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High-development karst area superfine hole pile construction method

A construction method and karst technology, applied in the direction of sheet pile wall, foundation structure engineering, foundation structure test, etc., can solve the problems of construction period, uncontrollable cost, uncontrollable backfill quantity, occurrence of engineering accidents, etc., and achieve convenient and fast quality , The effect of small environmental factors and tight construction schedule

Inactive Publication Date: 2019-07-26
CHINA RAILWAY ERJU 1ST ENG
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AI Technical Summary

Problems solved by technology

[0002] Karst geology is widely distributed in our country. During the construction of bored piles, due to failure to take effective measures to cause hole collapse, engineering accidents occurred, which greatly increased the cost of the project, seriously delayed the construction period, and even forced to suspend the construction.
Karst geology bored piles are generally constructed by the punching method. In the punching project, measures such as backfilling with rubble and concrete are used. The construction progress is slow, and because the amount of backfilling is uncontrollable, the construction period and cost are uncontrollable.

Method used

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  • High-development karst area superfine hole pile construction method
  • High-development karst area superfine hole pile construction method

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Embodiment

[0030] refer to figure 1 , this embodiment provides a construction method for ultra-fine hole piles in strongly developed karst areas.

[0031] 1. Preparation

[0032] 1. Before construction, the design drawings should be carefully reviewed and the site surveyed, and the construction sequence should be planned in advance according to the layout of the pile foundation.

[0033] 2. In order to ensure the bearing capacity of the engineering piles under the station floor, advanced drilling (one hole for one pile) shall be carried out for the engineering piles under the floor; the drilling depth of the advanced drilling shall not be less than 5 times the design diameter of the pile body below the pile bottom elevation; When karst caves are encountered within the design diameter range of 5 times the design pile body at an elevation, continue to drill down to keep the pile body located in the weathered rock stratum within 5 times the design diameter of the pile body.

[0034] 3. Af...

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Abstract

The invention provides a high-development karst area superfine hole pile construction method, and belongs to the field of building engineering construction. By comprehensively considering the factorssuch as hydrogeological conditions, the construction period and existing machinery equipment, karst processing drilling cast-in-place piles are constructed by adopting a 360-degree rotation full sleeve, and a matched construction technology is formed. The high-development karst area superfine hole pile construction method is concluded and formed through successful application of the project to solve the problems that the engineering cost is greatly increased, the construction period is seriously delayed and even the construction is forced to be interrupted due to the engineering accident occurrence caused by hole collapse due to that fact that effective measures do not be adopted in the current drilling cast-in-place pile construction process. According to punching method construction adopted under the general conditions by the karst hydrogeological drilling cast-in-place piles, rubble and concrete backfilling and other measures are carried out in the punching process, the constructionprogress is slow, and as the number of backfill is uncontrollable, the construction period and the cost are uncontrollable.

Description

technical field [0001] The invention relates to a construction method for ultra-fine hole piles in strongly developed karst areas, belonging to the field of construction engineering. Background technique [0002] Karst geology is widely distributed in my country. During the construction of bored piles, failure to take effective measures leads to hole collapse, which leads to engineering accidents, which greatly increases the cost of the project, seriously delays the construction period, and even has to stop the construction. Karst geology bored piles are generally constructed by the punching method. In the punching project, measures such as backfilling with rubble, concrete, etc., the construction progress is slow, and because the amount of backfilling is uncontrollable, the construction period and cost are uncontrollable. Contents of the invention [0003] China Railway Second Bureau No. 1 Engineering Co., Ltd. comprehensively considered factors such as hydrogeological co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/38E02D15/04E02D33/00
CPCE02D5/38E02D15/04E02D33/00
Inventor 陶虹石伟苟罗波陈长水龙顺何宇航
Owner CHINA RAILWAY ERJU 1ST ENG
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