Method for preventing hole collapse of drilling pile by automatic ejecting steel protection cylinder

Abstract

The invention discloses a method for preventing hole collapse of a drilling pile by automatic ejecting a steel protection cylinder. The method is characterized in that the steel protection cylinder which can be automatically ejected after being rolled is lowered into a to-be-supported position in the drilling pile, so that the steel protection cylinder is ejected, and the outer wall of the steel protection cylinder and the hole wall of the drilling pile are bonded and fixed to form a support. According to the method, a steel protection cylinder device capable of being automatically ejected anda steel protection cylinder lifting and placing device are used for construction, the steel protection cylinder device capable of being automatically ejected comprises the cylindrical steel protection cylinder formed by rolling a steel plate, the two ends of the steel plate are in lap joint to form handers, a steel bar is welded to the inner side face of the hander, located on the outer side, ofthe steel protection cylinder in the height direction of the steel protection cylinder to form a retraction clamping groove, a plurality of nuts are arranged at the handers position of the steel protection cylinder, the handers of the steel protection cylinder are connected through bolts inserted in the nuts, the top ends of the bolts are connected with connecting ropes, a plurality of steel bar heads are fixedly connected to the outer side surface of the steel protection cylinder, and the steel protection cylinder can be sleeved on the steel protection cylinder lifting device.

Description

technical field [0001] The invention relates to a method for preventing bored piles from collapsing, and belongs to the technical field of engineering construction. Background technique [0002] During the construction of engineering bored piles, if encountering unfavorable strata such as sand, pebble soil and other strata, it often causes different degrees of hole collapse. Some hole collapse problems can be prevented by increasing the specific gravity of the mud, increasing the water head height, reducing the drilling speed, and lengthening the casing. However, the effect is not obvious when the hole collapse is deep and the geology is particularly loose. After the hole is formed, the specific gravity of the mud is reduced through the hole cleaning process, the storage time is long, and the problem of hole collapse is still prone to occur when the steel cage is lowered to scratch the hole wall. [0003] In the construction of bored piles in loose ground, measures such as ...

AI Technical Summary

Problems solved by technology

Some hole collapse problems can be prevented by increasing the specific gravity of the mud, increasing the water head height, reducing the drilling speed, and lengthening the casing. However, the effect is not obvious when the hole collapse is deep and the geology is particularly loose. After the hole is formed, the specific gravity of the mud is reduced after the hole cleaning process, the storage time is long, and the problem of hole collapse is still prone to occur when the steel cage is lowered to scratch the hole wall

[0003] In the construction of bored piles in loose ground, measures such as increasing the proportion of mud, increasing the height of the water head, and reducing the drilling speed are often used to prevent hole collapse. This leads to a decrease in the hydraulic head pressure in the hole, and hole collapse is still easy to occur in loose formations.

In addition, after the hole is formed to the middle of concrete pouring, there are still processes such as clearing the hole, placing the steel cage and conduit, and waiting for the concrete, which generally takes a long time, and the hole collapse is also prone to occur during this period.

[0004] At present, hole collapse has always been a difficult problem in the construction of bored piles. The collapse of holes has a great impact on the quality of bored piles. Severe hole collapse will endanger the safety of personnel and equipment. The processing of hole collapse is time-consuming and laborious.

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