HAMMERING SYSTEM WITH ELECTROMAGNETIC POWER FOR DYNAMIC PILE TESTING

• US 20190316313A1
• Filed: 04/13/2018
• Published: 10/17/2019
• Est. Priority Date: 04/13/2018
• Status: Active Grant

• Current Assignee: Hohhot Sifang Engineering Quality Testing Center, Tianjin In-Situ Geophysical Scientific Co., Ltd.
• Original Assignee: Hohhot Sifang Engineering Quality Testing Center
• Inventors: WANG, Xiangping, GUO, Quansheng, JI, Xing, FU, Yonggang, HAN, Liang
• Granted Patent: US 10,941,538 B2
• Time in Patent Office: Days
• CPC Class Codes: E02D 33/00 Testing foundations or foundation structures testing methods and apparatus, see the relevant subclasses of class G01; testing structures or apparatus as regards function, in general, G01M; testing or determining chemical or physical properties, in general G01N
• CPC Class Codes: G01L 5/0052 measuring forces due to impact G01L5/0061, G01L5/14 take precedence; impact testing of structures G01M7/08; impact testing of material G01N3/00
• CPC Class Codes: G01M 7/08 Shock-testing
• CPC Class Codes: H02K 33/14 wherein the alternate energisation and de-energisation of the two coil systems are effected or controlled by movement of the armatures

Abstract

A new hammering system with electromagnetic power for dynamic pile testing. The basic working principle of the hammering system is as follows: when an internal coil is energized, a magnetic force is generated to attract tightly, via a magnetic conduction panel, an adaptive weight hammer disposed in contact with the surface of the panel; when the internal coil is de-energized, demagnetization occurs, and the weight hammer falls instantaneously to impact the pile top, thereby achieving the effects of a stable weight hammer and quick attraction and falling of the hammer. A clamping scale is arranged inside an adjustment section of a guide frame. A falling height of the weight hammer may be selected arbitrarily.

Claims

1. A hammering system with electromagnetic power for dynamic pile testing, comprising:

an electromagnetic detacher, wherein when an internal coil of the electromagnetic detacher is energized, a magnetic force is generated to attract tightly, via a magnetic conduction panel, an adaptive weight hammer disposed in contact with the surface of the panel;

when the internal coil is de-energized, demagnetization occurs, and the weight hammer falls instantaneously to impact a pile top as the magnetic force disappears;

when the internal coil is energized again, a magnetic force is generated to attract the weight hammer again for performing next hammering;

the electromagnetic detacher is a box-like component, which comprises a bottom shell, an iron core, a coil, a panel, a cable connection box, a current rectification control cabinet, a cable drum and a wireless remote controller, and is powered by a direct current;

the hammering system comprises a cylindrical box in which a coil of a corresponding number of turns is wound according to an attraction force requirement; and

wherein, in dynamic pile testing, the electromagnetic detacher is placed on the top surface of the weight hammer by using a crane, and energized to attract the weight hammer and lift it to a desired height;

then, the electromagnetic detacher is de-energized, and demagnetization occurs to release the weight hammer;

since the de-energization and the hammer falling are completed instantaneously, the weight hammer falls freely to the pile top without any external force.

2. The hammering system with electromagnetic power for dynamic pile testing according to claim 1, wherein a retractable guide frame is of a special steel structure comprising a base section and an adjustment section;

the base section has trapezoidal side surfaces and square top and bottom surfaces;

a side length of the bottom surface of the base section is 4 m;

the adjustment section has rectangular side surfaces and square top and bottom surfaces; and

the adjustment section is sleeved with the base section.

3. The hammering system with electromagnetic power for dynamic pile testing according to claim 1, wherein a special hammer cushion is of a sheet structure comprising a steel plate, rubber, and an air bag, and has a specification the same as that of the bottom surface of the weight hammer.

4. The hammering system with electromagnetic power for dynamic pile testing according to claim 1, wherein the hammering system generates a magnetic force or undergoes demagnetization through energization or de-energization, thereby achieving the effects of a stable weight hammer and quick attraction and falling of the hammer.