Deep hole underwater installation and locating method of steel pipe column in weak watery stratum

Abstract

The invention discloses a deep hole underwater installation and locating method of a steel pipe column in a weak watery stratum, concretely comprising the following construction steps of firstly, pouring concrete with a design height in the steel pipe column, and installing and locating a screw jack at the bottom of the steel pipe column; secondly, measuring and paying off on the construction ground surface, and drilling by a drill; thirdly, installing a drilling pile reinforcement cage in a hole; fourthly, installing a location platform on the construction ground surface; fifthly, hoisting the steel pipe column and putting the steel pipe column in a drilling pile hole; sixthly, locating the top part of the steel pipe column by the ground surface location platform; seventhly, locating and measuring the verticality of the steel pipe column by a laser plummet; eighthly, locating the bottom of the steel pipe column by the screw jack; ninthly, pouring drilling pile concrete underwater to the design burying height of the steel pipe column; and tenthly, pouring steel pipe column internal concrete to the top of a steel tube after the drilling pile internal concrete achieves the design strength of 70 percent. The method has the advantages of simple operation, high construction efficiency, low construction cost, high and controllable installation accuracy and little safety risk.

Description

【Technical field】 [0001] The invention relates to an installation method of a vertical load-bearing system in a cover-excavation construction structure, in particular to an installation and positioning method of a steel pipe column in a deep-hole underwater in a cover-excavation reverse construction structure. 【Background technique】 [0002] With the rapid development of China's economy and the acceleration of urbanization, urban construction has entered a period of great development, and the enthusiasm for construction in various places is increasing day by day. However, increasingly prosperous cities create less and less conditions for construction and leave less and less time for construction. Construction is difficult. getting bigger. The above phenomena are mainly reflected in: large project scale, many foundation pit groups, large foundation pit area and deep depth. It is known that the cover-excavation method is to build the enclosure structure and intermediate piles...

AI Technical Summary

Problems solved by technology

[0003] In water-rich and weak formations, the ordinary steel casing retaining wall method is generally used in China to install and position steel pipe columns in deep holes drained of mud, which specifically includes the following steps: steel casing retaining wall, pumping and draining mud, and artificial hole bottom installation and positioning However, this construction method has complicated procedures, long construction period, high construction cost, high safety risk after pumping out the mud, and bored piles. The construction joints formed by pouring concrete multiple times in the interior have relatively large adverse effects on the anti-removal force of the pile, and the accuracy is not easy to measure. The specific performance is as follows:

[0004] (1) Using steel casing to protect the wall, due to the deep burial of the steel pipe column, the recovery rate of the steel casing is low, and the construction cost is high;

[0005] (2) Before manually installing the locator, the mud needs to be pumped out, and the pressure on the hole wall is relatively high. When the strength of the steel casing is lower than the pressure on the hole wall, it is easy to cause the hole wall to collapse, and there is a greater safety risk;

[0006] (3) Bored piles are generally combined with anti-removal piles, and the bottom of the steel pipe column needs to be anchored into the bored piles. The construction joints formed by pouring concrete multiple times have a relatively large adverse effect on the anti-removal force of the bored piles;

[0007] (4) Concrete needs to be poured multiple times, with complicated procedures and long construction period;

[0008] (5) After positioning and installation, the process of pouring concrete is not easy to control;

[0009] (6) When the steel pipe column is installed, the contact degree between the locator and the steel pipe column directly affects the verticality of the steel pipe column, but the contact degree is not easy to detect

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