ESTIMATION METHOD FOR COMPRESSIVE STRENGTH OF ON-THE-SPOT PLACED CONCRETE AND SHIELD DRIVING METHOD

• Main Authors: KURITA MORIAKI, TANAKA HIROICHI
• Format: Patent
• Language: English
• Published: 08.10.1999
• Edition: 6
• Subjects: BUILDING; BUILDING IMPLEMENTS OR OTHER BUILDING AIDS, OR THEIRUSE; EARTH DRILLING; FIXED CONSTRUCTIONS; FORMS; GALLERIES; HANDLING BUILDING MATERIALS ON THE SITE; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; LARGE UNDERGROUND CHAMBERS; MEASURING; MINING; PHYSICS; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTINGBUILDINGS; SCAFFOLDING; SHAFTS; SHUTTERING; TESTING; TUNNELS

PROBLEM TO BE SOLVED: To obtain a method in which the compressive strength of covering concrete can be estimated precisely not in a system which collects a core sample but in a system which uses a test piece. SOLUTION: A shield driving method in which the primary covering of a tunnel is performed by on-the-spot placed concrete has a process S1 in which a temperature history in the hardening of covering concrete is measured is provided, a process S2 in which the concrete is cured so as to create the test piece of the concrete while the measured temperature history is being given and in which the compressive strength of the test piece is tested is provided, a process S3 in which the relationship between an integrated temperature and the compressive strength is found on the basis of a test result is provided, a process S4 in which a temperature history after placing the covering concrete is measured in its later execution so as to compute an integrated temperature is provided and a process S5 in which the compressive strength of the covering concrete being cured is estimated on the basis of the relationship between an integrated temperature found in advance by using the test piece and the compressive strength is provided.