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Karst-area underwater bridge pier drilled pile construction method

A construction method and technology of bored piles, which are applied in the direction of filling, drill bits, sheet pile walls, etc., can solve the problems of disproportionate economic benefits, inestimable total amount of grouting, and large karst caves, so as to reduce labor costs and ensure karst caves The effect of treatment effect and low input cost

Active Publication Date: 2013-12-25
中铁建安工程设计院有限公司 +1
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Problems solved by technology

The static pressure chemical grouting method is also not applicable. Although the extra-large karst caves are filled with wet plastic and flow plastic fillings, the effect of this method is better, but because the karst caves are too large and the number is too large, the total amount of grouting cannot be estimated
In summary, although the above two construction methods of bored piles are simple, convenient, safe and easy to control, the economic benefits of input and output are not proportional

Method used

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  • Karst-area underwater bridge pier drilled pile construction method
  • Karst-area underwater bridge pier drilled pile construction method
  • Karst-area underwater bridge pier drilled pile construction method

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Embodiment Construction

[0041] Such as figure 1 A method for constructing bored piles for piers in water for bridges in karst areas is shown. The constructed bored piles pass through one or more karst caves from top to bottom. The method includes the following steps:

[0042] Step 1. Measurement and stakeout: measure and stake out the pile positions of the currently constructed bored piles.

[0043] During actual construction, the measurement and setting out must be accurate, and the pile position deviation must meet the requirements. Lay out the wires as required. Once the piles are formed, if the pile position deviates greatly, the stress on some piles will change. The total station is used for laying out, repeated inspections during the laying out process, and compound multi-point control. Then correct the deviation to avoid large deviations, resulting in delays in the construction period and waste of funds.

[0044] After the completion of the survey and setting out, due to the extremely compl...

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Abstract

The invention discloses a karst-area underwater bridge pier drilled pile construction method. The construction drilled pile passes through one or more karst caves from top to bottom according to the following steps that (1) measuring staking-out is conducted; (2) a steel protection barrel is put downwards and fixed; (3) drilling is carried out, namely, the steel protection barrel is put downwards and drilled from top to bottom through a percussion drill until the designed depth is reached, a slurry breast wall is adopted in the drilling process, when the drilled pile is drilled to enter the karst caves needing passing from top to bottom in the drilling process, an energy transfer method is firstly adopted to process the karst caves needing passing under the current state, then downward drilling is continuously carried out through the percussion drill; (4) a steel reinforcement cage is put downwards and concrete pouring is conducted. The karst-area underwater bridge pier drilled pile construction method is simple in step, reasonable in design, low in input cost, convenient to achieve, good in construction effect and capable of simply, conveniently and fast finishing the karst-area drilled pile construction process at a low cost in a high-quality mode.

Description

technical field [0001] The invention relates to a construction method of bored piles, in particular to a construction method of bored piles for bridge water piers in karst areas. Background technique [0002] At present, there are four construction methods for bored piles in karst areas: mud wall construction method, static pressure chemical grouting method, casing follow-up method and energy transfer method. Among them, the mud wall method is mainly suitable for small caves not larger than the pile diameter, and the specific conditions are determined according to the relative position of the cave, the type of surrounding rock and the nature of the filling. The grouting materials used in the static pressure chemical grouting method are ordinary Portland 425 cement, water glass, calcium chloride, sodium aluminate, etc. The casing follow-up method is suitable for karst caves with large groundwater flow, multi-layer karst caves, large karst caves and silt-sand karst. The stee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/40E02D17/18E21B31/107E21B10/36C04B28/26C04B14/10C04B14/02
Inventor 侯田海田杰郭富明任宵周吉学崔旭任少强
Owner 中铁建安工程设计院有限公司
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