Polymer material grouted wedge precast pile construction method

Abstract

Disclosed is a polymer material grouted wedge precast pile technique. Grouting holes are reserved on the lateral wall of a prestressed wedged pipe pile, a polymer material is subjected to pressure grouting on the pile side and the pile ends, and accordingly bearing capacity of the pile side and the pile ends is improved. The polymer material for grouting is excellent in water proofing, and is small in size after swelled, the polymer material is quick in construction, strength improvement is quick, the dead weight of the polymer material is light, volume expansibility of the polymer material is high, and the problems of coagulation of cement slurry in a grouting pipe and the like are avoided. Compared with traditional prestressed pipe pile, the prestressed wedged pipe pile subjected to pressure grouting has improved bearing capacity of the pile side and the pile ends. By means of wedged angles, the form of pile-soil face contact is improved, and side friction of the pile is increased. By the polymer grouting technique compared with the traditional cement slurry grouting technical methods, expenditure and construction period can be reduced greatly, environment protection and energy conservation are benefited, and the quality is easier to control. The technique is simple in construction process, high in operability, convenient for quality control, evident in economic benefit and effective in soft soil foundation treatment.

Description

technical field [0001] The invention relates to the technical field of pile foundations, in particular to a construction method of high polymer material grouting wedge-shaped prefabricated piles. It is mainly applicable to engineering and technical fields such as foundation treatment of industrial and civil buildings, soft soil foundation treatment of coastal and riverside expressways, and railways. Background technique [0002] In the deep foundation of civil engineering, pile foundation is one of the most important foundation forms. Post-grouting prefabricated piles, by burying grouting pipes in the pile body, grouting the pile side, pile end or pile side pile end joint grouting to improve pile side friction and pile end resistance; post-grouting piles have wide adaptability, With technical advantages such as flexible construction methods and simple grouting equipment, it has been vigorously developed in China in recent years. Prior to the present invention, the Chinese ...

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Problems solved by technology

Chinese patent "Pile Sinking Method of Synchronous Grouting Static Pressure Prefabricated Pile" (ZL200710185371.1); Chinese Patent "Construction Method of Static Pressure Sinking Tube Expanding Bottom Concrete Pile" (ZL200810055309.5) and Chinese Patent "Screening Internal Rammer Expanding Bottom Pile-forming device and pile-forming method” (ZL200910071377.5) discloses the technical schemes of post-grouting for the pile side and pile end of prefabricated piles; these construction methods can improve the characteristics of the pile-soil contact surface to varying degrees and increase side and pile end resistance, and improve the overall bearing capacity of the pile foundation; however, these technical solutions all use cement grout for grouting, so the grouting effects such as grouting strength, grouting pressure, and the degree of improvement of pile foundation bearing capacity are all affected by the cement grout. Due to the limitation of the situation; when pouring thick grout for a long time, the grouting pipe is easily condensed by the cement slurry in the hole, and the bonding force between the cement grout and the side of the prefabricated pile is small; the grouting pipe is embedded in the prefabricated pile body in advance , cannot be recycled and reused, which is neither economical nor environmentally friendly; at the joints of prefabricated piles, the technical difficulty of grouting pipe connection is high, and the effect is not good.

[0003] Chinese patents "Cement Concrete Pavement Void Identification and Polymer Grouting Quick Repair Method" (ZL200710054045.7); Identification, rapid reinforcement method of polymer grouting” (ZL200710054043.8) discloses a defect identification detection technology and polymer grouting method, which has fast detection speed and good reinforcement effect; however, the polymer grouting technology is currently Not yet applied to the field of pile foundation engineering

The Chinese patent "A Prestressed Conical Pipe Pile with Bottom Expansion and Its Construction Technology" (ZL200810011854.4) discloses a construction process of a prestressed wedge-shaped pipe pile. The pile core soil and part of the soil at the pile end are cleaned manually or mechanically. Then lower the retractable control reinforcement cage and pour concrete to form the prestressed wedge-shaped pipe pile with expanded bottom; this method combines the prestressed wedge-shaped The head increases the resistance of the pile tip; however, the process steps are relatively many, and the construction period is relatively long

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