Polymer material grouted wedge precast pile technique

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 high polymer material grouting wedge-shaped prefabricated pile technology. 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. [0002] Background technique [0003] 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 pat...

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Problems solved by technology

Chinese patent "Pile Sinking Method of Synchronous Grouting Static Pressure Prefabricated Pile" (ZL 200710185371.1); Chinese Patent "Construction Method of Static Pressure Immersed Tube Expanding Bottom Concrete Pile" (ZL 200810055309.5) and Chinese Patent "Construction of Grouting Internal Ramping Bottom Expanding Pile Pile-forming device and pile-forming method" (ZL 200910071377.5) discloses the technical schemes of post-grouting for the pile side and pile end of prefabricated piles; these construction methods can improve the pile-soil contact surface characteristics to varying degrees, increase the However, these technical solutions all use cement slurry for grouting, so the grouting effect such as the grouting strength, grouting pressure and the degree of improvement of the pile foundation bearing capacity are all limited by the cement slurry ; When pouring thick grout for a long time, the grouting pipe is easy to be 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; Recycling and reuse 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.

[0004] Chinese patents "Cement Concrete Pavement Void Identification and Polymer Grouting Rapid Repair Method" (ZL 200710054045.7); "Semi-rigid Base Pavement Disease Detection and Polymer Grouting Repair Method" (ZL 200710054044.2) "Rapid reinforcement method of polymer grouting" (ZL 200710054043.8) discloses a defect identification detection technology and polymer grouting method, which has fast detection speed and good reinforcement effect; however, polymer grouting technology has not yet been applied Field of pile foundation engineering

The Chinese patent "A Prestressed Conical Pipe Pile with Bottom Expansion and Its Construction Technology" (ZL 200810011854.4) 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. , and then lower the retractable control reinforcement cage, pour concrete, and form the prestressed wedge-shaped pile with expanded bottom; this method combines prestressed wedge-shaped pile with bottom expansion for the first time, not only using the wedge-shaped section to improve the pile side friction resistance, but also using the enlarged head Increased pile tip resistance; however, there are relatively many steps in this process, and the construction period is relatively long

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