【正文】 施： a 設(shè)置袋裝砂井或塑料排水板，用來消除部分超孔隙水壓力，減少擠土現(xiàn)象。如果樁身裂縫很深，而且樁傾斜較大，沉井接樁也不能實(shí)施。采用表層鋪設(shè)塘渣、枕木、路基箱等方式加固地基，分散樁機(jī)荷載。當(dāng)?shù)鼗韺又写嬖诖髩K石頭等障礙物時(shí)，要避免壓偏。 pile treatment. 1 Introduction Currently, highstrength prestressed concrete pipe has been applied to housing construction and bridges, piers and other projects. Highstrength prestressed concrete pipe (PHC) with its high strength concrete pile, wide adaptability, good impact resistance, peration, with high capacity, flexural cracking good performance, construction speed, convenience, quality reliability, durability and good, and is widely used in highrise building foundation. Pipe is soil paction piles, construction speed, a large number of injections in soft soil area, the soil pore water pressure, excavation without effective control, will cause partial piles, such as the quality of the broken pile accident . Therefore, we must for the quality characteristics of soft soil in the pipe construction, earth excavation techniques and adopt effective measures to guarantee the progress of pile foundation and excavation. 2 Process Principle High water content soft soil has a natural, natural void ratio, high pressibility, 7 low shear strength, coefficient of consolidation, consolidation for a long time, high sensitivity, disturbance of the large, poor permeability, plex distribution of soil layer, the physical and mechanical properties between the layers of difference between the larger, vertical, horizontal squeeze all prone to , because of its large water content, poor permeability, squeezed easily have a greater excess pore water pressure, and difficult to disperse in a short time. The coefficient of consolidation, consolidation characteristics of a long time and disturbed the soil after it difficult to quickly recover. Highstrength prestressed concrete pipe pile to soil paction, construction, faster, and the resulting soil paction within the construction area effect. Pile itself high pressive strength, flexural strength but low levels of power between the different role of soil prone to pile fracture. Therefore, the construction of soft soil on the earth excavation pipe has a great impact. Excavation of the deployment and technical measures, should be around to avoid excessive soil stress release, to avoid excessive construction load of soil, reasonable control of soil displacement and stress release, such principles. 3 Operating Points Excavators deployed 1) The basis of soft soil prestressed concrete pipe replacement rate is generally around 4%, before excavation practical understanding of the following circumstances under which the preparation of excavation construction plan, deploy, and technical measures clearly digging: a site geological conditions, b around adjacent building (structure) and the need to protect the pipeline case, c enclosure design, d pile length, pile spacing, pile foundation design exchange rate situation, e piling order, piling records and other