Method for making pile foundation construction follow long steel pile casing construction in karst area

A steel casing and regional technology, which can be used in infrastructure engineering, sheet pile walls, buildings, etc., can solve the problems of severe rock distortion and extrusion, complex distribution, etc., and achieve the effect of shortening the construction process and saving construction costs.

Active Publication Date: 2011-12-21
THE FIRST ENG CO LTD OF CTCE GRP
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Problems solved by technology

However, according to a large number of survey holes, various types of underground rocks are severely twist...

Method used

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Embodiment Construction

[0019] The construction process of the pile foundation of the Sanjiang Town Extra Large Bridge is as follows:

[0020] 1. Use a drill bit with a diameter of 2.0m to impact to a depth of 25m. During the drilling process, pay attention to the specific gravity of the mud not less than 1.2kg / l. (keep the holes from collapsing)

[0021] 2. During the drilling process, the support foundation is treated, and C20 concrete strip foundations are set at the four corners of the support. The foundation is 1.5m long, 1m wide and 0.5m thick, and the top surface is flush with the drilling rig platform. A layer of reinforced mesh with a vertical and horizontal spacing of 15cm and a diameter of 10mm is provided at the bottom of the foundation. After testing, the bearing capacity of the platform foundation is 90kpa, and the bearing capacity of the four foundations is 4×1.5×1×90=540KN, which meets the requirements.

[0022] 3. After the drilling reaches a depth of 25m, remove the drilling rig,...

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Abstract

The invention discloses a method for making pile foundation construction follow long steel pile casing construction in a karst area. The method comprises the following steps of: drawing a pattern of a steel pipe bracket for supporting a steel pile casing by using graphics software; welding section steel and a steel pipe according to drawing paper to form a bracket for supporting the steel pile casing; during field application, treating a bracket foundation; putting the bracket at an orifice; making the steel pile casing follow segmentally by using a chain fall; and in the falling process of the steel pile casing, checking whether the verticality and the like are consistent with the specification and design requirements. The method has the characteristics of rapidness and safety when applied to pile foundation construction in the karst area; and moreover, the steel pipe bracket used during construction can be used repeatedly, the construction process is shortened, and the construction cost is saved.

Description

[0001] technical field [0002] The invention relates to a method for following up the construction of long steel casings in pile foundation construction in karst areas. Background technique [0003] Sanjiang Town Super Bridge is located in the alluvial plain of Jiangxi and Fuzhou, where the sandy soil layer is relatively thick (20-35m). It is difficult to see structural signs on the surface after the rock strata are denuded and flattened. However, according to a large number of survey holes, all kinds of underground rocks are severely twisted and squeezed by the structure, and the distribution is extremely complicated, without any regularity to follow. The soft and hard rocks are interbedded and staggered, overlapped and interspersed, weathered unevenly, soft with hard, hard with soft. The rock formations are cut into blocks, squeezed and shifted each other, and some rock masses have the characteristics of crushing. In order to ensure construction safety and construction...

Claims

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Application Information

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IPC IPC(8): E02D7/00E02D27/32
Inventor 熊兴业阳雪夏天夏志刚
Owner THE FIRST ENG CO LTD OF CTCE GRP
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