# US 2006/0213279 A1 · Apparatus and method for measuring supporting force of large diameter ferroconcrete piles > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2006/0213279 A1 - Document ID: US20060213279A1 - Status: Published application - Kind: A1 - Application number: 11/373,328 - Filed: 2006-03-13 - Published: 2006-09-28 - Earliest claimed: 2005-03-25 - Assignees: G-Tech; Yong-Kyu Choi; Min-Hee Lee - Inventors: Yong-Kyu Choi; Min-Hee Lee - Web page: https://patentgrep.com/patent/US20060213279A1 ## CPC - 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) - E02D: FOUNDATIONS; EXCAVATIONS; EMBANKMENTS (specially adapted for hydraulic engineering E02B); UNDERGROUND OR UNDERWATER STRUCTURES {(tunnels, tunnelling, mining E21)} ## Abstract An apparatus measures a supporting force of ferroconcrete piles by means of a bi-directional front end oil pressure loading apparatus using a high pressure loading system capable of measuring a supporting force, a sinking amount and an axis load distribution on the ferroconcrete piles. The apparatus comprises: a steel plate having a predetermined thickness and diameter and including upper and lower discs having penetration holes through which concrete passes; a fixing member for separating the discs from each other by a predetermined distance; a high oil pressure cylinder for producing an oil pressure force; an oil cylinder inflation displacement measuring sensor for measuring a displacement; an upper displacement measuring rod coupled to the upper disc for measuring a displacement of the upper disc; a lower displacement measuring rod coupled to the upper disc for measuring a displacement of the lower disc; an axis load transition measuring instrument including a tremie induction tube coupled to the upper disc for guiding concrete to the penetration holes; iron elements coupled to the upper disc; a load sensor for measuring ground abrasion; and a sensor line for transferring a signal and current to the load sensor. A corresponding method is disclosed. ## Claims ### Claim 1 An apparatus for measuring a supporting force of ferroconcrete piles installed at a scene by means of a bi-directional front end oil pressure loading apparatus using a high pressure loading system, comprising: a loading apparatus including a steel plate having a predetermined thickness and diameter, upper and lower discs having penetration holes formed therein for passing a fixing member for separating the upper and lower discs by a predetermined distance, an oil pressure cylinder for producing an oil pressure force, and a sensor installed adjacent to the oil pressure cylinder for measuring a displacement; a displacement measuring arrangement including an upper displacement measuring rod coupled to the upper disc for measuring a displacement of the upper disc, and a lower displacement measuring rod coupled to the upper disc for measuring a displacement of the lower disc; and a load transition measuring instrument including a tremie induction tube coupled to the upper disc for guiding concrete to the penetration holes, iron elements coupled to the upper disc, an axis load sensor coupled to the iron elements for measuring ground abrasion, a sensor line for transferring at least one of a signal and a current to the axis load sensor, and a measuring system for storing and displaying measured data from the axis load sensor. ### Claim 2 (depends on 1) The apparatus of claim 1, wherein said displacement measuring arrangement includes an upper displacement measuring rod casing containing the upper displacement measuring rod and a lower displacement measuring rod casing containing the lower displacement measuring rod. ### Claim 3 (depends on 1) The apparatus of claim 1, wherein said upper and lower displacement measuring rods are connected perpendicularly to the upper and lower discs, respectively. ### Claim 4 (depends on 1) The apparatus of claim 1, wherein said load transition measuring instrument includes a sister bar coupled to the iron elements, said sensor line transferring said at least one of the signal and the current to the sister bar. ### Claim 5 (depends on 4) The apparatus of claim 4, wherein said measuring system stores and displays measured data from the sister bar. ### Claim 6 (depends on 1) The apparatus of claim 1, wherein said load transition measuring instrument includes an extension line connected to said sensor line and having a predetermined length for preventing a disconnection. ### Claim 7 An apparatus for measuring a supporting force of ferroconcrete piles installed at a scene by means of a bi-directional front end oil pressure loading apparatus using a high pressure loading system, comprising: an upper disc having a predetermined thickness and diameter; a lower disc positioned below the upper disc; a high-pressure jack positioned between the upper disc and the lower disc; upper and lower displacement measuring rods coupled to the ferroconcrete piles and separated from the upper disc by a predetermined distance; an oil pressure jack displacement instrument coupled to a side of the high-pressure jack; an oil pump for supplying oil pressure to the high-pressure jack; and an oil pressure hose and a load and pressure adjuster for conveying the oil pressure supplied by the oil pump to the high-pressure jack. ### Claim 8 (depends on 7) The apparatus of claim 7, wherein said high pressure jack comprises a double-action high pressure jack. ### Claim 9 (depends on 7) The