Experimental Study On Mechanical Properties Of Inserts In Lightweight Aggregate Concrete

With the speeding up of the pace of urbanization in our country,has the advantages of saving resources,shorten the duration of the prefabricated construction has been developing rapidly,it makes greater demands of the prefabricated construction for safety design.With prefabricated assembly is the key link in construction safety,from prefabricated demoulding,flip maintenance operation to lifting transport hoisting and installation,lifting is an important part of the prefabricated construction process throughout the various nodes in the construction process.However,the difference of the hoisting mode and the hoisting system can cause the precast member to be unbalanced in the hoisting process,the hoisting deviation is large,and even the components can be damaged.Therefore,the use of special metal presets and hoisting tools in the design and construction of the hoisting are becoming more and more prominent.With the development of modern architecture gradually to the higher and higher level,the prefabricated components of lightweight concrete have been developed rapidly to reduce structural self-weight and improve thermal insulation performance.Therefore,it is necessary to study the folding coefficient of the bearing capacity of the embedded crane and its influencing factors based on the base material of lightweight aggregate concrete.According to the construction form and mechanical characteristics of the embedded hoisting pieces,it is divided into six categories:the bottom class,the reinforcing class,the endomorphic type,the braced column,the "short version" and the bottom of the plate.In this paper,the hoisting parts of the hoisting parts are mainly for the expansion of the extension of the bottom,the joint anchor and the tapered end of the taper end bolt and the lifting pipe fitting.The study on the change trend of the bearing capacity and its failure mode in the slurry concrete and ceramic concrete.Through will,in accordance with the "regulations of technology of concrete structure after anchorage","ACaI318","CEN15728" tension bearing capacity calculation formula of the ultimate load standard for the theoretical value and test value contrast to get embedded hung a reduction factor in lightweight aggregate concrete.54 specimens by drawing experiment was carried out,and the trass concrete base material specimen and ceramsite concrete base material specimen all 27,analysis of different embedded a string failure pattern and the reasons in the lightweight aggregate concrete.Results show that the expansion of bottom fork lift plate due to its structural form and bifurcation Angle is less prone to pull out at the bottom of the damage,joint bolt specimen all happen vertebral body destruction,wear jin class side eye bolt and ascending pipe caused by the tail muscle the role of its bearing capacity is higher.Furthermore,the larger the bearing capacity of the embedded crane,the higher the strength of the concrete.For different types of preburied cranes,its bearing capacity does not necessarily increase with the increase of embedded depth and concrete strength.The bearing capacity is also directly related to the diameter of the sling.Through the comparative analysis of the standard value and the test value,the ultimate bearing capacity of the test is greater than the theoretical value of the theory,of which the theoretical calculation value of British Standard "CEN/TR15728" is the largest,followed by the theoretical calculation value of American Standard "ACI318" After anchoring technical regulations "the theoretical calculation of the smallest.The ratio of the test bearing capacity to the theoretical value of the gauge,"CEN/TR15728" is the most stable,which shows that using this formula to calculate the bearing capacity of the precast hanger is reasonable and should be the main theoretical basis.