Pile body longitudinal multipoint grouting device

Abstract

The invention belongs to grouting devices behind cast-in-place concrete piles, and discloses a pile body longitudinal multipoint grouting device. The device can be widely applied to pile foundations adopted by building pressure bearing or extraction resisting. The device is provided with a grouting guide pipe extending from the ground to a pile end, guide pipe side wall grouting holes and a controllable grouting core pipe which can move vertically and be inserted into the guide pipe. According to the device, grouting is achieved on pile side grouting devices with different elevations at the pile end and the guide pipe, pile body grouting is more uniform, the effect is more reliable, and building quality can be guaranteed conveniently.

Description

technical field [0001] The invention belongs to the post-grouting device for on-site concrete pouring piles in the field of building engineering, and can be widely used in pile foundations used for pressure bearing or pullout resistance of buildings. Background technique [0002] Since the 1980s, bored piles have been widely used in high-rise buildings and municipal construction. Mud wall protection technology is widely used in the pile-forming process of bored piles. This process often forms pile body mud skin and pile tip sediment, which reduces end resistance and side resistance, making the bearing capacity of bored piles lower than that of prefabricated piles under the same conditions. , and the dispersion of bearing capacity is very large. Especially for uplift piles, since the bearing capacity is mainly provided by pile side friction, the weakening of side resistance will greatly reduce the bearing capacity. The post grouting at the pile end and pile side is through ...

AI Technical Summary

Problems solved by technology

At present, the pile end grouting and pile side grouting devices need to be installed separately, and the pile side grouting mainly adopts the method of setting vertical conduits and circumferential grouting flower tubes along the steel cage, and realizes through multiple annular grouting sections at different elevations. For the grouting of the entire pile body, when the pile length is long, more circumferential grouting sections need to be set along the pile length, and each section needs to be equipped with a vertical conduit and a circumferential grouting pipe. and more difficult work

In addition, the distance between each grouting section is generally about 9m, resulting in poor controllability of grouting quality far away from the ring pipe

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