Method for strengthening and repairing pile head of hollow square pile

Abstract

The invention relates to a method for strengthening and repairing the pile head of a hollow square pile, specifically comprising the following steps of: removing damaged and loosened concrete of the pile head, cutting to expose the main reinforcement by 3-4 cm and aligning the main reinforcement vertically; next, removing floating dust and mud from the concrete-removed surface through water washing, performing natural drying and nesting a pile cap of the same specification to the pile head and then connecting the exposed main reinforcement with the pile cap; furthermore, putting a tray matched with the pile cap in the cavity of the square pile and connecting the tray with the pile cap; and finally, fully filling epoxy resin concrete into the cavity formed by the tray, a square end plate and the inner wall of the square pile, and continuing connection of pile sinking after the epoxy resin concrete is solidified for 2 hours.

Description

technical field [0001] The invention belongs to the field of construction, and in particular relates to a method for reinforcing and repairing a hollow square pile head, which can continue sinking piles within 2 hours after repairing and improves work efficiency. Background technique [0002] With the increasing importance of modern buildings and the continuous increase in building height. Higher requirements are put forward for the bearing capacity of the foundation. The natural foundation can no longer bear the load of the superstructure better, so an artificial foundation is used, and there is a prefabricated pile foundation in which the prefabricated piles are pressed into the foundation by a pile driver. After being underground, it becomes a deep foundation pile, allowing the foundation pile to carry the upper load and guide it to a stable ground. my country has corresponding national and local standards for the design, production and use of such piles. For example, "...

AI Technical Summary

Problems solved by technology

However, in the actual construction process, due to some unfavorable factors, there are often phenomena such as smashing the pile head, local concrete falling off the outside of the pile, and the end plate of the pile head being knocked off (sometimes accompanied by longitudinal cracks on the inner and outer walls), which make it impossible to continue sinking the pile and affect the quality of the pile. Project construction progress and cycle

If a rotten pile appears, if it cannot be repaired in time, the pile position must be added again, and some even need to add 2-3 pile positions to replace the rotten pile position, resulting in great engineering loss and waste, such as the pile position pile The length is 38m, if two sets are added and this pile position is added, it will be 3 sets

The total length of the pile is 114m, and the corresponding cost has increased a lot. At this time, the pile head is used to reinforce and repair and continue to sink the pile, which has saved a lot of unnecessary economic losses for all aspects of the project, and the construction progress has also been accelerated.

There are two kinds of materials used for repairing piles: one is sulfur cement concrete, and the other is epoxy resin concrete. These two have their own advantages. For example, if sulfur cement is used, after the repair is completed, it needs to wait for 12 hours to solidify before sinking the pile. Although the cost Low, but delaying the pile sinking time makes it extremely difficult to sink the pile later

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