Compound jet grouting pile machine, compound jet grouting pipe and construction method for compound jet grouting pile

Abstract

The invention discloses a compound jet grouting pipe machine which comprises a support (5), an outer sleeve (4), an inner core rod (3), a connecting device (2), a high-pressure pipeline (1) and a drill bit (14), wherein the high-pressure pipeline (1) is tightly connected with the inner core rod (3) through the connecting device (2); the inner core rod (3) is coaxially sleeved with the outer sleeve (4); the outer sleeve (4) is fixedly connected to the support (5); and the drill bit (14) is connected with the bottom end of the inner core rod (3), and comprises stirring drilling blades and a high-pressure nozzle (15) detachably mounted into a cylinder defined by the side wall of the drill bit (14). The invention further discloses a construction method for a compound jet grouting pile, and the compound jet grouting pile. According to the compound jet grouting pile machine, the pile is formed at a time, the stability is high, and the machine is suitable for soft and hard soil bodies, high in automation degree and capable of saving materials.

Description

technical field [0001] The invention relates to the field of civil engineering, more specifically, to a composite rotary grouting pile machine, a composite rotary grouting pile and a construction method thereof. Background technique [0002] At present, in the foundation treatment engineering in the field of construction engineering, the cement reinforcement method is widely used as a treatment method, and many methods, processes and equipment have evolved and derived. Among them, cement mixing pile is a conventional construction method, but this method has high requirements on soil quality, and it is easy to cause difference in pile body strength due to uneven mixing, thereby affecting the bearing capacity. [0003] In order to solve the above defects of cement mixing piles, high-pressure jet grouting piles came into being. During the construction of pile foundations in construction projects, for clay layers, filling layers, silt layers, and sand layers, the most commonly u...

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Problems solved by technology

[0007] In view of the above defects or improvement needs of the prior art, the present invention provides a composite rotary grouting pile machine, a composite rotary grouting pile and its construction method, which improves the drill pipe of the traditional high-pressure rotary pile machine, and the drill The rod is divided into inner and outer layers, the outer layer is the outer casing, and the inner layer is the inner core rod, and the length of the drill rod can be determined according to actual needs. On the one hand, the pressure of the cement slurry can be increased through the height of the drill rod itself. On the other hand, The double-layer drill pipe can withstand greater cement slurry pressure and pile to the bottom at one time, which effectively avoids the problem of poor construction stability caused by human interference in the hole-forming process of small bolters

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