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Drilling pretreatment method for cast-in-place pile on block-stone-containing silty soil foundation

A technology of sand foundation and cast-in-situ piles, which is applied to drilling equipment and methods, earthwork drilling, sheet pile walls, etc., can solve the problems of increasing construction period and construction cost, difficulty in ensuring project quality, prolonging working hours, etc., and achieve improvement The effect of project quality and progress, reducing hole collapse, and speeding up the construction process

Inactive Publication Date: 2018-02-16
ZHEJIANG JIANGNANCHUN CONSTR GRP
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  • Application Information

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Problems solved by technology

The previous solution was often to extend the working hours and increase the project investment under the condition of the existing equipment, which not only increased the construction period and construction cost, but also made it difficult to guarantee the project quality

Method used

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  • Drilling pretreatment method for cast-in-place pile on block-stone-containing silty soil foundation
  • Drilling pretreatment method for cast-in-place pile on block-stone-containing silty soil foundation
  • Drilling pretreatment method for cast-in-place pile on block-stone-containing silty soil foundation

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Embodiment Construction

[0035] Such as Figure 1 to Figure 5 Shown, the present invention is the method for pretreatment of borehole drilling of foundation grouting piles containing block stone silt sand, comprising the following steps:

[0036] (1) Soil survey:

[0037] After measuring and setting out, draw the floor plan of the construction site and arrange the drilling positions; collect 100g soil samples at each drilling position, put them in sealed bags after drying, and investigate the soil quality of each soil sample to detect its composition, strength and hardness and other parameters, record the survey data, and determine the structural parameters of the steel casing 1 according to the survey data;

[0038] The soil survey process is used to detect the soil conditions at the drilling location, so that workers can understand the soil structure and properties, so that workers can be equipped with corresponding equipment, tools and other construction preparations according to the soil characte...

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Abstract

The invention discloses a drilling pretreatment method for a cast-in-place pile on a block-stone-containing silty soil foundation. Through the vibration principle of a vibration hammer, the vibrationhammer generates high-speed vibration together with a steel casing to enable soil around the pile wall to generate the liquefaction effect, and accordingly the friction resistance of the pile wall isreduced; through vibration force and the weight of a hammer body and the steel casing, the steel casing can penetrates through a soil layer to the designed position, so that the steel casing is driveninto the bottom of an underground block stone layer; block stone and soil masses in the steel casing are grabbed out through the impact and grabbing effects of an impact-grabbing drill; and the steelcasing is backfilled with earthwork and pulled out, and finally an abrasion drill can continue to be used to conduct normal construction of the drilled cast-in-place pile. According to the drilling pretreatment method, obstruction of the block stone to drilling construction is eliminated, construction difficulty is lowered, the construction time is shortened, the construction cost is reduced, andthe construction quality can be guaranteed.

Description

technical field [0001] The invention relates to a drilling pretreatment method, in particular to a method for drilling pretreatment of cast-in-place piles in silty soil foundations containing block stones. Background technique [0002] Water conservancy and hydropower projects, sluice pump stations and other structural buildings are generally constructed at river embankments, and most of them use bored piles for foundation treatment. Under the ground, it is inevitable to encounter block stone layers that were used for anti-scouring reinforcement many years ago. After the burial depth of the block stone layer is relatively large (even up to 12 meters), problems such as difficulty in drilling and hole collapse will inevitably occur. The previous solution was often to extend the working hours and increase the project investment under the condition of the existing equipment, which not only increased the construction period and construction cost, but also made it difficult to gua...

Claims

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Application Information

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IPC IPC(8): E21B7/20E02D5/38E02D5/60
CPCE21B7/20E02D5/38E02D5/60
Inventor 宋翔覃南杨志军王夏勋狄建刚龚曙光
Owner ZHEJIANG JIANGNANCHUN CONSTR GRP
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