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A construction method of ultra-deep buried test piles in rock formations

A construction method and technology of test piles, which can be applied in foundation structure tests, sheet pile walls, earthwork drilling and mining, etc., can solve the problem of limited static load detection operating conditions at the bottom of ultra-deep foundation pits and inaccurate elevation of underwater concrete overfilling Controlling, difficulty in forming holes in complex rock formations, etc., to achieve the effect of solving large-tonnage static load tests, ensuring the elevation of pile bottoms, and ensuring accuracy

Active Publication Date: 2021-08-17
CHINA CONSTR EIGHTH ENG DIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical task of the present invention is to provide a construction method for ultra-deep buried test piles in rock formations to solve the difficulties in forming holes in complex rock formations often encountered by cast-in-situ piles, the inability to accurately control the super-filling elevation of underwater concrete, and the static load at the bottom of ultra-deep foundation pits. The detection operation conditions are limited, and the control of frictional resistance affects the bearing detection problem

Method used

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  • A construction method of ultra-deep buried test piles in rock formations
  • A construction method of ultra-deep buried test piles in rock formations
  • A construction method of ultra-deep buried test piles in rock formations

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Embodiment

[0097] attached figure 1 As shown in the figure, the construction method of the ultra-buried depth test pile in the rock layer of the present invention is a construction method of the ultra-buried depth test pile in the rock layer. The concrete outer formwork isolates the friction resistance of part of the pile body of the empty pile, and realizes the accurate detection of the bearing capacity of the effective pile body before the excavation of the deep foundation pit; and then uses the BIM technology to form a rock layer information model from the soil layer parameters obtained by multiple advanced drilling. Determine the length of the pile; then use the monitoring probe to automatically collect the technical parameters in the process of underwater concrete pouring and process the data, dynamically monitor the height of the poured concrete, and use the preset limit to realize the brake alarm prompt and direct the pouring operation; as follows:

[0098] S1. Construction prepa...

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Abstract

The invention discloses a construction method for super-buried test piles in rock strata, which belongs to the field of test pile construction. The technical problems to be solved by the invention are that it is difficult to form holes in complex rock strata often encountered by cast-in-situ piles, and the super-filling elevation of underwater concrete cannot be accurate. Controlling, operating conditions of ultra-deep foundation pit bottom static load detection are limited, and controlling frictional resistance affects load-bearing detection. The technical solution is as follows: S1, construction preparation; S2, advance drilling exploration, and establish a BIM model of the rock surface; S3, positioning And bury the casing, and make and place the double sleeve of the test pile; S4, the drilling rig is in place, the drill pipe is centered and the verticality is adjusted; S5, the soil layer drilling, the retaining wall and the multi-level stepped drilling of the rock layer; S6 1. Use the internal and external double control method to monitor the verticality of the drill pipe; S7. According to step 2, carry out the production of the steel cage and the installation of the anti-floating structure, and hang the steel cage and install the superfill monitoring probe; S8. Secondary hole cleaning by circulation method; S9, monitoring of underwater concrete pouring and overfilling height.

Description

technical field [0001] The invention relates to the field of construction of test piles before excavation of building foundations, in particular to a construction method of super-buried depth test piles in rock layers. Background technique [0002] The test pile is a test device used before construction. Its purpose is to detect whether the bearing capacity and settlement of the pile foundation are consistent with the design, so as to ensure the construction quality. The test piles are generally carried out before the excavation of the building foundation pit or before the excavation to the bottom level of the groove. [0003] With the continuous increase of large-scale super high-rise and underground space construction projects, the foundation depth is also increasing, and the number of similar projects is increasing. Subsequently, the buried depth of the pile top is also increasing, and engineering piles with a buried depth of up to 25m have become relatively common. For...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D5/34E02D13/04E02D13/08E02D5/66E02D33/00E21B11/00G06F30/13
CPCE02D5/34E02D5/66E02D13/04E02D13/08E02D33/00E21B11/00G06F30/13
Inventor 王伟董福永张串王安平葛群汪兆斌
Owner CHINA CONSTR EIGHTH ENG DIV
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