Taking the low-strain dynamic testing curves of rotary drilling cast-in-place piles for the Shuiyang River Bridge as example,this paper analyzed the effects of pile head laitance and pile shaft belly on the low strain dynamic testing curves.

Based on the contrast of grouting and re-beating of floating piles,the latter should be adopted in soft soil foundation.

Aimed at the phenomena of floating pile in construction of 100000 m2 high building with prestressed concrete pipe piles,the influence of floating on shaft resistance,toe resistance and bearing capacity of pile were studied through the analysis of static load tests of engineering piles.

For possible floating piles in strengthening weak foundation of highway with cement mixing piles, the relationship be-tween total settlement of the foundation and thickness of underlying un-strengthened soil layer is derived on the basis of two models.

Vibrating fly ash concrete is easier to present laitance than normal concrete,because the fly ash particles are lighter than Portland cement particles.

Five full-scale reinforced shear wall models are tested to study the influence of five different thicknesses of pouring layers and vibrating modes on laitance thickness,shrinkage crack and control of strength and temperature of C70 high strength concrete shear walls.

On construction technique of shaping cast-in-place bored pile head at a time;

The underground construction of an edifice in Beijing has as many pile heads as more than 180 pieces.

Adding CCCW agent to cement mortar makes surface treatment and curing of concrete more convenient and waterproofing design of construction joint,pile head and post-pouring joint simpler.

Analysis of base-grouted pile under axial load;

Objective: To explore the clinical experience of vaginal delivery of primiparas with float fetal head.