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Embedded pipe for sampling pile tip of filling pile

A technology of pre-embedded pipes and cast-in-place piles, which is applied in the test of foundation structure, construction, foundation structure engineering, etc., can solve the problems of inability to understand the concrete and bearing layer of the pile body at the end of the pile, and inability to penetrate the length of the pile.

Inactive Publication Date: 2013-02-13
EAST CHINA ARCHITECTURAL DESIGN & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the pile length is long, the core taken from the top of the pile often cannot penetrate the entire pile length, and it is impossible to understand the situation of the pile concrete and the bearing layer at the pile end

Method used

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  • Embedded pipe for sampling pile tip of filling pile
  • Embedded pipe for sampling pile tip of filling pile
  • Embedded pipe for sampling pile tip of filling pile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] Such as figure 1 and figure 2 As shown, the pre-embedded pipe 1 is a steel pipe coaxially attached to the inner side of the reinforcement cage 2 of the cast-in-situ pile 3. The inner diameter of the steel pipe is not less than the diameter of the drill bit of the core sampling machine, and the inner diameter of the steel pipe is usually greater than 1100mm. The elevation of the top of the pre-embedded pipe 1 is the same as that of the top of the cast-in-situ pile 3, and the elevation of the bottom of the pipe is 3-5m higher than the end elevation of the cast-in-place pile 3.

[0016] Such as image 3 As shown, the two ends of the pre-embedded pipe 1 are sealed to form a plugging head 4 to prevent concrete from entering the pipe. The end of the pre-embedded pipe 1 is sealed with wood-bonded sealant or other existing sealing methods. Blocking measures can effectively prevent concrete or grout from entering the pipe without affecting the drilling of subsequent sampling ...

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Abstract

The invention discloses an embedded pipe for sampling a pile tip of a filling pile, which belongs to the field of in-situ concrete filling piles for fixing building foundations. Coaxial sleeves of the embedded pipe are pasted on the inner side of a steel reinforcement cage of the filling pile; the internal diameter of the embedded pipe is no less than the diameter of a drill bit of a core drilling and sampling machine; a top elevation of the embedded pipe is the same as that of the steel reinforcement cage; a bottom elevation of the embedded pipe is higher than the end elevation of the filling pile; and the two ends of the embedded pipe are blocked off. According to the embedded pipe, core drilling equipment can conveniently penetrate through a pile body through the embedded pipe to directly drill and obtain a pile tip core sample and a bearing course rock soil core sample; the concrete quality at the pile tip, the sediment condition and the supporting course condition can be evaluated; and detection modes and data are enriched, so that the building quality can be better ensured.

Description

technical field [0001] The invention belongs to the field of on-site concrete pouring piles for fixing building foundations. Background technique [0002] A considerable part of pile foundation engineering accidents is caused by serious quality problems of the pile body. After the pile foundation construction is completed, it is very important to select engineering piles reasonably for integrity testing and evaluate the quality of engineering piles. Commonly used pile foundation integrity detection methods include drilling core-pulling method, acoustic transmission method, high-strain dynamic detection method, low-strain dynamic detection method, etc. Among them, the low-strain method is convenient and flexible, and the detection speed is fast, which is suitable for the detection of prefabricated piles and small-diameter cast-in-place piles. However, for large-diameter piles with a diameter greater than 800mm, especially rock-socketed piles, the bearing capacity is general...

Claims

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Application Information

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IPC IPC(8): E02D33/00
Inventor 王卫东吴江斌
Owner EAST CHINA ARCHITECTURAL DESIGN & RES INST
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