Downhole sampling method and device used in standard penetration test

Inactive Publication Date: 2004-04-08
TSAI JIIN SONG
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  • Abstract
  • Description
  • Claims
  • Application Information

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This will seriously bias the engineer's judgment and lead to a faul

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  • Downhole sampling method and device used in standard penetration test
  • Downhole sampling method and device used in standard penetration test
  • Downhole sampling method and device used in standard penetration test

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Embodiment Construction

[0018] With reference to FIG. 1, a Standard Penetration Test (SPT) sampling device in accordance with the present invention comprises a closed housing (20), a split-barrel sampler (23), an anvil (24), a drop hammer (25) and a lifting device. The closed housing (20) has a top end and a bottom end. In practice, the top end of the housing (20) is a closed end, and the bottom end of the housing (20) is an open end. An inner thread is defined in the open end of the housing (20). A bottom cover (21) with threads is screwed into the inner thread in the bottom end of the closed housing (20) to close the bottom end of the closed housing (20). A support base (22) is formed in the bottom cover (21) and has a through hole (221) defined through the supporting base (22).

[0019] The split-barrel sampler (23) is mounted on the bottom end of the housing (20) and extends out from the through hole (221) in the bottom cover (21). The anvil (24) is attached to the top of the split barrel sampler (23). Th...

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Abstract

A sampling device has a closed housing, a split-barrel sampler, an anvil, a drop hammer and a lifting device. The split-barrel sampler is mounted in and extends out from the bottom end of the housing. The anvil is attached to the top of the split barrel sampler. The drop hammer is moveably mounted in the housing and is located above the anvil. The lifting device is mounted in the top end of the closed housing to lift the drop hammer to a specific height above the top of the anvil. With the sampling device, the impact energy generated by the hammer is directly transmitted to the sampler through the anvil. The impact energy lost is minimized, and the accuracy of the Standard Penetration Test result is improved.

Description

[0001] 1. Field of the Invention[0002] The present invention relates to an impact method and a sampling device, and more particularly to an impact method and a device used in Standard Penetration Test (SPT), which can enhance the impact energy by reducing the energy lost during testing.[0003] 2. Description of Related Art[0004] Construction engineers in the United States commonly use the Standard Penetration Test (SPT) as a routine prerequisite in subsurface investigations for foundation design. As a common practice, the foundation design is normally accomplished on the basis of the SPT results (the N-value). The American Society for Testing and Materials (ASTM) provides Standard Method (D1586-99) entitled, "Standard Test Method for Penetration Test and Split-Barrel Sampling of Soils" for performing the SPT. The ASTM Standard Method defines the SPT test for most engineering users.[0005] The Standard Penetration Test (SPT) consists of driving a split-barrel sampling "spoon" or sample...

Claims

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Application Information

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IPC IPC(8): E02D1/02E21B49/00G01N3/00G01N3/02G01N3/06G01N3/48G01N33/24
CPCE02D1/025E21B49/00G01N3/48G01N2203/0682G01N2203/0033G01N2203/0078G01N2203/0244G01N33/24
Inventor TSAI, JIIN-SONGJOU, LEE-DERLIOU, YEAN-JHELIU, FU-CHEN
Owner TSAI JIIN SONG
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