apparatus of claim 7, further comprising a load and pressure adjuster operatively associated with the oil pressure hose for conveying the oil pressure supplied by the oil pump to the high pressure jack. ### Claim 10 An apparatus for measuring a supporting force of ferroconcrete piles installed at a scene by means of a bi-directional front end oil pressure loading apparatus using a high pressure loading system, comprising: an upper disc having a predetermined thickness and diameter; a lower disc positioned below the upper disc; an oil pressure jack positioned between the upper disc and the lower disc; upper and lower displacement measuring rods coupled to the ferroconcrete piles and separated from the upper disc by a predetermined distance; an oil pressure jack displacement instrument coupled to a side of the oil pressure jack; an oil pump for supplying oil pressure to the oil pressure jack; and an oil pressure hose for conveying the oil pressure supplied by the oil pump to the oil pressure jack. ### Claim 11 (depends on 10) The apparatus of claim 10, wherein said oil pressure jack comprises a spring restoration type single-action oil pressure jack. ### Claim 12 (depends on 10) The apparatus of claim 10, further comprising a load and pressure adjuster operatively associated with the oil pressure hose for conveying the oil pressure supplied by the oil pump to the oil pressure jack. ### Claim 13 An apparatus for measuring a supporting force of ferroconcrete piles installed at a scene by means of a bi-directional front end oil pressure loading apparatus using a high pressure loading system, comprising: upper and lower displacement measuring rod casings; an induction cover having a penetration hole formed therein, said induction cover being insertable into said upper and lower displacement measuring rod casings; upper and lower displacement measuring rods having a predetermined length and insertable into the penetration hole of the induction cover; a connection member insertable into an interior of the induction cover and having a penetration hole formed therein for use in coupling the connection member to the induction cover, the upper and lower displacement measuring rods being successively inserted into the penetration holes; and a supporting plate positioned at a top of the induction cover and having an insertion rod for sealing top ends of the upper and lower displacement measuring rods. ### Claim 14 (depends on 13) The apparatus of claim 13, wherein said upper and lower displacement rods are hollow rods. ### Claim 15 (depends on 13) The apparatus of claim 13, wherein said induction cover is cylindrical in shape. ### Claim 16 A supporting force measuring method for use in an apparatus for measuring a supporting force of ferroconcrete piles installed at a scene by means of a bi-directional front end oil pressure loading apparatus using a high pressure loading system, said method comprising the steps of: forming a hole in a ground, said hole having a predetermined size and depth; installing the apparatus for measuring the supporting force in the hole; providing a tremie tube into which the bi-directional front end oil pressure loading apparatus is inserted; pouring concrete into the tremie tube, the concrete being poured into penetration holes via a tremie induction tube positioned at a lower end of the tremie tube; driving the bi-directional front end oil pressure loading apparatus so that a high oil pressure cylinder is inflated when the concrete is recuperated; measuring a displacement at upper and lower side faces of the bi-directional front end oil pressure loading apparatus using a displacement measuring rod after inflation of the high oil pressure cylinder, and measuring abrasion of the ground contacted by the concrete; and preparing a load distribution chart using the measured abrasion. ### Claim 17 (depends on 16) The method of claim 16, wherein the measuring step is carried out by using a load transition measuring instrument. ### Claim 18 A supporting force measuring method for use in an apparatus for measuring a supporting force of ferroconcrete piles installed at a scene by means of a bi-directional front end oil pressure loading apparatus using a high pressure loading system, said method comprising the steps of: (a) providing a load sensor coupled to upper and lower discs of the apparatus; (b) measuring values derived by the load sensor for each loading; (c) calculating a piles column face abrasion at a predetermined loading using the measured values from the load sensor; (d) deriving a distribution chart according to a depth; (e) calculating a size of the abrasion with respect to a same upward load as a sinking amount at a predetermined downward loading from the distribution chart; (f) successively calculating a total abrasion distribution chart by directionally converting abrasion distributions on the lower of the upper and lower discs after the abrasion distribution on the lower of the upper and lower discs with respect to the downward loading is combined with an abrasion distribution on the upper of the upper and lower discs with respect to an upward loading; (g) deriving an axis load distribution chart at a predetermined loading by addition of a component of a front end supporting force of piles derived in step (c); (h) repeatedly carrying out the steps (b) thru (g); and (i) completing derivation of the axis load distribution chart with regard to a representative loading step.