If the hard leveling and soft slurry are not performed on the top surface of the masonry, the hard leveling and soft slurry will cause gaps between the components and the supporting surface, resulting in poor structural integrity. It should be noted that the top surface of the masonry should be 1:2. After the cement mortar is leveled and reaches the required strength, a layer of cement mortar is laid. After the cement mortar is set, the components are installed. Note that the bottom of the control member can be evenly pressed on the soft mortar without leaving any gaps.
4. Mixing of different types of cement mixed mortar Mixing of different types of cement can cause changes in the physical properties of the material, or even a decrease in strength, which can lead to serious quality accidents. Therefore, the use of different types of cement is strictly prohibited. Should pay attention to strengthen management, according to the variety, intensity level, date of manufacture, batch number and other indicators to classify the cement, clearly marked. It should also indicate the results of “to be testedâ€, “checkedâ€, “qualified†and “unqualifiedâ€, and carefully check the type before using cement.
5, failed to set temporary positions
Failure to set up a temporary location will result in an unsatisfactory overall quality. In the actual construction, the height difference of the temporary interruption site shall not exceed the height of the one-step scaffolding; the top of the temporary hole shall be provided with lintels, and the ribs shall be embedded horizontally and the net width shall be less than 1m.
6, the quality of mortar is not qualified
Frequent problems such as random changes in mix ratio, long storage time, etc., can cause mortar strength to decrease, which in turn leads to inadequate masonry load capacity. Before the construction, the mix ratio shall be determined through the laboratory, and it is strictly forbidden for the construction party to change it at random; the mortar shall be used with the mix, and when the temperature is high, the method of mixing less and more shall be adopted.
Summary: The above is the content of the masonry structure history and acceptance that Xiaobian introduced to everyone. I hope that we can effectively help everyone. For more information, please pay attention to this site.
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