Research On The Design And Performance Of Standardized Components For Prefabricated Retaining Pile Wall

With the improvement of urban facilities and the increasingly crowded urban space,the foundation pit engineering problems encountered in the construction of buildings have become one of the research topics in the engineering community today.In this paper,a new type of retaining structure for foundation pit engineering is designed according to the characteristics of the force of foundation pit:prefabricated retaining pile wall.Because of its special cross-section form,it has greater bending stiffness,higher bending bearing capacity,and lighter weight.The combination of cement-soil piles(walls)can not only retain soil and stop water,but also greatly reduce the resistance and squeezing effect of the pile into the soil,and improves the convenience of construction.Compared with the traditional enclosure structure,it has the characteristics of cost saving,reliable quality,time-saving construction,environmental protection,and high adaptability.This paper introduces in detail the design and manufacturing process and requirements of the fabricated prefabricated retaining pile wall,improves the horizontal connection form,and designs a dovetail groove self-locking vertical connection joint.The design calculation method used in the actual foundation pit engineering retaining structure of the fabricated prefabricated retaining pile wall is given,and the detailed calculation process is given by taking the foundation pit engineering of a science and technology building as an example.Through ANSYS finite element numerical analysis,the force analysis of the two designed prefabricated enclosure pile walls was carried out,and the main conclusions obtained are as follows:(1)The flexural analysis of the designed hollow T-piles and dovetail trough prefabricated retaining pile walls was carried out using reinforced concrete integral modeling.The analysis results are similar to the cracking moment and flexural bearing capacity obtained by theoretical calculations,and it is verified that The feasibility of the design calculation method;(2)Under the conditions of equal cross-sectional area and load,the bending resistance of hollow T-shaped piles and I-shaped,rectangular,and circular cross-section piles are analyzed,and it is found that the bending resistance of hollow T-shaped piles is much greater than that of circular cross-section piles.For rectangular section piles,the flexural capacity of I-shaped cross-section piles is basically the same as that of hollow T-shaped piles.However,due to its special cross-sectional form,hollow T-shaped piles can be equipped with more tensile steel bars in the tension area and have higher flexural capacity;(3)The relationship between the section hollow rate of the dovetail groove prefabricated retaining pile wall and the bending capacity of the pile body is non-linear.Under the same load condition,the maximum displacement of the pile with 36.9%section hollow rate is about 8%higher than that of 31.9%section hollow rate.The maximum displacement of the pile with 31.9%section hollow rate is only about 1.4%higher than that with 26.9%section hollow rate;(4)Increase the rigidity of the composite structure by increasing the thickness of the cement-soil wall on the compression side of the composite structure of cement-soil and prefabricated retaining pile walls to reduce the pile displacement;(5)While keeping the size of the internal prefabricated retaining pile wall unchanged,as the thickness of the cement-soil in the compressed area increases,the proportion of the cross-section of the prefabricated retaining structure in the composite structure decreases,and the effect of cement-soil on the stiffness of the composite structure The more it improves.Figure[53]Table[8]References[51]...