# US 5,699,783 A · Wire sawing method of reinforced concrete structure and guide pulley apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,699,783 A - Document ID: US5699783A - Status: Granted - Kind: A - Application number: 08/751,475 - Filed: 1996-11-18 - Granted: 1997-12-23 - Earliest claimed: 1993-12-30 - Assignees: Kabushiki Kaisha Dymosha - Inventors: Setsuo Kubo - Web page: https://patentgrep.com/patent/US5699783A ## CPC - B28D 1/088: {Sawing in situ, e.g. stones from rocks, grooves in walls} - B28D: WORKING STONE OR STONE-LIKE MATERIALS ## Abstract A wire method of a reinforced concrete structure, and a guide pulley apparatus for the method, wherein a cutting wire 18 guided by a pair of guide pulleys 7a, 7b disposed on the same plane as a scheduled cutting surface of a reinforced concrete structure 2 is caused to endlessly circulate and travel along the surface of the reinforced concrete structure under a regulated tension and at a regulated travelling speed through an auxiliary guide pulley 8c for separating one portion of the cutting wire from the other portion thereof. ## Claims ### Claim 1 A wire sawing method of a reinforced concrete structure, comprising the steps of: disposing a pair of main guide pulleys on the same plane as a scheduled cutting surface of a reinforced concrete structure; guiding a cutting wire through said pair of main guide pulleys such that said cutting wire winds around said reinforced concrete structure along said scheduled cutting surface and makes a circulating path via a wire driving pulley of a wire driving device; disposing an auxiliary guide pulley on a loosening side of said circulating path between said main guide pulleys and said wire driving pulley so as to widen said circulating path; and driving said cutting wire by said wire driving pulley under a regulated tension and at a regulated traveling speed. ### Claim 2 (depends on 1) The wire sawing method of a reinforced concrete structure according to claim 1, wherein a pair of said main guide pulleys comprise a first main guide pulley and a second main guide pulley, and said second main guide pulley commonly uses a tangent passing through a pulley groove of said first main guide pulley with said first main guide pulley and is disposed adjacent to said first main guide pulley. ### Claim 3 (depends on 2) The wire sawing method of a reinforced concrete structure according to claim 2, wherein a side guide pulley is disposed outside said first main guide pulley. ### Claim 4 (depends on 2) The wire sawing method of a reinforced concrete structure according to claim 2, wherein said second main guide pulley is disposed inside said first main guide pulley. ### Claim 5 (depends on 1) The wire sawing method of a reinforced concrete structure according to claim 1, wherein said cutting wire extending from said main guide pulleys to said wire driving device is disposed perpendicularly to the side surface of said reinforced concrete structure on which said cutting wire is to be wound. ### Claim 6 (depends on 5) The wire sawing method of a reinforced concrete structure according to claim 5, wherein side guide pulleys are disposed on both sides of said first main guide pulley. ### Claim 7 (depends on 5) The wire sawing method of a reinforced concrete structure according to claim 5, wherein both side guide pulleys are disposed on one of the sides of said first main guide pulley. ### Claim 8 (depends on 2) The wire sawing method of a reinforced concrete structure according to claim 2, wherein said first and second main guide pulleys are disposed in such a manner that their guide surfaces are positioned on the same plane as the side surface of said reinforced concrete structure, and side guide pulleys are disposed on one of the sides of said first and second main guide pulleys. ### Claim 9 (depends on 2) The wire sawing method of a reinforced concrete structure according to claim 2, wherein said first and second main guide pulleys are disposed on said reinforced concrete structure. ### Claim 10 (depends on 2) The wire sawing method of a reinforced concrete structure according to claim 2, wherein said second main guide pulley is disposed closer to said reinforced concrete structure than said first main guide pulley, and side guide pulleys are disposed on both sides of said first main guide pulleys. ### Claim 11 In a wire sawing apparatus wherein a pair of main guide pulleys are disposed on the same plane as a scheduled cutting surface of a reinforced concrete structure along the surface of said reinforced concrete structure and a cutting wire is wound on said reinforced concrete structure from outside at least one of said main guide pulleys to make a circulating path, said cutting wire being driven by a wire driving pulley of a wire driving device under a regulated tension and at a regulated traveling speed, a guide pulley apparatus for wire sawing characterized in that an auxiliary guide pulley is disposed on a loosening side of said circulating path between said main guide pulleys and said wire driving pulley so as to widen said circulating path of said cutting wire guided by the pair of said main guide pulleys. ### Claim 12 (depends on 11) The guide pulley apparatus for wire sawing according to claim 11, wherein the pair of said main guide pulleys comprise a first main guide pulley and a second main guide pulley, and said second main guide pulley commonly uses a tangent passing through a pulley groove of said first main guide pulley with said first main guide pulley and is disposed adjacent to said first main guide pulley. ### Claim 13 (depends on 12) The guide pulley apparatus for wire sawing according to claim 12, wherein a side guide pulley is disposed outside said first main guide pulley. ### Claim 14 (depends on 12) The guide pulley apparatus for wire sawing according to claim 12, wherein said second main guide pulley is disposed inside said first main guide pulley. ### Claim 15 (depends on 11) The guide pulley apparatus for wire sawing according to claim 11, wherein said cutting wire extending from said main guide pulleys to said wire driving device is disposed perpendicularly to the side surface of said reinforced concrete structure on which said cutting wire is to be wound. ### Claim 16 (depends on 15) The guide pulley apparatus for wire sawing according to claim 15, wherein side guide pulleys are disposed on both sides of said first main guide pulley. ### Claim 17 (depends on 15) The guide pulley apparatus for wire sawing according to claim 15, wherein both side guide pulleys are disposed on one of the sides of said first main guide pulley. ### Claim 18 (depends on 12) The guide pulley apparatus for wire sawing according to claim 12, wherein said first and second main guide pulleys are disposed in such a manner that their guide surfaces are positioned on the same plane as the side surface of said reinforced concrete structure, and side guide pulleys are disposed on one of the sides of said first and second main guide pulleys. ### Claim 19 (depends on 12) The guide pulley apparatus for wire sawing according to claim 12, wherein said first and second main guide pulleys are disposed on said reinforced concrete structure. ### Claim 20 (depends on 12) The guide pulley apparatus for wire sawing according to claim 12, wherein said second main guide pulley is disposed closer to said reinforced concrete structure than said first main guide pulley, and side guide pulleys are disposed on both sides of said first main guide pulley.