The invention relates to a bag bottom expanding rigid-flexible combined pile. The bag bottom expanding rigid-flexible combined pile is formed by connecting the following prefabricated pipe piles including a TSC (prestress concrete thin wall concrete) pile, a PRC (prestress reinforcement concrete) pile and a PHC (prestress high-strength concrete) pile from top to bottom. The bottom end of the PHC pile is provided with a pile bottom expander packed by a bag; the inside of the prefabricated pipe piles is provided with a grouting duct; both ends of every pile is provided with perforated pipe pile joints, and the side wall of the pile at the bottom is provided with a grout outlet; the outside of the combined pile is packed by surrounding cemented soil. According to the bag bottom expanding rigid-flexible combined pile, based on the law of horizontal load bearing of the pile bodies inside soil, the prefabricated pipe piles with the anti-bending and anti-shearing performance gradually improved, which are connected in a combined mode, are sequentially planted inside the cemented soil, and the expanded is grouted after the bag with stable characteristics is set to improve the vertical bearing capacity of the piles, so that relatively higher technical and economical benefits can be obtained. The invention also discloses a construction method of the bag bottom expanding rigid-flexible combined pile.

Bag bottom expanding rigid-flexible combined pile and construction method thereof

The invention relates to a vertical reinforcing rib reinforced bag grouting pile and a construction method. The pile mainly comprises a prefabricated pipe pile, a prefabricated enlarged toe pile end with one part of the prefabricated pipe pile, a bottom filling enlarged toe pile end, a vertical reinforcing rib, a multi-section back expansion rib, a fixed disc, a bag, a steel plate pile tip, a pipe pile joint, a separate orifice positioning steel plate, a pile periphery reinforcing area, a grouting expanded bottom, a steel plate pile tip top pipe element, a top anchor plate and a foundation baseplate; pile connecting holes are respectively formed in the top and the bottom of the pipe pile; and an upper-section pile and a lower-section pile are connected through a pile connecting rod. An integral circular connecting inner sleeve and a separate arc connecting outer plate with a reverse triangular flange plate are sleeved in the pile connecting place by a stud and a nut. The technical method is convenient to construct, low in construction cost and low in technical requirements on engineering constructors, and can greatly improve the bend and shear resistance of the whole foundation pile. The method is simple in construction process, high in operability, convenient to control the quality, obvious in economic benefit and prominent in treatment effect.

Vertical reinforcing rib reinforced bag grouting pile and construction method

The invention discloses a post-grouting device for a pile end and pile side combination of a cast-in-place pile. The device comprises a reinforcement cage, a lateral elastic cavity which wraps the outer side of the lower part of the reinforcement cage, a side grouting device which is fixed to the reinforcement cage and used for grouting the lateral elastic cavity, and an end grouting device for grouting the end part of the reinforcement cage, wherein the lateral elastic cavity comprises an elastic film, and double-layer steel rings which are positioned at the upper end and the lower end of the elastic film and used for clamping the elastic film; the double-layer steel rings are fixedly connected to the reinforcement through steel bars, and a clearance is formed between the lateral elastic cavity and the reinforcement cage; the reinforcement cage is sleeved with a rubber air bag device; the elastic film sleeves the rubber air bag device; the rubber air bag devices are arranged close to the upper and lower double-layer steel rings in a sleeving manner. With the adoption of the device, the bearing capacity of a pile foundation can be effectively improved; the settling amount of the pile foundation is decreased; and the cost is greatly decreased. The device is simple in structure, reasonable in construction method, convenient to operate, safe, reliable, suitably mounted at a construction site, and convenient to popularize and apply.

Post-grouting device for pile end and pile side combination of cast-in-place pile and construction method thereof

The invention provides a slip-cast enlarged toe pile and a construction method thereof A pile body is to plant a steel pipe pile or a prestressed concrete pipe pile in a cement soil stirring pile to form a variable-section pile through oriented grouting; the pulling resistance and the compressive resistance of the pile are improved through extrusion and expansion of surrounding soil and the reinforcing effect on the cement soil stirring pile; meanwhile, the slip-cast enlarged toe pile is suitable for multiple soil layer regions; and under the precondition of retaining the advantages of the slip-cast enlarged toe pile, the advantages of environmental protection, high efficiency and material saving are achieved The construction structure retains the advantages of three traditional enlarged toe piles, reduces the environment influence by the mud discharge, solves the problem of lower efficiency in the drilling construction, improves the construction efficiency, reduces the mud replacement link, and saves the cement mortar The construction method of static-pressure plantation of the pile body of the slip-cast enlarged toe pile into the cement soil stirring pile achieves the effects of environmental protection, high efficiency and material saving, and is a novel construction structure of the pile body of the slip-cast enlarged toe pile with high efficiency, economy and reliability

Slip-cast enlarged toe pile and construction method thereof

The invention discloses a grouting device, an expanded-base prefabricated pipe pile, an expanded-base cast-in-place pile and construction methods of the expanded-base prefabricated pipe pile and the expanded-base cast-in-place pile and belongs to the field of civil engineering pile foundations. By arranging paste outlet holes and sealing layers on the grouting device, cement paste can be effectively prevented from entering the grouting device from a paste bag, the problem that a grouting pipe is blocked easily is effectively solved, and the grouting device is simple in structure and reliable in performance. Meanwhile, the provided improved expanded-base prefabricated pipe pile and the expanded-base concrete pipe pile can protect a grouting spray head very well, and a pile body can be put to a lower level easily. In addition, the invention further discloses the construction method of the expanded-base prefabricated pipe pile and the construction method of the expanded-base cast-in-place pile.

Grouting device, expanded-base prefabricated pipe pile, expanded-base cast-in-place pile and construction method of expanded-base cast-in-place pile

The utility model relates to a bag bottom expansion rigid and flexible combined pile. A combined pile body is formed by connecting prefabricated tubular pipes of a TSC pile, a PRC pile and a PHC pile from top to bottom. The bottom end of the PHC pile is provided with a pile bottom expansion head with an external wrapping bag. Grouting hole channels are reserved in the walls of all the prefabricated tubular piles, tubular pile connectors with holes are arranged at the two ends of each pile section, and a grout outlet is formed in the side wall of the bottom pile section. The outer side of the combined pile is wrapped by pile peripheral cement soil. According to the bag bottom expansion rigid and flexible combined pile, according to the rules of the pile body bearing horizontal loads in the soil body, the combined and connected prefabricated tubular piles with the bending resistance performance and the shear resistance performance increased gradually are sequentially implanted in the cement soil, the bag post grounding expansion head stable in character is arranged to increase the vertical bearing force of the pile body, and the bag bottom expansion rigid and flexible combined pile has high technical economic benefits.

Ye Zhehong

Papers

Bag bottom expanding rigid-flexible combined pile and construction method thereof

Bag bottom expansion rigid and flexible combined pile